Thank you and congratulations on choosing Miller.
Now you can get the job done and get it done right. We
know you don’t have time to do it any other way.
That’s why when Niels Miller first started building arc
welders in 1929, he made sure his products offered
long-lasting value and superior quality. Like you, his
customers couldn’t afford anything less. Miller
products had to be more than the best they could be.
They had to be the best you could buy.
Today, the people that build and sell Miller products continue the
tradition. They’re just as committed to providing equipment and service
that meets the high standards of quality and value established in 1929.
This Owner’s Manual is designed to help you get the most out of your
Miller products. Please take time to read the Safety precautions. They
will help you protect yourself against potential hazards on the worksite.
We’ve made installation and operation quick
and easy. With Miller you can count on years
of reliable service with proper maintenance.
And if for some reason the unit needs repair,
there’s a Troubleshooting section that will
Miller is the first welding
equipment manufacturer in
the U.S.A. to be registered to
the ISO 9001 Quality System
Standard.
help you figure out what the problem is. The
parts list will then help you to decide which
exact part you may need to fix the problem.
Warranty and service information for your
particular model are also provided.
Miller Electric manufactures a full line
of welders and welding related equipment.
For information on other quality Miller
products, contact your local Miller distributor
to receive the latest full line catalog or
individual catalog sheets. To locate your nearest
distributor or service agency call 1-800-4-A-Miller,
or visit us at www.MillerWelds.com on the web.
Working as hard as you do
– every power source from
Miller is backed by the most
hassle-free warranty in the
business.
Miller offers a Technical
Manual which provides
more detailed service and
parts information for your
unit. T o obtain a Technical
Manual, contact your local
distributor. Your distributor
can also supply you with
Welding Process Manuals
such as SMAW, GTAW,
GMAW, and GMA W-P.
Page 3
WARNING
This product, when used
for welding or cutting,
produces fumes or
gases which contain
chemicals known to the
State of California to
cause birth defects and,
in some cases, cancer.
(California Health &
Safety Code Section
25249.5 et seq.)
The following terms are
used interchangeably
throughout this manual:
MIG = GMAW
SECTION 1 – SAFETY PRECAUTIONS - READ BEFORE USING
1-1.Symbol Usage
Means Warning! Watch Out! There are possible hazards
with this procedure! The possible hazards are shown in
the adjoining symbols.
som _nd_4/98
Y Marks a special safety message.
. Means “Note”; not safety related.
1-2.Arc Welding Hazards
Y The symbols shown below are used throughout this manual to
call attention to and identify possible hazards. When you see
the symbol, watch out, and follow the related instructions to
avoid the hazard. The safety information given below is only
a summary of the more complete safety information found in
the Safety Standards listed in Section 1-4. Read and follow all
Safety Standards.
Y Only qualified persons should install, operate, maintain, and
repair this unit.
Y During operation, keep everybody, especially children, away.
ELECTRIC SHOCK can kill.
Touching live electrical parts can cause fatal shocks
or severe burns. The electrode and work circuit is
electrically live whenever the output is on. The input
live when power is on. In semiautomatic or automatic wire welding, the
wire, wire reel, drive roll housing, and all metal parts touching the
welding wire are electrically live. Incorrectly installed or improperly
grounded equipment is a hazard.
D Do not touch live electrical parts.
D Wear dry, hole-free insulating gloves and body protection.
D Insulate yourself from work and ground using dry insulating mats
or covers big enough to prevent any physical contact with the work
or ground.
D Do not use AC output in damp areas, if movement is confined, or if
there is a danger of falling.
D Use AC output ONLY if required for the welding process.
D If AC output is required, use remote output control if present on
unit.
D Disconnect input power or stop engine before installing or
servicing this equipment. Lockout/tagout input power according to
OSHA 29 CFR 1910.147 (see Safety Standards).
D Properly install and ground this equipment according to its
Owner’s Manual and national, state, and local codes.
D Always verify the supply ground – check and be sure that input
power cord ground wire is properly connected to ground terminal in
disconnect box or that cord plug is connected to a properly
grounded receptacle outlet.
D When making input connections, attach proper grounding conduc-
tor first – double-check connections.
D Frequently inspect input power cord for damage or bare wiring –
replace cord immediately if damaged – bare wiring can kill.
D Turn off all equipment when not in use.
D Do not use worn, damaged, undersized, or poorly spliced cables.
D Do not drape cables over your body.
power circuit and machine internal circuits are also
This group of symbols means Warning! Watch Out! possible
ELECTRIC SHOCK, MOVING PARTS, and HOT PARTS hazards.
Consult symbols and related instructions below for necessary actions
to avoid the hazards.
D If earth grounding of the workpiece is required, ground it directly
with a separate cable.
D Do not touch electrode if you are in contact with the work, ground,
or another electrode from a different machine.
D Use only well-maintained equipment. Repair or replace damaged
parts at once. Maintain unit according to manual.
D Wear a safety harness if working above floor level.
D Keep all panels and covers securely in place.
D Clamp work cable with good metal-to-metal contact to workpiece
or worktable as near the weld as practical.
D Insulate work clamp when not connected to workpiece to prevent
contact with any metal object.
D Do not connect more than one electrode or work cable to any
single weld output terminal.
SIGNIFICANT DC VOLTAGE exists after removal of
input power on inverters.
D Turn Off inverter, disconnect input power, and discharge input
capacitors according to instructions in Maintenance Section
before touching any parts.
FUMES AND GASES can be hazardous.
Welding produces fumes and gases. Breathing
these fumes and gases can be hazardous to your
health.
D Keep your head out of the fumes. Do not breathe the fumes.
D If inside, ventilate the area and/or use exhaust at the arc to remove
welding fumes and gases.
D If ventilation is poor, use an approved air-supplied respirator.
D Read the Material Safety Data Sheets (MSDSs) and the
manufacturer’s instructions for metals, consumables, coatings,
cleaners, and degreasers.
