CN109355481A - Groove-shape rail flash welding connector post weld heat treatment method - Google Patents
Groove-shape rail flash welding connector post weld heat treatment method Download PDFInfo
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- CN109355481A CN109355481A CN201811261756.6A CN201811261756A CN109355481A CN 109355481 A CN109355481 A CN 109355481A CN 201811261756 A CN201811261756 A CN 201811261756A CN 109355481 A CN109355481 A CN 109355481A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
- C21D1/785—Thermocycling
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
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- 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
- C21D9/505—Cooling thereof
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The present invention relates to groove-shape rail flash welding connector post weld heat treatment methods, belong to railway track welding technology field.Present invention solves the technical problem that be groove-shape rail flash welding connector through air-cooled impact flexibility rail head vertical section lower hardness after low, post weld heat treatment.The technical scheme is that groove-shape rail welding point is carried out to be cooled to 200 DEG C or less for the first time, then connector is heated to 850~920 DEG C of stopping heating, then second of cooling of progress stops second of cooling when being cooled to 430~520 DEG C, carries out being cooled to 10~30 DEG C for the third time immediately.The rail head vertical section hardness of groove profile rail welding point through post weld heat treatment of the present invention is 90% or more of rail base material average hardness, welding joint softened sector width is within 20mm, the abnormal structures such as martensite-free, bainite of connector simultaneously, groove-shape rail tunneling boring weld impingement function Aku >=15J through post weld heat treatment of the present invention.
Description
Technical field
The invention belongs to railway track welding technology fields, and in particular to groove-shape rail flash welding connector post weld heat treatment side
Method.
Background technique
Modern tram with its energy-saving and environmental protection, lesser investment (cost only 100,000,000 yuan/kilometer, be subway four/
One), moderate passenger capacity (transport power reaches 7000 people per hour, is more than bus), preferable riding comfort, less later period
Maintenance cost has had the maturation application achievement in a city more than 150 in the external development for passing through more than 20 years.Tramcar is solving
Certainly Downtown is changed to, suburbs are plugged into and Scene Tourist is gone sightseeing etc. has played important function, represents following hair
Open up direction.Seamless groove profile gauge lines are laid in the middle part of road, forming tramcar with shared motor is presently the most to lead in the world
Way.The welding of groove profile rail is to be laid with the key link of street railway, to ensure welding quality, is needed using reliable
Welding method.Compared with common rail, there is an asymmetric slot on the rail head of groove profile rail, it is complex-shaped, belong to heterotypic rail kind, weldering
Connect and heat treatment process in, each section temperature is uneven, and welding and Heat Treatment Control difficulty are big.Outer-slotted rail welding side of the country at present
Method has arc welding, exothermic welding and flash welding.Arc welding low efficiency, the large labor intensity of worker, welding process are easy by environment
Variation and manual operation factor influence, and joint appearance is undesirable, welding quality unstable.Exothermic welding quality is lower, a large amount of to use
Line quality is not can guarantee, flash welding is compared with exothermic welding, and low 10 times of broken rail rate or more, arc welding is slightly stronger than exothermic welding, but disconnected
Rail rate is also much higher than flash welding, therefore the welding first choice flash welding of groove profile rail.Groove profile rail uses flash welding, the week of track laying
Phase can greatly shorten.If groove profile rail flash welding connector postwelding not normalizing, low (the impact flexibility Aku < of connector impact flexibility
6.5J), standard requirements are not able to satisfy, normalizing process is improper, and connector hardness and welding joint softened sector width are not able to satisfy CECS 429:
2016 " city rail groove profile rail Flash Butt Welding quality control standards (QCS)s ".
Groove profile rail cross sectional shape and each toponym as shown in Figure 1, there is an asymmetry compared with common rail on rail head
Slot, it is complex-shaped, belong to heterotypic rail kind, after welding in heat treatment process, each section temperature is uneven, and Heat Treatment Control difficulty is big.
