e3

	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�3 2012)
to russian

SCIENTIFIC-TECHNICAL SECTION

Korotkova G. M. � Research of the thermal state of a welding ark at the change of polarity of alternating current

Research results of distribution of the optical density of the blackening of a film which characterizes existence of the temperature "pit" at the WIG-welding of aluminium alloys at the change of polarity of sinusoidal current are covered. Decrease of the concentration of electrons in the arc space is 9,8 and 11,8 times lower depending on polarity of current is established and conditions of stable repeated arc striking at the change of polarity of current are formulated.
Key words: WIG-welding, alternating-current arc, aluminium alloys, optical density of the film blackening, heat flow, temperature "pit"

Parshin S. G., Parshin S. S., Buerkner G. � Increase of efficiency of WIG-welding of steel and aluminium alloys at the introduction of superdispersed particles of activating fluxes

Research results of influence of superdispersed activating fluxes on the features of a welding ark and formation of welded joints at the welding with direct and alternating current for the purpose of increase in productivity of automatic argon-arc welding of steel and aluminium alloys and improvement of welded joints quality are covered.
Key words: welded joints, activating fluxes, argon-arc welding, productivity, quality

Shipilov A. V., Yerofeyev V. A., Poloskov S. I. � Detection of optimal conditions of fusion of additional wire the automatic orbital welding of steel pipelines

Physicomathematical model of fusion of a wire at the TIG-welding is developed for detection of maximum accepted values of feed speed of addition at the orbital non-consumable electrode arc welding and for exception of lack of fusion of edge preparation or between layers of a weld. As a criterion of optimal wire feed speed it is suggested using the ratio between speed, power and diameter of the arc flame at which stable fusion of a wire is ensured. Simulation of formation process of a weld confirmed acceptability of the suggested criterion.
Key words: pipeline, compressor station, non-consumable electrode, orbital welding, additional wire, welded joint, weld pool

Poletayev Yu. V. � Influence of chemical microheterogeneity on tendency to the local destruction of metal in the heat affected zone (HAZ) of welded joints

The mechanism of influence of chemical and structural microheterogeneity on formation of tendency to local destruction of metal in the heat affected zone (HAZ) of welded joints of steel 12�18�12� under conditions of high-temperature low-frequency low-cycle load is theoretically substantiated and experimentally confirmed. The method for estimated probability of fluctuating initiation of areas of chemical microheterogeneity in view of growth of austenitic grain and influence of heat input is developed.
Key words: welded joints, heat affected zone HAZ, chemical microheterogeneity, optical and electron microscopy, low-frequency low-cycle load, local destruction

Korotkov V. A., Ananiev S. P., Shekurov A. V. � Research of influence of cooling rate on the quality of blanket at the plasmic hardening

Calculation of cooling rates, heating temperature and width of hardened lines at the surface hardening by the electric arc confirming probability of qualitative performance of the surface hardening of parts without application of additional water cooling of coatings is given on the basis of the theory of thermal process by N. N. Rykalin.
Key words: surface hardening, cooling rate, heat source, heating

PRODUCTION SECTION

Fainberg L. I. � Optimization of the phasing of electrodes at the four-arc welding of gas pipes of 6�10 mm in wall thickness

Optimal phasings of electrodes and conditions of the submerged four-arc welding of thin-walled tubes (6�10 mm), ensuring the height of convexity and width of a weld not more than 2,5 and 20 mm, respectively, are determined.
Key words: submerged multi-arc welding, thin-walled tube, large-diameter gas pipe, welding conditions, phasing of electrodes, electromagnetic interaction of arcs

Khorev A. I. � Foundations of alloying and the theory of heat treatment of welded joints of titanium β-alloys

Research results of the alloying element effect on the mechanical properties of titanium β-alloy welds are given. Combined alloying and microalloying grounds are stated. Alloying analysis of the domestic and foreign titanium β-alloys is carried out from the stand of our created theory of combined alloying principal concepts of improving mechanical properties of the β-alloy welds are defined.
Key words: titanium alloys, alloying, microalloying, mechanical properties

Anakhov S. V., Pykin Yu. A., Matushkin A. V., Shakurov S. A. � Principles of safe projecting of air-gas circuits of plasmatrons

The analysis of typical plasmotron for metal cutting is done. Influence of the air-gas path features on their dynamic and power characteristics is investigated. Principles of designing for cutting plasmotrons are offered, allowing to raise efficiency and acoustic safety of their work. Approximating dependences for the simplified analysis of designed constructions efficiency are resulted.
Key words: plasmotron, flow dynamics, dynamic pressure, swirl canals, plasma gas, plasma jet, air-gas path, profiling, throat, an acoustic spectrum, sonic frequency, noise radiation

Soloviev R. Yu., Vorobiev P. V., Litovchenko N. N. � Metal-carbon-thermal methods of decrease of the oxidation of dispersed metal at the electroarc metallizing

Now there are no system decisions on prevention at electroarc metallization intensive oxidation of the dispersed metal. For the purpose of a solution of a problem of decrease in negative influence of oxidation in the GNU of the state thread research on use metallokarbotermi processes is executed. For metallokarbotermi and an alloying it is used aerosol fluxing, consisting in addition to compressed air of a water solution of the Substances containing aluminum, carbon, and as a pine forest and nitrogen. Results of effective combined method: increase adhesion-cohesion strength of metal coating in 2,0�2,3, density in 1,28, microhardness in 1,3 times in comparison tempered.
Key words: electroarc metallization, metallokarbotermia, metal oxidation, aerosol, water solution, adhesion, covering density, microhardness

Gadalov V. N., Salnikov V. G., Statinov V. V., Rozina T. N., Lyakhov A. V., Romanenko D. N., Markelov Ye. A., Shestavina S. V. � Optimization of conditions of deposition of TiN ion-vacuum coating

Results of optimization of conditions of TiN deposition for increase in the resistance of the cutting tool of hard alloy ��6� are covered. Regression equations which indicate strong influence of technological parameters of the process of condensation with ion bombardment on the coating formation and functionality of plates of hard alloy are obtained. The factors which are responsible for increase in the resistance at the deposition of ion-vacuum coating are established as well as the optimal partial pressure of nitrogen in the chamber making it possible to have influence on the structure and properties of coatings.
Key words: hardening, wear resistance, hard alloy, optimization

Panin V. N. � Certification of welding production

A facultative certification scheme for the objects welding engineering is worked out. It is an intersectorial scheme strictly welding-oriented; its range of application has no limits by analogy with foreign certification schemes.
Key words: welding engineering, certification, quality, reliability, standards

INFORMATION

Ivanov A. N. � The 11th specialized exhibition "Advanced Automation Technologies � 2011"

* * *

E. N. Kablov is 60 years old

BIBLIOGRAPHY

RF patents for the inventions in the field of welding

��: 127015, ��, �/� 65.
��.: +7 (495) 640-7903
e-mail: ic@ic-tm.ru

� 2008-2024, ��
�� - www.itsite.ru