Arc welding is a fusion welding process in which the materials are joined by melting with the help of an electric arc generated between an electrode and workpieces using electric power supply. Joining is a process of assembling individual parts to form a single system. Naturally modifications in the joining techniques were introduced and newer joining methods were developed for precise, efficient, light weight, and faster production. In gas welding, various fuels are combined with oxygen to generate heat required for welding. Electron beam welding is a fusion welding process in which the heat required for welding is generated by a highly focused, high-intensity stream of electrons impinging against the work metal. Laser beam welding is a noncontact-type fusion welding process in which two or more metal pieces are joined with the help of a laser beam. In resistance spot welding, heat generated by resistance to current flow at the contact between electrode and workpiece is used to fabricate joint.