If you searched for "How to TIG Weld Stainless" you are in the right place.
This video shows tips for tig welding Stainless steel coped tubes along with some tips for purging stainless steel.
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There are some best practices for TIG welding stainless steel that apply to nearly every situation.
1. Practice the 3 c's of tig welding stainless steel
What that means is make sure the edges are free from plasma dross,
remove all tape residue, glue, adhesive, oil, etc.
some stainless steel sheet comes with a peel coat and once that peel coat is removed, all that is needed is a solvent wipe.
clean the filler rod too
The Stainless Steel manifold welded in this video is a great example of purge requirements.
Sometimes an argon purge is completely needed.
other times, a copper or aluminum backing is the way to get the job done.
This stainless steel manifold did not really required an argon purge so I used aluminum for backing to prevent distortion as well as severe oxidation also known as sugaring.
The final welds were purged in case I accidentally penetrated all the way thru.
Outside corner welds were made using an aluminum angle bar.