Transient heat conduction in solids irradiated by a moving heat source with combined donut and gaussian distributions

In this paper a three dimensional conductive field in a semi-infinite solid with finite thickness and width heated by a moving laser source is numerically studied. In the numerical model convective heat losses through the surface are taking into account. Thermal properties are considered temperature dependent and the materials are considered isotropic. The considered laser source is a linear combination of Gaussian and donut distribution and it moves with a constant velocity along motion direction. The simulation model is solved by means of the COMSOL Multiphysics code. Results in terms of temperature profiles as a function of time are given for Peclet equal to 0.1, 0.5 and 1.0 and several Biot number values. Three heat source distributions are examined Gaussian, donut and a donut-Gaussian. It is observed that different behaviours are detected between the Gaussian and donut distributions whereas the combined donut-Gaussian and Gaussian distributions present similar qualitative. © 2010 Praise Worthy Prize S.r.l. All rights reserved