Welding cooling system and welding method

Abstract

This application discloses a welding cooling system and welding method. The welding cooling system includes: a first cooling pad, a liner, a second cooling pad, a stepping motion assembly, and a controller. The first cooling pad is laid entirely on the non-welding surface of the steel plate to be welded and completely covers the weld. The steel plate to be welded is an FH420 steel plate. A first cooling channel is formed inside the first cooling pad, and the first cooling channel is filled with a first cooling medium. The liner is located on the welding surface of the steel plate to be welded. The second cooling pad is located on the welding surface of the steel plate to be welded, and is located on the side of the liner closer to the molten pool. A second cooling channel is formed inside the second cooling pad, and the second cooling channel is filled with a second cooling medium. The stepping motion assembly is connected to the liner and the second cooling pad respectively, and drives the liner and the second cooling pad to move in the vertical direction respectively. The controller is communicatively connected to the stepping motion assembly and is used to control the movement of the stepping motion assembly.

Description

Technical Field

[0001] This application relates to the field of marine engineering technology, and in particular to a welding cooling system and welding method for high heat input welding. Background Technology

[0002] In marine engineering structure construction, thick plates with a thickness of 40mm or more and a strength grade of 400MPa or more are widely used, such as FH420 steel plates. Strict requirements are placed on their toughness, requiring an average impact energy of not less than 28J at -60℃. Currently, welding of such steel plates mainly employs methods such as CO2 gas shielded welding and submerged arc welding, with welding heat input generally controlled below 50KJ / cm.

[0003] However, existing welding technologies still have significant shortcomings. First, when using high-heat welding methods such as conventional vertical gas electric welding and FCB welding to process ultra-high-strength steel thick plates (such as FH420 grade), the post-weld joint impact performance at -60℃ is difficult to meet the standards. Second, CO2 gas shielded welding or submerged arc welding has low welding efficiency and is time-consuming for thick plates. Third, these two welding methods are prone to internal defects, with CO2 gas shielded welding, due to its numerous welding passes, exhibiting particularly prominent problems such as slag inclusions and incomplete fusion within the weld.

[0004] In conclusion, there is an urgent need to overcome technical bottlenecks in the field of thick plate welding for marine engineering in order to meet the high-quality and high-efficiency construction requirements of marine engineering structures. Summary of the Invention

[0005] The purpose of this invention is to provide a welding cooling system and welding method that can solve the above-mentioned problems existing in the prior art.

[0006] To achieve the above objectives, this application adopts the following technical solution: On one hand, as an embodiment of this application, a welding cooling system is provided, comprising: A first cooling pad is laid on the non-welding surface of the steel plate to be welded and completely covers the weld; wherein the steel plate to be welded is an FH420 steel plate; a first cooling channel is formed inside the first cooling pad and the first cooling channel is filled with a first cooling medium. A liner block, the liner block being located on the welding surface of the steel plate to be welded; The second cooling pad is located on the welding surface of the steel plate to be welded, and on the side of the liner block closer to the molten pool; a second cooling channel is formed inside the second cooling pad; the second cooling channel is filled with a second cooling medium; A stepping motion assembly is connected to the liner and the second cooling pad respectively, and drives the liner and the second cooling pad to move in the vertical direction respectively; A controller is communicatively connected to the stepping motion component and is used to control the movement of the stepping motion component.

[0007] Preferably, the stepping motion component includes: A first mobile platform is connected to the bushing; the first mobile platform is communicatively connected to the controller. A second mobile platform is connected to the second cooling pad; the second mobile platform is communicatively connected to the controller. A linear guide rail is provided, which is arranged vertically, and the first moving platform and the second moving platform are movably connected to the linear guide rail.

[0008] Preferably, it further includes: An infrared imager is mounted on the second mobile platform and positioned opposite the molten pool; the infrared imager is communicatively connected to the controller. A speed sensor is mounted on the linear guide rail; the speed sensor is communicatively connected to the controller. When the infrared imager collects the real-time temperature of the molten pool and it exceeds the preset value, it feeds back to the controller. The controller then controls the first and second moving platforms to reduce their moving speeds synchronously until the real-time speed fed back by the speed sensor is within the target range. When the infrared imager detects that the real-time temperature of the molten pool is lower than a preset value, it feeds back to the controller. The controller then controls the first and second moving platforms to synchronously increase their moving speeds until the real-time speed fed back by the speed sensor is within the target range.

