Lincoln Electric IM724 User Manual

IM724

RETURN TO MAIN MENU

Safety Depends on You

Lincoln arc welding and cutting equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation ... and thoughtful operation on your part. DO

NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT WITHOUT READING THIS MANUAL AND THE SAFETY PRECAUTIONS CONTAINED THROUGHOUT. And, most

importantly, think before you act and be careful.

SP-135T

April, 2001

For use with machine Code Number:10867

Date of Purchase: Serial Number: Code Number: Model: Where Purchased:

ISO 9001

Designed and Manufactured Under a

Quality Program Certified by ABS Quality Evaluations, Inc.

to ISO 9001 Requirements.

CERTIFICATE NUMBER: 30273

Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

ANSI RAB

QMS

OPERATOR’S MANUAL

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

SAFETY

WARNING

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.

The Above For Diesel Engines

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH. KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box 351040, Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

The Above For Gasoline Engines

FOR ENGINE powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running.

____________________________________________________

1.b.Operate engines in open, well-ventilated areas or vent the engine exhaust fumes outdoors.

____________________________________________________

1.c. Do not add the fuel near an open flame

welding arc or when the engine is running. Stop the engine and allow it to cool before refueling to prevent spilled fuel from vaporizing on contact with hot engine parts and igniting. Do not spill fuel when filling tank. If fuel is spilled, wipe it up and do not start engine until fumes have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, coversand devices in position and in good repair.Keep hands, hair, clothing and tools away from V-belts, gears, fans and all other moving parts when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety

guards to perform required maintenance. Remove guards only when necessary and replace them when the maintenance requiring their removal is complete. Always use the greatest care when working near moving parts.

___________________________________________________

1.f. Do not put your hands near the engine fan. Do not attempt to override the governor or idler by pushing on the throttle control rods while the engine is running.

1.h. To avoid scalding, do not remove the radiator pressure cap when the engine is hot.

ELECTRIC AND MAGNETIC FIELDS may be dangerous

2.a. Electric current flowing through any conductor causes localized Electric and Magnetic Fields (EMF). Welding current creates EMF fields around welding cables and welding machines

2.b. EMF fields may interfere with some pacemakers, and welders having a pacemaker should consult their physician before welding.

2.c. Exposure to EMF fields in welding may have other health effects which are now not known.

2.d. All welders should use the following procedures in order to minimize exposure to EMF fields from the welding circuit:

2.d.1.

Route the electrode and work cables together - Secure them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right side, the work cable should also be on your right side.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while turning the engine or welding generator during maintenance work, disconnect the spark plug wires, distributor cap or magneto wire as appropriate.

2.d.4. Connect the work cable to the workpiece as close as possible to the area being welded.

2.d.5. Do not work next to welding power source.

Mar ‘95

SAFETY

ELECTRIC SHOCK can kill.

3.a. The electrode and work (or ground) circuits are electrically “hot” when the welder is on. Do not touch these “hot” parts with your bare skin or wet clothing. Wear dry, hole-free

gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation. Make certain the insulation is large enough to cover your full area of physical contact with work and ground.

In addition to the normal safety precautions, if welding must be performed under electrically hazardous conditions (in damp locations or while wearing wet clothing; on metal structures such as floors, gratings or scaffolds; when in cramped positions such as sitting, kneeling or lying, if there is a high risk of unavoidable or accidental contact with the workpiece or ground) use the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode, electrode reel, welding head, nozzle or semiautomatic welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical connection with the metal being welded. The connection should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical (earth) ground.

ARC RAYS can burn.

4.a. Use a shield with the proper filter and cover plates to protect your eyes from sparks and the rays of the arc when welding or observing open arc welding. Headshield and filter lens should conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistant material to protect your skin and that of your helpers from the arc rays.

4.c. Protect other nearby personnel with suitable, non-flammable screening and/or warn them not to watch the arc nor expose themselves to the arc rays or to hot spatter or metal.

FUMES AND GASES can be dangerous.

5.a. Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.When welding, keep your head out of the fume. Use enough ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

welding with electrodes which require special ventilation such as stainless or hard facing (see instructions on container or MSDS) or on lead or cadmium plated steel and other metals or coatings which produce highly toxic fumes, keep exposure as low as possible and below Threshold Limit Values (TLV) using local exhaust or mechanical ventilation. In confined spaces or in some circumstances, outdoors, a respirator may be required. Additional precautions are also required when welding on galvanized steel.

3.f.

Maintain the electrode holder, work clamp, welding cable and welding machine in good, safe operating condition. Replace damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts of electrode holders connected to two welders because voltage between the two can be the total of the open circuit voltage of both welders.

3.i. When working above floor level, use a safety belt to protect yourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

5.b.

Do not weld in locations near chlorinated hydrocarbon

coming from degreasing, cleaning or spraying operations. The heat and rays of the arc can react with solvent vapors form phosgene, a highly toxic gas, and other irritating products.

5.c. Shielding gases used for arc welding can displace air and

cause injury or death. Always use enough ventilation, especially in confined areas, to insure breathing air is safe.

5.d. Read and understand the manufacturer’s instructions for this

equipment and the consumables to be used, including the

material safety data sheet (MSDS) and follow your

employer’s safety practices. MSDS forms are available from

your welding distributor or from the manufacturer.

5.e. Also see item 1.b.

Mar ‘95

vapors

iii

SAFETY

iii

WELDING SPARKS can cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

the welding sparks from starting a fire.

materials from welding can easily go through small cracks and openings to adjacent areas. Avoid welding near hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site, special precautions should be used to prevent hazardous situations. Refer to “Safety in Welding and Cutting” (ANSI Standard Z49.1) and the operating information for the equipment being used.

6.c. When not welding, make certain no part of the electrode circuit is touching the work or ground. Accidental contact can cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the proper steps have been taken to insure that such procedures will not cause flammable or toxic vapors from substances inside. They can cause an explosion even been “cleaned”. For information, purchase “Recommended Safe Practices for the Containers and Piping That Have Held Hazardous Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or welding. They may explode.

Sparks and spatter are thrown from the welding arc. Wear oil

6.f. free protective garments such as leather gloves, heavy shirt, cuffless trousers, high shoes and a cap over your hair. Wear ear plugs when welding out of position or in confined places. Always wear safety glasses with side shields when in a welding area.

6.g. Connect the work cable to the work as close to the welding area as practical. Work cables connected to the building framework or other locations away from the welding area increase the possibility of the welding current passing through lifting chains, crane cables or other alternate circuits. This can create fire hazards or overheat lifting chains or cables until they fail.

6.h. Also see item 1.c.

Remember that welding sparks and hot

though

they have

Preparation

for Welding and Cutting of

CYLINDER may explode if damaged.

7.a. Use only compressed gas cylinders containing the correct shielding gas for the process used and properly operating regulators designed for the gas and

pressure used. All hoses, fittings, etc. should be suitable for the application and maintained in good condition.

7.b. Always keep cylinders in an upright position securely chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to

physical damage.

• A safe distance from arc welding or cutting operations and

any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand tight except when the cylinder is in use or connected for use.

7.g. Read and follow the instructions on compressed gas cylinders, associated equipment, and CGA publication P-l, “Precautions for Safe Handling of Compressed Gases in Cylinders,” available from the Compressed Gas Association 1235 Jefferson Davis Highway, Arlington, VA 22202.

FOR ELECTRICALLY powered equipment.

8.a. Turn off input power using the disconnect switch at the fuse box before working on the equipment.

8.b. Install equipment in accordance with the U.S. National Electrical Code, all local codes and the manufacturer’s recommendations.

8.c. Ground the equipment in accordance with the U.S. National Electrical Code and the manufacturer’s recommendations.

Mar ‘95

SAFETY

PRÉCAUTIONS DE SÛRETÉ

Pour votre propre protection lire et observer toutes les instructions et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté générales suivantes:

Sûreté Pour Soudage A L’Arc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode et à la piéce sont sous tension

quand la machine à souder est en marche. Eviter toujours tout contact entre les parties sous tension et la peau nue ou les vétements mouillés. Porter des gants secs et sans trous pour isoler les mains.

b. Faire trés attention de bien s’isoler de la masse quand on

soude dans des endroits humides, ou sur un plancher metallique ou des grilles metalliques, principalement dans

les positions assis ou couché pour lesquelles une grande partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble

de soudage et la machine à souder en bon et sûr état defonctionnement.

d.Ne jamais plonger le porte-électrode dans l’eau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

des porte-électrodes connectés à deux machines à souder parce que la tension entre les deux pinces peut être le total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de

courant pour soudage semi-automatique, ces precautions pour le porte-électrode s’applicuent aussi au pistolet de soudage.

5. Toujours porter des lunettes de sécurité dans la zone de soudage. Utiliser des lunettes avec écrans lateraux dans les zones où l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin de prévenir tout risque d’incendie dû aux étincelles.

7. Quand on ne soude pas, poser la pince à une endroit isolé de la masse. Un court-circuit accidental peut provoquer un échauffement et un risque d’incendie.

8. S’assurer que la masse est connectée le plus prés possible de la zone de travail qu’il est pratique de le faire. Si on place la masse sur la charpente de la construction ou d’autres endroits éloignés de la zone de travail, on augmente le risque de voir passer le courant de soudage par les chaines de levage, câbles de grue, ou autres circuits. Cela peut provoquer des risques d’incendie ou d’echauffement des chaines et des câbles jusqu’à ce qu’ils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage. Ceci est particuliérement important pour le soudage de tôles galvanisées plombées, ou cadmiées ou tout autre métal qui produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant d’opérations de dégraissage, nettoyage ou pistolage. La chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs du solvant pour produire du phosgéne (gas fortement toxique) ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté, voir le code “Code for safety in welding and cutting” CSA Standard W 117.2-1974.

2. Dans le cas de travail au dessus du niveau du sol, se protéger contre les chutes dans le cas ou on recoit un choc. Ne jamais enrouler le câble-électrode autour de n’importe quelle partie du corps.

3. Un coup d’arc peut être plus sévère qu’un coup de soliel, donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi qu’un verre blanc afin de se protéger les yeux du rayonnement de l’arc et des projections quand on soude ou quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de l‘arc.

c. Protéger l’autre personnel travaillant à proximité au

soudage à l’aide d’écrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de l’arc de soudage. Se protéger avec des vêtements de protection libres de l’huile, tels que les gants en cuir, chemise épaisse, pantalons sans revers, et chaussures montantes.

