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    Volume 48, Issue 5 (December 2018)

    The Effect of Aging and Burnishing Treatment on Parts Joined by Friction Stir Welding

    (Received 5 January 2018; accepted 20 July 2018)

    Published Online: 06 December 2018

    CODEN: JTEVAB

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    Abstract

    In this study, the AA7075 aluminum alloy plates were joined by a friction stir–welding (FSW) method. Then, the effects of aging and burnishing treatments on the mechanical and microstructural properties of the joints were examined. First, the Al-7075 parts were joined with this method, and then only burnishing, only aging, and aging-plus-burnishing treatments were applied to the FSW specimens. The tensile and bending strengths were examined for all test specimens. Moreover, microhardness measurements and microstructural analyses were performed after all processes. It was seen that the aging and burnishing processes each had an improving effect on the mechanical properties of the stir-welded zone. The results also showed that the combined application of these two methods (aging plus burnishing) had an adverse effect on the parts joined with FSW. Furthermore, according to X-ray diffraction analyses, precipitates, such as magnesium silicide (Mg2Si), magnesium-aluminum-copper, and copper dialuminide (Al2Cu) as well as aluminum oxide formations, were observed at the weld region. Among these precipitates, while bending strength improved because of the Mg2Si formation, formation of Al2Cu precipitates adversely affected both tensile and bending strengths.

    Author Information:

    Sonmez, Fikret
    Karsiyaka Tupras Vocational and Technical Anatolian High School, Basiskele, Kocaeli

    Basak, Hudayim
    Faculty of Technology, Department of Industrial Design Engineering, Gazi University, Ankara,

    Gural, Ahmet
    Faculty of Technology, Department of Metallurgical and Materials Engineering, Gazi University, Ankara,

    Taskesen, Ahmet
    Faculty of Technology, Department of Industrial Design Engineering, Gazi University, Ankara,


    Stock #: JTE20180007

    ISSN:0090-3973

    DOI: 10.1520/JTE20180007

    Author
    Title The Effect of Aging and Burnishing Treatment on Parts Joined by Friction Stir Welding
    Symposium ,
    Committee B07