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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�04 2019)
to russian

SCIENTIFIC-TECHNICAL SECTION

Boldyrev �. �. � The chemical composition formation of the weld metal during welding over a layer of modifying granulated additive

The formation analysis of the weld metal chemical composition during welding of bridge structures made of 10��ND steel under the flux over a layer of granular modifying additive is given. It is shown that the chemical composition of the weld metal is determined not only by the composition of the materials involved in the welding process, but also by the trajectory of their delivery to the weld pool. The greatest effect of grinding grain in the weld metal takes place when the modifier enters the bath, bypassing the arc column. On the grounds of thermodynamic analysis it is shown that at welding over a layer of granulated additive, titanium dioxide modifying particles are captured by liquid metal flows, bypassing the process of dissociation. At the same time the refractory particles of the intermetallide compound TiAl2O5, which are the nuclei of the solid phase in the crystallization zone of the weld pool, are formed as a result of interaction with aluminum oxide coming from the flux. The relationship between the particle size of TiO2 in the composition of the granular additive and the size of non-metallic inclusions in the seam is established.
Key words: welding of low-alloyed steel with granulated modifying additive, methods of modifier introduction into the weld pool, the chemical composition formation of the weld metal

Kibitkin V. V., Pleshanov V. S., Solodushkin A. I., Gnyusov S. F., Khatkov D. N. � Relationship of deformation meso- and macrostructures types with the staging of damage accumulation in welded joints of stainless steel under high-cycle fatigue

The fatigue fracture mechanism of spot-welded joints of stainless constructional steel at multi-cycle loading condition is studied using the method of digital images correlation.
Analysis of deformation meso- and macrostructures was carried out within the framework of the four-stage scheme of deformation and fracture of welded joints identified in the work. Characteristic fields of displacement vectors are presented and quantitative indicators and duration of damage accumulation stages are determined. On the basis of inverse pseudo-images, new types of deformation structures (trickle and cellular hexagonal) have been discovered.
Key words: fatigue fracture mechanism, stainless steel, spot welding connection, types of deformation structures

Arkhipov V. E., Bortnikov M. V., Londarskiy A. F., Moskvitin G. V., Pugachov �. S. � Gas-dynamic processing of aluminum alloys welding joints

The article presents the research results of hardness, residual stresses and ultimate strength of aluminum alloy 1151 and the welding joint after surface treatment with a mixture of hard and ductile particles by the method of cold gas-dynamic sputtering using the DIMET-404 unit. It is shown that the hardness of a plate from an alloy decreases after sputtering from 1300 MPa to 350 MPa and hardness change is observed at a distance of up to 145 μm from the surface. The sputtering of aluminum coating on a plate of aluminum alloy at a temperature of 360 �C increases the residual compressive stress.
Treatment of the welding joint and heat-affected zone is attended by a decrease in the magnitude of residual stresses and a decrease in the area of their manifestation. Tensile tests of aluminum alloy specimens with a coating reveal a tendency to increase the ultimate strength of an aluminum alloy with a welded seam under certain parameters of sputtering an coating.
Key words: aluminum alloy, ultimate strength of the alloy welding joint, cold gas-dynamic sputtering, applied coating parameters

Anakhov S. V., Pykin Yu. A., Matushkin A. V. � Improving the efficiency of the gas-vortex stabilization system in plasmatrons for high-precision cutting of metals

The analysis of several constructive solutions in plasmatrons for metal cutting is done. Influence of such solutions on efficiency of plasma gas uniformity in cross-section of an air-gas path is investigated. The stabilizationsystem using two (forming and stabilizing) swirl units is offered. The effect of improvement of stabilization due to increase of uniformity degree of plasma gas flow distribution is shown. The optimum relative positioning of swirlunitsis determined.
Key words: plasmotron, designing, flow dynamics, velocity, dynamic pressure, air-gas path, profiling, gas rotating stabilization, swirl canals, expansion chamber, plasma gas, plasma jet, computational modeling

PRODUCTION SECTION

Parshin S. G. � Underwater wet FCA-welding of high-strength steel X70 through the use of flux-cored electrode

The research results of underwater wet FCA-welding of samples from high-strength steel based on the use of fluoric flux-cored electrode with metallurgical activity in the aquatic environment are adduced. The best results were achieved in underwater welding with fluoric flux-cored electrode with a TiO2-CaF2 charge system. A favorable structure and mechanical properties of the welding joint are ensured.
Key words: underwater wet welding, fluoric flux-cored electrode, structure of weld metal, mechanical properties of welding joint

Grigorev V. V., Muravev V. I., Bakhmatov P. V. � The study of the specific defects occurrence at electron-beam welding (EBW) of titanium alloys

The article presents an analytical assessment of specific defects in electron-beam welding of titanium alloys; the defects distribution locations in areas of the welding joint are established. It was found by analysis that the formation of specific defects (dark streaks, pore chains) and their locations are influenced by EBL modes (welding speed, amperage) and technological operations of preparing edges for welding (presence of capillary-condensed moisture). Other defects (faulty fusion and incomplete fusion) are affected by the EBL modes, the error in the adjustment of the electron beam, the insufficient heat input and the penetrating power of the beam.
Key words: defects in electron-beam welding, titanium alloys, welding joint, edge preparation, pores in the weld metal

Antsiborov A. N., Klimov A. S., Klimov V. S., Kudinov A. K. � Contact welding control under disturbance conditions

A comparative evaluation of the control algorithms technological capabilities for resistance welding by electrical parameters is carried out: welding current, voltage drop across the electrodes and energy release between the electrodes. The effect of perturbations on the strength of welded joints is researched.
Key words: contact welding, automatic control, electrical parameters

Volkov S. S., Korolev S. A., Rozanov D. S. � Development of the waveguide systems designs for ultrasonic welding of plastic products

In article basic elements of cars for ultrasonic welding of plastic are briefly described. The main materials of which elements of ultrasonic waveguide oscillatory systems are made are given.
In article communication of amplitude of fluctuations of the welded material with a ratio of wave resistance of material of a product and a wave guide and wave guide tool geometry at ultrasonic welding of plastic is considered. It is shown that at ultrasonic welding of products from plastic of big thickness application of wave guides from aluminum alloys with a diameter of a working end face of 15 mm is expedient.
Key words: ultrasonic welding, amplitude of fluctuations of a wave guide, working edge of a wave guide, strengthening coefficient, frequency of fluctuations, resonant length of a wave guide

STANDARDIZATION, PRODUCTION QUALITY

Barabanova �. �., Polunin V. A., Salmin P. A. � Diffusion Welding: Quality Management

This article is devoted to the problem of the welded joints quality ensuring. The processes and factors that form the quality management system in the manufacture of welded parts and units by the method of diffusion welding are considered in this article.
Key words: diffusion welding, quality planning, welded joint, quality ensuring, quality improvement, quality management

ECONOMIC AND PRODUCTION ORGANIZATION

Frolov V. A., Putyatina L. M., Vlasenko A. N., Arsenyeva N. V. � Analysis of factors affecting the level of costs in the welding industry of the Russian Federation

The article discusses the main factors affecting costs in the welding industry machine-building enterprises. Notes the main features of welding production. Classify the main factors affecting costs and the cost of production of welding production. Analyzed the system of grouping costs by economic elements and articles of the cost price of welding products. Describes an integrated approach to the analysis of opportunities to reduce costs. Examines the main indicators of production costs in this industry.
Key words: cost of production welding the production, classification factors, internal factors, external factors, estimates of the cost of production of welding products, rates cost

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