Heat treatment process is improper, easily leads to rail head weld dimensions hardness and welding joint softened sector width is not able to satisfy CECS 429:
2016 " city rail groove profile rail Flash Butt Welding quality control standards (QCS)s ".Rail joint after softening during route is on active service,
" saddle " abrasion preferentially easily are formed in rail head vertical section, wheel-rail impact is increased, influences rail service life, or even jeopardize driving
Safety.In addition, above-mentioned standard it further provides that, for groove-shape rail, the average hardness of welding region must not be average lower than rail base material
The 90% of hardness, softening sector width control should not have martensite within 20mm in the microstructure of Seam and heat effected zone
Or the adverse tissues such as bainite.
Patent document CN104862466A discloses a kind of method of hypereutectoid steel rail weld joint post weld heat treatment, the hair
When hypereutectoid steel rail flash welding or air pressure plumb joint use intermediate frequency or the quick heated weld seam line regions of oxyacetylene torch to 900- in bright
After 920 DEG C of peak temperature, spray wind is carried out to heating zone and is quickly cooled down.Joint welding compressed air cooling region rail head vertical section hardness
Reach the 90%-105% of base material, softening sector width is less than 20mm.However the heat-treatment of rail process is mainly for excessively total
The control of steel secondary cementite is analysed, the hypereutectoid rail referred in groove-shape rail and the above invention has entirely different micro- group
Knit, also there is notable difference on fracture toughness, wearability and fatigue behaviour, thus to its in terms of post weld heat treatment it is different
Technique requirement.It yet there are no and have no groove-shape rail welding point post weld heat treatment method pertinent literature
In conclusion needing a kind of rail head vertical section hardness control by groove-shape rail welding point in the reasonable scope
Heat treatment method guarantees the military service performance and urban tram operational safety of rail joint.
Summary of the invention
Present invention solves the technical problem that being groove-shape rail flash welding connector through air-cooled impact flexibility after low, post weld heat treatment
Rail head vertical section lower hardness.
The technical solution that the present invention solves above-mentioned technical problem is to provide groove-shape rail flash welding connector post weld heat treatment side
Method, step include: to carry out the groove-shape rail welding point to be cooled that welding obtains to be cooled to 200 DEG C of following temperature for the first time,
Then connector is heated to 850~920 DEG C of stopping heating, then carries out second of cooling, stops when being cooled to 430~520 DEG C
Only second of cooling carries out the ambient temperature that third time is cooled to 10~30 DEG C immediately.
Wherein, it is cooling to start first when welding point temperature is at 1100~1400 DEG C.
Wherein, the second cooling initial temperature controls 800 DEG C or more after the cessation of the heating.
Wherein, the first cooling and cooling natural cooling in air of third, the second cooling cooling medium that imposes are quickly cooled down.
Wherein, second is cooling using the type of cooling for spraying compressed air or water mist gaseous mixture.
Wherein, wherein cooled region is groove profile rail rail head tyre tread and driving side, and rail lip side is using air-cooled.
Wherein, it is heated after the first cooling using full face mode.
Wherein, type electric heating coil is imitated using Medium frequency induction after the first cooling or oxy-acetylene flame imitates type heater
It is heated.
Wherein, welding point is obtained by Flash Butt Welding.
Wherein, groove-shape rail is hot rolling rail, and chemical component is by weight percentage are as follows: C content 0.71~0.80%, Si contains
Measure 0.5~0.8%, Mn content 0.75~1.05%, V content 0.04~0.12%.
The beneficial effects of the present invention are:
The rail head vertical section hardness control of groove profile rail welding point through post weld heat treatment of the present invention is average in rail base material
90% or more of hardness, welding joint softened sector width control within 20mm, while it is abnormal to guarantee the martensite-free, bainite of connector etc.
Tissue；Groove-shape rail tunneling boring weld impingement function Aku >=15J through post weld heat treatment of the present invention, does not carry out post weld heat treatment
Groove-shape rail weld impingement function Aku < 6.5J.
Detailed description of the invention
Fig. 1 is groove profile rail cross sectional shape and each toponym.
Fig. 2 be the groove-shape rail welding point obtained using 1 method of embodiment rail head tyre tread under the position 5mm vertical section
Stiffening effect figure.
Fig. 3 be the groove-shape rail welding point obtained using 2 method of embodiment rail head tyre tread under the position 5mm vertical section
Stiffening effect figure.
