Real-Time Control of Direct Laser Deposition Process of Inconel 718 Using Laser Emission Spectroscopy

The gas-plasma plume generated during laser selective melting of various alloys was investigated using atomic emission spectroscopy. It was demonstrated that the type of protective gas used affects the spectral characteristics. The use of helium as a process gas compared to argon reduces overall luminescence and the contributions of individual elements to the spectrum, indicating lower losses of these elements through evaporation under laser radiation exposure.