Machine features:   Advanced inverter technology, multifunction function: AC / DC, MMA, AC / DC Pulse TIG   Comprehensive protection function: over current, over heat, over volts and under volts   Pulse performance Characteristics for welding thin plates, continuously controllable, beauty and luster of the joint, suitable for welding aluminum, magnesium and its alloys, low power consumption compared to other similar devices up to 75% Model TIG 250P Power Voltage (V) 220 Rated input current 20 No load voltage 42.55 Current range 10~250 Rated output volt 18 Efficiency (%) 85 Duty Cycle (%) 60 Power factor 0.73 Arc setup method HF Useable electrode 1.6~4 Instalation class F Protection class IP21S Weight (KG) 20