The Paton Welding Journal, 2012, №12



2012 №12 (02)

2012 №12 (04)

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The Paton Welding Journal, 2012, #12, 15-17 pages  

RESIDUAL STRESSES IN CIRCUMFERENTIAL BUTT JOINTS IN THE MAIN GAS PIPELINE AT LONG-TERM SERVICE IN THE NORTH

N.I. Golikov and V.V. Dmitriev

V.P. Larionov Institute of Physico-Technical Problems of the North, SD RAS, Yakutsk, RF
 
 
Abstract
Fields of residual welding stresses in circumferential butt joints of the main pipeline of 530 mm diameter with 7 mm wall thickness after long-term service under the North conditions were experimentally studied. It is shown that a high level of tensile residual welding stresses is preserved in circumferential welded joints of the main gas pipeline after 40 years of service. In sites of corrugation formation the residual welding stresses may reach 87 % of base metal yield point. They should be taken into account at calculation of residual life of welded main pipelines.
 
 
Keywords: main welded gas pipelines, circumferential butt joints, HAZ, residual tensile welding stresses, corrugation, residual life
 
 
Received:                ??.??.??
Published:               28.12.12
 
 
References
 
1. Lyglaev, A.V., Levin, A.I., Kornev, I.A. et al. (2001) Operation of main pipelines under the North conditions. Gaz. Promyshlennost, 8, 37-39.
2. Vinokurov, V.A., Grigoriants, A.G. (1984) Theory of welding strains and stresses. Moscow: Mashinostroenie.
3. Makhnenko, V.I. (1976) Computational methods for investigation of kinetics of welding stresses and strains. Kiev: Naukova Dumka.
4. Ammosov, A.P., Golikov, N.I. (1999) Diagnostics of welded joints of above-ground main pipelines operating under the North conditions. Kontrol. Diagnostika, 9, 13-17.
5. Makhnenko, V.I., Velikoivanenko, E.A., Shekera, V.M. et al. (1998) Residual welding stresses in the zone of circumferential butt welded joints of austenitic steel pipelines. Avtomatich. Svarka, 11, 32-39.
6. Ignatieva, V.S., Kulakhmetiev, R.R., Larionov, V.V. (1985) Effect of residual stresses on fatigue crack propagation in welded butt joint zone. Ibid., 1, 1-4.
7. Larionov, V.P. (1986) Electric arc welding of structures of the Northern version. Novosibirsk: Nauka.

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