CN113385846A - Welding production method of bainite steel rail - Google Patents

Welding production method of bainite steel rail Download PDF

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Publication number
CN113385846A
CN113385846A CN202110659460.5A CN202110659460A CN113385846A CN 113385846 A CN113385846 A CN 113385846A CN 202110659460 A CN202110659460 A CN 202110659460A CN 113385846 A CN113385846 A CN 113385846A
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Prior art keywords
welding
steel rail
bainite steel
joint
face
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CN202110659460.5A
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Chinese (zh)
Inventor
高文会
赵智聪
涂占宽
王东
倪峥嵘
代韬
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China Academy of Railway Sciences Corp Ltd CARS
Railway Engineering Research Institute of CARS
Beijing Teletron Telecom Engineering Co Ltd
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China Academy of Railway Sciences Corp Ltd CARS
Railway Engineering Research Institute of CARS
Beijing Teletron Telecom Engineering Co Ltd
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Priority to CN202110659460.5A priority Critical patent/CN113385846A/en
Publication of CN113385846A publication Critical patent/CN113385846A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/26—Railway- or like rails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The invention discloses a welding production method of a bainite steel rail, which comprises the following steps: processing a first bainite steel rail and a second bainite steel rail; abutting the first mounting end and the second mounting end on a mounting surface parallel to the horizontal plane, and butting the end face of the first welding end and the end face of the second welding end; the first welding end is arranged in an upward inclined mode, and the inclined angle between the first welding end and the installation surface is an acute angle beta1(ii) a The second welding end is arranged in an upward inclined mode, and the inclined angle between the second welding end and the installation surface is an acute angle beta2And β2＝β1(ii) a Butt-jointing and welding the end face of the first welding end and the end face of the second welding end to form a welding joint; and carrying out tempering process treatment on the cooled welding joint. The welding production method of the bainite steel rail provided by the invention ensures that the bainite steel railThe straightness of the welded joint, the structural stress of the welded joint of the bainite steel rail and the service life of the welded bainite steel rail are prolonged, and the rail replacement overhaul cost is reduced.

Description

Welding production method of bainite steel rail
Technical Field
The invention relates to the technical field of steel rail welding, in particular to a welding production method of a bainite steel rail.
Background
The bainite steel rail has good wear resistance and stripping resistance, and if the bainite steel rail is applied to the railway steel rail, the service life of the heavy-duty railway steel rail can be prolonged, and then the overhaul cost of rail replacement is reduced.
Railway rails need a plurality of rails to be welded together in sequence to make long rails that can be used, and welded joints are formed at the welding positions during rail welding, and because of the influence of welding high temperature and deformation, the welding joints can produce certain deflection, and influence the straightness thereof. At present, because the yield ratio of the bainite steel rail is high, if a straightening process is adopted for a welded joint of the bainite steel rail after welding to ensure that the straightness of the welded joint reaches the standard requirement of the railway industry (the standard TB/T1632.1-2014 of the railway industry), the straightening force generates plastic deformation, so that the welded joint has a cracking risk; in addition, if the bainite rail welded joint is welded by the post-weld normalizing treatment process of the pearlite rail welded joint in the prior art, a large amount of brittle structures such as martensite are generated inside the weld joint of the bainite rail, and further, the risk of fatigue fracture of the welded joint during use is caused.
Therefore, it is necessary to solve the above-mentioned technical problems.
Disclosure of Invention
In view of the above, the present invention aims to provide a welding production method for a bainite steel rail, so as to ensure the straightness of a welding joint of the bainite steel rail, improve the structural stress of the welding joint of the bainite steel rail, improve the service life of the bainite steel rail after welding, and reduce the overhaul cost of rail replacement.
Based on the above purpose, the invention provides a welding production method of a bainite steel rail, which comprises the following steps: processing a first bainite steel rail and a second bainite steel rail, wherein the first bainite steel rail comprises a first mounting end and a first welding end which are oppositely arranged along the length direction, and the second bainite steel rail comprises a second mounting end and a second welding end which are oppositely arranged along the length direction; abutting the first mounting end and the second mounting end on a mounting surface parallel to a horizontal plane, and butting the end face of the first welding end and the end face of the second welding end; the first welding end is arranged upwards and obliquely towards the direction far away from the installation surface, and the inclination angle of the first welding end and the installation surface is an acute angle beta1(ii) a The second welding end is arranged upwards and slantwise towards the direction far away from the installation surface, and the inclination angle of the second welding end and the installation surface is an acute angle beta2And β2＝β1(ii) a Butting and welding the end face of the first welding end and the end face of the second welding end to form a welding joint; and carrying out tempering process treatment on the cooled welding joint.
