e12

	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�12 2020)
to russian

SCIENTIFIC-TECHNICAL SECTION

Ilin A. V., Karpov I. G., Kashchenko D. A., Sobolev �. �. � Evaluation of the effect using possibility of contact strengthening in welded joints of high-strength low-alloy steels

The use of the contact strengthening effect at narrow bevel welding of high-strength steels with less durable welding materials is a promising solution many technological problems. However, the method of quantitatively accounting for this effect at the analysis of the static equal strength of the welded joint remains not developed. In this regard, tests of samples with variable bevel parameters and strength combinations of the base metal and weld metal, as well as numerical studies of the FEM processes of their deformation in a 3d setting are performed. On the basis of the obtained results, interpolation relations, which make it possible to predict the strength of a mechanically inhomogeneous welded joint, are proposed.
Key words: high-strength steels, narrow gap welding, contact strengthening

Voronin N. N., Voronin N. Nik., Budarina O. N., Zakharenkova L. V. � Possible reason for the initiation of a microdefect on the rolling surface of electric locomotive tires

The article analyzes the processes occurring on the wheel-rail contact surfaces of the electromobil train at the moment of the start of movement, since the wheel remains stationary and the starting current is equal to the maximum value. As an example, the initial moment of turning on the traction electric motor of an electric locomotive with a heavy train is considered, when voltage is supplied to the traction motors, but the starting currents used in the calculation do not even exceed the operating values. It is shown that in the considered wheel-rail contact there are processes similar to the closing of electrical switches, contactors and other connections of electrical conductors, as well as processes occurring in the first moments of resistance welding. The calculation of heating at the surface points of contact between the wheel rim and the rail is carried out. The calculation showed that even without exceeding the operating current values at individual points, metal fusion is possible, leading to formation of microflaws.
Key words: contact resistance welding, transition resistance, wheel-rail contact, thermal power, temperature, microflaw

Akhunova �. Kh., Dmitriev S. V., Valitov V. A., Galieva E. V. � Finite element modeling of the stress-strain state in specimens from dissimilar Ni-based alloys during pressure welding with displacement

In this paper, the possibility of producing a bimetallic disc-shaft-type part for a gas turbine engine made from dissimilar heat-resistant nickel-based super alloys by means of pressure welding in the presence of shear deformation is considered on the basis of computer simulation. It is shown that the quality of a solid-phase joint of the part depends on the scheme of shaft insertion into the disk, the angle of the shaft taper and the degree of surface treatment.
Key words: pressure welding, finite element modeling, shear strain component, heat-resistant nickel-based super alloys

Polyakov A. Yu., Kulikov V. P., Stepanov �. �. � Parameters selection resistance Kleinschmidt welding of T-shaped joints "plate + pipe"

A calculating method of the required current value for acquisition strong and hermetic T-shaped joints according to the "plate + pipe" scheme (by circular reliefs) with reference to the Joule�Lenz law and the estimation of the heat content of the interelectrode zone in accordance with the heat balance equation is proposed.
Key words: resistance projection welding, T-shaped joint, heat balance equation, Joule�Lenz law, energy, welding current, acute-angled relief, relief settlement, heat removal, heating temperature, mutual metal melting

PRODUCTION SECTION

Koroteev �. �., Kulikov V. P. � Arc welding with two-jet coaxial supply of gas shielding components

The technology of arc welding with the formation of the protective gas atmosphere directly in the arc burning zone by the interaction of two concentric independent flows of argon and carbon dioxide is developed. This technology allows not only to save protective gases, but also to significantly improve the technological characteristics of the process.
Key words: gas-shielded welding, two-jet coaxial feed of mixture components, transfer of electrode metal, welding torch nozzle, transfer of alloying elements, loss of electrode metal

Sliva A. P., Gudenko A. V., Marchenkov A. Yu., Zhgut D. A., Goryachkina M. V., Dragunov V. K. � Mechanical properties of aluminum alloy AMg6 obtained by wire electron beam additive forming

The article discusses the features of producing articles by the method of electron beam additive forming of alloys based on aluminium. The technology of obtaining a thin wall from a deformable aluminum alloy AMg6 is described and the results of mechanical tests are presented. It is shown that the mechanical properties of the AMg6 alloy obtained by the ELAF method meet the requirements of GOST for various types of semi-finished products.
Key word: technology of additive manufacturing, electron beam, aluminum alloys, mechanical properties

Shchitov N. N., Lozovan �. �. � Improving the technology of protective chromium coatings by deposition from organometallic compounds

The revue of multilayered functional coatings concepts is presented and pyrolytic chromium carbide coatings designed for corrosion and wear protection are among them.
They may serve too as one of other functional layers deposited by the known physical, in particular ion-plasma method. Such integration may be realized in modular conveyor units. The multilayered coatings geometric parameters optimization is to be made on the basis of the optimal control theory.
Key words: multilayered functional coatings, pyrolytic chromium carbide coatings, optimal control theory, corrosion resistance, wear resistance

Lyushinskiy A. V., Umerov R. A. � Diffusion welding of copper to silver

Studied features forming of compounds copper from nickel and silver at different options regimes of diffusion welding. Investigated distribution element at zone contact at diffusion exchange this element. Identified value diffusion zones welded compounds, responsible, at end eventually, behind their quality. Established best options diffusion welding.
Key words: diffusion welding, welding joint, cooper, silver, mechanical durable

INFORMATION

Alphabetical Index of Articles for 2020

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