자동차용 고강동 강판의 Nd:YAG 레이저 Stitch 용접에 관한 연구

Abstract

Application for laser welding have increased steadily in recent years due to its benefits such as high speed, high productivity and high density energy heat source. In this article these advantages of the laser welding has been considered for Nd:YAG laser stitch welding as a substitute for spot welding of lightweight car body plates. Optimized parameters for Nd:YAG laser stitch welding have been determined comparing the economical and mechanical characteristics to match with the currently used spot welding characteristics. A Finite Element based numerical comparison of thermal distribution in both the welding process has also been made in this study. Based on this calculated thermal history elasto-plastic thermal residual stress analysis has been carried out. The obtained numerical result are then compared with the experimentally measured value and found acceptable.