Pipeline welding equipment and method

Abstract

The invention provides pipeline welding equipment and method. The pipeline welding equipment comprises a rotating device, a welding gun and an air cooling device, the rotating device is used for being connected with a pipeline provided with an annular joint and driving the pipeline to pivot, the welding gun is used for being arranged opposite to the annular joint and welding the annular joint, and the air cooling device is used for stretching into the pipeline and blowing air towards the annular joint to cool. According to the pipeline welding equipment, the rotating device and the welding gun are matched to weld the annular joint, and the air cooling device blows air towards the annular joint in the welding process to cool the annular joint, so that the temperature between channels is prevented from being too high, and the pipeline welding equipment has high welding efficiency and welding quality.

Description

Technical Field

[0001] This invention relates to the field of welding, and more specifically to a pipe welding device and method. Background Technology

[0002] In related technologies, it is difficult to control the interpass temperature during the welding process of circumferential welds in pipelines of equipment such as nuclear power units. This can lead to quality problems such as hot cracking and porosity due to excessively high interpass temperatures, which affects the pipeline's pass rate. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention provide a pipe welding device and method.

[0005] The pipe welding equipment of this invention includes: The system includes a rotating device, a welding torch, and an air cooling device. The rotating device is used to connect to a pipe with an annular joint and drive the pipe to pivot. The welding torch is used to be positioned opposite the annular joint and to weld the annular joint. The air cooling device is used to extend into the interior of the pipe and blow gas toward the annular joint to cool it down.

[0006] The pipe welding equipment of this invention uses a rotating device and a welding torch to weld annular joints. During the welding process, the air cooling device blows gas toward the annular joint to cool it down, thereby avoiding excessively high interpass temperatures and achieving high welding efficiency and quality.

[0007] In some embodiments, the air cooling device includes a nozzle and an air supply component. The air supply component is connected to the nozzle via a pipeline to supply air to the nozzle. The nozzle is provided with a nozzle orifice and is used to extend into the interior of the pipeline and orifice toward the annular joint so that the gas ejected from the nozzle orifice passes through the annular joint to be cooled.

[0008] In some embodiments, one end of the nozzle is provided with an interface for connecting to the pipeline, and the other end of the nozzle is flared and has a plurality of nozzles distributed on its end face. The nozzle is used to extend into the interior of the pipeline and is arranged at intervals along the axial direction of the pipeline with respect to the annular joint, and the other end of the nozzle faces the annular joint.

[0009] In some embodiments, the pipe welding equipment further includes a seal for connecting to one end of the pipe and sealing the opening at one end of the pipe, while the opening at the other end of the pipe is open. The air-cooling device extends through the seal into the interior of the pipe and is located on the side of the annular joint facing one end of the pipe, so that the gas blown by the air-cooling device passes through the annular joint to cool it.

[0010] In some embodiments, the rotating device includes chucks and a frame arranged at intervals, the frame being used to support one end of the pipe so that the air-cooling device extends into one end of the pipe, and the chucks connecting to the other end of the pipe and driving the pipe to pivot.

[0011] In some embodiments, the pipe welding equipment further includes a temperature sensor arranged radially at intervals along the pipe and opposite to the annular joint, the temperature sensor being used to contact the weld at the annular joint to detect the interpass temperature.

[0012] The pipe welding method of this invention includes: Insert the air-cooling device into the inside of the pipe with an annular joint; Then, the annular joint is submerged arc welded using a welding torch, and a gas cooling device blows gas into the annular joint to cool it down during the submerged arc welding process.

[0013] The pipe welding method of this invention uses a gas cooling device to blow gas toward the annular joint during submerged arc welding to cool it down, thereby avoiding excessively high interpass temperatures and achieving high welding quality and efficiency.

[0014] In some embodiments, a temperature sensor is provided opposite to the annular joint before submerged arc welding is performed on the annular joint. During the submerged arc welding process, the temperature sensor contacts the weld at the annular joint and detects the interpass temperature. The welding torch operates and pauses according to the interpass temperature detected by the temperature sensor, and / or the air cooling device adjusts the flow rate of the blowing gas according to the interpass temperature detected by the temperature sensor so that the interpass temperature is between 10°C and 177°C.

[0015] In some embodiments, during submerged arc welding, when the interpass temperature detected by the temperature sensor is 167°C to 172°C, the welding torch is paused; when the interpass temperature drops to 145°C to 155°C, the welding torch resumes operation.

