Field test results and application experience show that thyristor-controlled arc-suppression coils are of quick response, small residual current and good service effects.

Microcomputer controlled arc welding inverter power source can raises greatly controlled level of pulse MIG welding for its flexible control, high accuracy, high system response.

In this research works, the authors, using the optical welding robot, have controlled arc for improving the welding quality. The control system consists of TV-camera, micro-computer and image memory.