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

作　　者：彭进[1] 许红巧 杨晓红[2,3] 王星星 谢世华[1] 李俐群 张定宇[1] PENG Jin;XU Hongqiao;YANG Xiaohong;WANG Xingxing;XIE Shihua;LI Liqun;ZHANG Dingyu(North China University of Water Resources and Electric Power,Material College,Henan International Joint Laboratory of High-efficiency Special Green Welding,Zhengzhou,Henan,450045,China;Jinhua Polytechnic,Jinhua,Zhejiang,321017,China;Key Laboratory of Crop Harvesting Equipment Technology of Zhejiang Province,Jinhua,Zhejiang,321017,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,Heilongjiang,150001,China)

机构地区：[1]华北水利水电大学,河南省高效特种绿色焊接国际联合实验室,郑州450045 [2]金华职业技术学院,金华321017 [3]浙江省农作物收获装备技术重点实验室,金华321017 [4]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2024年第3期7-14,I0003,共9页Transactions of The China Welding Institution

基　　金：国家自然科学基金项目(52071165);河南省博士后科研项目(202003076);河南省重点研发与推广专项(科技攻关)项目(232102220052);河南省本科高校省级大学生创新创业训练计划项目(202310078011);华北水利水电大学创新创业训练项目(2023XB004);河南省高等学校重点科研项目(24A460017);河南省科技研发联合基金(产业类):氢用高速无油润滑轴承及电机关键技术研发及产业化(225101610002)。

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 mm^(2);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 mm^(2);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 mm^(2).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 crosssectional area of molten pool was 4.52 mm^(2).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 mm^(2).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 mm^(2).

关 键 词：激光焊接 表面张力 熔池 匙孔 

分 类 号：TG456.7[金属学及工艺—焊接]