Optionally, the welding is flash welding.
Optionally, the end face of the first welding end and the end face of the second welding end are butted to form a butted top face, a horizontal ruler is placed on the butted top face, and the vertical distance from the position, which is 100mm away from the butted top face, on the first bainite steel rail to the horizontal ruler is measured to be 0.25 mm-0.45 mm; measuring the vertical distance from the position, which is 300mm away from the horizontal top surface of the butt joint, on the first bainite steel rail to the horizontal ruler to be 0.75-1.4 mm; and measuring that the vertical distance from the position, 500mm away from the horizontal top surface of the butt joint, of the first bainite steel rail to the horizontal ruler is 0.92-1.50 mm.
Optionally, an aging placing procedure is arranged between the flash welding and the tempering process, so that the welding joint is naturally cooled.
Optionally, the time of the aging standing process is equal to or longer than 6 hours.
Optionally, a weld rib shaping process is arranged between the aging placing process and the flash welding.
Optionally, before the flash welding, a pre-welding inspection and rust removal process is performed on both the first bainite steel rail and the second bainite steel rail.
Optionally, a fine grinding process is performed on the welded joint after the tempering process.
Optionally, after the finish grinding treatment process, a process of performing appearance inspection and ultrasonic flaw detection on the welded joint is provided.
Optionally, a finished welded rail storage process is set after the appearance inspection and ultrasonic flaw detection processes.
The welding production method of the bainite steel rail provided by the invention comprises the following steps of firstly, processing a first bainite steel rail and a second bainite steel rail; then, abutting the first mounting end and the second mounting end on the mounting surface, and butting the end face of the first welding end and the end face of the second welding end; the first welding end is arranged upwards and slantwise towards the direction far away from the mounting surface; the second welding end is arranged upwards and slantwise towards the direction far away from the mounting surface; butting and welding the end face of the first welding end and the end face of the second welding end; and finally, carrying out tempering process treatment on the cooled welding joint. The long steel rail can be obtained by welding two bainite steel rails in turn according to the welding production method. By adopting the welding production method of the bainite steel rail provided by the invention, the amount of the inclined upper arch arranged before welding offsets the amount of sinking deformation of the welding joint caused by high welding temperature and deformation, the straightness of the welding joint of the bainite steel rail is ensured, the risk of cracking of the welding joint caused by a straightening process is avoided, the tempering process improves the structural stress of the welding joint of the bainite steel rail, reduces the risk of fatigue fracture at the welding joint, prolongs the service life of the bainite steel rail after welding, and further reduces the overhaul cost of rail replacement.
Drawings
The objects and advantages of the present invention will be understood by the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic view of the placement postures of a first bainite steel rail and a second bainite steel rail before welding in the bainite steel rail welding production method according to the embodiment of the present invention;
FIG. 2 is a schematic diagram of a production process of a welding production method of a bainite steel rail according to an embodiment of the present invention;
fig. 3 is a schematic end view of the first bainite steel rail and the second bainite steel rail in the bainite steel rail welding production method according to the embodiment of the present invention.
Description of reference numerals:
1: a first bainitic rail; 2: a second bainitic rail; 3: a first mounting end; 4: a first weld end; 5: a second mounting end; 6: a second weld end; 7: a mounting surface; 8: a horizontal ruler; 9: and butting the top surface.
Detailed Description
The present invention will be described in detail with reference to examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, 2 and 3, the method for producing a bainite steel rail by welding provided by the invention comprises the following steps: processing a first bainite steel rail 1 and a second bainite steel rail 2, wherein the first bainite steel rail 1 comprises a first mounting end 3 and a first welding end 4 which are oppositely arranged along the length direction, and the second bainite steel rail 2 comprises a second mounting end 5 and a second welding end 6 which are oppositely arranged along the length direction; the first mounting end 3 and the second mounting end5 are abutted against a mounting surface 7 parallel to the horizontal plane, and the end surface of the first welding end 4 and the end surface of the second welding end 6 are placed in a butt joint mode; the first welding end 4 is arranged upwards and slantwise towards the direction far away from the mounting surface 7, and the inclination angle of the first welding end 4 and the mounting surface 7 is an acute angle beta1(ii) a The second welding end 6 is arranged upwards and slantwise towards the direction far away from the mounting surface 7, and the inclination angle of the second welding end 6 and the mounting surface 7 is an acute angle beta2And β2＝β1(ii) a Butting and welding the end face of the first welding end 4 and the end face of the second welding end 6 to form a welding joint; and carrying out tempering process treatment on the cooled welding joint.
