AT-100SP ARC-TIG Inverter. Easily welds most DC mild steel, stainless steel, and cast-iron electrodes form 1/16" to 3/32". Features a unique hot start w/ steady non-stick arc control that resists fluctuations in electrical current. Scratch start. 100 Amp DC power source. Main voltage: 110V. Max open voltage: 70V. Duty cycle: 35% @ 85A, 60% @ 65A, 100% @ 50A. Output range: 10A - 100A. Elecrode diameter: 1/16" - 3/32". Internal cooling fan. Weight: 6.2 lbs.