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

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DOIResolve DOI: http://doi.org/10.1111/j.1460-2695.2011.01580.x
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TypeArticle
Journal titleFatigue & Fracture of Engineering Materials & Structures
Volume34
Issue11
Pages877886; # of pages: 10
Subject7075 aluminium alloy; fatigue; friction stir welding; heat input; process parameters; welding pitch
AbstractThe 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.
Publication date
LanguageEnglish
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedNo
NPARC number19726590
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Record identifier9dca3bd2-4e78-4af7-ba55-fa74c05b62ac
Record created2012-03-26
Record modified2016-05-09
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