[0009] Preferably, it further includes: A flow sensor is installed in the first cooling channel and the second cooling channel; the flow sensor is communicatively connected to the controller. A regulating valve is installed in the first cooling channel and the second cooling channel; the regulating valve is communicatively connected to the controller. When the real-time temperature of the molten pool collected by the infrared imager exceeds the preset value, it is fed back to the controller. The controller controls to increase the opening of the regulating valve until the real-time flow rate fed back by the flow sensor is within the target range. When the real-time temperature of the molten pool is lower than the preset value, the controller controls to decrease the opening of the regulating valve until the real-time flow rate fed back by the flow sensor is within the target range.

[0010] Preferably, it further includes: Temperature sensors are respectively installed on the side of the first cooling pad opposite to the weld metal and on the side of the second cooling pad opposite to the weld metal; When the temperature sensor detects that the real-time temperatures of the first cooling pad and the second cooling pad exceed a preset value, it feeds back to the controller. The controller then controls the opening of the regulating valve to increase until the real-time temperatures of the first cooling pad and the second cooling pad detected by the temperature sensor are within the target range. When the temperature sensor detects that the real-time temperatures of the first and second cooling pads are lower than a preset value, it feeds back to the controller. The controller then controls the opening of the regulating valve to decrease until the real-time temperatures of the first and second cooling pads detected by the temperature sensor are within the target range.

[0011] Preferably, it further includes: A start / stop switch is installed at the end of the linear guide rail. When the start / stop switch detects that the liner has entered its monitoring area, it sends a feedback to the controller, which then controls the first and second moving platforms to stop synchronously.

[0012] Preferably, a first forming groove is formed at the center of the surface of the first cooling pad, and the first forming groove is arranged opposite to the location of the weld; the width of the first forming groove is 8mm to 12mm, and the depth of the first forming groove is 2.4mm to 3.6mm; a second forming groove is formed at the center of the surface of the second cooling pad, and the second forming groove is arranged opposite to the location of the weld; the width of the second forming groove is 40mm to 60mm, and the depth of the second forming groove is 4mm to 6mm.

[0013] Preferably, the thickness of the first cooling pad and the thickness of the second cooling pad are both 16 mm to 24 mm; the aperture of the first cooling channel and the aperture of the second cooling channel are both 8 mm to 12 mm; wherein the first cooling channel and the second cooling channel are both arranged in a curved shape.

[0014] On the other hand, as an embodiment of this application, a welding method using the welding cooling system described above is provided, including the steps of: A bevel is made on the edge of the steel plate to be welded, wherein the bevel angle is 16° to 24° and the gap is 4 mm to 10 mm; A first cooling pad is laid along the entire non-welding surface of the steel plate to be welded. A liner block is set on the welding surface of the steel plate to be welded, and a second cooling pad is set on the side of the liner block near the molten pool. The liner block and the second cooling pad are respectively connected to the stepping moving assembly. Welding is performed in a vertical welding position. During the welding process, the controller controls the movement of the stepping moving component, thereby driving the liner and the second cooling pad to move in the vertical direction. After welding is completed, ultrasonic probes are used to inspect the inside of the weld from both the welded surface and the non-welded surface of the welded steel plate, ensuring that the inspection is qualified.

[0015] Preferably, the step is performed in a vertical welding position. During the welding process, the controller controls the movement of the stepping moving component, thereby driving the liner and the second cooling pad to move in the vertical direction. The welding heat input is 200KJ / cm to 450KJ / cm, the welding current is 420A to 460A, the welding voltage is 42V to 46V, and the welding speed is 28mm / min to 55mm / min.

[0016] The beneficial effects of this application are as follows: This application reduces internal defects and significantly improves welding efficiency and quality by setting up a welding cooling system, thereby meeting the needs of high heat input welding of ultra-high strength steel thick plates for marine engineering with different cooling rates and different heat inputs. Attached Figure Description

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of a welding cooling system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the usage state of a welding cooling system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram showing the positions of the first cooling pad, the second cooling pad, and the steel plate to be welded. Figure 4 This is a schematic diagram of the structure of a first cooling pad provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a second cooling pad provided in an embodiment of the present invention; Figure 6 This is a block diagram illustrating a welding method provided in an embodiment of the present invention.

