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Surface Residual Stresses in Ti-6Al-4V Friction Stir Welds: Pre- and Post-Thermal Stress Relief

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Abstract

The purpose of this study was to determine the residual stresses present in titanium friction stir welds and if a post-weld thermal stress relief cycle would be effective in minimizing those weld-induced residual stresses. Surface residual stresses in titanium 6Al-4V alloy friction stir welds were measured in butt joint thicknesses ranging from 3 to 12 mm. The residual stress states were also evaluated after the welds were subjected to a post-weld thermal stress relief cycle of 760 °C for 45 min. High (300-400 MPa) tensile residual stresses were observed in the longitudinal direction prior to stress relief and compressive residual stresses were measured in the transverse direction. After stress relief, the residual stresses were decreased by an order of magnitude to negligible levels.

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Acknowledgment

The authors of this paper would like to thank The Boeing Company for the support and Dr. D. Sanders for his encouragement throughout this research project. Our sincere thanks are also extended to J. Bernath, of The Edison Welding Institute for providing the welded specimens and assistance with process development.

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  1. Department of Mechanical Engineering, University of Washington, Box 352600, Seattle, WA, 98195, USA

    P. Edwards & M. Ramulu

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  1. P. Edwards
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  2. M. Ramulu
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Correspondence to P. Edwards.

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Edwards, P., Ramulu, M. Surface Residual Stresses in Ti-6Al-4V Friction Stir Welds: Pre- and Post-Thermal Stress Relief. J. of Materi Eng and Perform 24, 3263–3270 (2015). https://doi.org/10.1007/s11665-015-1610-2

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  • DOI: https://doi.org/10.1007/s11665-015-1610-2

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