三层钢板胶焊熔核形成过程的有限元分析

Finite Element Analysis of Weld Nugget Formation in Weld-Bonding of Three Stacks of Steel Sheets

基于ANSYS有限元分析软件,将胶层引起的钢板间接触电阻进行参数化处理,建立了考虑胶层作用的三层钢板胶焊熔核形成过程的多物理场耦合模型,从结构场、电场、温度场分布等方面分析三层钢板胶焊熔核的形成特点,并通过实验验证了所建模型的可靠性.结果表明:对于厚度为0.8 mm DC04低碳钢、厚度1.4 mm DP600双相钢和厚度1.8 mm DP780双相钢的三层钢板胶焊,胶层使得相同电流下三层钢板胶焊熔核的形成时刻比无胶层的点焊熔核的形成时刻提前了约40 ms;在DP600双相钢与DP780双相钢接触面的熔核形成时刻比在DC04低碳钢与DP600双相钢接触面的熔核形成时刻提前约80 ms.

Based on the ANSYS software, a multi-physics finite element model was established to research the weld nugget formation during the weld-bonding process of three stacks of steel sheets. The contact resistance between the steel sheets with the adhesive was parameterized in this model to illustrate the effect of the adhesive on the weld-bonding process. The calculation results in the structure, electric and thermal field during the weld nugget formation were investigated and validated by the experiment. The research results show that the weld nugget formation in the weld-bonding joint with 0. 8 mm DC04 1.4 mm DP600 and 1. 8 mm DP780 is about 40 ms earlier than that in the resistance spot welding joint under the same welding condition. The weld nugget formation between DP600 and DP780 is 80 ms earlier than that between DC04 and DP600 during the weld-bonding process.