乘用车侧围点焊热变形分析

Analysis of Thermal Deformation of Spot Welding for Side Wall of Passenger Car

基于电阻点焊热传导理论及热弹塑性理论,建立乘用车侧围点焊热应力场模型.采用有限元分析法求解该热应力场模型,在预先求解点焊瞬态温度场后,将其作为节点温度载荷施加于侧围几何模型上,最终获取其热应力、热变形的分布规律,为乘用车侧围乃至车身在焊接后更好地满足精度要求提供了相应的理论依据和技术基础.

Based on the theory of resistive spot welding and thermo-elastic-plasticity,the thermal stress field model of side-wall welding of passenger car was established.The finite element method was used to solve the transient temperature field,loaded on the geometrical model as a node temperature,and the distribution of thermal stress and thermal deformation were obtained.The side wall of passenger car and body meets the accuracy requirements better after welding,which provides an appropriate theoretical and technical basis for the automotive engnineering.