Welding cooling system and welding method

Abstract

The invention discloses a welding cooling system and a welding method. The welding cooling system comprises a first cooling liner, a filler block, a second cooling liner, a stepping moving assembly and a controller. The whole first cooling liner is laid on the non-welding surface of the steel plate to be welded and completely covers a welding seam; wherein the steel plate to be welded is an FH420 steel plate; a first cooling flow channel is formed in the first cooling liner, and the first cooling flow channel is filled with a first cooling medium; the filler block is positioned on the welding surface of the to-be-welded steel plate; the second cooling gasket is located on the welding surface of the to-be-welded steel plate and located on the side, close to the weld pool, of the filler block; a second cooling flow channel is formed in the second cooling liner; the second cooling flow channel is filled with a second cooling medium; the stepping moving assembly is connected with the filler block and the second cooling liner and drives the filler block and the second cooling liner to move in the vertical direction. And the controller is in communication connection with the stepping moving assembly, and the controller is used for controlling the action of the stepping moving assembly.

Description

Technical Field

[0001] The present application relates to the field of marine engineering technology, and in particular to a welding cooling system and a welding method for high-energy-input welding. Background Art

[0002] In the construction of offshore engineering structures, thick plates with a thickness of 40 mm or more and a strength grade of 400 MPa or higher, such as FH420 steel plates, are widely used. These plates also have stringent toughness requirements, requiring an average impact energy of no less than 28 J at -60°C. Currently, CO2 gas shielded welding and submerged arc welding are the primary methods used to weld these plates, with heat input generally controlled below 50 kJ / cm.

[0003] However, existing welding technologies still have significant shortcomings. First, high-energy-input welding methods like conventional vertical gas-electric welding and FCB welding, used to weld thick ultra-high-strength steel plates (such as FH420), make it difficult for welded joints to meet -60°C impact performance standards. Second, CO2 gas shielded welding or submerged arc welding (SAW) is inefficient and time-consuming for thick plates. Third, both methods are prone to internal defects, with CO2 gas shielded welding, due to the numerous passes involved, leading to particularly prominent issues such as slag inclusions and lack of fusion within the weld.

[0004] In summary, the field of thick plate welding in marine engineering urgently needs to overcome technical bottlenecks in order to meet the needs of high-quality and efficient construction of marine engineering structures. Summary of the Invention

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

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

[0007] Preferably, the stepping movement component comprises: a first mobile platform, the first mobile platform being connected to the pad; the first mobile platform being in communication with the controller; a second mobile platform connected to the second cooling pad; the second mobile platform being in communication with the controller; A linear guide rail is arranged in a vertical direction, and the first movable platform and the second movable platform are movably connected to the linear guide rail.

[0008] Preferably, it also includes: an infrared imager, the infrared imager being mounted on the second mobile platform and disposed opposite to the molten pool; the infrared imager being in communication with the controller; A speed sensor is mounted on the linear guide rail; the speed sensor is in communication with the controller; When the real-time temperature of the molten pool collected by the infrared imager exceeds a preset value, the temperature is fed back to the controller, and the controller controls the first mobile platform and the second mobile platform to synchronously reduce the moving speed until the real-time speed fed back by the speed sensor is within the target range; When the real-time temperature of the molten pool collected by the infrared imager is lower than a preset value, the temperature is fed back to the controller, and the controller controls the first mobile platform and the second mobile platform to synchronously increase the moving speed until the real-time speed fed back by the speed sensor is within the target range.

[0009] Preferably, it also includes: A flow sensor, the flow sensor being installed in the first cooling channel and the second cooling channel; the flow sensor being in communication with the controller; a regulating valve, the regulating valve being installed in the first cooling channel and the second cooling channel; the regulating valve being in communication with the controller; When the real-time temperature of the molten pool collected by the flow sensor exceeds a preset value, the controller is fed back to the controller, and 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 or exceeds a preset value, the controller controls to reduce 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 also includes: temperature sensors, the temperature sensors being mounted on a side of the first cooling pad opposite to the weld metal and a side of the second cooling pad opposite to the weld metal; When the real-time temperatures of the first cooling pad and the second cooling pad collected by the temperature sensor exceed a preset value, the temperature sensor feeds back to the controller, and the controller controls the opening of the regulating valve to increase until the real-time temperatures of the first cooling pad and the second cooling pad collected by the temperature sensor are within a target range; When the real-time temperatures of the first cooling pad and the second cooling pad collected by the temperature sensor are lower than a preset value, the temperature sensor feeds back to the controller, and the controller controls to reduce the opening of the regulating valve until the real-time temperatures of the first cooling pad and the second cooling pad collected by the temperature sensor are within the target range.

