How do 304 stainless steel and 316 stainless steel weld to each other? I am hoping my medical device prospect will be able to weld a component made in 316 SS via metal injection molding toa 304 SS tube.

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Both are austenitic stainless so, yes they can be easily welded but, and this is a big but, they can and are very different animals. You have not provided much information on the 304 and 316 alloys. 304 is a very common alloy that has a very wide range of compositions, this is like asking for a Chevy where you can get either a corvette or a fiesta. 316 is a little closer range of alloys but there are 316L, 316LN, 316F etc.
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