MIG 250C
MIG 250C
Operating manual
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BOC Smootharc Advance II MIG 250C Operating manual
Welcome to a better way of welding.
This operating manual provides the basic knowledge required for MIG
Welding, as well as highlighting important areas of how to operate the
Smootharc ADVANCE machines.
With normal use and by following these recommended steps, your
Smootharc ADVANCE machine can provide you with years of troublefree service. Smootharc ADVANCE equipment and technical support is
available through the national BOC Customer Service Centre or contact
your local Gas & Gearoutlet.
Important Notice
This document has been prepared by BOC Limited ABN 95 000 029 729 (‘BOC’), as general information and does not contain and is not to be taken as containing any specic recommendation. The document has been prepared in good faith
and is professional opinion only. Information in this document has been derived from third parties, and though BOC believes it to be reliable as at the time of printing, BOC makes no representation or warranty as to the accuracy, reliability or
completeness of information in this document and does not assume any responsibility for updating any information or correcting any error or omission which may become apparent after the document has been issued. Neither BOC nor any of its
agents has independently veried the accuracy of the information contained in this document. The information in this document is commercial in condence and is not to be reproduced. The recipient acknowledges and agrees that it must make
its own independent investigation and should consider seeking appropriate professional recommendation in reviewing and evaluating the information. This document does not take into account the particular circumstances of the recipient and
the recipient should not rely on this document in making any decisions, including but not limited to business, safety or other operations decisions. Except insofar as liability under any statute cannot be excluded, BOC and its aliates, directors,
employees, contractors and consultants do not accept any liability (whether arising in contract, tort or otherwise) for any error or omission in this document or for any resulting loss or damage (whether direct, indirect, consequential or otherwise)
suered by the recipient of this document or any other person relying on the information contained herein. The recipient agrees that it shall not seek to sue or hold BOC or their respective agents liable in any such respect for the provision of this
document or any other information.
3BOC Smootharc Advance II MIG 250C Operating manual
Contents.
1.0 Recommended Safety Guidelines andPrecautions 4
1.1 Health Hazard Information 5
1.2 Personal Protection 5
1.3 Electrical shock 6
1.4 User Responsibility 6
2.0 MIG Process 7
2.1 Introduction to Metal Inert Gas (MIG) 7
2.2 Introduction to Flux Cored Arc Welding (FCAW) 7
2.3 Introduction to Metal Cored Arc Welding (MCAW) 9
2.4 Fundamentals of MIG, FCAW and MCAW 12
3.0 MMA Process 14
3.1 Introduction 14
3.2 Process 14
3.3 Welding Machine 14
3.4 Welding Technique 15
3.5 Electrode Selection 15
3.6 Types of Joints 18
3.7 Fillet Welds 19
3.8 Typical Defects Due to FaultyTechnique 21
4.0 General Welding Information 23
4.1 Recommended Welding Parameters 23
5.0 Correct Application Techniques 25
6.0 Package Contents 27
7.0 Installation 28
7.1 Installation for MIG/MAG process 28
7.2 Installation for MMA process 28
8.0 Operation Set-up 29
8.1 MIG Welding Set-up 29
8.2 MMA Welding Set-up 29
9.0 Control Panel 30
9.1 Controls 30
9.2 Inductance 31
9.3 4T/2T Trigger Latch Selection 31
10.0 Troubleshooting and Fault Finding 32
11.0 Replacement Parts 33
12.0 Periodic Maintenance 34
12.1 Power Source 34
13.0 Technical Specications 35
14.0 Warranty Information 36
14.1 Terms of Warranty 36
14.2 Limitations on Warranty 36
14.3 Warranty Period 36
14.4 Warranty Repairs 36
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BOC Smootharc Advance II MIG 250C Operating manual
1.0 Recommended Safety Guidelines
andPrecautions
Some safety precautions BOC
recommends are as follows:
→ Repair or replace defective cables immediately.
→ Never watch the arc except through
lenses of the correct shade.
→ In conned spaces, adequate ventilation
and constant observation are essential.
→ Leads and cables should be kept clear
of passageways.
→ Keep re extinguishing equipment at a handy location
in the workshop.
→ Keep primary terminals and live parts eectively covered.
→ Never strike an arc on any gas cylinder.
→ Never use oxygen for venting containers.
Diagram and safety explanation
Electrical safety alert
Welding electrode causing electric shock
Fumes and gases coming from welding process
Welding arc rays
Read instruction manual
Become trained
Wear dry, insulated gloves
Insulate yourself from work and ground
Disconnect input power before working on equipment
Keep head out of fumes
Use forced ventilation or local exhaust to remove fumes
Use welding helmet with correct shade of lter
5BOC Smootharc Advance II MIG 250C Operating manual
1.1 Health Hazard Information
The actual process of MIG welding is one that can cause a variety of
hazards. All appropriate safety equipment should be worn at all times,
i.e. headwear, hand and body protection. Electrical equipment should be
used in accordance with the manufacturer’s recommendations.
Eyes
The process produces ultra violet rays that can injure and cause
permanent damage. Fumes can cause irritation.
Skin
Arc rays are dangerous to uncovered skin.
Inhalation
Welding fumes and gases are dangerous to the health of the operator
and to those in close proximity. The aggravation of pre-existing
respiratory or allergic conditions may occur in some workers. Excessive
exposure may cause conditions such as nausea, dizziness, dryness and
irritation of eyes, nose and throat.
1.2 Personal Protection
Respiratory
Conned space welding should be carried out with the aid of a fume
respirator or air supplied respirator as per AS/NZS 1715 and AS/NZS
1716 Standards.
→ You must always have enough ventilation in conned spaces. Be alert
to this at all times.
→ Keep your head out of the fumes rising from the arc.
→ Fumes from the welding of some metals could have an adverse eect
on your health. Don’t breathe them in. If you are welding on material
such as stainless steel, nickel, nickel alloys or galvanised steel,
further precautions are necessary.
→ Wear a respirator when natural or forced ventilation is not sucient.
Eye protection
A welding helmet with the appropriate welding lter lens for the
operation must be worn at all times in the work environment. The
welding arc and the reecting arc ash gives out ultraviolet and infrared
rays. Protective welding screen and goggles should be provided for
others working in the same area.
Recommended lter shades for arc welding
Less than 150 amps Shade 10*
150 to 250 amps Shade 11*
250 to 300 amps Shade 12
300 to 350 amps Shade 13
Over 350 amps Shade 14
*Use one shade darker for aluminium.
Clothing
Suitable clothing must be worn to prevent excessive exposure to UV
radiation and sparks. An adjustable helmet, ameproof loose-tting
cotton clothing buttoned to the neck, protective leather gloves, spats,
apron and steel capped safety boots are highly recommended.
6
BOC Smootharc Advance II MIG 250C Operating manual
1.3 Electrical shock
→ Never touch ‘live’ electrical parts
→ Always repair or replace worn or damagedparts
→ Disconnect power source before performingany maintenance or
service
→ Earth all work materials
→ Never work in moist or damp areas
Avoid electric shock by:
→ Wearing dry insulated boots.
→ Wearing dry leather gloves.
→ Working on a dry insulated oor where possible.
1.4 User Responsibility
→ Read the Operating Manual prior to installation of this machine.
→ Unauthorised repairs to this equipment may endanger the technician
and operator and will void your warranty. Only qualied personnel
approved by BOC should perform repairs.
→ Always disconnect mains power before investigating
equipmentmalfunctions.
→ Parts that are broken, damaged, missing or worn should be
replacedimmediately.
→ Equipment should be cleaned periodically.
BOC stock a huge range of personal protective equipment. This combined
with BOC’s extensive Gas and Gear network ensures fast, reliable service
throughout the South Pacic.
STOP
PLEASE NOTE that under no circumstances should any
equipment or parts be altered or changed in any way from
the standard specication without written permission given
byBOC. To do so will void the EquipmentWarranty.
Further information can be obtained from Welding Institute of Australia
(WTIA) Technical Note No.7.
Health and Safety Welding
Published by WTIA,
PO Box 6165 Silverwater NSW 2128
Phone (02) 9748 4443
7BOC Smootharc Advance II MIG 250C Operating manual
2.0 MIG Process
2.1 Introduction to Metal Inert Gas (MIG)
MIG welding embraces a group of arc welding processes in which a
continuous electrode (the wire) is fed by powered feed rolls (wire
feeder) into the weld pool. An electric arc is created between the tip of
the wire and the weld pool. The wire is progressively melted at the same
speed at which it is being fed and forms part of the weld pool. Both the
arc and the weld pool are protected from atmospheric contamination by
a shield of inert (non-reactive) gas, which is delivered through a nozzle
that is concentric with the welding wire guide tube.
Operation
MIG welding is usually carried out with a handheld torch as a semiautomatic process. The MIG process can be suited to a variety of job
requirements by choosing the correct shielding gas, electrode (wire) size
and welding parameters. Welding parameters include the voltage, travel
speed, arc (stick-out) length and wire feed rate. The arc voltage and wire
feed rate will determine the ller metal transfer method.
This application combines the advantages of continuity, speed,
comparative freedom from distortion and the reliability of automatic
welding with the versatility and control of manual welding. The process
is also suitable for mechanised set-ups, and its use in this respect
isincreasing.
MIG welding can be carried out using solid wire, ux cored, or a copper-
coated solid wire electrode. The shielding gas or gas mixture may consist
of the following:
→ Argon
→ Carbon dioxide
→ Argon and carbon dioxide mixtures
→ Argon mixtures with oxygen or helium mixtures
Each gas or gas mixture has specic advantages and limitations. Other
forms of MIG welding include using a ux-cored continuous electrode
and carbon dioxide shielding gas, or using self-shielding ux-cored wire,
requiring no shielding gas.
2.2 Introduction to Flux Cored
Arc Welding (FCAW)
How it Works
Flux-cored arc welding (FCAW) uses the heat generated by a DC electric
arc to fuse the metal in the joint area, the arc being struck between a
continuously fed consumable ller wire and the workpiece, melting both
the ller wire and the workpiece in the immediate vicinity. The entire arc
area is covered by a shielding gas, which protects the molten weld pool
from the atmosphere.
FCAW is a variant of the MIG process and while there are many common
features between the two processes, there are also several fundamental
dierences.
As with MIG, direct current power sources with constant voltage output
characteristics are normally employed to supply the welding current.
With ux-cored wires the terminal that the ller wire is connected
to depends on the specic product being used, some wires running
electrode positive, others running electrode negative. The work return
is then connected to the opposite terminal. It has also been found that
the output characteristics of the power source can have an eect on the
quality of the welds produced.
The wire feed unit takes the ller wire from a spool, and feeds it
through the welding torch, to the arc at a predetermined and accurately
controlled speed. Normally, special knurled feed rolls are used with ux-
cored wires to assist feeding and to prevent crushing the consumable.
Typical MIG set up
Torch trigger
Welding wire
Weld
Weld pool
Torch
Shroud
Gas diuser
Contact tip
Shielding
Droplets
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BOC Smootharc Advance II MIG 250C Operating manual
Unlike MIG, which uses a solid consumable ller wire, the consumable
used in FCAW is of tubular construction, an outer metal sheath being
lled with uxing agents plus metal powder. The ux ll is also used to
provide alloying, arc stability, slag cover, de-oxidation, and, with some
wires, gas shielding.
In terms of gas shielding, there are two dierent ways in which this may
be achieved with the FCAW process.
→ Additional gas-shielding supplied from an external source, such as a
gas cylinder
→ Production of a shielding gas by decomposition of uxing agents
within the wire, self-shielding
Gas shielded wires are available with either a basic or rutile ux ll,
while self-shielded wires have a broadly basic-type ux ll. The ux
ll dictates the way the wire performs, the properties obtainable, and
suitable applications.
Gas-shielded Operation
Many cored wire consumables require an auxiliary gas shield in the
same way that solid wire MIG consumables do. These types of wire are
generally referred to as ‘gas-shielded’.
Using an auxiliary gas shield enables the wire designer to concentrate
on the performance characteristics, process tolerance, positional
capabilities, and mechanical properties of the products.
In a ux cored wire the metal sheath is generally thinner than that of
a self-shielded wire. The area of this metal sheath surrounding the ux
cored wire is much smaller than that of a solid MIG wire. This means that
the electrical resistance within the ux cored wire is higher than with
solid MIG wires and it is this higher electrical resistance that gives this
type of wire some of its novel operating properties.
One often quoted property of uxed cored wires are their higher
deposition rates than solid MIG wires. What is often not explained is how
they deliver these higher values and whether these can be utilised. For
example, if a solid MIG wire is used at 250 amps, then exchanged for a
ux cored wire of the same diameter, and welding power source controls
are left unchanged, then the current reading would be much less than
250 amps, perhaps as low as 220 amps. This is because of Ohms Law
that states that as the electrical resistance increases if the voltage
remains stable then the current must fall.
To bring the welding current back to 250 amps it is necessary to
increase the wire feed speed, eectively increasing the amount of
wire being pushed into the weld pool to make the weld. It is this aect
that produces the ‘higher deposition rates’ that the ux cored wire
manufacturers claim for this type of product. Unfortunately in many
instances the welder has diculty in utilising this higher wire feed speed
and must either increase the welding speed or increase the size of the
weld. Often in manual applications neither of these changes can be
implemented and the welder simply reduces the wire feed speed back
to where it was and the advantages are lost. However, if the process
is automated in some way then the process can show improvements in
productivity.
It is also common to use longer contact tip to workpiece distances with
ux cored arc welding than with solid wire MIG welding and this also
has the eect of increasing the resistive heating on the wire further
accentuating the drop in welding current. Research has also shown
that increasing this distance can lead to an increase in the ingress of
nitrogen and hydrogen into the weld pool, which can aect the quality
of the weld.
Flux cored arc welding has a lower eciency than solid wire MIG welding
because part of the wire ll contains slag forming agents. Although the
Extended self shielded ux cored wire nozzle
9BOC Smootharc Advance II MIG 250C Operating manual
eciency diers by wire type and manufacturer it is typically between
75–85%.
Flux cored arc welding does, however, have the same drawback as solid
wire MIG in terms of gas disruption by wind, and screening is always
necessary for site work. It also incurs the extra cost of shielding gas, but
this is often outweighed by gains in productivity.
Self-shielded Operation
There are also self-shielded consumables designed to operate without
an additional gas shield. In this type of product, arc shielding is provided
by gases generated by decomposition of some constituents within the
ux ll. These types of wire are referred to as ‘self-shielded’.
If no external gas shield is required, then the ux ll must provide
sucient gas to protect the molten pool and to provide de-oxidisers and
nitride formers to cope with atmospheric contamination. This leaves less
scope to address performance, arc stabilisation, and process tolerance,
so these tend to suer when compared with gas shielded types.
Wire eciencies are also lower, at about 65%, in this mode of operation
than with gas-shielded wires. However, the wires do have a distinct
advantage when it comes to site work in terms of wind tolerance, as
there is no external gas shield to be disrupted.
When using self-shielded wires, external gas supply is not required and,
therefore, the gas shroud is not necessary. However, an extension nozzle
is often used to support and direct the long electrode extensions that
are needed to obtain high deposition rates.
2.3 Introduction to Metal Cored
Arc Welding (MCAW)
How it Works
Metal-cored arc welding (MCAW) uses the heat generated by a DC
electric arc to fuse metal in the joint area, the arc being struck between
a continuously fed consumable ller wire and the workpiece, melting
both the ller wire and the workpiece in the immediate vicinity. The
entire arc area is covered by a shielding gas, which protects the molten
weld pool from the atmosphere.
As MCAW is a variant of the MIG welding process there are many
common features between the two processes, but there are also several
fundamental dierences.
As with MIG, direct current power sources with constant voltage output
characteristics are normally employed to supply the welding current.
With metal-cored wires the terminal the ller wire is connected to
depends on the specic product being used. Some wires are designed
to run on electrode positive, others preferring electrode negative, and
some which will run on either. The work return lead is then connected
to the opposite terminal. Electrode negative operation will usually give
better positional welding characteristics. The output characteristics
of the power source can have an eect on the quality of the welds
produced.
The wire feed unit takes the ller wire from a spool or bulk pack, and
feeds it through the welding torch, to the arc at a predetermined and
accurately controlled speed. Normally, special knurled feed rolls are used
with metal-cored wires to assist feeding and to prevent crushing the
consumable.
Gas hose
Gas cylinder
Power source
Return cable
Continous wire
Wire feed unit
Power cable
Torch conduit
Welding torch
Workpiece
Arc
Earth clamp
Process Schematic Diagram for MIG / FCAW and MCAW
10
BOC Smootharc Advance II MIG 250C Operating manual
Unlike MIG, which uses a solid consumable ller wire, the consumable
used in MCAW is of tubular construction, an outer metal sheath being
lled entirely with metal powder except for a small amount of non-
metallic compounds. These are added to provide some arc stability and
de-oxidation.
MCAW consumables always require an auxiliary gas shield in the same
way that solid MIG wires do. Wires are normally designed to operate
in argon-carbon dioxide or argon-carbon dioxide-oxygen mixtures or
carbon dioxide. Argon rich mixtures tend to produce lower fume levels
than carbon dioxide.
As with MIG, the consumable ller wire and the shielding gas are
directed into the arc area by the welding torch. In the head of the torch,
the welding current is transferred to the wire by means of a copper alloy
contact tip, and a gas diuser distributes the shielding gas evenly around
a shroud which then allows the gas to ow over the weld area. The
position of the contact tip relative to the gas shroud may be adjusted to
limit the minimum electrode extension.
Modes of metal transfer with MCAW are very similar to those obtained in
MIG welding, the process being operable in both ‘dip transfer’ and ‘spray
transfer’ modes. Metal-cored wires may also be used in pulse transfer
mode at low mean currents, but this has not been widely exploited.
Modes of Metal Transfer
The mode or type of metal transfer in MIG welding depends upon the
current, arc voltage, electrode diameter and type of shielding gas used.
In general, there are four modes of metal transfer.
Modes of metal transfer with FCAW are similar to those obtained in MIG
welding, but here the mode of transfer is heavily dependent on the
composition of the ux ll, as well as on current and voltage.
The most common modes of transfer in FCAW are:
→ Dip transfer
→ Globular transfer
→ Spray transfer
→ Pulsed arc transfer operation has been applied to ux-cored wires
but, as yet, is not widely used because the other transfer modes are
giving users what they require, in most cases.
Dip Transfer
Also known as short-circuiting arc or short-arc, this is an all-positional
process, using low heat input. The use of relatively low current and arc
voltage settings cause the electrode to intermittently short-circuit with
the weld pool at a controlled frequency. Metal is transferred by the wire
tip actually dipping into the weld pool and the short-circuit current is
sucient to allow the arc to be re-established. This short-circuiting mode
of metal transfer eectively extends the range of MIG welding to lower
currents so thin sheet material can readily be welded. The low heat input
makes this technique well-suited to the positional welding of root runs
on thick plate, butt welds for bridging over large gaps and for certain
dicult materials where heat input is critical. Each short-circuit causes
the current to rise and the metal fuses o the end of the electrode. A
high short-circuiting frequency gives low heat input. Dip transfer occurs
between ±70-220A, 14–23 arc volts. It is achieved using shielding gases
based on carbon dioxide and argon.
Metal-cored wires transfer metal in dip mode at low currents just like
solid MIG wires. This transfer mode is used for all positional work with
these types of wire.
1 2 63 4 5
Time
Short circuit cycle Arcing cycle
Current (A)
Voltage (V)
1 Short circuit
2 Necking
3 Arc re-ignition
4 Arc established
5 Arc gap shortens
6 Short circuit
Schematic of Dip Transfer
11BOC Smootharc Advance II MIG 250C Operating manual
Globular Transfer
Metal transfer is controlled by slow ejection resulting in large,
irregularly-shaped ‘globs’ falling into the weld pool under the action
of gravity. Carbon dioxide gas drops are dispersed haphazardly. With
argon-based gases, the drops are not as large and are transferred in
a more axial direction. There is a lot of spatter, especially in carbon
dioxide, resulting in greater wire consumption, poor penetration and
poor appearance. Globular transfer occurs between the dip and spray
ranges. This mode of transfer is not recommended for normal welding
applications and may be corrected when encountered by either
decreasing the arc voltage or increasing the amperage. Globular transfer
can take place with any electrode diameter.
Basic ux-cored wires tend to operate in a globular mode or in a
globular-spray transfer mode where larger than normal spray droplets
are propelled across the arc, but they never achieve a true spray
transfer mode. This transfer mode is sometimes referred to as non-axial
globulartransfer.
Self-shielded ux-cored wires operate in a predominantly globular
transfer mode although at high currents the wire often ‘explodes’ across
the arc.
Spray Transfer
In spray transfer, metal is projected by an electromagnetic force from
the wire tip in the form of a continuous stream of discrete droplets
approximately the same size as the wire diameter. High deposition
rates are possible and weld appearance and reliability are good. Most
metals can be welded, but the technique is limited generally to plate
thicknesses greater than 6mm. Spray transfer, due to the tendency of
the large weld pool to spill over, cannot normally be used for positional
welding. The main exception is aluminium and its alloys where, primarily
because of its low density and high thermal conductivity, spray transfer
in position can be carried out.
