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首页> 外文期刊>Optics & Laser Technology >Simulation and experimental studies of keyhole induced porosity in laser-MIG hybrid fillet welding of aluminum alloy in the horizontal position
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Simulation and experimental studies of keyhole induced porosity in laser-MIG hybrid fillet welding of aluminum alloy in the horizontal position

机译：水平位置铝合金激光型混合圆角焊接胶孔诱导孔隙率的仿真及实验研究

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摘要

The keyhole induced porosity in laser-MIG hybrid fillet welding of aluminum alloy in the horizontal position was investigated with simulation and experimental methods. A three dimensional model is developed, which takes into account geometric feature of horizontal filled joint and the coupling of keyhole, droplet and molten pool. Meanwhile, the major forces are also incorporated in the model. The inclination of heat source is dealt with through rotation of coordinate system. This model is able to calculate the keyhole dynamic behavior and the formation process of gas bubble as well as keyhole induced porosity directly. Also, it can describe the merging and disappearing of bubbles. The weld porosity was examined by the X-ray non-destructive testing. Large weld pool size provides more time for bubble to escape from the molten pool, which is the major factor responsible for the reduction in hybrid welding. Besides, the forward flow caused by the clockwise vortex is weakened, which also plays a positive role in improving the stability of back keyhole wall. The keyhole collapses at the middle part easily in horizontal fillet welding, raising the possibility of forming large pore. Bubble is easy to be captured by the upper weld pool boundary when floating up. With enhancing the welding current, the stability of keyhole is enhanced to some extent and the keyhole induced porosity is reduced.
机译：采用仿真和实验方法研究了水平位置中铝合金激光 - MIG混合圆角焊接中的锁孔诱导孔隙率。开发了三维模型，这考虑了水平填充接头的几何特征和锁孔，液滴和熔池的联轴器。同时，主要的力量也包含在模型中。通过坐标系的旋转处理热源的倾斜度。该模型能够直接计算气泡的锁孔动力学行为和锁孔诱导孔隙率。此外，它可以描述泡沫的合并和消失。通过X射线非破坏性测试检查焊接孔隙率。大型焊接池大小为泡沫提供更多时间来逃离熔池，这是负责减少混合焊接的主要因素。此外，由顺时针涡旋引起的前向流动削弱，这也在提高后孔墙的稳定性方面起着积极作用。钥匙孔在水平圆角焊接中容易塌陷，提高形成大孔的可能性。浮动时，上焊池边界易于捕获气泡。随着焊接电流的增强，匙孔的稳定性增强至一定程度，并且减少了钥匙孔诱导的孔隙率。

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  • 来源
    《Optics & Laser Technology》 |2019年第2019期|共12页
  • 作者

    Xu Guoxiang; Li Lin; Wang Houxiao; Li Pengfei; Guo Qinghu; Hu Qingxian; Du Baoshuai;

  • 作者单位

    Jiangsu Univ Sci &

    Technol Jiangsu Prov Key Lab Adv Welding Technol Zhenjiang 212003 Jiangsu Peoples R China;

    Jiangsu Univ Sci &

    Technol Jiangsu Prov Key Lab Adv Welding Technol Zhenjiang 212003 Jiangsu Peoples R China;

    Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Sci &

    Technol Jiangsu Prov Key Lab Adv Welding Technol Zhenjiang 212003 Jiangsu Peoples R China;

    Jiangsu Univ Sci &

    Technol Jiangsu Prov Key Lab Adv Welding Technol Zhenjiang 212003 Jiangsu Peoples R China;

    Jiangsu Univ Sci &

    Technol Jiangsu Prov Key Lab Adv Welding Technol Zhenjiang 212003 Jiangsu Peoples R China;

    State Grid Shandong Elect Power Res Inst Jinan 250002 Shandong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

    Hybrid welding; Horizontal fillet joint; Porosity; Aluminum alloy; Numerical simulation;

    机译：混合焊接;水平圆角关节;孔隙度;铝合金;数值模拟;

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