A method and system for electroslag strip cladding (ESSC) of rail heads without preheating utilizing twin electroslag strip welding techniques. The twin ESSC techniques include depositing a layer of wear and corrosion resistance cladding material onto the entire running surface of the rail head at a relatively fast welding speed of approximately sixty cm/minute with less than one cm/meter of distortion. The welding speed is achieved by moving a twin ESSC welding head along a rail, with the running surface of the rail head facing upward, or advancing a rail through a space under the twin ESSC welding head, with the running surface of the rail head facing upward, while cladding material is deposited continuously onto the running surface of the rail head.

A portable rail weld milling machine apparatus comprises a support structure comprising a milling tool, wherein the milling tool comprises a milling head for milling a railroad rail by moving the milling tool in a first direction longitudinal to parallel railroad rails, in a second direction lateral to the parallel railroad rails, and a third direction vertically.

A beam delivery system including a shield which includes at least one beam passage for transmission of at least one laser beam; an optics assembly configured to at least partly focus the at least one laser beam on the at least one beam passage; and means for providing a fluid flow through the at least one beam passage. Also provided is a train and a transport system, as well as a beam delivery method that includes: transmitting at least one laser beam through a respective at least one beam passage of a shield; at least partly focusing the at least one laser beam on the at least one beam passage; and providing a fluid flow through the at least one beam passage.

A method for joining materials, comprising placing a first metal item within a spindle; rotating the spindle to a predetermined speed; contacting the first metal item with a second metal item to create friction between the first metal item and second metal item, wherein the second metal item has a known austenization temperature that is not crossed by the created friction; applying a predetermined amount of force through the spindle, wherein application of the force stops the rotation of the spindle and joins the first metal item with the second metal item; and retracting the spindle from the first metal item.

A portable rail weld milling machine apparatus comprises a metal frame that incorporates a motor with a rotary carbide tool that is able to lock to a rail or rails for stability. The apparatus houses the required guides and motors to maneuver the tool on a plurality of axes with computer numerical control (CNC). The CNC programming is able to control the carbide tool such that the welded rail can be milled to proper profile on the entire running surface, including the top, the field side, and the gauge side of the ball of the rail.

The present invention relates to a burning apparatus for railway repair, defining an axis (P) and comprising: an air compressor assembly (2) including an inlet opening (20) and an outlet opening (21), and a combustion assembly (3) connected to the outlet opening (21) of the air compressor assembly (2), wherein the air compressor assembly (2) and the combustion assembly (3) are axially disposed along the axis (P), and wherein the air compressor assembly (2) compresses air into the combustion assembly (3).

The invention discloses a mobile flash butt welding method for 136RE+SS heat-treated rail, and particularly a mobile flash butt welding method for 136RE+SS heat-treated rail in the technical field of rail welding. The mobile flash butt welding method for 136RE+SS heat-treated rail in the invention includes a pre-flash stage, a flash stage, a boost stage, an upset stage and a forge stage, with a total heat input of 7.1 MJ-10.0 MJ, a total duration of 110 s-135 s and an upsetting distance of 12.8 mm-16.7 mm during the welding process. By adopting the method of the invention, mobile flash butt welding can be conducted for 136RE+SS heat-treated rail successfully, and the rail joint has less internal defects but stable welding quality, and can pass fatigue test, tensile test and slow bend test to meet the requirements. Besides, the rail joint can pass the drop weight test for 15 welds continuously, demonstrating better stability.

The present invention relates to a moulding assembly for aluminothermic welding of metal rails (30), comprising at least one mould part (1, 50) configured to come into contact with at least one other mould part (1, 50) and rails (30) to be welded in order to form a mould cavity (102) in which the ends (31) of the metal rails to be welded are arranged and into which a molten metal is cast in order to weld the metal rails (30), the moulding assembly being characterised in that each mould part (1, 50) comprises a seating (13) configured to be placed in contact with at least one of said rails (30), said seating (13) comprising a groove (60) into which a sealing product (40) made of intumescent material is applied.

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.

An improved process for repair of worn and damaged surfaces of railway structures such as frog and diamond transition surfaces, rail head surfaces and wheels. A worn or damaged surface is prepared using a robotically-controlled laser to melt or gouge away metal using controlled laser energy and air pressure to remove existing worn or damaged surfaces. The process further utilizes laser cladding, laser weld overlaying, or laser additive manufacturing, of formulated powder, wire or stick welding material to worn surfaces that have been prepared for material build-up to original dimensions and similar metallurgical properties.