100 results about "Flash welding" patented technology

The invention discloses an alpine region track frog welding auxiliary device and an operation method, and belongs to the technical field of track welding, the alpine region track frog welding auxiliary device comprises a chassis and an electric push rod A mounted on the chassis, and further comprises a polishing mechanism, a positioning mechanism, a locking mechanism and a control system which are electrically connected with a controller mounted on the electric push rod A, and the alpine region track frog welding auxiliary device comprises a data acquisition module and a data processing module, the data acquisition module is used for acquiring grinding wheel state data and grinding state data; the grinding wheel state evaluation module adjusts the rotating speed of the grinding wheel; the polishing state evaluation module outputs a polishing state coefficient; the polishing pressure evaluation module is used for outputting a pressure coefficient and pressure adjustment information; the pressure regulation and control module is used for constructing a pressure target model according to the current polishing pressure information and the pressure coefficient, outputting target polishing pressure according to the pressure regulation information and regulating the polishing pressure to the target polishing pressure; according to the invention, the waist of the steel rail can be accurately polished before flash welding of the rail frog.

A flash welding machine welds together a first metal product's tail with a second metal product's head. The machine includes a carriage, a first structure with a first grip, a second structure slidingly supported by the carriage with a second grip. The power group includes an inverter, a transformer, a rectifier, a control unit operating the inverter at frequencies greater than 700 Hz, and conductors connected to the first and second grips. The transformer delivers predetermined nominal power at a predetermined nominal supply frequency. The predetermined nominal power is less than the predetermined operating power and the nominal supply frequency is less than 700 Hz. At frequencies greater than 700 HZ, actual power equal to / greater than predetermined operating power, or the predetermined nominal power of the transformer is at least equal to predetermined operating power and nominal supply frequency is greater than 700 Hz, with actual power greater than predetermined operating power.

The flash welding mechanism comprises a static frame clamp, a movable frame clamp, an upsetting cylinder, a first clamping cylinder, a second clamping cylinder and a center shaft, a rail top block is installed on the center shaft, a first clamping piece comprises an outer side electrode and an abutting piece, and firstly, a first side face abuts against the rail head side face of the variable-section steel rail; then, the abutting end abuts against the rail head lower jaw of the variable-section steel rail, the spring is installed on the installation end and the outer side electrode in a compressed mode, and the bolt is installed at the installation end in a threaded mode; and finally, the variable-cross-section steel rail is clamped through the first clamping piece, the normal steel rail is clamped through the second clamping piece, the upsetting cylinder drives the upsetting piston rod, and flash welding of the normal steel rail and the variable-cross-section steel rail is achieved. The flash welding mechanism for the variable-cross-section steel rail can clamp and weld the variable-cross-section steel rail.

The invention discloses a traveling wave magnetic field assisted flash welding method and equipment for rare earth alloyed wheel steel, and the method adopts a traveling wave magnetic field assisted flash welding process for the rare earth alloyed wheel steel meeting the automobile lightweight requirement, and enables a traveling wave magnetic field to continuously act on a welding area in the full stages of preheating, flashing and upsetting. Wherein the rare earth elements comprise cerium (Ce) and the like, and the components of the wheel steel are optimized through microalloying treatment; the temperature is accurately controlled to be 500-650 DEG C in the preheating stage, a traveling wave magnetic field of 10-30 mT and 50-100 Hz and specific welding parameters are adopted in the flash stage, the upsetting distance is controlled to be 2-5 mm and the upsetting pressure is controlled to be 6-8 MPa in the upsetting stage, heat transfer, metal flow and rare earth distribution are improved by means of the magnetic field, grains are refined, and defects are reduced. Meanwhile, the magnetic field and welding parameters are optimized through machine learning, and the purpose of minimizing the grain size is achieved. The method can remarkably improve the metallurgical bonding strength and the structure performance of the weld joint, and is suitable for efficient and high-quality welding of the rare earth alloying wheel steel.

