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    Investigation of mechanical and microstructural properties of welded specimens of aa6061-t6 alloy with friction stir welding and parallel-friction stir welding methods

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    Article (7.176Mb)
    Date
    2021-10-12
    Author
    Ghiasvand, Amir
    Yavari, Mohammad Mahdi
    Tomków, Jacek
    Grimaldo Guerrero, John William
    Kheradmandan, Hasan
    Dorofeev, Aleskei
    Memon, Shabbir
    Aghajani Derazkola, Hesamoddin
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    Citation
    Ghiasvand, A., Yavari, M. M., Tomków, J., Guerrero, J. W. G., Kheradmandan, H., Dorofeev, A., . . . Derazkola, H. A. (2021). Investigation of mechanical and microstructural properties of welded specimens of aa6061-t6 alloy with friction stir welding and parallel-friction stir welding methods. Materials, 14(20) doi:10.3390/ma14206003
    Abstract
    The present study investigates the effect of two parameters of process type and tool offset on tensile, microhardness, and microstructure properties of AA6061-T6 aluminum alloy joints. Three methods of Friction Stir Welding (FSW), Advancing Parallel-Friction Stir Welding (AP-FSW), and Retreating Parallel-Friction Stir Welding (RP-FSW) were used. In addition, four modes of 0.5, 1, 1.5, and 2 mm of tool offset were used in two welding passes in AP-FSW and RP-FSW processes. Based on the results, it was found that the mechanical properties of welded specimens with AP-FSW and RP-FSW techniques experience significant increments compared to FSW specimens. The best mechanical and microstructural properties were observed in the samples welded by RP-FSW, AP-FSW, and FSW methods, respectively. Welded specimens with the RP-FSW technique had better mechanical properties than other specimens due to the concentration of material flow in the weld nugget and proper microstructure refinement. In both AP-FSW and RP-FSW processes, by increasing the tool offset to 1.5 mm, joint efficiency increased significantly. The highest weld strength was found for welded specimens by RP-FSW and AP-FSW processes with a 1.5 mm tool offset. The peak sample of the RP-FSW process (1.5 mm offset) had the closest mechanical properties to the base metal, in which the Yield Stress (YS), ultimate tensile strength (UTS), and elongation percentage (E%) were 76.4%, 86.5%, and 70% of base metal, respectively. In the welding area, RP-FSW specimens had smaller average grain size and higher hardness values than AP-FSW specimens.
    Description
    Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
    URI
    https://doi.org/10.3390/ma14206003
    https://soar.wichita.edu/handle/10057/22249
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