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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�07 2020)
to russian

SCIENTIFIC-TECHNICAL SECTION

Sitnikov B. V., Marshuba V. P. � The influence of the welding circuit magnetic field on the formation of the joint at unsupported welding

The influence researches results of the welding circuit magnetic field on the seam formation at welding steel 12X18H10T by weight with a non-consumable electrode in argon are presented. The possibility of retaining the molten metal of the weld pool by the magnetic field of the current flowing along a rectilinear conductor located in the plane of the welded joint above the tail of the weld pool is shown. It is established that the efficiency of holding the molten metal of the weld pool is largely determined by the location of the current lead, the speed and rigidity of the welding mode.
Key words: welding on weight, nonconsumable electrode, argon, root of the seam, burns, magnetic field, arc, welding speed, undercutings

Anakhov S. V., Pykin Yu. A., Matushkin A. V. � New principles of gas-vortex stabilization in the technology of air-plasma cutting of metals

Application of new principles of gas-vortex stabilization allows to increase efficiency and quality of air-plasma cutting of metals. The use of symmetrical supply of plasma-forming gas to the gas-vortex system, the use of two expansion chambers and swirlers with a step distribution of gas through the channels of the gas-air path and tangential gas supply to the nozzle makes it possible to increase the uniformity of the gas flow distribution over the section of the plasma torch nozzle, improve the kinematic and energy parameters of the plasma arc (jet) for single-flow plasmatrons of the PMVR-5 series. Additional compression of the plasma flow due to the secondary gas flow in the PMVR-9 series plasma torches ("narrow-jet plasma" technology) makes it possible to further increase the uniformity and kinematic characteristics of the plasma flow at a small distance from the plasma torch nozzle. The developed plasma torches can significantly improve the performance and energy efficiency of cutting technology, as well as improve the quality of cutting seams. When cutting with new plasmatrons of structural steels of medium thickness, subsequent welding can be performed without additional machining of the cutting seams.
Key words: plasmatron, designing, gas swirl stabilization, a welded seam, quality, efficiency, acoustic safety, finishing cutting

Olshanskaya T. V., Fedoseeva E. M. � The predicting methods development of the welded joint microstructure as applied to temperature-time regimes of electron beam welding

The research is devoted to the prediction methods development of a welded joint microstructure applied to the temperature-time regimes of electron beam welding (EBW).
An analysis of models and modeling methods for the kinetics of the decomposition of austenite during cooling, existing in the practice of heat treatment, was carried out for prediction method selection of the molding microstructure in a welded joint during EBW. One of the methods for predicting the microstructure of welded joints during EBW based on these models is offered in this article.
Key words: electron beam welding, welded joint, welded joint microstructure, weld quality, heat treatment

Grigoryants A. G., Micyurov A. I., Shiganov I. N., Perestoronin A. V. � The laser welded joints properties of cryogenic austenitic nitrogen-containing steel

Formation, structure and properties of welded joints in cryogenic austenitic nitrogencontaining steel of chromium�nickel�manganese�nitrogen alloying system with reduced nickel content are investigated.
Under optimal laser welding conditions, a weld of small width with almost parallel walls is formed. This helps to reduce residual stresses and strains. There is a significant reduction in the structure size parameters of the weld compared to arc welding.
The mechanical properties of laser welds are within acceptable limits, so the tensile strength is 0.84�0.96 of the base metal. Fractographic analysis of the fracture surface of welded samples after testing showed the presence of developed zones of plastic deformation, which characterizes the laser welded joint as highly plastic.
Key words: laser welding, austenitic steel, nitrogen-containing steel, structure, property

PRODUCTION SECTION

Burlakov V. I., Kuznetsov K. A., Bykov S. P., Vasilev �. �., Bondarenko A. I., Dorokhov Yu. A. � The performance restoring technology of the carbamate condenser case for the first stage of distillation

The article adduces an example of a non-standard technological solution for repairing a multi-layer apparatus, in which during a scheduled shutdown, cracks are found on the body ferrule and at the place of welding of the DN 200 fitting made from austenitic high-alloy steel X2CrNiMo1812 with the apparatus body made from low-alloy steel BH54M. Within the framework of the developed technological solution, the procedure for its implementation and the contents of the repair aimed at eliminating unacceptable damage are described. The presented engineering approach allows to restore the operability of technological equipment in the shortest possible time and at the lowest cost with a guarantee of its further safe operation within the residual resource.
Key words: crack on the body, austenitic high-alloy steel, multilayer apparatus, technology for repairing of the body ferrule and fitting

Livshits I. M., Vlasov I. I., Romanov I. P. � Test results of welding materials for welding and deposition of the nuclear power plants equipment

The results of additional tests on certain physic-mechanical properties of the weld metal and deposited metal both in the initial state (after welding and deposition) and after performing heat treatment according to certain conditions are presented. Recommendations on the use of electrode materials in the manufacture of equipment for nuclear power plants are given.
Key words: welding materials, weld metal, adjacent zone, mechanical properties of the welded joint, welding electrodes, welding fluxes

Skoblo T. S., Rybalko I. N., Sidashenko A. I., Tikhonov A. V. � The use of a clay as modifying additives in the restoration deposition of parts

The operational stability of reducing surfacing with coating with a T-620 carbide-containing electrode and the use of additional modification with bentonite clay, introduced into a liquid bath in the form of an electrode coating, was evaluated. Achieved an increase in hardness and wear resistance by 2 times compared to the starting material of the product and by 1.3 times � with hardening only by the electrode without additional modification.
Key words: bentonite clay, surfacing, modification, wear resistance, structure formation

Volkov S. S., Remizov A. L., Kobernik N. V. � Features of the heat generation process at ultrasonic welding of polycarbonate under independent pressure

A mechanism is proposed for the formation of a welded joint of ultrasonic welding of hard-to-weld polycarbonate under independent pressure, which consists in the formation of a layer localized by thickness of a layer of heated welded material in which ultrasonic vibrations are predominantly absorbed, which makes it possible to obtain durable welded joints without significant deformation due to the concentration of thermal energy in the weld zone.
Key words: ultrasonic welding, acoustic contact pressure, static welding pressure, weld strength, independent pressure, edge preparation

ECONOMIC AND PRODUCTION ORGANIZATION

Shemendyuk E. R., Ermakov A. S., Ionov K. S. � Integration of additive technologies in the production structure of the radar industry enterprise

The additive technologies features for growing a large nomenclature of the components with complex configuration that is a part of a radar systems design (RSD) are adduced.
Layer-by-layer growing was carried out due to the effect of the laser beam on the material. The use of additive technologies has reduced the manufacturing cost of the RSD � components by 38 %.
Key words: radar complex, metal melting, laser beam

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