Stress-relief annealing (SR treatment) is often applied to relieve welding residual stresses in the fabrication process of pressure vessels, etc. This study aims at development of an efficient method as simple as hand calculation to estimate reduction of residual stresses of a very thick welded joint by SR treatment. In the first report, an estimating method was developed for relaxation tests, in uniaxial stress state, at changing and constant temperatures because the stress relaxation phenomenon is considerably similar to that observed in the SR treatment of a joint. In the second report, the stresses relaxed by SR treatment in a very thick welded joint were analyzed accurately by the finite element method based on thermal elastic-plastic creep theory. The characteristics of the changes of the welding residual stresses in multiaxial stress state were studied in detail for further development of the estimating method to SR treatment of a very thick welded joint, of which the stress state and boundary condition are very complex. In this report, the estimating equations in multiaxial stress states are developed for the stress relaxation phenomenon in the thick welded joints, based on the foregoing characteristics.
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February 2002
Technical Papers
A Simple Estimating Method for Reduction of Welding Residual Stresses in Thick Welded Joint From Stress-Relief Annealing—Part III: Development of Estimating Equations for Multiaxial Stress State in Thick Welded Joint
Keiji Nakacho, Associate Professor,
Keiji Nakacho, Associate Professor,
Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka 567-0047, Japan
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Keiji Nakacho, Associate Professor,
Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka 567-0047, Japan
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division, August 18, 1999; revised manuscript received June 13, 2001. Associate Editor: R. C. Gwaltney.
J. Pressure Vessel Technol. Feb 2002, 124(1): 14-21 (8 pages)
Published Online: June 13, 2001
Article history
Received:
August 18, 1999
Revised:
June 13, 2001
Citation
Nakacho, K. (June 13, 2001). "A Simple Estimating Method for Reduction of Welding Residual Stresses in Thick Welded Joint From Stress-Relief Annealing—Part III: Development of Estimating Equations for Multiaxial Stress State in Thick Welded Joint ." ASME. J. Pressure Vessel Technol. February 2002; 124(1): 14–21. https://doi.org/10.1115/1.1398080
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