Corrugated pipe joint manufacturing method, welding tool and fixing tool

Abstract

The invention relates to the technical field of stainless steel corrugated pipe manufacturing, and discloses a corrugated pipe joint manufacturing method, an assembling and welding tool and a fixing tool. The method comprises the steps that straight edge sections are taken at the two ends of a corrugated pipe, and corrugated pipe joints are welded to the two ends of the corrugated pipe in a laser welding mode; the corrugated pipe joint at one end of the corrugated pipe is assembled and fixed through a welding tool and a three-dimensional platform, so that the corrugated pipe joint at the other end of the corrugated pipe is aligned with the part, used for installing the corrugated pipe, of the main product, and then the main product and the corrugated pipe joint on one side of the main product are welded through argon arc welding; after the welding seam is cooled, the welding tool is dismantled; the fixing tool is installed on the corrugated pipe, and the axial direction and the radial direction of the corrugated pipe are limited; the airtightness testing tool is installed at an outlet of a corrugated pipe joint through a hoop, a main product is placed in a water tank, compressed air of 2 Mpa is introduced, pressure maintaining is conducted for 15 min, and if it is observed that no leakage exists on the surface of the corrugated pipe, the corrugated pipe is qualified, and the airtightness testing tool can adapt to high-temperature, high-pressure and high-precision working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel bellows manufacturing, and in particular to a bellows joint manufacturing method, an assembly welding tool and a fixing tool. Background Art

[0002] Stainless steel corrugated pipe is installed in liquid transportation system as a flexible pressure-resistant pipe to compensate the mutual displacement of the connection ends of pipelines, machines and equipment, and can play the role of shock absorption and noise reduction. It has the characteristics of good flexibility, corrosion resistance, fatigue resistance, high and low temperature resistance, etc. Conventional stainless steel pipes have been widely used in water supply and drainage, chemical industry, petroleum, machinery manufacturing, automobiles, ships and other fields due to their excellent performance and unique structure.

[0003] At present, traditional stainless steel thin-wall bellows joints are mostly welded by plug-in argon arc welding, and then assembled and welded with other parts for airtight testing. This manufacturing method causes leakage when the bellows and joints are welded together because the high temperature of argon arc welding easily melts through the thin-walled material. At the same time, the high temperature and high pressure during argon arc welding and airtight testing cause the bellows to be severely deformed, and the joints and connected products are difficult to assemble.

[0004] With the widespread application of stainless steel bellows joints under high temperature, high pressure and high precision working conditions, the above welding and airtightness testing problems need to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a bellows joint manufacturing method, an assembly welding tool and a fixing tool to solve the problem that traditional stainless steel thin-walled bellows cannot be used under high temperature, high pressure and high precision working conditions.

[0006] In a first aspect, the present invention provides a method for manufacturing a corrugated pipe joint, comprising the following steps:

[0007] Take straight edge sections at both ends of the bellows, and weld bellows joints at both ends of the bellows by laser welding;

[0008] Assemble and fix the bellows joint at one end of the bellows using welding fixtures and a three-dimensional platform, so that the bellows joint at the other end of the bellows is aligned with the portion of the main product used to install the bellows, and then weld the main product to the bellows joint on one side of the main product using argon arc welding;

[0009] After the weld is cooled, the welding tool is removed;

[0010] Installing a fixing device on the bellows to limit the axial and radial directions of the bellows;

[0011] Use a clamp to install the airtight test fixture at the outlet of the bellows joint, place the main product in a water tank, and pass 2Mpa compressed air. Maintain the pressure for 15 minutes. If there is no leakage on the surface of the bellows, it is qualified.

[0012] Beneficial effect: Traditional welding structures are mostly joints and bellows that are inserted into each other, and argon arc welding with filler wire is used for welding, which is easy to melt through thin-walled bellows and cause leakage. To avoid this problem, the present invention takes straight edge sections at both ends of the bellows, and bellows joints need to be welded at both ends of the bellows. The side of the bellows joint used for welding with the bellows is also a plane. When welding, the straight edge section at the end of the bellows is directly welded to the end plane of the bellows joint, which can avoid melting through the thin-walled bellows caused by plug-in welding and causing leakage. In this embodiment, laser welding is used for welding the bellows and the bellows joint. The low heat characteristics of laser welding ensure that the thin-walled structure of the bellows is not easy to melt through and cause leakage. After both ends of the bellows are welded to the bellows joint, the bellows joint at one end of the bellows is assembled and fixed using a welding tool and a three-dimensional platform to ensure that the position of the bellows and the bellows joint remains fixed, and to prevent the bellows from deforming axially and radially due to the high temperature at the weld during argon arc welding, and irregular deformation, resulting in large dimensional deviations, and the interface with other products cannot be installed. In the present invention, the bellows joint and the bellows are fixed by welding tools and a three-dimensional platform, so that the bellows joint at the other end of the bellows is aligned with the part of the main product used to install the bellows, and then the main product is welded to the bellows joint on one side of the main product using argon arc welding, so that it has a high-strength limit during argon arc welding, and can control the axial deformation of the bellows by ±0.3mm and the radial deformation by ±0.1mm, ensuring the high-precision requirements of the product size. After the weld between the main product and the bellows joint is cooled, the welding tool is removed. Then, the air tightness of the welded bellows needs to be tested. In the present invention, in order to avoid the axial and radial deformation of the bellows due to the internal high pressure during the air tightness test, a fixed tool is installed on the bellows before the air tightness test, and the axial and radial positions of the bellows are limited by the fixed tool. Then, the air tightness test tool is installed at the outlet of the bellows joint using a clamp, the main product is placed in a water tank, and 2Mpa compressed air is introduced, the pressure is maintained for 15 minutes, and the bellows surface is observed to be qualified if there is no leakage. Among them, the air tightness test tool adopts the existing air tightness test tool, which is directly used in the present invention.