PRÉCAUTIONS DE SÛRETÉ POUR LES MACHINES À SOUDER À TRANSFORMATEUR ET À REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de l’électricité et aux recommendations du fabricant. Le dispositif de montage ou la piece à souder doit être branché à une bonne mise à la terre.

2. Autant que possible, I’installation et l’entretien du poste seront effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debrancher à l’interrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur place.

Mar. ‘93

for selecting a QUALITY product by Lincoln Electric. We want you

Thank You

to take pride in operating this Lincoln Electric Company product

••• as much pride as we have in bringing this product to you!

Please Examine Carton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims for material damaged in shipment must be made by the purchaser against the transportation company at the time the shipment is received.

Please record your equipment identification information below for future reference. This information can be found on your machine nameplate.

Model Name & Number _____________________________________

Code & Serial Number _____________________________________

Date of Purchase _____________________________________

Whenever you request replacement parts for or information on this equipment always supply the information you have recorded above.

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it

handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection. The level of seriousness to be applied to each is explained below:

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or loss of life.

CAUTION

This statement appears where the information must be followed to avoid minor personal injury or damage to this equipment.

MASTER TABLE OF CONTENTS FOR ALL SECTIONS

Page

Installation .......................................................................................................Section A

Technical Specifications ........................................................................................A-1

Identify and Locate Components...........................................................................A-2

Select Suitable Location ........................................................................................A-3

Output Connections...............................................................................................A-3

Input Connections..................................................................................................A-6

Code Requirements ..............................................................................................A-6

Operation .........................................................................................................Section B

Safety Precautions ................................................................................................B-1

General Description...............................................................................................B-1

Design Features ....................................................................................................B-1

Welding Capability.................................................................................................B-2

Limitations..............................................................................................................B-2

Controls and Settings ............................................................................................B-2

Welding Operations ...............................................................................................B-3

Overload Protection...............................................................................................B-6

Learning to Weld....................................................................................................B-7

Application Chart .................................................................................................B-18

Accessories.....................................................................................................Section C

Accessories ...........................................................................................................C-1

Replacement Parts................................................................................................C-2

Maintenance ....................................................................................................Section D

Safety Precautions ................................................................................................D-1

Items Requiring No Maintenance ..........................................................................D-1

Routine Maintenance.............................................................................................D-1

Gun and Cable Maintenance.................................................................................D-2

Component Replacement Procedures ..................................................................D-3

Changing Liner ......................................................................................................D-4

Gun Handle Parts..................................................................................................D-4

Troubleshooting..............................................................................................Section E

Safety Precautions.................................................................................................E-1

How to Use Troubleshooting Guide.......................................................................E-1

Troubleshooting Guide.........................................................................E-2 THRU E-4

Wiring Diagrams..............................................................................................Section F

SP-135T Wiring Diagram.......................................................................................F-1

Parts Lists .....................................................................................P396 Series, P202-E

A-1

INSTALLATION

TECHNICAL SPECIFICATIONS – SP-135T

INPUT – SINGLE PHASE ONLY

Standard Voltage/Frequency Input Current

120V/60Hz 20 Amps - Rated Output

RATED OUTPUT

Duty

Cycle Amps Volts at Rated Amperes

20% Duty Cycle 90 19

OUTPUT

Welding Current Range Maximum-Open Circuit Voltage 50 - 300 in/min

25-135 Amps 29V (1.3 - 7.6 m/min)

RECOMMENDED INPUT CABLE AND FUSE SIZES

Fuse or

Output Mode Input Voltage Breaker Size1Input Amps Power Cord Extension Cord

A-1

RATED 120V/60Hz 20 Amp 20 15 Amp, 125V,

Three Prong Plug Three Conductor

(NEMA Type 5-15P) #12 AWG

PHYSICAL DIMENSIONS

Height

12.0 in 9.75 in 16.5 in 48 Ibs 305 mm 248 mm 419 mm 21.8 kg

If connected to a circuit protected by fuses use Time Delay Fuse marked “D”.

Width Depth Weight

Three Conductor

#14 AWG

(2.1 mm

Up to 25 Ft. (7.6 mm)

(3.3 mm2) or Larger

Up to 50 Ft. (15.2 mm)

) or Larger

SP-135T

A-2

INSTALLATION

Read entire installation section before starting installation.

A-2

SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

• Only qualified personnel should perform this installation.

• Only personnel that have read and understood the SP-135T Operating Manual should install and operate this equipment.

• Machine must be plugged into a receptacle which is grounded per any national, local or other applicable electrical codes.

• The SP-135T power switch is to be in the OFF (“O”) position when installing work cable and gun and when connecting power cord to input power.

IDENTIFY AND LOCATE COMPONENTS

If you have not already done so, unpack the SP-135T from its carton and remove all packing material around the SP-135T. Remove the following loose items from the carton (see Figure A.1):

FIGURE A.1

1. SP-135T

2. Gun and cable assembly

(1)

3. Literature and miscellaneous including:

a) This operating manual

b) 6 extra .023"-.025” (0.6 mm) contact tips

c) Hex key wrench for removal of drive roll.

4. 10 ft (3.0 m) work cable.

5. Work clamp.

6. Sample spool of .025” (0.6 mm) L-56 MIG wire.

7. Handshield with filter plate and lens.

8. Adjustable mixed-Gas Regulator & Hose.

For available options and accessories refer to the Accessories Section of this manual.

As shipped from the factory, the SP-135T gun liner is ready to feed .023” (0.6 mm) -.035 (0.9 mm) wire. The contact tip is sized for .023”-.025” (0.6 mm) wire feeding.

SP-135T

A-3

SP-135T

DO NOT SWITCH WHEN WELDING

INSTALLATION

A-3

SELECT SUITABLE LOCATION

Locate the welder in a dry location where there is free circulation of clean air into the louvers in the back and out the front of the unit. A location that minimizes the amount of smoke and dirt drawn into the rear louvers reduces the chance of dirt accumulation that can block air passages and cause overheating.

STACKING

SP-135T’s cannot be stacked.

TILTING

Each machine must be placed on a secure, level surface, either directly or on either recommended cart. The machine may topple over if this procedure is not followed.

OUTPUT CONNECTIONS

Refer to Figure A.2.

1. Work Cable Access Hole.

2. Gun Cable and Control Lead Access Hole.

3. Connector Block.

4. Gun Trigger Lead Connectors.

5. Positive (+) and negative (–) output terminals.

6. Wire Feed Gearbox.

7. Cable Hanger.

8. Thumbscrew.

Work Clamp Installation

Attach the work clamp per the following:

1. Unplug the machine or turn the power switch to the “OFF” position.

2. Insert the work cable terminal lug with the larger hole through the strain relief hole in the work clamp as shown in Figure A-3.

3. Fasten securely with the bolt and nut provided.

FIGURE A.3

Strain Relief Hole

Work Cable

Work Clamp

Nut & Bolt

DO NOT SWITCH WHEN WELDING

FIGURE A.2

SP-135T

A-4

INSTALLATION

A-4

Work Cable Installation

Refer to Figure A.2.

1. Open the wire feed section door on the right side of the SP-135T.

2. Pass the end of the work cable that has the terminal lug with the smaller hole through the Work Cable Access Hole (1) in the case front.

3. Route the cable under and around the back of the Wire Feed Gearbox (6).

4. For GMAW Only: Refer to Figure A.2. As deliv- ered, the machine is connected for positive electrode polarity. This is the appropriate configuration for the GMAW (MIG) process. To complete installation, use the provided wing nut to connect the work cable’s terminal lug to the negative (–) output terminal (5) located above the Wire Feed Gearbox (6). Make sure that both wing nuts are tight.

5. For Innershield Only: Refer to Figure A.4. To wire for negative polarity (required for the Innershield process), connect the short cable attached to the connector block (1) to the negative (–) output terminal (2) and the work cable (3) to the positive (+) terminal (4).

Connecting Gun Cable to the SP-135T

1. Refer to Figure A.2. Unplug the machine or turn power switch to the OFF “O” position.

2. Pass the insulated terminals of the gun trigger control leads, one at a time, through the Gun Cable and Control Lead Access Slot (2) in the case front. The leads are to be routed under the Wire Feed Gearbox (6) and through the Cable Hanger (7) on the inner panel.

3. Insert the connector on the gun conductor cable through the Gun Cable Access Hole (2) in the SP135T case front. Make sure the connector is all the way in the brass connector block. Unscrew thumbscrew on the connector block a few turns if gun connector will not insert fully. Rotate the connector so control leads are on the underside and tighten the Thumbscrew (8) in the connector block.

4. Connect the gun trigger control lead terminals to the two insulated 1/4" (6.4 mm) tab terminal connector bushings located below the “Gun Trigger Connection” decal in the wire feed section (4). Either lead can go to either connector. Form the leads so that they are as close as possible to the inside panel.

CAUTION

If the gun trigger switch being used is other than that supplied with the SP-135T, the switch must be a normally open, momentary switch. The terminals of the switch must be insulated from the welding circuit. Malfunction of the SP-135T may result if this switch shorts to the SP-135T welding output circuit or is common to any electrical circuit other than the SP-135T trigger circuit.

FIGURE A.4

GAS CONNECTION

GUN INSTALLATION

As shipped from the factory, the SP-135T is ready to feed .023" – .025" (0.6 mm) solid wire. If .030" (0.8 mm) solid wire is to be used, change the contact tip to the appropriate size.

NOTE: If .035" (0.9 mm) Innershield flux-cored wire is to be used, the .035” Innershield Welding kit is required (see ACCESSORIES section).

When using the GMAW process, a cylinder of shielding gas, must be obtained. For more information about selecting gas cylinders for use with the SP-135T refer to the ACCESSORIES section.

SP-135T

A-5

INSTALLATION

A-5

WARNING

CYLINDER may explode if damaged. Keep cylinder upright and chained to support

• Keep cylinder away from areas where it may be damaged.

• Never lift welder with cylinder attached.

• Never allow welding electrode to touch cylinder.

• Keep cylinder away from welding or other live electrical circuits.

WARNING

BUILDUP OF SHIELDING GAS may harm health or kill.

• Shut off shielding gas supply when not in use.

