Gas Selection For Gas Metal Arc Welding - Firepower FP 125 Operating Manual & Installation Manual

FIREPOWER FP 125,135,165

4.16 Gas Selection for Gas Metal Arc Welding

Base Plate
Metal Type Thickness Filler Metal
Carbon Greater than
Steel 22 gauge
(.030")
Greater than
22 gauge
(.030")
Greater than
22 gauge
(.030")
Greater than
10 gauge
(1/8")
Low Alloy
Greater than See Note 1 Short Circuit
and
22 gauge
High Alloy (.030")
Steel
Greater than See Note 1 Short Circuit 92% Argon
22 gauge
(.030")
Greater than See Note 1
3/32"
Greater than See Note 1 Short Circuit 98% Argon
14 gauge
(.075")
Stainless Greater than
Steel 22 gauge
(.030")
Greater than
3/32"
Aluminum Greater than
18 gauge
(.045")
Note 1: Contact your Filler Metal Supplier for recommended filler metal for the base metal to be welded.
OPERATION
Transfer Suggested
Mode Shielding Gas
ER70S-X Short Circuit 100% CO
ER70S-X Short Circuit 75% Argon
25% CO2
ER70S-X Short Circuit 92% Argon
8% CO2
ER70S-X Spray 92% Argon
Transfer 8% CO2
75% Argon
Globular 25% CO2
8% CO2
Spray 92% Argon
transfer 8% CO2
2% CO2
ER308-X Short Circuit 90% Helium
ER309-X 7.5% Argon
ER316-X 2.5% CO2 or
81% Argon
18% Helium
1 % CO2
ER308-X Spray 90% Helium
ER309-X Transfer 7.5% Argon
ER316-X 2.5% CO2 or
81% Argon
18% Helium
1 % CO2
ER4043 Spray Argon
ER5356 Transfer
Table 4-3: Gas Selection GMAW
Welding
Positions
All Position High welding speeds. Good penetration and pool
2
Welding
All Position Suitable for high-current and high-speed welding.
Welding
All Position Higher deposition rates without melt-through.
Welding Minimum distortion and spatter. Good pool control
for out-of-position welding.
Flat & HV Good arc stability, weld soundness, and increasing
Fillet
All Position High welding speeds. Good penetration and pool
Welding control. Applicable for out-of-position welds.
Suitable for high-current and high-speed welding.
All Position Good coalescence and bead contour. Good
Welding
Flat & HV Reduces undercutting. Higher deposition rates
Fillet and improved bead wetting. Deep penetration and
good mechanical properties.
All Position Good control of melt-through and distortion. Used
Welding also for spray arc welding. Pool fluidity sometimes
sluggish depending on the base alloy.
All Position Low CO percentages in Helium mix minimizes
2
Welding carbon pickup, which can cause intergranular
corrosion with some alloys. Helium improves
wetting action and contour. CO
above 5% should be used with caution on some
Flat & HV Good arc stability. Produces a fluid but controllable
Fillet weld pool, good coalescence, and bead contour.
Minimizes undercutting on heavier thickness.
All Position Excellent cleaning action. Provides more stable arc
Welding than helium-rich mixtures.
4-12
Comments
control.
width of fusion.
mechanical properties.
percentages
2
alloys.
Manual 0-5123