A study of the parameters influencing mechanical properties and the fatigue performance of refill friction stir spot welded AlMgSc alloy
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Friction spot welds of 1.6-mm-thick AlMgSc alloy were investigated in this work. A design of experiment method was used to evaluate the effect of process parameters on the shear static strength. The optimized condition of parameters was employed in the assessment of the fatigue behavior. The typical hook feature was minimized by restricting the tool penetration into only the upper sheet. As a consequence, shear strength was sensitive to the extension of the welded region rather than the hook morphology. The fatigue performance was affected by the multiple crack initiation sites that resulted from a complex stress state during the axial loading. Striations were observed in practically the entire crack propagation region, suggesting that unstable fatigue crack growth did not take place in this specific weld configuration.
KeywordsRefill friction stir spot welding Design of experiments Aluminum Shear strength Fatigue
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Authors acknowledge Mr. Manfred Horstmann and Mr. Hamdi Tek for their technical support in performing the fatigue tests.
This study was financially supported by the Brazilian institutions CNPq and FAPESP (process n. 2016/12995-5).
- 1.Aleris (2015) Aerospace Aluminum AA5028 AlMgSc – The Strong Lightweight. https://www.aleris.com/wp-content/uploads/2016/02/AL-2342_012-Aktualisierung-BR-AlMgSc-2015-06-03-WEB.pdf. Accessed 15 May 2018
- 2.Pacchione M, Telgkamp J (2006) Challenges of the metallic fuselage. In: 25Th International Congress of the Aeronautical Sciences (ICAS 2006)Google Scholar
- 6.Schilling C, dos Santos J (2004) Method and device for linking at least two adjoining work pieces by friction welding. US patent 6,722,556 B2Google Scholar
- 15.American Welding Society (2013) Specification for Resistance Welding for Aerospace Applications AWS D17.2/D17.2M, 2nd edn. American Welding Society, DoralGoogle Scholar
- 16.Matweb. http://www.matweb.com/search/DataSheet.aspx?MatGUID=c1de7c6e8a9d45efa06da745e07094a2&ckck=1. Accessed 5 April 2018