The Paton Welding Journal, 2007, №08

2007 №08 (08)

2007 №08 (02)

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The Paton Welding Journal, 2007, #8, 2-7 pages

Numerical study of risk of lamellar cracks formation in welding of shells of manholes into body of 75,000 m3 reservoir

O.V. Makhnenko, E.A. Velikoivanenko, N.I. Pivtorak

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
The characteristic case of computational estimation of the risk of lamellar cracks formation is considered in welding of shells of manholes into body of 75,000 m3 reservoir (town of Brody). On the basis of the analysis of stressed state in the zone of welded joints of oval manholes and resistibility of the material of branch pipe from steel 09G2S to formation and propagation of lamellar cracks, it was found that probability of occurrence in the branch pipes of through lamellar crack type defects is very insignificant. Revealed at hydrostatic tests of the reservoir leakiness of welded joints is due to poor design and the technology applied in performing the welded assembly.
Keywords: welded structures, girth welds, lamellar-type ruptures, lamellar cracks, hot straightening, numerical study, calculation

References

1. Bernatsky, A.V. (2000) Influence of anisotropy of the rolled stock mechanical properties on initiation and development of tough and lamellar-tough fractures. The Paton Welding ]., 7, 31–37.
2. Hrivnyak, I. (1984) Weldability of steels. Ed. by E.L. Makarov. Moscow: Mashinostroenie.
3. (1988) Fracture mechanics and strength of materials. Ed. by V. V. Panasyuk. Vol. 2: Stress intensity factors in bodies with cracks. Kiev: Naukova Dumka.

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Suggested Citation

O.V. Makhnenko, E.A. Velikoivanenko, N.I. Pivtorak (2007) Numerical study of risk of lamellar cracks formation in welding of shells of manholes into body of 75,000 m³ reservoir 2. The Paton Welding J., 08, 2-7.

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