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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�2 2013)
to russian

SCIENTIFIC-TECHNICAL SECTION

Kostin V. A., Grigorenko G. M. � Effect of thermal cycle of welding on microstructure and properties of new structural steels strengthened by carbide and carbonitride

Using a Gleeble 3800 studied the effect of welding thermal cycle on the microstructure and properties of metal HAZ new steels with carbide and carbonitride type hardening � 06�� and 15��. Established that the cause of low plastic and viscous properties of welded joints of steel 15�� associated with the dissolution of carbide and nitride phases (Fe3C, AlN, TiC) at the site of a large grain HAZ.
Key words: the thermal impact, hardening, microstructure, bainite, martensite, carbides

Novoseltsev Yu. G., Utkin Yu. G., Demchenko A. I., Bayandina O. V., Mikhailova D. S. � Effect of chromium on weld metal plasticity at plasma welding of articles from chromic bronze

Research results of the effect of chromium on weld metal plasticity at plasma welding, causes for amount reduction of chromium, as well as conservation technique of its content at plasma welding of crystallizer pans are covered.
Key words: plasma welding, metal plasticity, chromic bronze

Gurevich L. M., Trykov Yu. P., Kiselev O. S. � Formation mechanism of structure mechanical inhomogeneity when explosion welding aluminium and titanium

The results of the study of zone of titanium-aluminum composite, welded to the explosion of modes close to the upper boundary of weldability are resulted. Local heterogeneous melts consisting matrix of a solid solution based on aluminum with particles of titanium aluminide. The increase in strain energy led to an increase in area, extent and volume content of aluminide particle. The formation of local melts almost did not reduce their ability to limit deformation.
Key words: titanium, aluminum, layered composite, explosion welding, melted metal, micromechanical properties, intermetallic

Vereschago Ye. N., Kostyuchenko V. I. � Physical and mathematical model of plasmatron feed circuit

Results of physical and mathematical model development for the power supply-arc system at plasma-arc cutting are considered. The model takes into consideration arcing process instability at small current (pilot arc), arc attainment of working conditions and nonstationarity, i.e. direct current arc bridging mechanism resulting in changing arc length and large-scale ripple current and voltage.
Key words: plasma, resonance topology, inverter, investigation

Korotkov V. A., Ananyev S. A., Shekurov A. V. � Investigation of cooling-rate effect on metal structure and mechanical properties at plasma hardenin

Investigation results of the cooling rate influence on the structure and mechanical properties of metal at plasma hardening are covered.
Key words: plasma hardening, cooling rate, thermal-cycle, heat flow

Khorunov V. F., Voronov V. V., Maximova S. V. � Investigation of the braze from the Ti�Zr�Co system

The structures of alloys of Ti�Zr�Co system in a wide range of concentrations were studied; as well the melting intervals of these alloys were determined. Characteristics brazed joints wetting, spreadability and strength in comparison with results which obtained by well-known filler metals are fixed. The structure and chemical heterogeneity of filler metals and brazed seams are investigated.
Key words: brazing, alloys of Ti, brazing alloy, wetting, mechanical properties

Gnyusov S. F., Durakov V. G. � Influence of titanium and tungsten carbides on structure formation and properties of composition coatings. Part 1: Structure-phase composition of coatings steel �6�5 � (WC + TiC)

Research results of structure-phase composition formation features of steel �6�5 � (WC + TiC) composition coatings depending on the content of tungsten monocarbide in the source mixture are described. It is established that the amount of the remanent austenite in the composition coating depends on the content of tungsten carbide in total volume of the input strengthening phase. Maximum amount of austenite (75 %) of the total volume of matrix has coatings in which carbide addition makes 20 %.
Key words: composition coatings, carbide addition, austenite, tungsten carbide

PRODUCTION SECTION

Tabakin Ye. M., Ivanovich Yu. V., Kaplin A. V. � Application practices of fusion welding when remote manufacture of nuclear reactor core products

This paper presents the results of work on developing techniques for remote-controlled welding of items containing radiation-hazardous products in hot cells and glove boxes. Here is given the description of equipment for remote-controlled laser and TIG welding units. The paper illustrates the use of developed techniques for core component manufacture and examinations of material behavior under different reactor operating conditions.
Key words: laser welding, remote-controlled conditions, ionizing radiation source, controlled-atmosphere welding

Isakayev E. Kh., Mordynsky V. B., Tyuftyaev A. S., Ilichev M. V., Katarzhis V. A. � Investigation of percussive plasma-powder surfacing on Hadfield steel

Superposition of the hammering over the plasma-powder coating is the result of further development of the method realized in this project in order to recovery railway frogs. Technological process data are discussed in detail, an influence of the impact energy over properties of layers are studied. The technology is promising for the hardening (recovery) of lengthy pieces due to the elimination of subsequent thermal treatment.
Key words: railway switch, plasma-powder coating, hammering, plasmatron

Strakh N. F., Metelitsa S. V. � Refacing of cast-iron parts by the method of wire ��-08�2� cold surfacing in different shielding gases

Degree of carbon burning in the pad at oxygen surfacing of cast iron is studied, as well as it is compared with low-carbon cold surfacing in widespread shielding gases under various surfacing conditions. It is shown that oxygen surfacing of an interlayer allows obtaining a plastic layer without preheating and using of special materials.
Key words: surfacing, protective coatings, filler wire, cast iron

Litovchenko N. N., Kulikov V. N., Titov N. V. � Graphite vibration surfacing of nanometalceramic composites

A description of the method of hardening of parts operating under conditions of abrasive wear dip-transfer surfacing nanometal-ceramic composite powder materials.
Key words: abrasive wear, hardening, nanometal-ceramics, graphite electrodes, sublimation

Volkov S. S. � Use of low-powered ultrasonic generators to weld products from polystyrene

The paper deals with improving the quality and strength of welded joints by ultrasonic welding of plastics through the use of low-power ultrasonic generators. The analysis of the performance of ultrasonic welding in the ferrite and nickel converters power 400 W. It is shown that to increase the performance of ultrasonic plastic welding and reduce electrical power ultrasonic generators must be designed with self-tuning to given amplitude of vibration of the waveguide.
Key words: generator, nickel, ferrite, ultrasound, transducer, power, amplitude, pressure, wave guide

ECONOMICS AND PRODUCTION ORGANIZATION

Tsumarev Yu. A. � Technical and economic efficiency of intermittent welds application

Issues of comparative resource intensiveness and loading capabilities of continuous and intermittent chain welds of T-joints are considered. It is shown that continuous welds of the same area of fracture have less resource intensiveness and higher load-carrying capability as compared to chain intermittent welds of T-joints.
Key words: fillet weld, intermittent welds, chain disposition of welds, stress concentration, amount of added metal

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