i have a friend who has welded several tanks. i thought i would have to fix one so asked him his way. he takes a shop-vac and sucks out, and an air line from the compressor going in the sending unit hole. then, after it "smells" clean, he puts his extra argon tank with an old hose from an old welder pumping argon into it while he welds it. i dont know why it wouldnt be ok to just leave either the shop-vac, or an air line blowing in while you weld. it takes a certain amount of fumes to be flamable, and once they are gone, thereaint enough left. dave stohler
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