DOI QR코드

DOI QR Code

A comparative study of constant current control and adaptive control on electrode life time for resistance spot welding of galvanized steels

용융아연도금 강판 저항 점 용접 시 정전류 및 적응제어 적용에 따른 연속타점 특성 평가 및 고찰

  • Seo, Jeong-Chul (School of Materials Science and Engineering, Korea Maritime and Ocean University) ;
  • Choi, Il-Dong (School of Materials Science and Engineering, Korea Maritime and Ocean University) ;
  • Son, Hong-Rea (F.A. Engineering Department, Hyundai Motor Company) ;
  • Ji, Changwook (School of Materials Science and Engineering, Pusan National University) ;
  • Kim, Chiho (School of Materials Science and Engineering, Pusan National University) ;
  • Suh, Sung-Bu (Dept. of Naval Architecture & Ocean Eng., Dong-eui University) ;
  • Seo, Jinseok (Division of Digital Contents Technology, Dong-eui University) ;
  • Park, Yeong-Do (Dept. of Advanced Material Engineering, Dong-eui University)
  • 서정철 (한국해양대학교 공과대학 재료공학과) ;
  • 최일동 (한국해양대학교 공과대학 재료공학과) ;
  • 손홍래 (현대자동차 자동화기술부) ;
  • 지창욱 (부산대학교 재료공학과) ;
  • 김치호 (부산대학교 재료공학과) ;
  • 서성부 (동의대학교 조선해양공학과) ;
  • 서진석 (동의대학교 디지털영상공학부) ;
  • 박영도 (동의대학교 신소재공학과)
  • Received : 2015.03.10
  • Accepted : 2015.04.23
  • Published : 2015.04.30

Abstract

With using adaptive control of the resistance spot welding machine, the advantage on electrode life time for galvanized steels has been addressed. This study was aimed to evaluate the electrode life time of galvanized steels with applying the constant current control and the adaptive control resistance spot welding process for a comparison purpose. The growth in diameter of electrode face was similar for both the constant current and the adaptive control up to 2000 welds. The button diameter was decreased with weld numbers, however, sudden increase in button diameter with use of the adaptive control after 1500 welds was observed. The peak load was continuously decreased with increasing number of welds for both the constant current and the adaptive control. The current compensation during a weld was observed with using the adaptive control after 1800 welds since the ${\beta}$-peak on dynamic resistance curve was detected at later weld time. The current compensation with adaptive control during resistance spot welding enhanced the nugget diameter at the faying interface of steel sheets and improved the penetration to thinner steel sheet.

Keywords

Resistance spot welding;Constant current control;Adaptive control;Electrode life time;Tensile shear strength

Acknowledgement

Supported by : 한국연구재단

References

  1. J. Zou, Q. Zhao, and Z. Chen : Surface modified longlife electrode for resistance spot welding of Zn-coated steel, J. Mater Proc Tech. 209 (2009), 4141-4146 https://doi.org/10.1016/j.jmatprotec.2008.10.005
  2. S. S. Park, S. M. Lee, Y. J. Cho, N. H. Kang, J. H. Yu, Y. S. Kim, and Y. D. Park : Evaluation of Resistance Spot Weld Interfacial Fractures in Tensile-Shear Tests of TRIP 590 Steels, J. Kor. Inst. Met. & Mater. 46(10) (2008), 672-682
  3. S. S. Park, Y. M. Choi, D. G. Nam, Y. S. Kim, J. H. Yu, Y. D. Park : A Comparison of Spot Weldability with Electrode Force Changes in Surface Roughness Textured Steel, J. KWJS. 26(2) (2008), 75-84 (in Korean)
  4. S.A. GEDEON, T.W. EAGAR : Resistance Spot Welding of Galvanized Steel:Part II. Mechanisms of Spot Weld Nugget Formation, Metallurgical Transactions B, 17 (1986), 887-901 https://doi.org/10.1007/BF02657152
  5. J.W Son, Y.D Park, M.J Kang, D.C. Kim : A Comparative Study of Single-Phase AC and Inverter DC on Electrode Life for Resistance Spot Welded Electrogalvanized Steel Sheets, J. Kor. Inst. Met. & Mater 47(12) (2009), 834-841
  6. N. Harlin, T.B. Jones, J.D. Parker : Weld growth mechanism of resistance spot welds in zinc coated steel, Journal of Materials Processing Technology 143-144 (2003), 448-453 https://doi.org/10.1016/S0924-0136(03)00447-3
  7. Wu Zhisheng, Shan Ping, Lian Jinrui, Hu Shengsun : Effect of deep cryogenic treatment on electrode life and microstructure for spot welding hot dip galvanized steel, Materials and Design 24(8) (2003), 687-692 https://doi.org/10.1016/S0261-3069(03)00029-3
  8. J.W Son, J.D Seo, D.C Kim, Y.D Park : Effect of Coating Layer on Electrode Life for Resistance Spot Welding of Al-Coated HPF and Zn-Coated Trip Steels, Corrosion Science and Technology, 11(1) (2012), 29-36 https://doi.org/10.14773/cst.2012.11.1.029
  9. X.Q. Zhang, G.L. Chen, Y.S. Zhang : Characteristics of electrode wear in resistance spot welding dual-phase steels, Materials & Design, 29(1) (2008), 279-283 https://doi.org/10.1016/j.matdes.2006.10.025
  10. Y.K. Lee : Adaptive Regulators for Quality Assurance in Resistance Welding, Proceeding of KWJS fall meeting (2009), 119-119 (In Korean)
  11. M. Batista, S. D. Brandi : Use Of Dynamic Resistance And Dynamic Energy To Compare Two Resistance Spot Welding Equipments For Automotive Industry In Zinc Coated And Uncoated Sheets, American Journal of Engineering Research, 02 (2013), 79-93
  12. K.S. Boo, H.S. Cho, S.J.Na : A study on the shunt effect in resistance spot welding, Korean society for precision engineering, 3(2) (1986), 39-54
  13. N.T. Williams, and J. D. Parker : Review of resistance spot welding of steel sheets part 2 factors influencing electrode life, Int. Mater. Reu, 49(2) (2004), 77-108 https://doi.org/10.1179/095066004225010541
  14. Jiho Lim : Prediction of Tensile Shear and Cross Tension Strengths for Spot Welds of Automotive Steel Sheets, The Korean Society of Automotive Engineers, 11 (2010), 2760-2765
  15. KS B 0850 : Method of inspection for spot weld, 4-6
  16. K.H Kim, N.H Kang. Y.D Park : Evaluation on Resistance Spot Weldability and Nugget Formation of Surface Roughness Treated Steel Sheet, J. KWJS, 26(5) (2008), 79-89
  17. D. S. Choi, D. C. Kim and M. J. Kang, Resistance spot welding characteristics of Mg alloy using process tape, J. KWJS, 31(3) (2013), 49-53 (in Korean)