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Impacts of torch moving on phase change and fluid flow in weld pool of SMAW

机译：焊枪运动对SMAW焊池中相变和流体流动的影响

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摘要

Shield metal arc welding (SMAW) has been widely applied in the field of engineering. Phase change performs important functions on weld pool geometry and determines weld quality. Welding torch, which is moved or not, has important effects on the phase change of weld pool and the elements distributions, which affects the weld quality. In this paper, phase change and elements distribution of welding process with torch trace of moving without swing and with e-type swing was simulated. The results show that the geometry of the weld pool under torch trace of moving without swing transfers from initial V-type to final O-type. At the ending of welding, the width of weld pool reaches 12 mm. The distance between center of each symmetrical vortexes and the center of weld pool is 3 mm. The distribution of element C is typical double peak trends and the peak value of its component is 0.0482 % appeared at the center of vortex. Using SMAW with e-type-swing torch moving, the distance of weldment diffusion is changed. The unsteady vortex has a great influence on the phase change in the weld pool. The distribution of elements is single-peaked characteristic. At the center of weld pool, the contents of C, Si, P and S are highest, which contents are 0.050 %, 0.270 %, 0.016 % and 0.010 %, respectively. But the contents of Mn, Mo, Ni and Cr at the same position are lowest, which contents are 1.121 %, 0.063 %, 0.062 % and 0.005 %. The comparison of the simulation and experimental results showed that the error range of their solid-liquid interface geometry is 3.03-4.83 %.
机译：屏蔽金属电弧焊（SMAW）已在工程领域中得到广泛应用。相变对焊池几何形状起重要作用，并确定焊缝质量。焊枪是否移动，对焊缝的相变和元素分布有重要影响，影响焊缝质量。本文模拟了具有无摆动运动和带有e型摆动的焊炬痕迹的焊接过程的相变和元素分布。结果表明，在没有摆动的情况下，焊炬在运动轨迹下的几何形状从初始V型过渡到最终O型。焊接结束时，焊接熔池的宽度达到12 mm。每个对称涡旋中心与焊池中心之间的距离为3 mm。 C元素的分布是典型的双峰趋势，其成分的峰值为0.0482％，出现在涡旋中心。通过使用带有e型摆动焊枪移动的SMAW，可以改变焊件扩散的距离。不稳定的涡流对焊池中的相变具有很大的影响。元素的分布是单峰特征。在焊缝中心，C，Si，P和S的含量最高，分别为0.050％，0.270％，0.016％和0.010％。但同一位置的Mn，Mo，Ni和Cr含量最低，分别为1.121％，0.063％，0.062％和0.005％。仿真和实验结果比较表明，固液界面几何误差范围为3.03-4.83％。

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  • 作者

    L.G. Tong; J.C. Gu; S.W. Yin; L. Wang; S.W. Bai;

  • 作者单位

    School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China,Beijing Engineering Research Center for Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China;

    School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China;

    School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China,Beijing Engineering Research Center for Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China;

    School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China,Beijing Engineering Research Center for Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China;

    Pipeline Research Institute of China National Petroleum Corporation, Hebei 065000, 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

    Phase change; Element distribution; Weld pool; SMAW;

    机译：相变元素分布;焊池手工焊;

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