The invention provides special equipment for group replacement of high-speed railway turnouts and a construction method, and belongs to the technical field of railway engineering. Comprising a heavy rail car, a container type rail welding car, a plurality of special turnout transportation flatcars, a container type rail welding car and a heavy rail car which form a whole-column special marshalling used for integrated operation of transportation, replacement, welding and recovery of grouped rail pieces. A rail welding vehicle folding arm crane, a flash welding machine, rail welding vehicle auxiliary supporting legs and the like are carried on the container type rail welding vehicle; at least two flatcar folding arm cranes, flatcar auxiliary supporting legs, a lifting handrail and a special loading tool are installed on the special turnout transportation flatcar. Special equipment and a construction method are used for achieving integrated operation of the high-speed railway turnout from bulk material pre-assembly to group transportation, replacement, welding and old turnout recycling, the problem that group replacement of an existing high-speed railway turnout is completed at a skylight point is solved, and the defects of a group replacement operation technology of the high-speed railway turnout are overcome.

The invention relates to the technical field of turnout steel rail flash welding construction methods, in particular to a turnout steel rail flash welding construction method which comprises the following operation steps: S1, construction preparation; s2, a lengthened guide rail is replaced, and a steel rail is sawn; s3, adjusting the position of the turnout rail; s4, aligning a welding machine; s5, welding is conducted; s6, normalizing the welding head; s7, rough grinding; s8, flaw detection of the welding head; s9, fine grinding is conducted; during use, through two operation modes of different turnout welding processes, namely forward entering welding, entering of the highway-railway dual-purpose turnout rail welding machine along the direction of a turnout main line, six-time station adjustment and one-time line switching operation, turnout inside welding, welding in sequence, reverse entering welding and reverse entering of the highway-railway dual-purpose turnout rail welding machine from a side line can be completed, and the turnout inside welding can be completed. The welding sequence is adjusted to adapt to the structural characteristics of the turnout, welding in the turnout can be completed through two-time standing, the adjusting time is greatly shortened, the highway-railway dual-purpose turnout rail welding machine can be preferentially arranged to reversely enter the turnout according to the site construction requirement, and the alignment frequency is reduced.

The invention relates to the technical field of turnout steel rail welding, in particular to a turnout steel rail flash welding method and a welding construction method thereof.The turnout steel rail flash welding method comprises the following operation steps that S1, a steel rail to be welded and a connector are prepared; s2, adjusting the position of the turnout rail; s3, aligning a welding machine; s4, welding is conducted; s5, normalizing the welding head; s6, the welding position is polished; s7, recovering the line; wherein the step S6 comprises the following operation steps: S6.1, rough grinding of a welding head; s6.2, flaw detection is conducted on a welding head; according to the turnout steel rail flash welding method and the welding construction method of the turnout steel rail flash welding method, during construction organization, a welding machine can be preferentially arranged to reversely enter a turnout according to site construction requirements, the alignment frequency is reduced, and the auxiliary operation time is shortened; and if forward entry is required due to the limitation of field conditions, a turning path needs to be planned in advance, so that a welding machine can be quickly positioned, the turnout steel rail with a narrow opening can be welded, and the welding precision and the welding quality are ensured.

The invention belongs to the field of loop chain welding, and particularly relates to welding equipment for loop chain machining, a flash welding machine is arranged on the upper end face of a workbench, sliding frames are slidably arranged on the portions, on the upper end face of the workbench, of the two sides of the flash welding machine, a rotating disc is rotatably arranged in each sliding frame, and the two rotating discs rotate synchronously; a cross-shaped through hole is formed in the end face of each rotary disc, sliding clamping pieces are arranged in four long grooves of each cross-shaped through hole in a sliding mode, a clamping roller is rotationally arranged in each sliding clamping piece, and a loop chain winding assembly is arranged on the portion, on the lower end face of the workbench, of one side of each sliding frame. The output end of each loop chain winding assembly is connected with one end of the adjacent loop chain in a clamped mode. Through the arrangement of the clamping rollers and other assemblies, the equipment can conduct clamping welding according to loop chains of different sizes, synchronous rotation can be conducted according to the position of a welding opening of each loop chain, and therefore the welding precision of each independent loop chain is guaranteed.

