三层不锈钢板电阻点焊温度场数值模拟

NUMERICAL SIMULATION FOR RESISTANCE SPOT WELDING NUGGET PROCESS OF THREE LAYERS STAINLESS STEEL SHEETS

根据三层不锈钢板电阻点焊熔核形成过程,建立了模拟三层板点焊温度场的轴对称有限元模型。在分析了三层板点焊的热电过程基础上,计算结果表明三层板点焊熔核初期是先形成包含中间板和上下工件/工件接触面的较小的熔核,随时间延长,熔核再沿轴向和径向逐渐长大的过程。通过试验验证表明,数值模拟结果与实际吻合良好。该模型为进一步的电阻点焊多层板的温度场和应力场分析提供了基础。

An axisymmetric finite element model is developed to simulate the temperature field of resistant spot welding according to the process of nugget formation of three layers stainless steel sheets. A simulation method of the interaction of electrical and thermal factors is presented. Computed results show in the early stages of nugget formation, a small nugget which comprised up and down faying surfaces and middle sheet is firstly developed. With time prolonging, the nugget then develops along the axial and radial direction. Experimental verification shows that the model prediction agrees well with the practical. This model provides a useful basis for the analysis of temperature field and stress filed of resistance spot welding for multi-layers sheets.