Fig. 4 be the groove-shape rail welding point obtained using 3 method of embodiment rail head tyre tread under the position 5mm vertical section
Stiffening effect figure.
Fig. 5 is the rail head of the groove-shape rail welding point under the conditions of the postwelding compressed air cooling obtained using 1 method of comparative example
The vertical section stiffening effect figure of the position 5mm under tyre tread.
The rail head of groove-shape rail welding point of the Fig. 6 for the postwelding normalizing obtained using 2 method of comparative example under the conditions of air-cooled
The vertical section stiffening effect figure of the position 5mm under tyre tread.
Fig. 7 illustrates for the vertical section hardness determination of the position 5mm under the rail head tyre tread of groove-shape rail welding point of the invention
Figure.
Fig. 8 is groove-shape rail impact toughness of welded joint sample position schematic diagram.
Fig. 9 is groove-shape rail welding point metallographic structure sample position schematic diagram.
Specific embodiment
In the present invention, " welding point " is to be obtained after weld formation comprising including weld seam and/or normalizing heat affected area
Length be 70~110mm range region, the center in the region is steel rail welding line.In the present invention, " room temperature " be 10~
The temperature of 30 DEG C of ranges.The present invention relates to connector temperature be welding point rail head skin temperature namely rail head tyre tread temperature
Degree, is acquired temperature signal using infrared radiation thermometer, and the rail head of rail tyre tread is the contact portion of wheel and rail.
The present invention provide groove-shape rail flash welding connector post weld heat treatment method, step include: by welding obtain to cold
But groove-shape rail welding point carries out first and is cooled to 200 DEG C hereinafter, 850~920 DEG C of stopping heating being then heated to, with laggard
Row second is cooling, stops the second cooling when being cooled to 430~520 DEG C, carries out the room temperature that third is cooled to 10~40 DEG C immediately
Temperature.
Normalizing heat treatment typically refer to use usual manner by metal works be heated to Ac3 (when heating ferritic transformation for
The finishing temperature of austenite) more than 30~50 DEG C, keep the temperature a period of time after, metal works are taken out from furnace, and in air
It carries out natural cooling or is sprayed or sprays the air cooled heat treatment process of contracting.Although and the post weld heat treatment of rail joint
It is heat-treated using above-mentioned normalizing, but different from the heat treatment process that usual small size workpiece uses, because of the length after rail welding
Degree is maximum up to hundreds of meters, this just determines that the normalizing heat treatment of steel rail weld joint can not carry out after reaching target temperature
Long-time heat preservation (austenitizing temperatures above).Thus, generally use the temperature more slightly higher than conventional normalizing temperature by rail welding
After connector is heated to target temperature, then air-cooled or air-cooled heat treatment process is carried out, currently preferred normalizing heating temperature is
850~920 DEG C.
To avoid groove-shape rail welding point from the abnormal structures such as martensite occur, postwelding is carried out to groove-shape rail welding point
When heat treatment, the control of final cooling temperature during post weld heat treatment need to being quickly cooled down groove profile rail martensite transformation temperature with
On.
Wherein, it is cooling to start first when welding point temperature is at 1100~1400 DEG C.
Wherein, the second cooling initial temperature controls 800 DEG C or more after the cessation of the heating.
Wherein, carrying out first type of cooling cooling and that third is cooling is directly to place steel rail weld joint in air
The air-cooled of natural cooling is carried out, carrying out the second cooling type of cooling is to spray compressed air or water mist gaseous mixture as cooling
The rapid cooling of medium.
Wherein, cooled region is groove profile rail rail head tyre tread and driving side, and rail lip side is using air-cooled.
Wherein, it is heated after the first cooling using full face mode.Full face mode carries out heating and refers to
To being about mode that the steel rail weld joint whole cross section within the scope of 70~110mm is heated comprising the length including weld seam,
Including rail head, the web of the rail, rail bottom.
Wherein, type electric heating coil is imitated using Medium frequency induction after the first cooling and/or oxy-acetylene flame imitates type heating
Device is heated.
Wherein, welding point is obtained by Flash Butt Welding.
