Why metals join in welding

Welding is the technological process of obtaining one-piece joints by establishing interatomic bonds between the parts to be welded during their local or general heating, or plastic deformation, or the combined action of both.
Welded metal characterizes the continuity of structures. To obtain a welded joint, it is necessary to carry out intermolecular adhesion between the parts to be welded, which leads to the establishment of an atomic bond in the boundary layer.

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