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<p>The butt structures of Invar alloys with a thickness of 10&#xa0;mm are successfully joined using laser-MIG hybrid welding technology. A comparative study was conducted on the microstructure and mechanical properties of the laser-MIG hybrid welded joints under two leading modes: laser leading mode and MIG leading mode. Experimental results indicated that the (Fe, Ni) phase was detected in the welds under both modes through XRD analysis. The MIG leading mode facilitated a greater penetration depth and coarser grain size, attributed to the MIG arc’s ability to absorb laser energy, thus enhancing energy absorption efficiency. In contrast to the MIG guiding mode, the laser guiding mode exhibited higher weld hardness and tensile strength, which was found to be related to grain size and texture strength.</p>

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Influence of heat source leading mode on microstructure and mechanical properties of laser-MIG hybrid welded Invar alloy joint

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Qiyu Gao,
  • Yongjing Yang,
  • Aprilia Aprilia,
  • Wei Zhou,
  • Xiaohong Zhan

摘要

The butt structures of Invar alloys with a thickness of 10 mm are successfully joined using laser-MIG hybrid welding technology. A comparative study was conducted on the microstructure and mechanical properties of the laser-MIG hybrid welded joints under two leading modes: laser leading mode and MIG leading mode. Experimental results indicated that the (Fe, Ni) phase was detected in the welds under both modes through XRD analysis. The MIG leading mode facilitated a greater penetration depth and coarser grain size, attributed to the MIG arc’s ability to absorb laser energy, thus enhancing energy absorption efficiency. In contrast to the MIG guiding mode, the laser guiding mode exhibited higher weld hardness and tensile strength, which was found to be related to grain size and texture strength.