In this study, the mechanical characteristics with micro structure were analyzed on the butt joint of AZ60 magnesium material extruded by GMAW and GTAW processes. As the result of tensile test, the fracture in the welding joint area happened at both processes and seemed to be brittle fracture. The yield strength of GMAW was 84.29% and GTAW was 60.43% as compared with base metal. The yield strength of GMAW was higher 23.86% than that of GTAW. The result of decreased micro hardness was indicated at both processes. The value of minimum micro hardness in FZ at GMAW was Hv 46.7 and GTAW was Hv 43.6 as compared with base metal. The value of minimum micro hardness at GMAW process was higher 5.64 % than that at GTAW process. The size of grain boundary at GMAW process in HAZ is smaller than that at GTAW process. GMAW process is more superior than GTAW process from the productivity and quality in case of automatic welding for magnesium alloy such as the automobile seat frame.

• 김부민(Graduate school of Technology & Convergence, Kongju National University) | Boo-Min Kim
• 김인규(Department of Automation Industrial Installation, Korea Polytechnics IV) | In-Gyu Kim
• 이한섭(Graduate school of Mechanical Engineering, Kongju National University) | Han-Seop Lee
• 박상흡(Division of Mechanical & Automotive Engineering, Kongju National University) | Sang-Heup Park Corresponding Author