... Multi-function dc/ac inverter square wave welding machine 1.DC,AC,MMA, ... weld operation Multi-function dc/ac inverter square wave welding machine TIG200PACDC:welding style: DC TIG,AC ... load loss is small;precise control system: PWM pulse width modulator,closed loop control system to ensure the ... stable;excellent welding performance: 1. quality square wave power supply,current zero-crossing time is short, ...