As shown in fig. 3, end faces of the first bainite steel rail 1 and the second bainite steel rail 2 are i-shaped; the end face of the first welding end 4 and the end face of the second welding end 6 can be butted by moving the first bainite steel rail 1 and the second bainite steel rail 2 at the same time, so that the next welding operation is realized; the first bainite steel rail 1 may be fixed, and only the second bainite steel rail 2 may be moved, so that the end surface of the first welding end 4 and the end surface of the second welding end 6 are butted against each other, thereby realizing the next welding operation.
The invention provides a welding production method of a bainite steel rail, which comprises the following steps of firstly, processing a first bainite steel rail 1 and a second bainite steel rail 2; then, abutting the first mounting end 3 and the second mounting end 5 on the mounting surface 7, and butting the end surface of the first welding end 4 and the end surface of the second welding end 6; the first welding end 4 is arranged upwards and slantwise towards the direction far away from the mounting surface 7; the second welding end 6 is arranged upwards and slantwise towards the direction far away from the mounting surface 7; butting and welding the end face of the first welding end 4 and the end face of the second welding end 6; and finally, carrying out tempering process treatment on the cooled welding joint. The long steel rail can be obtained by welding two bainite steel rails in turn according to the welding production method. By adopting the welding production method of the bainite steel rail provided by the invention, the amount of the inclined upper arch arranged before welding offsets the amount of sinking deformation of the welding joint caused by high welding temperature and deformation, the straightness of the welding joint of the bainite steel rail is ensured, the risk of cracking of the welding joint caused by a straightening process is avoided, the tempering process improves the structural stress of the welding joint of the bainite steel rail, reduces the risk of fatigue fracture at the welding joint, prolongs the service life of the bainite steel rail after welding, and further reduces the overhaul cost of rail replacement.
In one embodiment of the present invention, the welding is flash welding. Flash welding is a resistance welding method in which when an electric current is passed through the contact surfaces of two butted workpieces, the resistance of the fine contact points and the arc of the contact surfaces thereof generate heat to heat the butted surfaces, and after an appropriate time, pressure is applied to the joint to firmly bond the entire regions of the two butted surfaces at the same time. The range of the flash welding heat affected zone is extremely small, the surface oxide and other impurities become splashed sparks to be removed, the sparks are prevented from being mixed into a welding joint, the reliability of the welding joint is high, the service life of the bainite steel rail after welding is prolonged, and further the rail replacement overhaul cost is reduced.
As shown in fig. 1, the end face of the first welding end 4 and the end face of the second welding end 6 are butted to form a butted top surface 9, a horizontal ruler 8 is placed on the butted top surface 9, and the vertical distance from the position, which is 100mm away from the butted top surface 9, on the first bainite steel rail 1 to the horizontal ruler 8 is measured to be 0.25 mm-0.45 mm; measuring the vertical distance between the position, which is 300mm away from the butting top surface 9, on the first bainite steel rail 1 and the horizontal ruler 8 to be 0.75-1.4 mm; and measuring the vertical distance between the position 500mm away from the butt joint top surface 9 on the first bainite steel rail 1 and the horizontal ruler 8 to be 0.92 mm-1.50 mm. It should be noted that the vertical distance is a gap between the abutting top surface 9 and the bainite steel rail at different positions, and one, two or more vertical distances may be measured; the vertical distances from the corresponding different positions on the second bainite steel rail 2 to the horizontal ruler 8 can also be measured; in the embodiment, the vertical distance between the first bainite steel rail 1 and the second bainite steel rail 2 ensures that the flatness of the bainite steel rail after welding is within the range specified by the standard (the flatness of the top surface of the steel rail welding joint rail specified by the railway industry standard TB/T1632.1-2014 [ part 1 of steel rail welding: general technical conditions ] (0.1-0.4) mm/m).
Referring to fig. 1, the measurement results of the placement posture of the first bainite steel rail 1 and the second bainite steel rail 2 before welding and the flatness of the welded joint after welding are shown in table 1:
Figure BDA0003114786840000051
Figure BDA0003114786840000061
TABLE 1 measurement results of the attitude of the rail before welding and the straightness of the welded joint after welding
It should be noted that a1 is a vertical distance from a position 100mm away from the butt joint top surface 9 on the first bainite steel rail 1 to the horizontal straight edge 8; a3 is the vertical distance from the position 300mm away from the horizontal top surface 9 of the butt joint on the first bainite steel rail 1 to the horizontal ruler 8; a5 is the vertical distance measured from the horizontal distance 500mm from the weld to the horizontal straight edge 8 on the first bainitic rail 1. As can be seen from the measurement results of table 1 above: the straightness of the welded joint after welding was within the standard range.
