Patent ID: 6617548
Filing Date: 2003-09-09
Classification: B23K

Abstract:
A device for butt welding pipes (99A-B) comprising:a guide element (17) which can surround and can be fixed to one of the ends of the pipes; a carriage (1) movable along the guide element, the carriage (1) having a powered means (25) to move the carriage along the guide element (17); a welding torch (90); supporting means (26) for supporting the said welding torch (90) and moving it vertically and horizontally with respect to the carriage; a feeding means (29), said feeding means automatically feeds a welding wire to the welding torch; a movement means (27) for moving said welding torch in an oscillating way with respect to the carriage in a direction approximately parallel to the axis of the pipes to be joined; a regulation means (108), said regulation means controls the amplitude of oscillation and the time for which the torch remains in one or both limit positions of the oscillation, wherein said regulation means has a generating means (104), said generating means generates a signal relating to the angular movement of the welding torch (90) during the oscillation, wherein the regulation means (108) are of the electronic type and has a storage means (115), the storage means stores, for at least one of the stages of a welding operation, a plurality of values relating to the frequency and amplitude of oscillation of the welding torch (90) desired for the welding stage and a start and stop position of the torch oscillation; and a control means (114) for automatically controlling the movement means (27) for oscillating the welding torch (90) in relation to the stored values and to the signals generated by the generating means (104).