• SEE AMERICAN NATIONAL STANDARD Z-49.1, “SAFETY IN WELDING AND CUTTING” PUBLISHED BY THE AMERICAN WELDING SOCIETY.

2. With the cylinder securely installed, remove the cylinder cap. Stand to one side away from the outlet and open the cylinder valve very slightly for an instant. This blows away any dust or dirt which may have accumulated in the valve outlet.

WARNING

BE SURE TO KEEP YOUR FACE AWAY FROM THE VALVE OUTLET WHEN “CRACKING” THE VALVE. Never stand directly in front of or behind the flow regulator when opening the cylinder valve. Always stand to one side.

3. Attach the flow regulator to the cylinder valve and tighten the union nut securely with a wrench.

NOTE: If connecting to 100% CO2cylinder, make certain the plastic washer is seated in the fitting that attaches to the CO2cylinder.

4. Refer to Figure A.6. Attach one end of inlet gas hose to the outlet fitting of the flow regulator and tighten the union nut securely with a wrench. Connect the other end to the SP-135T Gas Solenoid Inlet Fitting (5/8-18 female threads — for CGA — 032 fitting). Make certain the gas hose is not kinked or twisted.

1. Chain the cylinder to a wall or other stationary support to prevent the cylinder from falling over. Insulate the cylinder from the work circuit and earth ground. Refer to Figure A.5.

Flow Regulator

Gas Hose

FIGURE A.5

Cylinder Valve

SP-135T

A-6

INSTALLATION

A-6

INPUT CONNECTIONS

Refer to Figure A.6. The SP-135T has a power input cable located on the

rear of the machine.

GAS SOLENOID INLET FITTING

POWER INPUT CABLE

Requirements For Rated Output

A power cord with a 15 amp, 125 volt, three prong plug (NEMA Type 5-15P) is factory installed on the SP-135T. Connect this plug to a mating grounded receptacle which is connected to a 20 amp branch circuit with a nominal voltage rating of 115 to 125 volts, 60 Hertz, AC only.

The rated output with this installation is 90 amps,19 Volts, 20% duty cycle (2 minutes of every 10 minutes used for welding).

CAUTION

Do not connect the SP-135T to an input power supply with a rated voltage that is greater than 125 volts.

Do not remove the power cord ground prong.

FIGURE A.6

CODE REQUIREMENTS FOR INPUT CONNECTIONS

WARNING

This welding machine must be connected to a power source in accordance with applicable electrical codes.

The United States National Electrical Code (Article 630-B, 1990 Edition) provides standards for amperage handling capability of supply conductors based on duty cycle of the welding source.

If there is any question about the installation meeting applicable electrical code requirements, consult a qualified electrician.

SP-135T

B-1

OPERATION

B-1

Read entire operation section before operating the SP-135T.

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically live parts or electrode with skin or wet clothing. Insulate yourself from work and ground.

• Always wear dry insulating gloves.

FUMES AND GASES can be dangerous.

• Keep your head out of fumes.

• Use ventilation or exhaust to remove fumes from breathing zone.

WELDING SPARKS can cause fire or explosion.

• Keep flammable material away.

• Do not weld on closed containers.

GENERAL DESCRIPTION

The SP-135T is a complete semiautomatic constantvoltage DC wire feeder / power source arc welder. It has been designed for workshop, hobby, automotive and light maintenance. Included is a tap-switch controlled, single phase constant voltage transformer / rectifier power source and a wire feeder welding gun for feeding .023 - .025” (0.6 mm) through .030” (0.8 mm) solid steel electrode. An optional kit is available for feeding .035” (0.9 mm) Innershield®NR-211-MP flux-cored wire.

The SP-135T is ideally suited for individuals having access to 120 volt AC input power, and wanting the ease of use, quality and dependability of both gas metal arc welding or GMAW (also known as MIG welding) and the Innershield electrode process (self shielded flux cored or FCAW). The SP-135T is a rugged and reliable machine that has been designed for dependable service and long life.

RECOMMENDED PROCESSES

The SP-135T can be used for welding mild steel using the Gas Metal Arc Welding (GMAW or MIG, Metal Inert Gas) single pass process, which requires a supply of shielding gas, or the flux-cored arc welding (FCAW) process using Innershield®electrode wire. The SP-135T is configured for use with the GMAW process as delivered from the factory.

OPERATIONAL CONTROLS

ARC RAYS can burn eyes and skin.

• Wear eye, ear and body protection.

Observe all safety information throughout this manual.

The SP-135T has the following controls as standard: Control Power ON/OFF Switch, Voltage Control, Wire Speed Control, Trigger Switch, and a Circuit Breaker. With the optional Spot/Stitch Timer Kit installed, the following controls are also included: Mode switch and Time Control.

DESIGN FEATURES

● Operates on 120 volt input — no special wiring

required.

● “Cold electrode” until gun trigger is pressed for an

added measure of safety.

● Overload protection — incorporates both a thermo-

stat and a circuit breaker.

● Quality wire drive with electronic overload protec-

tion.

● “Quick Release” idle roll pressure arm is easily

adjusted.

● Reversible, dual groove drive roll. Drive roll will

feed .023 – .025” (0.6 mm) and .030" - .035" (0.8 -

0.9 mm) diameter wire.

SP-135T

B-2

OPERATION

B-2

● No external shielding gas is required when used

with Lincoln Innershield .035” (0.9 mm) NR®-211MP electrode.

● Accommodates both 4” (100 mm) diameter and 8”

(200 mm) diameter spools of wire.

● Accepts optional Spot/Stitch Timer Kit.

WELDING CAPABILITY

The SP-135T is rated at 90 amps, 19 volts, at 20% duty cycle on a ten minute basis. It is capable of higher output currents at lower duty cycles.

LIMITATIONS

Arc Gouging cannot be performed with the SP-135T. The SP-135T is not recommended for pipe thawing or TIG welding.

CONTROLS AND SETTINGS

Refer to Figure B.1a.

1. Control Power ON/OFF Switch — When the power is on the fan motor will run and air will be exhausted out the louvers in the front of the machine. The welding output and wire feeder remain off until the gun trigger is pressed.

OFF

5. Gun Trigger - Activates welding output, wire feed, and gas solenoid operation. Releasing the trigger deactivates welding and simultaneously activates the “burnback” function so that the welding wire does not stick in the weld puddle.

6. Optional K695-1 Spot/ Stitch Timer Kit Controls (see ACCESSORIES section) - If present, replaces Blank Panel Assembly located on the center panel inside the case door:

Mode Switch - Selects between Spot, Stitch, or Seam (normal welding) mode. Spot mode welds for an adjustable length of time (set by Time Control; see below) and then stops, whenever the gun trigger is depressed and held. Stitch mode cycles between welding and not welding for an adjustable length of time (also set by Time Control) while the gun trigger is depressed. In Seam mode the machine will weld continuously while the gun trigger is depressed. Releasing the gun trigger in any of the three modes will interrupt welding immediately.

Time Control - In Spot mode, controls spot mode ON time between approximately .25 and 4.0 seconds. In Stitch mode, controls stitch mode ON time and OFF time simultaneously between .25 and 4.0 seconds each. This control is deactivated while in Seam mode.

2. Wire Speed Control — Controls the wire feed speed from 50 – 300 in /min (1.3 –

7.6 m/min). The control can be preset on the dial to the setting specified on the SP135T Application Chart located on the inside of the wire feed section door.

3. Voltage Control — A 4-position tap selector switch gives full range adjustment of power source output voltage. Do not switch while welding.

4. Circuit Breaker – Protects machine from damage if maximum output is exceeded. Button will extend out when tripped (Manual reset)

WIRE SPEED

ARC VOLTS

Refer to Figure B.1b

SP-135T

B-3

SP-135T

DO NOT SWITCH WHEN WELDING

OPERATION

B-3

Note:When loading and removing the 8” Spools

make sure that the wing nut (inside the wire spool spindle hub) is turned 90° from the wire spool spindle locking tab. If the wing nut is positioned in line with the locking tab, the tab cannot be depressed to load or unload the wire spool.

FIGURE B.2

Wire Spool Spindle

FIGURE B.1a

Be sure that this stud engages the hole in the wire spool.

To Wire Drive

Wire Spool must be pushed all the way on the spindle so that the spindle’s tab will hold it in place. The Wire Spool will rotate clockwise when wire is dereeled.

Load an 8” (200 mm) diameter spool on the wire spool

8” Wire Spool

spindle shown in Figure B.2.

FIGURE B.1b

WELDING OPERATIONS

SEQUENCE OF OPERATION

Wire Loading

Refer to Figures B.2 and B.3. The machine power switch should be turned to the

OFF (“O”) position before working inside the wire feed enclosure.

The welder is shipped from the factory ready to feed 8" (200 mm) diameter spools with 2.2" (56 mm) maximum width. These spools fit on a 2" (51 mm) diameter spindle that has a built in, adjustable friction brake to prevent overrun of the spool and excess slack in the wire.

To use 4” (100 mm) diameter spools, the 2” (50 mm) diameter spindle must be removed (See Figure B.3). Remove the wing nut and spacer at the end of the shaft and remove the outside plastic wire spool spindle. The spindle can be stored in the wire feed compartment. A 4” (100 mm) diameter spool is mounted directly on the 5/8” (16 mm) diameter shaft and held in place with the previously removed hardware. Also make certain the start end of the wire, which may protrude through the side of the spool does not contact any metallic case parts.

FIGURE B.3

Wire Spindle Shaft

To Wire Drive

4" Wire Spool

Wing Nut and Spacer

SP-135T

B-4

Friction Brake Adjustment

With wire spool installed on the spindle shaft and the wing nut loose, turn the spool by hand while slowly tightening the wing nut until a light drag is felt. Tighten the wing nut an additional 1/4 turn.

Note: When properly adjusted, the brake should provide only enough drag to prevent overrun of the spool and excess slack in the wire. Too much drag may result in wire feeding problems, and may cause premature wear of wire drive system components.

Wire Threading

Refer to Figure B.4

1. Release the Spring Loaded Pressure Arm (1) rotate the Idle Roll Arm (2) away from. the Wire Feed Drive Roll (3). Ensure that the groove size in the feeding position on the drive roll matches the wire size being used.

OPERATION

B-4

7. Refer to Figure B.5. Remove gas nozzle and contact tip from end of gun.

The Wire Drive Feed Roll can accommodate two wire sizes by flipping the wire drive feed roll over.