The invention discloses a wheel flash welding optimization system and method based on digital twinning, and belongs to the crossing field of intelligent manufacturing, welding processes and artificial intelligence. The system comprises a material attribute database module, a multi-source data acquisition and preprocessing module, a digital twin module integrating heat-force-microstructure and other multi-physics field models, an AI prediction and multi-objective optimization module, an advanced visualization and interaction module and a closed-loop control module. The method comprises the following steps: initializing and matching material parameters; collecting data in real time to update the twinborn model; running simulation and AI to predict the welding temperature, the structure and the performance; if the prediction does not reach the standard, starting a multi-objective optimization algorithm to generate an optimal process parameter set; and executing optimization parameters through closed-loop control and performing real-time visual feedback. According to the method, full-chain real-time mapping, transparent monitoring and intelligent optimization of technology-structure-performance in the welding process are achieved, the performance stability of joints is remarkably improved, and the efficiency and the product quality are optimized.

The utility model relates to the technical field of track welding equipment, in particular to a seamless long track steel welding device, which is used for carrying out flash welding on a track by arranging a welding device I and a welding device II, can be used for well and thoroughly welding the central position of the track and improving the welding quality, and also can be used for carrying out flash welding on the track by arranging the welding device I and the welding device II. The rails are quickly and repeatedly contacted for multiple times before formal welding, so that the rails are preheated, and the welding quality is improved; comprising a body; the welding machine further comprises a moving device, a first welding device, a second welding device, an overlap pushing device and a grinding device, the moving device, the first welding device and the grinding device are all installed on the machine body, the second welding device is installed on the machine body and the first welding device, and the overlap pushing device is installed on the first welding device.

The invention provides a self-propelled flash welding rail heat treatment vehicle for urban rail transit, and belongs to the technical field of rail engineering machinery. Comprising a frame, a shed, a hook buffer device, hydraulic supporting legs, a bogie, a fuel tank, a wind source device, a tool box, an auxiliary generator set, a cab, an electrical room, a power room, a working room and a welding machine room. And a welding machine device and a movable shed capable of being electrically opened and closed are arranged in the welding machine chamber. The device has the advantages of integration of welding and heat treatment, high automation degree, environmental protection, energy conservation, flexible operation and the like, and is suitable for urban rail transit steel rail welding operation.

The utility model relates to the technical field of new energy steel rail welding, in particular to a new energy steel rail flash welding machine container structure which comprises a first container and a second container which are mutually independent, the second container supplies power to the first container through a power supply line, and electrical equipment, a hydraulic system and a working machine head are arranged in the first container. The hydraulic system comprises a hydraulic pump station and a plurality of valve assemblies, a phosphoric acid battery system and electrical equipment are arranged in the second container, the phosphoric acid battery system comprises a lithium iron phosphate battery pack, a battery bin, a power battery rack, a super-capacity cabinet and a two-way converter, and the lithium iron phosphate battery pack is installed on the power battery rack; and the battery is fixed in the battery compartment and is communicated with the super-capacity cabinet. According to the invention, the space transshipment cooling equipment is utilized to cool the heavy-load equipment, so that the working stability of the equipment is improved, the access door and the double containers are communicated for use through the power supply line, and the installation and maintenance of perfect electromechanical equipment and various equipment are facilitated.

The application discloses a kind of 800 MPa level cold-rolled martensitic steel hot-rolled substrate laser welding method, belongs to the technical field of welding.The application adopts laser butt welding process, the tail of front coil strip steel and the head of rear coil strip steel is formed loop respectively by welding machine pinch roll before and after welding machine, positioning and centering after being carried out to strip head and tail, using double cutting shear is cut to head and tail to ensure the quality of welding machine end surface.The application moves laser from operating side to transmission side by protection gas purging, cooperates with the front and rear heat devices that advance with laser and carries out butt welding, avoids the shortcomings of traditional laser welding high energy consumption and flash welding, reduces production cost and process complexity, improves production speed and weld quality, reaches the purpose that 800 MPa level cold-rolled martensitic steel hot-rolled substrate is welded.