As shown in fig. 2, the welded joint is naturally cooled by providing an aging standing process between the flash welding and tempering processes. In the embodiment, the aging placement process ensures that the welded joint is naturally cooled to normal temperature after welding, so that the bainite transformation of the bainite steel rail welded joint is completely finished, the service life of the bainite steel rail after welding is prolonged, and the rail replacement overhaul cost is further reduced. Specifically, the time of the aging placing process is equal to or more than 6 hours, so that bainite transformation of a bainite steel rail welding joint is further completed completely, the service life of the bainite steel rail after welding is prolonged, and further the rail replacement overhaul cost is reduced.
As shown in fig. 2, a weld bead shaping step is provided between the aging step and the flash welding step. In this embodiment, after carrying out flash welding with first bainite steel rail 1 and second bainite steel rail 2, adopt grinding mode to get rid of the surface plastic operation of welding the muscle to the hot welded joint immediately, it is basic parallel and level with rail parent metal to polish the rail welding muscle when welded joint is in the hot promptly, eliminate the edges and corners, after welding the muscle plastic, the inspection surface does not have the crackle, avoid appearing the defect that cold state processing probably produced, the life after the bainite steel rail welding has been improved, and then has reduced the overhaul cost of changing the rail.
As shown in fig. 2, in this embodiment, before flash welding, both the first bainite steel rail 1 and the second bainite steel rail 2 are subjected to a pre-welding inspection and rust removal process, so that the steel rail after rust removal meets the welding conduction requirement, and the welding quality after welding is further ensured. It should be noted that, before the pre-welding inspection and rust removal process, the bainite steel rail to be welded can be stored, which facilitates the extraction of the bainite steel rail to be welded.
As shown in fig. 2, in the present embodiment, a finish grinding process is performed on the welded joint after the tempering process. It should be noted that more than one idle station can be arranged between the tempering process and the finish grinding process, and no operation is performed on the idle station, so as to assist in cooling the joint, so that the tempering process and the finish grinding process can be operated in parallel, and the flatness of the welded joint is improved.
In another embodiment of the present invention, the finish grinding process may be set after the aging process, that is, the welded joint is first finish ground after welding and then tempered.
As shown in fig. 2, in an embodiment of the present invention, after the finish grinding process, an appearance inspection process and an ultrasonic flaw detection process are performed on the welded joint, so that the welding quality of the bainitic steel rail is ensured.
As shown in fig. 2, in an embodiment of the present invention, a finished welded rail storage step is provided after the appearance inspection step and the ultrasonic inspection step, and the welded long rail is moved to a finished product yard for storage, which is convenient for the welded rail to be extracted and used.
The welding production method of the bainite steel rail in one embodiment of the invention can be carried out according to the following steps: firstly, hoisting a bainite steel rail to be welded to a steel rail welding production line from a steel rail storage field to be welded, wherein the production line consists of a plurality of rollers, and the steel rail can move on the rollers along the length direction of the steel rail; moving the steel rail to be welded to a pre-welding inspection and rust removal station, and performing surface quality inspection and rust removal treatment on the bainite steel rail to be welded to enable the steel rail after rust removal to meet welding conduction requirements; moving the steel rails to be welded to a steel rail welding station, and before welding, firstly, adjusting an arching roller and a clamping device of a welding machine to place the two steel rails to be welded according to the parameters in the table 1;
then, the first welding end 4 surface and the second welding end 6 surface of the two steel rails to be welded are in butt joint and flash welding is carried out; moving the steel rail to enable the welding joint to reach a welding rib reshaping station, polishing the surface of the steel rail welding rib to be flush with a steel rail base metal when the welding joint is in a hot state, polishing to eliminate edges and corners, and checking that no crack is found on the surface after the welding rib is reshaped; moving the steel rail to enable the welding joint to reach an aging station, placing the welding joint in an aging placing field for natural cooling for 8 hours, wherein the surface temperature of the welding joint is 10 ℃, and hoisting and conveying the welded long steel rail to a production line; moving the steel rail to enable the welding joint to reach a tempering procedure station, stopping moving the long steel rail, and tempering the welding joint at the tempering procedure station according to a tempering heating process; moving the steel rail, enabling the welded joint which is subjected to tempering treatment to enter the next vacant station for natural cooling, enabling the surface temperature of the tempered welded joint to be 40 ℃ after passing through the four vacant stations, enabling the welded joint to reach a fine grinding station at the moment, and carrying out fine grinding operation on the welded joint, wherein the flatness of the welded joint is measured to be 0.35mm/m after the fine grinding operation;
finally, moving the steel rail to enable the welded joint to reach an appearance inspection station and an ultrasonic flaw detection station, inspecting the appearance quality of the welded joint, and performing flaw detection on the welded joint; and after the appearance inspection and the ultrasonic flaw detection are qualified, continuously moving the long steel rail, and moving the welded long steel rail to a finished product yard for storage.
