A Study on the Laser Weldability of Aluminized Steel Sheet with Coating Condition

도금조건에 따른 알루미늄도금강판의 레이저 용접성에 관한 연구

The aluminized steel sheet exhibits excellent resistance to oxidation and corrosion, and can substitute for stainless steel or heat-resisting steel in some situations. Furthermore it has wide applications, owing to its low cost and excellent performance, in the petrochemical industry, electric power, other energy conversion system, etc. and has attracted the attention of many investigators. Laser welding is a remarkably advantageous method for welding of thin sheets and surface-treated steel sheets since the method requires less heat input, and it is suitable for high-speed welding. In this study, thus, the laser weldability of aluminized steel sheet was investigated. As the result from the study, there is an Al-rich zone in a welded part which has decreased the welding strength due to the intermetallic compounds in the Al-rich zone.