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JWJ > Volume 29(6); 2011 > Article
Journal of KWJS 2011 December;29(6) :56-64.
Published online January 20, 2012.
Influence of Welding Parameters on Macrostructure and Mechanical Properties of Friction-Stir-Spot-Welded 5454-O Aluminum Alloy Sheets
Won-Ho Choi, Yong-Jai Kwon, Sung-Ook Yoon, Myoung-Soo Kang, Chang-Yong Lim, Jong-Dock Seo, Sung-Tae Hong, Dong-Hwan Park, Kwang-Hak Lee








Correspondence:   Published online January 20, 2012
ABSTRACT
  Friction stir spot welding between 5454 aluminum alloy sheets with the different thicknesses of 1.4 and 1.0 ㎜ 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 ㎜ under a constant tool plunge speed of 100 ㎜/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 ㎜/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
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