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70 years of the Department of Metal Technology and Aviation Materials Science Samara National Research University named after S.P. Korolev
ArticleName Reasons for formation of transverse cracks in longitudinal weld of a pipe of the main gas pipeline
DOI 10.17580/chm.2022.09.05
ArticleAuthor D. V. Zhukov, A. A. Melnikov, S. V. Konovalov, M. O. Dmitrieva

Gazprom Transgaz Samara, Samara, Russia:

D. V. Zhukov, Head of the Database Maintenance Group


Samara National Research University named after Academician S. P. Korolev, Samara, Russia:
A. A. Melnikov, Cand. Eng., Associate Professor, Dept. of Metal Technology and Aviation Materials Science


Samara National Research University named after Academician S. P. Korolev, Samara, Russia1 ; Siberian State Industrial University, Novokuznetsk, Russia2:
S. V. Konovalov, Dr. Eng., Prof., Chief Researcher, ONIL-4 Laboratory1, Vice-Rector for Research and Innovation2, e-mail:


Research and Development Manufacturing Enterprise “Valma”, Samara, Russia:
M. O. Dmitrieva, Engineer


Investigations of transverse cracks in a longitudinal weld of a main gas pipeline pipe are presented, and the reasons for the formation of defects are analyzed. A comparative analysis of the results of in-line diagnostics and additional non-destructive testing with the actual parameters of cracks in microsections was carried out. The microhardness of the weld metal was measured in the crack zone and at a distance of up to 20 mm from it in both directions, which showed the presence of residual stresses in the region of the crack tip. The methods of optical and electron scanning microscopy were used to study the crack zone with the determination of the chemical composition of the weld base metal and inclusions in the crack zone. The results obtained made it possible to classify defects as “cold cracks” that formed in the weld metal after a long period of operation and developed further according to the stress corrosion cracking mechanism.

keywords Transverse crack, cold crack, weld, microstructure, residual stresses, periodic diagnostics, main gas pipeline

1. «Gazprom in Numbers» Handbook. Available at: (accessed: 25.03.2022).
2. Kharionovskiy V. V. Reliability of main gas pipelines: formation, development and current state. Gazovaya promyshlennost. 2019. No. 1. pp. 56–68.
3. Savin D. V., Zhukov D. V., Komarov D. V., Kholodkov S. А., Vinogradov I. S. Analysis of causes of destruction of elements of the piping valve units of pipelines using numerical simulation. Territoriya «NEFTEGAZ». 2021. No. 7–8. pp. 90–96.
4. Witek M. Validation of in-line inspection data quality and impact on steel pipeline diagnostic intervals. Journal of Natural Gas Science and Engineering. 2018. Vol. 56. pp. 121–133.
5. Shcherbo I. V., Kholodkov S. A., Belkov D. N., Komarov D. V., Zhukov D. V. Improvement of data reliability for internal pipe diagnostics in linear parts of main pipelines. Territoriya «NEFTEGAZ». 2020. No. 3–4. pp. 60–69.
6. Krampit А. G., Krampit N. Yu. Ways to control the weld formation. Tekhnologii i materialy. 2015. No. 3. pp. 21–26.
7. Ilyasova А. Kh. Technology of modern welding of pipeline parts. Ekspozitsiya Neft Gaz. 2012. No. 3. pp. 26–29.
8. Wen C., Deng X., Tian Y., Wang Z., Misra R. D. K. Microstructural evolution and toughness of the various HAZs in 1300-MPa-grade ultrahigh-strength structural steel. Journal of Materials Engineering and Performance. 2019. Vol. 28. pp. 1301–1311.
9. Rybakov А. А., Semenov S. Е., Filipchuk Т. N. Properties of the weld metal of double-sided welded joints of pipes made of high-strength microalloyed steel. Avtomaticheskaya svarka. 2013. No. 5. pp. 40–45.
10. Pryakhin Е. I., Sharapova D. М. Simulation modeling of the heat-affected zone structure of welded joints from low-alloy steels. Zapiski Gornogo instituta. 2014. No. 209. pp. 239–243.
11. Kruglova А. А., Orlov V. V., Sharapova D. М. Modeling of thermal effects on the heat-affected zone of K70 high-strength pipe steel during two-pass submerged arc welding. Metallurg. 2014. No. 9. pp. 98–104.
12. Deliou A., Bouchouicha B. Fatigue crack propagation in welded joints in X70. Frattura ed Integrita Strutturale. 2018. No. 46. pp. 306–318.
13. Chuchkalov М. V., Yusupov R. Kh., Askarov G. R., Bakhtizin R. N., Kitaev S. V., Askarov R. М. Analysis of defectiveness of welded joints of main gas pipelines. Gazovaya promyshlennost. 2017. No. 4. pp. 84–88.
14. Zakharov М. N., Nasonov V. А., Morozov Е. М. Fracture criterion for welded butt joints with internal defects. Izvestiya vysshikh uchebnykh zavedeniy. Mashinostroenie. 2014. No. 7. pp. 76–82.
15. GOST R ISO 6520-1–2012. Welding and allied processes. Classification of geometric imperfections in metallic materials. Part 1: Fusion Welding. Introduced: 01.01.2014.
16. GOST 2246–70. Welding steel wire. Specifications. Introduced: 01.01.1973.
17. Zhukov D., Konovalov S., Afanasyev A. Morphology and development dynamics of rolled steel products manufacturing defects during long-term operation in main gas pipelines. Engineering Failure Analysis. 2020. Vol. 109. A. 104359.

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