TIG Welder, For Material Type Steel, For Maximum Material Thickness 3/8 in (Aluminum), 3/8 in (Steel), For Minimum Material Thickness 0.004 in (Steel), 0.012 in (Aluminum), Input Frequency 50/60 Hz, Phase Single-Phase, Polarity DC, Series Invertec V155-S, Stick Welding Maximum Output Current 155 A, Stick Welding Minimum Output Current 5 A