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I use Ruff-Stuff for a lot of my fabrication parts. Never had the first problem with themhttp://www.ruffstuffspecialties.com/catalog/BUMPER.htmlAs for the welder, you are definately pushing the limits of a Miller 211 in building a bumper. It looks to me like it can only burn a maximum of 1/4" steel. Several thoughts on thatFirst, 1/4" is pretty light for impact regions of a off road bumper, well, a combat vehicle bumper. It's pretty light for the winch box and the frame mounts. Having said that, I think you can get away with 1/4", although, you are on the edge. If you have a significant bump, it will bend and distort unless you have it boxed pretty well. I like 3/8" for the mounts and the winch box and the support for the wingsSecondly, Take a look at the duty cycle of that machine when burning the thicker steels. Probably isn't very longNext, a 15 Amp breaker is usually mated to wire rated to carry a 15 amp load. You could theoretically install a 100 amp breaker on that same wire, but the wire would be totally overcome with the additional amperage, and heat up and melt. That is what causes house fires in some cases.I'd say that if you are now getting into building bumpers, then why not just run a 50 amp, 230 volt circuit (If possible) and be done with it. That circuit will handle a miller 212, which I use which will burn pretty much anything you encounter with building trucks.Just some thoughts for you to consider. We don't want to see you lose your home over a bumper!
Perfect solution! When the house sells, the new owner will already have a 50A 240v connection for their welder, compressor, tanning bed, kiln or whatever other needs they might have! :) Value-add right there! Probably $50 in material for the breaker and box/wire/plug that stays with the house. The extension cord will cost a bit more, but you get to keep it. Win/Win!