The Porosity Control Technology of Lap Joint Welding Using Continuous Wave Nd:YAG Laser of the Low Carbon Steel SS41

Abstract

ARTICLE INFO ABSTRACTArticle history:With the development of advanced processing technology, laser processing systems, which require high-quality precision processing, have attracted considerable attention. Although laser equipment is expensive, it enables quick processing and less deformation of materials. This technology is often applied to secondary batteries, which has thus farinvolved the use of argon tungsten inert gas (TIG) welding. However, the welding characteristicsof argon TIG welding are not yet good, and a laser is used for welding to address this problem. In this study, lap-joint welding was conducted, and the desired welding characteristicswere obtained when the laser power was 1800W and the laser beam travel speed was 1.8 m/min. Lap-joint welding was conducted on Ni-coated SS41. Two cases were compared. No poreswere observed in the Ni-coated SS41 lap-joint welding part, and cracks appeared from the lap-joints. Moreover, the pole rod and tap were welded together in a T-joint form to improve the output of the secondary battery. T-joint laser welding showed better welding characteristics than TIG welding. . 즉, 부품 자체에 변형이 적고, 좁고 깊은 용접단면 을 얻을 수 있다. 이를 바탕으로 최적의 용접공정 DB를 구축하여 가공생산성을 향상 시킬 수 있다 [6] . 이와 같은 이유로 레이저를 이용한 용접에 산업체에서 많은 관심