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<p>The laser-cold metal transfer (CMT) hybrid welding was applied to connect the 12 mm thick medium manganese steel plates utilizing the advantages of high penetration of laser welding and reducing heat input of CMT technology, and the microstructures and properties of the welding joints were investigated. Although CMT technology can reduce the heat input of welding compared with traditional arc welding, the total CMT heat input of 3-layer is 50% higher than 2-layer because the wire feeding speed did not significantly affect the CMT heat input of each layer. The impact energy of 2-layer welding is larger than that of 3-layer welding for all regions because an additional third welding layer is equivalent to additional annealing, making the microstructures of welding materials more like the microstructures of heat-affected zone.</p>

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Effect of Laser-CMT Hybrid Welding Parameters on Microstructures and Properties of Dual Phase Medium Manganese Steel Welding Joint

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Y. Du,
  • H. Luo,
  • X. N. Wang,
  • W. G. Chen,
  • X. M. Chen,
  • L. Xiong,
  • X. Li,
  • L. X. Du

摘要

The laser-cold metal transfer (CMT) hybrid welding was applied to connect the 12 mm thick medium manganese steel plates utilizing the advantages of high penetration of laser welding and reducing heat input of CMT technology, and the microstructures and properties of the welding joints were investigated. Although CMT technology can reduce the heat input of welding compared with traditional arc welding, the total CMT heat input of 3-layer is 50% higher than 2-layer because the wire feeding speed did not significantly affect the CMT heat input of each layer. The impact energy of 2-layer welding is larger than that of 3-layer welding for all regions because an additional third welding layer is equivalent to additional annealing, making the microstructures of welding materials more like the microstructures of heat-affected zone.