16 gas selection for gas metal arc welding, Gas selection for gas metal arc welding -13 – Tweco FP-165 Mini MIG User Manual
Page 44
OpERATION
FIREpOwER Fp-125, 135, 165
Operation
4-13
Manual 0-5123
4.16 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
ER70S-X
Spray
Transfer
92% Argon
8% CO2
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 Note 1
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 Note 1
Short
Circuit
92% Argon
8% CO2
All Position
Welding
Good coalescence and bead contour. Good
mechanical properties.
Greater
than
3/32”
See Note 1
Spray
transfer
92% Argon
8% CO2
Flat & HV
Fillet
Reduces undercutting. Higher deposition rates
and improved bead wetting. Deep penetration
and good mechanical properties.
Greater
than
14 gauge
(.075”)
See Note 1
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 or
81% Argon
18% Helium
1 % 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
90% Helium
7.5% Argon
2.5% CO2 or
81% Argon
18% Helium
1 % CO2
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.
Note 1: Contact your Filler Metal Supplier for recommended filler metal for the base metal to be welded.
Table 4-3: Gas Selection GMAW