This article contains results of the study of multilayer coatings produced by laser cladding on the substrate steel 34HMA using iron based powder PR-10R6M5 as the filler material. The coatings were produced with consistent application of the tracks with fixed overlapping. The dependencies between the characteristics of tracks and the technological mode of deposition were revealed. Properties of coatings were determined for various overlapping of tracks and directions of the cladding layers.

Main technological parameters of heat treatment of ferromagnetic alloy samples of special stainless steel were experimentally determined in order to create the paramagnetic zone of a given size there.

This work is devoted to the research of welding plume during high power ytterbium fiber laser welding of a titanium alloy in the Ar shielding gas environment. High speed video observation of a vapor-plasma plume for visualization of processes occurring at laser welding was carried out. The coefficient of the inverse Bremsstrahlung absorption of laser radiation is calculated for a plasma welding plume by results of spectrometer researches. The conclusion deals with the impact of plasma on a high-power fiber laser radiation.

The features of a laser cladding of nickel-based powders with TaC nanopowder additives have been experimentally investigated. The minimum depth of pro-melting of a basis, microhardness distribution over the cross section of the substrate, and the saturation of the metal of the cladding with basis components has been determined in the experiments.

Экспериментально исследованы особенности лазерной наплавки порошков на основе никеля с добавками нанопорошка TaC. В процессе экспериментов были определены минимальная глубина проплавления основы, распределение микротвердости по сечению подложки, насыщение металла наплавки компонентами основы.

The properties of the plasma that results from the laser welding of metals at various powers of the 10-kW ytterbium-doped fiber laser are experimentally studied. A projection system with an image intensifier based on a copper-vapor laser is employed for the direct observation of metal surface in the course of the laser welding in the presence of the high-intensity background illumination. A method for the shadow photographing is proposed for the analysis of the presence of metal vapor in plasma, since such vapor can lead to the reflection of the laser radiation in the course of welding.

The effect of the radiation of the pulsed fiber laser on the surfaces of cylindrical samples made of the VT16 titanium alloy is studied. It is demonstrated that the irradiation at appropriate parameters of the laser radiation in the inert-gas (argon) atmosphere leads to an increase in the microhardness of the surface layer and a decrease in the surface roughness of the irradiated samples by a factor of five in comparison with the roughness of the original samples.

The method allowing to detect in real time the laser radiation reflected from metal. in course of its processing by powerful fiber ytterbium lasers is proposed. it is shown that there is a correspondence between the behavior of a reflected back signal; and the oscillatory Processes in a liquid bath of the fused metal.GRAPHICS]Dependence of the number of peaks per unit time on the power of the incident radiation. (C) 2010 by Astro Ltd Published exclusively by WILEY-VCH Verlag GmbH & Co KGaA

A diode-pumped continuous-wave Nd:YAG laser with two linear and mutually orthogonal polarized components of radiation at a wavelength 0.532 μm is studied theoretically and experimentally. The cavity configuration for the realization of generation in this region is suggested. Stable lasing with two mutually orthogonal polarized components is implemented within the range of the intercomponent separation practically from zero to approximately 10 GHz.

The operation of the waveguide CO(2)-laser, with an intracavity C(2)H(4)-absorption cell, has been studied experimentally and theoretically, by the offset of the laser frequency from the absorption center. It has been shown that there exist up to three offset areas within which the laser regimes are different: stable lasing, unstable lasing, and no radiation. The dependence of the frequency range of the areas of the absorption gas pressure has been obtained.

Gaseous absorption of modulated infrared radiation can increase the temoerature of a gas. This is known as the optothermal (OT) effect /1/. A number of works devoted to OT registration of absorption spectra /2,3/ as well as to the study of OT detectors (OTD) basic characteristics and heat transfer me-chanisms /4,5/ have been published. These detectors are not large in size, are highly sensitive at low gas pressures (10−7cm−1 W Hz −1/2 in the present case) and have better vibrational immunity as compared to the ontoacoustic ones.