[0019] In the picture: 100. First cooling pad; 110. First cooling channel; 120. First forming groove; 130. Cooling medium inlet; 140. Cooling medium outlet; 200, Steel plate to be welded; 210, Non-welding surface; 220, Welding surface; 230, Bevel surface; 300, Second cooling pad; 310, Second cooling channel; 320, Second forming groove; 330, Cooling medium inlet; 340, Cooling medium outlet; 400. Stepper motor assembly; 410. First moving platform; 420. Second moving platform; 430. Linear guide rail; 500, backing block; 600, molten pool; 700, weld metal; 810. Welding torch; 820. Contact nozzle. Detailed Implementation

[0020] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Figure 1 This is a schematic diagram of a welding cooling system provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the welding cooling system in use according to an embodiment of the present invention. Figure 3 This is a schematic diagram showing the positions of the first cooling pad, the second cooling pad, and the steel plate to be welded. (Reference) Figures 1 to 3As shown, in one embodiment of this application, a welding cooling system is provided, including: a first cooling pad 100, a pad 500, a second cooling pad 300, a stepping motion assembly 400, and a controller.

[0024] The first cooling pad 100 is laid on the non-welding surface 210 of the steel plate 200 to be welded and completely covers the weld; wherein, the steel plate 200 to be welded is an FH420 steel plate; a first cooling channel 110 is formed inside the first cooling pad 100, and the first cooling channel 110 is filled with a first cooling medium; the liner block 500 is located on the welding surface 220 of the steel plate 200 to be welded; the second cooling pad 300 is located on the welding surface 220 of the steel plate 200 to be welded, and is located on the liner block 500. 00 is located on the side near the molten pool 600; a second cooling channel 310 is formed inside the second cooling pad 300; the second cooling channel 310 is filled with a second cooling medium; the stepping moving component 400 is connected to the liner 500 and the second cooling pad 300 respectively, and drives the liner 500 and the second cooling pad 300 to move in the vertical direction respectively; the controller is communicatively connected to the stepping moving component 400, and the controller is used to control the action of the stepping moving component 400.

[0025] Furthermore, the stepping motion component 400 includes: a first moving platform 410, a second moving platform 420, and a linear guide rail 430.

[0026] The first moving platform 410 is connected to the liner 500; the first moving platform 410 is communicatively connected to the controller; the second moving platform 420 is connected to the second cooling pad 300; the second moving platform 420 is communicatively connected to the controller; the linear guide rail 430 is arranged vertically, and the first moving platform 410 and the second moving platform 420 are movably connected to the linear guide rail 430.

[0027] Here, both the first moving platform 410 and the second moving platform 420 can be self-driven. The controller controls the movement of the first moving platform 410 and the second moving platform 420 to control the stepping position of the liner 500 and the second cooling pad 300.

[0028] In an alternative embodiment, it further includes an infrared imager and a speed sensor.

[0029] The infrared imager is mounted on the second mobile platform 420 and is positioned opposite to the molten pool 600; the infrared imager is communicatively connected to the controller; the speed sensor is mounted on the linear guide rail 430; the speed sensor is communicatively connected to the controller.

[0030] When the infrared imager collects the real-time temperature of the molten pool and it exceeds the preset value, it feeds back to the controller. The controller then controls the first moving platform 410 and the second moving platform 420 to reduce their moving speed synchronously until the real-time speed fed back by the speed sensor is within the target range.

[0031] When the infrared imager collects data on the real-time temperature of the molten pool, which is lower than a preset value, it feeds back to the controller. The controller then controls the first moving platform 410 and the second moving platform 420 to simultaneously increase their moving speed until the real-time speed fed back by the speed sensor is within the target range.

[0032] In an alternative embodiment, it further includes a flow sensor and a regulating valve.

[0033] The flow sensor is installed in the first cooling channel 110 and the second cooling channel 310; the flow sensor is communicatively connected to the controller; the regulating valve is installed in the first cooling channel 110 and the second cooling channel 310; the regulating valve is communicatively connected to the controller.

[0034] When the real-time temperature of the molten pool collected by the infrared imager exceeds the preset value, it is fed back to the controller. The controller controls to increase the opening of the regulating valve until the real-time flow rate fed back by the flow sensor is within the target range. When the real-time temperature of the molten pool is lower than the preset value, the controller controls to decrease the opening of the regulating valve until the real-time flow rate fed back by the flow sensor is within the target range.

[0035] In an alternative embodiment, a temperature sensor is also included.

