... smooth cutting surface.3.MOSFET inverter and precision constant current feedback control technology, soft switch, DC output.4. ... Intensive arc, high cutting speed, narrow and smooth kerf, continuous current regulation, little distortion for work-piece, safety and reliable ... resisting.Technical Specification1.Primary input voltage:110V/220V2.Welding current:10-50Amp3.Power factor:0.934.Insulation class: ...