The utility model belongs to the technical field of railway engineering mechanical equipment manufacturing, and particularly relates to an overlap pushing knife structure for turnout welding. The device comprises an upper overlap pushing knife assembly and a rail bottom overlap pushing knife, a cutting edge is formed in the inner side of the upper beading removing cutter assembly; pull rod locking notches are formed in the two ends of the top of the upper overlap pushing knife assembly; a cutting edge opening is formed in the top of the rail bottom beading pushing knife; each of the two ends of the rail bottom beading pushing knife is rotationally connected with a beading pushing knife pull rod; after being rotated towards the direction close to the upper portion tumor pushing knife assembly, the tumor pushing knife pull rod is clamped into the pull rod locking notch of the upper portion tumor pushing knife assembly, and then the tumor pushing knife pull rod is fixed into the pull rod locking notch through a fixing piece; according to the invention, the overlap pushing knife can be used under the condition that the space gap between the steel rails is narrow, so that the field turnout flash welding operation is more convenient, and the efficiency is higher.

The invention discloses a fixed flash welding and joint heat treatment method for a U75VH online heat treatment steel rail for a heavy haul railway, which can ensure that a fixed flash welding joint of the U75VH online heat treatment steel rail for the heavy haul railway is a normal pearlite structure by optimally designing parameters of a joint fixed flash welding process and a joint heat treatment heating process. Abnormal structures such as bainite, martensite and secondary cementite do not exist, the strength, hardness and toughness of the joint are matched with the performance of a base material, and the requirement of a heavy haul railway for the smoothness of the steel rail joint can be met. And the risk that the steel rail is fractured due to'saddle-shaped 'abrasion caused by too large hardness difference of a welding area or a microscopic abnormal structure of a joint in the line service process is improved, and the line operation safety is guaranteed.

The present invention discloses a chain conveying device for a full-automatic chain flash welding machine, which comprises a frame, an anvil and a chain turning mechanism. The anvil is installed on the frame, and the chain turning mechanism is installed on the frame and comprises a clamping plate assembly and a clamping plate driving assembly. The clamping plate assembly includes two clamping plates respectively arranged on both sides of the anvil along a first horizontal direction. The clamping plates are slidably installed on the frame along the first horizontal direction. A turning frame is fixedly installed on the inner side of the upper end of the clamping plate. The turning frame includes a cross plate and an inclined plate. One end of the cross plate is fixedly installed on the inner side of the clamping plate. The lower end of the inclined plate is fixedly connected to the other end of the cross plate, and the upper end inclines away from the cross plate. The clamping plate driving assembly is used to drive the two clamping plates to move respectively along the first horizontal direction. The chain conveying device for the full-automatic chain flash welding machine of the present invention can be applicable to the feeding of round steel bars of various specifications and is convenient to operate.

The application discloses a method for reducing the flash welding forming cracking rate of 590MPa grade wheel rim wheel steel, and the chemical components of the wheel steel are as follows in percentage by weight: C: 0.06-0.10%, Si: 0.05-0.30%, Mn: 1.40-1.60%, P: 0.020% or less, S: 0.010% or less, Alt: 0.020-0.040%, Nb: 0.035-0.055%, Ti: 0.010-0.025%, N: 0.0040-0.0060%, Ti / N: 2.0-4.0, and the balance is Fe and inevitable impurities; and the manufacturing process comprises the following steps: final rolling temperature: 840-880 DEG C, cooling speed after final rolling: 20-30 DEG C / s, and coiling temperature: 570-600 DEG C. The application aims to provide a method for reducing the flash welding forming cracking rate of 590MPa grade wheel rim wheel steel, improving the welding process adaptability of products, reducing the welding forming cracking rate, and reducing the waste product rate.

