DP590双相钢电阻点焊熔核形成过程的数值模拟  

Numerical Simulation of Nugget Formation in Resistance Spot Welding of DP590 Dual-phase Steel

作　　者：王敏[1] 张海涛[1] 潘华[2] 雷鸣[2] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240 [2]宝山钢铁股份有限公司技术中心,上海201900

出　　处：《上海交通大学学报》2009年第1期56-60,共5页Journal of Shanghai Jiaotong University

基　　金：上海市科教兴市子项目

摘　　要：基于SORPAS软件,针对DP590双相钢建立了描述点焊熔核形成过程的轴对称有限元模型,通过数值模拟定量揭示了双相钢点焊熔核的生长以及焊接热输入对熔核形成的影响,进而预测了典型点焊规范参数下的熔核尺寸,并通过实验验证了所建模型和计算结果的可靠性.结果表明:在一定的电极压力和焊接电流条件下,随着加热时间增加,点焊熔核经历了塑性粘连-产生熔核-熔核迅速长大-熔核缓慢长大的过程;随着点焊热输入的增加,熔核中心的最高加热温度升高,熔化温度以及奥氏体化温度以上的停留时间均延长,有利于奥氏体的均匀化以及熔核长大;由于数值模拟时对点焊飞溅考虑不足,使得在焊接电流较大时,计算所得熔核尺寸明显大于实测值,而在中、小焊接电流时熔核尺寸的模拟结果与实验结果较吻合.研究结果对汽车轻量化生产中双相钢的焊接具有指导意义.Based on software SORPAS, an axial symmetric finite element model for the spot welding process of DP590 dual-phase steel was established. By numerical simulation, the nugget formation process and the effect on nugget formation of welding energy during resistance spot welding were discovered quantitatively. Thereby, nugget size was forecasted with typical welding parameters. The experimental results show that the formation and growth of a weld nugget goes through plastic join-melting-growing up quicklygrowing up slowly as the heating time increases under given electrode force and welding current. As the increase of welding input energy, the peak temperature in the nugget center increases, the heating time up melting point and austenitic temperature increases. It makes for the uniformity of austenitic and growth of nugget. Because it is ill-considered weld expulsion in the simulation, the simulative result for nugget size is obviously bigger than the experimental one under big welding current, but they are well fitted under suitable welding current. The results may be useful and guiding for RSW of DP590 dual-phase steel during au-to light-weighting production.

关 键 词：DP590双相钢 SORPAS软件 电阻点焊 熔核形成 数值模拟 

分 类 号：TG453.9[金属学及工艺—焊接]