首页|表面张力对激光焊接熔池及匙孔的影响

表面张力对激光焊接熔池及匙孔的影响

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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.
Effect of surface tension on molten pool and keyhole dur-ing laser welding
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.

laser weldingsurface tensionmolten poolkeyhole

彭进、许红巧、杨晓红、王星星、谢世华、李俐群、张定宇

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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

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

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

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激光焊接 表面张力 熔池 匙孔

国家自然科学基金河南省博士后科研项目河南省重点研发与推广专项(科技攻关计划)河南省本科高等学校省级大学生创新创业训练计划华北水利水电大学创新创业训练计划河南省高等学校重点科研项目河南省科技研发联合基金(产业类)

520711652020030762321022200522023100780112023XB00424A460017225101610002

2024

10.12073/j.hjxb.20230502001

焊接学报
中国机械工程学会　中国机械工程学会焊接学会　机械科学研究院哈尔滨焊接研究所

焊接学报

CSTPCD北大核心
影响因子：0.815
ISSN：0253-360X
年,卷(期)：2024.45(3)
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