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 dur-ing laser welding
彭进 1许红巧 1杨晓红 2王星星 1谢世华 1李俐群 3张定宇1
作者信息
- 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;浙江省农作物收获装备技术重点实验室, 金华, 321017
- 3. 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
- 折叠
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 coup-ling model of laser welding was established,and the effects of different surface tension temperature coefficients(negative val-ues)on the flow field of molten pool were compared and ana-lyzed.The results showed that with the decrease of surface ten-sion temperature coefficient,the trend of clockwise flow vor-tex behind the molten pool gradually weakened or even disap-peared,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 sur-face tension was-2.5×10-4 N/(m·K),the average length of molten pool was 3.28 mm,the average maximum flow velo-city of molten pool fluid was 2.89 m/s,and the average cross-sectional area of molten pool was 4.52 mm2.When the temper-ature 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.
关键词
激光焊接/表面张力/熔池/匙孔Key words
laser welding/surface tension/molten pool/keyhole引用本文复制引用
基金项目
国家自然科学基金(52071165)
河南省博士后科研项目(202003076)
河南省重点研发与推广专项(科技攻关计划)(232102220052)
河南省本科高等学校省级大学生创新创业训练计划(202310078011)
华北水利水电大学创新创业训练计划(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)(225101610002)
出版年
2024
NETL
NSTL
万方数据