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I know 304 and 316 play nice together, they're common materials in performance exhaust systems.
316 is also the preferred rod for 304.
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The following 1 user Likes TomG's post:
PixMan (03-10-2015)
303 is generally considered unweldable because of its sulfur content. It may improve if joined with 316 due to mixing in the weld, but I wouldn't bet on it.
Tom
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What Tom said. I've never seen 303 successfully welded to anything.