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http://dx.doi.org/10.3365/KJMM.2011.49.1.064

Assessment of Resistance Spot Weldability of Dissimilar Joints of Austenitic Stainless Steels/IF Steels and Ferritic Stainless Steels/IF Steels  

Lee, Jin-Beom (Department of Materials Science and Engineering, Pusan National University)
Kim, Dong-Cheol (Advanced Welding & Joining R&D Department, Korea Institute of Industrial Technology)
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, Soon-Kook (Department of Advanced Materials Engineering, Dong-Eui University)
Yu, Ji-Hun (Korea Institute of Materials Science)
Rhym, YoungMok (Korea Institute of Materials Science)
Park, Yeong-Do (Department of Advanced Materials Engineering, Dong-Eui University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.1, 2011 , pp. 64-72 More about this Journal
Abstract
The spot weldability of dissimilar metal joints between austenitic stainless steels (STS316)/IF steels and ferritic stainless steels (STS430)/IF steels was 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, tensile-shear strength, hardness, and microstructure. The comparison of these results was described in terms of fracture behavior. Compared with the weld lobe of similar metal joints, dissimilar metal joints (STS430/IF) had reduced weld current range. However, the weld lobe of STS316/IF steel joint showed increased weld current range. This is because the dilution of chemical composition in the molten weld pool suppressed the heat input being caused by Joule heat with current flow through the samples. The microstructure of the fusion zone was fully martensite and mixture of ferrite and martensite for austenitic stainless steel/IF steel and ferritic stainless steel/IF steel combination, respectively. The experimental results showed that the shape of nugget was asymmetric, in which the fusion zone of the austenitic and ferritic stainless steel sheet was larger due to the higher bulk-resistance. The predicted microstructure by using the Schaeffler diagram was well matched with experimental results. After peel test, the fracture was initiated from heat affected zone of ferritic stainless steel sheet side, however the final fracture was propagated into the IF steel sheet side due to its lower strength.
Keywords
alloys; joining; fracture; tensile test; dissimilar joints;
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