AU2019208227A1 - Mobile flash-butt welding method for 60kg/m r260 hot-rolled rail - Google Patents
Mobile flash-butt welding method for 60kg/m r260 hot-rolled rail Download PDFInfo
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- AU2019208227A1 AU2019208227A1 AU2019208227A AU2019208227A AU2019208227A1 AU 2019208227 A1 AU2019208227 A1 AU 2019208227A1 AU 2019208227 A AU2019208227 A AU 2019208227A AU 2019208227 A AU2019208227 A AU 2019208227A AU 2019208227 A1 AU2019208227 A1 AU 2019208227A1
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
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Abstract
Abstract The invention discloses a mobile flash-butt welding method for 60kg/m R260 hot-rolled rail, comprising a pre-flash stage, a flash stage, an boost stage, an upset stage and a forge stage; the total welding heat input is 3.0-4.8MJ, the total welding duration is 110-135s, and the welding upset allowance is 12.4-16.7 mm. The invention can improve the rail welding quality by controlling the total welding heat input, the total welding duration and the upset allowance in the mobile flash-butt welding process, as well as controlling the welding heat input and duration of each stage. According to the invention, the 60kg/m R260 hot-rolled rail can be successfully subjected to mobile flash-butt welding. As a result, the total width of the heat affected zone of the mobile flash-butt welding joint of whole 60kg/m R260 hot-rolled rail can be controlled within 32mm, and the difference between the maximum and the minimum value thereof is not more than 8.2mm, so as to reduce internal defects of the rail joint and ensure stable welding quality. Fig. 1 Fig. 2
Description
Mobile Flash-butt Welding Method for 60kg/m R260 Hot-rolled Rail
This application claims priority from CN Application No. 201810834827.0 filed on 26 July 2018, the contents of which are to be taken as incorporated herein by this reference.
Technical Field
The Invention relates to the technical field of rail welding, in particular to a mobile flash-butt welding method for 60kg/m R260 hot-rolled rail.
Background of the Invention
The rail flash-butt welding joint is composed of a welding zone and an adjacent rail base metal, and the welding zone is divided into weld bond line and welding heat affected zone (HAZ). Further, the HAZ can be roughly divided into a coarse-grained region, a fine-grained region and an incomplete recrystallization region according to the distance from each point on the rail base metal to the weld bond line. In particular, the coarse-grained region is also known as an overheated zone with a temperature of around 1200°C and close to the partial melting region. In this region, the grain size will be seriously coarse when the rail temperature exceeds 1100°C; moreover, the longer the residence time, the wider the heating zone and the more serious the grain coarsening will be. As a result, Widmannstatten structure can be easily formed in the subsequent cooling process. The coarse-grained region is characterized by the embrittlement of coarse grains and thus is the weakest link in a welded joint. The fine-grained region is a phase-transformation recrystallization region and also known as a normalized region. In this region, the temperature ranges from Ac3 to 1000°C, ferrite and pearlite of rail metal are totally transformed into austenite, and metal grains are uniform and fine after cooling. The incomplete recrystallization region is also known as a partial phase-transformation region with the temperature ranging from Acl to Ac3, and characterized by different grain sizes and uneven microstructure. In view of these characteristics inherent to the welding process such as high heating temperature, fast heating speed, short high-temperature residence time, uneven distribution of local heating temperature and continuous cooling under natural conditions, the structural transformation of a joint especially in the HAZ will inevitably be given some laws and characteristics different from rail rolling, and then create different forms of microstructure (even bainite, martensite and other harmful microstructure) around the weld bond line, thus causing a large difference in its mechanical properties. The wider the HAZ is, the more obvious the difference is. In the existing domestic and foreign standards or technical specifications for rail flash-butt welding, the HAZ width of rail is clearly defined. The narrower the HAZ is; the i
2019208227 25 Jul 2019 more favorable it is to reduce the occurrence of harmful microstructure, and the smoother the transition between the base metal and the welding zone is.
