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A study of the parameters influencing mechanical properties and the fatigue performance of refill friction stir spot welded AlMgSc alloy

  • Sara Beatriz Miranda Lage
  • Leonardo Contri CampanelliEmail author
  • Ana Paula de Bribean Guerra
  • Junjun Shen
  • Jorge Fernandez dos Santos
  • Paulo Sergio Carvalho Pereira da Silva
  • Claudemiro Bolfarini
ORIGINAL ARTICLE
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Abstract

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.

Keywords

Refill friction stir spot welding Design of experiments Aluminum Shear strength Fatigue 

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Notes

Acknowledgements

Authors acknowledge Mr. Manfred Horstmann and Mr. Hamdi Tek for their technical support in performing the fatigue tests.

Funding information

This study was financially supported by the Brazilian institutions CNPq and FAPESP (process n. 2016/12995-5).

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  • Sara Beatriz Miranda Lage
    • 1
  • Leonardo Contri Campanelli
    • 1
    Email author
  • Ana Paula de Bribean Guerra
    • 1
  • Junjun Shen
    • 2
  • Jorge Fernandez dos Santos
    • 2
  • Paulo Sergio Carvalho Pereira da Silva
    • 1
  • Claudemiro Bolfarini
    • 1
  1. 1.Department of Materials EngineeringFederal University of São CarlosSão CarlosBrazil
  2. 2.Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics, Solid State Joining ProcessesGeesthachtGermany

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