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<p>The effect of post-weld heat treatment process on the microstructure and properties of 6061 aluminum alloy joints welded using ER4047 wire by laser welding was studied by optical microscope, scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The research results indicated that with the increase in annealing temperature, the grain size of the weld seam showed a certain degree of coarsening. Moreover, some low-angle grain boundaries gradually transformed into high-angle grain boundaries, the preferred orientation weakened gradually, and there was a distinct texture evolution path of Goss+{102}&lt;201&gt; + Cube → Brass-R{236} &lt;384&gt;  + {114} &lt;234&gt;  + R-{124} &lt;211&gt;  → Goss-Brass + {110} &lt;411&gt;. Additionally, the elimination of welding residual stress, the increase of low ΣCSL grain boundary proportion and β-Mg<sub>2</sub>Si precipitations significantly improved the mechanical and corrosion resistance properties of the joints. Among which, the joint exhibited the best comprehensive performance after annealing treatment at 200&#xa0;°C for 8 h.<?oxy_comment_start comment="Please confirm the affiliation 3 has been not mentioned for any author. So we have mentioned for the first author."?><?oxy_comment_end??><?oxy_comment_start comment="Okay, no problem"?><?oxy_comment_end??><?oxy_comment_start comment=" Please suggest whether the phrase ‘Among which, the joint exhibited’ can be changed to ‘Among these, the joint exhibited’ in the sentence ‘Among which, the joint exhibited…’."?><?oxy_comment_end??><?oxy_comment_start comment="This change is very good, I agree to modify"?><?oxy_comment_end??></p>

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Effect of Post-weld Heat Treatment on Microstructure and Properties of 6061 Aluminum Alloy Laser-Welded Joints

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Haigen Jian,
  • Wu Fang,
  • Yi Liu,
  • Man Yang,
  • Jiangyao Wu

摘要

The effect of post-weld heat treatment process on the microstructure and properties of 6061 aluminum alloy joints welded using ER4047 wire by laser welding was studied by optical microscope, scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The research results indicated that with the increase in annealing temperature, the grain size of the weld seam showed a certain degree of coarsening. Moreover, some low-angle grain boundaries gradually transformed into high-angle grain boundaries, the preferred orientation weakened gradually, and there was a distinct texture evolution path of Goss+{102}<201> + Cube → Brass-R{236} <384>  + {114} <234>  + R-{124} <211>  → Goss-Brass + {110} <411>. Additionally, the elimination of welding residual stress, the increase of low ΣCSL grain boundary proportion and β-Mg2Si precipitations significantly improved the mechanical and corrosion resistance properties of the joints. Among which, the joint exhibited the best comprehensive performance after annealing treatment at 200 °C for 8 h.