[0016] In some embodiments, the pipe welding method further includes: Preheat the portion of the pipe along the axial direction from 90mm to 110mm on one side of the annular joint to 90mm to 110mm on the other side of the annular joint, with a preheating temperature of 10℃ to 20℃. Then, perform argon arc welding on the annular joint to form two to three layers of root pass, with each layer having no more than two passes. The heat input of the root pass should not exceed 20 KJ / cm. Then the air-cooling device is inserted into the pipe with an annular joint; Then, the annular joint is submerged arc welded using a welding torch. The diameter of the welding wire used in submerged arc welding is 1.6 mm to 3.2 mm, and the welding speed is 20 cm / min to 50 cm / min. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a pipe welding device according to an embodiment of the present invention.

[0018] Figure label: 1. Rotating device; 11. Chuck; 12. Fixture; 2. Welding torch; 3. Air cooling device; 31. Nozzle; 311. Nozzle port; 312. Interface; 4. Pipe; 41. Circular joint; 5. Seal; 6. Temperature sensor; 7. Control box. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] The following is for reference. Figure 1 This invention describes a pipe welding apparatus and method according to embodiments of the present invention.

[0021] like Figure 1 As shown, the pipe welding equipment of this embodiment includes a rotating device 1, a welding torch 2, and an air cooling device 3.

[0022] Rotating device 1 is used to connect pipe 4 with an annular joint 41 and drive pipe 4 to rotate axially (e.g. Figure 1 (As shown in the left and right directions) can pivot, and the annular joint 41 extends circumferentially along the pipe 4 and is located between two adjacent pipe sections of the pipe 4.

[0023] The welding torch 2 is used to be positioned opposite to the annular joint 41 and to weld the annular joint 41 to weld two adjacent pipe sections of the pipe 4 together.

[0024] The air-cooling device 3 is used to extend into the interior of the pipe 4 and spray gas toward the annular joint 41 to cool it down. It should be noted that the air-cooling device 3 spraying gas toward the annular joint 41 means that the gas sprayed by the air-cooling device 3 will pass through the annular joint 41, thereby controlling the inter-channel temperature to avoid the inter-channel temperature from being too high.

[0025] The pipe welding equipment of this invention uses a rotating device 1 and a welding torch 2 to weld annular joints 41. During the welding process, the air cooling device 3 blows gas toward the annular joints 41 to cool them down, thereby avoiding excessively high interpass temperatures and achieving high welding efficiency and welding quality.

[0026] In some embodiments, such as Figure 1 As shown, the air cooling device 3 includes a nozzle 31 and an air supply component (not shown in the figure). The air supply component can be an air pump or a pressure vessel for storing gas. The air supply component is connected to the nozzle 31 through a pipeline to supply gas to the nozzle 31. The nozzle 31 is provided with a nozzle 311 to spray out the received gas. The air supply component is used to be located outside the pipeline. The nozzle 31 is used to extend into the interior of the pipeline 4 and to make the nozzle 311 face the annular joint 41 so that the gas sprayed from the nozzle 311 passes through the annular joint 41 to be cooled.

[0027] In some embodiments, such as Figure 1 As shown, one end of the nozzle 31 (such as...) Figure 1 The left end of the nozzle 31 shown is provided with an interface 312 for connecting to the pipeline, and the other end of the nozzle 31 (as shown) Figure 1 The right end of the nozzle 31 shown is flared and has multiple nozzles 311 distributed on its end face. In other words, the cross-sectional area of ​​the inner cavity at the right end of the nozzle 31 increases from left to right, and multiple nozzles 311 are distributed on the right end face of the nozzle 31.

[0028] The nozzle 31 is used to extend into the interior of the pipe 4 and is arranged at intervals along the axial direction of the annular joint 41. The other end of the nozzle 31 faces the annular joint 41. The gas ejected from the multiple nozzles 311 fills the inner cavity of the pipe 4 along the cross-sectional direction of the pipe 4, and then flows from left to right along the axial direction of the pipe 4 and passes through the annular joint 41 located downstream, thereby cooling and controlling the inter-channel temperature.

[0029] The nozzle 31 can be made of silicone.

[0030] In some embodiments, such as Figure 1 As shown, the pipe welding equipment also includes a seal 5, which is used to connect to one end of the pipe 4 (e.g., Figure 1 The left end of pipe 4 (as shown) and the opening of one end of pipe 4 is closed. The sealing element 5 can be a sealing cap or a sealing plug to cover or plug the opening, thereby sealing it. The other end of pipe 4 (such as...) Figure 1 The right end of pipe 4 (as shown) has an open port.

