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We used argon gas in our oven so no decarb Dave. I was a TIG welder, Tungsten Inert Gas. I just hooked the oven up and filled it with -1 CFM of Argon. Only time we used foil was when somebody else did the HT, but I meant brush after temper during cool down. I sometimes welded with Helium for a much hotter weld like for thick aluminum as the plasma field around the electric arc would be much hotter than around Argon. It also changed the appearance of the weld. We used an old cook oven for tempering below 500 degrees that had a special thermometer in it for accuracy.
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