Journal "Svarochnoe Proizvodstvo"ISSN 0491-6441
Contents (№03 2020)
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SCIENTIFIC-TECHNICAL SECTION

Kozyrev N. А., Kryukov R. Е., Mikhno А. R., Usoltsev А. А., Provodova А. А. — Development of welding fluxes by using barium — strontium modifier and silicomanganese slag

The principal possibility of using barium-strontium modifier as a refining and gasshielding additive for welding fluxes based on slag from silicomanganese production is shown. For research the following materials were used: modifier BSK-2 according to TU 1717-001-75073896—2005 of NPK Metalltekhnoprom. As a flux, silicomanganese slag produced by the West Siberian Electrometallurgical Plant is used. During research barium-strontium flux additive was used. This additive was prepared according to two versions: barium-strontium modifier mixed with liquid glass and dust of barium-strontium modifier with fraction less than 0.2 mm. Additives were mixed at a ratio of 2—10% to weight of slag from silicomanganese production. Conducted laboratory studies on the deposition of steel samples showed that metal refining occurs, and the concentration of sulfur and phosphorus decreases. It is shown that the use of a mixture of barium-strontium modifier with liquid glass as an additive is preferable to the usage of an additive in the form of dust.
It is established that the usage of not more than 8% barium-strontium additive is optimal from the point of view of metal contamination by non-metallic inclusions.
Key words: welding, fluxes, technology, deposition, barium-strontium carbonatite, samples, non-metallic inclusions

Razmyshlyaev А. D., Ageeva М. V. — Primary crystallization of metal during arc deposition with influence of the longitudinal magnetic field

It is shown that the usage of the controlling magnetic fields during hidden wire arc deposition allows to grinding the structural components of the metal, which leads to an increase in the yield strength of the metal. Traditional ideas about the metal crystallization process in a weld pool are based on the fact that it occurs in accordance with a diffusion mechanism. However, there are fairly well grounded modern ideas in the field of foundry and metallurgical production that liquid metals have a crystal-like cluster structure and crystallization is as a process of cluster attachment to a solid metal backing. The process of crystallization of weld metal is similar to the process of crystallization of ingots in metallurgical production. In this work we used an iron-based alloy containing not more than 0.08 % C and not less than 17 % Cr, which does not undergo polymorphic transformations during crystallization, that to ensure the formation of only the primary structure of the deposited metal.
It is established a significant refinement of the metal structural components deposited with the influence of a longitudinal magnetic field with a frequency of 6...24 Hz. It is shown that the grinding mechanism of columnar crystallites during deposition with the influence of a magnetic field is associated with the size of clusters in a liquid metal attached to a solid backing of a bath metal during crystallization.
Key words: arc deposition, longitudinal magnetic field, induction, crystallization

Eremin Е. N., Losev А. S., Borodikhin S. А., Ponomarev I. А. — The influence of a complex from boride-nitride-intermetallic compounds on the hardening of 30N8X6M3STU steel obtained by flux-cored wire deposition

The features of hardening of the steel of the Fe-C-8%Ni-6%Cr-3%Mo-1%Si-1%Ti-1%Al system with its alloying by a complex of boron nitride, titanium diboride and zirconium diboride obtained by surfacing with flux-cored wire were investigated. It is established that such alloying provides hardness of the deposited steel, reaching 61 HRC as a result of aging. In this case, the microhardness of the eutectic of such steel is in the range of 1323—1633 HV, and the microhardness of the hardening phases is in the range of 2466—3387 HV, which is higher than that of steel without borides, respectively, 2 and 3.8 times. It is shown that the mechanism of hardening of the steel of such a system when alloying by a complex of boron nitride, titanium diboride and zirconium diboride determine the compounds of three borides Cr0.6Mo0.4B2, Cr2AlB2, Cr3B4; four intermetallic compounds Fe2.5Cr2.5, NiTi, Fe5Si3, Mo3.08Cr0.92; three carbides SiC, Cr7C3, Fe5C2 and three nitrides Ti3N1.29, BN, TiZrN2, formed as a result of aging. The flux-cored wire, created on the basis of steel 30N8Kh6M3STYu, containing boride-nitride-intermetallic compounds, provides high values of the hardness of the deposited metal after aging, which allows us to recommend it for coating on the working surfaces of forging equipment.
Key words: surfacing, flux-cored wire, alloying, boride compounds, durometric properties, fine structure

Мarkov М. А., Krasikov А. V., Bykova А. D., Kuznetsov Yu. А., Kravchenko I. N., Perevislov S. N., Bogdanov I. A. — Technological features of the porous functional ceramic coatings formation on aluminum by the method of microarc oxidation in silicate electrolytes