FIGURE B.4

2. Carefully detach the end of the wire from the spool. To prevent the spool from unwinding, maintain tension on the wire until after step 5.

3. Cut the bent portion of wire off and straighten the

first 4” (100 mm).

4. Thread the wire through the In-going guide tube (4), over the drive roll (3), and into the out-going guide tube (5).

5. Close the idle roll arm (2) and latch the spring loaded pressure arm (1) in place. Rotate the spool counterclockwise if required in order to take up extra slack in the wire.

6. The idle roll pressure adjustment wing nut is factory set to approximately five full turns from where the wing nut first engages the threads of the pressure arm (1). If feeding problems occur because the wire is flattened excessively, turn the pressure adjustment counter-clockwise to reduce distortion of the wire. Slightly less pressure may be required when using 0.023 – 0.025" (0,6 mm) wire. If the drive roll slips while feeding wire, the pressure should be increased until the wire feeds properly.

8. Turn the SP-135T ON (“I”).

9. Straighten the gun cable assembly.

10. Depress the gun trigger switch and feed welding wire through the gun and cable. (Point gun away from yourself and others while feeding wire.) Release gun trigger after wire appears at end of gun.

11. Turn the SP-135T OFF (“O”).

12. Replace contact tip and gas nozzle.

13. Refer to Figure B-6. Cut the wire off 1/4”– 3/8” (6 – 10 mm) from the end of the tip. The SP-135T is now ready to weld.

Gun Handle

Gas Diffuser/ Contact Tip

WARNING

When inching the welding wire, the drive rolls, the gun connector block and the gun contact tip are electrically energized relative to work and ground and remain energized for several seconds after the gun trigger is released.

Gas Nozzle

FIGURE B.5

SP-135T

B-5

Contact Tip

OPERATION

6. Refer to Figure B.7. Connect work clamp to metal to be welded. Work clamp must make good electrical contact to the workpiece. The workpiece must also be grounded as stated in “Arc Welding Safety Precautions” in the beginning of this manual.

B-5

Wire Electrode

3/8" – 1/2" Electrical Stickout

FIGURE B.6

Making A Weld

1. See “Process Guidelines” in this section for selection of welding wire and shielding gas and for range of metal thicknesses that can be welded.

2. See the Application chart on the inside of the wire feed compartment door for information on setting the SP-135T controls. Refer to Table B.1 for aluminum and stainless wire.

3. Set the Voltage (“V”) and Wire Speed (“olo’”) controls to the settings suggested for the welding wire and base metal thickness being used, refer to Applications chart on the inside of the wire drive compartment door.

4. Check that the polarity is correct for the welding wire being used and that the gas supply, if required, is turned on.

7. Position gun over joint. End of wire may be lightly touching the work.

8. Lower welding helmet, close gun trigger, and begin welding. Hold the gun so the contact tip to work distance is about 3/8 inch (10 mm).

9. To stop welding, release the gun trigger and then pull the gun away from the work after the arc goes out.

10. When no more welding is to be done, close valve on gas cylinder (if used), momentarily operate gun trigger to release gas pressure, and turn off the SP-135T.

Cleaning Tip And Nozzle

Clean the contact tip and nozzle to avoid arc bridging between the nozzle and contact tip which can result in a shorted nozzle, poor welds and an overheated gun. Hint: Anti-stick spray or gel, available from a welding supply distributor, may reduce buildup and aid in spatter removal.

PROCESS GUIDELINES

5. When using Innershield electrode, remove the gas nozzle and install the gasless nozzle. This will improve visibility of the arc and protect the gas diffuser from weld spatter. Refer to the MAINTENANCE section for details on nozzle replacement.

GUN CABLE

WORKPIECE

ARC

WORK CLAMP

FIGURE B.7

SP-135T

The SP-135T can be used for welding mild steel using the GMAW, single pass, process which requires a supply of shielding gas or it can be used for the selfshielded, Innershield®process (FCAW).

The recommended gases and electrodes for GMAW are welding grade CO2gas or an argon-CO2blended gas (75 to 80% argon and 25 to 20% CO2) and .025" (0.6 mm) diameter Lincoln L-56 mild-steel welding wire, supplied on 12-1/2 lb (5.7 kg) spools. The blended gas is recommended for welding on heavier steel, 14 gauge (2.0 mm), for example.

The recommended electrode for the self-shielded process is .035” (0.9 mm) diameter Lincoln Innershield®NR-211-MP on 10 lb (4.5 kg) spools. This electrode can be used for all position welding of 20 gauge (1.0 mm) through 5/16" (8 mm) steel. Thickness of 1/4" (6 mm) and 5/16" (8 mm) require multiple passes. This wire can also be used for the welding of galvanized coated sheet metal.

B-6

OPERATION

B-6

The SP-135T is suitable for .035" aluminum wire and .030" stainless wire. Refer to Table B.1 for recommended procedure settings (requires K499 Argon Regulator Kit).

TABLE B.1

Process Welding Wire Gas 16 ga 14 ga 12 ga 10 ga

Shielding

MIG DC+ .035 Dia 100% Argon B-5 D-7 D-9 D-9

4043 Aluminum Wire

MIG DC+ .035 Dia 100% Argon B-5 C-7 D-9 D-10

5356 Aluminum Wire

MIG DC+ .030 Dia 98% Argon/ A-3 C-6 D-7.5 D-7.5

308L Stainless 2% Oxygen Steel Wire

Voltage/Wire Speed

CHANGING MACHINE OVER TO FEED OTHER WIRE SIZES

The SP-135T is shipped from the factory ready to feed .023”-.025” (0.6 mm) diameter wire. To operate the SP-135T with other sizes of wire, it is necessary to change the contact tip and change the drive roll over to other sizes. Refer to Changing the Contact Tip and Changing the Drive Roll, in the MAINTENANCE section, for specific information on these procedures.

2. If using a regulator with an adjustable flow meter, close the gun trigger and adjust the flow to give 15

– 20 cubic ft per hour (CFH) (7 – 10 I/min) [use 20 – 25 CFH (10 – 12 I/min) when welding out of

position or in a drafty location for CO2]. For argon mixed gas, trigger to release gas pressure, and adjust the flow to give 25 – 30 CFH (12 – 14 I/min).

3. Keep the cylinder valve closed, except when using the SP-135T. When finished welding:

a) Close the cylinder valve to stop gas flow. b) Depress the gun trigger briefly to release the

pressure in the gas hose.

c) Turn off the SP-135T.

WELDING WITH FCAW (Innershield)

When using the FCAW process, the correct drive roll and electrode polarity must be used. See Work Cable Installation in INSTALLATION section for changing the polarity.

Innershield welding kit K549-1 (for .035" / 0.9mm) is also available.

OVERLOAD PROTECTION

WELDING WITH GMAW (MIG)

Shielding Gas

When using the GMAW process, obtain and install a gas regulator and hose kit; K463 (for CO2) or K499 (Argon mixed) gas regulator and hose kit.

1. For CO2, open the cylinder very slowly. For argonmixed gas, open cylinder valve slowly a fraction of a turn. When the cylinder pressure gauge pointer stops moving, open the valve fully.

Output Overload

The SP-135T is equipped with a circuit breaker and a thermostat which protects the machine from damage if maximum output is exceeded. The circuit breaker button will extend out when tripped. The circuit breaker must be manually reset.

Thermal Protection

The SP-135T has a rated output duty cycle of 20%. If the duty cycle is exceeded, a thermal protector will shut off the output until the machine cools to a reasonable operating temperature. This is an automatic function of the SP-135T and does not require user intervention. The fan continues to run during cooling.

Electronic Wire Drive Motor Protection

The SP-135T has built-in protection for wire drive motor overload.

SP-135T

B-7

LEARNING TO WELD

B-7

LEARNING TO WELD

No one can learn to weld simply by reading about it. Skill comes only with practice. The following pages will help the inexperienced operator to understand welding and develop this skill. For more detailed information, order a copy of “New Lessons in Arc Welding” listed at the end of this manual.

THE ARC-WELDING CIRCUIT

The operator’s knowledge of arc welding must go beyond the arc itself. The operator must know how to control the arc, and this requires a knowledge of the welding circuit and the equipment that provides the electric current used in the arc. Figure B.7 illustrates the welding circuit for a typical welding machine. The circuit begins where the gun cable is attached to the welding machine. Current flows through the gun cable, gun, and contact tip, to the wire and across the arc. On the work side of the arc, current flows through the base metal to the work cable and back to the welding machine. This circuit must be complete for the current to flow.

This machine’s welding circuit has a voltage output of 32 volts DC maximum. This voltage is quite low and is only present when the gun triggers depressed.

To weld, the work clamp must be tightly connected to clean base metal. Remove paint, rust, dirt or oil as necessary and connect the work clamp as close as possible to the area you wish to weld. This helps prevent current from going through an unwanted path. Avoid allowing the welding circuit to pass through hinges, bearings, electronic components, or similar devices that can be damaged. See Figure B.8. Always disconnect electrical devices before welding upon them.

WARNING

Fumes and slag generated from Innershield type electrodes recommended for use with this welding machine can be toxic.

• Avoid contact with eyes and skin.

• Do not take internally.

• Keep out of reach of children.

• Follow all safety precautions found in this operating manual.

The gun and cable assembly is held by the operator who guides the automatically fed wire along the joint, maintaining a contact tip to work distance of about 3/8 to 1/2 inch (10 – 12 mm) This is called electrical stickout. This electrical stickout (ESO) must be properly maintained by the operator. The electric arc is made in the gap between the work and the tip end of a small diameter wire. When the power source is properly set, the arc gap is maintained automatically.

Arc welding is a manual skill requiring a steady hand, good physical condition, and good eyesight. The operator controls the welding arc, and, therefore, the quality of the weld made.

THE SELF-SHIELDED FCAW WELDING ARC

Figure B.9 illustrates the action taking place in the self shielded FCAW (Innershield) welding arc. It closely resembles what is actually seen while welding.

Hinges

FIGURE B.8

Electronic Components

Bearings

SP-135T

Protective Slag

Weld Metal

Cored Wire

Burning of core materials inside wire electrode results in shield of gas.

