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My friend wants me to weld up a stainless pan that he will use to heat maple sap for syrup can I use silver solder or should I stick to 309 stainless?
Is it a old pan? Maple equipment until recently has been soldered. for a time after the lead scare, manufacturers used Silvabright Solder, a lead free solder. I would expect repairs on previously soldered pans to be difficult using TIG. We solder with a soldering copper and liquid flux. Never heat the pan with a torch!
Modern pans are TIG welded, they use machined backer pieces to hold, back purge, and draw excess heat away from the heat affected zone.
I would consider building a pan from copper. As a teenager I built several evaporators from 275 gallon oil tanks with galvanized steel pans. I'm not aware of anyone suffering any medical problems.
Twentieth Century 295
Twentieth Century 295 AC
Marquette spot welder