In general, welding is the process of joining, together pieces of metals or metallic parts by bringing them into intimate proximity and heating the places of contact to a state of fusion or plasticity.
Welding makes it possible to reconstitute metallic continuity between the components to be assembled.
Theoretically, it involves bringing the surfaces to be linked closer so that the surface atoms are at a distance of the order of the inter-nodal distances of their own crystalline system. This is practically impossible to achieve due to obstructions and practical constraints. Hence artificial activation of mating surfaces is required.
Welding may be done with or without direct application of heat and/or application of mechanical force as per combinations listed below
Welding makes it possible to reconstitute metallic continuity between the components to be assembled.
Theoretically, it involves bringing the surfaces to be linked closer so that the surface atoms are at a distance of the order of the inter-nodal distances of their own crystalline system. This is practically impossible to achieve due to obstructions and practical constraints. Hence artificial activation of mating surfaces is required.
Welding may be done with or without direct application of heat and/or application of mechanical force as per combinations listed below
- processes utilizing the fusion without mechanical action;
- processes utilizing the fusion combined with mechanical action;
- processes utilizing heating without fusion but with a mechanical action;
- processes utilizing a mechanical action without heating.
