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| 铝合金电阻点焊过程的有限元模拟 |
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常保华1, 都东1, CHEN Qiang1, ZhouY2
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1.清华大学 机械工程系, 北京 100084;2.Department of Mechanical Engineering University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
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| 摘要: |
| 建立了铝合金电阻点焊过程的有限元分析模型,采用基于显微接触理论的接触电阻模型模拟点焊过程中试件与试件界面上的接触电阻。计算获得了焊接过程中电极/试件和试件/试件接触界面上接触半径的变化,以及试件间界面上压应力、电流密度和温度的分布。试验考察了熔核的形成和长大过程。比较表明,计算与试验测量结果符合很好,证实了所采用的接触电阻模型在铝合金电阻点焊模拟中的正确性和适用性。 |
| 关键词: 电阻点焊 铝合金 有限元方法 接触电阻 |
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| 基金项目:国家教育部留学回国人员科研启动金资助项目;中国博士后科学基金的资助项目 |
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| Finite element simulation of resistance spot welding process of aluminum alloys |
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CHANG Bao-hua1, DU Dong1, CHEN Qiang1, ZHOU Y2
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1.Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;2.Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, N21 3G1, Canada
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| Abstract: |
| A finite element analysis model was established for resistance spot welding of aluminum alloys, and a contact resistance model based on micro-contact theory was employed to describe the contact resistance at the faying surface. The variation of contact radii at electrode/workpiece and workpiece/workpiece interfaces, in addition to the distribution of stress, current density and temperature at the faying surface during spot welding process were all obtained. Experiments were conducted to examine the process of nugget initiation and growth. Comparisons show that the calculated and experimentally measured results agreed with each other very well, which validate the correctness and suitablilty of the contact resistance model in modeling the resistance spot welding of aluminum alloys. |
| Key words: resistance spot welding aluminum alloys finite element method contact resistance |
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