Abstract

A method for cladding to strengthen and toughen a welded joint of a steel rail (1) and an application thereof. The method comprises: removing a steel rail structure having a preset depth in a heat-affected region (1.2) and/or a weld region (1.3) of a welded joint of a steel rail (1) so as to form a groove-shaped region to be filled (2); in the region to be filled (2), cladding a reinforcing layer (3) having the same wear resistance as a base material of the steel rail, and filling the region to be filled (2); and performing machining to enable the welded joint of the steel rail (1) to have an appearance that is basically the same as the original appearance of the steel rail (1), so as to complete cladding to strengthen and toughen the welded joint of the steel rail (1). According to the described method, it can be ensured that the difference in wear resistance between the heat-affected region (1.2) of the welded joint of the steel rail (1) and the base material of the steel rail meets requirements, so as to achieve the purpose of synchronous wear of a joint region and the base material of the steel rail, reduce the end-breakage rate of the welded joint of the steel rail (1), prolong the service life of the steel rail (1), and improve the utilization rate of railway resources.

IPC Classes  ?

• C23C 24/10 - Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
• B23K 9/18 - Submerged-arc welding

Abstract

Provided in the present invention is a method for laser strengthening and toughening treatment of a steel rail welding joint, relating to the field of railway steel rail maintenance. The method is: using an area with a lower hardness than the average hardness of the base metal and the difference thereof exceeding a first preset value as a softening area, and performing laser quenching treatment or laser shock hardening treatment on same to improve the surface hardness and wear resistance thereof; if there is an area with a higher hardness than the average hardness of the base material and the difference thereof exceeding a second preset value, then using same as a hardening area, and performing laser annealing treatment or laser tempering treatment on same to reduce the surface hardness and wear resistance thereof, thereby ensuring that the wear resistance of the steel rail welding joint and the base material is the same or substantially the same. The present invention can implement synchronous wear between each area of the steel rail welding joint and the base material, prolonging the service life of the steel rail, and eliminating the risk of blocks peeling off due to the poor bonding of the coating metal and the base material in conventional welding repair processes, so that there is no need for cumbersome grinding and rust removal processes, having greater adaptability and being capable of effectively increasing machining efficiency.

IPC Classes  ?

• C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for welded joints
• C21D 1/09 - Surface hardening by direct application of electrical or wave energySurface hardening by particle radiation
• C21D 1/18 - HardeningQuenching with or without subsequent tempering

Abstract

The disclosure discloses a method for reinforcing a rail by laser and auxiliary heat source efficient hybrid cladding. The laser and the auxiliary heat source simultaneously apply on a region to be cladded of a rail surface. The laser serves as a main heat source to enable simultaneous and rapid fusion of an added metal powder and partial substrate material in the rail surface to form a molten pool. The auxiliary heat source moves with the laser heat source in the same direction at the same speed, and performs synchronous preheating and/or post-heating on the laser molten pool, the heat-affected zone and the surface layer of the rail substrate to reduce the temperature gradient, thereby reducing the cooling rate, and avoiding martensite transformation and cracking in the heat-affected zone.

IPC Classes  ?

• C21D 1/09 - Surface hardening by direct application of electrical or wave energySurface hardening by particle radiation
• C21D 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rails
• C23C 24/10 - Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer

Abstract

A method for laser-assisted heat source efficient hybrid cladding reinforcing steel rail; the laser and the assisted heat source simultaneously act on the area to be cladded on the steel rail surface; the laser, as the main heat source, makes the cladding layer material and the substrate material of the steel rail surface portion rapidly melt at the same time to form a molten bath; the assisted heat source and the laser heat source move towards the same direction at the same speed to perform synchronized preheating or/and after heating on a laser molten bath, a heat-affected zone and a steel rail substrate surface layer so as to reduce the temperature gradient and consequently reduce the cooling rate thereof to prevent the heat-affected zone from martensite transformation and cracking. Furthermore, the railway steel rail in-situ surface can be online cladded with a metal layer, and the steel rail surface can be performed a cladding process in a production workshop.

IPC Classes  ?

• C23C 24/10 - Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
• C21D 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rails

Abstract

An onsite steel rail laser processing engineering vehicle, including a laser processing power engineering vehicle and a laser processing cart, the laser processing power engineering vehicle is connected to the laser processing cart; the onsite steel rail laser processing engineering vehicle further comprises a transport mechanism disposed on the laser processing power engineering vehicle; through movement and rotation, the transport mechanism transports the laser processing cart into the laser processing power engineering vehicle or transports the laser processing cart out from the laser processing power engineering vehicle and places it on rails.

