Submerged-arc welding flux backing forming process for jacket pipe manufacturing and using method of submerged-arc welding flux backing forming process

Abstract

The invention discloses a process for forming a submerged-arc welding flux liner for pipe making of a guide pipe frame and a using method thereof.The process for forming the submerged-arc welding flux liner for pipe making of the guide pipe frame comprises a supporting frame and a storage box, the storage box is arranged on the ground through the supporting frame, a rubber soft cushion is arranged on the storage box, and submerged-arc welding flux is laid in the rubber soft cushion; the submerged-arc welding flux abuts against the pipe outer groove of the jacket; a lifting support is arranged in the storage box, the lifting support jacks the rubber cushion so that the submerged-arc welding flux can be filled to the root of the pipe outer groove, the rubber cushion is connected with a low-frequency vibrator, and the low-frequency vibrator drives the submerged-arc welding flux to vibrate so that the pipe outer groove can be filled. According to the submerged-arc welding flux backing forming process for jacket pipe making, the submerged-arc welding flux is laid in the rubber soft cushion, the submerged-arc welding flux in the rubber soft cushion is filled into the outer groove of the pipe through the lifting support, the outer groove of the pipe is fully filled with the submerged-arc welding flux through the low-frequency vibrator, and the inner groove of the pipe is welded through the submerged-arc welding machine; the operation is simple.

Description

Technical Field

[0001] This invention belongs to the field of marine oil engineering construction technology, and in particular relates to a process for forming a flux pad for submerged arc welding of jacketed pipe and its application method. Background Technology

[0002] In marine engineering construction, jacket structures are enormous, typically exceeding 2 meters in diameter and 32 mm in wall thickness. Currently, in submerged arc welding for pipe fabrication, the weld seams of the jacket are welded using a root pass welding method.

[0003] The root pass welding process requires a large investment of manpower, resources, and equipment. At the same time, the root pass process also severely restricts welding efficiency and quality. Furthermore, due to the thick pipe wall, an X-shaped bevel is usually used to reduce the amount of welding work and weld constraint.

[0004] Therefore, it is urgent to design a process for submerged arc welding flux padding in the pipe laying of guide frame to solve the above-mentioned problems. Summary of the Invention

[0005] To address the technical issues mentioned in the background art, such as the need for significant investment of manpower, resources, and equipment in the initial welding process, which also severely restricts welding efficiency and quality, a flux padding process for submerged arc welding of jacketed pipes is provided to solve the problem of using flux padding for submerged arc welding of jacketed pipes.

[0006] To achieve the above objectives, the specific technical solution for the submerged arc welding flux pad formation process of the present invention for the jacket structure is as follows: A process for forming a pad for submerged arc welding flux in the fabrication of a conduit frame includes a support frame and a storage box. The storage box is set on the ground by the support frame and has a rubber pad on it. Submerged arc welding flux is laid inside the rubber pad and comes into contact with the outer bevel of the conduit frame. A lifting bracket is provided inside the storage box to lift the rubber pad so that the submerged arc welding flux fills to the root of the outer bevel. The rubber pad is connected to a low-frequency vibrator, which drives the submerged arc welding flux to vibrate and compact the outer bevel.

[0007] Furthermore, the inner bevel of the jacket structure on the side away from the outer bevel is welded using a submerged arc welding machine to weld the jacket structure ports together.

[0008] Furthermore, multiple lifting brackets are spaced apart along the length of the storage box, and each lifting bracket is connected to a rotating screw. The lifting brackets are adjusted by rotating the screws to lift the rubber pads.

[0009] Furthermore, the low-frequency vibrator is connected to a motor, which drives the low-frequency vibrator to vibrate so that the submerged arc welding flux fills the outer bevel of the pipe.

[0010] Furthermore, the storage box is equipped with multiple low-frequency vibrators so that low-frequency vibrators are installed between adjacent lifting supports.

[0011] Furthermore, the storage box is provided with a limiting groove so that the rubber pad can be placed in the limiting groove.

[0012] Furthermore, multiple lifting brackets are arranged into two groups along the width of the storage box.

[0013] Furthermore, support frames are spaced apart on the ground, and storage boxes are located between the support frames so that the support frames can support the guide frame.