The invention provides a welding production method of a bainite steel rail, which comprises the following steps of firstly, processing a first bainite steel rail 1 and a second bainite steel rail 2; then, abutting the first mounting end 3 and the second mounting end 5 on the mounting surface 7, and butting the end surface of the first welding end 4 and the end surface of the second welding end 6; the first welding end 4 is arranged upwards and slantwise towards the direction far away from the mounting surface 7; the second welding end 6 is arranged upwards and slantwise towards the direction far away from the mounting surface 7; butting and welding the end face of the first welding end 4 and the end face of the second welding end 6; and finally, carrying out tempering process treatment on the cooled welding joint. The long steel rail can be obtained by welding two bainite steel rails in turn according to the welding production method. By adopting the welding production method of the bainite steel rail provided by the invention, the amount of the inclined upper arch arranged before welding offsets the amount of sinking deformation of the welding joint caused by high welding temperature and deformation, the straightness of the welding joint of the bainite steel rail is ensured, the risk of cracking of the welding joint caused by a straightening process is avoided, the tempering process improves the structural stress of the welding joint of the bainite steel rail, reduces the risk of fatigue fracture at the welding joint, prolongs the service life of the bainite steel rail after welding, and further reduces the overhaul cost of rail replacement.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A welding production method of a bainite steel rail is characterized by comprising the following steps: processing a first bainite steel rail and a second bainite steel rail, wherein the first bainite steel rail comprises a first mounting end and a first welding end which are oppositely arranged along the length direction, and the second bainite steel rail comprises a second mounting end and a second welding end which are oppositely arranged along the length direction;
abutting the first mounting end and the second mounting end on a mounting surface parallel to a horizontal plane, and butting the end face of the first welding end and the end face of the second welding end;
the first welding end is arranged upwards and obliquely towards the direction far away from the installation surface, and the inclination angle of the first welding end and the installation surface is an acute angle beta1；
The second welding end is arranged upwards and slantwise towards the direction far away from the installation surface, and the inclination angle of the second welding end and the installation surface is an acute angle beta2And β2＝β1；
Butting and welding the end face of the first welding end and the end face of the second welding end to form a welding joint;
and carrying out tempering process treatment on the cooled welding joint.
2. The method for producing by welding a bainitic steel rail according to claim 1, wherein said welding is flash welding.
3. The welding production method of the bainite steel rail according to claim 2, wherein the end face of the first welding end and the end face of the second welding end are butted to form a butted top face, a horizontal ruler is placed on the butted top face, and the vertical distance from the position, which is 100mm away from the butted top face, on the first bainite steel rail to the horizontal ruler is measured to be 0.25 mm-0.45 mm; measuring the vertical distance from the position, which is 300mm away from the horizontal top surface of the butt joint, on the first bainite steel rail to the horizontal ruler to be 0.75-1.4 mm; and measuring that the vertical distance from the position, 500mm away from the horizontal top surface of the butt joint, of the first bainite steel rail to the horizontal ruler is 0.92-1.50 mm.
4. The method for producing a welded bainitic steel rail according to claim 3, wherein the welded joint is naturally cooled by providing an aging-setting process between the flash welding and the tempering.
5. The method for producing a bainite steel rail by welding according to claim 4, wherein the time for the aging process is 6 hours or more.
6. The method for producing a bainite steel rail by welding according to claim 5, wherein a weld bead shaping step is provided between the aging step and the flash welding.
7. The method for producing by welding a bainite steel rail according to claim 6, wherein, before the flash welding, a pre-weld inspection and rust removal process is performed on both the first bainite steel rail and the second bainite steel rail.
8. The method for producing a welded bainitic steel rail according to claim 7, wherein a finish grinding process is performed on the welded joint after the tempering process.
9. The method of producing a welded bainitic steel rail according to claim 8, wherein a visual inspection and an ultrasonic inspection are performed on the welded joint after the finish grinding process.
10. The method of claim 9, wherein a finished welded rail storage step is provided after the visual inspection and ultrasonic inspection steps.
CN202110659460.5A 2021-06-15 2021-06-15 Welding production method of bainite steel rail Pending CN113385846A (en)

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