Re: Is the millermatic challenger 172 a decent MIG welder?
Air Arcing....what fun, I have used 1/16" carbon rods to arc out 5/8" bolts to using 1/2" carbon rods on a 1500 amp Miller to arc out 7" thick cracks in slag pots. This tool goes along with the saying "Sometimes you have to destroy it before you can save it", very useful tool and sometimes better than a torch but not very useful for home. Any cutting done on a jeep or other similar metals of the same thickness is better performed with a grinder, torch or if you are so lucky to have one, a plasma cutter. Plasma cutters also need a good supply of air for the cutting process, just like air arcs, but the cuts are clean, crisp and won't warp the metal because the concentration of heat used in the cutting process is less than that used with a torch or air arcing. For general overall use you can't go wrong with a torch, if you have the money and space then a plasma cutter is a great addition to any shop, right after you buy a good mig machine.