Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Comparison of Spot Weldability with Electrode Force Changes in Surface Roughness Textured Steel

가압력 변화에 따른 표면조도처리 강판의 저항 점 용접성 비교

  • Park, Sang-Soon (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Park, Yeong-Do (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Kim, Ki-Hong (Dept. of Advanced Material Engineering, Dong-eui University) ;
  • Choi, Yung-Min (Automotive Steel Products Research Group, Technical Research Labs., POSCO) ;
  • Rhym, Young-Mok (Korea Institute of Materials Science Materials Test & Characterization Group) ;
  • Kang, Nam-Hyun (Division of Materials Science and Engineering, Pusan National University)
  • 박상순 (동의대학교 신소재공학과) ;
  • 박영도 (동의대학교 신소재공학과) ;
  • 김기홍 (동의대학교 신소재공학과) ;
  • 최영민 (POSCO 기술연구소 자동차소재연구그룹) ;
  • 임영목 (한국기계연구원) ;
  • 강남현 (부산대학교 재료공학부)
  • Published : 2008.04.30
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Abstract

With the development of surface roughness textured steel for automotive body-in-white assemble, one of key issues is to understand the role of the surface roughness in textured steel sheets. To investigate effect of surface roughness on weldability in prepared steels, electrode force was varied. Steel sheets (T-H) with high surface roughness ($Ra\;=\;1.94\;{\mu}m$) reduced electrode life. It was attributed to the higher contact resistance at the electrode-sheet interface in the presence of the high surface roughness. The increased electrode diameter decreased current density, therefore reducing weld electrode life due to small weld button size. When an increased electrode force was used, a significant increase in the electrode life was observed in welding of high surface roughness steel sheet. This study suggested that contact resistance at the electrode-sheet interface was the dominant factor, as compared to the sheet-sheet interface for determining electrode life in welding of surface roughness textured steel.

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References

  1. G. S. Kim, C. W. Jeong, S. K. Jang: Characterization of Image Clarity and Clarity and Surface Texture for Temper Rolled Sheet Steel, Proc. J. Kor. Inst. Met. &Mater., (1995), 386 (in Korean)
  2. S. H. Han, S. Y. Heo: Effect of Initial Surface Roughness of Rolls on Image Clarity and Surface Roughness Properties of Cold Rolled Steel Sheets, Proc. J. Kor. Inst. Met. &Mater., (1998), 218 (in Korean)
  3. K. H. Kim, S. S. Park, Y. D. Park: The Resistance Spot Weldability of surface roughness textured cold-rolled steel sheet, Proceeding of the KWS, 48 (2007), 342 - 344 (in Korean)
  4. Quanfeng Song, Wenqi Zhang: An Experimental Study Determines the Electrical Contact Resistance in Resistance, Welding Journal, 84-5 (2005), 73-s to 76-s
  5. Mohamed Abu-Aesh: Influence of the sheet surface roughness on the resistance spot welding of 0.45% carbon steel, Australasian Welding Journal, 48 (2003), 34 - 41
  6. W. B. Ittner and P. J. Magill: A survey of contact resistance theory for nominally clean surfaces, IBM Journal, January (1957), 44 - 47
  7. J. G. Kaiser, G. J. Dunn and T. W. Eagar: The effect of electrical resistance on nugget formation during spot welding, Welding Journal, 61-6 (1982), 167-s to 174-s
  8. Y. J. Cho, S. H. Rhee, H. I. Shin and K. M. Bae: Characterization of Primary Dynamic Resistance in Resistance Spot Welding, Journal of KWS, 17-2 (1999), 97 - 103 (in Korean)
  9. Y. J. Cho: A Study of Dynamic Resistance Monitoring and Intelligent Quality Estimation for the Manufacturing Process Automation during Resistance Spot Welding, P h. D. dissertation, Hanyang Univ., Seoul, Korea, (2000), 51-57 (in Korean)
  10. Kevin Randall Chan: Weldability and degradation study of coated electrodes for resistance spot welding, P h. D. dissertation, Waterloo Uni., Ontario, canada, (2005)
  11. N. T. Williams and J. D. Parker: Review of resistance spot welding of steel sheets -Part 1 Modelling and control of weld nugget formation, International Materials Reviews, 49-2 (2004), 47-75
  12. N. T. Williams and J. D. Parker: Review of resistance spot welding of steel sheets -Part 2 Factors influencing electrode life, International Materials Reviews, 49-2 (2004), 77 - 108 https://doi.org/10.1179/095066004225010541
  13. G. Le Meur, B. Bourouga and T.Dupuy: Measurement of contact parameters at electrode /sheet interface during resistance spot welding process, Science and Technology of Welding & Joining 8-6 (2003), 415 - 422 https://doi.org/10.1179/136217103225005589