What shielding gas would be most appropriate to recommend for GMAW on stainless steel to maximize corrosion resistance of the weld?

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Multiple choice — select the best answer

A100% argon
B75% argon and 25% carbon dioxide
C90% helium and 10% argon
DArgon with 1-2% oxygen and 1-5% carbon dioxide

✓ Correct answer: D. Argon with 1-2% oxygen and 1-5% carbon dioxide A tri-mix of argon with 1-2% oxygen and 1-5% carbon dioxide provides the best combination of arc stability and corrosion resistance for stainless steel GMAW applications. The minimal $$CO_{2}$$ and $$O_{2}$$ content limits chromium oxidation while maintaining good arc characteristics.

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What shielding gas would be most appropriate to recommend for GMAW on stainless steel to maximize corrosion resistance of the weld?

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