In this work, the team of authors investigated the possibility of using porosity of ceramic coatings synthesized by the microarc oxidation of aluminum for the formation of cermet coatings. Experimentally proved that at electrochemical nickel plating of MAO coatings, it is possible to obtain cermet coatings. It shown that the nickel introduction into the ceramic matrix of the MAO coating obtained in a silicate-alkaline electrolyte eliminates the formation of through pores. The effect of current characteristics and the concentration of a silicate-alkaline electrolyte on the oil absorption of the formed ceramic coatings during microarc oxidation of aluminum experimentally were proved.
Key words: ceramic coatings, microarc oxidation, aluminum, oil absorption, nickel plating, alumina, porosity, electrochemistry, electrolyte, sodium silicate

PRODUCTION SECTION

Nikolenko S. V., Gordienko P. S., Konevtsov L. A., Dvornik M. I., Panin E. S. — The use of functional gradient materials in the electrospark alloying of carbon steels

The work is devoted to the study of the effect of discharge parameters in electrospark alloying of carbon steel with functionally graded electrode materials based on tungsten carbide with additions of chromium and vanadium carbide. Found that supplements of W-Co electrode materials 0,4Cr3C2 + 0,4VC and 0,4VC-0,4Cr3C2 + 0,4C significantly increase the total weight gain of the cathode and the coefficient of mass transfer at ESA of steel 35. The parameters of roughness of doped layers Ra, Rz, Rp, Rq, Tp are investigated: it is found that there is an increase in the parameters of roughness with a decrease in duty cycle, as well as with an increase in the number of pulses, the total weight gain of the cathode and the mass transfer coefficient.
Key words: electric spark alloying, gradient, electrode materials, tungsten carbide, nanopowder chromium carbide and vanadium inhibitor of grain growth, the products of erosion, the kinetics of the process ESA, roughness

Lukin М. А. — Butt resistance welding by flash-off a package of aluminum sheets with a steel rod

The technology of welding a package of aluminum sheets with a steel rod, used at the enterprises of the aluminum industry for the installation of electrolyzers, is shown.
The influence of the intermetallic layer, which inevitably arises in the welded joint, on the strength of the joint is studied. The features that the welder must take into account when developing optimal welding conditions for such products are shown. The technological parameters of the optimal flash butt welding by continuous flash welding are given for a packet of sheets of 14,000 mm2 and a steel bar with a cross section of 26,000 mm2 on an MSO-100.01 (K-607) machine.
Key words: flash butt welding, welding of aluminum with steel, intermetallic layer, sheet package

STANDARDIZATION, PRODUCTION QUALITY

Budkin Yu. V., Zhuravleva T. B., Kvasnitskiy V. N., Mistrov L. E., Zlydnev M. N., Morozov V. P. — The functional synthesis method of the machine-building complex organizations

The decomposition of the goal of synthesis of organizations of the machine-building complex (OMK) in the form of an interconnected system of tasks and functions was carried out. It is shown that the basis for the synthesis of OMK is a functional synthesis based on the external and intrasystem levels of synthesis. Based on the structuring of the disaggregation levels and the sequential distribution (assignment) of resource units, the construction of the OMK functions tree in the form of a hierarchical interconnected set of actions is justified. The methodological basis for the presentation of OMK's methods of action in the form of a functional dependence on a combination of external factors, internal operations, the structure of functions and characteristics is proposed. The formalization of the physical statement of the problem is given and the method of functional synthesis of OMK is justified in the form of a set of hierarchical structures of aspects, levels of disaggregation and stages of their appearance.
Key words: organization of a machine-building complex, design, functional synthesis, goal, task, function, performance indicator, appearance, aspect, level, stage

ECONOMIC AND PRODUCTION ORGANIZATION

Makarov G. I., Ivantsova S. G. — The policy strategy of the corrosion-resistant steels import substitution for welding isothermal tanks for liquefied natural gases

The article considers the import substitution issues of corrosion-resistant steels for liquefied natural gases double-walled isothermal tankswelding. It’s shown that the imported steel X7Ni9 and AISI 304 used at the internal tank welding can be replaced by the domestic corrosion-resistant (stainless) austenitic steels, cold-resistant at cryogenic temperatures up to minus 196 °C. It’s proposed to change the design of the liquefied natural gas double-walled isothermal tank, excluding the external reinforced concrete casing, and save only the outer metal shell.
Key words: welded structures, isothermal tanks, corrosion-resistant austenitic steels, fracture toughness, cold resistance


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