At present, the common practice over the word is to clamp and conduct the rail by clamping the rail webs, and use the pulse flash-butt welding technology. However, the mechanical properties of the rail is greatly affected due to uneven total width of the HAZ of the welded 60kg/m R260 hot-rolled rail joint, frequent bulging at the rail webs of the joint, large total width of the HAZ, and large difference between the maximum and the minimum value.
A reference herein to a patent document or any other matter identified as prior art, is not to be taken as an admission that the document or other matter was known or that the information it contains was part of the common general knowledge as at the priority date of any of the claims. Summary of the Invention
Embodiments of the invention may provide a mobile flash-butt welding method for 60kg/m R260 hot-rolled rail, which effectively controls the width of the heat affected zone, reduce internal defects of rail structure and improve the welding quality.
According to one aspect of the present invention, there is provided mobile flash-butt welding method for 60kg/m R260 hot-rolled rail, the method comprising a pre-flash stage, a flash stage, an boost stage, an upset stage and a forge stage; the total welding heat input is 3.0-4.8MJ, the total duration of welding is 110-135s, and the welding upset allowance is 12.4-16.7 mm.
Optionally, the welding heat input is 1.8-2.0MJ, the rail flashing displacement is 0.7-1.2mm, and the duration is 19-20s in the pre-flash stage; the welding heat input is 1.0-1.5MJ, the rail flashing displacement is 9.0-11.0mm, and the duration is 50-60s in the flash stage; the welding heat input is 0.5-0.6MJ, the rail flashing displacement is 13.0-14.0mm, and the duration is 32-34s in the boost stage; the welding heat input is 0.2MJ, the rail flashing displacement is 15.0-16.0mm, the duration is 2-7s, and the upset current on-time is 0.6-1.0s in the upset stage; and the duration is 12-13s in the forge stage.
Optionally, the pressure is maintained at 28-37t in the forge stage.
The beneficial effects of embodiments of the invention may include: improvement of the rail welding quality by controlling the total welding heat input, the total welding time and the upset allowance in the mobile flash-butt welding process, as well as controlling the welding heat input and the duration of each stage. The 60kg/m R260 hot-rolled rail may be successfully subjected to
2019208227 25 Jul 2019 mobile flash-butt welding, the total width of the heat affected zone of the mobile flash-butt welding joint of whole 60kg/m R260 hot-rolled rail may be controlled within 32mm, and the difference between the maximum and the minimum value thereof is not more than 8.2mm, so as to reduce internal defects of the rail joint and ensure stable welding quality.
Brief Description of the Drawings
Fig. 1 is a low-power profile of a rail welded joint in Example 1;
Fig. 2 is a low-power profile of a rail welded joint in Example 2;
Fig. 3 is a low-power profile of a rail welded joint in Example 3;
Fig. 4 is a low-power profile of a rail welded joint in Example 4;
Fig. 5 is a low-power profile of a rail welded joint in Example 5;
Fig. 6 is a low-power profile of a rail welded joint in Comparative Example 1;
Fig. 7 is a low-power profile of a rail welded joint in Comparative Example 2.
Detailed Description of the Preferred Embodiment
For the convenience of understanding the Invention, it will be further described in detail in combination with drawings and examples.
The mobile flash-butt welding method for 60kg/m R260 hot-rolled rail as claimed in the Invention comprises a pre-flash stage, a flash stage, an boost stage, an upset stage and a forge stage; the total welding heat input is 3.0-4.8MJ, the total welding duration is 110-135s, and the welding upset allowance is 12.4-16.7 mm. According to the Invention, the welding quality of the 60kg/m R260 hot-rolled rail can be improved by controlling the total welding heat input, the total welding time and the upset allowance in the mobile flash-butt welding process, so as to control the width of the heat affected zone of the joint and the joint quality, thereby reducing the internal defects of the rail joint and finally improving the welding quality.
