The Auto Arc 130 operates off 115-volt house hold current. It comes ready to weld, without shielding gas, using .030-.035 in. (0.8-0.9 mm) flux cored wire. For greater versatility, the Auto Arc 130 includes a gas valve for welding with.023?.030 in. (0.6-0.8 mm) solid wire and gas shielding. Use C-25 gas (75 Argon/25 CO2) on 22 gauge 1/8 in. steel for a cleaner weld with less spatter. Use Tri-Mix gas and stainless wire for welding on 16 gauge?1/8 in. stainless steel.