变电极力对管板单面电阻点焊形核的影响  

Effect of variable electrode force on weld formation of sheet to tube joining with single-sided spot welding

作　　者：梁彩平[1] 张延松[2] 李永兵[2] 陈关龙[2] 

机构地区：[1]上海第二工业大学机电工程学院,上海201209 [2]上海交通大学汽车工程研究院,上海200240

出　　处：《焊接学报》2009年第5期5-8,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50575140)

摘　　要：根据管板单面电阻点焊结构特点,建立了轴对称有限元模型.通过结构、热电场的全耦合,分析了恒定电极力作用下,管板单面点焊的形核过程和特点,其焊接过程结构件的大变形导致形成的焊点质量不可靠.利用伺服焊枪通电过程中可实时改变电极力的特性,研究焊接过程中力的变化对焊点形状的影响规律.结果表明,单面电阻点焊焊接通电过程中改变电极力,在同等焊接工艺参数的情况下可增大焊接件间的连接宽度,减小焊接变形,提高焊点质量,为管板焊接在车身上广泛安全的应用提供理论依据.An axisymmetric finite element model was established to simulate the nucleation process of sheet-tube single-sided spot welding(SSSW).The temperature distribution could be charted in electrode and workpieces,the nucleation process and nugget formation had been simulated by the incrementally coupled thermal-electrical-mechanical analysis.The great deformation of workpieces during sheet-to-tube SSSW makes the weld quality unreliable.Servo gun as a new electrode,which has some merits such as soft touch and variable electrode during welding process,is greatly suited to SSSW.Based on the characteristics of servo gun,the effect of variable electrode force on nugget formation was analyzed.The results indicat that the decrease of electrode force during welding process can increase the width of joining,improve the quality of weld with the same welding condition.The solutions can offer the theoretical basis for the wide use of SSSW in auto production.

关 键 词：单面点焊 伺服焊枪 数值模拟 变电极力 

分 类 号：TG115.28[金属学及工艺—物理冶金]