Arc Stream

FIGURE B.9

B-8

LEARNING TO WELD

B-8

The “arc stream” is seen in the middle of the picture. This is the electric arc created by the electric current flowing through the space between the end of the wire electrode and the base metal. The temperature of this arc is about 6000°F, which is more than enough to melt metal. The arc is very bright, as well as hot, and cannot be looked at with the naked eye without risking painful injury. The very dark lens, specifically designed for arc welding must be used with the hand or face shield whenever viewing the arc.

The arc melts the base metal and actually digs into it much as water through a nozzle on a garden hose digs into the earth. The molten metal forms a molten pool or crater and tends to flow away from the arc. As it moves away from the arc, it cools and solidifies.

The function of the Innershield cored wire electrode is much more than simply to carry current to the arc. The wire core is composed of fluxes and/or alloying ingredients around which a steel sheath has been formed. It is simply a stick electrode turned inside out in a continuous wire form.

The cored wire melts in the arc and tiny droplets of molten metal shoot across the arc into the molten pool. The wire sheath provides additional filler metal for the joint to fill the groove or gap between the two pieces of base metal.

The core materials also melt or burn in the arc and perform several functions. They make the arc steadier, provide a shield of smoke-like gas around the arc to keep oxygen and nitrogen in the air away from the molten metal, and provide a flux for the molten pool. The flux picks up impurities and forms the protective slag on top of the weld during cooling.

After running a weld bead, the slag may be removed with a chipping hammer and wire brush. This improves appearance and allows for inspection of the finished weld.

THE GMAW (MIG) WELDING ARC

Figure B.10 illustrates the GMAW (MIG) welding arc. Solid wire does not contain fluxes or ingredients to form its own shielding and no slag forms to protect the molten weld metal. For this reason, a continuous even flow of shielding gas is needed to protect the molten weld metal from atmospheric contaminants such as oxygen and nitrogen. Shielding gas is supplied through the gun and cable assembly, through the gas nozzle and into the welding zone.

Gas nozzle Shielding gasSolid wire

electrode

Weld metal

Base metal

FIGURE B.10

When comparing the GMAW and FCAW processes, you can see that the principal difference between the two lies in the type of shielding used. GMAW uses gas for shielding, thus we have Gas Metal Arc Welding. FCAW uses the melting or burning of the core ingredients for shielding, and is thus termed Self-Shielded Flux Cored Arc Welding.

The recommended wire for Gas Metal Arc Welding (MIG) is Lincolnweld 0.025” (0.6 mm) L-56 electrode. Lincolnweld” L-56 is capable of welding a wide range of mild steels in all positions, however, more skill IS required for out-of-position welding with the GMAW process.

Since machine size and output characteristics limit the size and type of wire electrode which can be used, Lincoln 0.035’ (0.9 mm) NR-211-MP Innershield electrode is recommended for Self-Shielded Flux Cored Arc Welding.

SP-135T

PROCESS SELECTION

By gaining knowledge of the differences between the two processes, you will be able to select the best process for the job you have at hand. In selecting a process, you should consider:

B-9

LEARNING TO WELD

B-9

For GMAW (MIG) Process

1. Is most of my welding performed on 16 gauge and lighter materials?

2. Can I afford the extra expense, space, and lack of portability required for gas cylinders and gas supply?

3. Do I require clean, finished-looking welds?

If you have answered yes to all the above questions GMAW may be the process for you. If you have answered no to any of the above questions, then you should consider using the FCAW process.

For FCAW (Innershield) Process

1. Do I want simplicity and portability?

2. Will welding be performed outdoors or under windy conditions?

3. Do I require good all position welding capability?

4. Will most welding be performed on 16 gauge and heavier, somewhat rusty or dirty materials?

JOINT TYPES AND POSITIONS

Five types of welding joints are: Butt Welds, Fillet Welds, Lap Welds, Edge Welds and Corner Welds. See Figure B.11.

Of these, the Butt Weld and Fillet Weld are the two most common welds.

Butt weld Lap weld

Edge weld Fillet weld Corner weld

FIGURE B.11

5. Weld must be cleaned prior to painting.

COMMON METALS

Most metals found around the farm, small shop or home are low carbon steel, sometimes referred to as mild steel. Typical items made with this type of steel include most sheet metal, plate, pipe and rolled shapes such as channels and angle irons. This type of steel can usually be easily welded without special precautions. Some steels, however, contain higher carbon levels or other alloys and are more difficult to weld. Basically, if a magnet sticks to the metal and you can easily cut the metal with a file, chances are good that the metal is mild steel and that you will be able to weld the material. In addition, aluminum and stainless steel can be welded using the K664-1 Aluminum Welding Kit. For further information on identifying various types of steels and other metals, and for proper procedures for welding them, we again suggest you purchase a copy of “New Lessons in Arc Welding”.

Regardless of the type of metal being welded, in order to get a quality weld, it is important that the metal is free of oil, paint, rust or other contaminants.

Butt Welds

Place two plates side by side, leaving a space approximately one half the thickness of the metal between them in order to get deeper penetration.

Securely clamp or tack weld the plates at both ends, otherwise the heat will cause the plates to move apart. See Figure B.12.

Now weld the two plates together. Weld from left to right (if right handed). Point the wire electrode down in the crack between the two plates, keeping the gun slightly tilted in the direction of travel. Watch the molten metal to be sure it distributes itself evenly on both edges and in between the plates. This is referred to as the “pull technique”. On thin gauge sheet metal, use the “push technique”. See “Welding Techniques for GMAW (MIG) Process”.

SP-135T

B-10

LEARNING TO WELD

B-10

45°

FIGURE B.12

Penetration

Unless a weld penetrates close to 100% of the metal thickness, a butt weld will be weaker than the material welded together. In the example shown in Figure B.13, the total weld is only half the thickness of the material thus the weld is only approximately half as strong as the metal.

FIGURE B.13

FIGURE B.15

Welding In The Vertical Position

Welding in the vertical position can be done either vertical-up or vertical-down. Vertical-up is used whenever a larger, stronger weld is desired. Vertical-down is used primarily on sheet metal 5/32” (3.9 mm) and under for fast, low penetrating welds.

WARNING

Use of this unit on thicker materials than recommended may result in poor welds. The welds may “look” good, but may just be “sitting” on top, of the plate. This is called “Cold Casting” and will result in weld failure.

Vertical-up And Overhead Welding

The problem, when welding vertical-up, is to put the molten metal where it is wanted and make it stay there. If too much molten metal is deposited, gravity will pull it downwards and make it “drip”. Therefore, a certain technique has to be followed.

FIGURE B.14

In the example shown in Figure B.14, the joint has been welded so that 100% penetration could be achieved. The weld, if properly made, is as strong as or stronger than the original metal.

Fillet Welds

When welding fillet welds, it is very important to hold the wire electrode at a 45° angle between the two sides or the metal will not distribute itself evenly. The gun nozzle is generally formed at an angle to facilitate this. See Figure B.15.

SP-135T

When welding out-of-position, run stringer beads. Don’t whip, break the arc, move out of the puddle, or move too fast in any direction. Use Wire Feed Speed (WFS) in the low portion of the range. The general technique and proper gun angle is illustrated in Figure B.16.

Generally, keep the electrode nearly perpendicular to the joint as illustrated. The maximum angle above perpendicular may be required if porosity becomes a problem.

B-11

PROPER GUN ANGLE FOR GMAW PROCESS WELDING IN THE VERTICAL UP POSITION

PROPER GUN ANGLE FOR FCAW PROCESS WELDING IN THE VERTICAL UP POSITION

LEARNING TO WELD

FIGURE B.16

Vertical-down Welding

Refer to Figure B.17 Vertical-down welds are applied at a fast pace. These welds are therefore shallow and narrow and, as such, are excellent for sheet metal. Vertical-down welds may be applied to 5/32” (3.9 mm) and lighter material.

Use stringer beads and tip the gun in the direction of travel so the arc force helps hold the molten metal in the joint. Move as fast as possible consistent with desired bead shape.

B-11

MACHINE SET UP FOR THE SELF-SHIELDED FCAW PROCESS

1. See PROCESS GUIDELINES in the OPERATION section for selection of welding wire and shielding gas, and for range of metal thicknesses that can be welded.

2. See the Application Guide on the inside of wire feed section door for information on setting the controls.

3. Set the “Voltage” and “Wire Speed” controls to the settings suggested on the Application Guide for the welding wire and base metal thickness being used. The voltage control is marked “V” and the wire feed speed is marked ‘’olo.’’

4. Check that the polarity is correct for the welding wire being used. Set the polarity for DC(–) when welding with NR-211-MP Innershield electrode. See Work Cable Installation in the INSTALLATION section for instructions on changing polarity.

5. When using Innershield electrode, the gasless nozzle may be used instead of a gas nozzle to improve visibility of the arc.

The important thing is to continue lowering the entire arm as the weld is made so the angle of the gun does not change. Move the electrode wire fast enough that the slag does not catch up with the arc. Vertical-down welding gives thin, shallow welds. It should not be used on heavy material where large welds are required.

FIGURE B.17

6. Connect work clamp to metal to be welded. Work clamp must make good electrical contact to the work piece. The work piece must also be grounded as stated in the “Arc Welding Safety Precautions” at the beginning of this manual.

WELDING TECHNIQUES FOR THE SELFSHIELDED FCAW PROCESS

Four simple manipulations are of prime importance when welding. With complete mastery of the four, welding will be easy. They are as follows:

1. The Correct Welding Position

Figure B.18 illustrates the correct welding position for right handed people. (For left handed people, it is the opposite.)

Hold the gun (of the gun and cable assembly) in your right hand and hold the shield with your left hand. (Left handers simply do the opposite.)

When using the FCAW Process, weld from left to right (if you are right handed). This enables you to clearly see what you are doing. (Left handers do the opposite.) Tilt the gun toward the direction of travel holding the electrode at an angle as shown in Figure B.18.

SP-135T

B-12

FIGURE B.18

WARNING

LEARNING TO WELD

Contact Tip

Wire Electrode

B-12

3/8 – 1/2” (10 – 12 mm) Electrical Stickout (ESO)

ARC RAYS can burn eyes and skin.

When using an open arc process, it Is necessary to use correct eye, head and body protection.

Protect yourself and others, read “ARC RAYS can burn” at the front of this manual.

2. The Correct Way To Strike An Arc

1. Be sure the work clamp makes good electrical contact to the work.

2. Position gun over joint. End of wire may be lightly touching the work.

3. Position face shield to protect face and eyes, close gun trigger, and begin welding. Hold the gun so that the contact tip to work distance is about 3/8 to 1/2 inch (10 – 12 mm).

