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Effect of welding parameters on microstructure and mechanical properties of AA7075-T6 friction stir welded joints

2011; Wiley; Volume: 34; Issue: 11 Linguagem: Inglês

10.1111/j.1460-2695.2011.01580.x

8756-758X

F. Gemme, Yves Verreman, L. Dubourg, P. Wanjara,

Welding Techniques and Residual Stresses

Fatigue & Fracture of Engineering Materials & StructuresVolume 34, Issue 11 p. 877-886 Effect of welding parameters on microstructure and mechanical properties of AA7075-T6 friction stir welded joints F. GEMME, F. GEMME Mechanical Engineering Department, École Polytechnique de Montréal, Montréal, CanadaSearch for more papers by this authorY. VERREMAN, Y. VERREMAN Mechanical Engineering Department, École Polytechnique de Montréal, Montréal, CanadaSearch for more papers by this authorL. DUBOURG, L. DUBOURG Aerospace Manufacturing Technology Center, Aerospace Research Institute, National Research Council, Montréal, CanadaSearch for more papers by this authorP. WANJARA, P. WANJARA Aerospace Manufacturing Technology Center, Aerospace Research Institute, National Research Council, Montréal, CanadaSearch for more papers by this author F. GEMME, F. GEMME Mechanical Engineering Department, École Polytechnique de Montréal, Montréal, CanadaSearch for more papers by this authorY. VERREMAN, Y. VERREMAN Mechanical Engineering Department, École Polytechnique de Montréal, Montréal, CanadaSearch for more papers by this authorL. DUBOURG, L. DUBOURG Aerospace Manufacturing Technology Center, Aerospace Research Institute, National Research Council, Montréal, CanadaSearch for more papers by this authorP. WANJARA, P. WANJARA Aerospace Manufacturing Technology Center, Aerospace Research Institute, National Research Council, Montréal, CanadaSearch for more papers by this author First published: 31 May 2011 https://doi.org/10.1111/j.1460-2695.2011.01580.xCitations: 26 F. Gemme. Email: [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat ABSTRACT The effects of advancing speed and rotational speed on the microstructure and the mechanical properties of friction stir welded 7075-T6 aluminium alloy sheets were studied. The fatigue strength of sound joints was measured and compared to tensile testing results. Macrographs and microhardness maps were carried out to reveal the microstructure transformations. Fractographic observations were made to identify the failure mechanisms. The effects of welding parameters on the fatigue strength are discussed in terms of welding pitch k (mm/rev) and heat input (J/mm). At a high welding pitch, crack initiation at the root of the circular grooves left by the tool on the weld surface is the most detrimental failure mechanism. As the size and the depth of the grooves are related to the welding pitch, the fatigue strength increases when the welding pitch is reduced. However, when the heat input is excessive, the failure is caused by sub-surface defects produced after abnormal stirring and/or by softening of the heat-affected zone. Lateral lips on the weld surface edges also have an effect on the fatigue strength for intermediate welding pitch values. REFERENCES 1 Arbegast, W. J. (2007) Application of friction stir welding and related technologies. In: Friction Stir Welding and Processing (Edited by R.S. Mishra & M.W. 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