The utility model provides an endless direct rolling production device for bars and wires, which comprises a billet discharge roller way, a hot delivery roller way, a hot delivery roller way and a hot rolling roller way, wherein the billet discharge roller way is used for transporting billets produced by a continuous casting machine; the hot conveying roller way is used for conveying the steel billets to the induction heating device and conveying the steel billets subjected to heat compensation to the first pinch roller; the induction heating device is used for compensating heat of the steel billet to a preset temperature; the first pinch roll is used for adjusting the moving speed of the steel billet; the movable flash welding device is used for welding the front steel billet and the rear steel billet together; the swing roller way is used for supporting the welded steel billet; the second pinch roll is used for providing clamping thrust for the welded steel billet; and the deburring device is used for removing welding burrs on the welded steel billets and conveying the steel billets with the burrs removed to the roughing mill unit. The continuous-cast billets are directly conveyed to the rolling mill through the roller way to be rolled, the tails and the heads of the front billet and the rear billet are welded together in the conveying process, the front billet and the rear billet enter a roughing mill unit as one billet, and therefore endless direct rolling is achieved.

This invention belongs to the field of metal welding technology and relates to a heat treatment method for hypereutectoid rail steel after flash welding, comprising the following steps: post-weld cooling: the welded joint is allowed to cool naturally in air after flash welding; normalizing treatment: the welded joint is heated to a normalizing temperature above the austenitizing temperature and held at that temperature; controlled cooling: the temperature of the weld heat-affected zone of the welded joint is cooled from the normalizing temperature to the isothermal transformation temperature within the pearlite phase transformation temperature range at a first cooling rate, held at that temperature until the austenite undergoes pearlite transformation, and then the welded joint is cooled from the isothermal transformation temperature to below 200°C at a second cooling rate lower than the first cooling rate. The method of this invention can effectively eliminate the network cementite structure in the flash welding heat-affected zone, while avoiding the introduction of harmful structures such as martensite or bainite, ensuring that the microstructure of the weld heat-affected zone is pearlite with fine lamellar spacing.

This invention discloses a friction-assisted flash welding device and method for steel rails, comprising a stationary frame, a moving frame, a fixture, a drive device, an extrusion end electrode, a moving frame electrode, a friction extruder, a stationary frame electrode, an upsetting device, and a controller. The friction extruder is detachably mounted on the fixture and includes a first contact surface and a second contact surface. The first contact surface is used to contact a first welding surface, and the second contact surface is used to contact a second welding surface. The drive device drives the fixture and the friction extruder to reciprocate together along a length direction perpendicular to the first rail to be welded. The first rail to be welded includes a first welding end, and the moving frame electrode is attached to the first welding end. The second rail to be welded includes a second welding end, and the stationary frame electrode is attached to the second welding end. The extrusion end electrode is attached to the friction extruder. The friction-assisted flash welding device and method for steel rails provided by this invention improve the mechanical properties and welding quality of the welded joint.

A welding machine, preferably of the flash-butt type, designed to facilitate the maintenance of clamping devices (3, 4, 6, 7) of two longitudinal metal products to be welded, for example the maintenance of the clamps. Advantageously, a first structure (2) provided with first clamping devices (3, 4) and a second structure (5) provided with second clamping devices (6, 7) are supported in a first portion (10) of a carriage (1) delimited by a first beam (9) and a second beam (8) of the carriage (1) parallel to the feed direction X, while at least one transformer (36) is fixed to the carriage (1) and supported in a second portion (11) of the carriage (1) arranged laterally outside the first portion (10). Furthermore, two upsetting cylinders (23, 24) are arranged along a plane Y inclined at a non-zero acute angle with respect to the horizontal plane and passing through the passage area of the longitudinal metal products along the feed direction X.

