The AC/DC 225/125 is the same proven design as the renowned AC-225 arc welder, but adds a smoother, more stable DC welding arc. AC polarity welding is ideal for welding thick dirty metal. Use DC for better controlling the depth of your weld. Durable traditional design for long life. For use on the farm or ranch, at workshop or home. DC output range of 30-125 Amps - Use with electrodes up to 1/8 in. (3.2 mm) diameter. AC output range of 40-225 Amps - Use with electrodes up to 5/32 in. (4.0 mm) diameter. Fan cooled for extra thermal protection. Input power 230 volts. 3 year warranty. NEMA rated, UL listed and CSA approved.