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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�05 2018)
to russian

SCIENTIFIC-TECHNICAL SECTION

Lebedev V. A., Novikov S. V. � Mathematical model of forming an electrode metal droplet during mechanized arc welding

The dependences of the volume growth of a droplet of a liquid metal at the frequency characteristics of the weld pool oscillations at surfacing are determined. The possibilities of realization of surfacing under these conditions, both with short circuits of an arc gap and without them are considered. The corresponding dependences for drops volume and frequency of droplet transfer to the weld pool had been received.
Key words: drop volume, oscillations of welding pool, frequency characteristics of transfer, surfacing

Parshin S. G. � Investigation of underwater hyperbaric FCA-welding of highstrength steel X70 in protective gases at pressures up to 0.6 MPa

The research materials of orbital hyperbaric FCA welding of pipes from steel with strength class API X70 with application of gas-shielded wire at excess gas pressure in the hyperbaric chamber up to 0.6 MPa are presented. The properties of welded joints at the level of the normative documentation requirements are ensured. It is shown, that for ensuring high reliability of welded joints when welding at great depths, it is necessary to use powdered wires with an increased content of active complex deoxidizers in the charge, as well as inert protective gases.
Key words: argon-arc welding with tungsten electrode, consumable electrode welding, gas-shielded flux-cored wire, orbital hyperbaric welding

Efremenko B. V., Belik A. G., Chigarev V. V., Shimidzu K. � Interphase distribution of elements at powder band deposition with beads overlapping

The character of the chemical elements interfacial distribution in the coating obtained by electric arc deposition of the powder band PL AN-111 with 50 % beads overlapping is studied with application of the energy-dispersive spectroscopy. Investigation of the welded layer cross section revealed several structural zones, differing in phase chemical composition. Presence of eutectic carbides with a reduced content of chromium and an increased content of nickel is fixed in the beads overlapping area. A strong depletion of the matrix with chromium is recorded above the overlapping zone, which is associated with the formation of large primary carbides M7C3 containing up to 57 % Cr. A region of secondary carbides of non-stoichiometric composition is indicated with a corresponding depletion of the matrix over chromium is indicated under the overlapping zone.
Key words: depositing, beads overlapping, carbides, matrix, alloying elements

Grigoryants A. G., Shiganov I. N., Tretyakov R. S. � Creation of composite coatings from metal powders by laser three-dimensional deposition

In the article the questions of application of additive technologies volume laser welding to create coatings from metal and the metal-ceramics composite materials. The process of obtaining compositions of the steel-TiC, Al-SiC, Ni-WC. Shows the advantages of these materials and their production technology. Considered modes of technology process, the scheme of application of the material and their influence on structure and mechanical properties. As an example, obtaining a friction material describes the technology of obtaining and properties of compositions of aluminium � silicon carbide.
The possibilities of enhancing properties of the compositions of the Ni-TiC by adding nanoparticles and rare-earth elements.
Key words: composite material, laser, farming, technology, modes, structure, properties

Bigus G. A., Vybornov A. P., Rykova I. S. � The maximum allowable value determination of the stress coefficient rate in welded joints vessels operating under pressure

In the article the questions connected with definition of the maximum admissible values of the stress rate coefficient KI in welding joints of vessels and the apparatuses working under pressure are considered. For establishing such values an engineering approach is proposed, which consists in replacing the existing pore or chain of pores with an equivalent crack. The length of such a crack, together with the radii of plasticity rp is the same as the pore diameter with the pore plasticity zones. The dependence of the maximum permissible values of stress rate coefficient in welding joints of the third category vessels made from steel 09G2S from the wall thickness of the apparatus is obtained.
Key words: diagnostics, efficiency, welding defect, stress rate coefficient, plasticity zone, equivalent crack

PRODUCTION SECTION

Kazakov Yu. V., Tabakin �. �., Andreev S. A., Kaplin A. V. � Influence of the assemble quality on the welding process of the thin-walled articles for atomic equipment

The influence research results of the welded edges gaps and displacements on the end welded joints quality of thin-walled articles from aluminum alloys at pulsed laser welding are presented. The maximum permissible values of gaps and displacements when assembling weld joints are indicated. Technological methods that allow to improve the welded joints quality of atomic engineering products are proposed.
Key words: laser welding, end joints, aluminum alloys, thin-walled articles, clearances, edge displacement, connection quality

Aulov B. F., Ishkov A. V., Ivanayskiy V. V., Lyalyakin V. P., Krivochurov N. T. � Influence of the boron alloying on the welding joints for steel 65G

The article presents the results of studies on the effect of boron additives in a welded bath. It is shown that the introduction of boron promotes the formation of new physical, highly disperse and structured phases in the seam which will undergo a dispersed or zone simplification, inhibit the development of cold cracks. The results of the investigations make it possible to characterize quantitatively and qualitatively the influence of boron on the structure of the welded seam.
Key words: boron, borating, structure, welded seam

Elagina O. Yu., Buryakin A. V., Volkov I. V., Nesterenko N. S. � Features of the metallize coating for protection from corrosion of the field oil pipeline annular welded nts

The questions connected with application of metallization gas flame coatings from self-fluxing nickel-base alloys for corrosion protection of annular welded joints of field oil pipelines are considered.
Key words: welding joint, corrosion impact, welding joint insulation, gas flame coating

Matyushkin B. A., Chavdarov A. V., Denisov B. I., Tolkachev A. A., Mosolov M. M. � The role of electric arc metallization in the restoration technology of the APC details

In this article, we consider issues related to the development of supersonic sputtering technology in the conditions of heated compressed air. The dependence of the influence of the metallization distance on the adhesion-cohesive properties of coatings is established.
Key words: electric arc supersonic metallization (EDSM), innovative technology, adhesion, cohesion, dispersed flow

Strizhakov E. L., Neskoromny S. V., Ageev S. O. � Magnetic-impulse welding of the secondary-emissive cathodes for electrovacuum apparatus

The article presents studies of the magnetic pulse welding process of secondary emission cathodes made from dissimilar alloys. It is proposed to carry out preliminary heat of the assembled unit for welding in vacuum with the subsequent magnetic � impulse impact in the radial direction through the dielectric container on the connected surfaces heated to premelting temperatures for welded surfaces activation and contaminations removal. The parameters of the MISV process and the limitations associated with the mechanical destruction of the welded assembly, flash-off or faulty fusion, affecting the strength of permanent joints are revealed. The microstructural analysis showed no formation of common grains. Hardness in the joint zone is increased, which is typical for the formation of the joining in the solid phase.
Key words: emitter, core, satellite, magnetic pulse welding, solid phase, dissimilar alloys, pulse energy, magnetic pressure, nonconducting gap, heating temperature

INFORMATION

Korotkov V. A. � Scientific-technical conference "Repair welding and deposition"

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