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<p>With the X65/DSS2205 composite plate as the research object, laser penetration tests were conducted with and without a magnetic field to simulate the laser welding process at different welding positions. The forces acting on the molten pool in multiple positions were analyzed, the metallographic microstructure of the model welding joint was examined, and the distribution and diffusion of characteristic elements were studied using scanning electron microscopy (EDS). The content of intermetallic compounds, grain size, and orientation distribution of the weld were analyzed using electron backscatter diffraction (EBSD). The tensile properties and microhardness of the model welding joint were evaluated. The polarization curve and AC impedance of the model welding joint's clad layer in a 3.5% Cl environment were tested; the influence of multi-position changes on the corrosion resistance of model welding joint was investigated. The enhancement effect of magnetic field assistance on corrosion resistance in multi-position welding was assessed. The results indicate without a magnetic field, increasing the weld angle reduces the gravitational component along the weld, which in turn alters melt flow and weld structure. Due to the weld composition, the grain size and adjacent grain boundary angle of ferrite increase; the angle between the texture and the crack expansion surface also increases, leading to reduced joint hardness but increased toughness. In magnetic field-assisted laser welding(MF-LW), the Lorentz force inhibits the upward flow of the melt, improves multilayer component retention, and refines and evenly distributes the grains. It also reduces or eliminates pore crack formation, reduces welding stress, changes the texture orientation of the model welding joint, slows crack propagation, and improves the plasticity and toughness of the laser-model welding joint. Magnetic field-assisted laser welding of composite materials significantly improves the corrosion resistance of model welding joint and has a compensatory effect in multi-position welding, especially enhancing corrosion resistance at larger welding angles.</p>

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Laser penetration tests simulating composite plate laser welding at different positions in a magnetic field

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Yanbo Lu,
  • Ningnian Gou,
  • Xiaoxia Jiang,
  • Dianping Zhang,
  • Hengming Zhang,
  • Qi Su,
  • Yuxiao Cheng,
  • Jie Hu

摘要

With the X65/DSS2205 composite plate as the research object, laser penetration tests were conducted with and without a magnetic field to simulate the laser welding process at different welding positions. The forces acting on the molten pool in multiple positions were analyzed, the metallographic microstructure of the model welding joint was examined, and the distribution and diffusion of characteristic elements were studied using scanning electron microscopy (EDS). The content of intermetallic compounds, grain size, and orientation distribution of the weld were analyzed using electron backscatter diffraction (EBSD). The tensile properties and microhardness of the model welding joint were evaluated. The polarization curve and AC impedance of the model welding joint's clad layer in a 3.5% Cl environment were tested; the influence of multi-position changes on the corrosion resistance of model welding joint was investigated. The enhancement effect of magnetic field assistance on corrosion resistance in multi-position welding was assessed. The results indicate without a magnetic field, increasing the weld angle reduces the gravitational component along the weld, which in turn alters melt flow and weld structure. Due to the weld composition, the grain size and adjacent grain boundary angle of ferrite increase; the angle between the texture and the crack expansion surface also increases, leading to reduced joint hardness but increased toughness. In magnetic field-assisted laser welding(MF-LW), the Lorentz force inhibits the upward flow of the melt, improves multilayer component retention, and refines and evenly distributes the grains. It also reduces or eliminates pore crack formation, reduces welding stress, changes the texture orientation of the model welding joint, slows crack propagation, and improves the plasticity and toughness of the laser-model welding joint. Magnetic field-assisted laser welding of composite materials significantly improves the corrosion resistance of model welding joint and has a compensatory effect in multi-position welding, especially enhancing corrosion resistance at larger welding angles.