Happily welded the Mercury grille together (ss tubing and ms brackets) with my MIG.
In industry it would be about weld performance and contamination issues. Use the right machine, wire, gas etc and it should be no issue.
https://www.millerwelds.com/resources/article-library/welding-stainless-steel-tube-and-pipe-maintaining-corrosion-resistance-and-increasing-productivity