In the Invention, the process parameters of each stage are further refined and coordinated, which are mainly reflected in the following aspects: the welding heat input is 1.8-2.0MJ, the rail flashing displacement is 0.7-1.2mm, and the duration is 19-20s in the pre-flash stage; the welding heat input is 1.0-1.5MJ, the rail flashing displacement is 9.0-11.0mm, and the duration is 50-60s in the flash stage; the welding heat input is 0.5-0.6MJ, the rail flashing displacement is 13.0-14.0mm, and the duration is 32-34s in the boost stage; the welding heat input is 0.2MJ, the rail flashing displacement is 15.0-16.0mm, the duration is 2-7s, and the upset current time is 0.6-1.0s in the
2019208227 25 Jul 2019 upset stage; and the duration is 12-13s in the forge stage.
The pressure is adjusted to 28-37t in the forge stage, so as to further improve the welding quality and ensure the welding stability.
Example 1
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.9MJ, the flashing displacement was 0.7mm, and the duration was 19.9s in the pre-flash stage; the welding heat input was 1.1MJ, the displacement was 10.3mm, and the duration was 52.3s in the flash stage; the welding heat input was 0.6MJ, the displacement was 13.4mm, and the duration was 32.9s in the boost stage; the welding heat input was 0.2MJ, the displacement was 15.6mm, the upset current time was 0.6s, and the duration was 3.7s in the upset stage; and the pressure was maintained at 30.3t for 12.9s in the forge stage. In the welding process, the total heat input was 3.9MJ, the displacement was 40.0mm and the total welding duration was controlled to 118s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 1.
Table 1
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 380 | 260 | 0.7 | 19.9 | 1.9 | / |
| Flash | 344 | 64 | 10.3 | 52.3 | 1.1 | Flash speed (0.20mm/s) |
| Boost | 356 | 56 | 13.4 | 32.9 | 0.6 | Final acceleration (0.5mm/s) Flash speed (0.4mm/s) |
| Upset | / | 897(Max) | 15.6 | 3.7 | 0.2 | Upset force (82.9t) Maximum speed (17.5mm/s) |
| Forge | / | / | / | 12.9 | / | Forge force (30.3t) |
| Whole process | / | / | 40.0 | 118 | 3.9 | Short-circuit impedance (105.9μΩ) |
Fig. 1 is a low-power profile of a rail welded joint in Example 1. In particular, the 60kg/m
R260 hot-rolled rail joint was treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 28.83mm, that of the heat affected zone at the neutral axis was 28.08mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 25.07mm, and the difference between the maximum and minimum value thereof was 7.71 mm.
2019208227 25 Jul 2019
Example 2
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.9MJ, the flashing displacement was 0.7mm, and the duration was 19.8s in the pre-flash stage; the welding heat input was 1.1MJ, the displacement was 10.4mm, and the duration was 53.6s in the flash stage; the welding heat input was 0.6MJ, the displacement was 13.5mm, and the duration was 32.8s in the boost stage; the welding heat input was 0.2MJ, the displacement was 15.7mm, the upset current time was 0.9s, and the duration was 2.3s in the upset stage; and the pressure was maintained at 30.4t for 13.0s in the forge stage. In the welding process, the total heat input was 3.8MJ, the displacement was 40.6mm and the total welding duration was controlled to 119s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 2.
Table 2
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 378 | 261 | 1.0 | 19.8 | 1.9 | / |
| Flash | 342 | 63 | 10.4 | 53.6 | 1.1 | Flash speed (0.19mm/s) |
| Boost | 353 | 51 | 13.5 | 32.8 | 0.6 | Final acceleration (0.6mm/s) Flash speed (0.4mm/s) |
| Upset | / | 859(Max) | 15.7 | 2.3 | 0.2 | Upset force (82.6t) Maximum speed (17.5mm/s) |
| Forge | / | / | / | 12.9 | / | Forge force (30.4t) |
| Whole process | / | / | 40.6 | 119 | 3.8 | Short-circuit impedance (106.7μΩ) |
Fig. 2 is a low-power profile of a rail welded joint in Example 2. In particular, the 60kg/m R260 hot-rolled rail joint was treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 29.83mm, that of the heat affected zone at the neutral axis was 28.93mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 28.22mm, and the difference between the maximum and minimum value thereof was 7.82mm.