[0011] Preferably, it also includes: A start-stop switch is installed at the end of the linear track; when the start-stop switch detects that the pad has entered the monitoring area of the start-stop switch, it provides feedback to the controller, and the controller controls the first mobile platform and the second mobile platform to stop synchronously.

[0012] Preferably, a first forming groove is opened at the center position of the surface of the first cooling pad, and the first forming groove is arranged opposite to the position 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 opened at the center position of the surface of the second cooling pad, and the second forming groove is arranged opposite to the position 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 16mm to 24mm; the aperture of the first cooling channel and the aperture of the second cooling channel are both 8mm to 12mm; 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 the present application, a welding method using the welding cooling system as described above is provided, comprising the steps of: A groove is formed on the edge of the steel plate to be welded, wherein the groove angle is 16° to 24° and the gap is 4 mm to 10 mm; A first cooling pad is laid on the entire non-welding surface of the steel plate to be welded, a lining block is provided on the welding surface of the steel plate to be welded, and a second cooling pad is provided on the side of the lining block close to the molten pool, wherein the lining block and the second cooling pad are respectively connected to a stepping moving assembly; Welding is performed in a vertical welding position, and during the welding process, the controller controls the movement of the stepping moving assembly, thereby driving the liner and the second cooling pad to move in the vertical direction; After welding is completed, the ultrasonic probe is used to detect flaws inside the weld from the welding surface and non-welding surface of the welded steel plate, and ensure that the flaw detection is qualified.

[0015] Preferably, the step adopts a vertical welding position for welding. During the welding process, the controller controls the movement of the stepping moving component, thereby driving the lining block and the second cooling pad to move vertically. 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: 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-energy line welding of ultra-high-strength steel thick plates with different cooling rates and different heat inputs in marine engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is further described in detail below with reference to the accompanying drawings and examples.

[0018] Figure 1 A schematic structural diagram of a welding cooling system provided in one embodiment of the present invention; Figure 2 A schematic diagram of a welding cooling system in use according to an embodiment of the present invention; Figure 3 Schematic diagram of the positions between the first cooling pad, the second cooling pad and the steel plate to be welded; Figure 4 A schematic structural diagram of a first cooling pad provided in one embodiment of the present invention; Figure 5 A schematic structural diagram of a second cooling pad provided in one embodiment of the present invention; Figure 6 A block diagram of a welding method provided in accordance with 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, groove surface; 300, second cooling pad; 310, second cooling channel; 320, second forming groove; 330, cooling medium inlet; 340, cooling medium outlet; 400, stepping moving assembly; 410, first moving platform; 420, second moving platform; 430, linear guide rail; 500, lining block; 600, molten pool; 700, weld metal; 810. Welding gun; 820. Contact nozzle. DETAILED DESCRIPTION

[0020] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0021] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] Figure 1 This is a schematic structural diagram of a welding cooling system provided by an embodiment of the present invention. Figure 2 This is a schematic diagram of the use status of the welding cooling system provided by one embodiment of the present invention. Figure 3 The diagram below shows the positions of the first cooling pad, the second cooling pad and the steel plate to be welded. Figures 1 to 3As shown, in one embodiment of the present application, a welding cooling system is provided, including: a first cooling pad 100, a backing block 500, a second cooling pad 300, a stepping moving 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 provided inside the first cooling pad 100, and the first cooling channel 110 is filled with a first cooling medium; the liner 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 between the liner 500 and the liner 500; 00 is located on one side close to the molten pool 600; a second cooling channel 310 is opened inside the second cooling pad 300; a second cooling channel 310 is filled with a second cooling medium; the stepping moving component 400 is respectively connected to the liner 500 and the second cooling pad 300, and respectively drives the liner 500 and the second cooling pad 300 to move in the vertical direction; the controller is communicated with the stepping moving component 400, and the controller is used to control the action of the stepping moving component 400.

