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http://dx.doi.org/10.3740/MRSK.2009.19.7.369

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

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)
Publication Information
Korean Journal of Materials Research / v.19, no.7, 2009 , pp. 369-375 More about this Journal
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
resistance spot welding; dissimilar materials; austenitic stainless steels; dilution; low carbon galvanized steels;
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