[0014] A method for using a flux pad forming process in submerged arc welding of guide frame pipes mainly includes the following steps: S1. Place the guide frame on the spaced-out support frame, with the welding position of the guide frame located above the storage box; S2. Rotate the rotating screw to drive the lifting bracket to lift the rubber pad, and initially fill the submerged arc welding flux in the rubber pad to the outer bevel of the pipe. S3. Start the motor. The motor drives the rubber pad to vibrate, so that the submerged arc welding flux fills the outer bevel of the pipe. S4. Extend the submerged arc welding machine into the guide frame and weld the inner bevel of the pipe.

[0015] Furthermore, the electric motor drives the submerged arc welding flux to be evenly filled to the root of the outer bevel of the pipe.

[0016] The submerged arc welding flux pad forming process for the guide frame manufacturing of the present invention has the following advantages: This method involves laying submerged arc welding flux inside a rubber pad, and then using a lifting support to fill the flux into the outer bevel of the pipe. A low-frequency vibrator then fully fills the outer bevel with flux, and finally, a submerged arc welding machine welds the inner bevel. This method offers advantages such as simple operation and high weld quality, meeting practical needs and suitable for large-scale application. It possesses significant substantive features and substantial progress, and is applicable to the welding construction of jacket structures in marine engineering. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of the process for forming the flux pad for the submerged arc welding of the guide frame in this invention. Figure 2 This is a cross-sectional schematic diagram of the process for forming the flux pad for the submerged arc welding of the guide frame in this invention. Figure 3 This is a side view schematic diagram of the process for forming a flux pad for submerged arc welding in the fabrication of the guide frame according to the present invention. Figure 4 This is a schematic diagram of the weld bevel assembly process in the submerged arc welding flux pad formation process of the guide frame manufacturing of the present invention.

[0018] Explanation of markings in the diagram: 1. Support frame; 2. Storage box; 3. Rubber pad; 4. Submerged arc welding flux; 5. Conduit frame; 6. External pipe bevel; 7. Internal pipe bevel; 8. Lifting bracket; 9. Low frequency vibrator; 10. Submerged arc welding machine; 11. Rotating screw; 12. Motor; 13. Support frame; 14. Root gap. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0021] The following is a reference to the appendix. Figure 1 To be continued Figure 4 This invention describes the process for forming a pad for the flux lining in the submerged arc welding of the guide frame.

[0022] like Figure 1 and Figure 3 As shown, the submerged arc welding flux padding process for the conduit frame manufacturing of this invention includes a support frame 1 and a storage box 2. The storage box 2 is set on the ground via the support frame 1. A rubber pad 3 is provided on the storage box 2, and submerged arc welding flux 4 is laid inside the rubber pad 3. The submerged arc welding flux 4 abuts against the outer bevel 6 of the conduit frame 5. A lifting bracket 8 is provided inside the storage box 2. The lifting bracket 8 lifts the rubber pad 3 so that the submerged arc welding flux 4 fills to the root of the outer bevel 6. The rubber pad 3 is connected to a low-frequency vibrator 9, which drives the submerged arc welding flux 4 to vibrate, thereby filling the outer bevel 6.

[0023] By laying submerged arc welding flux 4 inside the rubber pad 3, and filling the outer bevel 6 of the pipe with the flux 4 from the rubber pad 3 through the lifting bracket 8, and then using a low-frequency vibrator 9 to fully fill the outer bevel 6 with the flux 4, the inner bevel 7 is welded by the submerged arc welding machine 10. This application has the advantages of simple operation and high weld quality, meets practical needs, is suitable for large-scale promotion and application, has outstanding substantive features and significant progress, and is applicable to the welding construction of marine engineering jackets.

[0024] Furthermore, such as Figure 3 and Figure 4 As shown, the inner bevel 7 of the guide frame 5 on the side away from the outer bevel 6 is welded by the submerged arc welding machine 10 so that the ports of the guide frame are welded together; multiple lifting brackets 8 are arranged at intervals along the length of the storage box 2, and multiple lifting brackets 8 are all connected to rotating screws 11. The lifting brackets 8 are adjusted by rotating screws 11 to lift the rubber pads 3; the low frequency vibrator 9 is connected to a motor 12, and the motor 12 drives the low frequency vibrator 9 to vibrate so that the submerged arc welding flux 4 fills the outer bevel 6 of the pipe.

[0025] In this embodiment, the guide frame 5 is made of rolled steel plate. The guide frame 5 is cylindrical in shape, and a root gap 14 is formed at the welding port of the guide frame 5, as well as an outer bevel 6 facing outward and an inner bevel 7 facing inward.

