SCIENTIFIC-TECHNICAL SECTION

Rymkevich A. I., Potapov N. N., Roschin M. B. — Effect of the flux chemical activity on the added metal properties at electroslag welding and electroslag remelting

It has been studied how flux’s chemical activism influences on properties of melted metal Mn—Ni—Mo—V steels, produced by methods of electroslag welding and overmeiting. It was demonstrated, that with increasing chemical activism of flux by enlarging the share of silica in it until 16—24 % (flax ФЦ-21), in the remelted metal increases the share of easily deformable nonmetallic oxide inclusions and rises the share of zones with reduced hardness in it’s structure. It brings the increasing of plasticity and strain capability during the relaxation process of welding stresses, provides of required mechanical properties of welded joints after final heat treatment and obviates danger of cracks through reheating in the welded joints performed by electroslag weld.
Key words: electroslag welding and overmeiting, chemical activism of flux, cracks through reheating, structure and mechanical properties

Kovtunov A. I., Myamin S. V., Chermashentseva T. V. — Study of the steel wetting processes by aluminium at layered composites making

It is established that high values of the steel wetting force by aluminium at layered composites formation by liquid-phase impregnation are observed at surface activation by the fluxes based on the eutectic of the KF—AlF3 system and on K2TiF6, K2ZrF6. At the same time aluminium-steel cohesive resistance depends on the activating flux composition and on the formation process temperature.
Key words: wetting, steel, aluminium, composites, adhesive strength

Kondratyev S. Yu., Gorynin V. I., Popov V. O. — Face-hardened layer parameters optimization at laser quenching of components

A quantitative assessment possibility of the maximum allowed depth of a member laser-strengthened surface layer of specified working thickness conserving necessary service reliability of the construction is considered. Structure and mechanical properties of steel 40Х, bronze Бр АЖНМц 9-4-4-1 and titanium alloy 3M after laser surface strengthening under variable conditions are studied.
Key words: laser processing of metals, surface hardening, mechanical properties, alloy microstructure, serviceability of structure, functionability of friction pairs

Scherbakov A. V., Goncharov A. L., Sliva A. P., Ryzhkin R. A. — Special features of using mathematical model approach to determine process-dependent parameters of electron-beam welding

Mathematical model of process of the electron beam welding based on the decision of a nonlinear Stephan problem by the method of finite differences is resulted. The original adaptive algorithm allowing at designing of an operating conditions of equipment under set characteristics of a welded seam and speed of welding in a dialogue mode is offered to define demanded power of an electron beam and a focusing level.
Key words: electron beam welding, mathematical model, welding technological parameters

Maximova S. V., Khorunov V. F., Ivanchenko V. G. — Brazing of the intermetallid alloy 48-2-2 by the brazing alloy of the Ti—Zr—Mn-system

Research results of the alloys of the Ti—Zr—Mn-system are given. Expediency of these alloys as solders for high-temperature vacuum brazing intermetalhd titanium alloy 48-2-2 is shown. Morphological features of the brazed seams structure formation are considered.
Key words: vacuum soldering, brazing alloy, titanium intermetallid alloy, structure, brazed seam, fillet area

PRODUCTION SECTION

Kurmachev Yu. F., Novoseltsev Yu. G., Demchenko A. I., Shmarlovsky A. N. — Constant welding rate supply at machine welding of the closed seams of irregular shapes

Equations are obtained to determine necessary angular rotational velocity of a product aimed at supplying constant welding rate at welded parts production. These equations allow creating a base for program design of machine welding of the closed seams of irregular shapes.
Key words: machine welding, welding rate, angular rate determination

Gueykin V. A., Martyshin G. V., Sharonova N. I., Frolov V. S. — On the weld bead displacement at labyrinth seals repair by nonconsumable gas-shielded surfacing

A characteristic defect formation is established, i. e. weld bead misalignment from the axis of the labyrinth seal comb at its repair by nonconsumable gas-shielded surfacing. Deflection origin causes are considered using experimental and calculation research methods. Clearing techniques are specified.
Key words: weld bead, nonconsumable electrode, deflection, labyrinth seal

Guryev S. V., Pletniov Yu. M., Muravyov I. I. — Property study of the welds obtained by mixed-gas submerged-arc welding

Mechanical test results of the T3-type welded joints from low-alloy steel obtained by machine mixed-gas submerged-arc welding using AH-348A flux are covered.
Key words: machine welding, shielded mixed gas, flux, welded joints

Volobuyev Yu. S., Volobuyev O. S., Parkhomenko A. G., Dobrolezha Ye. I., Klimenchook O. S. — Application of the new ceramic general-purpose flux COM-101 at welded beams fabrication

A composition of new ceramic general-purpose flux is developed to weld carbon steel. The flux is not inclined to hydration, has low relative chemical activity with respect to deposited metal, ensures minimal oxidation of the alloying componentry and spontaneous separation of the slag crust immediately as-welded, that does not need carrying out laborious work of dross removal from the surface of a weld. The flux ensures smooth fusion with the edges of the welded parts and absence of prohibitive defects in the weld metal.
Key words: ceramic flux, welding, smooth fusion, solidified slag, weld seam

Gulakov S. V., Burlaka V. V. — Electrode oscillation device of a welding deposition unit

A drive construction of an electrode travel for deposit welding of machinery and tools working surfaces by beads of irregular shape is given. The drive gear is carried out as a modification of a crank gear in which the length of the connecting rod may be automatically adjusted by special linear drive unit of the screw-and-nut type adhering to the subsidiary drive power minimum condition.
Key words: welding deposition, electrode, drive, automatic control system

Kouznechik O. O., Belyavin K. Ye., Sarayev Yu. N. — Adaptive control of the self-fluxing prealloyed powder electrocontact surfacing

Adaptive control system function chart and capability are covered. The system ensures thermal behaviour stabilization and duration optimization of the electrocontact surfacing. By the example of powder electrocontact surfacing of the self-fluxing alloys ПР-Х4Г2Р4С2Ф and ПГ-CP4 it is shown that usage of such system during the coating process favours added material structure stabilization, its higher wear-resistance and reduces crazing occurrence probability in it.
Key words: electrocontact surfacing, adaptive control, powder, coating

ECONOMICS AND PRODUCTION ORGANIZATION

Sergeyev A. A. — Competitiveness of the engineering industry enterprises during a crisis

The author analyzes the principal causes of competitiveness decrease of mechanical engineering products during the crisis and underlines the importance of investments for development of innovations. In the article emphasis is placed on the weakening pace of development of mechanical engineering in comparison with a growth rate of extraction of raw materials. The author draws attention to the structure of the Russian economy and caused distortions in the development of industries, identifies the main ways of improving the competitiveness of the industry based on conversion of mechanical, engineering in a competitive, hi-tech and receptive to innovations complex.
Key words: mechanical engineering, competitiveness, investments, conversion of mechanical engineering, development, extraction of raw materials, decrease in production

EDUCATION & PERSONNEL TRAINING

Yablonskikh Ye. K. — On the issue of training personnel for machine-building industry

Problem of training personnel of all levels for machine-building is considered. Necessity of updating the whole educational system is noted. Regulatory and legal support of the problem is given.
Key words: machine-building, personnel training, modernization

INFORMATION

Suslov An. A., Dobrinsky Ye. S. — The 2nd Show "Industrial robots and robot-technological complexes"

BIBLIOGRAPHY

Contents of the foreign journals on welding

RF patents for the inventions in the field of welding

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