한국표면공학회지 (46권1호 36-41)
Characteristics of Friction Stir Welded AZ31 Mg Alloys with Shoulder Diameter and Rotating Speed
숄더 지름과 회전 속도에 따른 AZ31 마그네슘합금의 마찰교반접합 특성
전상혁;고영봉;박경채;
Jun, Sang-Hyuk;Ko, Young-Bong;Park, Kyeung-Chae;
경북대학교 금속신소재공학과;한국화학융합시험연구원;
Dept. of Materials Science and Metallurgy, Kyungpook National University;Korea Testing & Research Institute (KTR);
Friction stir welding (FSW) is a relatively new joining technique particularly for magnesium and aluminum alloys that are difficult to fusion weld. In this study, AZ31 Mg alloys were joined by FSW with shoulder diameter 11, 19 mm and rotating speed 900, 1200, 1500, 1800 rpm. The shoulder diameter and welding speed depended on the heat input during FSW process. As a result, the microstructures of stir zone were a fine grain by dynamic recrystallization. According to the larger shoulder diameter and the higher rotating speed, refined grain sizes of stir zone were grown by higher heat input, and the microhardness of stir zone was lower. The tensile strength at the shoulder diameter 19 mm, rotating speed 900 rpm was obtained maximum value. This value compared with the base metal was over 93%.
Friction Stir Welding (FSW);Shoulder diameter;Rotating speed;Heat input;
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