Example 3
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.9MJ, the flashing displacement was 0.7mm, and the duration was 19.9s in the pre-flash stage; the welding heat input was 1.5MJ, the displacement was 10.0mm, and the duration
2019208227 25 Jul 2019 was 59.6s in the flash stage; the welding heat input was 0.6MJ, the displacement was 13.2mm, and the duration was 32.5s in the boost stage; the welding heat input was 0.2MJ, the displacement was 15.8mm, the upset current time was 1.0s, and the duration was 2.3s in the upset stage; and the pressure was maintained at 29.5t for 12.9s in the forge stage. In the welding process, the total heat input was 4.2MJ, the displacement was 39.7mm and the total welding duration was controlled to 124s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 3.
Table 3
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 375 | 260 | 0.7 | 19.9 | 1.9 | / |
| Flash | 345 | 74 | 10.0 | 59.6 | 1.5 | Flash speed (0.17mm/s) |
| Boost | 354 | 52 | 13.2 | 32.5 | 0.6 | Final acceleration (0.6mm/s) Flash speed (0.4mm/s) |
| Upset | / | 855(Max) | 15.8 | 2.3 | 0.2 | Upset force (82.7t) Maximum speed (18.0mm/s) |
| Forge | / | / | / | 12.9 | / | Forge force (29.5t) |
| Whole process | / | / | 39.7 | 124 | 4.2 | Short-circuit impedance (107.2μΩ) |
Fig. 3 is a low-power profile of a rail welded joint in Example 3. In particular, the 60kg/m R260 hot-rolled rail joint was treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 29.69mm, that of the heat affected zone at the neutral axis was 31.09mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 27.36mm, and the difference between the maximum and minimum value thereof was 8.02mm.
Example 4
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.9MJ, the flashing displacement was 0.9mm, and the duration was 19.8s in the pre-flash stage; the welding heat input was 1.5MJ, the displacement was 9.9mm, and the duration was 58.6s in the flash stage; the welding heat input was 0.5MJ, the displacement was 13.2mm, and the duration was 32.9s in the boost stage; the welding heat input was 0.2MJ, the displacement was 16.0mm, the upset current time was 0.9s, and the duration was 6.1s in the upset stage; and the pressure was maintained at 28.7t for 12.9s in the forge stage. In the welding process, the total heat
2019208227 25 Jul 2019 input was 4.1MJ, the displacement was 40.0mm and the total welding duration was controlled to
124s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 4.
Table 4
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 379 | 255 | 0.9 | 19.8 | 1.9 | / |
| Flash | 347 | 75 | 9.9 | 58.6 | 1.5 | Flash speed (0.17mm/s) |
| Boost | 353 | 48 | 13.2 | 32.9 | 0.5 | Final acceleration (0.5mm/s) Flash speed (0.4mm/s) |
| Upset | / | 914(Max) | 16.0 | 6.1 | 0.2 | Upset force (84.9t) Maximum speed (18.3mm/s) |
| Forge | / | / | / | 12.9 | / | Forge force (28.7t) |
| Whole process | / | / | 40.0 | 124 | 4.1 | Short-circuit impedance (107.2μΩ) |
Fig. 4 is a low-power profile of a rail welded joint in Example 4. In particular, the 60kg/m R260 hot-rolled rail joint was treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 31.29mm, that of the heat affected zone at the neutral axis was 29.82mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 27.42mm, and the difference between the maximum and minimum value thereof was 7.82mm.
Example 5
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.9MJ, the flashing displacement was 1.2mm, and the duration was 19.9s in the pre-flash stage; the welding heat input was 1.3MJ, the displacement was 10.6mm, and the duration was 55.9s in the flash stage; the welding heat input was 0.6MJ, the displacement was 13.3mm, and the duration was 33.2s in the boost stage; the welding heat input was 0.2MJ, the displacement was 15.7mm, the upset current time was 1.0s, and the duration was 3.0s in the upset stage; and the pressure was maintained at 29.6t for 12.8s in the forge stage. In the welding process, the total heat input was 4.0MJ, the displacement was 40.8mm and the total welding duration was controlled to 121s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 5.
