Laser welding is being used more frequently in industrial processes because of its advantages; therefore, energy loss in welding is an important issue during planning and operation. We calculated the energy losses expected during the laser welding of TA6V titanium alloy. We used the heat equation to describe the energy distribution of solid and liquid TA6V. The solid-to-liquid phase change was taken into account by comparing the accumulated energies and enthalpy of fusion. A numerical model was used to calculate the energy lost by convection and radiation. Finite difference calculations were performed using a FORTRAN-based computer program to solve the heat equation. The numerical results suggested that the appropriate laser welding velocity and power were in good agreement with the experimental data published elsewhere in the literature. The results showed the importance of the influence of the energy lost by radiation and convection in the welding area on welding energies and temperatures.
Ce travail présente une simulation par la méthode de Monte Carlo (SMC) des réactions chimiques qui se produisent dans le volume d'un réacteur PECVD lors de déposition d'une couche mince a-C: H élaboré à partir d'un mélange gazeux (CH 4 /H 2). En plus de CH 4 et H 2 , les molécules et les radicaux considérés dans l'étude sont CH 3 , CH 2 , CH, C 2 H 5 , C 2 H 6 et H. La SMC se base sur les collisions binaires. La SMC nous a permis d'obtenir les densités et les fractions molaires des particules ainsi que d'autres paramètres liés aux vitesses de réactions. Les résultats sont en bon accord avec d'autres travaux.
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