A welding machine, preferably of the flash butt welding type, designed to facilitate maintenance of the clamping means, e.g. clamps, of the two longitudinal metal products to be welded. Advantageously, a first structure, provided with first clamping means, and a second structure, provided with second clamping means, are supported in a first part of the carriage delimited by a first beam and a second beam of the carriage parallel to the feeding direction, while at least one transformer is fixed to the carriage and supported in a second part of the carriage, arranged laterally outside the first part.

A Mobile Electric Flash-Butt (EFB) Welding apparatus that incorporates an automated geometry system which creates field/mobile EFB welds with proper vertical alignment, within a definable distance. The system has a first pair of adjustable reference points on a left side of a mobile welding apparatus. The system has a second pair of adjustable reference points on the right side of the welding apparatus. The system has a first lifting mechanism positioned between the first pair of adjustable reference points and a second lifting mechanism positioned between the second pair of adjustable reference points. The welding line is positioned between the first and second pair of adjustable reference points and is the location of the weld. The system allows for comparatively shorter inserts than previously utilized.

Provided is a spatter scattering prevention apparatus that eliminates the necessity to, for example, remove scattered spatters and thus makes it possible to facilitate maintenance work, and also provided is a flash butt welder including the spatter scattering prevention apparatus. The spatter scattering prevention apparatus 1 according to the present invention is characterized by being configured to form a water screen in midair in the vicinity of a welding spot, at which welding is performed, wherein the water screen is for preventing spatters, generated during the welding, from scattering. The spatter scattering prevention apparatus is also characterized by being configured to form the water screen on one side in a lateral direction of the welding spot and form the water screen on the other side, laterally opposite to the one side, of the welding spot.

A device for welding a rail joint of a track, comprising two rail clamping devices spaced from one another in a rail longitudinal direction which are connected to one another via push rods to press rail ends apart prior to welding. In this, it is provided that at least one rail clamping device is coupled to a transverse displacement device for flush-aligning the rail ends after being pressed apart.

Disclosed is an apparatus for arc welding, comprising: a torch body comprising a power supply line and a gas supply line; two or more metal segments movable relative to one another being sized and shaped to surround a seam between two elongated objects to be welded together, the two or more metal segments being in electrical communication with the power supply line; and a gas jacket attached to each of the metal segments.

A welding unit for welding rails of a track includes a first sub-unit which is displaceable on unit guides in a rail longitudinal direction relative to a second sub-unit by using displacement cylinders. Each sub-unit includes clamping cylinders disposed underneath the unit guides and coupled to clamping jaws for clamping the rails. The two sub-units are connected by the displacement cylinders in that a cylinder body of the respective displacement cylinder is connected to one sub-unit and a piston rod of the respective displacement cylinder is connected to the other sub-unit. Thus, it is not necessary to support the displacement cylinders relative to a transverse beam disposed at the front.

A welding unit for welding together two rails of a track includes two rail clamping assemblies which can be moved towards one another in a longitudinal direction of the rail along unit guides by compression cylinders. Each rail clamping assembly is equipped with clamping jaws which are displaceable in pairs in a pressing plane and each of which has a contact surface provided for application to a rail web. The clamping jaws are each constructed as clamping levers which are pivotable in the pressing plane about a lever pivot axis. The contact surface intended for application to the rail web is disposed at a first lever end spaced apart from the lever pivot axis. The two contact surfaces of each rail clamping assembly are each positioned closer to the oppositely disposed rail clamping assembly than the two lever pivot axes.

A welding assembly (1) for welding two rails (2) of a track includes two rail clamping units (5) movable towards one another in an assembly longitudinal direction (4). A power rail (10) provided for power transmission is configured as an assembly guide (3), extending in an assembly longitudinal direction (4), which is spaced from displacement drives (11) and connects both rail clamping units (5) to one another. The power rail (10) is equipped with a cooling device and displaceable in the assembly longitudinal direction (4) relative to the rail clamping unit (5) equipped with the power rail contacts (8).

A butt-welding device and a method for butt welding workpieces, especially for double-upset resistance-pressure butt-welding of workpieces, particularly wires, strands and profiles, has first and second clamping members for receiving the ends of the workpieces that are to be joined. At least one clamping means can be moved between a starting position and a welding position. At least one deburring tool is provided for deburring the welded workpiece ends. In addition, at least one sensor is provided to determine the geometric dimensions of the workpieces that are to be joined, especially the diameter, the width or the height in the joining plane or substantially parallel thereto, wherein a control unit controls the movement of the clamping members and/or of the deburring tool as a function of the geometric dimension.

A welding unit for welding rails of a track has a unit lower edge forming a lower boundary of the welding unit, with regard to a vertical, and a shearing device provided for removing a weld bead. A rail base section of the shearing device is designed to be lowered, relative to the welding unit, by way of a drive from a rest position situated above the unit lower edge into a shearing position situated below the unit lower edge. Thus, the welding operation can be carried out without lifting the rails from the sleepers.