When ever I see a forge with heated with a torch I think of how expensive the tanks are and how quickly they empty. Whatever you use for a body of the forge you will need to have a blown or venturi burner on it supplied by at least a 25# tank. Those torches will just about get a blade done and then run empty. I know-been there, done that, have a bunch of empty tanks stacked in the corner that have turned into a disposal problem.
Doug
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