PROCEDIMENTO E DISPOSITIVO PER LA SALDATURA DI UN PERNO PER MEZZO DI UN APPARECCHIO DI SALDATURA ELETTRICO AD ARCO

Electric-arc stud-welding apparatus for welding a stud to a workpiece comprises a stud-retaining device (4) connected to a ram (3) mounted to reciprocate in the apparatus housing (1) with axial limitation and connectable to a welding-current source, and a motor (8) operable to act linearly on the ram (3). In use, the stud is applied to the workpiece, with the formation of an electric arc between the stud and workpiece, is then lifted off from the latter, and, after fusion zones have been produced, the stud is re-applied to the workpiece, with the electric arc being quenched, and is kept in that position until the fused mass solidifies. With this apparatus and welding method, it is possible to achieve better welding quality and efficiency, as well as attaining a correct position for the effective length of the welded-on stud, the ram movements being positively and adjustably controlled in both directions of movement, as regards the in displacement paths and speeds.