Wherein, groove-shape rail is hot rolling rail, and chemical component is by weight percentage are as follows: C content 0.71~0.80%, Si contains
Measure 0.5~0.8%, Mn content 0.75~1.05%, V content 0.04~0.12%.
The present invention is further illustrated by the following examples.
Groove-shape rail used originates from the 60R2 groove-shape rail of Pan Gang group development & production in following embodiment.
The welding point hardness test of following embodiment is that steel rail weld joint is machined to vertical section hardness referring to Fig. 7
Sample, and under tyre tread the position 5mm Welded Joints carry out the detection of vertical section Rockwell hardness, measuring point centered on weld seam to the left and right
Two sides are symmetrically arranged, measuring point spacing 5mm, and Rockwell hardness method is by GB/T230.1-2009 regulation progress, using HRC scale,
And with HpIndicate the hardness average value of rail base material, HjIndicate the hardness average value of connector, connector hardness is lower than 0.9HpPosition
Indicate softened region.
It is sampled referring to Fig. 8 groove-shape rail impact toughness of welded joint sample position, processes impact specimen, test ballistic work.
GB/T13298-2015 " the metal microstructure method of inspection " is pressed to rail joint metallographic referring to the sampling method of Fig. 9
Sample carries out microstructure examination, carries out etch to rail joint metallographic specimen using 3% nital, is come using Germany
Card MeF3 optical microscopy observes rail joint metallographic structure.
Embodiment 1
The temperature obtained using Flash Butt Welding is carried out in 1400 DEG C of groove-shape rail welding point it is air-cooled, when connector from
1400 DEG C when being cooled to 150 DEG C, are imitated type electric heating coil using Medium frequency induction and are broken entirely to groove-shape rail welding point region
Face heating, stops heating when the rail head vertical section temperature of rail reaches 900 DEG C, then founds the steel rail weld joint after heating
Compressed air cooling is carried out to 520 DEG C, welding point is finally air-cooled to room temperature (25 DEG C), to obtain of the invention through postwelding heat
The groove-shape rail welding point of processing.The vertical section hardness data of the position 5mm is shown in Table 1 under the rail head tyre tread of welding point, indulges disconnected
The distribution of surface hardness is as shown in Figure 2.
Table 1
By table 1 and Fig. 1 it is found that being existed using the temperature that post weld heat treatment method provided by the invention processing Flash Butt Welding obtains
When 1400 DEG C of groove-shape rail welding point, hardness average value of the gained rail joint in the region Weld pipe mill ± 60mm is
29.3HRC has reached the 97.7% of rail base material average hardness, 8mm, right side 8mm on the left of welding joint softened sector width；10 impacts
Sample mean ballistic work Aku=16.5J, and postwelding does not carry out normalizing heat treatment groove profile rail joint welding Impact energy Ak u=6.1J；
Groove profile rail joint welding tissue is pearlite+ferrite, and heat affected zone organization is pearlite, does not occur martensite, bainite etc.
Abnormal structure.
Embodiment 2
The temperature obtained using Flash Butt Welding is carried out in 1300 DEG C of groove-shape rail welding point it is air-cooled, when connector from
Type electric heating coil is imitated when being cooled to 50 DEG C, using Medium frequency induction tunneling boring is carried out to steel rail weld joint region for 1300 DEG C add
Heat.Stop heating when the rail head vertical section temperature of rail reaches 920 DEG C, then carries out obtained steel rail weld joint immediately
Welding point is finally air-cooled to room temperature (25 DEG C) to 500 DEG C by compressed air cooling, to obtain of the invention through post weld heat treatment
Groove-shape rail welding point.The vertical section hardness data of the position 5mm is shown in Table 2 under the rail head tyre tread of welding point, vertical section hardness
Distribution it is as shown in Figure 3.
