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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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Electrode degradation mechanism during resistance spot welding of zinc coated steel using Cu-TiB2 electrodes
DONG Shi-jie(董仕节)1, ZHOU Norman2, CHENG Chang-kun(程长坤)1
SHI Yao-wu(史耀武)3, CHANG Bao-hua(常保华)4 

1. Department of Material Engineering, Hubei Automobile Industrial Institute, 
Shiyan 442002, China; 
2. Department of Mechanical Engineering, University of Waterloo, Waterloo, 
Ontario, N2L 3G1, Canada; 
3. School of Materials Science and Engineering, Beijing Polytechnic University, 
Beijing 100022, China; 
4. School of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Abstract: The TiB2 dispersion-reinforced copper-matrix composite used as electrode material in resistance spot welding of zinc coated steels was studied. The service life of the composite electrode reaches 7700 welds, which is 4 times that of the conventional Cu-Cr-Zr electrode. Little gross deformation is observed on the composite electrodes because of the higher thermal strength; therefore, it is believed that wear is the only mechanism for the composite electrode deterioration. However, both wear and plastic deformation are responsible for the large increase in the tip diameter of the Cu-Cr-Zr electrodes. Moreover, the large deformation of the Cu-Cr-Zr electrodes may contribute to the increased wear rate of the tips.

 

Key words: Cu-TiB2 electrodes; electrode materials; resistance spot welding; TiB2 dispersion-reinforced copper-matrix composite; zinc coated steels; degradation mechanism

ISSN 1672-7029
CN 43-1423/U

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