管板单边电阻点焊过程预压接触分析  

Contact status during squeeze stage of sheet-tube single-sided spot welding using servo gun

作　　者：梁彩平[1] 李永兵[1] 林忠钦[1] 陈关龙[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030

出　　处：《焊接学报》2006年第7期29-33,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50575140)

摘　　要：通过建立轴对称有限元模型,对管板单边电阻点焊预压过程中电极与板以及板与管间接触行为进行了研究,系统分析了预压阶段接触区域范围及接触压力分布的影响因素。研究发现,管板焊接过程预压阶段的接触压力分布与传统点焊过程预压阶段接触压力分布有很大的不同。在电极和板以及板和管之间均形成环状接触区,可能导致焊后形成环状熔核;预压过程中,电极和板间接触区不受压力变化影响,板和管间接触区则受压力影响明显;接触区域大小和电极端面直径、管板厚度等因素均有关系。试验表明,所建模型的模拟结果与实际是相吻合的,为今后管板电阻点焊工艺参数优化及车身轻量化中管板厚度比优化提供有效依据。An axisymmetric finite element model was developed to simulate the contact status between electrode and sheet and between sheet and tube during the squeeze stage of sheet-tube single-sided spot welding.Some influencing factors on the contact region and pressure distribution were discussed.Analyses showed that the squeeze stage of sheet-tube single-sided spot welding has great difference from that of the traditional spot welding.By the results,there exist ring contact regions between the electrode and sheet and between sheet and tube which are different greatly and will get a ring nugget after welding.The contact region between the electrode and sheet is determined by electrode end size rather than pressure,but that between the sheet and tube is determined by pressure as well as electrode size.In addition,comparison of the analytic results to test data using servo gun are presented and discussed.The simulated results are in good accordauce with the experiments.The stuties offer the proof for the parameter optimization in body light weight and nugget quality control.

关 键 词：电阻点焊 单边焊 液压管 预压接触 数值模拟 

分 类 号：TG444.7[金属学及工艺—焊接]