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Date 03-18-2005 15:14
304 stainless is susceptable to sigma phase at high heat. The preferred gas for welding stainless MIG is a 98-2, meaning 98%argon and 2% oxygen. C-25 is not designed for welding stainless, whether it is stainless to stainless or stainless to mild steel. Too much carbon in the gas will adversely affect the strength and corrosion resistance.