[0013] In an optional embodiment, after the weld is cooled, in the step of removing the welding tooling, the weld needs to be cooled to a temperature less than 80° C. before the welding tooling can be removed.

[0014] In an optional embodiment, before using argon arc welding to weld the main product to the bellows joint, the welding point between the main product and the bellows joint is wiped clean with alcohol to ensure that there is no oil stain.

[0015] Beneficial effects: Before officially carrying out TIG welding operations and welding the main product to the bellows joint, it is necessary to comprehensively and meticulously clean the welding parts of both. Specifically, alcohol is selected as the cleaning medium. With the help of a clean wiping tool, such as a clean gauze or degreased cotton ball, after dipping an appropriate amount of alcohol, repeatedly wipe the welding parts of the main product and the bellows joint with uniform and appropriate force. The presence of oil stains will seriously interfere with the quality and effect of welding. It may not only cause defects such as pores and inclusions during welding but also reduce the strength and sealing performance of the weld. Only by thoroughly removing the oil stains at the welding parts through alcohol wiping can a solid foundation be laid for the subsequent TIG welding operations, effectively ensuring that the welding joint has excellent quality and reliable performance, enabling the main product and the bellows joint to be firmly and accurately connected as a whole, meeting the corresponding process standards and actual application requirements.

[0016] In an alternative embodiment, welding the bellows joint to both ends of the bellows using laser welding includes:

[0017] Spot-weld the bellows joint to the bellows for fixation, and then use laser welding with filler wire to weld the joint surface.

[0018] In an alternative embodiment, the welding parameters are as follows:

[0019] Power: 600W - 800W;

[0020] Wire feeding speed: 220mm / min - 300mm / min;

[0021] Wire feeding delay: 3s - 5s;

[0022] Wire diameter: φ1.6mm - φ2.0mm;

[0023] Welding speed: 6mm / s - 10mm / s;

[0024] Argon gas flow rate: 12L / min - 15L / min.

[0025] In a second aspect, the present invention also provides a welding tooling, including:

[0026] A bottom plate, adapted to be fixed on a three-dimensional platform;

[0027] A vertical plate, the bottom end of which is fixed on the bottom plate, and a fixing part is provided at the upper end of the vertical plate, and the fixing part is adapted to be fixed to the bellows joint.

[0028] Beneficial effect: By providing a welding tool, after both ends of the bellows are welded to the bellows joints, the bellows joint at one end of the bellows is assembled and fixed using the welding tool and the three-dimensional platform to ensure that the position of the bellows and the bellows joint remains fixed, avoiding axial and radial deformation of the bellows due to high temperature at the weld during argon arc welding, and avoiding irregular dimensional deviations, making it impossible to install the interface with other products.

[0029] In an optional embodiment, it further includes reinforcing ribs connected between the bottom plate and the vertical plate.

[0030] In a third aspect, the present invention further provides a fixing tool, comprising:

[0031] A first limiting ring is suitable for being sleeved on one end of the bellows, and the first limiting ring abuts against the upper step surface of the bellows joint at the end of the bellows;

[0032] A second limiting ring is adapted to be sleeved on the other end of the bellows, and the second limiting ring abuts against the upper step surface of the bellows joint at the end of the bellows;

[0033] A connecting member connects the first limiting ring and the second limiting ring, and the connecting member fixes the first limiting ring and the second limiting ring to limit the axial and radial displacements of the bellows.

[0034] Beneficial effect: After the weld between the main product and the bellows joint is cooled, the welding tooling is removed. Then the air tightness of the welded bellows needs to be tested. First, the first limit ring is put on the circumference of one end of the bellows close to the main product, and after the sleeve connection is completed, the first limit ring abuts against the step surface of the bellows joint at this end of the bellows, thereby preventing the first limit ring from moving toward the direction of the bellows close to the welding tooling. Similarly, after the first limit ring is sleeved, the second limit ring is put on the end of the bellows close to the welding tooling by the same operation, and the second limit ring abuts against the step surface of the bellows joint at this end of the bellows, thereby preventing the second limit ring from moving in the direction of the first limit ring. Then the connecting piece is connected to the first limit ring and the second limit ring, and the first limit ring and the second limit ring are tightened by the connecting piece. Since the first limit ring and the second limit ring are both abutted against the step surface on the bellows joint, they will not move. By adding fixed tooling to the periphery of the bellows and performing high-strength position limiting on the bellows during the airtight test, the axial deformation of the bellows can be controlled to ±0.2mm, and the radial deformation to ±0.2mm, ensuring that the bellows still has high precision after the airtight test is completed.

[0035] In an alternative embodiment, the first limiting ring and the second limiting ring are both provided with stepped abutting surfaces inwardly on the side close to the bellows joint, and the limiting rings abut against the stepped surfaces on the bellows joint through the stepped abutting surfaces.

[0036] Beneficial effects: One end of the bellows fixed by the bellows joint bulges outward to form an annular protrusion, and thus a stepped surface is formed on the bellows joint. The first limiting ring and the second limiting ring are both provided with stepped abutting surfaces inwardly on the side close to the bellows joint. After the installation of the first limiting ring and the second limiting ring on the bellows is completed, the stepped abutting surfaces of the first limiting ring and the second limiting ring abut against the stepped surfaces on the bellows joint, so as to ensure that the first limiting ring and the second limiting ring will not approach each other due to the pulling of the connecting piece, resulting in the deformation of the bellows.

[0037] In an alternative embodiment, the limiting ring is composed of two semi-circular half rings, and the ends of the two semi-circular half rings are connected.

[0038] Beneficial effects: The second limiting ring is divided into two parts, namely two semi-circular half rings. When the two semi-circular half rings are spliced, they can form a complete second limiting ring. Further, protruding clamping blocks are provided at both ends of one of the two semi-circular half rings. Correspondingly, clamping grooves adapted to insert the clamping blocks are provided at both ends of the other of the two semi-circular half rings. During use, the clamping blocks at both ends of one half ring can be inserted into the clamping grooves at both ends of the other half ring. Further, threaded holes are provided on the clamping blocks and the groove walls of the clamping grooves. By screwing bolts into the threaded holes on the clamping blocks and the groove walls of the clamping grooves, the two semi-circular half rings can be fixed on the periphery of the threaded pipe. Description of the Drawings

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 The front view of a welding tooling and a fixing tooling according to an embodiment of the present invention;

[0041] Figure 2 The structural schematic diagram of a fixing tooling and a bellows according to an embodiment of the present invention;

[0042] Figure 3 The structural schematic diagram of a fixing tooling according to an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the structure of a corrugated pipe and a corrugated pipe joint according to an embodiment of the present invention.

[0044] Explanation of reference numerals:

[0045] 1. Corrugated pipe; 2. Corrugated pipe joint; 3. Welding tooling; 31. Bottom plate; 32. Vertical plate; 33. Reinforcing rib; 4. Three-dimensional platform; 5. Main product; 6. Clamp; 7. Fixing tooling; 71. First limiting ring; 72. Second limiting ring; 73. Connecting piece. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] As a flexible pressure-resistant pipe fitting, the stainless steel pipe corrugated pipe is installed in a liquid conveying system to compensate for the relative displacement of the connection ends of pipes or machines and equipment, and can play roles such as shock absorption and noise elimination. It has characteristics such as good flexibility, corrosion resistance, fatigue resistance, and resistance to high and low temperatures. Due to its excellent performance and unique structure, the conventional stainless steel pipe has been widely used in the fields of water supply and drainage, chemical engineering, petroleum, machinery manufacturing, automobiles, ships, etc.

[0048] Currently, most traditional stainless steel thin-wall corrugated pipe joints are welded by plug-in argon arc welding, and then assembled and welded with other components for airtight testing. In this manufacturing method, when the corrugated pipe and the joint are butt-welded, the high temperature of the argon arc welding is likely to penetrate the thin-wall material and cause leakage. At the same time, during argon arc welding and airtight testing, the corrugated pipe is severely deformed due to high temperature and high pressure, and it is difficult to assemble the joint with the connected product.

[0049] With the wide application of stainless steel corrugated pipe joints under high temperature, high pressure, and high-precision working conditions, the above-mentioned welding and airtight testing problems need to be solved urgently.

[0050] The following combines Figures 1 to 4 , to describe the embodiments of the present invention.

