Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Influence of Welding Parameters on Macrostructure and Mechanical Properties of Friction-Stir-Spot-Welded 5454-O Aluminum Alloy Sheets

마찰교반점접합한 5454-O 알루미늄합금 판재의 접합부 거시조직 및 기계적 특성에 미치는 접합인자의 영향

  • 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)
  • 최원호 ((주)신영 기술연구소) ;
  • 권용재 (울산대학교 공과대학 첨단소재공학부) ;
  • 윤성욱 (울산대학교 공과대학 첨단소재공학부) ;
  • 강명수 (울산대학교 공과대학 첨단소재공학부) ;
  • 임창용 ((주)신영 기술연구소) ;
  • 서종덕 ((주)신영 기술연구소) ;
  • 홍성태 (울산대학교 공과대학 기계공학부) ;
  • 박동환 (울산대학교 자동차선박대학원) ;
  • 이광학 (울산대학교 공과대학 첨단소재공학부)
  • Received : 2011.04.19
  • Accepted : 2011.10.31
  • Published : 2011.12.31
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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.

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References

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