hotrdd
XS650 Junkie
Have a few pieces of aluminum that I want to MIG weld together. I've put the wire in the welder, reversed the polarity, turned on the gas and cranked up the voltage. But when I start welding the aluminum wire just melts and splatters all over without melting the thin aluminum tubing and without really welding at all. What am I missing? Do I need to preheat the aluminum first?