IPC Classes  ?

• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• E01B 31/18 - Reconditioning or repairing worn or damaged parts on the spot, e.g. applying inlays, building-up rails by weldingHeating or cooling of parts on the spot, e.g. for reducing joint gaps, for hardening rails
• B60F 1/00 - Vehicles for use both on rail and on roadConversions therefor
• C21D 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rails
• C21D 1/09 - Surface hardening by direct application of electrical or wave energySurface hardening by particle radiation
• B61D 15/00 - Other railway vehicles, e.g. scaffold carsAdaptations of vehicles for use on railways
• B23K 26/08 - Devices involving relative movement between laser beam and workpiece

Abstract

An on-line laser processing engineering vehicle for a steel rail, comprising a laser processing power engineering vehicle (1) and a laser processing trolley (2), the laser processing power engineering vehicle (1) being connected to the laser processing trolley (2); the on-line laser processing engineering vehicle for a steel rail further comprising a conveying mechanism (3), provided on the laser processing power engineering vehicle (1); the conveying mechanism (3) conveying, by means of moving and rotating, the laser processing trolley (2) into the laser processing power engineering vehicle (1), or conveying the laser processing trolley (2) out from the laser processing power engineering vehicle (1) and placing same on the steel rail. Said on-line laser processing engineering vehicle for a steel rail employs a structural method of separation and combination, which can not only prevent vehicle body vibration and low movement accuracy and the like of the laser processing power engineering vehicle (1) from adversely influencing the laser processing, but also can shorten time consumption, and improve efficiency and flexibility, avoiding snakelike movement of the laser processing trolley (2), and improving accuracy of steel rail laser processing.

IPC Classes  ?

• E01B 31/18 - Reconditioning or repairing worn or damaged parts on the spot, e.g. applying inlays, building-up rails by weldingHeating or cooling of parts on the spot, e.g. for reducing joint gaps, for hardening rails

Abstract

A laser quenching method and an apparatus therefor are disclosed. According to the method, a scanning galvanometer (8) being able to quickly jump is used, so that single-time heating in a prior laser quenching process is changed into multi-time heating or even high-frequency repeated scanning heating. The heat conduction process induced by laser energy input is that: heat is irradiated onto a workpiece (8) surface with a short heating time and in a multi-time stacking mode, such that laser energy absorbed by a metal substrate is accumulated and increased, and heat conduction depth is also accumulated and increased. The apparatus comprises a laser (1), a control system (3), a light-guide system (4), a mechanical movement device (5), and the scanning galvanometer (6). Even if a relatively high laser power is selected as a process parameter, since scanning speed is high and scanning interval exists, metal surface temperature is always controlled under a melting point, and heat energy can be effectively and continuously spread from the surface to the inside of the workpiece (8). Therefore, under the condition of that metal surface melting is avoided, the workpiece (8) surface austenite region depth is improved, and laser quenching efficiency is significantly improved.

IPC Classes  ?

• C21D 1/09 - Surface hardening by direct application of electrical or wave energySurface hardening by particle radiation

Abstract

An onsite steel rail laser processing vehicle comprises a chassis (2), a vehicle body (1), a drive control room (3) and a container (4). The drive control room (3) comprises a general console (3.1), a CCD monitoring system (3.2) and a drive switch operation system (3.3). A double drive system and switching mechanism (5) with a process operation drive system (5.1), a routine on-vehicle operation drive system (5.3) and a switching mechanism (5.2) is installed in the container (4). The process operation drive system (5.1) provides the laser processing vehicle with power drive during laser processing, and can precisely control the speed and the displacement of the laser processing vehicle during process operation. The switching mechanism (5.2) is used for realizing the switching between the routine railway drive system (5.3) and the process operation drive system (5.1). The precise processing track of the laser processing vehicle can be ensured when steel rails are processed on line, and laser processing applied to various steel rails can be completed on the railway site, so that the abrasion resisting properties of the processed steel rails are improved greatly, thereby meeting the abrasion resisting requirements on the steel rails for railway expresses and heavy-load trains.

IPC Classes  ?

• E01B 31/18 - Reconditioning or repairing worn or damaged parts on the spot, e.g. applying inlays, building-up rails by weldingHeating or cooling of parts on the spot, e.g. for reducing joint gaps, for hardening rails