微型点焊时电极表面熔敷TiC涂层对电极失效的影响  

Effect of TiC coating on electrode tip surface on electrode degradation during micro-resistance spot welding

作　　者：董仕节[1] ZHOU Norman 

机构地区：[1]湖北汽车工业学院材料工程系,十堰442002 [2]Department of Mechanical Engineering University of Waterloo Waterloo,Ontario N2L 3G1,Canada

出　　处：《中国有色金属学报》2005年第10期1512-1519,共8页The Chinese Journal of Nonferrous Metals

基　　金：湖北省教育厅创新团队资助项目(鄂教科[2003]7号);教育部留学回国人员科研启动基金资助项目(教外司留[2004]527号)

摘　　要：研究了表面处理对微型点焊镀镍钢板和镍板时电极失效的影响。结果表明:微型点焊镀镍钢板和镍板时电极的失效主要是电极头部的塑性变形以及电极和镀镍板之间局部焊接的断裂发生在电极表面而导致的电极磨损;表面涂敷TiC的CuCrZr电极的寿命(1 200点)是CuCrZr电极寿命(600点)的两倍,表面处理能提高电极寿命的主要原因是表面涂敷的TiC颗粒能阻碍电极和镀镍板之间的局部焊接,以及减小电极表面的塑性变形。The effects of TiC coating on electrode tip surface on electrode degradation mechanism were studied during micro-resistance spot welding of nickel-plated steel to nickel sheet. The results indicate that the electrode degradation mechanism is basically caused by deformation at electrode tip and wear due to fracture of local welding between the electrode tip face and sheet happened at electrode surface during micro-resistance spot welding of nickelplated steel to nickel sheet. The electrode tip life of CuCrZr electrode with TiC coating （1 200 welds） doubles that of CuCrZr electrode （600 welds）, because the TiC particles contained in the coating deposits can prevent local welding between the electrode surface and nickel-plated steel, then decrease the deformation of electrode surface.

关 键 词：镀镍钢板 微型点焊 电极失效机制 表面处理 

分 类 号：TG431[金属学及工艺—焊接]