Additive Manufacturing (AM) is one of the most interesting class of technologies in the industrial environment that has been considered a fundamental part of Industry 4.0. There are several types of AM, but in this thesis, we will focus on Directed Energy Deposition (DED), which is a material feed metal AM process and has several promising applications in the Aerospace sector. The goal of this thesis was to analyse different kinds of Inconel 718 samples produced via the DED process in order to define the optimum set of process parameters to produce or repair the defect-free IN718 parts. The analysed samples are of three different types: 36 “Single Scan Tracks” (SSTs), 12 “Single Layers” (SLs), and 2 “Cubes”.