Browse > Article
http://dx.doi.org/10.7467/KSAE.2014.22.4.030

Effects of Electrode Shape on Electrode Life of Resistance Spot Welding of Mg Alloy  

Choi, Dongsoon (Advanced Welding & Joining Group, Korea Institute of Industrial Technology)
Kang, Moonjin (Advanced Welding & Joining Group, Korea Institute of Industrial Technology)
Ryu, Jaewook (MKE Metal R&D Support Platform, KOMERA)
Kim, Dongcheol (Advanced Welding & Joining Group, Korea Institute of Industrial Technology)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.22, no.4, 2014 , pp. 30-35 More about this Journal
Abstract
According to weight lightning trend of automobile body, necessity of resistance spot welding (RSW) of Mg alloy on automobile industry is increasing rapidly because of the highest specific strength among commercial metals. Mg alloy has low electric resistance and high thermal conductivity like as Al alloy, so that needs applying high current in short time when welding. Thick oxide film of Mg alloy pollutes the electrodes and makes partial current carrying paths when on welding. Partial current carrying paths signify excessive concentration of current. There can initiate expulsion easily and reduces electrode life rapidly. Generating partial current carrying paths and expulsions are influenced by shapes of electrode. Therefore, electrode life also influenced by shape. In this study, we perform life test of RSW electrode of radius type. Measure tensile shear load and nugget size every spot alternately. As a result, radius type electrode can extend life over twice as dome type electrode.
Keywords
Resistance spot welding; Mg alloy; Electrode life test; Electrode shape; Radius type electrode;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 S. N. Jung, H. S. Chang and M. Y. Lee, "A Study on Servo DC Resistance Spot Welding of Mg Alloy Sheet(1)," KWJS, Vol.27, No.1, pp.102-107, 2009.   과학기술학회마을   DOI   ScienceOn
2 T. W. Yoon, R. H. Kim, M. Y. Lee and K. H. Lee, "The Development of Car Body Part Using Mg AZ31B," KSAE Annual Conference Proceedings, pp.97-101, 2012.
3 J. H. Lee and S. H. Kang, "Forming Technologies of Magnesium Alloy Sheet and Automobile Applications," Auto Journal, KSAE, Vol.29, No.6, pp.24-31, 2007.
4 M. Y. Lee, "Recent Trends in Welding of Magnesium Alloy," Abstracts of 2012 Autumn Annual Meeting of KWJS, Vol.57, pp.111-117, 2012.
5 L. Xiao, L. Liu, Y. Zhou and S. Esmaeiri, "Resistance-spot-welded AZ31B Magnesium Alloys: Part I. Dependence of Fusion Zone Microstructures on Second-phase Particles," Metallurgical and Materials Transactions A, Vol.41A, No.6, pp.1511-1522, 2010.
6 D. S. Choi, I. S. Hwang, D. C. Kim and M. J. Kang, "Electrode Life Test of Resistance Spot Welding on Mg Alloy Using Dome Type Electrode," KWJS, Vol.31, No.6, pp.27-31, 2013.   과학기술학회마을   DOI   ScienceOn
7 L. Liu, S. Q. Zhou, Y. H. Tian, J. C. Feng, J. P. Jung and Y. N. Zhou, "Effects of Surface Conditions on Resistance Spot Welding of Mg Alloy AZ31B," Science and Technology of Welding and Joining, Vol.14, No.4, pp.356-361, 2009.   DOI
8 I. S. Hwang, D. C. Kim and M. J. Kang, "Inverter DC Resistance Spot Welding of Magnesium Alloy AZ31B," Archive of Material Science and Engineering, Vol.48, No.2, pp.112-117, 2011.
9 KS B ISO 18278-2, Resistance Welding-Weldability-Part 2 : Alternative Procedures for the Assessment of Sheet Steels for Spot Welding, KS Standard, 2005.
10 Y. S. Han and K. T. Rie, "A Study of Thermoelectric Effect in Resistance Spot Welding of Aluminium Alloy," Transactions of KSAE, Vol.6, No.5, pp.10-19, 1998.   과학기술학회마을