2019208227 25 Jul 2019
Table 5
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 379 | 253 | 1.2 | 19.9 | 1.9 | / |
| Flash | 341 | 71 | 10.6 | 55.9 | 1.3 | Flash speed (0.19mm/s) |
| Boost | 352 | 51 | 13.3 | 33.2 | 0.6 | Final acceleration (0.6mm/s) Flash speed (0.4mm/s) |
| Upset | / | 878(Max) | 15.7 | 3.0 | 0.2 | Upset force (82.9t) Maximum speed (17.9mm/s) |
| Forge | / | / | / | 12.8 | / | Forge force (29.6t) |
| Whole process | / | / | 40.8 | 121 | 4.0 | Short-circuit impedance (107.2μΩ) |
Fig. 5 is a low-power profile of a rail welded joint in Example 5. In particular, the 60kg/m R260 hot-rolled rail joint was treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 28.62mm, that of the heat affected zone at the neutral axis was 28.60mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 24.99mm, and the difference between the maximum and minimum value thereof was 6.4mm.
Comparative Example 1
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.7MJ, the flashing displacement was 0.7mm, and the duration was 24.0s in the pre-flash stage; the welding heat input was 6.2MJ, the displacement was 9.9mm, and the duration was 58.5s in the flash stage; the welding heat input was 0.4MJ, the displacement was 11.6mm, and the duration was 22.4s in the boost stage; the welding heat input was 0.3MJ, the displacement was 17.4mm, the upset current time was 1.1s, and the duration was 6.7s in the upset stage; and the pressure was maintained at 28.3t for 12.0s in the forge stage. In the welding process, the total heat input was 8.5MJ, the displacement was 39.6mm and the total welding duration was controlled to 117s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 6.
2019208227 25 Jul 2019
Table 6
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 380 | 195 | 0.7 | 24.0 | 1.7 | / |
| Flash | 347 | 304 | 9.9 | 58.5 | 6.2 | Flash speed (0.17mm/s) |
| Boost | 353 | 50 | 11.6 | 22.4 | 0.4 | Final acceleration (0.5mm/s) Flash speed (0.5mm/s) |
| Upset | / | 860(Max) | 17.4 | 6.7 | 0.3 | Upset force (80.lt) Maximum speed (19.3mm/s) |
| Forge | / | / | / | 12.0 | / | Forge force (28.3t) |
| Whole process | / | / | 39.6 | 117 | 8.5 | Short-circuit impedance (106.3μΩ) |
Fig. 6 is a low-power profile of a rail welded joint in Comparative Example 1. In particular, the 60kg/m R260 hot-rolled rail joint was not treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 30.62mm, that of the heat affected zone at the neutral axis was 41.33mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 30.43mm, and the difference between the maximum and minimum value thereof was 13.57mm.
Comparative Example 2
The 60kg/m R260 hot-rolled rail was welded by a mobile rail flash-butt welder. The welding heat input was 1.7MJ, the flashing displacement was 1.7mm, and the duration was 23.8s in the pre-flash stage; the welding heat input was 6.4MJ, the displacement was 12.2mm, and the duration was 61.9s in the flash stage; the welding heat input was 0.4MJ, the displacement was 11.6mm, and the duration was 22.2s in the boost stage; the welding heat input was 0.3MJ, the displacement was 14.9mm, the upset current time was 1.1s, and the duration was 7.5s in the upset stage; and the pressure was maintained at 27.lt for 11.7s in the forge stage. In the welding process, the total heat input was 8.7MJ, the displacement was 40.4m and the total welding duration was controlled to 119s, thus achieving the purpose of controlling the width of the joint heat affected zone and the joint quality. Specific data are listed in Table 7.
