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<p>The impact of welding speed on the microstructure and mechanical properties of 6061 aluminum alloy with 2&#xa0;mm thickness by laser swing welding was discussed. The results show that the weld surface is good and no obvious defects are observed. The weld zone is equiaxed crystal, while the heat-affected zone is columnar crystal. The phase composition of the weld zone is α-Al and Mg<sub>2</sub>Si. When the welding speed is 40&#xa0;mm/s, the grain distribution in the weld zone is uniform, and the joint quality is good. The microhardness of the weld achieves a peak of 79.2&#xa0;HV. The tensile strength at this welding speed reaches 250&#xa0;Mpa and the elongation is 5.5%. The fracture mode of all specimens is a ductile fracture.</p>

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Study on Microstructure Evolution and Properties of Laser-Welded Joints of 6061 Aluminum Alloy Body

  • 期刊论文

  • 发表日期：

    2025年4月26日

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  • Shuang Liu,
  • Zhanqi Liu,
  • Xiang Li,
  • Pengfei Li,
  • Guili Yin

摘要

The impact of welding speed on the microstructure and mechanical properties of 6061 aluminum alloy with 2 mm thickness by laser swing welding was discussed. The results show that the weld surface is good and no obvious defects are observed. The weld zone is equiaxed crystal, while the heat-affected zone is columnar crystal. The phase composition of the weld zone is α-Al and Mg2Si. When the welding speed is 40 mm/s, the grain distribution in the weld zone is uniform, and the joint quality is good. The microhardness of the weld achieves a peak of 79.2 HV. The tensile strength at this welding speed reaches 250 Mpa and the elongation is 5.5%. The fracture mode of all specimens is a ductile fracture.