Can you mig weld stainless steel exhaust. But if your car has a stainless steel exhaust pipe then you better use small spool for stainless steel wire and use regular mig welder machine and this is how to mig weld stainless steel exhaust pipe. Stainless exhaust is sometimes made from 304 stainless but there are also quite a few exhaust components that use 400 series stainless like 409. Before starting welding wears hand gloves face mask apron as protection from spark and light. You d also get correct facts on how to use metal iner gas in welding any type of stainless steel plates you ve got. I was told by the pipe welder at work that you can get s s. Either way to get the best service and longest life out of a stainless steel exhaust system its important to weld stainless steel exhaust with a matching or at least similar filler metal not cheap carbon steel mig wire. You may ve recently gotten some inert gas welders under 1000 bucks and you d be keen to know if you can get stainless steel welded.