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Evaluation of Surface Residual Stresses in Friction Stir Welds Due to Laser and Shot Peening

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Abstract

The effects of laser, and shot peening on the residual stresses in friction stir welds (FSW) has been investigated. The surface residual stresses were measured at five different locations across the weld in order to produce an adequate residual stress profile. The residual stresses before and after sectioning the coupon from the welded plate were also measured, and the effect of coupon size on the residual stress relaxation was determined and characterized. Measurements indicate that residual stresses were not uniform along the welded plate, and large variation in stress magnitude could be exhibited at various locations along the FSW plate. Sectioning resulted in significant residual stress relaxation in the longitudinal direction attributed to the large change in dimensions in this direction. Overall, laser and shot peening resulted in a significant reduction in tensile residual stresses at the surface of the specimens.

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Authors and Affiliations

  1. Structures & Dynamics Branch, NASA-Johnson Space Center, Houston, TX, 77058, USA

    Omar Hatamleh

  2. Industrial Engineering Department, Texas Tech University, Lubbock, TX, 79409-3061, USA

    Iris V. Rivero

  3. Mechanical Engineering Department, University of South Carolina, Columbia, SC, 29208, USA

    Jed Lyons

Authors
  1. Omar Hatamleh
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  2. Iris V. Rivero
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  3. Jed Lyons
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Correspondence to Omar Hatamleh.

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Hatamleh, O., Rivero, I.V. & Lyons, J. Evaluation of Surface Residual Stresses in Friction Stir Welds Due to Laser and Shot Peening. J. of Materi Eng and Perform 16, 549–553 (2007). https://doi.org/10.1007/s11665-007-9091-6

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  • DOI: https://doi.org/10.1007/s11665-007-9091-6

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