Quality TIG welding on aluminum, stainless or steel and precise welding of thinner-gauge materials * Will do 1/4" aluminum and 3/8" mild steel and 110/220 volts and is capable of welding 7018, 6013 * Advanced Inverter Technology with PWM (Pulse Width Modulation) Using IGBT technology * Square-wave inverter 4 aluminum welding with pulse frequency allowing for simple set up and operating * Unit features HF start tig and includes a foot pedal for great tig welding control and Operation * Square-wave inverter 4 aluminum welding with pulse frequency allowing for simple set up and operatin * will do 1/4" aluminum and 3/8" mild stee and 110/220 volts and is capable of welding 7018, 6013