[metromizer]

I saw a offroader's welding rig at a machine tool show that was quite clever... it used a Makita cordless drill to drive a flux core wire feed spool gun, and an engine mounted alternator for welding current. The guy did an on-site demo and made some decent welds on 1/16" -3/16" thick steel

edit: It was a special alternator, maybe higher voltage, could have even been a DC generator for all can remember.