D Work in a confined space only if it is well ventilated, or while
wearing an air-supplied respirator. Always have a trained watchperson nearby. Welding fumes and gases can displace air and
lower th e oxygen level causing injury or death. Be sure the breathing air is safe.
D Do not weld in locations near degreasing, cleaning, or spraying op-
erations. The heat and rays of the arc can react with vapors to form
highly toxic and irritating gases.
D Do not weld on coated metals, such as galvanized, lead, or
cadmium plated steel, unless the coating is removed from the weld
area, the area is well ventilated, and if necessary, while wearing an
air-supplied respirator. The coatings and any metals containing
these elements can give off toxic fumes if welded.
OM-1313 Page 1
Page 6
ARC RAYS can burn eyes and skin.
BUILDUP OF GAS can injure or kill.
Arc rays from the welding process produce intense
visible and invisible (ultraviolet and infrared) rays
that can burn eyes and skin. Sparks fly off from the
weld.
D Wear a welding helmet fitted with a proper shade of filter to protect
your face and eyes when welding or watching (see ANSI Z49.1
and Z87.1 listed in Safety Standards).
D Wear approved safety glasses with side shields under your
helmet.
D Use protective screens or barriers to protect others from flash and
glare; warn others not to watch the arc.
D Wear protective clothing made from durable, flame-resistant mate-
rial (leather and wool) and foot protection.
WELDING can cause fire or explosion.
Welding on closed containers, such as tanks,
drums, or pipes, can cause them to blow up. Sparks
can fly off from the welding arc. The flying sparks, hot
burns. Accidental contact of electrode to metal objects can cause
sparks, explosion, overheating, or fire. Check and be sure the area is
safe before doing any welding.
D Protect yourself and others from flying sparks and hot metal.
D Do not weld where flying sparks can strike flammable material.
D Remove all flammables within 35 ft (10.7 m) of the welding arc. If
this is not possible, tightly cover them with approved covers.
D Be alert that welding sparks and hot materials from welding can
easily go through small cracks and openings to adjacent areas.
D Watch for fire, and keep a fire extinguisher nearby.
D Be aware that welding on a ceiling, floor, bulkhead, or partition can
cause fire on the hidden side.
D Do not weld on closed containers such as tanks, drums, or pipes,
unless they are properly prepared according to AWS F4.1 (see
Safety Standards).
D Connect work cable to the work as close to the welding area as
practical to prevent welding current from traveling long, possibly
unknown paths and causing electric shock and fire hazards.
D Do not use welder to thaw frozen pipes.
D Remove stick electrode from holder or cut off welding wire at
contact tip when not in use.
D Wear oil-free protective garments such as leather gloves, heavy
shirt, cuffless trousers, high shoes, and a cap.
D Remove any combustibles, such as a butane lighter or matches,
from your person before doing any welding.
workpiece, and hot equipment can cause fires and
FLYING METAL can injure eyes.
D Welding, chipping, wire brushing, and grinding
cause sparks and flying metal. As welds cool,
they can throw off slag.
D Wear approved safety glasses with side
shields even under your welding helmet.
D Shut off shielding gas supply when not in use.
D Always ventilate confined spaces or use
approved air-supplied respirator.
HOT PARTS can cause severe burns.
D Do not touch hot parts bare handed.
D Allow cooling period before working on gun or
torch.
MAGNETIC FIELDS can affect pacemakers.
D Pacemaker wearers keep away.
D Wearers should consult their doctor before
going near arc welding, gouging, or spot
welding operations.
NOISE can damage hearing.
Noise from some processes or equipment can
damage hearing.
D Wear approved ear protection if noise level is
high.
CYLINDERS can explode if damaged.
Shielding gas cylinders contain gas under high
pressure. If damaged, a cylinder can explode. Since
gas cylinders are normally part of the welding
process, be sure to treat them carefully.
D Protect compressed gas cylinders from excessive heat, mechani-
cal shocks, slag, open flames, sparks, and arcs.
D Install cylinders in an upright position by securing to a stationary
support or cylinder rack to prevent falling or tipping.
D Keep cylinders away from any welding or other electrical circuits.
D Never drape a welding torch over a gas cylinder.
D Never allow a welding electrode to touch any cylinder.
D Never weld on a pressurized cylinder – explosion will result.
D Use only correct shielding gas cylinders, regulators, hoses, and fit-
tings designed for the specific application; maintain them and
associated parts in good condition.
D Turn face away from valve outlet when opening cylinder valve.
D Keep protective cap in place over valve except when cylinder is in
use or connected for use.
D Read and follow instructions on compressed gas cylinders,
associated equipment, and CGA publication P-1 listed in Safety
Standards.
OM-1313 Page 2
Page 7
1-3.Additional Symbols For Installation, Operation, And Maintenance
FIRE OR EXPLOSION hazard.
D Do not install or place unit on, over, or near
combustible surfaces.
D Do not install unit near flammables.
D Do not overload building wiring – be sure power supply system is
properly sized, rated, and protected to handle this unit.
FALLING UNIT can cause injury.
D Use lifting eye to lift unit only, NOT running
gear, gas cylinders, or any other accessories.
D Use equipment of adequate capacity to lift and
support unit.
D If using lift forks to move unit, be sure forks are
long enough to extend beyond opposite side of
unit.
OVERUSE can cause OVERHEATING
D Allow cooling period; follow rated duty cycle.
D Reduce current or reduce duty cycle before
starting to weld again.
D Do not block or filter airflow to unit.
STATIC (ESD) can damage PC boards.
MOVING PARTS can cause injury.
D Keep away from moving parts such as fans.
D Keep all doors, panels, covers, and guards
closed and securely in place.
H.F. RADIATION can cause interference.
D High-frequency (H.F.) can interfere with radio
navigation, safety services, computers, and
communications equipment.
D Have only qualified persons familiar with
electronic equipment perform this installation.
D The user is responsible for having a qualified electrician prompt-
ly correct any interference problem resulting from the installation.
D If notified by the FCC about interference, stop using the
equipment at once.
D Have the installation regularly checked and maintained.
