According to the characteristics of arc welding with filler wire, experiments about the FCAW-CO_2 and SAW which is commonly used in steel bridge welding were carried out.

The paper introduces the dynamic characteristic and the structure of arc welding power, and gives a method of designing arc welding power which using DSP chip as a controller.

This paper introduces a novel PWM welding inverter with Zero-Voltage-Switching (ZVS) and Zero-Current-Switching (ZCS) phase shift full bridge.