Wire Feeding Speed Control for Improving Welding Performances in Inverter Arc Welding Machine

In the conventional wire feeder drives of welding machine, one thyristor or MOSFET device was used for half-wave phase control circuit and direct EMF measurement was used for sensing the wire feed rate But the method using one switching device has poor response for sudden disturbance and it has latent speed ripple. It can affect some welding performance such as spatter generation and irregular bead formmmg. Therefore, the welding performance using full-bridge PWM speed control scheme was compared with conventional driving scheme and experimented in this paper. The results of experiment confirm the posibility of welding perfomance improvement by proposed constant speed control scheme in wire feeding drive of welding machine.