Influence of processing gases in laser cladding based on simulation analysis and experimental tests

Abstract

Laser cladding is a multiphysical process based on thermal phenomena, powder micrometallurgy and fluid dynamics. The impact of process gases is usually overlooked in experimental studies, since when performing laser cladding on flat surfaces, it can be considered negligible. However cylindrical surfaces are more sensitive. In this study the influence of process gases on laser deposited coatings was investigated. The preliminary dependencies were determined with two-phase flow model describing the interaction of process gases with powder. It gave initial parameters range for performed experimental trials. Subsequently, obtained results were quantitatively characterized in terms of geometrical and material properties so as to formulate technological recommendations.