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Resistance Spot Welding of Dissimilar Materials of Austenitic Stainless Steels and IF (Interstitial Free) Steels

저항 점 용접을 이용한 AISI 316 스테인레스강과 용융아연도금 강판의 이종접합

  • Lee, Jin-Bum (Department of Advanced Materials Engineering, Dong-Eui University) ;
  • Nam, Dae-Geun (Dongnam Technology Service Division, Korea Institute of Industrial Technology) ;
  • Kang, Nam-Hyun (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Yang-Do (Department of Materials Science and Engineering, Pusan National University) ;
  • Oh, Weon-Tae (Department of Nano Engineering, Dong-Eui University) ;
  • Park, Yeong-Do (Department of Advanced Materials Engineering, Dong-Eui University)
  • 이진범 (동의대학교 공과대학 신소재 공학과) ;
  • 남대근 (한국생산기술연구원 동남권지원센터) ;
  • 강남현 (부산대학교 공과대학 재료공학과) ;
  • 김양도 (부산대학교 공과대학 재료공학과) ;
  • 오원태 (동의대학교 공과대학 나노공학과) ;
  • 박영도 (동의대학교 공과대학 신소재 공학과)
  • Published : 2009.07.27

Abstract

The spot weldability of dissimilar metal joints between stainless steels (AISI316) and interstitial free (IF) steels were investigated. This study was aimed to determine the spot welding parameters for a dissimilar metal joint and to evaluate the dissimilar metal joint's weldability, including its welding nugget shape, tensileshear strength, hardness, and microstructure. The fracture surface was investigated by using a Scanning Electron Microscopy (SEM). The experimental results showed that the shape of nugget was asymmetric, in which the fusion zone of the STS316 sheet was larger due to the higher bulk-resistance. The microstructure of the fusion zone was fully martensite. In order to evaluate the microstructure further, dilution of stainless steels were calculated and imposed onto the Schaeffler diagram. The predicted microstructure from the Schaeffler diagram was martensite. In order to confirm the predicted microstructure, XRD measurements were carried out. The results showed that that initial weld nugget was composed of austenite and martensite.

Keywords

References

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