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This monograph presents basic theoretical and applied issues of the process of electron beam heat treatment, cladding and welding in various industries. Reviewed hardware and technological aspects, peculiarities of formation of structure of metals and alloys, as well as the patterns of change of such physical-mechanical properties, such as hardness, wear resistance, corrosion resistance, thermal conductivity. The specific examples of the electron beam to create a strengthening and protective coatings. Can be recommended as a textbook for students of technical universities, engineers and researchers and practical workers in the field of welding production.