The Paton Welding Journal, 2004, №12

2004 №12 (04)

2004 №12 (06)

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The Paton Welding Journal, 2004, #12, 33-35 pages

Improvement of the structure and properties of welded joints in large-diameter oil and gas pipes

Yu.N. Saraev¹, V.P. Bezborodov¹, I.M. Poletika¹, A.V. Tyutev¹, I.V. Nikonova¹, N.V. Kirilova¹, S.P. Sevostianov²

¹Institute of Strength Physics and Materials Science of SD of RAS, Tomsk, Russia
²OJSC «Tyumentransgas», Yugorsk, Russia

Abstract
Effect of a pulsed welding process on the structure and mechanical properties of welded joints in large-diameter (1420 mm) pipes of manganese low-alloy steels, intended for manufacture of oil and gas pipelines, has been studied. It is shown that the pulse welding conditions make it possible to improve the homogeneity of the structure and reduce the grain size of metal of the weld and HAZ zones. Structural changes at a positive temperature (20 °C) lead to increase of 8-27 %, and at a negative temperature (-60 °C) to increase of 15 -24 % in ductility and impact toughness of the weldedjoint zones.
Keywords: pulsed welding, low-alloyed steels, welded Joints, electrodes, mechanical properties, structure, pipes, oil and gas pipelines, strength, ductility, impact toughness

References

1. Application of a pulsed mode of welding large-diameter pipes (1420 mm) of manganese steels of 10G2S.
2. Livshits, L.S., Khakimov, A.N. (1989) Metals science of welding and heat treatment of welded Joints. Moscow: Mashinostroenie.
3. Saraev, Yu.N. (1994) Pulsed technological processes of welding and surfacing Novosibirsk: Nauka.
4. Saraev, Yu.N., Makarova, L.I., Kirilova, N.V. et al. (2001) Ways of improvement of efficiency of construction, service and repair of oil and gas industrial equipment and main pipelines on the base of adaptive pufsed technofogies of wefding and hardfacing. Svarochn. Proizvodstvo, 5, 31–37.
5. Saraev, Yu.N., Poletika, I.M., Kozlov, A.V. et al. (2002) Influence of welding conditions on structure, hardness distribution and mechanical properties of steam pipeline welded joints. Ibid., 8, 3–8.
6. Goldshtejn, M.I., Grachyov, S.V., Veksler, Yu.G. (1985) Special steels. Moscow: Metallurgiya.

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Suggested Citation

Yu.N. Saraev, V.P. Bezborodov, I.M. Poletika, A.V. Tyutev, I.V. Nikonova, N.V. Kirilova, S.P. Sevostianov (2004) Improvement of the structure and properties of welded joints in large-diameter oil and gas pipes. The Paton Welding J., 12, 33-35.

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