M. : MGSU, 2011. - 88 s. The manual provides information about the existing main methods of welding . Describes the main technological processes that occur during various welding methods, equipment and materials are given, the main advantages and disadvantages of each type of welding are considered Ways to increase the strength and weldability of welded joints, as well as their quality control . are considered. The basics of the theory of the formation of welding stresses and deformations and measures to reduce them. The basics of the technological process of manufacturing welded building metal structures are described .