[0031] The air-cooling device 3 passes through the seal 5 to extend into the interior of the pipe 4. Optionally, the seal 5 is provided with a through hole for passing through the nozzle 31 or a pipe connecting the nozzle 31 and the air supply device, so that the air-cooling device 3 passes through the seal 5 to extend into the interior of the pipe 4. Thus, the seal 5 is set as annular.

[0032] The portion of the air-cooling device 3 that extends into the pipe 4 can be configured such that the nozzle 31 is located on one side of the annular joint 41 facing the end of the pipe 4 (e.g., Figure 1 (As shown on the left side of the annular joint 41), under the sealing effect of the seal 5, the gas sprayed by the nozzle 31 flows from left to right along the pipe 4 and passes through the annular joint 41 to cool down, and then is discharged from the open pipe at the right end of the pipe 4. This avoids the gas sprayed by the nozzle 31 flowing back without passing through the annular joint 41, resulting in no cooling effect, and also avoids the gas flowing back after passing through the annular joint 41 to heat up, causing the gas that did not reach the annular joint 41 to heat up and thus reduce the cooling effect.

[0033] In some embodiments, such as Figure 1 As shown, the rotating device 1 includes chucks 11 and a frame 12 arranged at intervals in the left-right direction. The frame 12 is used to support one end of the pipe 4 (e.g., Figure 1 The left end of the pipe 4 is shown, so that the nozzle 31 of the air-cooling device 3 extends into one end of the pipe 4, and the chuck 11 connects to the other end of the pipe 4 (as shown). Figure 1 (The right end of pipe 4 shown) and drive pipe 4 to pivot around its axis.

[0034] Optionally, the two adjacent pipe sections of the pipe 4 are subjected to root pass welding before being placed in the rotating device 1, so that the two adjacent pipe sections of the pipe 4 rotate synchronously under the drive of the chuck 11, thereby facilitating the welding torch 2 to weld the two adjacent pipe sections completely, so that the left end of the pipe 4 can be pivotally mounted on the jig 12.

[0035] It is understood that the two adjacent pipe sections of pipe 4 are not limited to being pre-welded. In other embodiments, the two adjacent pipe sections of pipe 4 can also be connected by supports or connectors.

[0036] Optionally, there is a gap between the chuck 11 and the right end of the pipe 4 so that the right end of the pipe 4 is open, thereby allowing the internal gas to be discharged.

[0037] In some embodiments, the pipe welding equipment further includes a control box 7 and a welding machine. The welding machine is located inside the control box 7 and connected to the welding torch 2. The welding torch 2 can be handheld or mounted on a mounting frame. The mounting frame can be connected to the control box 7 or located on the ground. Optionally, the welding torch 2 can be mounted on the mounting frame.

[0038] The chuck 11 includes a movable jaw, a chuck body, and a driver connected sequentially from left to right. The driver is located inside the control box 7. The chuck body is pivotally connected to the wall of the control box 7. The movable jaw is used to clamp and release the pipe 4. The driver is used to drive the chuck body to pivot in the left and right directions and to drive the movable jaw to move.

[0039] In some embodiments, the pipe welding equipment further includes a temperature sensor 6, which is arranged radially at intervals with the welding torch 2 along the pipe 4 and is positioned opposite to the annular joint 41. Optionally, the welding torch 2 is located above the annular joint 41, and the temperature sensor 6 is mounted on a bracket on the ground and located below the annular joint 41. The temperature sensor 6 is used to contact the weld at the annular joint 41 to detect the interpass temperature. Since the temperature sensor 6 and the welding torch 2 are arranged radially at intervals along the pipe 4, they can be protected from damage caused by the high temperature generated during welding.

[0040] The following is for reference. Figure 1 This invention describes a pipe welding method according to an embodiment of the invention.

[0041] It should be noted that the pipe welding method in this embodiment of the invention may be implemented, but is not limited to, the pipe welding equipment based on this embodiment of the invention.

[0042] The pipe welding method of this invention includes: inserting an air cooling device 3 into the interior of a pipe 4 having an annular joint 41; then performing submerged arc welding on the annular joint 41 using a welding torch 2; and during the submerged arc welding process, the air cooling device 3 sprays gas onto the annular joint 41 to cool it down.

[0043] The pipe welding method of this invention uses a gas cooling device 3 to spray gas toward the annular joint 41 during the submerged arc welding process to cool it down, thereby avoiding excessively high interpass temperatures and achieving high welding quality and efficiency.

