Welding is a technological process, as a result of which a permanent joint of billets made of metals or their alloys is obtained through the establishment of close connections between the parts being welded. Such bonds are established at the interatomic and intermolecular level due to local or general heating, or plastic deformation, or the combined action of both of these factors. Various sources of energy can be involved in the welding process: electric current, electric arc, gas flame and others. Thanks to the development of technology, today it is possible to perform welding both in standard conditions of industrial enterprises, and in field and installation conditions, under water, and even in outer space.
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