D Keep high-frequency source doors and panels tightly shut, keep
spark gaps at correct setting, and use grounding and shielding to
minimize the possibility of interference.
D Put on grounded wrist strap BEFORE handling
boards or parts.
D Use proper static-proof bags and boxes to
store, move, or ship PC boards.
MOVING PARTS can cause injury.
D Keep away from moving parts.
D Keep away from pinch points such as drive
rolls.
WELDING WIRE can cause injury.
D Do not press gun trigger until instructed to do
so.
D Do not point gun toward any part of the body,
other people, or any metal when threading
welding wire.
1-4.Principal Safety Standards
Safety in Welding and Cutting, ANSI Standard Z49.1, from American
Welding Society, 550 N.W . LeJeune Rd, Miami FL 33126
Safety and Health Standards, OSHA 29 CFR 1910, from Superintendent of Documents, U.S. Government Printing Office, Washington, D.C.
20402.
Recommended Safe Practices for the Preparation for Welding and Cutting of Containers That Have Held Hazardous Substances, American
Welding Society Standard AWS F4.1, from American Welding Society,
550 N.W. LeJeune Rd, Miami, FL 33126
National Electrical Code, NFPA Standard 70, from National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
ARC WELDING can cause interference.
D Electromagnetic energy can interfere with
sensitive electronic equipment such as
computers and computer-driven equipment
such as robots.
D Be sure all equipment in the welding area is
electromagnetically compatible.
D To reduce possible interference, keep weld cables as short as
possible, close together, and down low, such as on the floor.
D Locate welding operation 100 meters from any sensitive elec-
tronic equipment.
D Be sure this welding machine is installed and grounded
according t o this manual.
D If interference still occurs, the user must take extra measures
such as moving the welding machine, using shielded cables,
using line filters, or shielding the work area.
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1,
from Compressed Gas Association, 1235 Jefferson Davis Highway,
Suite 501, Arlington, VA 22202.
Code for Safety in Welding and Cutting, CSA Standard W117.2, from
Canadian Standards Association, Standards Sales, 178 Rexdale
Boulevard, Rexdale, Ontario, Canada M9W 1R3.
Safe Practices For Occupation And Educational Eye And FaceProtection, ANSI Standard Z87.1, from American National Standards
Institute, 1430 Broadway, New Y ork, NY 10018.
Cutting And Welding Processes, NFPA Standard 51B, from National
Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
OM-1313 Page 3
Page 8
1-5.EMF Information
Considerations About Welding And The Effects Of Low Frequency
Electric And Ma g netic Fields
Welding current, as it flows through welding cables, will cause electromagnetic fields. There has been and still is some concern about such
fields. However, after examining more than 500 studies spanning 17
years of research, a special blue ribbon committee of the National
Research Council concluded that: “The body of evidence, in the
committee’s judgment, has not demonstrated that exposure to power-
frequency electric and magnetic fields is a human-health hazard.”
However, studies are still going forth and evidence continues to be
examined. Until the final conclusions of the research are reached, you
may wish to minimize your exposure to electromagnetic fields when
welding or cutting.
To reduce magnetic fields in the workplace, use the following
procedures:
1. Keep cables close together by twisting or taping them.
2. Arrange cables to one side and away from the operator.
3. Do not coil or drape cables around your body.
4. Keep welding power source and cables as far away from operator as practical.
5. Connect work clamp to workpiece as close to the weld as possible.
About Pacemakers:
Pacemaker wearers consult your doctor first. If cleared by your doctor,
then following the above procedures is recommended.
OM-1313 Page 4
Page 9
2-1.Specifications
Rated Welding
Output
Amperage
Range
SECTION 2 – INSTALLATION
Amperes Input at
Maximum
Open-Circuit
Voltage DC
Voltage DC
Rated Load
Output, 60 Hz,
Single-Phase
200 V230 VKVAKW
Weight
Overall
Dimensions
Length: 36 in
(915 mm)
150 A @ 23 Volts
DC, 60% Duty Cycle
30 – 1853330 (1.6)*26 (1.4)* 6 (0.27)* 5 (0.13)*
165 lb
(75 kg)
Wire Type And Diameter
Solid Steel /
Stainless
Flux CoredAluminum
Calculated Wire Speed
Range At No Load
Max Wire Feed Speed
While Welding
Steel
.023 – .035 in
(0.6 - 0.9 mm)
*While idling
Operating Temperature Range – –20C to +40CStorage Temperature Range – -30C to + 50C
Volt-ampere curves show minimum and maximum voltage and
amperage output capabilities of
unit. Curves of other settings fall between curves shown.
Width: 18 in
(457 mm)
Height: 27 in
(686 mm)
va_curve1 4/95 – SB-180 824
OM-1313 Page 5
Page 10
2-3.Welding Power Source Duty Cycle And Overheating
60% Duty Cycle At 150 Amperes
Duty Cycle is percentage of 10 mi n utes that unit can weld at rated load
without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
voltage, or duty cycle before
welding.
Y Exceeding duty cycle can
damage unit and void
warranty.
6 Minutes Welding4 Minutes Resting
Overheating
0
15
Reduce Duty Cycle
Minutes
A or V
OR
2-4.Welding Gun Duty Cycle And Overheating
CAUTION
WELDING LONGER THAN RATED DUTY CYCLE can damage gun and void warranty.
• Do not weld at rated load longer than shown below.
• Using gasless flux cored wire reduces gun duty cycle.
Definition.023 To .045 in (0.6 To 1.1 mm)
0
10
Minutes
Duty Cycle is percentage of 10
minutes that gun can weld at
rated load without overheating.
Hard Or Flux Cored Wires
100% Duty Cycle At 150 Amperes
100% Duty Cycle At 120 Amperes
Using CO
Using Mixed Gases
2
.023 To .045 in (0.6 To 1.1 mm) Hard Or Flux Cored Wires
60% Duty Cycle At 200 Amperes
Using CO
60% Duty Cycle At 150 Amperes
Using Mixed Gases
duty1 4/95 – SB-181 009
warn7.1 8/93
2
OM-1313 Page 6
Continuous Welding
6 Minutes Welding4 Minutes Resting
SB1.1 8/93
Page 11
2-5.Installing Work Clamp
1 Work Cable
2 Boot
Slide boot onto work cable. Route
cable out front panel opening from
4
5
1
2
inside.
