| XIAO Yao,LI Zhi,QIN Fu-cheng,WANG Chong,DONG Shi-jie,LUO Ping.Failure Process Analysis of Electrodes with TiB2-ZrB2/Ni Coatings for Spot Welding Galvanized Steel Sheet[J],47(1):142-148 |
| Failure Process Analysis of Electrodes with TiB2-ZrB2/Ni Coatings for Spot Welding Galvanized Steel Sheet |
| Received:July 10, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.022 |
| KeyWord:TiB2-ZrB2/Ni coatings resistance spot welding electrode failure alloying plastic deformation failure analysis |
| Author | Institution |
| XIAO Yao |
1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan , China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan , China |
| LI Zhi |
1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan , China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan , China |
| QIN Fu-cheng |
1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan , China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan , China |
| WANG Chong |
1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan , China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan , China |
| DONG Shi-jie |
1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan , China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan , China |
| LUO Ping |
1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan , China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan , China |
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| Abstract: |
| The work aims to reveal failure mechanism of electrodes with TiB2-ZrB2/Ni coatings for spot welding galvanized steel sheet. Changes in surface structure, phase and properties of the coatings for spot welding galvanized steel sheet were characterized with scanning electron microscopy, X-ray diffractometer and microhardness test, respectively. Applying TiB2-ZrB2/Ni coatings to electrodes could significantly improve service life of spot-welding electrodes by nearly 5 times. Surface hardness of electrodes was obviously increased by the ZrB2-TiB2/Ni coatings, which slowed down plastic deformation on tips of coated elec¬trodes. In addition, the ZrB2-TiB2/Ni coatings could mitigate alloying reaction between steel sheet coatings and spot-welding electrodes to some extent. The coatings will not drop off completely during the process of spot welding as ZrB2-TiB2/Ni-coated electrodes are of certain plasticity. The coatings acts until the electrodes fail, and primary form of electrode failure is plastic deformation. |
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