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DAI Qilei, MENG Lichun, LIANG Zhifang, WU Jianjun, SHI Qingyu. Comparison of fatigue crack propagation behavior of friction stir welded and metal inert-gas welded A6N01 joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(9): 9-12,38.
Citation: DAI Qilei, MENG Lichun, LIANG Zhifang, WU Jianjun, SHI Qingyu. Comparison of fatigue crack propagation behavior of friction stir welded and metal inert-gas welded A6N01 joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(9): 9-12,38.
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Comparison of fatigue crack propagation behavior of friction stir welded and metal inert-gas welded A6N01 joints

  • 1.

    Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

  • 2.

    CSR Sifang Locomotive and Rolling Stock. Co. Lt., Qingdao 266000, China

  • 3.

    Fundamental Industrial Training Center, Tsinghua University, Beijing 100084, China

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  • Received Date: January 14, 2014
    Graphical Abstract
    • Abstract
  • Fatigue crack propagation (FCP) behavior at different locations of friction stir welded (FSW) and metal inert-gas welded (MIG) A6N01 joints were studied. The fatigue fractures and microstructures of the joints were analyzed. For FSW and MIG joints, the fatigue crack propagation rate (FCPR) in nugget (weld) zone was the highest, while the FCPR in heat-affected zone (HAZ) was lower than that in the nugget (weld) zone. The base metal had the highest fatigue crack propagation resistance. The FCPR had no significant difference when crack propagated in the same regions of FSW and MIG joints. However, the fatigue crack growth threshold (ΔKth) of crack propagating in the nugget zone of FSW joint was higher than that of MIG joint, in other words, the resistance to fatigue crack propagation in the nugget zone of FSW joint was superior to that of MIG joint. The fracture surface of fatigue crack propagating in the nugget (weld) zone of FSW and MIG joints revealed brittle fracture, while that in heat-affected zone was mainly plastic fatigue striation.
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    • References (12)
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