Optimization of resistance spot welding process parameters and microstructural examination for dissimilar welding of AISI 316L austenitic stainless steel and 2205 duplex stainless steel
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Resistance spot welding (RSW) involves joining of contacting surfaces by heat generated by resistance to electric current. The process is swift and finds demand in automobile industries for mass production. In spite of all the assets of the process, it yields a poor quality welds and inferior weld strength at the inner region of the joint interface. This may be improved by accurate setting of control parameters. The objective of this study is to determine the effect of various control parameters like electrode tip diameter, welding current, and heating cycle on the nugget size and tensile shear strength of dissimilar metal spot welding of 2-mm-thick AISI 316L austenitic stainless steel and 2205 Duplex Stainless Steel sheets. The Taguchi’s L27 orthogonal array (OA) design is selected to conduct the experimental spot welding trials on the dissimilar materials. Subsequently, the specimens are examined usinganalysis of variance (ANOVA) technique to customize optimal parameter setting to obtain high tensile strength and favorable weld quality characteristics. The results reveal that welding current is the most dictating factor to achieve highest tensile strength with superior weld quality. Also, weld samples are prepared for metallographic examination from cross section areas of resistance spot welds to examine microstructure changes and ferrite content measurement in different regions of weld nugget. The microstructure examination shows that the weld nugget consists of ferrite and austenite and ferrite and there is no precipitate of detrimental phases in the weldment.
KeywordsResistance spot welding SS 316 L 2205 Duplex Stainless Steel ANOVA Microstructure examination Ferrite content Regression analysis Tensile sheer strength
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- 1.Thomson E (1886) Electrical world. McGraw-Hill Publishing Company, New York, pp 307–309Google Scholar
- 6.Thakur AG, Nandedkar VM (2010) Application of Taguchi method to determine resistance spot welding conditions of austenitic stainless steel AISI 304. J Sci Ind Res 69:680–683Google Scholar
- 9.Ugur Eşme (2009) Application of Taguchi Method for the Optimization of Resistance Spot Welding Process. The Arabian Journal for Science and Engineering 34:519–528Google Scholar
- 12.Devendranath Ramkumar K, Singh A, Raghuvanshi S, Bajpai A, Solanki T, Arivarasu M, Arivazhagan N, Narayanan S (2015) Metallurgical and mechanical characterization of dissimilar welds of austenitic stainless steel and super-duplex stainless steel – a comparative study. J Manuf Process 19:212–232CrossRefGoogle Scholar