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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�08 2017)
to russian

SCIENTIFIC-TECHNICAL SECTION

Karkhin V. A., Khomich P. N., Ginzburg S. A., Michailov V. G. � Study of thermal processes around moving weld pool by boundary element method

A theoretical-experimental technique for determining the temperature field in a solid part of thin and thick plates to be welded has been developed basing on shape and size of the moving molten pool boundary. Formulation and solution of 2D and 3D heat conduction problems by using the boundary element method are presented. The technique allows the heat source efficiency and thermal efficiency of base metal melting to be found. The temperature field around the pool, the distributions of temperature gradient and cooling rate at the pool boundary are shown by the example of complete penetration laser welding of a 1 mm thick AMg3 aluminium alloy.
Good agreement between calculated and measured temperature cycles and peak temperature distributions is observed.
Key words: laser welding, aluminium alloy, heat conductivity, boundary element method, temperature field, temperature cycles, temperature gradient, cooling rate

Korotkova G. M. � Investigation of the welding arc thermal state when welding with nonconsumable electrode an alternating current of rectangular shape

The research results of the distribution of the blackening optical density characterizing the state of the arc heat flux during aluminum alloys WIG welding in argon at direct and reverse polarity of a rectangular current as well as in the neighborhood of zero when the polarity change is adduced.
Key words: WIG-welding, arc at alternating current of rectangular shape, aluminum alloys, blackening optical density, heat flux at a polarity change

Barabanova �. �., Nabatchikov S. V., Salmin P. A., Semin M. A. � Influence of the oxide melt crystallization on the properties of the laminated composite material aluminum�glass

The main content of the diffusion bonding of a layered composite material (DB LCM), which determines the main features of this process, is the physicochemical interaction at the interface between the aluminum � glass melt synthesized in the oxide system of lead, boron, zinc, silicon, copper.
The influence study of oxide melt crystallization degree on the LCM interphase processes and, as a result, on the structure of the bond zone, and ultimately on the properties of, the establishment of the relationship with the strength of LCM, presented in this paper, is a prerequisite for the development of a competitive composite manufacturing technology and heat exchange equipment on its basis.
Key words: diffusion bond, layered composite, interphase boundary, heat exchange equipment

Shapovalov E. V., Dolinenko V. V., Kolyada V. A., Skuba T. G., Topchev D. D. � Robotic adaptive system for welding pipes and pipe fittings

A methodology of algorithmic and mathematical support creating for an adaptive welding robot is proposed. The application of laser-television and video-pyrometrical sensors as means of the robot adaptation is considered. Special software for the robot "IRB-1600" was prepared, which allowed to perform welding experiments with orbital welding of the root seam and confirming the adequacy of the proposed approach.
Key words: welding robot, manipulator, adaptation, MIG/ MAG welding, automatic control system, laser-television sensor, video-pyrometrical sensor

Matyushkin B. A., Denisov V. I., Tolkachev A. A., Mosolov M. M. � Computational substantiation of the air flow sound velocity application under conditions of electric arc metallization

The application of sound velocity of air flow in conditions of electric arc metallization is substantiated.
The new design of the nozzle apparatus allows using the principle of supersonic air flow outflow in the sputtering technology, contributes to the improvement of the applied layer quality, its physical-mechanical properties and the expansion of technological capabilities in the metallization process.
Key words: electric arc metallization, supersonic nozzle, air flow rate, speed variation patterns

Peshkov V. V., Bulkov A. B. � Influence of the contact surfaces microstructure on the development of the joining process at diffusion welding of titanium

The influence of a layer with a fine-grained structure in the contact zone on the mechanical properties of diffusion-welded joints was establishedon the grounds of the experimental researches results performed on samples from the titanium alloy OT4. The appearance of this layer is due to recrystallization under welding conditions of metal subjected to deformation during preliminary machining. It is shown that the presence of a recrystallized layer in the contact zone, which has a great deformation capacity in comparison with the base metal, will improve the quality of the welded joint by creating favorable conditions for the development of collective recrystallization and the formation of common grains along the butt line.
Key words: titanium alloys, microstructure, diffusion welding, mechanical machining, recrystallization

PRODUCTION SECTION

Shchitsyn Yu. D., Belinin D. S., Neulybin S. D. � Creation of multilayer materials by the method of plasma deposition through the use of a direct action reverse polarity arc

The possibility of obtaining laminated billets from high-alloy steel 10�18�10�by multilayer plasma deposition with reverse polarity current is shown. The investigationresults of the deposited material and the fusion zones between layers through the use of optical and electron microscopy are represented. Optical and electron microscopy showed absence of the internal defects in the laminated material. The derived material has a favorable fine-grained structure. The results of microhardness measurements showed the correspondence of hardness over the material surface with increasing hardness in depth. Defects on the fusion line are absent. The mechanical characteristics correspond to those characteristic for this group of materials. Corrosion studies have shown a material resistance increase in aggressive media obtained at reverse current polarity in relation to direct polarity. The conducted researches allow to recommend the technology of multilayer plasma deposition at operation of a plasma torch on a current of reverse polarity for creating defect-free billets from a homogeneous material.
Key words: reverse polarity current, fusion zone, internal defects, laminated material, mechanical properties, corrosion resistance

Chavdarov A. V., Lyalyakin V. P., Skoropupov D. I., Pershin P. N., Milovanov D. A. � Experience of cooking vessels welding without tacking

The main technical solutions for the creation of automatic installations for welding cylindrical shells with a bottom without stitches are described.
Key words: annular seam welding, automatic centering, automatic welding, programmed control

Shiganov I. N., Gonsales L. F., Bazaleeva K. �. � Structure and properties of wear-resistant coatings from stellite deposited on steel through the use of laser radiation

The features of microstructure and phase composition of coatings of cobalt alloys Stellite 6 on steel AISI 4340, produced using powder laser cladding. It is shown that the hardness and wear resistance of coatings depends on the dispersion structure, its texture and phase composition. Four investigated the optimal deposition rate and the selected best ratio of the geometrical, mechanical and microstruc-tural properties.
Key words: coating, laser, properties, modes, structure, phase

Bichurin Kh. I., Mashkov V. N., Mashkov V. V. � Chemical composition of multifunctional diamond coatings

In this work are presented the chemical coverings of ultrafine diamonds coatings.
Key words: chemical composition, ultrafine diamonds coatings, composite nickel � diamond coating

Frolov V. A., Putyatina L. M., Vlasenko A. N. � Technical and economic diagnostics of of new technologies introduction in welding production

The modern methods of technical and economic diagnostics of the new structures introduction in welding production or new technologies: the method of competitiveness and the method of sectorograms are considered. An analysis of the indicators main groups used to justify the advantages of new designs or technologies is conducted: indicators of functional purpose, reliability indicators and economic indicators. The main methodological features of the use of each method are reflected.
Key words: method of competitiveness, method of sectorograms, groups of functional purpose indicators, reliability, economic indicators, integral indicator of relative competitiveness, innovation introduction efficiency factor, welding production

EDUCATION AND TRAINING

Korobtsov A. S., Rogozin D. V. � Correction of the educational program on the profile of training "Equipment and technology of welding production"

The actual aspects of improving of educational programs taking into account positions of vocational standards are considered, the components of profile competence passport are grounded, the disciplines adjustment of the educational program for "Equipment and technology of welding " profile is proposed.
Key words: educational program, profile competencies, vocational standard, competence passport

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