China Mechanical Engineering ›› 2023, Vol. 34 ›› Issue (24): 2996-3003.DOI: 10.3969/j.issn.1004-132X.2023.24.011

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Multi-field Coupling Simulation and Analysis for Resistance Spot Welding of Three-layer Dissimilar Unequal-thickness Steels

LI Kunhang1,2;ZHANG Siqi1;WU Wei1;HU Mingzhuo1;SUN Yaling1;XIONG Xin1;HUANG Hong3   

  1. 1.Materials Science and Engineering,Chongqing University of Technology,Chongqing,400054
    2.Chongqing Changan Automobile Co.,Ltd.,Chongqing,400023
    3.Chongqing Tiema Industrial Group Co.,Ltd.,Chongqing,400050
  • Online:2023-12-25 Published:2024-01-15

三层异种不等厚钢电阻点焊多场耦合模拟与分析

李坤航1,2;张思琦1;吴玮1;胡明卓1;孙娅铃1;熊鑫1;黄宏3   

  1. 1.重庆理工大学材料科学与工程学院,重庆,400054
    2.重庆长安汽车股份有限公司,重庆,400023
    3.重庆铁马工业集团有限公司,重庆,400050
  • 通讯作者: 吴玮(通信作者),女,1970年生,教授。研究方向为特种焊接及无损检测研究。E-mail:weiwu@cqut.edu.cn.
  • 作者简介:李坤航,男,1998年生,硕士研究生。研究方向为电阻点焊过程虚拟仿真研究。E-mail:745471312@qq.com。
  • 基金资助:
    国家自然科学基金(61974013);重庆理工大学研究生创新项目(gzlcx20222007)

Abstract: A finite element model was established for resistance spot welding of DC01 with a thickness of 1.0 mm, DP590 with thicknesses of 1.2 mm and 1.5 mm. The energy distribution and stress-strain during the spot welding processes were analyzed using the multi-field coupling of thermal field, electric field, and force field. The test results show that the numerical simulation results are in good agree with the test ones. The peak current density decreases with time, and the distribution area is different from that of the two-layer plates, with a significantly larger area of distribution in the upper and lower plates compared with the middle plate. The potential changes indicate that initial heat generation in spot welding is mainly through contact resistance, which later transforms into bulk resistance. The temperature distribution on dissimilar unequal-thickness plates is uneven, with nucleation preferentially occurs on the lower part of the middle plate and on the DP590/DP590 contact surfaces. After the formation of the nugget, the middle part is under compressive stress, while the base material zone is under tensile stress at the nugget zone. The maximum strain value exists at the DP590/DP590 location.

Key words: dissimilar steel, resistance spot welding, nucleation process, numerical simulation, multi-field coupling

摘要: 针对厚度1.0 mm的DC01、厚度1.2 mm和1.5 mm的DP590样片组,建立了电阻点焊的有限元模型,采用热场、电场、力场多场耦合分析了点焊过程能量分布和应力应变。试验结果表明:焊核尺寸的数值模拟计算结果与试验结果吻合良好,电流密度峰值随时间减小,其分布区域与两层板不同,与中板相比,在上板和下板分布的区域明显更大,电势变化说明点焊初期主要通过接触电阻产热,后期变成体电阻,温度在异种不等厚板材上分布不均匀,优先在中板下部和 DP590/DP590接触面上形核,熔核形成后中部受到压应力,母材区受到熔核拉应力,应变最大值存在于 DP590/DP590处。

关键词: 异种钢, 电阻点焊, 形核过程, 数值模拟, 多场耦合

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