FORECASTING OF THE MECHANICAL PROPERTIES OF METAL WELDED CONNECTIONS OF PIPELINES AND TANKS, TAKING INTO ACCOUNT THE TIME PARAMETER OF WELDING
Abstract
The article presents the results of experimental studies of the relationship between the welding reference
variables (chemical composition of welding materials, welded elements, welding conditions), the structure formed
in the welded joint, its basic mechanical properties (ductility, strength, impact toughness), and crack resistance
parameters. The research consisted in carrying out standard and special tests, as well as studying the structure of
the metal after heat treatment at various cooling rates. To confirm the established relationships, tests of
circumferential welded joints of pipes and sheets of tanks, welded according to the technologies used in the
Transneft PJSC, were carried out.
As a result, a model has been developed for predicting the mechanical properties of welded joints according
to data of various levels. It was elucidated the quantitative effect of the cooling rate and structure parameters on
the main mechanical properties of the welded joint. Also, empirical expressions were obtained connecting the
group of mechanical properties of the metal (the ratio of the yield strength to the tensile strength, relative
elongation, impact toughness), combined into a "complex coefficient of durability", and the metal crack resistance
parameters used in the force criterion of fracture mechanics.
The greatest practical effect from the implementation of the developed model is achieved with the
introduction of differentiated decreasing coefficients within the framework of computation for strength and
durability, depending on the level of data on the welded joint used in the calculations.
References
products and hydrocarbon raw materials. - 2019. - No. 2. - pp. 44-46.
2. Aladinsky, V.V. Formation of requirements for the geometry and properties of welded joints of pipes, ensuring the reliability of pipelines / V.V. Aladinsky, A.V. Melnikova // Science and technology in the gas industry. - 2009. - No. 4 (40). - pp. 43-48.
3. Golikov, N.I. Strength of welded joints of tanks and pipelines operating in the conditions of the North / N.I. Golikov, A.P. Ammosov. - Yakutsk: Publishing house of the North-Eastern Federal University, 2012. - 232 pages.
4. Makarov, E.L. Theory of weldability of steels and alloys / E.L. Makarov, B.F. Yakushin. - M .: Publishing house of the Moscow State Technical University named after N. E. Bauman, 2014, 487 pages.
5. Savkin, A.N. Methods for determining the coefficients of the equation for the growth rate of a crack under cyclic loading / A.N. Savkin, A.V. Andronik, R. Koraddi // Factory laboratory. Diagnostics of materials.- 2016.- Volume 82.- No. 1.- pp. 57-63.
6. Mamontov, V.A. Construction of a diagram of fatigue destruction of ship shaft models / V.A. Mamontov, T.A. Kuzhakhmetov, R.U. Iksanov, Doan Van Tin // Bulletin of ASTU.- 2008.- No. 5 (46) .- pp.44-49.
7. Stress Intensity Factors Handbook: In 2 volumes. Volume 1: Translated from English/ Eds. Yu. Murakami. - M .: Mir, 1990.- 448 pages.
8. Terentyev, V.F. Fatigue of metallic materials / V.F. Terentyev.– M.: Nauka, 2003.– 254 pages.
9. Zorin, A.E. Analysis of structural and thermal processes during welding (to optimize the technology of cutting out circular welded joints of pipelines) / A.E. Zorin // Oil, Gas and Business.- 2011.- No. 6.- pp. 67- 70.
10. Zorin, A.E. Development of coupon structure for conducting mechanical tests of metal pipes / A.E. Zorin // The territory of "NEFTEGAZ".- 2015.- No. 3.- pp. 124-128. Zorin, A.E. Scientific and methodological support of the system for maintaining the operability of longterm operated gas pipelines: dis. ... of DEng: 25.00.19 /
Zorin Alexander Evgenievich. - Moscow, 2016. - 332 pages.
11. Belchenko, G.I. Fundamentals of metallography and plastic deformation of steel / G.I. Belchenko, S.I. Gubenko. - Kiev: Vishcha shkola, 1987. - 240 pages.
12. Bidulya, P. Steel foundry practice, 1968.- 319 p.
13. Geller, Yu. Tool steels, 1978.- 659 p.
14. Ockerblom, N.O. Design of technology for the production of welded structures / N.O. Ockerblom, V.P. Demyantsevich, I.P. Baikova. - Leningrad: Sudprom GIZ, 1963. - 602 pages.
15. Welding in machine engineering: Handbook in 4 volumes / Eds. N.A. Olshansky.– M.: Mashinostroenie, 1978.- Vol. 1.- 504 pages.
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