I can't say that I know much about welding but this is a topic that comes up over and over on diffrent bicycle forums. One thing I have learned from reading these discussions is that a wire fed MIG seems the best way to go for bikes. The general concensus on TIG is that it is too powerful for the thin walled mild steel that our bikes are made out of...Kelly

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I'm racin' Spitfire, turnin', poppin' wheelies, burnin' evil chasin' pop,pop, pop,pop,pop.... (The Pixies-Tony's theme)