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Low-cycle fatigue of a friction stir welded 2219-T62 aluminum alloy at different welding parameters and cooling conditions

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Abstract

Strain-controlled low-cycle fatigue tests and microstructural evaluation were performed on a friction stir welded 2219-T62 aluminum alloy with varying welding parameters and cooling conditions. Cyclic hardening of friction stir welded joints was appreciably stronger than that of the base material. The cyclic stress amplitude increased, and plastic strain amplitude and fatigue lifetime slightly decreased with increasing welding speed from 60 to 200 mm/min but were only weakly dependent of the rotational rate between 300 and 1,000 rpm with air cooling. Friction stir welded joints with water cooling had higher stress amplitude and fatigue life than that with air cooling. Fatigue failure of the joint occurred in the HAZ where the soft zone was present, with crack initiation from the specimen surface or near-surface defect and crack propagation characterized by typical fatigue striations.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    W. F. Xu & J. H. Liu

  2. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON, M5B 2K3, Canada

    D. L. Chen

  3. China FSW Center, Beijing FSW Technology Limited Company, Beijing, 100024, People’s Republic of China

    G. H. Luan

Authors
  1. W. F. Xu
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  2. J. H. Liu
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  3. D. L. Chen
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  4. G. H. Luan
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Correspondence to W. F. Xu.

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Xu, W.F., Liu, J.H., Chen, D.L. et al. Low-cycle fatigue of a friction stir welded 2219-T62 aluminum alloy at different welding parameters and cooling conditions. Int J Adv Manuf Technol 74, 209–218 (2014). https://doi.org/10.1007/s00170-014-5988-z

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  • DOI: https://doi.org/10.1007/s00170-014-5988-z

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