TIG Welder For Material Type Aluminum Stainless Steel Steel For Maximum Material Thickness 1/4 in (Aluminum) 1/4 in (Steel) For Minimum Material Thickness 0.020 in (Aluminum) 0.020 in (Steel) Input Frequency 50/60 Hz Max Input Current 20.5 A @ 115V AC (Single-Phase) Phase Single-Phase Polarity AC/DC Series Syncrowave 210 Stick Welding Maximum Output Current 150 A Stick Welding Minimum Output Current 20 A