铝合金电阻点焊中点蚀环形成的数值分析  

Numerical analysis of electrode pitting in resistance spot welding process of aluminum alloys

作　　者：米晨雷[1] 吴志生[1] 刘翠荣[1] 申志刚[1] 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《焊接技术》2011年第3期15-18,72,共4页Welding Technology

基　　金：山西省自然科学基金(2009011028-2);省留学基金(20081072);太原市人才明星专项(09121013)

摘　　要：为减少电极点蚀,提高电极寿命,建立了铝合金电阻点焊过程数值模拟的有限元分析模型,利用大型软件ANSYS Workbench考察焊接过程中电极表面温度、电流密度、电极压力的分布情况。结果表明:在电极与工件接触区的边缘处存在电极压力和电流密度集中区,并且此处存在明显的高温现象。由此推断,电极表面上点蚀环的形成主要是由于电极与试件接触区的边缘处存在应力集中和电流的"边缘效应"引起的。Experiments indicated that the initial pitting was in a ring form with a radius pretty close to the radius of the contact region.To prevent pitting from occurrence and improve electrode life,a finite element analysis model was constructed to simulate the resistance spot welding process of aluminum alloys.The temperature of electrode tip surface,the current density and the distribution of stress were simulated by means of ANSYS workbench.The results showed that the electrode stress,the current density and the highest temperature all concentrated at the edge of contact region.It was deduced that the ring form pitting could be attributed to the stress concentration and the current 'edge effect' at the edge of contact region.

关 键 词：铝合金 电阻点焊 电极点蚀 温度分布 应力集中 电流边缘效应 有限元分析模型 

分 类 号：TG453[金属学及工艺—焊接]