A method for welding balls provides a component, provides at least two balls, places at least one first ball of the at least two balls on the component, and applies an electrical voltage in such a manner that a current flows through the at least two balls and through the component, wherein the at least two balls are simultaneously welded together and the first ball is simultaneously welded to the component.

A device (100) for covering the welding area for hot rolling lines consists of an outer container (1), a protective shield (2), a blade-holder (3) with scraping blades, and an actuator (9). Protection occurs by linearly sliding the protective shield (2) outside the outer container (1) up to minimizing the gaps with the billets. The cleaning occurs at the same time as the return to the rest position: the scraping blades, which are integral with the container (1) and are installed in contact with the inner surface of the protective shield (2), slide thereon during the raising, thus colliding with the deposits of solidified material and removing them. Completing the device (100) additionally is a small alternating linear motion of the protective shield (2) during operation to always keep the attachment area of the scraping blades clean, thus avoiding the need for excessive detachment forces at the beginning of the raising.

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).

Application of the machine for flash-butt welding of rails with one rod, which connects two tong-type clamping devices is widening greatly the functional capabilities at its service, both in welding of separate rails and also in repair of rail tracks under the field conditions and in hard-to-reach places such as railway switches and frogs, the underground tracks, rails, which are laid side by side at a close distance, etc., not changing the optimum process and quality of the welded joints.

A welding head for welding the extremities of two sections of rail and comprises two half-heads (10) aligned and sliding with regard to one another in a longitudinal direction. Each half-head comprises grip mechanism (12, 13) for grasping a respective section of rail and two electrodes (16) suitable for contact with respective sections of rail in order to carry out a flash butt weld. The head also comprises traction actuator mechanisms (20) which extend in a longitudinal direction and are connected to the two half-heads (10) to shift the two half-heads in a longitudinal direction one towards the other, the traction actuator mechanism (20) having a stroke suitable for allowing, during a cycle of welding two sections of rail, simultaneous regulation of rail tensions.

A welding unit for connecting two rails of a track by flash-butt welding, includes clamping jaws having contact surfaces intended for application to a rail web and a power jaw for current transmission having a contact surface for application to the rail web. The power jaw is displaceable relative to the clamping jaw in a pressing direction leading to contact with the rail. In an inoperative position spaced from the rail web, the power jaw, due to the pressure of a pressure spring, is situated in a forward end position with regard to the pressing direction, in which the contact surface of the power jaw projects beyond the contact surface of the clamping jaw.

Application of the machine for flash-butt welding of rails with one rod, which connects two tong-type clamping devices is widening greatly the functional capabilities at its service, both in welding of separate rails and also in repair of rail tracks under the field conditions and in hard-to-reach places such as railway switches and frogs, the underground tracks, rails, which are laid side by side at a close distance, etc., not changing the optimum process and quality of the welded joints.

A welding unit for welding rails of a track includes a shearing device for removing a weld bead. The shearing device includes a head part having a shearing edge and two side parts which are pivotable towards one another and have a shearing edge. A rail base section to be applied to a rail base is associated with each side part. The rail base sections each include an end region facing towards each another having a tooth system for a form-locking connection which is effective in a longitudinal direction of the rail after the two side parts have been applied to the rail.

Various embodiments relate to a band flash butt welding machine by which it is possible to weld band faces of band ends of at least one band, in particular a saw band, to each other. The band flash butt welding machine comprises clamping elements for clamping the band ends. Furthermore, the band flash butt welding machine comprises aligning elements for aligning the band ends. The second clamping elements can be moved by a drive relative to the first clamping elements in the direction of a longitudinal axis. Two aligning elements are fixedly connected to one another by a coupling device, in particular a bridge part. The coupling device defines the relative alignment of the aligning elements. The second clamping element can be moved relative to the two aligning elements. This design is advantageous for a changeover of the band flash butt welding machine for band ends having a different geometry.

The process comprises the following phases: providing one first bar (2) and one second bar (3) made of one metallic material and extending along relevant longitudinal directions, each provided with a first ending surface (4) and with a second ending surface (5); cutting the first bar (2) to obtain one reinforcing bar (100) insertable in a relevant profiled element for window/door frames and a residual bar (7) provided with the second ending surface (5); positioning the second bar (3) aligned with the residual bar (7) with respect to a direction of forward movement (D) substantially parallel to said longitudinal directions, with the first ending surface (4) of the second bar (3) facing the second ending surface (5) of the residual bar (7); resistance butt welding of the second bar (3) and of the residual bar (7) carried out by means of current flow through the ending surfaces (4, 5) facing each other to obtain a welded bar (10).