title: ÐÑÐ¾Ð±ÐµÐ½Ð½Ð¾ÑÑÐ¸ ÑÐµÐ¾ÑÐµÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¾Ð¿Ð¸ÑÐ°Ð½Ð¸Ñ ÐºÐ¸Ð½ÐµÑÐ¸ÐºÐ¸ Ð¿Ð»Ð°Ð·Ð¼ÐµÐ½Ð½Ð¾Ð³Ð¾ ÑÐ°ÐºÐµÐ»Ð° Ð¿ÑÐ¸ Ð»Ð°Ð·ÐµÑÐ½Ð¾Ð¹ ÑÐ²Ð°ÑÐºÐµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Features of a theoretical description of the kinetics of a plasma plume in laser welding
Creators: name: ÐÑÐ¸Ð¼Ð¾Ð²Ð°, ÐÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
Subjects: Ð»Ð°Ð·ÐµÑÐ½Ð°Ñ ÑÐ²Ð°ÑÐºÐ°
Ð¿Ð°ÑÐ¾Ð³Ð°Ð·Ð¾Ð²ÑÐ¹ ÐºÐ°Ð½Ð°Ð»
Ð¿Ð»Ð°Ð·Ð¼Ð°
Ð¿Ð»Ð°Ð·Ð¼ÐµÐ½Ð½ÑÐ¹ ÑÐ°ÐºÐµÐ»
ÑÐ¼ÐµÑÑ Ð³Ð°Ð·Ð¾Ð²
Ð³Ð¸Ð´ÑÐ¾Ð´Ð¸Ð½Ð°Ð¼Ð¸ÑÐµÑÐºÐ¸Ðµ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ñ
ÐºÐ¸Ð½ÐµÑÐ¸ÑÐµÑÐºÐ¾Ðµ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ðµ
laser welding
keyhole
plasma
plasma plume
gas mixture
hydrodynamic equations
kinetic equation

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description: This work is devoted to the study of theoretical approaches used in the description of the plasma plume formed during laser and laser-arc welding. Based on a number of scientific papers, an analysis of numerical and analytical approaches to the description of the plasma plume was carried out. It was found that the dynamics of a gas mixture of metal vapor and shielding gas is described by a system of hydrodynamic equations: the continuity equation, the general dynamic equation of motion of a viscous fluid, the diffusion equation, and the general heat transfer equation. In this case, a number of approximations can be used: the approximation of the boundary layer, the approximation of the laminar gas flow, the absence of thermal and barodiffusion, the axial symmetry of the key-hole, etc. To describe the plasma, we used a modified kinetic equation for the energy spectrum of electrons, which implies the absence of local thermodynamic equilibrium. The using the Van der Waals equation as a coupling equation in a system of hydrodynamic equations written in the approximation of axial symmetry of the boundary layer to obtain more accurate results was proposed.