3 Negative (–) Output Terminal
Connect cable to terminal and
cover connection with boot.
4 Hardware
5 Work Clamp
Route cable through clamp handle
and secure as shown.
Close door.
2-6.Installing Gas Supply
Tools Needed:
5/8, 1-1/8 in
6
3
4
7
5
Tools Needed:
OR
89
1/2, 3/4 in
Argon Gas
CO2 Gas
Obtain gas cylinder and chain to
running gear, wall, or other station-
1
ary support so cylinder cannot fall
and break off valve.
1 Cap
2 Cylinder Valve
2
Remove c ap, stand to side of valve,
and open valve slightly. Gas flow
blows dust and dirt from valve.
Close valve.
3 Cylinder
3
4 Regulator/Flowmeter
Install so face is vertical.
5 Regulator/Flowmeter Gas
Hose Connection
6 Welding Power Source Gas
Hose Connection
Connect customer supplied gas
hose between regulator/flowmeter
gas hose connection, and fitting on
1
rear of welding power source.
7 Flow Adjust
Typical flow rate is 20 cfh (cubic feet
Install adapter with O-ring between
regulator/flowmeter and CO
cylinder.
ST-801 566-A
2
ST-801 571 / ST-802 028
OM-1313 Page 7
Page 12
2-7.Installing Welding Gun
1 Drive Assembly
2 Gun Securing Knob
3 Gun End
1
2
3
4
Loosen securing knob. Insert gun
end through opening until it bottoms
against drive assembly. Tighten
nut.
4 Gun Trigger Plug
Insert plug into receptacle, and
tighten threaded collar.
Close door.
2-8.Setting Gun Polarity
Ref. ST-801 567
1 Polarity Changeover Label
Always read and follow manufac-
ture’s recommended polarity.
1
Tools Needed:
OM-1313 Page 8
3/4, 11/16 in
Ref. 190 821-A
Page 13
2-9.Installing Wire Spool And Adjusting Hub Tension
Use compression spring with
8 in (200 mm) spools.
Tools Needed:
15/16 in
2-10. Changing Input Voltage
2
3
When a slight force is needed
to turn spool, tension is set.
1
ST-072573-B
Y Turn Off unit, and disconnect
input power.
Unit was shipped from factory set
for 230 volts.
1 Transformer T1
2 Rear Of Power Switch S1
3 Lead Marked 230 Volt And
Fan Motor Lead
Disconnect 230 volt lead and fan
motor lead from rear of S1. Leave
fan motor lead connected to 230
volt lead.
4 Lead Marked 200 Volt
Remove cable tie, and slide short
piece of sleeving off 200 volt lead,
and slide sleeving over end of 230
volt and fan motor leads. Fold
sleeving ov e r a n d s e c u r e i n p l a c e .
Connect 200 volt lead to S1 where
230 volt lead was removed.
Reinstall wrapper.
Tools Needed:
3/8, 7/16 in
4
ST-801 580-A
OM-1313 Page 9
Page 14
2-11. Electrical Service Guide
Input Voltage200230
Input Amperes At Rated Output3026
Max Recommended Standard Fuse Or Circuit Breaker Rating In Amperes
Circuit Breaker 1, Time-Delay
Normal Operating
Min Input Conductor Size In AWG/Kcmil1010
Max Recommended Input Conductor Length In Feet (Meters)
Min Grounding Conductor Size In AWG/Kcmil1010
Reference: 1999 National Electrical Code (NEC)
1 Choose a circuit breaker with time-current curves comparable to a Time Delay Fuse.
2 “Time-Delay” fuses are UL class “RK5” .
3 “Normal Operating” (general purpose – no intentional delay) fuses are UL class “K5” (up to and including 60 amp), and UL class “H” ( 65 amp and
above).
Y Caution: Failure to follow these fuse and circuit breaker recommendations could create an electric shock or fire hazard.
2
3
3530
4540
97
(29)
128
(39)
2-12. Selecting A Location And Connecting Input Power
1 Rating Label
Supply correct input power.
Y Do not move or operate unit
where it could tip.
18 in (457 mm) of
space for airflow
Y Always connect grounding
conductor first.
= GND/PE
5
L1
L2
2 Plug
3 Receptacle
Connect plug to receptacle.
4 Input And Grounding
Conductors
Connect directly to line disconnect
device if hard wiring is required.
5 Line Disconnect Device
See Section 2-11.
Y Special installation may be
required where gasoline or
volatile liquids are present –
see NEC Article 511 or CEC
Section 2 0 .
OM-1313 Page 10
1
1
4
2
3
L2
230 VAC, 1
L1
801 568 / Ref. 800 797-B
Page 15
2-13. Threading Welding Wire
6 in
(150 mm)
Tools Needed:
4 in
(102 mm)
Open pressure assembly.Pull and hold wire; cut off end.Push wire thru guides into gun;
continue to hold wire.
Tighten
. Use pressure indicator
scale to set a desired
drive roll pressure.
Pressure
Indicator
Scale
Close and tighten pressure
1
2
3
4
Remove gun nozzle and contact tip.Turn On.
assembly, and let go of wire.
Press gun trigger until wire
comes out of gun. Reinstall
contact tip and nozzle.
Tighten
WOOD
Feed wire to check drive roll pressure.
Tighten knob enough to prevent slipping.
1
2
3
4
Cut off wire. Close
and latch door.
Ref. ST-801 570-A / ST-801 083 / S-0627-A
OM-1313 Page 11
Page 16
Notes
OM-1313 Page 12
Page 17
SECTION 3 – OPERATION
3-1.Front Panel Controls
Controls For Standard Units
1 Wire Speed Control
Use control to select a wire feed
speed. Scale around control is not
actual wire feed speed, but is for
reference only.
