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http://dx.doi.org/10.5762/KAIS.2016.17.10.280

Evaluation of Mechanical Properties of Extruded Magnesium Alloy Joints by Friction Stir Welding : Effect of Welding Tool Geometry  

Sun, Seung-Ju (Dept. of Railway System Engineering, University of Science and Technology)
Kim, Jung-Seok (Advanced Materials Research Team, Korea Railroad Research Institute)
Lee, Woo-Geun (Dept. of Railway System Engineering, University of Science and Technology)
Lim, Jae-Yong (School of Mechanical Engineering, Daegu University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.17, no.10, 2016 , pp. 280-288 More about this Journal
Abstract
This study proposes improved welding tools for magnesium alloys. Two types of tools were used for friction stir welding (FSW). The effect of the welding tools on the FSW joints was investigated with a fixed welding speed of 200mm/min and various rotation speeds of 400 to 800 rpm. After FSW, the joints were cross-sectioned perpendicular to the welding direction to investigate the defects. A tensile test and Vickers hardness test were conducted to identity the mechanical properties of the joints. Defects were observed when the rotation speed was 400 rpm, regardless of the welding tool, and the amount of defects tended to decrease with increases in rotational speed. Defect-free welds were obtained when the rotation speed was 800 rpm. The best weld quality was acquired using the C type welding tool. The rotation speed of 800 rpm and welding speed of 200 mm/min produced the best joining properties. The ultimate tensile strength, yield strength, and elongation of the welded region were 90.0%, 69.1%, and 83.2% those of the base metal, respectively.
Keywords
Friction Stir Welding; Magnesium Alloys; Micrography; Mechanical Properties; Tool Geometry;
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