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Effect of Material Properties and Process Parameters on Morphology and Strength of Friction-Stir-Welded Dissimilar T-Joints

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Abstract

The influence of the material properties and the process parameters on the mechanical behavior of friction-stir-welded dissimilar T-joints of AA5083-H111 and AA6082-T6 aluminum alloys was investigated. The welds were produced in 3-mm-thick plates, in a T-joint configuration, but using each material either as the skin or as the stringer. Two different tools, with the same design of the shoulder and the initial part of the progressive pin, cylindrical threaded, but with different pin tip geometry, one conical threaded and the other pyramidal, were used. The transverse speed was varied between 30 and 220 mm/min. The results show that it is possible to produce welds without any defects and or reduction in the skin thickness as well as with an excellent filling of the fillets. The flow of material in the welds is very much conditioned by the geometry of the progressive pin of the tools. The welds produced with a higher traverse speed and using the threaded pin tool presented higher tensile strength than those performed with the pyramidal pin tool. The weld series in which the AA5083 alloy was used as the skin exhibited greater tensile and fatigue strength than the welds where the AA6082 alloy was used as the skin.

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Acknowledgments

The authors are indebted to the Portuguese Foundation for Science and Technology (FCT) for their financial support through the Project UID/EMS/00285/2013. The Author N. Manuel is supported by the Ministério das Pescas from Angola through fellowships. All supports are gratefully acknowledged. The authors also thank Thyssen Portugal–Steels and Services Ltd., Marinha Grande, for providing the heat treatments for the friction stir welding tools.

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  1. CEMMPRE, Mechanical Engineering Department, University of Coimbra, Rua Luís Reis Santos, 3030-788, Coimbra, Portugal

    N. Manuel, J. M. Costa & A. Loureiro

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  1. N. Manuel
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Correspondence to N. Manuel.

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Manuel, N., Costa, J.M. & Loureiro, A. Effect of Material Properties and Process Parameters on Morphology and Strength of Friction-Stir-Welded Dissimilar T-Joints. J. of Materi Eng and Perform 28, 5233–5244 (2019). https://doi.org/10.1007/s11665-019-04240-7

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  • DOI: https://doi.org/10.1007/s11665-019-04240-7

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