Abstract
In this study, a classification of welding methods is proposed, based on the peculiarities of metal gripping under various heat-deformation conditions for the implementation of welding processes. The theoretical basis of the developed classification is the hypothesis of the critical sizes of active centers. The main approaches to the classification of welding methods are considered, and four groups of pressure welding methods are proposed, depending on the mechanism of formation of stable centres of gripping: mechanical welding methods with low plastic deformation rate; mechanical methods of welding with a high plastic deformation rate; thermo-mechanical welding methods, in which, in addition to heating by deformation, additional sources of thermal energy are used to increase the temperature in the zone of joint formation; thermal pressure welding methods that envisage only a thermal activation channel.
Highlights
A large number of different pressure welding methods are used in the industry [14]
The classification we propose is based on the peculiarities of metal gripping under various heat-deformation conditions for the implementation of welding processes
The described welding conditions correspond to the thermo-mechanical class, the energy and density of crystal lattice defects does not determine the fundamental possibility of metals centres of gripping in the plane of their contact
Summary
A large number of different pressure welding methods are used in the industry [14]. The mechanical class includes cold welding, friction welding and explosion welding This approach makes it possible to systematize the features of external influence on the connected volumes of metals, but does not say anything about the mechanism and nature of the formation of a welded joint. The classification of pressure welding methods according to the features of the applied compressive force is proposed in [6, 7] In this connection, the following groups of welding methods have been proposed: with low-intensity, medium-intensity and high-intensity force impact. The following groups of welding methods have been proposed: with low-intensity, medium-intensity and high-intensity force impact This classification does not fully reflect the features of the mechanisms of formation of a.
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