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

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

[0027] Here, both the first movable platform 410 and the second movable platform 420 can be self-driven, and the controller controls the stepping position of the liner 500 and the second cooling pad 300 by controlling the movements of the first movable platform 410 and the second movable platform 420 .

[0028] In an optional embodiment, it also includes: an infrared imager and a speed sensor.

[0029] The infrared imager is mounted on the second mobile platform 420 and is arranged 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 real-time temperature of the molten pool collected by the infrared imager exceeds a preset value, the temperature is fed back to the controller, and the controller controls the first mobile platform 410 and the second mobile platform 420 to synchronously reduce the moving speed until the real-time speed fed back by the speed sensor is within the target range.

[0031] When the real-time temperature of the molten pool collected by the infrared imager is lower than a preset value, the temperature is fed back to the controller, and the controller controls the first mobile platform 410 and the second mobile platform 420 to increase the moving speed synchronously until the real-time speed fed back by the speed sensor is within the target range.

[0032] In an optional 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 flow sensor exceeds a preset value, the controller is fed back to the controller, and 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 or exceeds a preset value, the controller controls to reduce 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 optional embodiment, it further includes: a temperature sensor.

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

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

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

[0039] In an optional embodiment, it also includes: a start-stop switch.

[0040] The start-stop switch is installed at the end of the linear track; when the start-stop switch detects that the pad 500 enters the monitoring area of the start-stop switch, it feeds back to the controller, and the controller controls the first mobile platform 410 and the second mobile platform 420 to stop synchronously.

[0041] In an optional embodiment, the first mobile platform is connected to the backing block via a first telescopic rod, and the second mobile platform is connected to a second telescopic rod of the second cooling pad; the first telescopic rod and the second telescopic rod are each in communication with the controller. The system further includes a pressure sensor for collecting real-time pressure between the backing block and the weld.

[0042] When the real-time pressure value of the pressure sensor is less than the set value, the controller is fed back to the controller, which triggers the first telescopic rod to extend, causing the pad to move toward the weld. The first telescopic rod stops moving when the real-time pressure value collected by the pressure sensor is no less than the set value. When the real-time pressure value of the pressure sensor is greater than the set value, the controller is fed back to the controller, which triggers the first telescopic rod to shorten, causing the pad to move away from the weld. The first telescopic rod stops moving when the real-time pressure value collected by the pressure sensor is no greater than the set value.

[0043] In this embodiment, the fitting pressure between the backing block and the weld is controlled to ensure the forced forming effect of the weld, thereby avoiding the situation where the weld is concave due to insufficient fitting pressure between the backing block and the weld (or the weld surface is damaged due to excessive fitting pressure between the backing block and the weld).

[0044] Figure 4 A schematic structural diagram of a first cooling pad provided in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the second cooling pad provided by one embodiment of the present invention. Figure 4 and Figure 5 As shown, a first molding groove 120 is opened at the center position of the surface of the first cooling pad 100, and the first molding groove 120 is arranged opposite to the position of the weld; the width of the first molding groove 120 is 8mm to 12mm, and the depth of the first molding groove 120 is 2.4mm to 3.6mm; a second molding groove 320 is opened at the center position of the surface of the second cooling pad 300, and the second molding groove 320 is arranged opposite to the position of the weld; the width of the second molding groove 320 is 40mm to 60mm, and the depth of the second molding groove 320 is 4mm to 6mm.

[0045] The first forming groove 120 on the first cooling pad 100 is primarily used to form the weld seam on the non-welding surface 210 of the steel plate 200 to be welded. The second forming groove 320 on the second cooling pad 300 is primarily used to form the weld seam reinforcement across the welding surface of the steel plate 200 to be welded. The weld seam on the welding surface of the steel plate 200 to be welded is primarily formed by the backing 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 thickness of 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, the first cooling channel 110 and the second cooling channel 310 are both 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 to circulate the cooling medium. The cooling medium temperature can be controlled from 0°C to 100°C, and the cooling medium flow rate can be adjusted from 10L / min to 50L / min. During welding, the cooling medium temperature and flow rate can be adjusted according to the desired cooling effect, referring to the above examples to achieve the desired cooling rate of the weld.

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

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

[0051] In one 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. Accordingly, 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 direction of the opening.

