Effects of process time and thread on tensile shear strength of al alloy lap joint produced by friction stir spot welding

Mitsuo Fujimoto, Daisuke Watanabe, Natsumi Abe, Hiroyuki Kokawa, Yutaka Sato

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Friction Stir Spot Welding (FSSW) has been practically used to the construction of aluminum car-body in the automotive application. In this study, the weld strength and factors governing the weld strength in friction stir spot welded aluminum alloy 6061-T6 was examined. The weld strength increased with the process time during FSSW up to 3 s, beyond which it decreased. The fracture path changed from the lapped interface into the shoulder edge as the process time increased, and the maximum strength was obtained at the process time when the transition of the fracture path occurred. The cross-sectional microstructure depended on the threads on the probe surface, i.e. the elliptical zone was formed in the stir zone by the threads, but effect of the thread on the weld strength was hardly found. The present study suggests that the weld strength was strongly related with size of the well-consolidated region which was larger than the elliptical zone observed in the vicinity of the exit hole.

本文言語English
ページ(範囲)253-258
ページ数6
ジャーナルYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
26
4
DOI
出版ステータスPublished - 2008

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

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