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Effects of supporting plate hole and welding force on weld formation and mechanical property of friction plug joints for AA2219-T87 friction stir welds

  • Bo Du
  • Xinqi YangEmail author
  • Kaixuan Liu
  • Zhuanping Sun
  • Dongpo Wang
Research Paper
  • 57 Downloads

Abstract

Friction plug welding (FPW) experiments were performed on 8-mm-thick 2219-T87 FSW welds to investigate the weld formation, microstructure, hardness distribution, mechanical property, and fracture behaviors of FPW joint. The main findings are as follows: geometric size of supporting plate hole and welding force exert great effect on weld formation and mechanical property. Recrystallized zone (RZ) with varied width is observed on the bonding interface between the plug and base metal due to huge friction heat and deformation. Softening is found near the bonding interface due to the disappearance of cold working and transformation of constituent particles. The ultimate tensile strength (UTS) and elongation of FPW joint can reach 336.3MPa and 8%, respectively. The initial fracture of tensile specimen is prone to locate at the lower part of RZ. The tensile fracture morphology of FPW joint is characterized by dimples.

Keywords

Friction plug welding AA2219-T87 aluminum alloy FSW weld Supporting plate hole Microstructure Mechanical property 

Notes

Acknowledgments

Great thanks are given to Jianling Song and Tianjin Long March Rocket Manufacture Co., Ltd. for the help in the experimental process.

Funding information

The study is financially supported by the National Natural Science Foundation of China (51475327).

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Copyright information

© International Institute of Welding 2019

Authors and Affiliations

  • Bo Du
    • 1
  • Xinqi Yang
    • 1
    Email author
  • Kaixuan Liu
    • 1
  • Zhuanping Sun
    • 1
    • 2
  • Dongpo Wang
    • 1
  1. 1.Tianjin Key Laboratory of Advanced Joining Technology, School of Materials Science and EngineeringTianjin UniversityTianjinPeople’s Republic of China
  2. 2.Tianjin Long March Rocket Manufacture Co., Ltd.TianjinPeople’s Republic of China

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