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<p>The fatigue strength of A6N01S-T5 aluminum alloy welded joints was studied by staircase test and scanning electron microscope fracture observation test. The results show that the conditional fatigue limit of double-pulse MIG welded joint is 97&#xa0;MPa, which is higher than 92&#xa0;MPa of single-pulse MIG welded joint. Fatigue fracture of double-pulse welded joints may occur in weld, fusion line, HAZ, or base metal zone. The fatigue fracture of single-pulse MIG welded joints mostly occurs in the weld zone. The pores were not found in the double-pulse MIG welded joints, which indicated that the double-pulse welding can avoid the fracture caused by pores.</p>

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Effect of Current Pulse Mode on Fatigue Strength of A6N01S-T5 Aluminum Alloy Welded Joints

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Ye-feng Bao,
  • Chen Chen,
  • Xiang-jun Zhang,
  • Xiang Xu,
  • Yong Jiang,
  • Guo-xu Wang,
  • Lei Chen,
  • Qi-ning Song,
  • Nan Xu,
  • Yong-feng Jiang

摘要

The fatigue strength of A6N01S-T5 aluminum alloy welded joints was studied by staircase test and scanning electron microscope fracture observation test. The results show that the conditional fatigue limit of double-pulse MIG welded joint is 97 MPa, which is higher than 92 MPa of single-pulse MIG welded joint. Fatigue fracture of double-pulse welded joints may occur in weld, fusion line, HAZ, or base metal zone. The fatigue fracture of single-pulse MIG welded joints mostly occurs in the weld zone. The pores were not found in the double-pulse MIG welded joints, which indicated that the double-pulse welding can avoid the fracture caused by pores.