... Description Name: WSM series Inverter DC pulse argon arc welder Elements: IGBT inverter, DC, Pulse ModelWSM-315WSM-400Input voltage(V)3-phase ... frequency (can reach to 15K HZ) AC through large power switch IGBT, and reduce voltage and rectify into DC again, output ... or descending time, and gas-lag time. In addition, pulse frequency and pulse duty factor can be adjusted alone. Its automatically arc ...