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JI Shude, WANG Yue, MA Lin, CHAI Peng, GAO Shuangsheng. Effect of refill time on fracture feature of refill friction stir spot welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(5): 40-43. DOI: 10.12073/j.hjxb.20170509
Citation: JI Shude, WANG Yue, MA Lin, CHAI Peng, GAO Shuangsheng. Effect of refill time on fracture feature of refill friction stir spot welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(5): 40-43. DOI: 10.12073/j.hjxb.20170509
shu

Effect of refill time on fracture feature of refill friction stir spot welding

  • 1.

    Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China

  • 2.

    School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China

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  • Received Date: June 16, 2015
    Graphical Abstract
    • Abstract
  • In order to investigate the effect of refill time on fracture mode and fracture mechanism on refill friction stir spot welding (RFSSW), the LY12 aluminum alloy plates with the thickness of 1.5 mm and 2.0 mm were welded and then the tensile-shear experiments were performed. Under shorter refill time, the atom diffusion effect at the interface between sleeve stir zone and thermo-mechanically affected zone is poor and the crack may appear near the top surface of upper plate, which results in the shear-plug fracture mode. When the refill time is long enough, the crack mainly propagates along the interface between the upper and lower plates, which causes the shear fracture of RFSSW joint. Moreover, microstructure, microhardness and fracture morphology can all verify the illustration about the fracture mechanism of RFSSW joint.
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    • References (8)
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