Abstract: Compared with other power switcher,IGBT(insulated gate bipolar transistor) has rapider switch speed and collector current is more, collector to emitter saturation voltage is less so it is widely used in inverter welding machine. To improve welding machine reliability, present pulse control circuit for inverter is designed,which is based on the treatment for instantaneous signal of welding current. Rapid regulation without overshoot of welding current can be realized in the whole range of arc load. It can meet the requirement of varied welding process and ensure the performance reliability of inverter. The circuit also may be used in half-bridge, full bridge and single ended forward inverter.