Journal "Svarochnoe Proizvodstvo"ISSN 0491-6441
Contents (№08 2022)
to russian


SCIENTIFIC-TECHNICAL SECTION

DOI: 10.34641/SP.2022.1053.8.053
Netyaga A. V., Kuskov Yu. M., Bogaichuk I. L., Proskudin V. N., Biktagirov F. K., Ignatov A. P., Zhdanov V. A., Fesenko M. A. — The structure of high-chromium cast iron deposited in a current-carrying mold using large-section electrodes and shot

The structure formation of high-chromium cast iron deposited in a three-section current-supplying mold ∅180 mm has been investigated. The influence of the type of the surfacing material on the formation of the structure of the deposited cast iron has been established. During electroslag cladding with shot, a dendritic structure with an austenitic matrix is formed, and in the case of using electrodes of a large cross-section of the same chemical composition, the structure becomes non-dendritic with a martensite matrix. The structure of cast iron, deposited with a large-section electrode in a current-supplying mold and in a conventional mold of the same size, differ in the degree of dispersion: a more dispersed structure is formed during surfacing in a current-supplying mold.
Key words: electroslag surfacing, current-supplying mold, high-chromium cast iron, large section electrode, shot, microstructure of deposited cast iron

DOI: 10.34641/SP.2022.1053.8.054
Fedoseeva E. M., Olshanskaya T. V. — Study of the effect of thermal vacuum treatment and electron beam welding on the formation of the phase composition of the aluminum alloy 1420

1420 aluminum alloy relates to Al-Mg-Li alloying system, is widely used in the manufacture of lightweight constructions in the aerospace industry, its weldability has a series of features, including the tendency to high solubility of hydrogen in the molten state, which leads to porosity. Thermo vacuum treatment (TVT) of the material before welding is one of solutions to reduce porosity. The paper presents the studies of TVT and Electron Beam Welding (EBW) influence on the formation of welded joints and phase composition of 1420 aluminum alloy. The results of metallographic studies and thermodynamic calculations in welded joints are presented.
Key words: aluminum alloy, alloying system, thermal vacuum treatment, phases, electron beam welding, microhardness, thermodynamic calculation, cooling rate, weld, inclusions

DOI: 10.34641/SP.2022.1053.8.055
Utkin I. Yu., Singaevsky V. N., Gorbunov D. A. — Assessment of the role of alloying steels of strength category K65 from the standpoint of ensuring high values of the mechanical properties of welded joints

The effect of alloying steels of the K65 strength category on the change in the kinetics of austenite decomposition at various metal cooling rates, which are typical for automatic multiarc submerged arc welding, manual arc welding, and laser welding, has been studied. The change in impact strength and hardness of the metal of the overheated zone is shown depending on the chemical composition of steels and cooling rates. For steel with the best performance, mechanical characteristics were determined on a real welded joint.
Key words: austenite phase transformation kinetics, alloying elements, welded joint overheating zone, mechanical properties

DOI: 10.34641/SP.2022.1053.8.056
Erofeev V. V., Troyanovskaya I. P., Ignatiev A. G., Sharafiev R. G., Gilmanshin R. A. — Analytical dependence of the level of residual stresses in a tee joint on the technological parameters of welding and weld geometry

Residual stresses arise in the weld due to uneven heating and cooling. In the article, an analytical dependence of plastic deformation on the magnitude of residual stresses is obtained, taking into account concentration, based on the Neuber method.
Using the method of heat input, the dependence of the transverse deformation due to shrinkage of the metal with the technological parameters of welding was obtained. As a result, a method was developed for calculating the level of residual stresses, taking into account the concentration of stresses, technological parameters of welding and the geometric dimensions of the weld.
Key words: tee weld, residual stresses, plastic deformation, metal shrinkage, heat input, Neuber method, welding technological parameters

PRODUCTION SECTION

DOI: 10.34641/SP.2022.1053.8.057
Mishigdorzhiin U. L., Ulakhanov N. S., Semenov A. P., Milonov A. S., Dasheev D. E., Gulyashinov P. A. — Electron beam alloying of low-carbon steel with boron carbide and aluminum

The effect of electron-beam alloying (EBА) with boron carbide and aluminum on the microstructure, composition and microhardness of the surface layer of low-carbon steel St3 is shown. EBA led to the formation of a coating with a thickness of up to 0.3 mm with a predominant dendritic structure. The maximum microhardness in the layer was 670 HV, which significantly exceeds the hardness of the base metal. XRD analysis revealed the presence of iron boride and carbide on the surface of St3 steel.
Key words: electron beamalloying, borides, carbides, low-carbon steel, microstructure, microhardness

DOI: 10.34641/SP.2022.1053.8.058
Gareev I. S., Sobko S. A., Pisarev M. S. — Technological features of energy-saving argon-arc welding of hull structures made of titanium alloy OT4

The paper presents the results of studies of the equal strength of welds and the base metal of joints with a thickness of 1.5 to 10 mm under the condition of one-sided formation of welds with through penetration. According to the criterion of energy input (energy input), the influence of two variants of welded joint designs on the features of weld formation was studied with a generalization in the form of empirical dependencies. For the formation of butt joints up to 2.5 mm thick with the required weld profile from the outside, welding in one pass using a welding wire is recommended. For connections with a thickness of more than 2.5 mm, a combined design with a V-shaped groove of edges and the maximum possible height of blunting with a minimum height of the groove to be filled is proposed.
Key words: titanium welding, heat input, welded joint design, through penetration, equal strength of joints, weld geometry, new welding method

DOI: 10.34641/SP.2022.1053.8.059
Ryabtsev I. A., Lentyugov I. P., Bezushko O. N., Goncharova O. N., Ryabtsev I. I., Lukyanenko A. A. — Influence of methods of preparation of a charge of flux-cored wires on the structure of the deposited metal and the environmental safety of the working area during arc surfacing

The results of the study of the structure and distribution of the main alloying elements and non-metallic inclusions in the metal deposited under the flux by a powder wire with a charge of high-alloy ligature obtained by electroslag remelting of abrasive processing waste of high-speed steels and a powder wire of similar composition made by conventional technology with a charge of ferroalloys are presented. In accordance with the existing standards, a sanitary and hygienic assessment of two powder wires was also carried out. Recommendations on the environmental safety of the working area during arc surfacing with submerged powder wires are proposed.
Key words: arc surfacing, powder wire, powder wire charge, welding aerosol, harmful substances, environmental safety

EDUCATION AND TRAINING

DOI: 10.34641/SP.2022.1053.8.060
Malyshev E. N., Zenkin N. V. — Development of undergraduate educational programs in several areas of training

The article presents the main provisions for the development of bachelor's degree programs in several areas of training at once on the basis of an enlarged group of directions "Mechanical Engineering". The features of the formation of curricula and a set of competencies for graduates of such programs are revealed.
Key words: specialist training, higher education, educational programs, bachelor's degree program

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