OM-278174 Page 70
10-15. Troubleshooting – Distortion
Distortion - contraction of weld metal during welding that forces base metal to move.
Illustration: Base metal moves in the direction of the weld bead.
Possible Causes Corrective Actions
Excessive heat input. Use restraint (clamp) to hold base metal in position.
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.
10-16. 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 devel-
oped over the years. The most commonly used shielding gases are listed in the following table.
Gas
Application
Spray Arc
Steel
Short Cir-
cuiting
Steel
GMAW-P
Steel
Spray Arc
Stainless
Steel
Short Cir-
cuiting
Stainless
Steel
GMAW-P
Stainless
Steel
Spray Arc
Aluminum
Short Cir-
cuiting
Aluminum
GMAW-P
Aluminum
Argon
All
Positions
All
Positions
All
Positions
All
Positions
Argon + 1%
O
2
Flat & Hori-
zontal Fillet
All
Positions
Flat & Hori-
zontal Fillet
Argon + 2%
O
2
Flat & Hori-
zontal Fillet
All
Positions
Flat & Hori-
zontal Fillet
Argon + 5%
CO
2
Flat & Hori-
zontal Fillet
All
Positions
Argon +
10% CO
2
Flat & Hori-
zontal Fillet
All
Positions
All
Positions
Argon +
25% CO
2
All
Positions
Argon +
50% CO
2
All
Positions
CO
2
All
Positions
Helium
All
Positions*
Argon +
Helium
All
Positions*
90% HE +
7-1/2% AR
+ 2-1/2%
CO
2
All
Positions
65% AR +
33% HE +
2% CO
2
All
Positions
* Heavy Thicknesses
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