2 Voltage Switch
The higher the selected number,
the thicker the material that can be
welded (see Section 3-2). Do not
switch while welding.
3 Power Switch
1
2
3
Ref. ST-180 930
OM-1313 Page 13
Page 18
3-2.Weld Parameter Chart
*Line voltage can affect weld output, settings on this chart are starting values only. You may need to adjust
voltage and wire feed speed to optimize your settings.
OM-1313 Page 14
Input Line
Voltage*
Higher
e.g. 240
Volts AC
230 Volts AC
Lower
e.g. 218
Volts AC
Parameter
Chart Settings
Weld Will Be
Hotter
Lower Settings
Use Parameter
Chart Inside
Door
Weld Will Be
Colder
Raise Settings
Page 19
Ref. 197 949
OM-1313 Page 15
Page 20
SECTION 4 – MAINTENANCE & TROUBLESHOOTING
4-1.Routine Maintenance
Replace
Damaged Or
Unreadable
Labels
Blow Out Or
Vacuum Inside
4-2.Circuit Breakers CB1 And CB2
Y Disconnect power
before maintaining.
3 Months
6 Months
2
1
Repair Or
Replace
Cracked
Cables And
Cords
Remove drive roll
and apply light coat
of oil or grease to
drive motor shaft.
. Maintain more often
during severe conditions.
Clean And
Tighten
Weld
Terminals
Y Turn Off unit.
1 Circuit Breaker CB1
CB1 protects the transformer from
overload. If CB1 opens, wire
feeding stops.
2 Circuit Breaker CB2
CB2 protects the trigger circuit from
overload. If CB2 opens, weld output
stops.
Press button to reset circuit
breaker. Close door.
4-3.Changing Drive Roll And Inlet Wire Guide
Tools Needed:
2
OM-1313 Page 16
Ref. ST-801 567
1 Drive Roll
Choose correct drive roll for wire
type, and install as shown.
2 Inlet Wire Guide
Remove guide by pressing on
barbed area, or cutting off one end
near housing and pulling it out of
hole. Push new guide into hole from
rear until it snaps in place.
1
Ref. ST-801 569-A
Page 21
4-4.Cleaning Or Replacing Gun Liner
Y Disconnect gun first.
Head Tube
Remove nozzle, contact tip, and
adapter.
3/8 in
Tools Needed:
3/8 in
Lay gun cable out straight
before installing new liner.
Blow out gun casing.
Remove liner.
To Reassemble Gun:
Insert new liner.
Install and tighten wire outlet guide.
Cut liner off 3/4 in (20 mm) (3/8 in
[9.5 mm] for aluminum) from head
tube.
Install adapter, contact tip, and
nozzle.
Ref. ST-800 797-C
OM-1313 Page 17
Page 22
4-5.Replacing Switch And/Or Head Tube
Y Disconnect gun first.
1 Remove handle
locking nut.
4 Secure head
tube in vice.
3 Slide handle.
2 Remove switch housing. Note: If installing new
switch, push switch lead connectors onto terminal of
new switch (polarity is not important). Install switch
back into handle, and secure with handle locking nut.
If replacing head tube, continue to end of figure.
5 Loosen jam nut. Remove
from vice and turn head
tube out by hand.
6 Install existing shock washer onto
new head tube. Hand-tighten head
tube into connector cable.
8 Remove from vice. Reposition
handle and install switch housing.
Secure with handle locking nut.
7 Place head tube in vice and tighten
until nuts are tight.
Tools Needed:
OM-1313 Page 18
3/4 in
Ref. ST-800 795-C
Page 23
4-6.Replacing Gun Contact Tip
Tools Needed:
2
1
4-7.Troubleshooting
Welding TroubleRemedy
No weld output; wire does not feed.Secure power cord plug in receptacle (see Section 2-12).
Check and replace power switch if necessary.
Y Turn Off unit.
1 Nozzle
2 Contact Tip
Cut off welding wire at contact tip.
Remove nozzle.
Remove contact tip and install new
contact tip. Reinstall nozzle.
Ref. 800 797-C
Check circuit breakers CB1 and/or CB2, and reset if necessary (see Section 4-2).
Replace building line fuse or reset circuit breaker if open (see Section 2-12).
Secure gun plug in receptacle or repair leads, or replace trigger switch (see Section 2-7 and/or 4-5).
Thermostat TP1 open (overheating). Allow fan to run; the thermostat will close when the unit has cooled
(see Section 2-3).
No weld output; wire feeds.Connect work clamp to get good metal to metal contact.
Replace contact tip (see Section 4-6).
Low weld output.Connect unit to proper input voltage or check for low line voltage (see Section 2-12).
Low, high, or erratic wire speed.Readjust front panel settings (see Section 3-1).
Change to correct size drive roll (see Section 4-3).
Readjust drive roll pressure (see Section 2-13).
Replace inlet guide, contact tip, and/or liner if necessary (see Sections 2-13, and 4-4).
Wire Drive/Gun TroubleRemedy
Electrode wire feeding stops during
welding.
Straighten gun cable and/or replace damaged parts (see Section 4-4).
Adjust drive roll pressure (see Section 2-13).
Readjust hub tension (see Section 2-9).
Replace contact tip if blocked (see Section 4-6).
Clean or replace wire inlet guide or liner if dirty or plugged (see Section 4-4).
Replace drive roll if worn or slipping (see Section 4-3).
Secure gun plug in receptacle or repair leads, or replace trigger switch (see Section 2-7 and/or 4-4).
Check and clear any restrictions at drive assembly and liner (see Section 4-4).
Have nearest Factory Authorized Service Agent check drive motor.
OM-1313 Page 19
Page 24
SECTION 5 – ELECTRICAL DIAGRAM
OM-1313 Page 20
SB-186 065
Figure 5-1. Circuit Diagram
Page 25
SECTION 6 – MIG WELDING (GMAW) GUIDELINES
6-1.Typical MIG Process Connections
Regulator/
Flowmeter
Wire Feeder/
Gas
Power Source
Y Weld current can damage
electronic parts in vehicles.
