This chapter describes the development of some welding and surfacing technologies with an account for the surface phenomena by an example of specific parts and some welding and surfacing methods, as well as conditions, under which the processes occur. Composite fiber-reinforced materials find an increasingly wide application recently, especially in aircraft and transport engineering. The processes of wetting and spreading of the melts occurring during welding of conventional metals are of a very complicated nature. The presence of large heterogeneous regions leads to the formation of additional energy barriers between them and, thus, the state of a metastable equilibrium. Electron beam surfacing using traditional standard units with vacuum chambers has a limited commercial application. The sag of the weld surface decreases with increase of the welding speed from 0.0028 m/s to 0.0166 m/s due to deterioration of spreading of bronze over the iron surface.