Modeling and Optimization of Friction Stir Welding Parameters for Joining Dissimilar Aluminum Alloys

Mohamed Mohamed Abd Elnabi; Tarek Abd Elsadek Osman; Alaa Eldeen El Mokadem; Abou Bakr ElshalakanyÂ

doi:10.21467/ajgr.4.1.1-14

Authors

Mohamed Mohamed Abd Elnabi Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt
Tarek Abd Elsadek Osman Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt
Alaa Eldeen El Mokadem Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt
Abou Bakr ElshalakanyÂ Production Engineering and Printing Technology Department, Engineering Department, Akhbar El Yom Academy, 6th of October City, Egypt

DOI:

https://doi.org/10.21467/ajgr.4.1.1-14

Abstract

The objectives of this work are to optimize the process parameters on the mechanical properties (ultimate tensile strength (UTS) and ductility) of dissimilar joints between AA5454 and AA7075 produced by friction stir welding and to determine which of them is significant by using Taguchi L16 optimization method. Seven parameters at two levels were selected in this study. The selected parameters are tool rotational speed, traverse speed, pin profile (based on taper angle), D/d ratio, tool tilt angle, plunge depth, and base metal location. Then, mathematical models are built as function of significant parameters/ interactions using Response Surface Methodology. The results of this work showed that the rotational speed, traverse speed, D/d ratio and plunge depth are significant parameters in determining UTS (Mean, Signal to noise ratio (S/N)) at different confidence levels, but pin profile, location of base metal and tool tilt angle are insignificant parameters at any confidence levels. The traverse speed has the highest contribution to the process for UTS about 18.577 % and 16.943 % for S/N ratio and mean, respectively. The accuracy of the models according to the UTS is 97.678 % and 99.56 %for mean and S/N ratio, respectively. The maximum joint efficiency, compared to the strength of the AA5454, is 85.3%.

Keywords:

Friction Stir Welding, Dissimilar Metals, Taguchi Method, Response Surface Methodology, Tensile Strength, Ductility, Process Parameter

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