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Yup... I can't remember the exact temperature, but Stainless steel ceases to be stainless when you weld it and must be passivated. That's why the only real cure is to grind it all out and passivate. That nice shiny finish we see is simply polished oxidized chromium with a very stable molecular bond that will not allow futher penetration of O2. The off-angle TC bung is yet another bit of major welding incompetence.If I remember my metallurgy course from eons ago, I think that a bad weld on ss can bring iron to the surface. Once it's there, it's there to stay, as @SpikeBrewing pointed out upthread. Removing the oxidation just means there's still exposed iron to rust again and again.