Table 2
By table 2 and Fig. 2 it is found that being existed using the temperature that post weld heat treatment method provided by the invention processing Flash Butt Welding obtains
When 1300 DEG C of groove-shape rail welding point, hardness average value of the gained rail joint in the region Weld pipe mill ± 60mm is
29.3HRC, groove-shape rail base material average hardness 28.6HRC, connector hardness have reached the 102.4% of rail base material average hardness,
7mm, right side 4mm on the left of welding joint softened sector width；10 impact specimen average impact function Aku=16.1J, and postwelding does not carry out just
Burning hot processing groove profile rail joint welding Impact energy Ak u=6.1J；Groove profile rail joint welding tissue is pearlite+ferrite, hot shadow
It rings district's groups and is woven to pearlite, do not occur the abnormal structures such as martensite, bainite.
Embodiment 3
The temperature obtained using Flash Butt Welding is air-cooled in 1400 DEG C of groove-shape rail welding point progress, work as welding point
When being cooled to 40 DEG C from 1400 DEG C, type heater is imitated using oxy-acetylene flame, steel rail weld joint region progress tunneling boring is added
Heat.Stop heating when the rail head vertical section temperature of rail reaches 900 DEG C, steel rail weld joint is then subjected to compressed air cooling extremely
430 DEG C, welding point is finally air-cooled to room temperature (25 DEG C), to obtain the groove-shape rail weldering of the invention through post weld heat treatment
Connector.The vertical section hardness data of the position 5mm is shown in Table 3 under the rail head tyre tread of welding point, the distribution of vertical section hardness such as Fig. 4
It is shown.
Table 3
By table 3 and Fig. 3 it is found that being existed using the temperature that post weld heat treatment method provided by the invention processing Flash Butt Welding obtains
When 1400 DEG C of groove-shape rail welding point, hardness average value of the connector in the region Weld pipe mill ± 50mm is
29.48HRC has reached the 98.3% of rail base material average hardness, 10mm, right side 10mm on the left of welding joint softened sector width；10
Impact specimen average impact function Aku=15.8J, and postwelding does not carry out heat treatment groove profile rail joint welding Impact energy Ak u=6.1J；
Groove profile rail joint welding tissue is pearlite+ferrite, and heat affected zone organization is pearlite, does not occur martensite, bainite etc.
Abnormal structure.
Comparative example 1:
Post weld heat treatment is carried out to groove-shape rail welding point according to the method for embodiment 3, type is imitated using oxy-acetylene flame
Heater carries out tunneling boring heating to steel rail weld joint region.The difference is that rail head temperature stops heating when reaching 840 DEG C, so
Steel rail weld joint is subjected to compressed air cooling to 430 DEG C afterwards, welding point is finally air-cooled to room temperature (25 DEG C), to obtain this
The groove-shape rail welding point through post weld heat treatment of invention.Longitudinal hardness of the position 5mm under the rail head tyre tread of welding point
According to being shown in Table 4, the distributed effect of longitudinal hardness is as shown in Figure 5.
Table 4
Hardness average value of the steel rail weld joint obtained by this comparative example in the region Weld pipe mill ± 50mm is
26.2HRC is the 88.5% of rail base material average hardness, 27mm, right side 24mm on the left of softening sector width.Connector hardness and softening
Sector width is not able to satisfy CECS 429:2016 " city rail groove profile rail Flash Butt Welding quality control standards (QCS) ".
Comparative example 2
According to embodiment 3 method to groove-shape rail welding point carry out post weld heat treatment, unlike 900 DEG C of connector when
Stop heating, welding point is then air-cooled to room temperature (30 DEG C), thus obtain postwelding normalizing it is air-cooled under the conditions of groove-shape rail
Welding point.Longitudinal hardness data of the position 5mm is shown in Table 5 under the rail head tyre tread of welding point, and the distributed effect of longitudinal hardness is such as
Shown in Fig. 6.
Table 5
By table 5 and Fig. 5 it is found that for not welding obtained groove profile using post weld heat treatment method provided by the invention processing
Steel rail weld joint, hardness average value of the gained rail joint in the region Weld pipe mill ± 60mm are 24.0HRC, only up to
The 83% of rail base material average hardness is arrived.Compared with rail base material hardness, entire welding region is rendered as soft state.By this
The welding point that comparative example obtains route be on active service during easily cause rail head of rail vertical section is low to collapse, influence Track regularity and
Traffic safety.
