I botched up the edge of a stainless steel darkroom sink with a saw. Whoops. The cut into the edge is cosmetic, but really really ugly. I called the manufacturer of the sink to see how to best patch the cut which is a tad over 1/6" wide and about 5/8" long. It passes though a folded edge of what seems to be 3 layers of 24 guage stainless. I belive it's 304 but am not 100% sure, and forgot to ask.
I was told, yes it can be soldered and to use 50/50 lead/tin solder, any really active fluxes for stainless and do not use a torch as it will oxidize the metal.
Harris makes a liquid flux that seems to be fine for stainless. The issue is it seems people really like silver solder for stainless. Even the old timer at the local welding store seemed baffled by using 50/50 on stainless.
Obviously both can and do work. Any ideas on why one might use a silver solder vs the 50/50 stuff? Harris makes something called Stay-Brite solder which appears to be something close to or the same as silver solder or potable water stuff. Is it the same, or can plain lead free plumbing solder be used on stainless?