4. To stop welding, release the gun trigger and the pull the gun away from the work after the arc goes out.

FIGURE B.19

The easiest way to tell whether the ESO is the correct length is by listening to its sound. The correct ESO has a distinctive “crackling” sound, very much like eggs frying in a pan. A long ESO has a hollow, blowing or hissing sound. If the ESO is too short, you may stick the contact tip or nozzle to the weld puddle and/or fuse the wire to the contact tip.

4. The Correct Welding Speed

The important thing to watch while welding is the puddle of molten metal right behind the arc. See Figure B.20. Do not watch the arc itself. It is the appearance of the puddle and the ridge where the molten puddle solidifies that indicates correct welding speed. The ridge should be approximately 3/8” (10 mm) behind the wire electrode.

Most beginners tend to weld too fast, resulting in a thin uneven, “wormy” looking bead. They are not watching the molten metal.

5. A ball may form at the tip end of the wire after welding. For easier restrikes (with Innershield wire) the ball may be removed by feeding out a few inches of wire and simply bending the wire back and forth until it breaks off.

6. When no more welding is to be done, turn off the machine.

3. The Correct Electrical Stickout (ESO)

The electrical stickout (ESO) is the distance from the end of the contact tip to the end of the wire.

See Figure B.19. Once the arc has been established, maintaining

the correct ESO becomes extremely important. The ESO should be approximately 3/8 to 1/2 inch (10 to 12 mm) long.

Solidifying ridge

Molten puddle

FIGURE B.20

SP-135T

B-13

LEARNING TO WELD

B-13

Helpful Hints

1. For general welding, it is not necessary to weave the arc, neither forward or backward nor sideways. Weld along at a steady pace. You will find it easier.

2. When welding on thin plate, you will find that you will have to increase the welding speed, whereas when welding on heavy plate, it is necessary to go more slowly in order to get good penetration.

3. When welding sheet metal 16 gauge (1.5 mm) and lighter, heat buildup may cause part warpage and burn through. One way to eliminate these problems is to use the back-stepping method illustrated in Figure B.21.

First weld from A to B; then from C to A; then from D to C; then from E to D, and so on.

BACDE

Back-Stepping

FIGURE B.21

Practice

The best way of getting practice in the four skills that enable you to maintain:

1. Correct welding position

2. Correct way to strike an arc

3. Correct electrical stickout

4. Correct welding speed

For the SP-135T, use the following:

Mild Steel 12 gauge or 1/8 inch

(3.0 mm)

Electrode 0.035" (0.9 mm)

NR-211-MP

Innershield Wire

Voltage Setting “V” D Wire Feed Speed “o|o” 3

Refer to Figure B.22.

1. Learn to strike an arc by positioning the gun over the joint and touching the wire to the work.

2. Position face shield to protect face and eyes.

3. Depress gun trigger, hold gun so contact tip to work distance is about 3/8 to 1/2 inch (10 to 12 mm) and the gun is at proper angle.

4. After you strike the arc, practice the correct electrical stickout. Learn to distinguish it by its sound.

5. When you are sure that you can hold the correct electrical stickout, with a smooth “crackling” arc start moving. Look at the molten puddle constantly, and look at the “ridge” where the metal solidifies.

6. Run beads on a flat plate. Run them parallel to the top edge (the edge farthest away from you). This gives you practice in running straight welds, and also gives you an easy way to check your progress. The 10th weld will look considerably better than the first weld. By constantly checking on your mistakes and your progress, welding will soon be a matter of routine.

is to perform the following exercise.

Contact Tip

ESO

Gun Angle

FIGURE B.22

SP-135T

B-14

LEARNING TO WELD

MACHINE SET UP FOR THE GMAW (MIG) PROCESS

1. See PROCESS GUIDELINES in the OPERATION section for selection of welding wire and shielding gas, and for range of metal thicknesses that can be welded.

B-14

2. See the Application Guide on the inside of wire feed section door for information on setting the controls.

4. Check that the polarity is correct for the welding wire being used. Set the polarity for DC(+) when welding with the GMAW (MIG) process. See Work Cable Installation in the INSTALLATION section for instructions for changing polarity.

5. Check that the gas nozzle and proper size liner and contact tip are being used and that the gas supply is turned on. If adjustable, set for 15 to 20 cubic feet per hour (7 to 10 l/min.) under normal conditions, increase to as high as 35 CFH (17 I/min.) under drafty (slightly windy) conditions.

FIGURE B.23

When using the GMAW process on light gauge material, weld from right to left (if you are right handed). This results in a colder weld and has less tendency for burn through.

2. The Correct Way To Strike An Arc

WARNING

ARC RAYS can burn eyes and skin.

When using an open arc process, it Is necessary to use correct eye, head and body protection.

Protect yourself and others, read “ARC RAYS can burn” at the front of this manual.

1. Be sure the work clamp makes good electrical contact to the work.

2. Position gun over joint. End of wire may be lightly touching the work.

WELDING TECHNIQUES FOR THE GMAW (MIG) PROCESS

Four simple manipulations are of prime importance when welding. With complete mastery of the four, welding will be easy. They are as follows:

1. The Correct Welding Position

Figure B.23 illustrates the correct welding position for right handed people. (For left handed people, it is the opposite.)

When GMAW (MIG) welding on sheet metal, it is important to use the “forehand” push technique.

Hold the gun (of the gun and cable assembly) in your right hand and hold the shield with your left hand. (Left handers simply do the opposite.)

SP-135T

3. Position face shield to protect face and eyes, close gun trigger, and begin welding. Hold the gun so that the contact tip to work distance is about 3/8 to 1/2 inch (10 – 12 mm).

4. To stop welding, release the gun trigger and pull the gun away from the work after the arc goes out.

5. A ball may form at the tip end of the wire after welding. For easier restrikes, the ball may be removed by feeding out a few inches of wire and cutting off the end of the wire with wire cutters.

6. When no more welding is to be done, close the valve on the gas cylinder, momentarily operate the gun trigger to release gas pressure, then turn off the machine.

B-15

Contact Tip

Wire Electrode

FIGURE B.24

3. The Correct Electrical Stickout (ESO)

The electrical stickout (ESO) is the distance from the end of the contact tip to the end of the wire. See Figure B.24.

Once the arc has been established, maintaining the correct ESO becomes extremely important. The ESO should be approximately 3/8 to 1/2 inch (10 to 12 mm) long.

4. The Correct Welding Speed

The important thing to watch while welding is the puddle of molten metal right behind the arc. See Figure B.25. Do not watch the arc itself. It is the appearance of the puddle and the ridge where the molten Puddle solidifies that indicates correct welding speed. The ridge should be approximately 3/8” (10 mm) behind the wire electrode.

Most beginners tend to weld too fast, resulting in a thin, uneven, “wormy” looking bead. They are not

watching the molten metal.

LEARNING TO WELD

ESO

B-15

Helpful Hints

1. For general welding, it is not necessary to weave the arc, neither forward or backward nor sideways. Weld along at a steady pace. You will find it easier.

2. When welding on thin plate, you will find that you will have to increase the welding speed, whereas when welding on heavy plate, it is necessary to go more slowly in order to get good penetration.

Practice

The best way of getting practice in the four skills that enable you to maintain:

1. Correct welding position

2. Correct way to strike an arc

3. Correct electrical stickout

4. Correct welding speed is to perform the following exercise.

For the SP-135T, use the following:

Mild Steel 16 gauge or 1/16 inch

(1.6 mm)

Electrode Lincolnweld 0.025 L-56

electrode

Voltage Setting “V” C Wire Feed Speed “o|o” 4

Refer to Figure B.22.

Weld metal ridge

FIGURE B.25

Molten puddle

Base metal

1. Learn to strike an arc by positioning the gun over the joint and touching the wire to the work.

2. Position face shield to protect face and eyes.

3. Depress gun trigger, hold gun so contact tip to work distance Is about 3/8 to 1/2 inch (10 to 12 mm) and the gun is at proper angle.

SP-135T

B-16

LEARNING TO WELD

B-16

TROUBLESHOO TING WELDS

Good welds have excellent appearance.

To Eliminate Porosity (in order of importance):

1. Turn on gas supply, if used

2. Decrease voltage.

3. Increase stickout.

4. Increase WFS (wire feed speed).

5. Decrease drag angle.

6. Decrease travel speed. NOTE: Always be sure the joint is free from moisture,

oil, rust, paint or other contaminants.

To Eliminate a Ropy Convex Bead

(in order of importance):

To Reduce Spatter (in order of importance):

1. Increase voltage.

2. Increase drag angle.

3. Decrease stickout.

4. Increase WFS (wire feed speed).

5. Decrease travel speed.

6. Check for correct gas, if used.

To Correct Poor Penetration (in order of importance):

1. Decrease stickout.

2. Increase WFS (wire feed speed).

3. Increase voltage.

4. Decrease speed.

5. Decrease drag angle.

6. Check for correct gas, if used.

If Arc Blow Occurs (in order of importance): NOTE: Try different ground connection locations

before adjusting procedures.

1. Decrease drag angle.

2. Increase stickout.

3. Decrease voltage.

4. Decrease WFS (wire feed speed.

5. Decrease travel speed.

1. Increase voltage.

2. Decrease stickout.

3. Decrease WFS (wire feed speed.

4. Decrease travel speed.

5. Decrease drag angle.

6. Check for correct gas, if used.

To Eliminate Stubbing* (in order of importance):

1. Increase voltage

2. Decrease WFS (wire feed speed)

3. Decrease stickout

4. Increase drag angle

* Stubbing occurs when the electrode drives through

the molten puddle and hits the bottom plate tending to push the gun up.

SP-135T

B-17

Proper Gun Handling

Most feeding problems are caused by improper handling of the gun cable or electrodes.

1. Do not kink or pull the gun around sharp corners

2. Keep the gun cable as straight as practical when welding.

3. Do not allow dolly wheels or trucks to run over the cables.

4. Keep the cable clean.

5. Innershield electrode has proper surface lubrication. Use only clean, rust-free electrode.

6. Replace contact tip when it becomes worn or the end is fused or deformed.

LEARNING TO WELD

B-17

SP-135T

B-18

APPLICATION CHART

B-18

SP-135T

C-1

ACCESSORIES

C-1

OPTIONAL ACCESSORIES

1. K549-1 .035" (0.9 mm) Innershield® Welding Kit

— Includes a contact tip, a gasless nozzle and a .035/.045" (.9/1.2 mm) cable liner to permit the Magnum™ 100L gun and cable to use .035" (0.9 mm) diameter flux-cored electrode. The fitting on the end of the liner is stenciled with the maximum rated wire size (.045"/1.2 mm). Also included is a 10 lb. (4.5 kg.) spool of .035" (0.9 mm) Innershield NR-211-MP.