[0026] The steel plates are rolled and assembled, with a root gap of 2mm-4mm. TIG welding is used for tack welding at the root, with smooth transitions on both sides to ensure that the submerged arc welding can directly melt the root pass into the weld. Preferably, the TIG welding wire is ER80S-Ni1 with a diameter of 2.4mm, the shielding gas is 99.95% argon, the tack welding current is 90-130A, the voltage is 9-11V, the welding speed is 50-80mm / min, and the heat input is 0.7-1.7KJ / mm.

[0027] Preferably, a storage box 2 is provided below the outer bevel 6 of the guide tube frame 5, and a rubber pad 3 is connected to the storage box 2. Sufficient submerged arc welding flux 4 is laid inside the rubber pad 3. Multiple lifting brackets 8 are provided inside the storage box 2 for lifting the rubber pad 3.

[0028] Multiple lifting brackets 8 are connected to rotating screws 11 set on storage box 2. By rotating rotating screws 11, the lifting brackets 8 are driven to lift the rubber pad 3, so that the submerged arc welding flux 4 in the rubber pad 3 enters the outer bevel 6 of the pipe.

[0029] The low-frequency vibrator 9 vibrates the rubber pad 3. Preferably, the low-frequency vibrator 9 is connected to the motor 12, and the motor 12 drives the low-frequency vibrator 9 to vibrate, so that the submerged arc welding flux 4 in the rubber pad 3 is fully filled into the outer bevel 6 of the pipe. At this time, the submerged arc welding machine 10 is inserted into the guide frame 5, and the submerged arc welding machine 10 welds the inner bevel 7 of the pipe. When welding the inner bevel 7 of the pipe, the submerged arc welding flux 4 acts as a pad to protect the welding.

[0030] Furthermore, such as Figures 1 to 3As shown, the storage box 2 is equipped with multiple low-frequency vibrators 9 so that low-frequency vibrators 9 are installed between adjacent lifting supports 8; the storage box 2 is provided with a limiting groove so that the rubber pad 3 is placed in the limiting groove; the multiple lifting supports 8 are arranged in two groups along the width direction of the storage box 2; support frames 13 are arranged at intervals on the ground, and the storage box 2 is located between the support frames 13 so that the support frames 13 support the guide tube frame 5.

[0031] In this embodiment, preferably, multiple low-frequency vibrators 9 are provided in the storage box 2, and the low-frequency vibrators 9 are arranged between adjacent lifting supports 8 so that the entire outer bevel 6 of the pipe is filled with submerged arc welding flux 4.

[0032] Preferably, the submerged arc welding wire is F8A8-ENi1-Ni1 with a diameter of 4.0mm, the flux is F8A8-ENi1-Ni1-H5, the first pass welding uses a current of 350-460A, a voltage of 25-29V, a welding speed of 350-450mm / min, and a heat input of 1.2-2.0KJ / mm, and the filler and cover pass welding uses a current of 450-650A, a voltage of 28-34V, a welding speed of 360-450mm / min, and a heat input of 1.8-3.5KJ / mm.

[0033] A limiting groove matching the shape of the rubber pad 3 is provided above the storage box 2. The rubber pad 3 is connected to the limiting groove on all four sides so that the lifting bracket 8 and the low frequency vibrator 9 can contact the bottom of the rubber pad 3, thereby filling the submerged arc welding flux 4 in the outer bevel 6 of the pipe.

[0034] In order to align the outer bevel 6 of the pipe to be welded part of the guide frame 5 with the storage box 2, the guide frame 5 is abutted against the support frame 13 by setting support frames 13 at intervals on the ground, which facilitates the adjustment of the position of the outer bevel 6 and achieves the fixation of the guide frame 5.

[0035] This application also provides a method for using a flux pad forming process in submerged arc welding of guide frame pipe manufacturing, which mainly includes the following steps: S1. Place the guide frame 5 on the spaced support frame 13, with the inner bevel 7 of the guide frame 5 to be welded located above the storage box 2. S2. Rotate the rotating screw 11 to drive the lifting bracket 8 to lift the rubber pad 3, and initially fill the submerged arc welding flux 4 in the rubber pad 3 to the outer bevel 6 of the pipe. S3. Start motor 12. Motor 12 drives rubber pad 3 to vibrate, so that the submerged arc welding flux 4 fills the root of the pipe bevel 7. S4. Observe whether the submerged arc welding flux 4 enters the inner bevel 6 through the root gap 14 after filling the outer bevel 6 of the pipe. If it enters the inner bevel 6, clean the submerged arc welding flux 4 at the inner bevel 6. S5. Extend the submerged arc welding machine 10 into the guide frame 2 and weld the inner bevel 7 of the pipe. After the welding of the inner bevel 7 of pipe S6 is completed, the storage box 2 is removed by the support frame 1, and then the outer bevel 6 of pipe is submerged arc welded, and the pipe frame 5 is completed.

