基于焊接模拟的B柱激光焊接变形预测

Prediction of Laser Welding Deformation of B-pillar Based on Welding Simulation

对B柱加强板与B柱内板进行了激光焊接试验,根据试验焊缝与模拟熔池的形貌对比得到热源输入参数,并参考实际焊接的过程建立了激光焊有限元模型,基于热塑性有限元方法模拟了热成型B柱加强板的激光焊接变形,并将模拟的板件变形与试验件的三维光学扫描结果进行了对比。结果表明,热成型B柱加强板在激光焊接后铰链孔处产生最大1.25 mm的y向变形,与试验件的三维光学扫描结果一致性较好。同时把上述模拟方法成功地应用到某车型白车身侧围门框的激光焊接,预测了侧围外板的焊接变形。

The laser welding experiments were carried out between the B column reinforced plate and the B column inner plate. The heat source input parameters were obtained by comparing the morphology of the experimental weld with the simulated weld pool, and the finite element model of laser welding was established according to the actual welding process.Based on the thermoplastic finite element method, the laser welding deformation of hot formed B column reinforced plate was simulated, and the simulated plate deformation is compared with the 3 D optical scanning results of the test piece. The results show that the maximum y direction deformation of the hot formed B column reinforced plate at the hinge hole after laser welding is 1.25 mm, which is in good agreement with the 3 D optical scanning results of the specimen. At the same time, the simulation method mentioned above has been successfully applied to the laser welding for the side frame of a car white body.The welding deformation of the side panel was predicted.