In Reply to: Lincoln AC/DC welder posted by OHIO5150 on November 18, 2012 at 18:14:17:
Just for the heck of it I will add a bit from an adult welding career. For a farm welder, an AC is good enough. A DC welder won't usually weld around a corner without pulling the bead in one direction or another...AC won't do that. You can also get a carbon arc torch to heat a nut or bolt red hot to help remove a stuck one, DC will do it but, I use the AC cause it is better. Search on ebay for one or a yard sale. If a tombstone Lincoln weighs only 35/40 pounds, it has aluminum windings in it, try to find an older one that has the copper windings. Weld some with the used welder at high amperage and then get your nose right down in it's exhaust air flow and smell and if it smells like transformer stink, pass on it. The older 180's didn't have an exhaust/cooling fan, I wouldn't recommend one of them. The 75 amp setting with the circle around it is 100% duty cycle for thawing pipes with. I saw a video of a mig or tig welder ( don't remember which )welding a piece of aluminum foil together and two razor blades, real neat! DC will weld thinner metal than AC as you have better control. If you go for the AC machine, get some of the AC 7018 rod, it'll weld mild steel or alloy steel and generally do a better job. If you weld a lot of old rusty/greasy metal be sure and get some 6011 rod. If you have trouble starting AC, lay a piece of scrap steel next to your welding area and start the weld on it and move over to the piece that you're going to weld. I had an Lincoln Idealarc 250/300 AC/DC welder that I bought a high frequency rig for and set beside it and a bottle of Argon and welded aluminum for years with it...on AC. Thats about all I can think of, hope it helps someone. Today I have an AC/DC Airco Bumble Bee that is as tough as they come and a Miller that goes up to 460 amps with a tig setup on it. I only gave $400 for it, look around, they're out there. Best is to go to a Fab shop that is selling out. ohfred41
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