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<p>In this study, the effect of laser-MAG hybrid welding on microstructures and impact toughness were investigated in medium-Mn steel. Four different laser welding parameters were chosen, which were double-side laser welding (DSLW), double-side hybrid welding (DSHW), single-layer hybrid welding (SLHW), and double-layer hybrid welding (DLHW). The results show that the high impact energy of heat-affected zone (HAZ) is due to the austenite retained through rapid thermal cycling. The simulation result shows that both the laser zone and the arc zone can basically achieve a cooling rate of over 50&#xa0;°C/s, so the microstructure of welding joints is mainly composed of martensite. Adding elements to increase the impact energy in welding joints is a reasonable direction to increase the impact energy of fusion zone (FZ).</p>

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The Microstructures and Impact Toughness of Medium-Mn Steel Plate Laser-MAG Hybrid Welding Joint

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Y. Du,
  • X. N. Wang,
  • T. Liu,
  • Y. W. Zhou,
  • X. Li,
  • L. X. Du

摘要

In this study, the effect of laser-MAG hybrid welding on microstructures and impact toughness were investigated in medium-Mn steel. Four different laser welding parameters were chosen, which were double-side laser welding (DSLW), double-side hybrid welding (DSHW), single-layer hybrid welding (SLHW), and double-layer hybrid welding (DLHW). The results show that the high impact energy of heat-affected zone (HAZ) is due to the austenite retained through rapid thermal cycling. The simulation result shows that both the laser zone and the arc zone can basically achieve a cooling rate of over 50 °C/s, so the microstructure of welding joints is mainly composed of martensite. Adding elements to increase the impact energy in welding joints is a reasonable direction to increase the impact energy of fusion zone (FZ).