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  Chapter- 1 Welding and Welding Processes  Classification of Welding and Allied Processes Although almost all materials (metals, plastics, ceramics, and composites) can be welded but not by the same process. Toachieve this universality a large number of Welding and Allied Processes have been developed. Most of the industrially important processes amongst them classified depending upon the nature of heat source and its movement resulting in spot, seam or zon,alwelds; or on the extent of heat generation viz., low heat and high heat, are shown in Fig.  This rather unusual type of process classification has been chosen because often these processes will be referred to accordingly in the remaining text . Brief description and important uses of these processes are given in the following sections. Cast-Weld Processes These processes involve large amount of molten metal resulting in properties close to that of castings.  For achieving the desired joint properties such welds...