UDC 681.5.015 DOI: 10.34641/SP.2024.1064.1.001 Petrov S. Yu., Orlov S. E. — Determination of the amount of energy released at the rail ends during flash-butt welding based on solving the inverse heat conduction problem
As a result of the conducted numerical studies of the kinematics of temperature fields during rail welding, two finite element problems were solved to determine the energy used for the formation of a welded joint at the initial stage of end flashing: 1) the direct heat conduction problem for uniform heating of the rail end; 2) the inverse heat conduction problem with a bevel at the rail end. The regularities of energy release during uniform and non-uniform (presence of a bevel) heating of the rail end are established. Keywords: identification, current lines, bevel, finite element method, flash-butt welding, direct and inverse heat conduction problems, rail, thermal imager, thermal cycle, end, energy
SCIENTIFIC AND TECHNICAL SECTION
UDC 621.791 DOI: 10.34641/SP.2024.1064.1.002 Semenov V. N., Rizakhanov R. N., Koshlakov V. V. — High-temperature brazing of multiphase structures
The physical and chemical processes accompanying the formation of a high-temperature brazed joint based on copper-silver solder, when the surfaces to be brazed are multiphase structures (heat-resistant steel, precipitation-hardening alloy, etc.), are investigated. The analysis of the processes occurring during the interaction of the copper-silver melt and the brazed surface and leading to joint failure is carried out. Keywords: high-temperature brazing, copper-silver solder, barrier coating, multiphase structure, precipitation-hardening alloy, heat-resistant steel, crack, failure, strength
UDC 621.791.923 DOI: 10.34641/SP.2024.1064.1.003 Kovtunov A. I., Isakov Yu. A., Vershinin L. V. — Structure and properties of deposited titanium cuprides
The technology of argon arc surfacing of alloys based on titanium cuprides using an electrode wire based on aluminum bronze is proposed. Keywords: intermetallic alloys, titanium cuprides, arc surfacing, chemical composition, phase composition, electrode wire, hardness, wear resistance, deposited bead
UDC 812.35.03.13 DOI: 10.34641/SP.2024.1064.1.004 Matyunin V. M., Marchenkov A. Yu., Tsvetkova N. O., Sviridov G. B., Pankina A. A., Zhgut D. A. — Operational control of residual stresses in welded joints
On a welded joint obtained by electron beam welding, the method for determining residual stresses by instrumental indentation, regulated by GOST R 57172-2016, is tested. Practical recommendations are given for the application of the considered method for welded joints with control of residual stresses at various points of the weld cross-section at different distances from the surface. Keywords: residual stresses, welded joints, instrumental indentation, electron beam welding, indentation diagram, hardness, low-alloy steel
UDC 812.35.19.17 DOI: 10.34641/TM.2023.247.1.003 Kryuchina O. A., Shiganov I. N., Sadovnikov I. E. — Features of the energy characteristics of the light technological medium during laser and laser-arc processing of metals with fiber lasers
The article presents the features of the energy characteristics of the light medium of laser and hybrid laser-arc technological welding. It is shown that during laser processing of various metallic materials, different spectra of the light medium arise — ultraviolet, infrared, and visible radiation. The measurement results showed that the parameters of ultraviolet and infrared radiation during laser welding of aluminum alloys are higher than during welding of steel specimens. In hybrid laser-arc welding, high values of ultraviolet and infrared radiation prevail, while laser irradiance is practically absent. The means of protection against laser and accompanying radiation that must be provided for in the processes under consideration are determined. Keywords: laser welding, hybrid laser-arc welding, energy characteristics, laser radiation, protective equipment
PRODUCTION SECTION
UDC 691:721.75 DOI: 10.34641/SP.2024.1064.1.005 Feofanov A. N., Ovchinnikov V. V., Smirnov S. V. — Automation of quality control of joints in resistance spot welding of needle fasteners made of titanium alloys
The features of joint formation between the needle and the plate of a needle bushing during resistance spot welding are investigated. A technological scheme for making the joint of the needle with the needle bushing plate is proposed, which ensures the formation of a cast zone between the needle and the plate metal. Keywords: needle bushing, resistance welding, needle, plate, titanium alloys, automation of joint quality control, welding current, pulse duration, pressing-out force
UDC 621.791.75; 621.314 DOI: 10.34641/SP.2024.1064.1.006 Zarechensky D. A., Gulakov S. V., Burlaka V. V., Fedosov A. V., Golovin A. Yu. — Analysis of welding properties and energy consumption of single-phase arc welding power sources
The results of comparative tests of single-phase welding current power sources — inverters and a transformer from different manufacturers — are presented, as a result of which differences in welding properties and energy consumption characteristics are established. The possibility and feasibility of increasing the power factor of inverter power sources are shown. Keywords: power source, inverter, transformer, welding properties, power factor
PRODUCT QUALITY MANAGEMENT, STANDARDIZATION. ORGANIZATION OF PRODUCTION
UDC 339.133.017, 339.133.2, 339.138, 621.791 Belov E. I. — Current state and problems of prospective development of the Russian welding industry
The article considers the current state of the Russian welding industry. The volumes of welding equipment production in Russia and the level of import dependence for various welding technologies are determined. A list of priority directions for the development and support of the welding industry is formed. Keywords: welding industry, state of welding equipment, development, prospects
INFORMATION
Invitation to the International Conference "Welding and Related Technologies for the Manufacture of Special and Critical Equipment"
Results of the X Anniversary International Industrial Forum "Territory NDT-2023. Non-Destructive Testing. Testing. Diagnostics"