... perfect welding joint -Protective function WSM Series Inverter DC Pulse Argon Arc Welder Product features-Full bridge inversion soft-switching ... full digital control;-DC manual welding, DC TIG welding, pulse TIG welding, high universality;-2-step, 4-step ... function selection, welding-related parameters are all adjustable;-Slow pulse rising/descending and constant current rising/descending;-DC manual ...