(3) ARC Machines Md 415 TIG Weld Power Supplies For Orbital Welding. 1999 ,Weld Current: 5 to 400 amps DC + 1% straight polarity 100% duty cycle, Arc Voltage Control: Range user-defined Max. 25 volts at torch @ 400 amps, Input Power: 230/460 VAG, 3 Phase 60 Hz. Also available: Large quantity 2800 lbs. of ERNiCrFe-7A surplus weld wire new still in original packing. ERNiCrFe-7A is a copper-nickel alloy based wire used on most low-alloy and stainless steel to provide a corrosion resistant overlay that is resistant to oxidizing acids.