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Accurate measurement of residual stresses of 2219-T87 aluminum alloy friction stir welding joints based on properties of joints

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Abstract

In order to avoid the deviation caused by calculating the residual stresses of welding joints with the release coefficients of the same parent metal, a new method has been proposed based on the properties of weld joints. Since the mechanical property of 2195-F Al alloy is close to that of 2219-T87 Al alloy Friction stir welding (FSW) joint, 2195-F Al alloy is selected as the substitute material of 2219-T87 Al alloy FSW joint in the calibration test. Release coefficients of 2195-F Al alloy and proper correction coefficient are used to calculate the residual stresses of 2219-T87 Al alloy FSW joints. Compared to the results calculated with release coefficients of its parent metal, it has been proved that the proposed correction method is more precise in residual stresses measurement of weld joints. The mathematical analysis and the results of verification tests have shown that this new method is reliable, and it will provide guidance in academic research and engineering application of the spherical indentation strain-gauge method.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300-072, China

    Yang Du, Huan Li, Lijun Yang & Chuanguang Luo

  2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, 300-072, China

    Yang Du, Huan Li & Lijun Yang

  3. Sichuan Institution of Aerospace Systems Engineering, Chengdu, 610-100, China

    Chuanguang Luo

Authors
  1. Yang Du
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  2. Huan Li
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  3. Lijun Yang
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  4. Chuanguang Luo
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Corresponding author

Correspondence to Lijun Yang.

Additional information

Recommended by Associate Editor Jin Weon Kim

Yang Du is a Ph.D. student in the Department of Materials Science and Engineering at Tianjin University, Tianjin, China, and she will get her Master and Ph.D degrees in 2019. She has received her B.S. degree from Lanzhou Technology University, Lanzhou, China in 2013. Her research areas include the mechanical properties and numerical simulation of aluminum alloy welding process.

Huan Li is currently a Professor in the Department of Materials Science and Engineering at Tianjin University, Tianjin, China. He has received his Ph.D. degree from Tianjin University in 1997. His main research areas are the arc physics, high efficiency welding and aluminum alloy welding.

Lijun Yang is currently a Professor in the Department of Materials Science and Engineering at Tianjin University, Tianjin, China. He has received his Ph.D. degree from Tianjin University in 2001. His research interests include the control technology and equipment of welding process, arc and laser plasma physics.

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Du, Y., Li, H., Yang, L. et al. Accurate measurement of residual stresses of 2219-T87 aluminum alloy friction stir welding joints based on properties of joints. J Mech Sci Technol 32, 139–147 (2018). https://doi.org/10.1007/s12206-017-1215-9

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  • DOI: https://doi.org/10.1007/s12206-017-1215-9

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