Abstract: A welding unit for welding two rails of a track is equipped with clamping jaws intended for lying against a rail web. The clamping jaws each have a sliding surface, which is at a distance from a contact surface in the transverse direction of the rail and is arcuately curved with respect to a cross section extending such that it is normal to a neutral axis of the rails. The jaw mount, intended for fixing the clamping jaw, has a sliding surface, which is curved in a way corresponding to the sliding surface of the clamping jaw, and so the clamping jaw is movable along the sliding surfaces in relation to the jaw mount.

Abstract: A welding unit for welding rails of a track includes two unit bodies that can be moved in relation to each other by displacement cylinders along unit guides running parallel to the rails. The displacement cylinders are connected both to pull rods and to a crossbeam. Thus a simple design having high tensile forces is possible.

Abstract: A welding unit for welding two rails of a track is equipped with clamping jaws intended for lying against a rail web. The clamping jaws each have a sliding surface, which is at a distance from a contact surface in the transverse direction of the rail and is arcuately curved with respect to a cross section extending such that it is normal to a neutral axis of the rails. The jaw mount, intended for fixing the clamping jaw, has a sliding surface, which is curved in a way corresponding to the sliding surface of the clamping jaw, and so the clamping jaw is movable along the sliding surfaces in relation to the jaw mount.

Abstract: A welding unit for welding rails of a track includes two unit bodies that can be moved in relation to each other by displacement cylinders along unit guides running parallel to the rails. The displacement cylinders are connected both to pull rods and to a crossbeam. Thus a simple design having high tensile forces is possible.

Abstract: The invention relates to a method for welding two rails (8, 10, 14) of a track using a welding unit (1) of a welding machine (20). According to the method, two rails (8,10,14) each caught by a pair of clamping jaws (6) of the welding unit (1) are moved and welded together while subjecting them to crusher cylinders (3) in the longitudinal direction of the rails. A rail anchor (16) is produced in a so-called terminal-welding step in a working direction (11) upstream of the machine (20) by linking a section of the rail (14) with ties (15) in a non-positive manner. If the actual rail temperature differs from the local neutral temperature, tensions are passed into the rails to be welded together.

Abstract: A welding device for welding together two rails of a track and producing a welded joint is composed of two halves. An air nozzle and a temperature sensor are mounted on one of the halves. Via a cooling opening of the air nozzle, a glowing-cooled hot welded joint can be cooled in a controlled manner, immediately after a welding bead has been sheared off, by supplying compressed air to the joint. Thus, optimal welding of head-hardened rails can be achieved.

Abstract: A device for aligning and retaining two rails having abutting ends to be welded together comprises a rigid frame, abutments on the frame for the rail head tread and one of the rail head sides spaced from each in a longitudinal direction along the rails, the abutments for the rail head tread being adjustable relative to the frame for engaging the rail head tread, and retaining yokes for frictionally engaging the rails and clamping the device to the rails, the retaining yokes being associated with the frame and extending in a direction extending perpendicular to the longitudinal direction.