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Grigor’yants A. G. – Scientific school at the "Laser technologies in machine-building" department of the Bauman MSTU

Essential stages of the the "Laser technologies in machine-building" department development in Bauman MSTU are covered. Over the 30 years passed since the establishment of the department a great volume of scientific research and educative methodological work has been done, which came to be the base of the modern scientific and educational complex. During the recent years a considerable attention has been paid to development and upgrading scientific basis for carrying out research work meeting high modern standards. This is the basis of highly skilled engineers, holder of a master's degree, candidates and doctors of technical sciences, who develop the “Russian method” of personnel training, the method brought about in the university many years ago.
Key words: centre creation, engineering skills training, fundamental work

STRUCTURAL MATERIALS, METAL SCIENCE

Panchenko V. Ya., Vasiltsov V. V., Grezev A. N., Galushkin M. G., Yegorov E. N., Il’ichiov I. N., Misyurov A. I., Pavlov M. N., Soloviov A. V. – Metallic powder laser sintering to manufacture engineering products with gradient properties

Results of metal powders selective laser sintering technology application to manufacture products with axial symmetry are covered. Pilot production laser jet created on the base of high-power industrial CO2-laser and manipulator five-axis bench is described. Metallographic analysis of the obtained products verified generation of composite structures with high service properties.
Key words: laser, laser technology, selective laser sintering

Novichenko D. Yu., Grigor’yants A. G., Smurov I. Yu. – Fabrication of composite materials with metal matrix by direct laser deposition

Application of powder materials on the base of steel and titanium carbide is considered. A correlation analysis-based laser deposition process chart for rollers and lays with required data is formed. Conditions for obtaining composite materials of different patterns with titanium carbide particles both retained in matrix and dissolved, as well as with fine-dispersed strengthening particles separation are determined.
Key words: additive industrial process, direct laser deposition of material, laser surfacing, metal matrix, titanium carbide

BLANK PRODUCTION

Grigor’yants A. G., Misyurov A. I., Tretyakov R. S. – Analysis of the coaxial laser surface coating condition influence on the bead formation

It is established that one can efficiently control deposited bead dimensions, form factor and dispersion coefficient by changing conditions of coaxial laser surfacing. Increase of the bead dimensions depends on the laser altering power, at the same time starting from certain values a stabilization of form factor and dispersion coefficient take place.
Key words: laser surfacing, process characteristic, non-production beads, corrosion-resistant steel

Misyurov A. I. – Restoration of the components from nickel-based high-temperature alloys by laser pulse-periodic radiation

Issues of structure formation at laser repair surfacing of the components from nickel-based high-temperature alloys are considered. It is shown that usage of the pulse-periodic radiation allows for significant reduction of the heat-affected area spread. High cooling rate results in primary structure refining of the molten area and offer the challenge for efficient control of its composition.
Key words: components, nickel alloys, laser pulse-periodic radiation, structure

TECHNOLOGIES AND EQUIPMENT FOR MACHINING, PHYSICOTECHNICAL PROCESSING, NON-CUTTING SHAPING

Bogdanova M. A., Kurilov M. V., Yamalitdinov D. D., Golubenko Yu. V. – Sapphire crystals fracture under the influence of laser emission

Research results of the laser emission and sapphire substrate interaction are covered. Mechanism of laser-induced damage is considered.
Key words: laser, laser radiation, leucosapphire, crystal, theory of failure, sapphire

Melyukov D. V., Grigor’yants A. G. – Technology of film controllable laser treatment

It is shown that controllable film treatment may be conducted completely by contact method, combining laser ablation with heat diagnostics, therefore increasing film treatment accuracy.
Key words: laser ablation, heat diagnostics, film treatment

TOOLING PRODUCTION

Bogdanov A. V. – Manufacturing capability assessment features of industrial lasers

Optimal conditions assessment features of the laser systems’ operation to conduct different processes of material working are covered. Functional dependencies of material processing depth, width and speed on average power, laser beam intensity divergence angle, dot size on the resonator output window and the properties of the focusing optical system are plotted. A multifactor mathematical model is developed, which may serve as a working algorithm of the control and operation system of the laser industrial installation.
Key words: industrial lasers, materials processing, multifactor mathematical model

WELDING, RELATED PROCESSES AND TECHNOLOGY

Grigor’yants A. G., Grezev A. N., Misyurov A. I., Grezev N. V. – Prospect of heavy gage welding practices on the base of laser beams composition

Issues of the laser welding effectiveness increase for the heavy gage products from hardened steel are covered. Two or more laser beams partnering enables productivity improvement of the process, lowering of requirements for assembling accuracy of the welded workpieces, as well as cooling rate control in the temperature range of phase and structural transformations. At the same time higher level of mechanical strength is achieved as compared to single-beam and arc welding.
Key words: laser welding, arc welding, phase and structural transformation, mechanical strength

