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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�01 2017)
to russian

SCIENTIFIC-TECHNICAL SECTION

Shchetinin S. V. � Electromagnetic nature of the molten metal flow in the welding bath

Electromagnetic nature of the molten metal movement in the welding bath is indicated. The molten metal movement speed increases at increasing the welding speed when welding from current supply and sharply increases when welding to current supply due to the reduction of the magnetic field induction behind, the increase of the directed back electromagnetic force and reduce the arc spot size, which confirms the electromagnetic nature of the undercuting formation.
A method for high speed indirect welding by composite electrode is developed. This method provides an increase of the active arc spot size, forward movement of the arc and the bath molten metal, decrease of the electromagnetic forces directed downward in the region of the bath side edges, qualitative formation of seams without undercutings and a reverse roller on the melt backing and increase impact toughness of the welded joints.
Key words: molten metall of the welding bath, electromagnetic force, undercutings, high-speed indirect welding, composite electrode, impact toughness

Parshin S. G. � MIG-welding research of steel S235JR at the introduction of gas sulfur hexafluoride SF6 in argon

In the article the research results of MIG-welding of the steel S235JR with G4Si1 wire at introduction of gaseous sulfur hexafluoride SF6 in argon at a concentration of 1,6 to 6,4 % are adduced.
The aim of the work was to study the influence of sulfur hexafluoride SF6 on the parameters of a metal drop transfer and the welding joint formation at automatic MIG-welding in an argon environment.
When introducing sulfur hexafluoride SF6 in argon a change in electrode melting process occurses, the efficiency of heat input improves. Drop transfer frequency increases to 1,87...1,95 times, the fusion penetration is increased to 30...70 %, and the seam width is reduced up to 25...35 %. Introduction of sulfur hexafluoride SF6 provide the growth of the average value of the welding current, the decrease of the current arc voltage amplitude declination.
Key words: apron, sulfur hexafluoride, dropping metal transfer, welding joint forming, heat input

Polyakov A. Yu., Furmanov S. M., Bendik T. I., Kurlenkov A. M. � The development of energy-efficient way for the contact projection welding of the packet connections

A high-performance energy-efficient method of the joining contact projection welding in one cycle of 3�4 parts is developed. The method is based on the automatically adjusted stage-by-stage input of electrical energy in the electrode area.
Key words: contact projection welding, pacet joining, the inter-electrode area resistance, technological similarity criterion, joining formation kinetics, electric energy, multistage current pulse, welding process control

Dobronosov Yu. K., Gavrish P. A. � The research of the metal stress-strain and kinematic state during rolling of the copper to steel welding joint

The work is devoted to the complex research of the stress-strain and kinematic state characteristics of the welding joint metal during rolling copper to steel welding joint. Mathematical modeling of the welding joint geometrical parameters is carried out; characteristic fields into the physical plane and the speeds plane locus plane at welding joints rolling are constructed; the basic laws of the stress-strain state formation mechanism for the metal of the rolled copper to steel welding joint are revealed.
Key words: welding copper to steel, the deformation degree, welding joint reinforcement, mathematical model, speed locus, slip field

Akhunova A. Kh., Dmitriev S. V., Valitova E. V., Valitov V. A. � Pressure welding of the dissimilar heat-resistant alloys, the influence modeling of the sample geometric parameters on the of plastic deformation localization in pressure welding zone

This paper studies the possibility of increasing the junction quality of dissimilarhe at resistant materials by welding pressure in the presence of the relief on one of the work piece by using computer modelling. It is shown that weld quality depends on the geometry of the sample.
Key words: pressure welding, finite element analysis, welded surface relief, sample geometry

PRODUCTION SECTION

Kovtunov A. I., Plakhotny D. I., Bochkarev A. G. � Utilization features of the iron-aluminum alloys system for welding deposit of metal moulding permanent foundry coatings

The influence of dual-arc surfacing conditions on weld deposit chemistry was investigated for process using aluminum and steel filling wires. Influence of chemistry on mechanical and working properties of weld pad was studied and performance of intermetallic alloys Fe-Al in the capacity of permanent protective coating of casting mold was demonstrated.
Key words: Twin-arc welding, metal form, intermetallic iron-aluminum, heat resistance, wear resistance, welding modes, the chemical composition

Ilushchcenko A. F., Manoylo E. D., Andreev M. A., Onashchenko F. E. � Gas flame coating from self-fluxing alloys � new opportunities

After analyzing advantages and disadvantages of existing flame coating methods using self-fluxing alloys we have developed a new process of continuous flame coating (CFC) and instruments for its implementation. In accordance with the process, heating of the substrate, application of a coating layer and its melting are carried out by an increased power device. There are no interruptions between operations; therefore we can significantly expand technological capabilities in recondition and hardening of parts for various applications.
Key words: flame coating, self-fluxing alloys, recondition and hardening of parts

ECONOMIC AND PRODUCTION ORGANIZATION

Zenkovich M. V., Drevs Yu. G. � The efficiency improving of decision-making at the investment projects valuation for the creation and modernization of the machine-building enterprises shops

The methods and software to evaluate the effectiveness and carry out comparison of alternative projects for machine-building enterprice shops are considered. The efficiency valuation task is formulated in terms of decision-making theory. The presented approach is based on the use of simulation modelling for valuation the technological and design solutions used to design considered machine-building enterprice. Arguments in favor of the application of this approach are adduced. The use of the proposed approach is considered on the example of the modernization project of the machine-building enterprice foundry.
Key words: decision-making support, effisiency valuation of investment projects, simulation modelling, production system

INFORMATION

Suslov An. A. � 16th International specialized exhibition of welding materials, equipment and technologies "Weldex/Rossvarka � 2016"

Volkova N. N., Panin V. N., Mullin A. V. � Strategy of the International Institute of Welding (IW) for the development of welding production

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