CuNiCoBe与CuCrZr合金电极的点焊性能比较及其失效分析
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摘要
文中对比研究了CuNiCoBe合金与CuCrZr合金电极点焊镀锌钢板的性能,并利用超景深显微镜,光谱仪、XRD等分析测试手段研究了电极表面的剥落、端部塑性变形的程度及表面合金层的成分和物相等,分析了电极失效机理.结果表明,在相同的点焊工艺参数下,CuNiCoBe电极点焊寿命达到3 500点,为CuCrZr电极寿命1 500点的2.3倍.CuCrZr电极寿命低于CuNiCoBe电极的原因在于CuCrZr合金强度硬度低,易形成剥落孔洞、塑性变形大,电极端部尺寸增大明显.表面合金层的成分和产物和CuNiCoBe电极的不尽相同.
The spot-welding performances of galvanized steel were compared between and CuNiCoBe and CuCrZr electrodes.The peeling of electrode surface,the degree of plastic deformation of the end portion and the composition and phases of the surface layer were studied by means of super depth of field microscope,Spectrometer,XRD and so on,and the failure mechanism of electrodes were analyzed.The results had shown that at the same parameters,the life of CuNiCoBe electrode is 3500 points,which is 1.3 times higher than that of CuCrZr electrode,which mainly caused by the low intensity and hardness of CuCrZr alloy,large possibility to form peeling holes,the large size of plastic deformation and apparent increase of size of electrode tip.The compositions and products of surface layer of CuCrZr electrode is not the same as that of CuNiCoBe electrode.
The spot-welding performances of galvanized steel were compared between and CuNiCoBe and CuCrZr electrodes.The peeling of electrode surface,the degree of plastic deformation of the end portion and the composition and phases of the surface layer were studied by means of super depth of field microscope,Spectrometer,XRD and so on,and the failure mechanism of electrodes were analyzed.The results had shown that at the same parameters,the life of CuNiCoBe electrode is 3500 points,which is 1.3 times higher than that of CuCrZr electrode,which mainly caused by the low intensity and hardness of CuCrZr alloy,large possibility to form peeling holes,the large size of plastic deformation and apparent increase of size of electrode tip.The compositions and products of surface layer of CuCrZr electrode is not the same as that of CuNiCoBe electrode.
引文
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[2]邹家生,王涛,沈乔,等.镀锌钢板电阻点焊涂层电极与普通电极寿命分析[J].焊接学报,2011,32(11):53-56.Zou Jiasheng,Wang Tao,Shen Qiao,et al.Investigation on life of coated electrode and traditional electrode for resistant spot welding of Zn-coated steels[J].Transactions of the China Welding Institution,2011,32(11):53-56.
[3]中国机械工程学会焊接学会电阻焊专业委员会.电阻焊理论与实践[M].北京:机械工业出版社,1992.
[4]王敏,唐逸民,周萍.镀锌钢板点焊的工艺性能[J].上海交通大学学报,1999(2):32-34.Wang Min,Tang Yiming,Zhou Ping.Spot welding technology of zinc-coated steels[J].Journal of Shanghai Jiaotong University,1999,33(2):32-34.
[5]张益明,马荣贵,符寒光.耐蚀热镀锌钢板在汽车工业中应用的进展[J].腐蚀与防护,1999,20(11):483-487.Zhang Yiming,Ma Ronggui,Fu Hanguang.Development in the application of corrosion-resistant hot dip galvanizing strip for automobile[J].Corrosion&Pretection 1999,20(11):483-487.
[6]汤精明,姜忠宇,石平.点焊电极表面电火花强化Ti CTi B2涂层[J].材料热处理学报,2012,33(3):133-136.Tang Jingming,Jiang Zhongyu,Shi Ping.Research on Ti C-Ti B2coating on tip surface of spot-welding electrode prepared by electrical discharge hardening[J].Transactions of Materlals and Heat Treatment,2012,33(3):133-136.
[7]董仕节,Zhou Norman.点焊镀锌钢板时电极表面熔敷Ti C涂层对电极失效的影响[J].中国有色金属学报,2005(2):184-191.Dong Shijie,Zhou Norman.Effect of Ti C coating on electrode tip surface on electrode degradation during resistance spot-welding zinc coated steel[J].The Chinese Journal of Nonferrous Metals,2005(2):184-191.
[8]廉金瑞,吴志生,单平,等.点焊镀锌钢板的电刷镀电极的微观结构与点焊工艺[J].兵器材料科学与工程,2002,25(6):29-33.Lian Jinrui,Wu Zhisheng,Shan Ping,et al.Effect of brushing Co of electrodes on performance of spot welding process of zinc coated steel sheets[J].Ordnance Material Science and Engineering,2002,25(6):29-33.
[9]吴志生,单平,廉金瑞,等.深冷处理提高镀锌钢板点焊电极寿命的机理[J].焊接学报,2003(2):7-10.Wu Zhisheng,Shan Ping,Lian Jinrui,et al.Mechanism of improving life of electrode by cryogenic treatment with welding galvanized steel[J].Transactions of the China Welding Institution,2003(2):7-10.
[10]王璐,钱静峰,王敏.镀锌钢板点焊电极寿命预测[J].焊接学报,2006(7):109-112.Wang Lu,Qian Jingfeng,Wang Min.Prediction of electrode life with welding galvanized steel[J].Transactions of the China Welding Institution,2006(7):109-112.
[11]赵熹华.压力焊[M].北京:机械工业出版社,2003.
[12]中国机械工程学会焊接学会.焊接手册第1卷[M].北京:机械工业出版社,2008.
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