Melt Pool Temperature Control in Laser Additive Process

The possibility of obtaining real-time information about the thermodynamic state of the molten metal pool created during additive layer-by-layer deposition of powder material on a substrate surface by laser directed energy deposition (LDED) technique is considered. Current information about the thermodynamic temperature of the molten metal material is important for obtaining predictable properties of parts manufactured using laser-based additive technologies. As a result of the studies carried out, the existence of a linear dependence of the intensity of light radiation from the melt pool in the spectral range (280–380 nm) on the power density of laser radiation has been found. This linear dependence allows to obtain further information about the quality of the LDED process. The obtained scientific and technical solutions for the melt pool temperature control can be used to improve the precision control in laser additive manufacturing of metal parts with stringent quality requirements. Along with this, the results obtained in the work will be used to improve the information base of the decision support system being developed by the team of authors for process engineers of laser robotic equipment.