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彭进, 许红巧, 杨晓红, 王星星, 谢世华, 李俐群, 张定宇. 表面张力对激光焊接熔池及匙孔的影响[J]. 焊接学报, 2024, 45(3): 7-14. DOI: 10.12073/j.hjxb.20230502001
引用本文: 彭进, 许红巧, 杨晓红, 王星星, 谢世华, 李俐群, 张定宇. 表面张力对激光焊接熔池及匙孔的影响[J]. 焊接学报, 2024, 45(3): 7-14. DOI: 10.12073/j.hjxb.20230502001
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PENG Jin, XU Hongqiao, YANG Xiaohong, WANG Xingxing, XIE Shihua, LI Liqun, ZHANG Dingyu. Effect of surface tension on molten pool and keyhole during laser welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(3): 7-14. DOI: 10.12073/j.hjxb.20230502001
Citation: PENG Jin, XU Hongqiao, YANG Xiaohong, WANG Xingxing, XIE Shihua, LI Liqun, ZHANG Dingyu. Effect of surface tension on molten pool and keyhole during laser welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(3): 7-14. DOI: 10.12073/j.hjxb.20230502001
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表面张力对激光焊接熔池及匙孔的影响

Effect of surface tension on molten pool and keyhole during laser welding

    摘要
  • 摘要: 基于FLUENT19.0软件，建立了激光焊接热-流耦合模型，对比分析了不同表面张力温度系数(为负值)对熔池流场的影响. 结果表明，随着表面张力温度系数的减小，熔池后方顺时针漩涡的流动趋势逐渐减弱，甚至消失，而且焊接飞溅的数量增多. 纵截面熔池长度逐渐增加，纵截面熔池流体最大流动速度逐渐增大，熔池横截面的面积逐渐减小.当表面张力温度系数为−2.5 × 10−4 N/(m·K)时，熔池长度平均值为3.28 mm、熔池流体最大流动速度的平均值为2.89 m/s、熔池横截面面积的平均值为4.52 mm2；当表面张力温度系数为−3.5 × 10−4 N/(m·K)时，熔池长度平均值为3.73 mm、熔池流体最大流动速度的平均值为3.53 m/s、熔池横截面面积的平均值为4.03 mm2；当表面张力温度系数为−4.9 × 10−4 N/(m·K)时，熔池长度平均值为4.14 mm、熔池流体最大流动速度的平均值为4.09 m/s、熔池横截面面积的平均值为3.28 mm2.

     

    Abstract: Based on fluent 19.0 software, the heat flow coupling model of laser welding was established, and the effects of different surface tension temperature coefficients (negative values) on the flow field of molten pool were compared and analyzed.The results showed that with the decrease of surface tension temperature coefficient, the trend of clockwise flow vortex behind the molten pool gradually weakened or even disappeared, and the amount of welding spatter increased, the length of longitudinal section molten pool gradually increased, the maximum flow velocity of longitudinal section molten pool gradually increased, and the cross-sectional area of molten pool gradually decreased.When the temperature coefficient of surface tension was −2.5 × 10−4 N/(m·K), the average length of molten pool was 3.28 mm, the average maximum flow velocity of molten pool fluid was 2.89 m/s, and the average cross-sectional area of molten pool was 4.52 mm2.When the temperature coefficient of surface tension was −3.5×10−4 N/(m·K), the average length of molten pool was 3.73 mm, the average maximum flow velocity of molten pool fluid was 3.53 m/s, and the average cross-sectional area of molten pool was 4.03 mm2.When the temperature coefficient of surface tension was −4.9×10−4 N/(m·K), the average length of molten pool was 4.14 mm, the average maximum flow velocity of molten pool fluid was 4.09 m/s, and the average cross-sectional area of molten pool was 3.28 mm2.

     

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