Abstract: A machine for the flash butt welding of rails is provided. The machine comprises electric contacts yokes having controlled drives and further comprise holes through which guide pins are passed.

Abstract: A machine for the flash-butt welding of rails has two tong-type clamping devices, made in the form of two double-arm levers mounted on a common central axle and isolated from one another, hydraulic cylinders of clamping and displacement of parts being welded, two welding transformers built into double-arm levers of one of two tong-type clamping devices, and current-carrying elements which include rods of displacement and upsetting, electric contacts-yokes and flexible jumpers. The electric contacts-yokes have controlled drives and the upper part of each electric contacts-yoke has holes, through which guide pins are passed, and a retaining spring is fixed on a lateral surface of the electric contacts-yoke.

Abstract: A machine for flash-butt welding of rails, incorporates two tong-type clamping devices made in the form of two two-arm levers carried by a common central axle with insulation from each other and capable of being displaced along the axle relative to each other by two flashing-upsetting hydraulic cylinders connecting them and having bimetal current-carrying rods. Each of the two-arm levers is hinged at one end to the rod or the clamping hydraulic cylinder case, respectively, and the other end is fitted with the clamping and current-carrying jaws. Two welding transformers built into the hollow two-arm levers of one of the two tong-type clamps are joined by current-carrying jumpers through the current-carrying part of the rods of the flashing-upsetting hydraulic cylinders to the current-carrying clamping jaws. A clamping hydraulic cylinder is made with a hydraulic intensifier built into its rod.