Of course, 409 stainless steel is weldable. It’s generally used in purposes like exhaust methods where welding is essential. The sole principle I understand that would make clear it, is that the air move article turbo is fairly lacking of pulses. So its like using Flowmasters over a flowbench. Past https://www.madanijayateknik.com/service/detail/as-round-bar-plate-sheet-stainless-steel-409-409l-409m-409cb-409ti