Grigor’yants A. G., Grezev A. N. – Interface widened gap laser welding of pipe and shipbuilding steels

A possibility of weld properties control when increasing inlaying laser power and welding rate is shown.
Key words: laser welding, pipe and shipbuilding steels, weld, welding rate

Fiodorov B. M., Misyurov A. I. – Influence of laser welding data on nickel welded strength

Welds reliability of heatproof nickel alloys as a result of doping level limitation and carrying out operations of quenching and aging is considered.
Key words: laser welding, strength, nickel alloy

Afanasyeva L. Ye., Barabonova I. A., Zorenko P. O., Yakovlev I. A., Grezev A. N., Grezev N. V., Grechishkin R. M. – Impact of external electric and magnetic fields on laser welding

Possibilities of non-contact control of laser processing with the aid of external electric and magnetic fields are considered. Schemes of coupling the field sources with laser technological installations are given. Experimental results on the effect of external fields on laser welding of carbon and stainless steel are presented.
Key words: laser processing, avalanche ionization, plasma torch, welding depth, influence of external fields

Shiganov I. N., Kholopov A. A. – Aluminum alloys laser processing effectiveness increase

In order to ensure the best operation rate, power saving and quality of aluminum alloys processing it is advised to conduct welding with filler wire, use compound fluxes, as well as apply fiber laser as an emission source.
Key words: effectiveness, flux, fiber laser, filler wire

SPECIAL TECHNOLOGIES

Grigor’yants A. G., Smirnova N. A. – Steel and aluminum casting alloy surface strengthening by fiber laser radiation

Metallographic examination results of the samples from steel 45 and aluminum casting alloy AK9 hardened by radiation of CO2-, solid-state and fibre lasers are given.
Key words: heat treatment, surface, aluminum alloy, steel, structure, conditions, properties, effectiveness

Malov I. Ye., Shiganov I. N. – Acrylic photopolymeric composition for laser stereolithography

Advantages and disadvantages characteristic of the photopolymeric compositions on the base of multipurpose methacrylic esters are considered with regard to polymeric articles production by the laser stereolithography method.
Key words: laser stereolithography, polymeric models, structure quality

Grigor’yants A. G., Misyurov A. I., Makarov V. V. – Nano-dimensional thin film vacuum formation technique

Vacuum methods of forming quantum-dimensional nano-structures are analyzed. The most common techniques, features, schematic circuit, thin film formation conditions are considered, specifically a laser vapor phase deposition method advantaged as compared to other ones.
Key words: laser ablation, epitaxy, nano-structure

TESTING AND DIAGNOSTICS METHODS IN ENGINEERING INDUSTRY

Kurochkin I. Ye., Korotayeva M. A., Pyrikova S. I., Shiganov I. N., Grigor’yants A. G. – Laser rapid analysis of the liquid medium composition

An application of optoelectronic and laser devices for determining composition of liquid medium, such as foodstuffs, drugs, water is considered. A milk and dairy foods quality testing apparatus, namely for controlling fat and proteins, degree of milk attenuation with water is described.
Key words: laser, photometry, nephelometry, fluorescence, milk

Shiganov I. N., Melnikov D. M. – Determination of diesel fuel low-temperature properties by rapid analysis of hydrocarbon oils

A rapid analysis technique of determining freezing and cloudiness temperatures for summer and winter diesel fuel is described. Chemical structure estimation procedure of the diesel fuel wax fraction is suggested. It is based on the principle of scanning colorimetry of specular reflection.
Key words: rapid analysis, petroleum products, construction, measurement, crystallization, cloud, fluidity, alkanes

PROCESSES AND PRODUCTION AUTOMATION AND CONTROL, CAD SYSTEMS

Grigor’yants A. G., Shiganov I. N., Melnikov D. M. – The Fazafot hardware-software complex for end-use test of hydrocarbon oils and solid petroleum products

A hardware-software complex for testing physicochemical (working) properties of fuel oil and engine oil is described. It combines two approaches to optical analysis of liquid and solid, turbid, semitransparent and dark medium: turbidimetry at 18...20 °C and temperature scanning photo colorimetry.
Key words: rapid analysis of petroleum products, cloud point, solidification, fluidity, alkanes, oils, diesel fuel

PRODUCTION ORGANIZATION

Grigor’yants A. G., Tretyakov R. S. – Moscow centre for laser technologies

Objective and subjective problems of domestic laser optical industry development are shown.
Key words: laser technology centre, technology check-out, refresher training of personnel

Saprykin D. L. – Laser technologies for modernization

Foreign and domestic markets of laser industrial equipment are analysed. It is shown that by the end of crisis laser industry of Russia goes over to a new phase and is ready for considerable structural innovations.
Key words: high-technology company, market, innovation, laser technologies

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