Hello, My son has a sorghum pan that is made of stainless steel. It has seams that were originally soldered. Some of these seams have begun to leak. We tried to re-solder with silver solder without any luck. Our plan now is to use a propane torch and stainless steel brushes to remove the solder and then weld with the proper wire and gas. Any thoughts and tips will be appreciated. This isn't T related, but the knowledge of you guys has amazed me for years. Thanks, Glenn in Middle Tennessee
Should be easy to silver solder. You need to mask off the area to be soldered and bead blast it. Use flux only on the areas where you want the solder to stick.
If you really have to MIG weld it then you need to again bead blast it enough to remove all traces of solder.
With what? Lead solder? Silver solder?
I don't think you can get it clean enough to weld once its been soldered. I know if it was brazed you can't and I suspect solder would be no different.
There may be some new technique or flux that I am not aware of but in all my years of welding I have never heard of a way to solder or braze stainless. The solder or braze does not stick well to stainless. That is probably why the joints are leaking. I would clean to bare metal and tig or stick weld the joints with stainless rods. The joint will be permanent and never leak again... Donnie Brown
I'm with donnie
You can solder stainless with 50-50 using a stainless liquid flux. We did it all the time where I worked. Steve
Nothing new about brazing SS. Use silver brazing rod not solder. (Actually, it's flat strips.) I used Safety-Silv to repair cracks on a SS Model A radiator cover and it worked great. The color was a good match too after polishing.
Here in Vermont, the making of maple syrup requires similar pans used over an evaporator. If you clean the pan up and get all the impurities off the area to be repaired, you can use 50/50 solder with acid flux to re-solder the repair. If you can use a 200 or 300 watt electric soldering iron, you can control the heat easier than with a torch. If you can't find acid flux, use muriatic acid cut with water in a glass container with some zinc slugs in the bottom. This is an excellent flux for stainless.
We tried silver solder and probably didn't have the proper flux. Could not get it to stick at all. Going to try cleaning it up well and mig welding it. Hope that works.