ENERGY-BEAM REDISTRIBUTION AND ABSORPTION IN A DRILLING OR WELDING CAVITY

Energy redistributed and absorbed in the cavity produced by a high-intensity bearn during drilling and welding is systematically and quantitatively investigated. The incident energy flux is assumed to be a realistic Gaussian distribution, and the cavity is idealized by a paraboloid of revolution having both specular and diffuse reflectivities. By using a Monte Carlo method, the results show that the energy absorbed by the cavity wall deviates markedly from the Gaussian distribution. Effects of the cavity depth-to-opening radius ratio, absorptivity, and specular reflectivity on the absorbed energy are presented. A comparison of incident energy fluxes of uniform and Gaussian distributions is also made.