Easy-to-Use, Ready-to-Weld.The Handler 125 is a reliable constant-voltage DC welder with built-in wire feeder that operates on common 120-volt power. It comes ready to weld, without shielding gas, using .030-.035 in. (0.8-0.9 mm) self-shielding flux-cored wire. It can weld 24-gauge to 3/16 in. steel with flux-cored wire. This welder is equipped with a factory-installed gas solenoid. With the addition of an optional regulator and shielding gas, you're ready to MIG weld with .023-.030 inch (0.6-0.8 mm) solid wire in the traditional 2-knob control mode. Use C-25 gas (75% argon/25% CO2) on 24 gauge-1/8 in. steel for a cleaner weld with less spatter. Use Tri-Mix gas and stainless wire for welding on 18-12 gauge stainless steel.