This invention provides a control system and method for a rail flash welding machine based on a distributed fieldbus. The system includes a host module, a DC power supply module, a voltage regulator, and multiple fieldbus slave modules. The host module, the DC power supply module, and the voltage regulator are housed in a control system cabinet. The multiple fieldbus slave modules are distributed among the power supply unit, the chiller, the hydraulic station, the crane, the flash welding head, and the voltage regulator. Therefore, the host module and the multiple slave modules in this invention can select either a fieldbus or an Ethernet bus based on the characteristics of the transmitted signals to achieve collaborative communication between the host and slave modules, meeting the real-time requirements of the signals. Furthermore, the data transmission lines of this invention are simple, have strong anti-interference capabilities and stability, and improve the high-speed data acquisition requirements and the execution efficiency of the carrier.

The present invention belongs to the fields of ships and offshore engineering, and in particular, to a simple chain link overload protection device, including a chain link. The chain link includes two arc-shaped portions, two first straight body connecting portions, and a straight body portion. The two ends of the straight body portion are integrally formed with the two arc-shaped portions respectively, and one end of each of the two arc-shaped portions is integrally formed with the first straight body connecting portion. An overload protection portion is provided between the two first straight body connecting portions. The present invention is simple and practical. The required remaining strength and cross-sectional area can be calculated as needed, and then the chain link can be processed to the corresponding cross-sectional area to achieve the purpose of overload protection. On the other hand, when the non-welded chain link is used as a counterweight chain, compared with the ordinary counterweight chain, the processes of flash welding and weld non-destructive testing are reduced, the cost is greatly reduced, and the practicability is significantly improved.

This invention provides a pressure welding equipment and method for the combined flash welding of the end face and the induction welding of the inner wall of thick-walled cylindrical parts. The equipment includes a frame, a rotating device, a rotating electrode device, an upsetting device, an argon protection device, a cleaning device, and an inner wall induction heating device. The rotating electrode device and the inner wall induction heating device constitute a dual heat source system that can operate independently or in tandem. The outer wall electrode uses contact discharge to achieve flash heating, while the inner wall induction coil uses non-contact heating to address the temperature difference between the inside and outside of the thick-walled part. The upsetting device applies axial upsetting pressure to form the weld. After upsetting, the inner induction coil continuously induction heats the weld to achieve in-situ high-temperature normalizing, eliminating uneven microstructure. The vertical roller has both axial feeding and positioning functions and upsetting reverse locking functions. The inner wall device uses a web-type support mechanism to deploy the traveling wheels to fit the inner wall, achieving automated welding and cleaning of the inner wall. This invention achieves dual-process synergy, integrated post-weld normalizing, and high-quality welding of the end face of large, thick-walled cylindrical parts.

The invention provides a constant displacement control method for steel rail flash welding, and belongs to the technical field of rail welding. The constant displacement control method comprises the steps that steel rail flash welding is divided into a flash heating stage and an upsetting stage, and the flash heating stage is divided into a pulse flash stage and a continuous flash stage; setting a steel rail consumption reference value and a heat input reference value in a flash heating stage; the actual input heat and the first actual displacement of the steel rail are monitored in the pulse flash stage; determining a heat compensation scheme of the continuous flash stage based on the error between the first actual displacement and the steel rail consumption reference quantity; and the second displacement of the steel rail is controlled based on the heat compensation scheme in the continuous flashing stage. According to the constant displacement control method provided by the invention, the problem that the steel rail consumption cannot be accurately controlled when the steel rail closure opening is stretched and welded in the prior art is solved, the application range of flash welding in the field of closure opening welding is greatly widened, and the defects of a site construction technology are effectively made up.

This invention belongs to the field of rail welding and discloses a method for controlling the softening zone of bainitic rail welded joints. The method includes: welding bainitic rails using flash welding, wherein the flash welding includes a preheating stage, a continuous melting stage, and an accelerated melting stage. During the preheating stage, the thickness of the molten layer of the welded joint is controlled to be 1.5~2.5 mm; during the continuous melting stage, the temperature of the molten pool is controlled to be 1480~1530℃; the welded high-temperature rail joint is then subjected to a three-stage gradient cooling process: first, cooling at a rate of 18~22℃ / s to near the bainitic transformation point; then, cooling at a rate of 0.08~0.12℃ / s for a predetermined time; and finally, cooling at a rate below 0.5℃ / s to room temperature. This invention significantly reduces the melting amount, avoids excessive melting of the rail base material, and reduces the expansion of the heat-affected zone, achieving a softening zone width ≤0.5 mm, which is 80% smaller than the softening zone width of the Bombardier BWR system.

