汽车用DP800双相钢电阻点焊温度场数值模拟研究  

Numerical Simulation on Temperature Filed During Resistance Spot Welding of DP800 Duplex Steel

作　　者：张梅红[1] 魏冬至 

机构地区：[1]河南工业贸易职业学院机电工程系,河南郑州450000 [2]郑州市技师学院,河南郑州450000

出　　处：《热加工工艺》2016年第5期243-246,共4页Hot Working Technology

基　　金：河南省科学技术厅软科学研究计划项目(132400410718)

摘　　要：采用SORPAS专用电阻焊有限元软件,对1.4 mm的DP800双相钢电阻点焊温度场进行了模拟,并将熔核形貌模拟结果与实验结果进行对比。结果表明,在参考工艺下,通电加热阶段电极和焊件峰值均升高,工件温度升高速度明显高于电极,通电过程结束时电极峰值温度达最高值566℃,焊件峰值温度达2120℃;随着焊接电流的增加,热循环曲线逐渐上移,加热速度和最高温度逐渐升高,高温停留时间延长;随着焊接时间的增加,加热速度没有明显变化,最高温度逐渐升高,高温停留时间延长;在没有飞溅的条件下模拟熔核形貌与实验结果基本吻合,但在大电流条件下由于飞溅的产生,造成模拟熔核尺寸大于实际结果。With the use of SORPAS software, the temperature field of 1.4mm thickness DP800 steel spot welding process was simulated, and the simulated nugget morphologies were compared with experimental results. The results show that, under the referred weld procedures, the peak temperature of the electrodes and work-piece increases in the heating stage, the rising rate of work-piece temperature was obviously higher than that of the electrode, and the electrode reaches the highest peak temperature of 566℃ and the 2120℃ for work-piece at the end of the heating stage. With the increase of welding current, the thermal cycle curve goes upward, the heating rate and peak temperature increases gradually, and the holding time at high temperature prolongs; with the increase of welding time, heating rate does not change significantly, the peak temperature increases gradually, and the holding time at high temperature prolongs; simulating nugget appearance coincides with the measured results under no spatter condition, but the simulated nugget size is larger than the measured results due to the spatter generating in higher current condition.

关 键 词：DP800双相钢 电阻点焊 数值模拟 

分 类 号：TG453.9[金属学及工艺—焊接]