[0044] In some embodiments, such as Figure 1 As shown, a temperature sensor 6 is set opposite to the annular joint 41 before submerged arc welding of the annular joint 41. Optionally, the temperature sensor 6 is mounted on a bracket on the ground and arranged radially at intervals with the welding torch 2 along the pipe 4. The welding torch 2 may be located above the annular joint 41 and the temperature sensor 6 may be located below the annular joint 41.

[0045] During submerged arc welding, temperature sensor 6 contacts the weld seam at the annular joint 41 and detects the interpass temperature. Welding torch 2 operates and pauses according to the interpass temperature detected by temperature sensor 6, and / or, air cooling device 3 adjusts the flow rate of the blown gas according to the interpass temperature detected by temperature sensor 6. Optionally, welding torch 2 operates and pauses according to the interpass temperature detected by temperature sensor 6, and air cooling device 3 adjusts the flow rate of the blown gas according to the interpass temperature detected by temperature sensor 6, so that the interpass temperature is between 10℃ and 177℃.

[0046] Optionally, the welding gun 2 is connected to both the welding machine and the temperature sensor 6, which are electrically connected to the terminal. The terminal controls the start and stop of the welding machine based on the interpass temperature transmitted by the temperature sensor 6, thereby enabling the welding gun 2 to run and pause.

[0047] Optionally, the air-cooling device 3 includes a nozzle 31 and an air supply component. The nozzle 31 is used to extend into the interior of the pipe 4. The air supply component and the temperature sensor 6 are both electrically connected to the terminal. The terminal controls the opening degree or power of the air supply component according to the inter-channel temperature transmitted by the temperature sensor 6, thereby adjusting the flow rate of the gas sprayed by the nozzle 31.

[0048] In some embodiments, during submerged arc welding, when the interpass temperature detected by the temperature sensor 6 is 167°C to 172°C, the welding torch 2 is paused to prevent the interpass temperature from rising and exceeding 177°C. When the interpass temperature drops to 145°C to 155°C, the welding torch 2 resumes operation.

[0049] In some embodiments, the pipe welding method further includes: Preheating is performed on the portion of pipe 4 along the axial direction from 90mm to 110mm on one side of the annular joint 41 to 90mm to 110mm on the other side of the annular joint 41. In other words, preheating is performed on the portion of pipe 4 between the position 90mm to 110mm to the left of the annular joint 41 and the position 90mm to 110mm to the right of the annular joint 41. The preheating temperature is 10℃ to 20℃ to facilitate welding.

[0050] Next, perform argon arc welding on the circumferential joint 41 to apply two to three layers of root pass, with each layer consisting of no more than two passes. In other words, each layer consists of one or two passes. The heat input for the root pass should not exceed 20 KJ / cm. Argon arc welding can be performed automatically or manually, with manual argon arc welding being the preferred option. Performing argon arc welding facilitates subsequent submerged arc welding operations and improves welding quality and efficiency.

[0051] The air cooling device 3 is then inserted into the interior of the pipe 4, which has an annular joint 41. Optionally, after argon arc welding, the pipe 4 is placed on the rotating device 1, and the air cooling device 3 is inserted into the interior of the pipe 4 to facilitate subsequent submerged arc welding of the annular joint 41 by the welding torch 2.

[0052] Then, submerged arc welding is performed on the circumferential joint 41 using welding torch 2. Welding torch 2 can be handheld or mounted on a mounting frame; it can be mounted on a mounting frame for automatic submerged arc welding via the welding torch 2 and rotating device 1. The diameter of the welding wire used in submerged arc welding is 1.6mm to 3.2mm, and the welding speed is 20cm / min to 50cm / min to achieve good welding quality and efficiency.

[0053] Optionally, the current for submerged arc welding is 200A to 320A, and the voltage is 25V to 36.5V, in order to achieve better welding quality and welding efficiency.

[0054] In some embodiments, a bevel is provided on the annular joint 41 before the pipe 4 is preheated to facilitate subsequent welding; the bevel may be U-shaped.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, 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. Therefore, they should not be construed as limitations on this invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pipe welding device, characterized in that, The application relates to a welding device for welding a pipe (4) provided with an annular joint (41), which comprises a rotating device (1) for connecting and pivotally driving the pipe (4), a welding torch (2) for being arranged opposite the annular joint (41) and welding the annular joint (41), and a gas cooling device (3) for extending into the interior of the pipe (4) and spraying gas towards the annular joint (41) to reduce the temperature. The gas cooling device (3) comprises a nozzle (31) and a gas supply member connected with the nozzle (31) through a pipeline to supply gas to the nozzle (31), and the nozzle (31) is provided with a nozzle opening (311) and is arranged to extend into the interior of the pipe (4) and make the nozzle opening (311) face the annular joint (41) so that the gas sprayed from the nozzle opening (311) passes through the annular joint (41) to reduce the temperature.

