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AC/DC TIG250 Inverter TIG Welder Aluminum TIG Welding Machine. AC/DC dual mode: DC for steel/stainless/copper/nickel, AC specially for aluminum & magnesium alloy welding. Wide current 5~250A, dual input 110-120V/220-240V 50/60Hz for global market use. Dual ignition: High Frequency start & Lift TIG start, match different operating habits. Adjustable pre-flow & post-flow shielding gas, use 1.0~3.2mm tungsten electrode with 99.9%+ purity argon. Full safety design: thermal overload, overvoltage and overcurrent protection for long time stable work.