Disconnect both battery
cables before welding on a
vehicle. P l a c e w o r k c l a m p a s
close t o the weld as possible.
Shielding
Gas
Gun
Work Clamp
Workpiece
light mig 5/967 / Ref. 801 909 / Ref. 801 570-B
OM-1313 Page 21
Page 26
6-2.Typical MIG Process Control Settings
NOTE
These settings are guidelines only. Material and wire type, joint design, fitup,
position, shielding gas, etc. affect settings. Test welds to be sure they comply to
specifications.
Welding wire is energized when gun trigger is pressed. Before lowering helmet and
pressing trigger, be sure wire is no more than 1/2 in (13 mm) past end of nozzle,
and tip of wire is positioned correctly on seam.
1
2
5
4
0°-15°
90°90°
End View of Work AngleSide View of Gun Angle
GROOVE WELDS
1 Hold Gun and Control Gun
Trigger
2 Workpiece
3
3 Work Clamp
4 Electrode Extension (Stickout)
1/4 to 1/2 in (6 To 13 mm)
5 Cradle Gun and Rest Hand on
Workpiece
45°
45°
End View of Work AngleSide View of Gun Angle
FILLET WELDS
0°-15°
S-0421-A
OM-1313 Page 23
Page 28
6-4.Conditions That Affect Weld Bead Shape
NOTE
Weld bead shape depends on gun angle, direction of travel, electrode extension
(stickout), travel speed, thickness of base metal, wire feed speed (weld current),
and voltage.
10°
Push
Perpendicular
GUN ANGLES AND WELD BEAD PROFILES
ShortNormalLong
10°
Drag
ELECTRODE EXTENSIONS (STICKOUT)
ShortNormalLong
FILLET WELD ELECTODE EXTENSIONS (STICKOUT)
Slow
NormalFast
GUN TRAVEL SPEED
S-0634
OM-1313 Page 24
Page 29
6-5.Gun Movement During Welding
NOTE
Normally , a single stringer bead is satisfactory for most narrow groove weld joints;
however, for wide groove weld joints or bridging across gaps, a weave bead or
multiple stringer beads works better.
12
3
6-6.Poor Weld Bead Characteristics
1 Stringer Bead – Steady
Movement Along Seam
2 Weave Bead – Side To Side
Movement Along Seam
3 Weave Patterns
Use weave patterns to cover a wide
area in one pass of the electrode.
S-0054-A
2
6-7.Good Weld Bead Characteristics
2
4
3
1 Large Spatter Deposits
1
4
3
5
1
2 Rough, Uneven Bead
3 Slight Crater During Welding
4 Bad Overlap
5 Poor Penetration
S-0053-A
1 Fine Spatter
2 Uniform Bead
3 Moderate Crater During
Welding
Weld a new bead or layer for each
1/8 in (3.2 mm) thickness in metals
being welded.
4 No Overlap
5 Good Penetration into Base
Metal
5
OM-1313 Page 25
S-0052-B
Page 30
6-8.Troubleshooting – Excessive Spatter
Excessive Spatter – scattering of molten metal particles that
cool to solid form near weld bead.
S-0636
Possible CausesCorrective Actions
Wire feed speed too high.Select lower wire feed speed.
Voltage too high.Select lower voltage range.
Electrode extension (stickout) too long.Use shorter electrode extension (stickout).
Workpiece dirty.Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before welding.
Insufficient shielding gas at welding arc.Increase flow of shielding gas at regulator/flowmeter and/or prevent drafts near welding arc.
Dirty welding wire.Use clean, dry welding wire.
Eliminate pickup of oil or lubricant on welding wire from feeder or liner.
6-9.Troubleshooting – Porosity
Porosity – small cavities or holes resulting from gas pockets
in weld metal.
S-0635
Possible CausesCorrective Actions
Insufficient shielding gas at welding arc.Increase flow of shielding gas at regulator/flowmeter and/or prevent drafts near welding arc.
Remove spatter from gun nozzle.
Check gas hoses for leaks.
Place nozzle 1/4 to 1/2 in (6-13 mm) from workpiece.
Hold gun near bead at end of weld until molten metal solidifies.
Wrong gas.Use welding grade shielding gas; change to different gas.
Dirty welding wire.Use clean, dry welding wire.
Eliminate pick up of oil or lubricant on welding wire from feeder or liner.
Workpiece dirty.Remove all grease, oil, moisture, rust, paint, coatings, and dirt from work surface before welding.
Use a more highly deoxidizing welding wire (contact supplier).
Welding wire extends too far out of nozzle.Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.
6-10. Troubleshooting – Excessive Penetration
Excessive Penetration – weld metal melting through base metal
and hanging underneath weld.
Excessive Penetration
Possible CausesCorrective Actions
Excessive heat input.Select lower voltage range and reduce wire feed speed.
OM-1313 Page 26
Good Penetration
Increase travel speed.
S-0639
Page 31
6-11. Troubleshooting – Lack Of Penetration
Lack Of Penetration – shallow
fusion between weld metal and
base metal.
Lack of PenetrationGood Penetration
Possible CausesCorrective Actions
S-0638
Improper joint preparation.Material too thick. Joint preparation and design must provide access to bottom of groove while
maintaining proper welding wire extension and arc characteristics.
Improper weld technique.Maintain normal gun angle of 0 to 15 degrees to achieve maximum penetration.
Keep arc on leading edge of weld puddle.
Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.
Insufficient heat input.Select higher wire feed speed and/or select higher voltage range.
Reduce travel speed.
6-12. Troubleshooting – Incomplete Fusion
Incomplete Fusion – failure of weld metal to fuse completely with
base metal or a preceeding weld bead.
Possible CausesCorrective Actions
Workpiece dirty.Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before
welding.
Insufficient heat input.Select higher voltage range and/or adjust wire feed speed.
S-0637
Improper welding technique.Place stringer bead in proper location(s) at joint during welding.
Adjust work angle or widen groove to access bottom during welding.
