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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�05 2020)
to russian

SCIENTIFIC-TECHNICAL SECTION

Bushma V. �. � Uphill arc welding with a fixed consumable electrode

The physical phenomena occurring in the electrode during arc welding by a stationary consumable electrode using an uphill welding methodic are considered. Analytical solutions are obtained for the potential and projections of the current density for the lamellar electrode are obtained for the selected boundary conditions.
Key words: arc welding with a fixed consumable electrode, mathematical modeling, uphill welding methodic, horizontal welding scheme, electrode potential, lamellar electrode current density

Grigoryants �. �., Shiganov I. N., Perestoronin A. V., Misyurov A. I., Taksants M. V., Asyutin R. D., Usov S. V. � Kinetics of the WC particles motion in liquid steel during laser surface modification

Laser surface modification of steel with WC particles provides significant wear-resistance increasing. At the same time, it is important to achieve a uniform distribution of reinforcing particles over the depth of the created composite layer. To find out the possibility of the particles of different sizes application and to determine of the allowable ranges of parameters of the coaxial to the laser beam powder injection the calculations of the kinetics of penetration of WC particles into the molten surface of a sample made of carbon steel were carried out. It was shown that WC spherical particles with a diameter of about 50 to 150 microns, which are the most suitable for this application, could be injected to the entire depth of the molten part of the steel matrix if their speed of movement from the nozzle edge is from 6 m/s. All of them must reach the boundaries of the molten pool, and its shape determines their distribution throughout the depth. This provides the possibility to achieve the uniform hardening throughout the depth by varying the parameters of laser radiation.
Key words: laser surface modification, locomotive wheel, tungsten monocarbide, weldpool shape

Misyurov �. I., Shiganov I. N., Smirnova N. A., Taskants M. V. � Structure formation during laser welding of steel 30HGSA combined heat sources

The calculation and experimental method shows that laser welding of 30xgsa steel by combined heat sources can regulate the phase composition of different parts of the welded joint. When using an additional heat source, it is possible to obtain a range of structures from a little plastic quenching, with a martensite component of about 96 %, to a tempered bainite-troostite, relatively plastic, with a troostite content of up to 13 %.
Along with this, self-discharge of martensite occurs in the welded joint. The detected changes in the structure should lead to an increase in the plastic properties of the welded joint, as well as a decrease in the probability of cold cracks.
Key words: laser welding, additional heat source, regulation, phase composition, properties

Bachurina D. M., Suchkov A. N., Gurova Yu. A., Sevryukov O. N. � Hightemperature brazing of structural elements for the first wall of the DEMO reactor with rapidly hardened tungsten and steel alloys-solders

The work presents the results of high temperature brazing of reduced activated ferritic martensitic steel EK-181 with pure tungsten, which is essential for DEMO fusion reactor.
To reduce thermal stresses vanadium interlayer was used. Brazing alloys to be used were rapidly quenched into ribbons Cu-28Ti and Cu-28Sn for EK-181/V, Cu-50Ti for V/W. Microstructure investigations, mechanical and thermocycling test were carried out. It is shown that Cu-28Ti is better to use, however it is necessary to improve reliability of V/W seam.
Key words: high-temperature brazing, quick hardened alloy-solder, thermonuclear energetics, brazing mode, coefficient of thermal expansion

PRODUCTION SECTION

Makarov G. I., Kapustin �. �. � Modern scientific trends of the various welding methods application at the construction and repair of pipelines

The article discusses the modern scientific trends in the application of the pipelines construction and repairs various welding methods. The characteristic is given to the new generation main pipelines and the pipes types used. It�s shown how the increased pipes products requirements are influencingfor welding technology at the main oil pipelines construction and repair. Scientific and practical tasks on improving methods for assessing themain oil pipelines technical conditions and repairs technologies are formulated.
Key words: main pipelines, new generation pipes, pipes automatic welding, pipelines repair welding, factory-made repair structures

Sviridov A. V., Gribkov M. S., Khammatov R. R. � Electron-beam welding of ring parts with variable cross section

The technology is developed and the modes of electron beam bonding of large-size ring structurally similar sample of variable section from Ti-6Al-4V titanium alloy are picked up. The complex of metallographic, fractographic researches of the samples which are cut out from different sections of variable section of welded preparation is conducted.
Tests by definition of mechanical characteristics of weld joints showed that the level of durability of the weld joints executed by EBW was more than 1 from durability of base metal. The analysis of residual stresses showed that carrying out the subsequent vacuum annealing reduces the level of residual stresses in weld joints more than by 50 %.
Key words: titanium alloy, electron beam welding, welding parameters, mechanical properties

Dorokhov A. S., Aulov V. F., Lyalyakin V. P., Ishkov A. V., Ivanayskiy V. V., Krivochurov N. T. � Improving of the coating wear resistance obtained by high-frequency boronizing by modification with intermetallic compounds systems Fe-Al and Ni-Al

The wear-resistant composite coatings FeB-(Fe-B)-MexAly, where Me is Fe, Ni, are received at performing high-frequency boron impregnation of structural steel 65G under a charge layer based on fused borate flux P-0.66, boron carbide and intermetallic compounds FexAly, NixAly, where x, y = 1, 2, 3, 5 formed in Fe-Al and Ni-Al systems via selfpropagating high-temperature synthesis (SHS), are received. The coating thickness reaches 500...800 μm, the deposition time is 1�2 minutes. Using the methods of x-ray phase analysis, spectral analysis and metallography, the composition and structure of the coatings are determined. The hardness of the coatings by the standard method is determined. The microhardness distribution over the thickness of the coatings is studied.
In the coatings, new phases of intermetallic compounds and double superhard boride Fe2AlB2 are discovered. FeB is present in the coatings as the main iron boride, which leads to an increase in their hardness and wear resistance. Modification of the resulting boride coatings with intermetallic compounds with melting temperatures close to the technological temperature of the high-frequency deposition leads to a decrease in the number of cracks and the emergence of new consumer qualities of the material.
Key words: high-frequency heating, high-speed high-frequency boron impregnation, boron carbide, iron-boride eutectic, intermetallic compounds

ECONOMIC AND PRODUCTION ORGANIZATION

Lutsenko �. V., Tarasov �. V., Chkalov S. V. � Methodology of innovative design of high technology products

The article deals with the actual problem of the production of radar stations using the methodology of innovative design and the theory of design.
Key words: Innovative design, design theory, innovation process

INFORMATION

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