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Mig Welding Stainless to mild steel


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You can use regular old mig wire (ER70 S2 or ER70 S6) and 75% argon 25 CO2, or even straight CO2, if your not concerned about corosion resistance. just weld it like regular steel,but with one difference. You need to be sure to shield the back side of the weld with shielding gas, or backing paste, if the stainless is thin enough for the weld to penetrate all of the way through the material. If the back side of the weld puddle is left unprotected (if air can get to it) and the weld penetrates all of the way through the material you will end up with a brittle (contaminated) weld that will not stand up to any abuse.

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