2019208227 25 Jul 2019
Table 7
| Stage | Average voltage/V | Average current/A | Displacement/mm | Duration/s | Heat input/MJ | Other |
| Pre-flash | 389 | 185 | 1.7 | 23.8 | 1.7 | / |
| Flash | 352 | 293 | 12.2 | 61.9 | 6.4 | Flash speed (0.20mm/s) |
| Boost | 359 | 50 | 11.6 | 22.2 | 0.4 | Final acceleration (0.5mm/s) Flash speed (0.5mm/s) |
| Upset | / | 907(Max) | 14.9 | 7.5 | 0.3 | Upset force (75.4t) Maximum speed (20.9mm/s) |
| Forge | / | / | / | 11.7 | / | Forge force (27.lt) |
| Whole process | / | / | 40.4 | 119 | 8.7 | Short-circuit impedance (102.2μΩ) |
Fig. 7 is a low-power profile of a rail welded joint in Comparative Example 2. In particular, the 60kg/m R260 hot-rolled rail joint was not treated by the flash-butt welding method of the Invention, and the results indicated that the total width of the heat affected zone of the joint tread was 33.40mm, that of the heat affected zone at the neutral axis was 41.80mm, the longitudinal fracture degree of the heat affected zone at the rail bottom was 32.80mm, and the difference between the maximum and minimum value thereof was 12.39mm.
From Comparative Examples 1 and 2 and Examples 1 to 5, it can be seen that, the total width of the heat affected zone of the rail welded joint manufactured by the mobile flash-butt welding method for the 60kg/m R260 hot-rolled rail described in this application is controlled within 32mm, and the difference between the maximum and the minimum value thereof is not more than 8.2mm; whereas, in Comparative Examples 1 and 2 where the method described in this application is not used, the total width of the heat affected zone of the rail welded joint is more than 32mm, and the difference between the maximum and the minimum value thereof is more than 12mm, far beyond the difference of 8.2mm controlled by the application. As can be seen from Fig. 1 to 5 and Fig. 6 to 7, the width of the heat-affected zone in Fig. 1 to 5 is much smaller than that shown in Fig. 6 and Fig. 7; moreover, the upper and lower width of the heat-affected zone in Fig. 1 to 5 are relatively average and no obvious bulges are observed, indicating that the difference in the width of the heat-affected zone is not large; whereas, the distribution of the upper and lower width of the heat-affected zone in Fig. 6 and Fig. 7 is uneven, and obvious bulges can be seen, indicating a large difference in the width of the heat-affected zone.
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2019208227 25 Jul 2019
Where any or all of the terms comprise, comprises, comprised or comprising are used in this specification (including the claims) they are to be interpreted as specifying the presence of the stated features, integers, steps or components, but not precluding the presence of one or more other features, integers, steps or components.
Claims (3)
- The claims defining the invention are as follows:1 A mobile flash-butt welding method for 60kg/m R260 hot-rolled rail, the method comprising a pre-flash stage, a flash stage, an boost stage, an upset stage and a forge stage; the total welding heat input is 3.0-4.8MJ, the total welding duration is 110-135s, and the welding upset allowance is 12.4-16.7 mm.
- 2 The mobile flash-butt welding method for 60kg/m R260 hot-rolled rail according to claim 1, wherein the welding heat input is 1.8-2.0MJ, the rail flashing displacement is 0.7-1.2mm, and the duration is 19-20s in the pre-flash stage; the welding heat input is 1.0-1.5MJ, the rail flashing displacement is 9.0-11.0mm, and the duration is 50~60s in the flash stage; the welding heat input is 0.5-0.6MJ, the rail flashing displacement is 13.0-14.0mm, and the duration is 32~34s in the boost stage; the welding heat input is 0.2MJ, the rail flashing displacement is 15.0-16.0mm, the duration is 2~7s, and the upset current time is 0.6-1.0s in the upset stage; and the duration is 12-13s in the forge stage.
