Effects of interfacial microstructures on joint strength in friction stir spot welded 6061 aluminum alloy/zinc coated steel joints

DOI Web Site 1 Citations
  • Yamamoto Masaki
    Division of Materials and Manufactureing Science, Graduate school of Engineering, Osaka University
  • Ogura Tomo
    Division of Materials and Manufactureing Science, Graduate school of Engineering, Osaka University
  • Ohashi Ryoji
    System technology Development Center, Corporate technology Division, Kawasaki Heavy Industries Ltd.
  • Fujimoto Mitsuo
    System technology Development Center, Corporate technology Division, Kawasaki Heavy Industries Ltd.
  • Hirose Akio
    Division of Materials and Manufactureing Science, Graduate school of Engineering, Osaka University

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Other Title
  • 6061アルミニウム合金/亜鉛めっき鋼の摩擦撹拌点接合における 界面組織が継手強度に及ぼす影響
  • 6061 アルミニウム ゴウキン/アエンメッキ コウ ノ マサツ カクハンテン セツゴウ ニ オケル カイメン ソシキ ガ ツギテ キョウド ニ オヨボス エイキョウ

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Abstract

The interfacial microstructures and joint strength of friction stir spot welded 6061 aluminum alloy<tt>/</tt>zinc coated steel joints were investigated using scanning electron microscopy <tt>(</tt>SEM<tt>)</tt>, a tensile shear test and a micro-tensile shear test. As tool rotation speed or tool load increased, the joint strength increased to be over 5000 N in shorter process time, which was almost the same strength with plug fracture of the joint. The observation of the cross section and the fracture surface of joints showed that fracture mode of the joint was classified into three regions; region 1 of the center-jointed region, region 2 of the liquation cracking of aluminum-zinc region, and region 3 of the circumference-jointed region. The micro-tensile shear test was also performed in order to evaluate the strength at each region by preparing the samples wire-cut from several regions of the joint. The micro-tensile shear test revealed that region 2 causes the decrease of the joint strength.

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