... alloy, alloy steel, carbon, steel, copper, titanium alloy.Excellent welding performance: 1. Square wave power supply with good quality, shot ... / Overheating / Overload / Phase-Lack Protection Systems to ensure the welding machine’s safety, durability and reliability .2. EMC electromagnetic compatibility ... power supply 220V/380V (wse250/315) worldwide universal.. square wave argon(arc) welding machine