Effects of Repair Weld on Residual Stress Distributions in Offshore Pipelines

Abstract:

Subjects related to strength and durability of structures such as oil and gas transmission pipelines areof great importance. Considering the special characteristics of these structures including their construction and harsh working environment, they are especially prone to different types of damages. Repair welding is a viable optiontomitigatesuch damages and for restoration of the strength and resistance of these structures. In this paper, anumerical coupled thermo-mechanical finite element modelling approachis conducted tosimulatethewelding and the repair welding process. The results of the studyshow that repair weldsmay wellhave adverseeffects on the residual stress magnitudeand on its distribution. This might in turnpotentially put the integrity of the pipeline at risk.

• Periodical: Applied Mechanics and Materials (Volumes 249-250)
• Pages: 284-290
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.249-250.284
• Online since: December 2012
• Authors: M. Zeinoddini, S. Arnavaz, S.A. Hoseini
• Keywords: Finite Element Analysis (FEA), Offshore Pipeline, Repair Welding, Residual Stress

References

[1] Zeinoddini, M. 2012, In-Situ Quasi-Static and Dynamic Behavioral Response of Steel Tubular Frames Subjected to Lateral Impact Loads, Latin American Journal of Solids and Structures, Vol. 9: 383 – 400.

DOI: 10.1590/s1679-78252012000300005

[2] Zeinoddini, M., 2011, Design of Offshore Oil/Gas Platforms against Ship Impacts: Dynamic and Quasi-Static Behavior of Steel Tubular, LAP Lambert Academic Publishing, Saarbrücken Germany, ISBN-13: 978-3845422701.

[3] Zeinoddini, M. and Parke, G.A.R., 2011, Dynamic Shakedown and Degradation of Elastic Reactions in Laterally Impacted Steel Tubes, International Journal of Damage Mechanics, Vol. 20 No. 3 pp: 400-422.

DOI: 10.1177/1056789509359675

[4] Leggatt R.H., Residual Stresses in Welded Structures, International Journal of Pressure Vessels and Piping 85, 2008, p.144–151.

DOI: 10.1016/j.ijpvp.2007.10.004

[5] Vega O. E, J.M. Hallen, A. Villagomez, A. Contreras. Effect of Multiple Repairs in Girth Welds of Pipelines on the Mechanical Properties, Materials Characterization, 2008, 1498 – 1507.

DOI: 10.1016/j.matchar.2008.01.011

[6] Goldak, J., Chakravarti, A., and Bibby, M., A new finite element model for welding heat sources, Metall. Trans. B. 15B, 1984, p.299–305.

DOI: 10.1007/bf02667333

[7] Nguyen, N. T., Ohta, A., Matsuoka, K., Suzuki, N., and Maeda, Y., 'Analytical Solutions for Transient Temperature of Semi-Infinite Body Subjected to 3-D Moving Heat Sources, ', Weld. J., Aug. 1999, p.265–274.

[8] Dong, P., 'Residual Stress Analyses Multi-Pass Birth Weld: 3-D Special Shell versus Axisymmetric Models, ', ASME J. Pressure Vessel Technol., 123, May2001, p.207–213.

DOI: 10.1115/1.1359527

[9] Fanous, I.F.Z., Younan, M.Y.A., Wifi, A.S., 3-D Finite Element Modeling of the Welding Process Using Element Birth and Element Movement Techniques, ASME Pressure Vessels and Piping Conf., Vancouver, BC, Canada, 2002, pp.165-172.

DOI: 10.1115/pvp2002-1323

[10] Fanous, I. F. Z., '3D Modeling of the Welding Process Using Finite Elements, ', M. Sc. thesis, The American University in Cairo, February (2002).