Improving the Technology Used in Fabrication of Tube Bundles of Heat Exchangers Produced from 12Cr18Ni10Ti Steel by Means of Friction Welding

Yakhin, A. V.; Karetnikov, D. V.; Rizvanov, R. G.; Абуталипова, Е. М.; Гареев, А. Г.; Токарев, А. С.

doi:10.1007/s10556-019-00553-5

Cited by 19 publications

(3 citation statements)

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“…Although studies have been carried out with suitable welding materials for welding these surfacings, it has now been proven that only nickel-based consumables meet the physical and mechanical requirements. This article will provide a more detailed description of the composition of 9% nickel steel, nickelbased welding materials and welds for chemical composition, heat treatment, mechanical properties, physical properties, international specifications and project requirements for LNG tanks [1][2][3][4][5][6][7][8][9]. Some practical recommendations and examples of recent projects on welding of 9% nickel steel by arc welding and arc welding under flux will be presented.…”

Section: Introductionmentioning

confidence: 99%

Welding Technology for Liquefied Natural Gas Tanks

Zaripov

Yalchigulov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Liquefied natural gas (LNG) is of great importance in the energy segment of the economy. Natural gas, has a higher calorific value, better fuel efficiency and is more environmentally friendly, thereby gaining more importance compared to oil and coal. Not only does LNG offer greater flexibility in supply, it also has cost advantages for transportation starting from a distance of 2,000 km (at sea) and 4,000 km (on land) respectively. Consequently, the LNG market will grow in the coming decades compared to two other fossil sources - oil and coal. To use natural gas, it is necessary to create safe and economically profitable transportation routes from natural gas deposits to end users. One possibility is to transport gas in a liquefied state, at low temperatures. To ensure safe and reliable storage of liquefied gas at minus 163 ° C, good physical and mechanical properties of the base material and weld (corresponding tank system) are required. To meet these high requirements, appropriate welding methods and welding materials are selected. The paper presents an analysis of activities on the development of new welding materials and improvement of welding technologies for the construction of LNG tanks.

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Section: Introductionmentioning

confidence: 99%

Welding Technology for Liquefied Natural Gas Tanks

Zaripov

Yalchigulov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…A brief review of the literature. At the moment there are several perspective directions of modernization of technological process of welding of the tube-to-tube sheet joint [13][14][15][16][17]. One of them is rotary friction welding application which as it will be shown further, allows to leave from need of application of thermal operations.…”

Section: Introductionmentioning

confidence: 99%

“…One of them is rotary friction welding application which as it will be shown further, allows to leave from need of application of thermal operations. However, use of this type of welding requires constructive change of the tube-to-tube sheet joint [18,19].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Stress-Strain State of a Tube Sheet of the Heat Exchanger at Rotary Friction Welding Application

Токарев

Karetnikov

Rizvanov

et al. 2020

MSF

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The aim of the study described in this paper is to assess the effect of forces acting on the tube sheet during friction welding on the stress-strain state of the tube sheet.For this, we calculated the stresses and displacements arising in the tube sheet during friction welding. The calculations were carried out in the ANSYS (finite element analysis software package). To carry out the calculations, solid-state models of tube sheets with diameters of 400, 600, 800, 1000, 1200, 1400 mm and thicknesses of 30, 40, 50, 60, 70 mm were created. The diameter of the holes for the heat exchange tubes was chosen equal to 25 mm, the holes are placed on the vertices of an equilateral triangle with a step equal to 32 mm. Then, based on geometric models, grids of 8-node finite elements were created. The calculation model takes into account the symmetry of the geometric model and the character of loading relative to the YZ and XZ planes. The material used was steel with a Poisson's ratio of 0.3 and an elastic modulus of 2,11·105 MPa.As a result of the calculations, it was found that as a result of the action of force factors during friction welding, significant stresses and deformations arise in the tube sheet. The greatest values of deflection and stresses occur in the central sector of the tube sheet in the area of application of force. In this case, the zone of maximum stresses is significantly localized: they are concentrated around the central hole, and movements smoothly increase from the periphery to the center of the tube sheet.The value of this study is that it allowed to determine the need to use special equipment that increases the local stiffness of the tube sheet sector subjected to friction welding.

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