tsutt said it, do not try welding those alloys. There are methods for it though they are not for diy nor are they recommended for a structural part.
You did not say the thickness of the parts You want to weld but if You are learning welding and are joining sheet aluminum try oxygen/ acetlyne. For anything over .090 tig is recommended and so is experience! If the parts are over .250 You will probably want helium rather than argon and use dc. The salesmen at weld shops will tell You You can weld up to .375 with a 200amp torch and argon, this is possible only with lots of pre heating and not much fun. Anyone tells You different is not talking from experience just reading specs from a bogus book. good Luck! |