See “Innershield (FCAW) Conversion” in this section for installation instructions and MAINTENANCE section for proper feeding component configuration and installation.

2. K664-2 Aluminum Feeding Kit — This kit required for welding with .035 Aluminum wire. This kit may also be used for feeding .035 stainless wire. Included with this kit are a drive roll, liner and contact tip. It is important when changing

between welding with steel wire and aluminum to exchange these components due to the lubricant applied to steel wire. Failure to do so may result in contaminated welds when welding aluminum.

5. K520 Utility Cart — Designed to transport the Lincoln family of small welders. Has provisions for mounting a single gas cylinder. Has front casters and large rear wheels. Handle height is easily adjustable. Bottom tray provided for tools and accessories. Easy assembly required; takes less than 15 minutes.

6. K586-1 Deluxe Adjustable Gas Regulator & Hose Kit

Accommodates CO2or mixed Gas Cylinders.

3. KP665-045C Drive Roll – Optional — Knurled drive roll for feeding .035 (0.9 mm) diameter fluxcored electrode.

4. K695-1 Spot / Stitch Timer Kit — Includes spot timer to control the spot welding arc time, and a stitch timer to control the on/off cycle time of the arc to prevent burnthrough on thin gauge metals. Also includes spot welding nozzle.

The Spot/Stitch Timer Kit installs inside the wire feed compartment, replacing the blank panel located below the gun trigger lead connectors, per the installation instructions (M17920) included with the kit.

SP-135T

C-2

ACCESSORIES

C-2

INNERSHIELD (FCAW) CONVERSION

Several changes are needed to convert the unit for operation with the Innershield (FCAW) process. The K549-1 or K549-2 Innershield Kits include all the necessary accessories for this conversion and are provided for this purpose. The following conversions should be made using the contents of this kit:

1. Change the output polarity to DC(–). See “Work Cable Installation” in Installation section for details.

2. Install proper drive roll for the wire size selected. See “Changing Drive Roll” in Maintenance section for details.

3. Install the proper gun liner and tip for the wire size selected. See “Component Replacement” in Maintenance section for details.

4. Remove gas nozzle (if installed) and install gasless nozzle. To remove, simply unscrew.

5. Load wire into machine and thread into gun and cable per “Welding Wire Loading” section.

REPLACEMENT PARTS

Complete Gun and Cable Assembly

L8311-6 (K530-4)

Contact Tip .025” (0.6 mm)

S19726-1

Contact Tip .030” (0.8 mm)

S19726-2

Contact Tip .035” (0.9 mm)

S19726-3

Contact Tip-Tapered .025” (0.6 mm)

S20278-1

Contact Tip-Tapered .030” (0.8 mm)

S20278-2

Contact Tip-Tapered .035” (0.9 mm)

S20278-3

Liner .023 - .030” (0.6 - 0.8 mm)

M16291-2

Liner .030 - .035” (0.8 - 0.9 mm)

M16291-6

Liner .035/.045” (0.9/1.2 mm)

M16291-1

Gas Diffuser

S19728

Gas Nozzle

M16294

Gas Nozzle-Tip Recessed 3/8” (9.5 mm) Opening I.D.

M16684

Gas Nozzle-Tip Recessed 1/2” (12.7 mm) Opening I.D.

M16684-1

Gas Nozzle-Tip Recessed 5/8” (15.9 mm) Opening I.D.

M16684-2

Spot Welding Nozzle

M17846

Gasless Nozzle (Innershield Only)

M16418

SP-135T

D-1

MAINTENANCE

MAINTENANCE SAFETY PRECAUTIONS

WARNING

ELECTRIC SHOCK can kill.

• Disconnect input power by removing plug from receptacle before working inside SP-135T. Use only grounded receptacle. Do not touch electrically

“hot” parts inside SP-135T.

• Have qualified personnel do the mainte-

nance and trouble shooting work.

ROUTINE MAINTENANCE

POWER SOURCE COMPARTMENT

No user serviceable parts inside! Do not attempt to perform service in the power source (fixed) side of the SP-135T. Take the unit to an authorized Lincoln Service Center if you experience problems. NO maintenance is required.

D-1

In extremely dusty locations, dirt may clog the air passages causing the welder to run hot with premature tripping of thermal protection. If so, blow dirt out of the welder with low pressure air at regular intervals to eliminate excessive dirt and dust build-up on internal parts.

WIRE FEED COMPARTMENT

1. When necessary, vacuum accumulated dirt from gearbox and wire feed section.

2. Occasionally inspect the incoming guide tube and clean inside diameter if necessary.

3. Motor and gearbox have lifetime lubrication and require no maintenance.

FAN MOTOR

Has lifetime lubrication — requires no maintenance.

WIRE REEL SPINDLE

Requires no maintenance. Do not lubricate shaft.

SP-135T

D-2

MAINTENANCE

D-2

GUN AND CABLE MAINTENANCE

FOR MAGNUM™ 100L GUN

Gun Cable Cleaning

Clean cable liner after using approximately 300 lbs (136 kg) of solid wire or 50 lbs (23 kg) of flux-cored wire. Remove the cable from the wire feeder and lay it out straight on the floor. Remove the contact tip from the gun. Using low pressure air, gently blow out the cable liner from the gas diffuser end.

CAUTION

Excessive pressure at the start may cause the dirt to form a plug.

Flex the cable over its entire length and again blow out the cable. Repeat this procedure until no further dirt comes out.

Contact Tips, Nozzles, and Gun Tubes

1. Dirt can accumulate in the contact tip hole and restrict wire feeding. After each spool of wire is used, remove the contact tip and clean it by pushing a short piece of wire through the tip repeatedly. Use the wire as a reamer to remove dirt that may be adhering to the wall of the hole through the tip.

2. Replace worn contact tips as required. A variable or “hunting” arc is a typical symptom of a worn contact tip. To install a new tip, choose the correct size contact tip for the electrode being used (wire size is stenciled on the side of the contact tip) and screw it snugly into the gas diffuser.

3. Remove spatter from inside of gas nozzle and from tip after each 10 minutes of arc time or as required.

4. Be sure the gas nozzle is fully screwed onto the diffuser for gas shielded processes. For the Innershield®process, the gasless nozzle should be screws onto the diffuser.

5. To remove gun tube from gun, remove gas nozzle or gasless nozzle and remove diffuser from gun tube. Remove both collars from each end of the gun handle and separate the handle halves. Loosen the locking nut holding the gun tube in place against the gun end cable connector. Unscrew gun tube from cable connector. To install gun tube, screw the locking nut on the gun tube as far as possible. Then screw the gun tube into the cable connector until it bottoms. Then unscrew (no more than one turn) the gun tube until its axis is perpendicular to the flat sides of the cable connector and pointed in the direction of the trigger. Tighten the locking nut so as to maintain the proper relationship between the gun tube and the cable connector. Replace the gun handle, trigger and diffuser. Replace the gas nozzle or gasless nozzle.

CONFIGURATION OF COMPONENTS IN WIRE FEEDING SYSTEM

Contact Tip Cable Liner Drive Roll

Components shipped with S19726-1 M16291-6 KP665-035 SP-135T• .025” (0.6mm) .035” (0.9mm)

K549-1 .035” (0.9mm) S19726-3 M16291-6 KP665-035 - Use Large groove Innershield Welding Kit .035” (0.9mm) .035 (0.9mm)

K664-2 .035 (0.9mm) S24221-1 M18971-1 M19631 Aluminum or Stainless Kit* .035A (0.9mm) .035” (0.9mm)

• If .030 Solid wire feeding is desired obtain an S19726-2 Contact Tip. * It is important when changing between welding with steel wire and aluminum to exchange feeding components due to the lubricant applied to steel wire. Failure

to do so may result in contaminated welds when welding aluminum.

2 Smooth grooves Small .023-.025 (0.6mm) Large .030” (0.8mm)

SP-135T

D-3

MAINTENANCE

D-3

COMPONENT REPLACEMENT PROCEDURES

CHANGING THE CONT ACT TIP

1. Refer to Figure D.2. Remove the gas nozzle from the gun by unscrewing counter-clockwise.

2. Remove the existing contact tip from the gun by unscrewing counter-clockwise.

3. Insert and hand tighten desired contact tip.

4. Replace gas nozzle.

CHANGING DRIVE ROLL

The drive roll has two grooves; one for .023" – .025" (0.6 mm) solid steel electrode and a larger knurled groove for .030" (0.8 mm) solid and .035" (0.9 mm) flux-cored steel electrode. As shipped, the drive roll is installed in the .030"/.035" (0.8/0.9 mm) position.

If .023" – .025" (0.6 mm) wire is to be used, the drive roll must be reversed as follows:

8. Push a length of straightened welding wire through the wire feeder guide tubes and adjust the position of the drive roll so that the groove is centered on the wire. Make certain the set screw is located on the flat portion of the shaft and tighten.

FIGURE D.1

1. Connect the machine to its rated input power per instructions in Installation section.

2. Release the spring-loaded idle arm tensioner,Item 2, and lift the idle roll arm,

1. (See Figure D.1)

3. Turn the power switch to ON (marked “I”).

4. Set the wire speed to minimum and jog the drive unit with the trigger switch until the drive roll set screw is facing up.

Item 3,

away from the drive roll, Item

CAUTION

When inching the welding wire, the drive rolls, gun connector block, and gun contact tip are energized relative to work and ground and remain energized for several seconds after the gun trigger is released.

5. Turn the power switch to OFF (marked “O”).

6. Loosen the drive roll set screw with the 5/64" (2.0 mm) hex wrench supplied.

7. Remove the drive roll, flip over and reinstall with the .023 – .025" (0.6 mm) groove (the smaller groove) closest to the gearbox.

