Cu/Al levhaların sürtünme karıştırma kaynağında Taguchi metodu ile çekme mukavemeti ve sertlik için optimum kaynak parametrelerinin tahmini

Abstract

Highlights:Graphical/Tabular Abstract  Joining of copper and aluminum sheets with friction stir welding  Determination of optimal friction stir welding parameters for highest ultimate tensile strength and hardness values  Development of regression equation for ultimate tensile strength and hardness Figure A. Process principle of dissimilar Friction Stir Welding (FSW)Purpose: The aim of the study was predicted the mechanical properties (ultimate tensile strength (UTS) and hardness) of friction stir welded pure copper and 1050 aluminum alloy joints. Theory and Methods:The Taguchi method was used to optimize FSW parameters for improving mechanical behavior of Cu/Al joints. Experiments were conducted via Taguchi L9 orthogonal array. The assessment of the experimental results was based upon the signal to noise ratio. Tool rotational speed, tool transverse speed and tool position were considered as control factors for UTS and hardness. Analysis of variance (ANOVA) and main effect plot were utilized to detect the substantial parameters and set the optimal level for each parameter. A confirmation test was carried out to verify the optimized results. Results:Considering the ANOVA results, the percent contributions of the tool rotational speed, tool transverse speed and tool position factors on UTS were found to be 14.13 %, 7.32 % and 76.88 % respectively. This showed that the most effective factor on UTS was tool position. Moreover, the most significant factor on hardness was found as tool position 80.76 %, while the tool transverse speed was second ranking factor 10.01 % and tool rotational speed was the least 7.39%. A linear regression was derived to estimate each output characteristic. The experimental and estimated values were in a good agreement with of 0.82 and 0.86 for UTS and hardness, respectively. For UTS and hardness, the mean absolute percentage error (MAPE) between actual and Taguchi predicted values were computed as 3.37 % and 1.74 %, respectively. Conclusion:According to the optimization results, the best condition for the mechanical characteristics was obtained with a tool rotational speed 525 rpm, tool transverse speed of 50 mm/min and tool position of 1.5 mm. It was determined that in UTS and hardness, the most effective parameter is tool position. The results acquired were validated by performing confirmation tests, the results of which verify the adequacy and effectiveness of this approach.In this study, the effect of welding parameters on the performance characteristic in the friction stir welding of Cu/Al plates were experimentally investigated. Experiments were designed according to Taguchi L9 orthogonal array. The evaluation of the experimental results was based on the signal/noise (S/N) ratio. Control factors that given optimum ultimate tensile strength and vickers hardness values determined by using Taguchi method. Three different tool rotational speeds (525, 1025 and 1525 rev/min), tool transverse speeds (50, 75 and 100 mm/min) and tool positions (0, 0.75 and 1.5 mm) as control factors have b...

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