2. The pipe welding apparatus of claim 1, wherein, One end of the nozzle (31) is provided with an interface (312) to connect the pipeline, the other end of the nozzle (31) is flared and is provided with a plurality of nozzle openings (311) on the end face, the nozzle (31) is arranged to extend into the interior of the pipe (4) and is arranged along the axial direction of the pipe (4) to be spaced apart from the annular joint (41), and the other end of the nozzle (31) faces the annular joint (41).

3. The pipe welding apparatus of claim 2, wherein, The application further comprises a sealing member (5) arranged to connect and close the pipe opening at one end of the pipe (4), the pipe opening at the other end of the pipe (4) is arranged to be open, and the gas cooling device (3) extends into the interior of the pipe (4) through the sealing member (5) and is arranged on the side of the annular joint (41) facing one end of the pipe (4), so that the gas sprayed by the gas cooling device (3) passes through the annular joint (41) to reduce the temperature.

4. The pipe welding apparatus of claim 1, wherein, The rotating device (1) comprises a chuck (11) and a jig (12) arranged to be spaced apart, the jig (12) is arranged to support one end of the pipe (4) so that the gas cooling device (3) extends into the pipe (4) from one end, and the chuck (11) is arranged to connect the other end of the pipe (4) and pivotally drive the pipe (4).

5. The pipe welding apparatus of claim 1, wherein, The application further comprises a temperature sensor (6) arranged to be spaced apart along the radial direction of the pipe (4) and arranged opposite the annular joint (41), and the temperature sensor (6) is arranged to contact the weld joint at the annular joint (41) to detect the interpass temperature.

6. The pipe welding apparatus according to any one of claims 1 to 5, characterized by, The application relates to a welding device for welding a pipe (4) provided with an annular joint (41), which comprises a rotating device (1) for connecting and pivotally driving the pipe (4), a welding torch (2) for being arranged opposite the annular joint (41) and welding the annular joint (41), and a gas cooling device (3) for extending into the interior of the pipe (4) and spraying gas towards the annular joint (41) to reduce the temperature.

7. A method of welding pipes, characterized in that The gas cooling device (3) is extended into the interior of the pipe (4) provided with the annular joint (41). Then the annular joint (41) is subjected to submerged arc welding through the welding torch (2), and the gas cooling device (3) sprays gas towards the annular joint (41) to reduce the temperature during the submerged arc welding. ​ 8. The pipe welding method according to claim 7, characterized by, A temperature sensor (6) is arranged opposite to the annular joint (41) before the annular joint (41) is subjected to submerged arc welding, and the temperature sensor (6) contacts a weld seam at the annular joint (41) and detects an interpass temperature during the submerged arc welding, the welding torch (2) is operated and paused according to the interpass temperature detected by the temperature sensor (6), and / or the gas cooling device (3) adjusts a flow rate of a blowing gas according to the interpass temperature detected by the temperature sensor (6) so that the interpass temperature is located at 10-177℃.

9. The pipe welding method according to claim 8, characterized by, During the submerged arc welding, the welding torch (2) is paused when the interpass temperature detected by the temperature sensor (6) is 167-172℃, and the welding torch (2) resumes operation when the interpass temperature is cooled to 145-155℃.

10. The pipe welding method according to any one of claims 7-9, characterized in that, Further comprising: The pipe (4) is preheated in a part of 90-110mm on one side of the annular joint (41) to 90-110mm on the other side of the annular joint (41) in an axial direction, and a preheating temperature is 10-20℃; The annular joint (41) is subjected to argon arc welding to lay a base of 2-3 layers, each layer is not more than 2 passes, and a heat input of a lay pass is not more than 20KJ / cm; Then the gas cooling device (3) is inserted into the inside of the pipe (4) provided with the annular joint (41); Then the annular joint (41) is subjected to submerged arc welding by the welding torch (2), a diameter of a welding wire for the submerged arc welding is 1.6-3.2mm, and a welding speed is 20-50cm / min.

Images