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<p>To investigate the effect of pulse mode on the microstructure and mechanical properties of A6N01S-T5 aluminum alloy welded joints, a comparative study was conducted between SP-MIG (single-pulse melt inert-gas welding) and DP-MIG (double-pulse melt inert-gas welding) welding processes. The research employed nondestructive testing (NDT), optical microscopy, mechanical property evaluations, and ultrasonic residual stress measurements to systematically analyze microstructural characteristics, static mechanical performance, and residual stress distributions. The results demonstrate that DP-MIG welded joints exhibit superior hardness and higher average tensile strength compared to SP-MIG joints. Additionally, DP-MIG welds present more aesthetically pleasing appearance with well-defined fish-scale patterns and are free from porosity defects. However, due to the higher heat input in DP-MIG welding, the DP-MIG welded joints exhibit greater peak residual stresses compared to SP-MIG welds, along with marginally inferior toughness.</p>

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Effect of pulse mode on microstructure and properties of A6N01S-T5 aluminum alloy welded joints

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Yefeng Bao,
  • Xiang Xu,
  • Xiangjun Zhang,
  • Chen Chen,
  • Yong Jiang,
  • Guoxu Wang,
  • Lei Chen,
  • Qining Song,
  • Nan Xu,
  • Yongfeng Jiang

摘要

To investigate the effect of pulse mode on the microstructure and mechanical properties of A6N01S-T5 aluminum alloy welded joints, a comparative study was conducted between SP-MIG (single-pulse melt inert-gas welding) and DP-MIG (double-pulse melt inert-gas welding) welding processes. The research employed nondestructive testing (NDT), optical microscopy, mechanical property evaluations, and ultrasonic residual stress measurements to systematically analyze microstructural characteristics, static mechanical performance, and residual stress distributions. The results demonstrate that DP-MIG welded joints exhibit superior hardness and higher average tensile strength compared to SP-MIG joints. Additionally, DP-MIG welds present more aesthetically pleasing appearance with well-defined fish-scale patterns and are free from porosity defects. However, due to the higher heat input in DP-MIG welding, the DP-MIG welded joints exhibit greater peak residual stresses compared to SP-MIG welds, along with marginally inferior toughness.