SP-135T

D-4

Set Screw Brass Cable

Connector

Liner Assembly (Liner bushing to be sealed tight against brass cable connector)

MAINTENANCE

1-1/4 (31.8 mm) Liner Trim Length

Gas Diffuser

Gas Nozzle or Gasless Nozzle

FIGURE D.2

Liner trim length

CHANGING LINER

NOTICE: The variation in cable lengths prevents the interchangeability of liners. Once a liner has been cut for a particular gun, it should not be installed in another gun unless it can meet the liner cutoff length requirement. Refer to Figure D.2.

1. Remove the gas nozzle from the gun by unscrewing counter-clockwise.

2. Remove the existing contact tip from the gun by unscrewing counter-clockwise.

3. Remove the gas diffuser from the gun tube by unscrewing counter-clockwise.

D-4

8. Screw the gas diffuser onto the end of the gun tube and securely tighten.

9. Replace the contact tip and nozzle.

GUN HANDLE PARTS

The gun handle consists of two halves that are held together with a collar on each end. To open up the handle, turn the collars approximately 60 degrees counter-clockwise until the collar reaches a stop. Then pull the collar off the gun handle. If the collars are difficult to turn, position the gun handle against a corner, place a screwdriver against the tab on the collar and give the screwdriver a sharp blow to turn the collar past an internal locking rib. See Figure D-3.

4. Lay the gun and cable out straight on a flat surface. Loosen the set screw located in the brass connector at the wire feeder end of the cable. Pull the liner out of the cable.

5. Insert a new untrimmed liner into the connector end of the cable. Be sure the liner bushing is stenciled appropriately for the wire size being used.

6. Fully seat the liner bushing into the connector. Tighten the set screw on the brass cable connector. At this time, the gas diffuser should not be installed onto the end of the gun tube.

7. With the gas nozzle and diffuser removed from the gun tube, be sure the cable is straight, and then trim the liner to the length shown in the Figure D.2. Remove any burrs from the end of the liner.

SP-135T

➣

Counter-clockwise

FIGURE D.3

E-1

TROUBLESHOOTING

HOW TO USE TROUBLESHOO TING GUIDE

WARNING

Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety and to avoid Electrical Shock, please observe all safety notes and precautions detailed throughout this manual.

__________________________________________________________________________

E-1

This Troubleshooting Guide is provided to help you locate and repair possible machine malfunctions. Simply follow the three-step procedure listed below.

Step 1. LOCATE PROBLEM (SYMPTOM).

Look under the column labeled “PROBLEM (SYMPTOMS)”. This column describes possible symptoms that the machine may exhibit. Find the listing that best describes the symptom that the machine is exhibiting.

Step 2. POSSIBLE CAUSE.

The second column labeled “POSSIBLE CAUSE” lists the obvious external possibilities that may contribute to the machine symptom.

Step 3. RECOMMENDED COURSE OF ACTION

This column provides a course of action for the Possible Cause, generally it states to contact your local Lincoln Authorized Field Service Facility.

If you do not understand or are unable to perform the Recommended Course of Action safely, contact your local Lincoln Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

SP-135T

E-2

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

E-2

PROBLEMS (SYMPTOMS)

Major physical or electrical damage is evident.

No wire feed, weld output or gas flow when gun trigger is pulled. Fan does NOT operate.

No wire feed, weld output or gas flow when gun trigger is pulled Fan operates normally.

POSSIBLE AREAS OF MISADJUSTMENT(S)

OUTPUT PROBLEMS

None Contact your local Authorized Field Service Facility.

1. Make sure correct voltage is applied to the machine (115vac).

2. Make certain that power switch is in the ON position.

3. Make sure circuit breaker inside wire drive compartment is reset.

1. The thermostat may be tripped due to overheating. Let machine cool. Weld at lower duty cycle.

2. Check for obstructions in air flow. Check Gun Trigger connections. See Installation section.

RECOMMENDED COURSE OF ACTION

If all recommended possible areas of misadjustment have been checked and the problem persists,

Contact your local Lincoln Authorized Field Service Facility.

3. Gun trigger may be faulty.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

SP-135T

E-3

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

E-3

PROBLEMS (SYMPTOMS)

No wire feed when gun trigger is pulled. Fan runs, gas flows and machine has correct open circuit voltage (32VDC maximum) – weld output.

PROBLEMS (SYMPTOMS)

POSSIBLE AREAS OF MISADJUSTMENT(S)

FEEDING PROBLEMS

1. If the wire drive motor is running make sure that the correct drive rolls are installed in the machine.

2. Check for clogged cable liner or contact tip.

3. Check for proper size cable liner and contact tip.

POSSIBLE AREAS OF MISADJUSTMENT(S)

RECOMMENDED COURSE OF ACTION

If all recommended possible areas of misadjustment have been checked and the problem persists,

Contact your local Lincoln Authorized Field Service Facility.

RECOMMENDED COURSE OF ACTION

Low or no gas flow when gun trigger is pulled. Wire feed, weld output and fan operate normally.

GAS FLOW PROBLEMS

1. Check gas supply, flow regulator and gas hoses.

2. Check gun connection to machine for obstruction or leaky seals.

If all recommended possible areas of misadjustment have been checked and the problem persists,

Contact your local Lincoln Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

SP-135T

E-4

TROUBLESHOOTING

Observe all Safety Guidelines detailed throughout this manual

E-4

PROBLEMS (SYMPTOMS)

Arc is unstable – Poor starting

POSSIBLE AREAS OF MISADJUSTMENT(S)

WELDING PROBLEMS

1. Check for correct input voltage to machine – 115vac.

2. Check for proper electrode polarity for process.

3. Check gun tip for wear or damage and proper size – Replace.

4. Check for proper gas and flow rate for process. (For MIG only.)

5. Check work cable for loose or faulty connections.

6. Check gun for damage or breaks.

7. Check for proper drive roll orientation and alignment.

RECOMMENDED COURSE OF ACTION

If all recommended possible areas of misadjustment have been checked and the problem persists,

Contact your local Lincoln Authorized Field Service Facility.

8. Check liner for proper size.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your

Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

SP-135T

F-1

THERMOSTAT

(MOUNTED TO

SEC. COIL)

(MOUNTED TO

SEC. COIL)

Only qualified persons should install, use or

service this machine.

Only qualified persons should install, use or

power cord before servicing

Do not operate with covers removed.

Disconnect input power by unplugging

service this machine.

Do not touch electrically live parts

can kill

HIGH VOLTAGE

WIRE SPEED

SPOT/STITCH TIMER OPTIONAL

JUMPERED PLUG STANDARD

203

8910

208

6 5

213

1234

209

GUN TRIGGER

N.C.

539

204

214

541

213

214

DIAGRAMS

WIRE

(W)

539

209

213A

208

211

FEED

MOTOR

FEED

MOTOR

541

(B)

CHOKE

OUTPUT

204

203

204

GUN CABLE

CONDUCTOR

204

59,000 f

204

N.D.

N.B.

202

SWITCH

SELECTOR

BLOCK

203

40V

N.D.

F-1

4-01

M19924

WORK

LEAD COLOR CODE:

B-BLACK

W-WHITE

LEAD COLOR CODE:

B-BLACK

ELECTRICAL SYMBOLS PER E1537

N.A.

203

ELECTRICAL SYMBOLS PER E1537

W-WHITE

BREAKER

N.B. DIODES D1 & D3 ARE MOUNTED

ON THE INSIDE HEATSINK, WHICH

IS CLOSEST TO THE CENTER PANEL.

N.B. DIODES D1 & D3 ARE MOUNTED

ON THE INSIDE HEATSINK, WHICH

N.A. DIODES D2 & D4 ARE MOUNTED

CASE

GROUNDING

CASE

GROUNDING

IS CLOSEST TO THE CENTER PANEL.

ON THE OUTSIDE HEATSINK.

LATCH

STUD

N.D. BOLTED ALUMINUM CONNECTIONS

N.C. COMPONENT VIEWED FROM REAR.

1234

NATIONAL, LOCAL OR

TO EARTH GROUND PER

OTHER APPLICABLE

REQUIRE T12837 JOINT COMPOUND

(DOW CORNING 340) WHEN REATTACHING.

LATCH

678910

CAVITY NUMBERING SEQUENCE

( COMPONENT SIDE OF BOARD )

ELECTRICAL CODES.

CONTROL P.C. BOARD

CR1

SP-135T WIRING DIAGRAM

LS1

N.O.

ON-OFF

N.C.

SWITCH

115V/60HZ

GAS

SOLENOID

24V

FAN MOTOR

115V/60HZ

211

WINDING

AUXILIARY

214

CIRCUIT

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The

specific diagram for a particular code is pasted inside the machine on one of the enclosure panels.

SP-135T

NOTES

SP-135T

● Keep your head out of fumes.

● Use ventilation or exhaust to

remove fumes from breathing zone.

● Turn power off before servicing.

● Do not operate with panel open or

guards off.

WARNING

● Los humos fuera de la zona de res-

piración.

● Mantenga la cabeza fuera de los

humos. Utilice ventilación o aspiración para gases.

● Gardez la tête à l’écart des fumées.

● Utilisez un ventilateur ou un aspira-

teur pour ôter les fumées des zones de travail.

● Vermeiden Sie das Einatmen von

Schweibrauch!

● Sorgen Sie für gute Be- und

Entlüftung des Arbeitsplatzes!

● Mantenha seu rosto da fumaça.

● Use ventilação e exhaustão para

remover fumo da zona respiratória.

● Desconectar el cable de ali-

mentación de poder de la máquina antes de iniciar cualquier servicio.

● Débranchez le courant avant l’entre-

tien.

● Strom vor Wartungsarbeiten

abschalten! (Netzstrom völlig öffnen; Maschine anhalten!)

● Não opere com as tampas removidas.

● Desligue a corrente antes de fazer

serviço.

● Não toque as partes elétricas nuas.

● No operar con panel abierto o

guardas quitadas.

● N’opérez pas avec les panneaux

ouverts ou avec les dispositifs de protection enlevés.

● Anlage nie ohne Schutzgehäuse

oder Innenschutzverkleidung in Betrieb setzen!

● Mantenha-se afastado das partes

moventes.

● Não opere com os paineis abertos

ou guardas removidas.

Spanish

AVISO DE

PRECAUCION

French

ATTENTION

German

WARNUNG

Portuguese

ATENÇÃO

Japanese

Chinese

Korean

Arabic

LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS PRÁTICAS DE SEGURANÇA DO EMPREGADOR.

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

Lincoln Electric IM724 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual