FABRICATOR 281
Manual No. 0-4880B
4-1
OPERATION
4.09 Gas Selection for Gas Metal Arc Welding
Metal Type
Base Plate
Thickness
Filler Metal Transfer
Mode
Suggested
Shielding Gas
Welding
Positions
Comments
Carbon
Steel
Greater than 22
gauge (.030”)
ER70S-X
Short
Circuit
100% CO
2
All Position
Welding
High welding speeds. Good penetration
and pool control.
Greater than 22
gauge (.030”)
ER70S-X
Short
Circuit
75% Argon
25% CO2
All Position
Welding
Suitable for high-current and high-
speed welding.
Greater than 22
gauge (.030”)
ER70S-X
Short
Circuit
92% Argon
8% CO2
All Position
Welding
Higher deposition rates without melt-
through. Minimum distortion and
spatter. Good pool control for out-of-
position welding.
Greater than 10
gauge (1/8”)
ER70S-X
Spray
Transfer
92% Argon
8% CO2 or
minimum 98%
Argon 2% O2
Flat & HV
Fillet
Good arc stability, weld soundness, and
increasing width of fusion.
Low Alloy
and High
Alloy Steel
Greater than 22
gauge (.030”)
See * below
Short
Circuit
Globular
75% Argon
25% CO2
All Position
Welding
High welding speeds. Good penetration
and pool control. Applicable for out-
of-position welds. Suitable for high-
current and high-speed welding.
Greater than 22
gauge (.030”)
See * below
Short
Circuit
92% Argon
8% CO2
All Position
Welding
Good coalescence and bead contour.
Good mechanical properties.
Greater than
3/32”
See * below
Spray
transfer
92% Argon
8% CO2 or
minimum 98%
Argon 2% O2
Flat & HV
Fillet
Reduces undercutting. Higher
deposition rates and improved bead
wetting. Deep penetration and good
mechanical properties.
Greater than 14
gauge (.075”)
See * below
Short
Circuit
98% Argon
2% CO2
All Position
Welding
Good control of melt-through and
distortion. Used also for spray arc
welding. Pool fluidity sometimes
sluggish depending on the base alloy.
Stainless
Steel
Greater than 22
gauge (.030”)
ER308-X
ER309-X
ER316-X
Short
Circuit
90% Helium
7.5% Argon
2.5% CO2
All Position
Welding
Low CO
2
percentages in Helium mix
minimizes carbon pickup, which can
cause intergranular corrosion with
some alloys. Helium improves wetting
action and contour. CO
2
percentages
above 5% should be used with caution
on some alloys.
Greater than
3/32”
ER308-X
ER309-X
ER316-X
Spray
Transfer
81% Argon
18% Helium 1
% CO2 or 98%
Argon 2% CO2
or 2% O2
Flat & HV
Fillet
Good arc stability. Produces a fluid
but controllable weld pool, good
coalescence, and bead contour.
Minimizes undercutting on heavier
thickness.
Aluminum
Greater than 18
gauge (.045”)
ER4043
ER5356
Spray
Transfer
Argon
All Position
Welding
Excellent cleaning action. Provides
more stable arc than helium-rich
mixtures.
Summary of Contents for 281 FABRICATOR
Page 54: ...fabricator 281 OPERATION 4 18 Manual No 0 4880B NOTES ...
Page 80: ...Fabricator 281 CIRCUIT OPERATION 8 Manual No 0 4880B ...
Page 98: ...fabricator 281 APPENDIX A Manual No 0 4880B APPENDIX 4 SPOT TIMER CIRCUIT DIAGRAM Art A 07521 ...
Page 104: ...fabricator 281 APPENDIX A 12 Manual No 0 4880B ...
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