I recently picked up a spool gun for my miller passport plus and I tried welding aluminium. When I welded a piece of aluminum I got a black soot around and sometimes on my weld. I did exactly what the guy at Airgas told me to do (use straight argon, clean parent metal with a stainless steel wire brush, and use the push method at a 45 degree angle). Most of the time I kept my gas flow at around 20-30cfh. I don't know what to do now, any tips?
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Mig Welding Aluminium