[0036] The temperature sensors are respectively installed on the side of the first cooling pad 100 opposite to the weld metal 700 and the side of the second cooling pad 300 opposite to the weld metal 700.

[0037] When the temperature sensor detects that the real-time temperatures of the first cooling pad 100 and the second cooling pad 300 exceed a preset value, it feeds back to the controller. The controller then controls the opening of the regulating valve to increase until the real-time temperatures of the first cooling pad 100 and the second cooling pad 300 detected by the temperature sensor are within the target range.

[0038] When the temperature sensor detects that the real-time temperature of the first cooling pad 100 and the second cooling pad 300 is lower than a preset value, it feeds back to the controller. The controller then controls the opening of the regulating valve to decrease until the real-time temperature of the first cooling pad 100 and the second cooling pad 300 detected by the temperature sensor is within the target range.

[0039] In an alternative embodiment, it further includes an on / off switch.

[0040] The start / stop switch is installed at the end of the linear guide rail; when the start / stop switch detects that the liner 500 has entered the monitoring area of ​​the start / stop switch, it sends a feedback to the controller, and the controller controls the first moving platform 410 and the second moving platform 420 to stop moving synchronously.

[0041] In an optional embodiment, the first moving platform is connected to the liner block via a first telescopic rod, and the second moving platform is connected to the second telescopic rod of the second cooling liner; the first telescopic rod and the second telescopic rod are respectively communicatively connected to the controller. Specifically, it also includes a pressure sensor for collecting real-time pressure values ​​between the liner block and the weld.

[0042] When the pressure sensor detects a real-time pressure value lower than a set value, it sends a feedback signal to the controller. The controller then triggers the first telescopic rod to extend, moving the liner closer to the weld seam until the pressure sensor detects a real-time pressure value no less than the set value, at which point the first telescopic rod stops. Conversely, when the pressure sensor detects a real-time pressure value greater than the set value, it sends a feedback signal to the controller. The controller then triggers the first telescopic rod to retract, moving the liner away from the weld seam until the pressure sensor detects a real-time pressure value no more than the set value, at which point the first telescopic rod stops.

[0043] In this embodiment, by controlling the bonding pressure between the liner and the weld, the forced forming effect of the weld is ensured, and the situation of weld depression due to insufficient bonding pressure between the liner and the weld (or damage to the surface of the weldment due to excessive bonding pressure between the liner and the weld) is avoided.

[0044] Figure 4 This is a schematic diagram of the structure of a first cooling pad provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a second cooling pad provided in an embodiment of the present invention. (See reference) Figure 4 and Figure 5 As shown, a first forming groove 120 is formed at the center of the surface of the first cooling pad 100, and the first forming groove 120 is arranged opposite to the location of the weld; the width of the first forming groove 120 is 8mm to 12mm, and the depth of the first forming groove 120 is 2.4mm to 3.6mm; a second forming groove 320 is formed at the center of the surface of the second cooling pad 300, and the second forming groove 320 is arranged opposite to the location of the weld; the width of the second forming groove 320 is 40mm to 60mm, and the depth of the second forming groove 320 is 4mm to 6mm.

[0045] The first forming groove 120 on the first cooling pad 100 is mainly used for weld formation on the non-welding surface 210 side of the steel plate 200 to be welded. The second forming groove 320 on the second cooling pad 300 is mainly used for weld reinforcement across the welding surface side of the steel plate 200 to be welded. The weld formation on the welding surface side of the steel plate 200 to be welded is mainly completed by the liner block 500.

[0046] Furthermore, regarding the structure of the first cooling pad and the second cooling pad, it should be noted that the thickness of the first cooling pad 100 and the second cooling pad 300 are both 16mm to 24mm; the aperture of the first cooling channel 110 and the aperture of the second cooling channel 310 are both 8mm to 12mm.

[0047] Optionally, both the first cooling channel 110 and the second cooling channel 310 are arranged in a curved shape, which significantly extends the flow path of the cooling medium in the cooling liner, greatly improves the heat dissipation capacity of the cooling system, and achieves an efficient balance between cooling performance and space utilization.

[0048] A temperature-controlled water tank can be used for cooling medium circulation. The cooling medium temperature can be controlled within the range of 0℃ to 100℃, and the cooling medium flow rate can be adjusted from 10L / min to 50L / min. During the welding process, the cooling medium temperature and flow rate can be adjusted according to the required cooling effect, referring to the examples provided above, to control the cooling rate of the weld.

