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http://dx.doi.org/10.5781/KWJS.2011.29.6.676

Influence of Welding Parameters on Macrostructure and Mechanical Properties of Friction-Stir-Spot-Welded 5454-O Aluminum Alloy Sheets  

Choi, Won-Ho (Technical Research Laboratories, Shin Young Co., Ltd.)
Kwon, Yong-Jai (School of Materials Science and Engineering, University of Ulasn)
Yoon, Sung-Ook (School of Materials Science and Engineering, University of Ulasn)
Kang, Myoung-Soo (School of Materials Science and Engineering, University of Ulasn)
Lim, Chang-Yong (Technical Research Laboratories, Shin Young Co., Ltd.)
Seo, Jong-Dock (Technical Research Laboratories, Shin Young Co., Ltd.)
Hong, Sung-Tae (School of Mechanical Engineering, University of Ulasn)
Park, Dong-Hwan (Institute of E-Vehicle Technology, University of Ulasn)
Lee, Kwang-Hak (School of Materials Science and Engineering, University of Ulasn)
Publication Information
Journal of Welding and Joining / v.29, no.6, 2011 , pp. 56-64 More about this Journal
Abstract
Friction stir spot welding between 5454 aluminum alloy sheets with the different thicknesses of 1.4 and 1.0 mm was performed. In the welding process, the tool for welding was rotated ranging from 500 to 2500, and plunged to the depth of 1.8 mm under a constant tool plunge speed of 100 mm/min. And then, the rotating tool was maintained at the plunge depth during the dwell time ranging from 0 to 7 sec. The pull-out speed of the rotating tool was 100 mm/min. The increase of tool rotation speed resulted in the change of the macrostructure of friction-stir-spot-welded zone, especially the geometry of welding interface. The results of the tensile shear test showed that the total displacement and toughness of the welds were increased with the increase of the tool rotation speed, although the maximum tensile shear load was decreased. However, the change in the dwell time at the plunge depth of the tool did not produce the remarkable variation in the macrostructure and mechanical properties of the welds. In all cases, the average hardness in friction-stir-spot-welded zone was higher than that of the base metal zone. By the friction stir spot welding technique, the welds with the excellent mechanical properties than the mechanically-clinched joints could be obtained.
Keywords
Friction stir spot welding; Aluminum alloy; Tool rotation speed; Dwell time; Macrostructure; hardness properties; Tensile shear properties;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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