During ‘Bronze Age’ parts were joined by forge welding to produce tools, weapons, and ornaments, etc, however, present - day welding processes have been developed within about a century. If no filter metal is used during welding then it is termed as ‘Autogenously Welding Process’. Heat may be obtained by chemical reaction, electric arc, electrical resistance, frictional heat, sound, and light energy. Welding which is the process of joining two metallic components for the desired purpose can be defined as the process of joining two similar or dissimilar metallic components with the application of heat, with or without the application of pressure, and with or without the use of filler metal. 1 Survey of welding, and allied processes
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