[0049] Regarding the arrangement of the cooling medium inlet 130 and cooling medium outlet 140 in the first cooling pad 100, it should be noted that if the weld metal is formed from bottom to top, the cooling medium inlet 130 is generally located below the first cooling pad 100, and the cooling medium outlet 140 is located above the first cooling pad 100. The cooling medium inlet 130 and cooling medium outlet 140 can be located on the same side of the first cooling pad 100, or they can be located on different sides of the first cooling pad 100.

[0050] Regarding the arrangement of the cooling medium inlet 330 and cooling medium outlet 340 in the second cooling pad 300, it should be noted that if the weld metal is formed from bottom to top, the cooling medium inlet 330 is generally located below the second cooling pad 300, and the cooling medium outlet 340 is located above the second cooling pad 300. The cooling medium inlet 330 and cooling medium outlet 340 can be located on the same side of the second cooling pad 300, or on different sides of the second cooling pad 300.

[0051] In one specific embodiment, the first cooling pad 100 is made of a thick copper plate with a side length of 400 mm and a thickness of 20 mm. Correspondingly, the first forming groove 120 has a width of 10 mm and a depth of 3 mm. The first forming groove 120 has a smooth transition and is arranged perpendicular to the opening direction.

[0052] In one specific embodiment, the second cooling pad 300 is made of a thick copper plate with a side length of 200 mm and a thickness of 20 mm. Correspondingly, the second forming groove 320 has a width of 50 mm and a depth of 5 mm. The second forming groove 320 has a smooth transition and is arranged perpendicular to the opening direction.

[0053] Figure 6 This is a block diagram illustrating a welding method according to an embodiment of the present invention. (Refer to...) Figure 6 As shown, the present invention also provides a welding method using the welding cooling system described above, comprising: In step S100, a bevel surface 230 is formed on the edge of the steel plate 200 to be welded, wherein the bevel angle is 16° to 24° and the gap is 4 mm to 10 mm. It should be noted that the line energy is directly proportional to the gap; the higher the line energy, the larger the gap, and vice versa.

[0054] In step S200, a first cooling pad 100 is laid along the entire length of the non-welding surface 210 of the steel plate 200 to be welded. A liner block 500 is placed on the welding surface 220 of the steel plate 200 to be welded, and a second cooling pad 300 is placed on the side of the liner block 500 near the molten pool 600. The liner block 500 and the second cooling pad 300 are respectively connected to the stepping moving assembly 400. (See reference here.) Figure 2 As shown, the welding torch 810 and the electrode nozzle 820 move from bottom to top, and the weld metal is formed from bottom to top accordingly. The side where the welding torch 810 and the electrode nozzle 820 are arranged is the welding surface, which is the side that the welder or welding equipment directly observes and operates. Correspondingly, the side opposite to the welding surface is the non-welding surface.

[0055] In step S300, welding is performed in a vertical welding position. During the welding process, the controller controls the stepping movement component 400 to move, thereby driving the liner 500 and the second cooling pad 300 to move in the vertical direction.

[0056] The welding parameters involved in this embodiment include: welding heat input of 200KJ / cm to 450KJ / cm, welding current of 420A to 460A, welding voltage of 42V to 46V, and welding speed of 28mm / min to 55mm / min. In step S400, after welding is completed, the ultrasonic probe performs flaw detection on the inside of the weld from the welding surface 220 and the non-welding surface 210 of the welded steel plate, respectively, and ensures that the flaw detection is qualified.

[0057] After passing the flaw detection, the welded steel plates were processed into mechanical test specimens using a saw. Following cooling by circulating water through the first cooling pad 100 and the second cooling pad 300, an impact test was conducted at -60℃. The test results showed that the average impact energy of the weld and heat-affected zone at -60℃ could reach over 60J. It is understandable that if coolant or liquid nitrogen were used instead of water as the cooling medium, the average impact energy could be even higher; however, this will not be elaborated upon here.

