Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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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
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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

References

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