Abstract
Abstract The dissimilar welding between magnesium alloy and steel sheet was required in automobile industry to increase the strength of the dissimilar joints. Laser brazing is one of the good joining processes for Mg- steel dissimilar joint. In this study, the effect of coating materials was evaluated on the laser brazing for the dissimilar joint between AZ31 and coated steels such as Zn, Sn and Ni. Diode direct laser was used to braze the lap-edgejoint with Mg600 filler wire and Superior #21 flux. The wettability was best on Zn coated steel. The interlayer was formed at the interface between brazement and steel for all coating materials. The strengths of brazed specimen were 146.5N/mm, 204.6N/mm and 101.6N/mm for Zn, Sn and Ni coated steel respectively.Key Words : Mg alloy, Dissimilar joint, Coated steel sheet, Laser brazing, Diode direct laser 1. 서 론 마그네슘 합금은 중량 대비 강도가 높은 대표적인 경량구조용 소재이다 1) . 또한 주조성이 우수하여 엔진헤드커버, 오일팬 등의 자동차 부품에 널리 적용되고 있으며, 진동흡수능이 우수하여 고급자동차의 조향장치는 대부분이 마그네슘합금으로 제조되고 있다
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