[0058] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0059] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A welding cooling system, characterized in that, include: A first cooling pad (100) is laid on the non-welding surface (210) of the steel plate (200) to be welded and completely covers the weld; wherein the steel plate (200) to be welded is an FH420 steel plate; a first cooling channel (110) is formed inside the first cooling pad (100), and the first cooling channel (110) is filled with a first cooling medium; a liner (500) is located on the welding surface (220) of the steel plate (200) to be welded; a second cooling pad (300) is located on the welding surface (220) of the steel plate (200) to be welded, and is located near the molten pool (600) of the liner (500). One side; a second cooling channel (310) is opened inside the second cooling pad (300); the second cooling channel (310) is filled with a second cooling medium; a stepping moving assembly (400) is connected to the pad (500) and the second cooling pad (300) respectively, and drives the pad (500) and the second cooling pad (300) to move in the vertical direction respectively; a controller is communicatively connected to the stepping moving assembly (400), and the controller is used to control the action of the stepping moving assembly (400); the stepping moving assembly (400) includes: a first moving platform (410), the first moving platform (410) and the... The system includes: a liner block (500) connected to the first moving platform (410) and the controller; a second moving platform (420) connected to the second cooling pad (300); the second moving platform (420) and the controller; a linear guide rail (430) arranged vertically, the first moving platform (410) and the second moving platform (420) being movably connected to the linear guide rail (430); and an infrared imager mounted on the second moving platform (420) and positioned opposite to the molten pool (600); the infrared imager and the controller being communicated with each other; and a measuring... Speed ​​sensor, the speed sensor is mounted on the linear guide (430); the speed sensor is communicatively connected to the controller; flow sensor, the flow sensor is mounted in the first cooling channel (110) and the second cooling channel (310); the flow sensor is communicatively connected to the controller; regulating valve, the regulating valve is mounted in the first cooling channel (110) and the second cooling channel (310); the regulating valve is communicatively connected to the controller; temperature sensor, the temperature sensor is mounted on the side of the first cooling pad (100) opposite to the weld metal (700) and the side of the second cooling pad (300) opposite to the weld metal (700), respectively.

2. The welding cooling system according to claim 1, characterized in that, Also includes: A start / stop switch is installed at the end of the linear guide rail. When the start / stop switch detects that the liner (500) has entered the monitoring area of ​​the start / stop switch, it sends a feedback to the controller, and the controller controls the first moving platform (410) and the second moving platform (420) to stop synchronously.

3. The welding cooling system according to claim 1 or 2, characterized in that, A first forming groove (120) is formed at the center of the surface of the first cooling pad (100), and the first forming groove (120) is arranged opposite to the location of the weld. The width of the first forming groove (120) is 8mm to 12mm, and the depth of the first forming groove (120) is 2.4mm to 3.6mm. A second forming groove (320) is formed at the center of the surface of the second cooling pad (300), and the second forming groove (320) is arranged opposite to the location of the weld. The width of the second forming groove (320) is 40mm to 60mm, and the depth of the second forming groove (320) is 4mm to 6mm.

4. The welding cooling system according to claim 3, characterized in that, The thickness of the first cooling pad (100) and the thickness of the second cooling pad (300) are both 16 mm to 24 mm; the aperture of the first cooling channel (110) and the aperture of the second cooling channel (310) are both 8 mm to 12 mm; wherein the first cooling channel (110) and the second cooling channel (310) are both arranged in a curved shape.

5. A welding method using the welding cooling system as described in any one of claims 1 to 4, characterized in that, The steps include: creating a bevel surface (230) on the edge of the steel plate (200) to be welded, wherein the bevel angle is 16° to 24° and the gap is 4mm to 10mm; laying a first cooling pad (100) along the entire non-welding surface (210) of the steel plate (200); setting a liner (500) on the welding surface (220) of the steel plate (200) to be welded; and setting a second cooling pad (300) on the side of the liner (500) near the molten pool (600). (500) and the second cooling pad (300) are respectively connected to the stepping moving component (400); welding is performed in a vertical welding position. During the welding process, the controller controls the stepping moving component (400) to move, thereby driving the pad (500) and the second cooling pad (300) to move in the vertical direction; after welding is completed, the ultrasonic probe performs flaw detection on the inside of the weld from the welding surface (220) and the non-welding surface (210) of the welding steel plate, respectively, and ensures that the flaw detection is qualified.

6. The welding method according to claim 5, characterized in that, The steps are performed in a vertical welding position. During the welding process, the controller controls the stepping movement component (400) to move, thereby driving the liner (500) and the second cooling pad (300) to move in the vertical direction. The welding heat input is 200KJ / cm to 450KJ / cm, the welding current is 420A to 460A, the welding voltage is 42V to 46V, and the welding speed is 28mm / min to 55mm / min.

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