mechanical engineering

The heat of fusion is generated by an electric arc struck between two electrodes, one of which is the workpiece and the other a ‘welding rod’. The welding rod is made of a metal similar to the workpiece and is coated with a solid flux which melts and prevents oxidation of the weld. The rod is used to fill the welded joint. Power is obtained from an a.c. or d.c. ‘welding set’ providing a regulated low-voltage high-current supply to an ‘electrode holder’ and ‘earthing clamp’. The work is done on a steel ‘welding table’ to which the work is clamped and to which the earthing clamp is attached to complete the circuit.