[0052] In one 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. Accordingly, the second forming groove 320 is 50 mm wide and 5 mm deep. The second forming groove 320 has a smooth transition and is arranged perpendicular to the opening direction.

[0053] Figure 6 A schematic block diagram of a welding method according to an embodiment of the present invention is provided. Figure 6 As shown, the present invention also provides a welding method using the welding cooling system as described above, comprising: In step S100, a groove surface 230 is formed on the edge of the steel plate 200 to be welded. The groove angle is 16° to 24°, and the gap is 4 mm to 10 mm. It should be noted that the heat input and the gap are directly proportional. The higher the heat input, the larger the gap. Conversely, the lower the heat input, the smaller the gap.

[0054] Step S200: a first cooling pad 100 is laid on the entire non-welding surface 210 of the steel plate 200 to be welded, a backing block 500 is set on the welding surface 220 of the steel plate 200 to be welded, and a second cooling pad 300 is set on the side of the backing block 500 close to the molten pool 600. The backing block 500 and the second cooling pad 300 are respectively connected to the stepping moving assembly 400. Figure 2 As shown, welding gun 810 and conductive nozzle 820 move from bottom to top, and weld metal forms accordingly. The side where welding gun 810 and conductive nozzle 820 are located is the welding surface, the side directly observed and operated by the welder or welding equipment. Correspondingly, the side opposite 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 moving assembly 400 to move, thereby driving the liner 500 and the second cooling pad 300 to move in a vertical direction.

[0056] The welding parameters involved in this embodiment include: welding heat input of 200KJ / cm2 to 450KJ / cm2, welding current of 420A to 460A, welding voltage of 42V to 46V, welding speed of 28mm / min to 55mm / min. Step S400: After welding is completed, the ultrasonic probe is used to detect flaws inside the weld from the welding surface 220 and the non-welding surface 210 of the welded steel plate, respectively, and ensure that the flaw detection is qualified.

[0057] After passing flaw detection, welded steel plates were processed using a sawing machine for mechanical testing. After cooling with water flowing through the first and second cooling pads 100 and 300, impact tests were conducted at -60°C. The test results showed that the average impact energy of the weld and heat-affected zone at -60°C could reach over 60J. It is understood that if the cooling medium is not water, but rather a coolant or liquid nitrogen, the average impact energy can be even higher. This is not detailed here.

[0058] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other positions or relationships are used solely for ease of description and simplified operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0059] In this specification, reference to terms such as "one embodiment" or "example" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0060] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0061] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the present application and are not to be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present application without inventive effort, and such implementations will fall within the scope of protection of the present application.

Claims

1. A welding cooling system, characterized in that: include: A first cooling pad (100), the first cooling pad (100) being laid on a non-welding surface (210) of a steel plate (200) to be welded and completely covering a weld; wherein the steel plate (200) to be welded is an FH420 steel plate; a first cooling channel (110) is provided inside the first cooling pad (100), and the first cooling channel (110) is filled with a first cooling medium; A lining block (500), the lining block (500) being located on the welding surface (220) of the steel plate (200) to be welded; a second cooling pad (300), the second cooling pad (300) being located on the welding surface (220) of the steel plate (200) to be welded and on a side of the liner (500) close to the molten pool (600); a second cooling channel (310) being provided inside the second cooling pad (300); and a second cooling medium being filled in the second cooling channel (310); a stepping moving assembly (400), wherein the stepping moving assembly (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 a vertical direction respectively; A controller is communicatively connected to the step-by-step moving component (400), and the controller is used to control the movement of the step-by-step moving component (400).

2. The welding cooling system according to claim 1, characterized in that: The stepping moving component (400) comprises: a first mobile platform (410), the first mobile platform (410) being connected to the pad (500); the first mobile platform (410) being in communication with the controller; a second mobile platform (420), the second mobile platform (420) being connected to the second cooling pad (300); the second mobile platform (420) being in communication connection with the controller; A linear guide rail (430) is arranged in a vertical direction, and the first movable platform (410) and the second movable platform (420) are movably connected to the linear guide rail (430).