Momentarily hold arc on groove side walls when using weaving technique.
Keep arc on leading edge of weld puddle.
Use correct gun angle of 0 to 15 degrees.
6-13. Troubleshooting – Burn-Through
Burn-Through – weld metal melting completely through base metal
resulting i n holes where no metal remains.
Possible CausesCorrective Actions
Excessive heat input.Select lower voltage range and reduce wire feed speed.
Increase and/or maintain steady travel speed.
S-0640
OM-1313 Page 27
Page 32
6-14. Troubleshooting – Waviness Of Bead
Waviness O f Bead – weld metal that is not parallel and does not cover
joint formed by base metal.
Possible CausesCorrective Actions
Welding wire extends too far out of nozzle.Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.
Unsteady hand.Support hand on solid surface or use two hands.
6-15. Troubleshooting – Distortion
Distortion – contraction of weld metal during welding that forces
base metal to move.
Base metal moves
in the direction of
the weld bead.
Possible CausesCorrective Actions
Excessive heat input.Use restraint (clamp) to hold base metal in position.
S-0641
S-0642
Make tack welds along joint before starting welding operation.
Select lower voltage range and/or reduce wire feed speed.
Increase travel speed.
Weld in small segments and allow cooling between welds.
OM-1313 Page 28
Page 33
6-16. Common MIG Shielding Gases
This is a general chart for common gases and where they are used. Many different combinations (mixtures) of
shielding gases have been developed over the years. The most commonly used shielding gases are listed in the
following table.
Application
Gas
ArgonX
Argon + 25% CO
80% or greater Argon +
balance CO2 or Oxygen
100% CO
Tri-Mix
1 Limited short circuiting use
2 90% HE + 7-1/2% AR + 2-1/2% CO
2
2
2
Spray Arc SteelShort Circuiting Steel
XX
2
X
1
XX
Short Circuiting
Stainless Steel
X
6-17. Troubleshooting Guide For Semiautomatic Welding Equipment
ProblemProbable CauseRemedy
Wire feed motor operates, but
wire does not feed.
Too little pressure on wire feed rolls.Increase pressure setting on wire feed rolls.
Incorrect wire feed rolls.Check size stamped on wire feed rolls, replace to match
wire size and type if necessary .
Wire spool brake pressure too high.Decrease brake pressure on wire spool.
Restriction in the gun and/or assembly.Check and replace cable, gun, and contact tip if
damaged. Check size of contact tip and cable liner,
replace if necessary.
Aluminum
Wire curling up in front of the
wire feed rolls (bird nesting).
Wire feeds, but no gas flows.
Too much pressure on wire feed rolls.Decrease pressure setting on wire feed rolls.
Incorrect cable liner or gun contact tip size.Check size of contact tip and check cable liner length
Gun end not inserted into drive housing properly.Loosen gun securing bolt in drive housing and push gun
Dirty or damaged (kinked) liner.Replace liner.
Gas cylinder empty.Replace empty gas cylinder.
Gas nozzle plugged.Clean or replace gas nozzle.
Gas cylinder valve not open or flowmeter not adjusted. Open gas valve at cylinder and adjust flow rate.
Restriction in gas line.Check gas hose between flowmeter and wire feeder , and
Loose or broken wires to gas solenoid.Have Factory Authorized Service Agent repair wiring.
Gas solenoid valve not operating.Have Factory Authorized Service Agent replace gas
Incorrect primary voltage connected to welding power
source.
and diameter, replace if necessary.
end into housing just enough so it does not touch wire
feed rolls.
gas hose in gun and cable assembly.
solenoid valve.
Check primary voltage and relink welding power source
for correct voltage.
OM-1313 Page 29
Page 34
ProblemRemedyProbable Cause
Welding arc not stable.
Wire slipping in drive rolls.Adjust pressure setting on wire feed rolls. Replace worn
Wrong size gun liner or contact tip.Match liner and contact tip to wire size and type.
Incorrect voltage setting for selected wire feed speed o n
welding power source.
Loose connections at the gun weld cable or work cable. Check and tighten all connections.
Gun in poor shape or loose connection inside gun.Repair or replace gun as necessary.
+When ordering a component originally displaying a precautionary label, the label should also be ordered.
*When ordering stabilizer 180 989, also order thermostat 163 266.
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
OM-1313 Page 33
Page 38
. Hardware is common and
not available unless listed.
OM-1313 Page 34
ST-801 631-D
Figure 7-2. Center Baffle w/Components
Page 39
Item
No.
Dia.
Mkgs.
Part
No.
Description
Figure 7-2. Baffle, Center w/Components (Fig 7-1 Item 4)
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested
Replacement Parts. Model and serial number required when ordering parts from your local distributor.
OM-1313 Page 37
Page 42
Page 43
Warranty Questions?
Call
1-800-4-A-MILLER
for your local
Miller distributor.
Y our distributor also gives
you ...
Service
Y ou always get the fast,
reliable response you
need. Most replacement
parts can be in your
hands in 24 hours.
Support
Need fast answers to the
tough welding questions?
Contact your distributor.
The expertise of the
distributor and Miller is
there to help you, every
step of the way.
Effective January 1, 2000
(Equipment with a serial number preface of “LA” or newer)
This limited warranty supersedes all previous Miller warranties and is exclusive with no other
LIMITED WARRANTY – Subject to the terms and conditions
below, Miller Electric Mfg. Co., Appleton, Wisconsin, warrants
to its original retail purchaser that new Miller equipment sold
after the effective date of this limited warranty is free of defects
in material and workmanship at the time it is shipped by Miller.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS.
Within the warranty periods listed below, Miller will repair or
replace any warranted parts or components that fail due to
such defects in material or workmanship. Miller must be
notified in writing within thirty (30) days of such defect or
failure, at which time Miller will provide instructions on the
warranty claim procedures to be followed.
Miller shall honor warranty claims on warranted equipment
listed below in the event of such a failure within the warranty
time periods. All warranty time periods start on the date that
the equipment was delivered to the original retail purchaser, or
one year after the equipment is sent to a North American
distributor or eighteen months after the equipment is sent to an
International distributor.
