The article looks into the influence of energy and optical factors on the quality of laser cutting of thick sheet metal. The authors describe the advantages of using laser cutting in production and determine further directions in the development of laser technology. The work presents an analysis of Russian and foreign scientific research and highlights the indicators that affect the quality of manufacturing parts by laser cutting. The authors present the results of an experimental study of the influence of energy and optical factors and finding dependencies in order to determine the optimal technological modes for obtaining a high quality cut. The studies and experiments carried out made it possible to determine the optimal ratio between the focal spot diameter and the waist length when using lenses with focal lengths of 200, 250, and 300 mm. Based on the data obtained, the authors also formulated technical requirements for the development of a model of a laser optical head.

Keywords: laser cutting, radiation power, optical factor, parameters, laser head, experimental study

The article analyzes the influence of the roughness and thermal conductivity of the processed steel on the choice of gas laser cutting parameters. The authors describe the possibilities and advantages of using gas laser cutting in production. The article presents the results of an experimental study of samples made of St3 steel of various thicknesses. An analysis of the data obtained showed that with an increase in the gas laser cutting speed, the roughness parameter increases, and the laser power has practically no effect on the roughness value. The authors also attempt to take into account the influence of the thermal conductivity of the processed material on the choice of laser cutting characteristics. It was found that in order to ensure a minimum roughness for steels with higher thermal conductivity, increased power and cutting speed should be used.

Keywords: gas laser cutting, roughness, thermal conductivity, parameters, mathematical models, experimental study

The article describes the design of an experimental equipment (sample) for determining the cohesive strength of powder coatings in inactive and aggressive environments. A method for determining the mechanical characteristics of samples with coatings is presented, as well as data from the results of testing the cohesive strength of coatings based on nickel, PN60Y40, PN40Y60, iron-aluminum, coatings of self-fluxing alloys based on nickel PGSR-2, PGSR-3, PGSR-4.

Keywords: experimental equipment, cohesive strength, gas-thermal powder coatings, physical and mechanical properties, plasma spraying