3. The welding cooling system according to claim 2, characterized in that: Also includes: an infrared imager, the infrared imager being mounted on the second mobile platform (420) and arranged opposite to the molten pool (600); the infrared imager being in communication with the controller; A speed sensor, the speed sensor being mounted on the linear guide rail (430); the speed sensor being in communication connection with the controller; When the real-time temperature of the molten pool collected by the infrared imager exceeds a preset value, the temperature is fed back to the controller, and the controller controls the first mobile platform (410) and the second mobile platform (420) to synchronously reduce the moving speed until the real-time speed fed back by the speed sensor is within the target range; When the real-time temperature of the molten pool collected by the infrared imager is lower than a preset value, the temperature is fed back to the controller, and the controller controls the first mobile platform (410) and the second mobile platform (420) to synchronously increase the moving speed until the real-time speed fed back by the speed sensor is within the target range.

4. The welding cooling system according to claim 3, characterized in that: Also includes: a flow sensor, the flow sensor being installed in the first cooling channel (110) and the second cooling channel (310); the flow sensor being communicatively connected to the controller; a regulating valve, the regulating valve being installed in the first cooling channel (110) and the second cooling channel (310); the regulating valve being in communication connection with the controller; When the real-time temperature of the molten pool collected by the flow sensor exceeds a preset value, the controller is fed back to the controller, and 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 or exceeds a preset value, the controller controls to reduce the opening of the regulating valve until the real-time flow rate fed back by the flow sensor is within the target range.

5. The welding cooling system according to claim 4, characterized in that: Also includes: temperature sensors, the temperature sensors being respectively mounted on a side of the first cooling pad (100) opposite to the weld metal (700) and a side of the second cooling pad (300) opposite to the weld metal (700); When the real-time temperatures of the first cooling pad (100) and the second cooling pad (300) collected by the temperature sensor exceed a preset value, the real-time temperatures are fed back to the controller, and the controller controls the increase of the opening of the regulating valve until the real-time temperatures of the first cooling pad (100) and the second cooling pad (300) collected by the temperature sensor are within a target range; When the real-time temperatures of the first cooling pad (100) and the second cooling pad (300) collected by the temperature sensor are lower than a preset value, the temperature sensor feeds back to the controller, and the controller controls the reduction of the opening of the regulating valve until the real-time temperatures of the first cooling pad (100) and the second cooling pad (300) collected by the temperature sensor are within a target range.

6. The welding cooling system according to claim 2, characterized in that: Also includes: A start-stop switch, the start-stop switch being installed at the rear end of the linear track; When the start-stop switch detects that the pad (500) enters the monitoring area of the start-stop switch, feedback is sent to the controller, and the controller controls the first mobile platform (410) and the second mobile platform (420) to stop synchronously.

7. The welding cooling system according to any one of claims 1 to 6, characterized in that: A first forming groove (120) is provided at a central position on the surface of the first cooling pad (100), and the first forming groove (120) is arranged opposite to the position of the weld; the width of the first forming groove (120) is 8 mm to 12 mm, and the depth of the first forming groove (120) is 2.4 mm to 3.6 mm; a second forming groove (320) is provided at a central position on the surface of the second cooling pad (300), and the second forming groove (320) is arranged opposite to the position of the weld; the width of the second forming groove (320) is 40 mm to 60 mm, and the depth of the second forming groove (320) is 4 mm to 6 mm.

8. The welding cooling system according to claim 7, 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.

9. A welding method using the welding cooling system according to any one of claims 1 to 8, characterized in that: Including steps: A groove surface (230) is formed on the edge of the steel plate (200) to be welded, wherein the groove angle is 16° to 24° and the gap is 4mm to 10mm; A first cooling pad (100) is laid on the entire non-welding surface (210) of the steel plate (200) to be welded, a lining block (500) is provided on the welding surface (220) of the steel plate (200) to be welded, and a second cooling pad (300) is provided on a side of the lining block (500) close to the molten pool (600), the lining block (500) and the second cooling pad (300) are respectively connected to a stepping moving assembly (400); Welding is performed in a vertical welding position, and during the welding process, the controller controls the movement of the stepping moving assembly (400), thereby driving the lining block (500) and the second cooling pad (300) to move in a vertical direction; After welding is completed, the ultrasonic probe is used to detect flaws inside 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.

10. The welding method according to claim 9, characterized in that: The step adopts a vertical welding position for welding. During the welding process, the controller controls the movement of the stepping moving component (400), thereby driving the lining block (500) and the second cooling pad (300) to move vertically. 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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