DP590镀锌钢板电阻点焊熔核形成过程温度场数值模拟

Numerical simulation of temperature field in nugget forming process in resistance spot welding for DP590 galvanized steel sheet

基于SORPAS软件,对1.4 mm厚的DP590镀锌钢双层板电阻点焊熔核形成过程进行了数值模拟,并对比不同焊接参数下熔核尺寸的模拟值与实测值。结果表明,在电极压力4 k N、焊接电流8.4 k A、焊接时间20 cyc参数下,最高温度在两钢板接触界面处,峰值温度为1 808℃;模拟了DP590镀锌钢板电阻点焊过程中形核的不同阶段熔核附近温度场分布情况,得到了钢板和电极的峰值温度随时间变化曲线;随着焊接电流的增加,熔核尺寸呈现逐增加的趋势,模拟结果与实测结果吻合,但在小电流条件下以及大电流飞溅条件下,模拟值与实测值误差仍较大。

Based on the SORPAS software,the nugget torming process in resistance spot welding for 1.4ram thickness DP590 galvanized steel sheet douhle-layer plate is simulated,and the simulated values of nugget sizes are compared with measured values under different welding parameters. The resuhs show that when the electrode pressure is 4kN,the welding current is 8.4 kA and tile welding lime is 20 eye,the maximum temperature appears on the contact interface of the two steels,and the peak temperature is 1808~C; the temperature distributions near the nugget are simulated at different stages during nugget forming process in resistance spot welding for DP590 galvanized steel sheet,and the peak temperature-time curve of the steel plate and electrode is ohtained;As the welding eun＇ent increases,the nugget size has a increasing trend,the simulation resuhs are in good agreement with experimental resuhs,but under the conditions of low current or high current spatter,the error between simulation results and measured results is still large.