Post Welding Heat Treatment Simulation in Welded Stainless Steel Pipe and Comparison with Experiment

Abstract:

Due to the intense concentration of heat in the welding process, residual stresses are produced in the specimen. One of the most effective ways to relief welding stress is Post Welding Heat Treatment (PWHT). In this paper, finite element method is employed to model and analyze PWHT for two pass butt-welded SUS304 stainless steel pipe. In this simulation, firstly, the welding process has been modeled. Then the stress distribution of the specimen has been transferred to a second analysis for stress relaxation modeling. Norton law is used to investigate creep in stress relief process. Experimental tests are also carried out to verify the effectiveness of the proposed numerical models. The hole drilling method is used to measure the stress distribution in the specimen. The residual stress distribution data before and after PWHT are compared to investigate the effect of heat treatment on residual stress. Based on the modeling and experimental results, the tensile and compressive stresses distributions have been reduced. They are in a reasonable agreement with each other and prove the capability of the proposed modeling technique to simulate PWHT.

• Periodical: Advanced Materials Research (Volumes 83-86)
• Pages: 237-243
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.83-86.237
• Online since: December 2009
• Authors: Mohammad Sedighi, B. Davoodi
• Keywords: Finite Element Model (FEM), Heat Treatment, Hole-Drilling, Residual Stress, Welding

References

[1] D. Deng, H. Murakawa, Numerical simulation of temperature field and residual stress in multipass welds in stainless steel pipe and comparison with experimental measurements, Computational Materials Science, (2005).

DOI: 10.1016/j.commatsci.2005.07.007

[2] A. H. Yaghi, T. H. Hyde, A. A. Becker, J. A. Williams, W. Sun, Residual stress simulation in welded sections of P91 pipes, Journal of materials processing technology, (2005), 167, pp.480-487.

DOI: 10.1016/j.jmatprotec.2005.05.036

[3] F. Rick, G. Reinhart, G. Lenz, Advance finite element models for the simulation of laser welding, in: proceedings of the 17th International conference on the application of laser and electrooptics, USA, Orlando/Florida, (1998), pp.1-10.

DOI: 10.2351/1.5059165

[4] G. Donzella, S. Granzotto, G. Amici, A. Ghidimi, R. Bertelli, Microstructure and residual stress analysis of a rim chilled solid wheel for rail transportation system, Comput. Methods. Exper. Measure. Surf. Treatment effects 2, (1995), pp.293-300.

[5] M. Mochizuki, Sh. Matsushima, M. Toyoda, Z. Zhang, O. Gundersen, Ch. Thaulow, Generation behaviour of thermal and residual stresses due to phase transformation during welding heat cycles, ASME Pressure Vessels Piping Div. (Publication) PVP 434 (2002).

DOI: 10.1115/pvp2002-1115

[6] X. K. Zhu, Y. J. Chao, Effects of temperature-dependent material properties on welding Simulation, Comput. Struct. 80 (11) (2002) 967-976.

DOI: 10.1016/s0045-7949(02)00040-8

[7] P. Dong, The Mechanics of Residual Stress Distribution in Girth Weld, in Proceedings of the second International Conference on the Integrity of High Temperature Welds, London, UK, 10-12 November, (2003), pp.185-196.

[8] S. Nair, E. Pang, R. C. Dix, Residual stress generation and relaxation in butt-welded pipes, Journal of pressure vessel technology, (1982), Vol 104.

DOI: 10.1115/1.3264202

[9] A. Lundback, Finite element modeling and Simulation of welding of aerospace component, Licentiate Thesis, Division of computer aided design, Department of applied physics and mechanical engineering, Lulea University of technology, (2003).

[10] A. Thuvander, Calculation of distortion of tool steel dies during hardening, in: Proceedings of the second International conference on quenching and control of distortion, USA, Cleveland/Ohio, 1996, pp.297-304.

[11] B. L. Josefsson, Residual stresses and their redistribution during annealing of a girth-butt welded thin walled pipe, Pressure vessel Technol. 104, (1982), pp.245-250.

DOI: 10.1115/1.3264212

[12] J.R. Cho, B.Y. Lee, Y.H. Moon, C.J. Van Tyne, Investigation of residual stress and post weld heat treatment of multi pass weld by finite element method and experiments, Journal of materials processing Technology, (2004).

DOI: 10.1016/j.jmatprotec.2004.04.325

[13] ASM Handbook Vol. 4, Heat Treating, (1991).

[14] J. Dabbagh, Creep analysis in welding, MS thesis, Iran University of Science & Technology, (2000).