The application discloses a steel rail with good flash welding performance, and chemical components include C 0.60-0.74%, Si 0.30-0.60%, Mn 0.25-0.50%, Nb 0.01-0.04%, Ti 0.02-0.06%, P≤0.025%, S≤0.025%, wherein the ratio of the content of Mn element to the content of S element should be controlled to be 30-40, and the rest is Fe and inevitable impurities. The application aims to solve the problem that the Mn element gathered at the rail waist and rail bottom during the flash welding process of the steel rail for railway is easy to form oxides, resulting in more ash spot defects at the weld. The application provides a steel rail with good flash welding performance and a production method thereof. The alloy element regulation and the smelting, rolling and heat treatment process are used to realize the good matching of the welding performance and the mechanical performance of the steel rail, thereby improving the comprehensive use performance and the service life of the steel rail, and meeting the railway development requirement.

The invention discloses a thermal simulation method capable of predicting the flash welding performance of a steel rail, and belongs to the technical field of steel rail welding. Comprising the following steps: (1) a thermal simulation method: step 1, extracting welding thermal cycle parameters, collecting a temperature-time curve T-t of field flash welding by adopting an infrared thermometer and a thermocouple, and extracting characteristic parameters; 2, performing a thermal-mechanical coupling simulation test; 3, performance testing and model establishment; 2) standardized sample design and geometric dimension: simulating flash welding scene design, and slotting at 1 / 2 position of a conventional compressed sample by linear cutting with the width delta L of 0.1 mm and the depth d of 2.5 mm; material matching: chemical components of the sample are consistent with those of the to-be-welded steel rail, and the sample is treated by the same rolling process. The microscopic structure of the steel rail flash welding joint is accurately predicted through laboratory tests, the mechanical property of the steel rail flash welding joint is determined, the field test frequency is reduced, and the production cost is reduced.

The application discloses a heat treatment method for improving the width uniformity of a heat affected zone of a rail welded joint, and the method comprises the following steps: moving a rail through flash welding to obtain a welded rail; naturally cooling the welded joint of the welded rail to room temperature; using an electric induction coil to perform full-section induction heating on the welded joint; controlling the width of the heating area of the rail welded joint by using a cooling device during the heating process; and immediately spraying air to cool after heating to a predetermined temperature. The heat treatment method mainly aims at the technical problems that the width of the heat affected zone of the rail flash welded joint after post-weld heat treatment is not uniform, the width of the heat affected zone is too large, and the use performance and driving safety of the rail are affected. After the method is used, a pearlitic rail flash welded joint with high comprehensive performance, high uniformity of the width of the heat affected zone and small width of the heat affected zone is finally obtained.

The embodiment of the present application provides a forged chain and a manufacturing process for a scraper conveyor by friction welding. The base material is heated and then forged to obtain a forged ring; a part of the forged ring is cut along the width direction to obtain half rings with twice the number of the part of the forged ring; a friction welding device is used to alternately distribute the forged rings and the half rings, and two half rings with opposite openings are friction welded into a welded ring, and the forged rings and the welded rings are alternately distributed to form a chain. Compared with the traditional direct bending and forming of bar materials, the forged ring has higher material strength and a denser internal tissue structure, thus improving the overall load-bearing capacity and service life of the chain; the welded ring formed by linear friction welding has no defects such as burns and cracks on the surface of the chain link compared with flash welding, and there will be no phenomenon of false welding; the alternate distribution of the forged rings and the welded rings is realized through the friction welding device, and this process greatly improves the production efficiency compared with the traditional manual chain making and welding.