1. 5 Years Parts – 3 Years Labor
* Original main power rectifiers
* Inverters (input and output rectifiers only)
2. 3 Years — Parts and Labor
* Transformer/Rectifier Power Sources
* Plasma Arc Cutting Power Sources
* Semi-Automatic and Automatic Wire Feeders
* Inverter Power Supplies
* Intellitig
* Engine Driven Welding Generators
(NOTE: Engines are warranted separately by
the engine manufacturer .)
3. 1 Year — Parts and Labor
* DS-2 Wire Feeder
* Motor Driven Guns (w/exception of Spoolmate
185 & Spoolmate 250)
* Process Controllers
* Positioners and Controllers
* Automatic Motion Devices
* RFCS Foot Controls
* Induction Heating Power Sources
* Water Coolant Systems
* HF Units
* Grids
* Maxstar 140
* Spot Welders
* Load Banks
* Miller Cyclomatic Equipment
* Running Gear/Trailers
* Plasma Cutting Torches (except APT & SAF
Models)
* Field Options
(NOTE: Field options are covered under True
Bluefor the remaining warranty period of the
product they are installed in, or for a minimum of
one year — whichever is greater.)
4. 6 Months — Batteries
5. 90 Days — Parts
* MIG Guns/TIG Torches
* Induction Heating Coils and Blankets
Miller’s True Blue Limited Warranty shall not apply to:
1. Consumable components; such as contact tips,
cutting nozzles, contactors, brushes, slip rings,
relays or parts that fail due to normal wear.
2. Items furnished by Miller, but manufactured by others,
such as engines or trade accessories. These items are
covered by the manufacturer’s warranty, if any.
3. Equipment that has been modified by any party other
than Miller, or equipment that has been improperly
installed, improperly operated or misused based upon
industry standards, or equipment which has not had
reasonable and necessary maintenance, or equipment
which has been used for operation outside of the
specifications for the equipment.
MILLER PRODUCTS ARE INTENDED FOR PURCHASE
AND USE BY COMMERCIAL/INDUSTRIAL USERS AND
PERSONS TRAINED AND EXPERIENCED IN THE USE
AND MAINTENANCE OF WELDING EQUIPMENT.
In the event of a warranty claim covered by this warranty, the
exclusive remedies shall be, at Miller’s option: (1) repair; or (2)
replacement; or, where authorized in writing by Miller in
appropriate cases, (3) the reasonable cost of repair or
replacement at an authorized Miller service station; or (4)
payment of or credit for the purchase price (less reasonable
depreciation bas e d u p o n a c tual use) upon return of the goods
at customer’s risk and expense. Miller’s option of repair or
replacement will be F.O.B., Factory at Appleton, Wisconsin, or
F.O.B. at a Miller authorized service facility as determined by
Miller. Therefore no compensation or reimbursement for
transportation costs of any kind will be allowed.
TO THE EXTENT PERMITTED BY LAW, THE REMEDIES
PROVIDED HEREIN ARE THE SOLE AND EXCLUSIVE
REMEDIES. I N N O EVENT SHALL MILLER BE LIABLE FOR
DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING LOSS OF
PROFIT), WHETHER BASED ON CONTRACT, TORT OR
ANY OTHER LEGAL THEORY.
ANY EXPRESS WARRANTY NOT PROVIDED HEREIN
AND ANY IMPLIED WARRANTY, GUARANTY OR
REPRESENTATION AS TO PERFORMANCE, AND ANY
REMEDY FOR BREACH OF CONTRACT TORT OR ANY
OTHER LEGAL THEORY WHICH, BUT FOR THIS
PROVISION, MIGHT ARISE BY IMPLICATION,
OPERATION OF LAW, CUSTOM OF TRADE OR COURSE
OF DEALING, INCLUDING ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR PARTICULAR
PURPOSE, WITH RESPECT TO ANY AND ALL
EQUIPMENT FURNISHED BY MILLER IS EXCLUDED AND
DISCLAIMED BY MILLER.
Some states in the U.S.A. do not allow limitations of how long
an implied warranty lasts, or the exclusion of incidental,
indirect, special or consequential damages, so the above
limitation or exclusion may not apply to you. This warranty
provides specific legal rights, and other rights may be
available, but may vary from state to state.
In Canada, legislation in some provinces provides for certain
additional warranties or remedies other than as stated herein,
and to the extent that they may not be waived, the limitations
and exclusions set out above may not apply. This Limited
Warranty provides specific legal rights, and other rights may
be available, but may vary from province to province.
miller_warr 7/00
Page 44
Owner’s Record
Please complete and retain with your personal records.
Model NameSerial/Style Number
Purchase Date(Date which equipment was delivered to original customer.)
Distributor
Address
City
StateZip
For Service
Call 1-800-4-A-Miller or see our website at www.MillerWelds.com
to locate a DISTRIBUTOR or SERVICE AGENCY near you.
Always provide Model Name and Serial/Style Number.
Contact your Distributor for:
Welding Supplies and Consumables
Options and Accessories
Personal Safety Equipment
Service and Repair
Replacement Parts
Training (Schools, Videos, Books)
Technical Manuals (Servicing Information
and Parts)
Circuit Diagrams
Welding Process Handbooks
Miller Electric Mfg. Co.
An Ill inoi s Tool Works Company
1635 West Spencer Street
Appleton, WI 54914 USA
International Headquarters–USA
USA Phone: 920-735-4505 Auto-A t t ended
USA & Canada FAX: 9 20-735-4134
International FAX: 920-735-4125
European Headquarters –
United Kingdom
Phone: 44 (0) 1204-593493
FAX: 44 (0) 1204-598066
www.MillerWelds.com
Contact the Delivering Carrier for:
For assistance in filing or settling claims,
contact your distributor and/or equipment
manufacturer’s Transportation Department.
PRINTED IN USA 2001 Miller Electric Mfg. Co. 1/01
File a claim for loss or damage during
shipment.
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