The current ows continuously because of the high voltage maintaining
a long arc and short-circuiting cannot take place. It occurs best with
argon-based gases.
In solid wire MIG, as the current is increased, dip transfer passes into
spray transfer via a transitional globular transfer mode. With metalcored wires there is virtually a direct transition from dip transfer to spray
transfer as the current is increased.
For metal cored wire spray transfer occurs as the current density
increases and an arc is formed at the end of the ller wire, producing
a stream of small metal droplets. Often the outside sheath of the wire
will melt rst and the powder in the centre ows as a stream of smaller
droplet into the weld pool. This eect seems to give much better transfer
of alloying elements into the weld.
In spray transfer, as the current density increases, an arc is formed at
the end of the ller wire, producing a stream of small metal droplets.
In solid wire MIG this transfer mode occurs at higher currents. Fluxcored wires do not achieve a completely true spray transfer mode but
a transfer mode that is almost true spray may occur at higher currents,
and can occur at relatively low currents depending on the composition
of theux.
Rutile ux-cored wires will operate in this almost-spray transfer mode, at
all practicable current levels. They are also able to operate in this mode
for positional welding too. Basic ux-cored and self-shielded ux-cored
wires do not operate in anything approaching true spray transfer mode.
Large droplet
Splatter
Workpiece
Gas shroud
Wire
Shielding gas
Droplets
Weld
Workpiece
Schematic of Globular Transfer Schematic of Spray Transfer
12
BOC Smootharc Advance II MIG 250C Operating manual
2.4 Fundamentals of MIG, FCAW and MCAW
Welding Technique
Successful welding depends on the following factors:
1 Selection of correct consumables
2 Selection of the correct power source
3 Selection of the correct polarity on the power source
4 Selection of the correct shielding gas
5 Selection of the correct application techniques
a Correct angle of electrode to work
b Correct electrical stickout
c Correct travel speed
6 Selection of the welding preparation
Selection of Correct Consumable
Chemical composition
As a general rule the selection of a wire is straightforward, in that it
is only a matter of selecting an electrode of similar composition to
the parent material. It will be found, however, that there are certain
applications that electrodes will be selected on the basis of its
mechanical properties or level of residual hydrogen in the weldmetal.
Solid MIG wires are all considered to be of the 'low Hydrogen type'
consumables.
The following table gives a general overview of the selection of some of
the BOC range of MIG wires for the most common materials.
Common Materials Welded with BOC MIG Wire
Material BOC MIG Wire
AS2074 C1,C2,C3, C4-1,C4-2,C5,C6 BOC Mild Steel MIG Wire
BS3100 AW1,A2,A3 BOC Mild Steel MIG Wire
BS1504-430,480,540 BOC Mild Steel MIG Wire
ASTM A36,A106,EN8,8A BOC Mild Steel MIG Wire
Stainless Steel
Grade 304 BOC Stainless Steel 308LSi
Grade 309 BOC Stainless Steel 309LSi
Grade 316 BOC Stainless Steel 316LSi
Physical condition
Surface condition
The welding wire must be free from any surface contamination including
mechanical damage such as scratch marks.
A simple test for checking the surface condition is to run the wire
through a cloth that has been dampened with acetone for 20 secs. If a
black residue is found on the cloth the surface of the wire is not properly
cleaned.
Cast and Helix
The cast and helix of the wire has a major inuence on the feedability of
MIG wire.
If the cast is too large the wire will move in an upward direction from the
tip when welding and if too small the wire will dip down from the tip.
The result of this is excessive tip wear and increased wear in the liners.
If the helix is too large the wire will leave the tip with a corkscrew eect.
Typical Metal Transfer Mode
Process
Dip
Transfer
Globular
Transfer
Spray Transfer
Metal Inert Gas
(MIG)
✓ ✕ ✓
Flux Cored
(Gas Shielded)
✓ ✓ ✓*
Flux Cored
(Self Shielded)
✓ ✓ ✕
Metal Cored
✓ ✕ ✓
* Not True Spray
Cast
Helix
Cast – Diameter of the circle
Helix – Vertical height
Cast and Helix
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