| 何林基， 张天雷， 徐刚， 顾广石， 马春伟.表面张力对激光深熔焊熔池小孔的影响[J].轻工机械,2021,39(4):51-55 |
| 表面张力对激光深熔焊熔池小孔的影响 |
| Effect of Surface Tension on Keyhole in Molten Pool of Laser Deep Penetration Welding |
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| DOI：10.3969/j.issn.1005 2895.2021.04.010 |
| 中文关键词: 激光深熔焊 表面张力 有限元仿真 FLUENT |
| 英文关键词:laser deep fusion welding surface tension FEA(Finite Element Analysis) FLUENT |
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| 中文摘要: |
| 为了探究表面张力对于激光焊接熔池的影响，课题组使用移动旋转高斯体热源来简化焊接的热过程，建立数学模型，获得了奥氏体不锈钢深熔焊接过程中动态熔池的温度场以及流场分布；同时以奥氏体不锈钢为基板进行激光焊接试验，试验得到的焊缝横截面尺寸同模型计算结果得到的熔池尺寸相吻合，验证了模型的可靠性；以此为基础对2种不同表面张力系数下激光焊接熔池过程进行仿真。研究结果表明：激光深熔的过程中，表面张力系数较小时，焊接小孔深度较深，有利于热量向钢板厚度方向传递，增大了熔池深度，但是降低了焊接小孔的稳定性。因此，可以通过改变表面张力系数来调整熔池的流动行为，提高焊接质量。 |
| 英文摘要: |
| In order to study the influence of surface tension on laser welding pool, a moving and rotating Gauss body heat source was used to simplify the welding heat process, and a mathematical model was established to obtain the temperature field and flow field distribution of the dynamic pool during the deep fusion welding of austenitic stainless steel. At the same time, austenite stainless steel was used as the base metal for laser welding experiments, and the weld cross sectional fusion line of the test was consistent with the model calculation results, which verifies the reliability of the model. Based on this, the simulation was carried out for the molten pool process of laser welding under two different surface tension coefficients.The results show that when the surface tension coefficient is small, the welding hole depth is deep, which is conducive to the heat transfer to the thickness direction of the steel plate,and increases the welding pool depth, but reduces the welding hole stability.Therefore, the flow behavior of molten pool can be adjusted by changing the surface tension coefficient to improve the welding quality. |
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