Journal "Svarochnoe Proizvodstvo"ISSN 0491-6441
Contents (№07 2021)
to russian


SCIENTIFIC-TECHNICAL SECTION

DOI: 10.34641/SP.2021.1040.7.029
Petrov S. Yu. — Modernization of approaches for analyzing the state of the process of performing welded joints

Based on the system analysis, a classification of the processes occurring during the formation of a welded joint is developed.
Key words: mathematical model, welded joint, welding process, welding mode, welding bath, thermal cycle, structure, mechanical properties

DOI: 10.34641/SP.2021.1040.7.030
Saraev Yu. N., Semenchuk V. M., Lunev A. G., Nepomnyashchy A. S., Grigorieva A. A. — Integrated assessment of heat and mass transfer of arc surfacing processes with coated electrodes

The article presents the results of an integrated assessment of the heat and mass transfer of arc surfacing processes with T-590 coated electrodes from two manufacturers.
It is experimentally proved that the instability of the arc surfacing process depends on the energy parameters of the mode and on the method of feeding the electrode. It is shown that the pulsed nature of changes in the energy parameters of the welding mode has a favorable effect on the heat content of the weld pool melt. This advantage provides an adjustable heat input into the applied coating, which is accompanied by an increase in its physical and mechanical characteristics. The performed studies confirmed the validity of the need to study the thermokinetic characteristics of heat and mass transfer in the process of arc surfacing with coated electrodes, and also allowed us to assess their impact on the stability of technological processes.
Key words: surfacing, heat and mass transfer, energy parameters, current, voltage, linear energy, frequency, heat input, all-in-one connection, welding bath

Semenov Yu. I., Alyakrinsky O. N., Bolkhovityanov D. Yu., Devyataykina T. A., Kosachev M. Yu., Logachev P. V., Cooper E. A., Ovchar V. K., Repkov V. V., Starostenko A. A., Tsyganov A. S. — Laser-heated cathode electron beam source for Electron beam technologies

A new source of an electron beam with laser heating of the cathode is presented. The general description, the main parameters and the arrangement of the electron beam source are given. The cathode assembly and its operation features are described, which consist in controlling the emission current from the cathode by changing the cathode temperature by controlling the laser heating power. With this method, due to the heat capacity of the cathode and the parts nearby, the time to reach the set current level of the source from the moment the laser power is applied is several seconds. A method is proposed to reduce this time to fractions of a second by forcing the heating power at the beginning of turning on the heating and introducing preheating, and it is also proposed to stabilize the source current by introducing feedback of the heating power control signal with the current signal of the high-voltage source of the electron gun.
The source current control range is discussed.
Key words: electron beam gun, laser cathode heating, cathode assembly, cathode emission current, electron beam current control range

DOI: 10.34641/SP.2021.1040.7.031
Dmitriev S. F., Malikov V. N., Ishkov A. V., Voynash S. A., Vornacheva I. V., Sokolova V. A., Remshev E. Yu., Gusev A. S. — Superminiature eddy current converter for the study of defects in high-strength steel welds

This article presents the results of the work on the creation of a flaw detection system focused on the study of high-strength steels. Welded joints of transformer tanks made of type 08G2B steel were chosen as the object of research. The choice for this type of material fell due to the ultra-low carbon content in it, which opens up prospects for the use of eddy current non-destructive testing methods. To carry out direct measurements, a scanning unit was designed and brought to an optimal state, including a converter using the principles of eddy currents and having three circuits assembled on a ferrite core, brand 80NMZ. The installation was tested on samples with model continuity defects (cracks and holes). Also, in the framework of the work, the modeling of corrosion defects in welded joints was carried out.
Key words: flaw detection, steel, eddy currents, eddy current control, non-destructive testing, weld, corrosion defect

PRODUCTION SECTION

Podashev D. B. — Study of the part edge quality at machining an industrial robot

The need to replace manual labor with mechanized and automated is an urgent problem of modern engineering. The possibility of using an industrial robot to perform finishing machining of parts (rounding edges) is considered. The dependences of the machined edge quality indicators according to geometric accuracy (location deviation and relative error in roundness) and surface roughness from operating parameters when processing with radial brushes von 3M are studied. The empirical dependences of the edge location deviation and the roughness of the treated surface from the deformation of the brush, cutting speed and feed are obtained. The utilization of polymerabrasive brushes for rounding the edges provides all the requirements related to the quality of the machined edges. The obtained formulas make it possible to determine the machining regimes under which the required quality of the machined edge is ensured.
Key words: industrial robot, electrospindle, radial polymer-abrasive brush, position deviation, roughness, cutting force

Ivanov N. I., Borisov P. Yu. — Investigation of the influence of the shape of reliefs and technological factors on the process of contact welding of interelement compounds of lead-acid batteries

The article reflects the results of studies of welding processes of inter-element joints of lead borns with two types of reliefs through holes in the partitions of the battery housing made of thermoplastics, carried out on an experimental installation with two types of compression mechanisms — with pneumatic and with combined drives.
Key words: welding of inter-element lead borns, relief welding, accumulator, contact welding

DOI: 10.34641/SP.2021.1040.7.032
Morozov V. A., Pashkov I. N. — Influence of the shape and particle size of powder solders on the properties of plasticized powder tapes

An actual problem when using powder solders is their dosage. The quality of the solder joint largely depends on the accuracy of the dosage, the location on the node, the uniformity of the application and other factors. To solve these problems, various technological methods of applying solders, as well as semi-finished products from powders, including powder tapes on an organic binder, are used. In this paper, the main requirements for powder tapes are formulated. The influence of the physical properties of powder materials, such as particle size and shape, bulk and pycnometric densities, on the uniformity of the particle distribution in the tape, as well as the density of the solder tape, is considered. To assess the effect of the shape and size of the particles on the properties of the tape, three powder solders were used in the study: spherical copperphosphorus solder P14, composite nickel solder VPr11-40N in the form of a mechanical mixture of spherical and rounded particles,and plate copper-nickel solder MNMc 9-23.5.
The technology for producing powder tapes with the calculation of the optimal amount of binder depending on the shape of the particles is developed and described, methods for determining such parameters of the tapes as the uniformity of distribution and the density of the powder solder in the volume are developed. Recommendations on the choice of the shape and size of the particles for obtaining the most dense and uniform solder tape are formulated.
Key words: powder solder, powder alloy, powder tape, powder tape on organic binder, P14, VPr11-40N, MNMc 9-23,5

LABOR PROTECTION

Vasilyeva E. V., Chibinev N. N., Yakovenko E. A. — Electric holder primary fire extinguishing agent

The necessity of modernization of the electrode holders is justified. Additional factors affecting the fire hazard of fire operations are identified. The importance of primary fire extinguishing means in the elimination of emergency situations related to fires is shown. The results of the efficiency of the modernization of the electrode holders in the elimination of fires during welding operations are presented.
Key words: resonant fires, regulatory framework, welding and fire works, electric holder, primary fire extinguishing means, portable fire extinguishers

ECONOMIC AND PRODUCTION ORGANIZATION

Fedorov V. A., Malyshev E. N., Malyshev I. E. — Investigation of the flexible production systems performance by the method of statistical tests MONTE-CARLO

The article presents the results of statistical modeling of the operation of a flexible manufacturing systems. The system is designed to produce connecting sleeves for electrical cables. Variable parameters: a individual program of launching products into production and a need of changing settings hopper feeder. The article suggests an integral approach for calculating the coefficient of machine flexibility as an indicator of the efficiency of flexible manufacturing systems.
Key words: efficiency of flexible manufacturing systems, hopper feeder, statistical tests


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