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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of energy density attenuation on the stability of keyhole and molten pool during deep penetration laser welding process: A combined numerical and experimental study
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Effects of energy density attenuation on the stability of keyhole and molten pool during deep penetration laser welding process: A combined numerical and experimental study

机译：能量密度衰减对深渗透激光焊接过程中锁孔和熔池稳定性的影响：综合数值和实验研究

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摘要

The energy density attenuation of focused laser beam could induce inconsistent thermodynamic behaviors from near field to far field, which leads to the deterioration of the welding stability. However, the influence of energy density attenuation on welding process remains unclear. In this work, a set of innovative characterizing methods are presented to quantitatively evaluate the features of the front keyhole wall and molten pool dynamics. The energy density attenuation and correlative phenomena are numerically studied using a multiphase model. This model incorporates an improved ray-tracing method which can describe the actual beam profile more accurately. Based on experimental and numerical results, a unique melting behavior, i.e., the alternate melting between keyhole wall and keyhole bottom due to the energy density attenuation, is discovered. This melting behavior is primarily caused by movement of protrusions along the front keyhole wall, which can change the energy absorption efficiency significantly. Besides, it is found that the fluctuation amplitude of molten pool is closely related to this melting behavior. By sustaining protrusion movement process, the melting behavior can be regulated and hence improve the molten pool stability. Finally, an optimization method by adjusting the beam defocus and inclination is proposed and testified to improve the welding stability.
机译：聚焦激光束的能量密度衰减可以引起来自近场的不一致热力学行为到远场，这导致焊接稳定性的劣化。然而，能量密度衰减对焊接过程的影响仍不清楚。在这项工作中，提出了一套创新的特征方法来定量评估前钥匙孔壁和熔融池动力学的特征。使用多相模型进行数值研究能量密度衰减和相关现象。该模型包含一种改进的射线跟踪方法，可以更准确地描述实际的光束轮廓。基于实验和数值结果，发现了独特的熔化行为，即由于能量密度衰减而导致的锁孔壁和钥匙孔底部之间的交替熔化。这种熔化行为主要由沿着前锁孔壁的突起移动引起的，这可以显着改变能量吸收效率。此外，发现熔池的波动幅度与这种熔化行为密切相关。通过维持突出运动过程，可以调节熔化行为，因此提高熔池稳定性。最后，提出了一种通过调节光束散焦和倾斜度的优化方法，并证实改善焊接稳定性。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121410.1-121410.13|共13页
  • 作者

    Yilin Wang; Ping Jiang; lintian Zhao; Shaoning Geng; Boan xu;

  • 作者单位

    The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

    The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

    The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

    The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

    The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Deep penetration laser welding; Energy attenuation; Molten pool fluctuation; Welding stability;

    机译：深渗透激光焊接;能量衰减;熔池波动;焊接稳定性;

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