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Today we will discuss about welding and types of welding. Welding is the process of joining similar metals by application of heat with or without application of pressure and addition of filler material. It is used as permanent fasteners. In the every metal industry welding is used widely. In fact, the future of any new metal may depend on how far it would lend itself to fabrication by welding.

The weldability has been defined as the capacity of being welded into inseparable joints having specified properties such as definite weld strength proper structure. The weldability of any metal depends on five major factors. These are melting point, thermal conductivity, thermal expansion, surface condition, and change in microstructure