Claims (10)
1. groove-shape rail flash welding connector post weld heat treatment method, it is characterised in that the following steps are included: by welding obtain to
Cooling groove-shape rail welding point carries out being cooled to 200 DEG C of following temperature for the first time, and connector is then heated to 850~920 DEG C
Stop heating, then progress is cooling for the second time, stops second of cooling when being cooled to 430~520 DEG C, immediately progress third time
It is cooled to 10~30 DEG C of ambient temperature.
2. groove-shape rail flash welding connector post weld heat treatment method according to claim 1, it is characterised in that: when welding connects
It is cooling that head temperature starts first at 1100~1400 DEG C.
3. groove-shape rail flash welding connector post weld heat treatment method according to claim 1 or 2, it is characterised in that: described
Second cooling initial temperature controls 800 DEG C or more after the cessation of the heating.
4. described in any item groove-shape rail flash welding connector post weld heat treatment methods, feature exist according to claim 1~3
In: the described first cooling and cooling natural cooling in air of third, the second cooling cooling medium that imposes are quickly cooled down.
5. groove-shape rail flash welding connector post weld heat treatment method according to any one of claims 1 to 4, feature exist
In: described second is cooling using the type of cooling for spraying compressed air or water mist gaseous mixture.
6. described in any item groove-shape rail flash welding connector post weld heat treatment methods, feature exist according to claim 1~5
In: second cooled region is groove profile rail rail head tyre tread and driving side, and rail lip side is using air-cooled.
7. described in any item groove-shape rail flash welding connector post weld heat treatment methods, feature exist according to claim 1~6
In: it is heated after first cooling using full face mode.
8. described in any item groove-shape rail flash welding connector post weld heat treatment methods, feature exist according to claim 1~7
In: type electric heating coil is imitated using Medium frequency induction after first cooling or oxy-acetylene flame is imitated type heater and added
Heat.
9. described in any item groove-shape rail flash welding connector post weld heat treatment methods, feature exist according to claim 1~8
In: the welding point is obtained by Flash Butt Welding.
10. described in any item groove-shape rail flash welding connector post weld heat treatment methods, feature exist according to claim 1~9
In: the groove-shape rail is hot rolling rail, and chemical component is by weight percentage are as follows: C content 0.71~0.80%, Si content 0.5
~0.8%, Mn content 0.75~1.05%, V content 0.04~0.12%.
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| CN110295274A (en) * | 2019-07-30 | 2019-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
| CN110306032A (en) * | 2019-07-30 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
| CN110343841A (en) * | 2019-07-30 | 2019-10-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
| CN110512149A (en) * | 2019-07-31 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of control R260 WELDING JOINT martensitic structure |
| CN113458568A (en) * | 2021-08-09 | 2021-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for welding medium carbon steel rail in field |
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| AU2021217996B2 (en) * | 2020-10-21 | 2023-01-12 | Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | A method for optimizing microstructure of rail welded joint |
| AT18135U1 (en) * | 2022-12-30 | 2024-02-15 | Voestalpine Railway Systems GmbH | Method and a device for welding passable components of a track using flash butt welding |
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| CN110257620A (en) * | 2019-07-30 | 2019-09-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
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| CN110306032A (en) * | 2019-07-30 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
| CN110343841A (en) * | 2019-07-30 | 2019-10-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
| CN110512149A (en) * | 2019-07-31 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of control R260 WELDING JOINT martensitic structure |
| AU2021217996B2 (en) * | 2020-10-21 | 2023-01-12 | Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | A method for optimizing microstructure of rail welded joint |
| US11866801B2 (en) | 2020-10-21 | 2024-01-09 | Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | Method for optimizing microstructure of rail welded joint |
| CN113458568A (en) * | 2021-08-09 | 2021-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for welding medium carbon steel rail in field |
| CN115287442A (en) * | 2022-08-25 | 2022-11-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Postweld heat treatment method for high-carbon microalloyed steel rail |
| CN115287442B (en) * | 2022-08-25 | 2024-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Postweld heat treatment method for high-carbon microalloyed steel rail |
| AT18135U1 (en) * | 2022-12-30 | 2024-02-15 | Voestalpine Railway Systems GmbH | Method and a device for welding passable components of a track using flash butt welding |
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Application publication date: 20190219 |