[0036] The submerged arc welding flux padding process for jacket foundation construction involves laying submerged arc welding flux 4 inside a rubber pad 3, and then using a lifting support 8 to fill the outer bevel 6 of the pipe with the flux 4 from the rubber pad 3. A low-frequency vibrator 9 then fully fills the outer bevel 6 with the flux 4, and finally, a submerged arc welding machine 10 welds the inner bevel 7. This application offers advantages such as simple operation and high weld quality, meeting practical needs and suitable for large-scale application. It possesses outstanding substantive features and significant progress, and is applicable to the welding construction of jacket foundations in marine engineering.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A process for forming a flux pad for submerged arc welding in the fabrication of a guide frame, characterized in that, It includes a support frame and a storage box. The storage box is set on the ground by the support frame. The storage box is equipped with a rubber pad and a submerged arc welding flux is laid inside the rubber pad. The submerged arc welding flux abuts against the outer bevel of the pipe of the conduit frame. The storage box is equipped with a lifting bracket, which lifts the rubber pad so that the submerged arc welding flux fills to the root of the pipe bevel. The rubber pad is connected to a low-frequency vibrator, which drives the submerged arc welding flux to vibrate and fill the pipe bevel.

2. The process for forming a gasket using submerged arc welding flux in the fabrication of a guide frame according to claim 1, characterized in that, The inner bevel of the jacket structure on the side away from the outer bevel is welded using a submerged arc welding machine to weld the jacket structure ports together.

3. The process for forming a gasket using submerged arc welding flux in the fabrication of a guide frame according to claim 1, characterized in that, Multiple lifting brackets are spaced apart along the length of the storage box. Each lifting bracket is connected to a rotating screw, and the lifting bracket is adjusted by rotating the screw to lift the rubber pad.

4. The process for forming a gasket using submerged arc welding flux in the fabrication of a guide frame according to claim 1, characterized in that, The low-frequency vibrator is connected to a motor, which drives the low-frequency vibrator to vibrate so that the submerged arc welding flux fills the outer bevel of the pipe.

5. The process for forming a gasket using submerged arc welding flux in the fabrication of a guide frame according to claim 4, characterized in that, The storage box is equipped with multiple low-frequency vibrators so that low-frequency vibrators are installed between adjacent lifting supports.

6. The process for forming a gasket using submerged arc welding flux in the fabrication of a guide frame according to claim 1, characterized in that, The storage box is equipped with a limiting groove so that the rubber pad can be placed in the limiting groove.

7. The process for forming a gasket for submerged arc welding of guide tubes according to claim 3, characterized in that, Multiple lifting brackets are arranged in two groups along the width of the storage box.

8. The process for forming a gasket for submerged arc welding of guide tubes according to claim 1, characterized in that, Support frames are spaced apart on the ground, and storage boxes are located between the support frames so that the support frames can support the guide frame.

9. A method for using a flux pad forming process in submerged arc welding of guide frame pipes, characterized in that, The process for forming the flux pad for submerged arc welding of the guide frame as described in any one of claims 1-8 mainly includes the following steps: S1. Place the guide frame on the spaced-out support frame, with the welding position of the guide frame located above the storage box; S2. Rotate the rotating screw to drive the lifting bracket to lift the rubber pad, and initially fill the submerged arc welding flux in the rubber pad to the outer bevel of the pipe. S3. Start the motor. The motor drives the rubber pad to vibrate, so that the submerged arc welding flux fills the outer bevel of the pipe. S4. Extend the submerged arc welding machine into the guide frame and weld the inner bevel of the pipe.

10. The method of using the submerged arc welding flux pad forming process for guide frame pipe fabrication according to claim 9, characterized in that, The electric motor drives the submerged arc welding flux to be evenly filled to the root of the outer bevel of the pipe.

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