저항용접에서 입열량과 통전시간이 용융효율에 미치는 영향에 관한 연구

Abstract

The resistance welding processes are widely used in sheet metals, because welding time is short and operation is simple and has been used for many years as a reliable technique for joining pressed steel sheet. Recently many studies on the melting efficiency in arc welding have been carried on, and their results contribute to reduce angular distortion. But there has been no study on the melting efficiency in resistance welding yet. In this study, the melting efficiencies of Single phase AC and Inverter DC with same heat input were compared, the melting efficiency according to the welding time with same heat input was calculated in order to evaluate the effect of welding time on the melting efficiency, and the melting state of joint was captured by high speed camera. The result of high speed camera shooting shows a great difference in the temperatures changes of nugget along with current waveform in single phase AC power source, while they were not so intense in inverter DC power source.