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Effect of cooling media on residual stresses induced by a solid-state welding: underwater FSW

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Abstract

In this article, the effect of cooling media on the residual stresses (RS) induced by a solid-state welding process is scrutinized through measuring and comparing RS caused by friction stir welding (FSW) underwater and in open air using the non-destructive ultrasonic method for aluminum AA7075-T6. Underwater FSW as a solid-state welding method can extend the application of solid-state welding techniques in marine industry. Results reveal that the longitudinal and transverse RS reduce under the water compared to open air. This reduction in the longitudinal RS is the maximum within the nugget zone (about 17 %). Meanwhile, such reduction for the transverse RS reaches 70 % within the heat-affected zone. In addition, under both air and water, the longitudinal RS is several times greater than the transverse RS and is in tensile and compressive states inside and outside the nugget zone, respectively.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, Hangam Street, Tehran, Iran

    Hossein Papahn, Pouya Bahemmat & Mohammad Haghpanahi

  2. Joining and Welding Department ASA Engineering Group (Engineering Company of Asr Sanat Ala), Tehran, Iran

    Pouya Bahemmat

Authors
  1. Hossein Papahn
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  2. Pouya Bahemmat
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  3. Mohammad Haghpanahi
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Correspondence to Pouya Bahemmat.

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Papahn, H., Bahemmat, P. & Haghpanahi, M. Effect of cooling media on residual stresses induced by a solid-state welding: underwater FSW. Int J Adv Manuf Technol 83, 1003–1012 (2016). https://doi.org/10.1007/s00170-015-7653-6

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  • DOI: https://doi.org/10.1007/s00170-015-7653-6

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