Within the context of additive manufacturing techniques, the powder bed fusion with electron beam (PBF-EB) process is characterized by its distinctive preheating phase. The diffusive phenomena at the atomic level triggered by the heat generated within the preheating step result in solid connections between powder particles. These material bridges, better known as sintering necks, assume a central role in the feasibility of the PBF-EB process, since they prevent the unsafe smoke phenomenon and control thermal and electrical conductivities. The neck growth, and in general the overall preheating step, is commonly optimized by a manual “trial-and-error” procedure although this is known to be wasteful in time, energy and raw material.