... , fast recovery Rectifier module etc high frequency devices, implementation of " AC-DC -AC - DC " transform ; the machine use no source power factor correction, power ... welding machinewithpulse,constantpressurethesetwo welding ways, In addition there has thehandarc,TIG,carbon- arcgougingthreekinds ofweldingmethods. Pulseweldingmethodcanachievecarbonsteel, stainless steel,aluminum, alloy, copper and ...