Strengthening Mechanism of TiB2-TiC Complex Phases Coated Electrode

Abstract:

TiB2-TiC complex phases coating deposited onto the surface of electrodes by electro-spark deposition (ESD) in order to prolong the life of single phase coated electrode (TiB2 or TiC) during resistance welding of galvanized steels. The microstructures and TiB2-TiC complex phases coatings were characterized by SEM and XRD. The results indicate that life of TiB2-TiC complex phases coated electrode is prolonged significantly than life of single-phase coated electrode （TiB2 or TiC ）, failure mechanism of TiB2-TiC complex phases coated electrode is mainly wear to cause diameter increase on electrode tip, which results in lower current density during welding process, and then nugget size cannot satisfy the requirement of resistance spot welding. The failure mechanism of TiB2-TiC complex phases coated electrode is obviously different from uncoated electrode, the failure mechanism of uncoated electrode is wear and alloying between electrode tip surface and molten Zn on galvanized steel weld surface.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 251-255
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.251
• Online since: January 2012
• Authors: Ping Luo, Shi Jie Dong, Zhang Qiang Mei, Zhi Xiong Xie
• Keywords: Complex Phases Coating, Electric Resistance Welding, TiB2-TiC

References

[1] Z. Chen, N. Scotchmer and N. Zhou, Materials Science & Technology, (2005), p.59

[2] Z.S. Wu, P. Shan, J.R. Lian and S.X. Hu, Transactions of The China Welding, Vol.24 (2003) No.2, p.7 (in Chinese)

[3] Z.S. Wu, J.R. Lian, S.X. Hu and F.J. Cheng, Automobile Technology, (2003) No.2, p.35 (in Chinese)

[4] F.M. Bai, J.R. Lian and P. Shan, Electric Welding Machine Vol.33 (2003) No.4, p.9 (in Chinese)

[5] J.R. Lian, Z.S. Wu and P. Shan, Ordnance Material Science and Engineering, Vol.25 (2002) No.6, p.29 (in Chinese)

[6] C.K. Cheng, H.J. Li and Z.X. Xie, Journal of Hubei Automotive Industries Vol.18 (2004) No.2, p.30 (in Chinese)

[7] C. Luo, S.J. Dong, X. Xiong and Y. Zhou, Surface & Coatings Technology, 203(2009), p.3333

[8] J .D.Vallauri, I.C. At´ıas Adri´an and A. Chrysanthou: Journal of the European Ceramic Society, 28 (2008), p.1697

[9] Z. Chen and Y. Zhou, Surface & Coatings Technology, 201 (2006), p.1503

[10] ANSI/AWS/SAE/D8.9-97, "Recommended practices for test methods for evaluating the resistance spot welding behaviour of automotive sheet steel materials", AWS/SAE, (1997)

[11] Tanaka, Y. Sakaguchi and M.Shirasawa, Int. J. of Materials and Product Tech, Vol. 2(1987) No.1, p.64

[12] S. Babu and S.Santella, "Modeling Resistance Spot Welding Electrode Life", Oak Ridge National Laboratory, 2000??

[13] Saito.T, Takahashi.Y, Nishi.T, Nippon Steel Technical Report, (1988) No. 37, p.24