Y'all mind another keyboard hunter?? I have had, for quite a few years, an Airco line welder, 225 amps, 20% duty cycle, operated from a forty amp breaker....and believe me, it aint enough breaker...... have put up with it, sheer stupidity, I guess, and have welded up to inch and a quarter stock, multiple passes, using E6011, one eigth inch rod, a rod and half at a time....because otherwise, I would trip the breaker.... since have purchased a 200 AMP Lincoln, DC welder, 1955, so that means before aluminium wiring. Thingy is right on, on all his suggestions, IMHO. Sometimes one can find an excelent welding handbook from one of the welder maufacturers, that covers the basics quite well, with pics. Hope you don't mind my intrusion, have just found this site, and think it quite unique. Have a good one, R.