The processes of ironmaking, steel, coloured metals and their alloys are described. Connection is exposed between a structure and properties of materials, bases of theory of alloys are expounded, given description of different types of сталей and alloys, and also technology of their treatment.Basic part of book is sanctified to the welding (essence, classification, physical and chemical processes, deformations and tensions, свариваемость of metals) theory. Devices over are brought, an equipment and apparatus for the different types of welding and наплавки| are considered receptions of implementation of the different weld-fabricated guy-sutures. Information is given about welding materials, modern equipment, the features of technology of welding of different metals and alloys are shown. The defects of the weld-fabricated connections, methods of their warning, control and removal, are considered. The questions of accident prevention are expounded.For the students of institutions of higher learning, student on to direction of preparation of graduate specialists "Mountain business" and on speciality "Mountain machines and complexes" of direction of preparation of graduate specialists the "Technological machines and equipment".