- 3 The mobile flash-butt welding method for 60kg/m R260 hot-rolled rail according to claim 1 or claim 2, wherein the pressure is maintained at 28-37t in the forge stage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834827.0 | 2018-07-26 | ||
| CN201810834827.0A CN108890106B (en) | 2018-07-26 | 2018-07-26 | Moving flash welding method for 60kg/m R260 hot rolled steel rail |
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| AU2019208227A1 true AU2019208227A1 (en) | 2020-02-13 |
| AU2019208227B2 AU2019208227B2 (en) | 2021-02-11 |
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| CN115488482A (en) * | 2022-11-03 | 2022-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing width of heat affected zone of high-strength pearlite steel rail flash welding head |
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| CN110512149B (en) * | 2019-07-31 | 2021-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling R260 steel rail flash welding joint martensite structure |
| CN110760761B (en) * | 2019-07-31 | 2020-10-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling R260 steel rail flash welding joint martensite structure |
| CN110512148B (en) * | 2019-07-31 | 2021-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling R260 steel rail flash welding joint martensite structure |
| CN110512139B (en) * | 2019-07-31 | 2021-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling R260 steel rail flash welding joint martensite structure |
| CN110480142B (en) * | 2019-08-26 | 2021-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling flash welding joint structure of steel rail with middle and upper limit Mn content R350HT |
| CN110480140B (en) * | 2019-08-26 | 2021-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling flash welding joint structure of steel rail with upper limit Mn content R350HT |
| CN110480138B (en) * | 2019-08-26 | 2022-08-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling upper limit Mn content R350HT steel rail flash welding joint structure |
| CN110480143B (en) * | 2019-08-26 | 2021-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling flash welding joint structure of steel rail with lower limit Mn content R350HT |
| CN110480144B (en) * | 2019-08-26 | 2021-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling flash welding joint structure of medium-limit Mn content R350HT steel rail |
| CN110480139B (en) * | 2019-08-26 | 2022-08-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling flash welding joint structure of steel rail with lower limit Mn content R350HT |
| CN113305407A (en) * | 2021-06-15 | 2021-08-27 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Flash welding process of 75kg/m 1380MPa bainite steel rail |
| CN113427109B (en) * | 2021-08-09 | 2022-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding method of copper-containing corrosion-resistant steel rail |
| CN115488483B (en) * | 2022-11-03 | 2024-04-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bonding strength of steel rail flash butt welding joint |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63215383A (en) * | 1987-03-04 | 1988-09-07 | Nippon Steel Corp | Flash welding method |
| KR20040056191A (en) * | 2002-12-23 | 2004-06-30 | 재단법인 포항산업과학연구원 | Monitoring method for flash butt welding property |
| BR112012009852B1 (en) * | 2009-10-30 | 2019-10-22 | Nippon Steel & Sumitomo Metal Corp | steel rail top arc welding method |
| CN106334863B (en) * | 2016-10-19 | 2018-09-04 | 成都先进金属材料产业技术研究院有限公司 | A kind of method and rail carrying out mobile Flash Butt Welding to 75kg/m hypereutectoid rail and pearlite steel rail |
| CN107214406B (en) * | 2017-07-28 | 2019-06-04 | 攀钢集团研究院有限公司 | Control the process of " white piece " tissue in bainite rail flash welding connector |
| CN107552936B (en) * | 2017-09-07 | 2019-09-17 | 攀钢集团研究院有限公司 | 60kg/m U75V+U75VG rail moves Flash Butt Welding technique |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115488482A (en) * | 2022-11-03 | 2022-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing width of heat affected zone of high-strength pearlite steel rail flash welding head |
| CN115488482B (en) * | 2022-11-03 | 2023-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing width of heat affected zone of high-strength pearlitic steel rail flash welding head |
Also Published As
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| CN108890106A (en) | 2018-11-27 |
| AU2019208227B2 (en) | 2021-02-11 |
| CN108890106B (en) | 2020-10-30 |
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