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Title
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RSM OPTIMIZATION OF RSW PROCESS ON TENSILE SHEAR FRACTURE LOAD
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Type
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Refereeing
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Keywords
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Optimization, Dissimilar joints, RSM, Macroscopic examination, Tensile shear test, RSW
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Abstract
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The stainless steels such as Austenitic Stainless Steel (ASS) and Duplex Stainless Steel (DSS) are joined to optimize the Resistance Spot Welding (RSW) process parameters and predict the parametric influence on the response of Tensile Shear Fracture Load (TSFL). The Response Surface Methodology (RSM) is an optimization technique that is used for optimizing the process parameters on TSFL and with the help of these results; a satisfactory quadratic mathematical model has been developed to predict the response. The optimal parameters and their levels are found and reported as follows: welding current = 9 kA, welding time = 0.18 seconds and electrode tip radius = 3 mm. The actual and predicted values of TSFL for the optimized parameters are 17.6 kN and 17.9 kN respectively. The developed quadratic model is efficiently predicted the response with an average error percentage of 2.18. The significant and insignificant terms in the models has been identified by 95% confidence level using ‘p’ test. The insignificant terms are removed from the model and the ANOVA table is formulated only with the significant terms. Significance of each term in the ANOVA table is identified based on the percentage of contribution and noticed that welding current has the highest significance (46%) on TSFL. The macroscopic examination confirmed that the larger nugget is observed during the maximum welding current due to the high heat generation. Smaller nugget length is observed at the minimum welding time, because, the allowable time for current flow is limited. Also, the TSFL and nugget length are positively correlated.
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Researchers
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Mohammad Saeed Goodarzi (Referee)
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