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http://dx.doi.org/10.5781/KWJS.2010.28.6.070

A Study on the Weldability and Mechanical Characteristics of Dissimilar Materials Butt Joints by Laser Assisted Friction Stir Welding  

Bang, Han-Sur (Dept. of Naval Architecture & Ocean Engineering, Chosun University)
Bang, Hee-Seon (Dept. of Naval Architecture & Ocean Engineering, Chosun University)
Kim, Hyun-Su (Dept. of Naval Architecture & Ocean Engineering, Graduate School, Chosun University)
Kim, Jun-Hyung (Dept. of Naval Architecture & Ocean Engineering, Graduate School, Chosun University)
Oh, Ik-Hyun (Automotive Components Center, Korea Institute of Industrial Technology(KITECH))
Ro, Chan-Seung (Dept. of Naval Architecture & Mechanics, Chosun University College of Science and Technology)
Publication Information
Journal of Welding and Joining / v.28, no.6, 2010 , pp. 70-75 More about this Journal
Abstract
This study intends to investigate the weldability and mechanical characteristics of butt weld joints by LAFSW for dissimilar materials (Al6061-T6 and SS400). At optimum welding conditions, the tensile strength of dissimilar materials joints made by FSW is found to be lower than that of LAFSW. Due to the increase in plastic flow and formation of finer recrystallized grains at the TMAZ and SZ by laser preheating in LAFSW, the hardness in LAFSW appeared to be higher than that of FSW. Compared with FSW, finer grain size is observed and elongated grains in parent metal are deformed in the same direction around the nugget zone in TMAZ of Al6061-T6 by LAFSW. Whereas, at weld nugget zone, coarse grain size is appeared in LAFSW compared to FSW, which is owing to more plastic flow due to laser preheating effect. In dissimilar materials joints by LAFSW, ductile mode of fracture is found to occur at Al6061 side with fewer brittle particles. Mixed mode of cleavage area and ductile fracture is observed at SS400 side.
Keywords
LAFSW(Laser assisted FSW); Dissimilar materials butt joints;
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  • Reference
1 M. Merklein, A.Giera : Laser Assisted Friction Stir Welding of drawable steel-aluminium tailored hybrid, International, Journal of Material Forming (2008)
2 Hidetoshi Fujii, Takahiro Tatsuno, Takuya Tsumura : Hybrid Friction Stir Welding of Carbon Steel Material Science Forum, 580-582 (2008), 393-396   DOI
3 K.Kimapong, T.Watanabe : Friction Stir Welding of Aluminum Alloy to Steel, Welding journal, (2004), 277-282
4 천창근, 김특기, 김흥주, 장웅성 : 마찰교반용접을 이용한 알 루미늄합금과 아연도금강의 이종접합, RIST 연구논문집, 22-4 (2008), 254-258 (in Korean)