[0051] According to an embodiment of the present invention, on the one hand, a manufacturing method of a corrugated pipe joint is provided, including the following steps:

[0052] Take straight-edge segments at both ends of the corrugated pipe 1, and weld the corrugated pipe joint 2 at both ends of the corrugated pipe 1 by laser welding;

[0053] Assemble and fix the bellows joint 2 at one end of the bellows 1 using the welding tooling 3 and the three-dimensional platform 4, align the bellows joint 2 at the other end of the bellows 1 with the part of the main product 5 for installing the bellows 1, and then weld the main product 5 and the bellows joint 2 on one side of the main product 5 using argon arc welding;

[0054] After the weld cools down, remove the welding tooling 3;

[0055] Install the fixing tooling 7 on the bellows 1 to limit the axial and radial directions of the bellows 1;

[0056] Install the airtight test tooling at the outlet of the bellows joint 2 using the clamp 6, place the main product 5 in the water tank, and introduce 2 Mpa of compressed air. Keep the pressure for 15 minutes. If there is no leakage on the surface of the bellows 1, it is qualified.

[0057] The traditional welding structure form is mostly butt welding of the joint and the bellows, using argon arc welding with filler wire. It is easy to melt through the thin-walled bellows and cause leakage. To avoid this problem, as Figure 4 shown, in this embodiment, straight-edge sections are taken at both ends of the bellows 1. The bellows joint 2 needs to be welded to both ends of the bellows 1, and the surface of the bellows joint 2 for welding with the bellows 1 is also a plane. During welding, by directly abutting and welding the straight-edge section at the end of the bellows 1 with the end plane of the bellows joint 2, it can avoid the leakage caused by melting through the thin-walled bellows 1 during butt welding. In this embodiment, the welding method for the bellows 1 and the bellows joint 2 is laser welding. The low heat characteristic of laser welding ensures that the thin-walled structure of the bellows 1 is not easily melted through and cause leakage. As Figure 1As shown, after both ends of the bellows 1 are welded to the bellows connector 2, the bellows connector 2 at one end of the bellows 1 is assembled and fixed using the welding tool 3 and the three-dimensional platform 4 to ensure that the position of the bellows 1 and the bellows connector 2 remains fixed, and to prevent the bellows 1 from deforming axially and radially with the high temperature at the weld during argon arc welding, and irregular, resulting in large dimensional deviations, and the interface with other products cannot be installed. In this embodiment, the bellows connector 2 and the bellows 1 are fixed by the welding tool 3 and the three-dimensional platform 4, so that the bellows connector 2 at the other end of the bellows 1 is aligned with the part of the main product 5 for installing the bellows 1, and then the main product 5 is welded to the bellows connector 2 on one side of the main product 5 using argon arc welding, so that it has a high-strength limit during argon arc welding, and can control the axial deformation of the bellows 1 by ±0.3mm, and the radial deformation by ±0.1mm, to ensure the high-precision requirements of the product size. After the weld between the main product 5 and the bellows connector 2 is cooled, the welding tool 3 is removed. Then, the air tightness of the welded bellows 1 needs to be tested. In this embodiment, in order to prevent the bellows 1 from deforming in the axial and radial directions due to the internal high pressure during the air tightness test, the fixing fixture 7 is installed on the bellows 1 before the air tightness test, and the bellows 1 is limited in the axial and radial directions by the fixing fixture 7. Then, the air tightness test fixture is installed at the outlet of the bellows joint 2 using the clamp 6, the main product 5 is placed in the water tank, and 2Mpa compressed air is introduced, the pressure is maintained for 15 minutes, and the bellows 1 is observed to be qualified if there is no leakage on the surface. Among them, the air tightness test fixture adopts existing air tightness test components.

[0058] In one embodiment, after the weld is cooled, in the step of removing the welding tool 3, the weld needs to be cooled to a temperature less than 80°C before the welding tool 3 can be removed.

[0059] In one embodiment, before using argon arc welding to weld the main product 5 and the bellows joint 2, the welding point between the main product 5 and the bellows joint 2 is cleaned with alcohol to ensure that there is no oil stain.

[0060] Before officially starting the argon arc welding operation and welding the main product 5 and the bellows joint 2, be sure to perform a comprehensive and detailed cleaning operation on the welding parts of the two. Specifically, use alcohol as the cleaning medium, with the help of a clean wiping tool, such as a clean gauze or a cotton ball, dip an appropriate amount of alcohol, and repeatedly wipe the welding parts of the main product 5 and the bellows joint 2 with a uniform and moderate force. The presence of oil stains will seriously interfere with the quality and effect of welding. It may not only cause defects such as pores and inclusions during welding, but also reduce the strength and sealing of the weld. Only by thoroughly removing the oil stains at the welding point through alcohol wiping can a solid foundation be laid for subsequent argon arc welding operations, effectively ensuring the high quality and reliable performance of the welding joint, so that the main product 5 and the bellows joint 2 can be firmly and accurately connected as a whole, meeting the corresponding process standards and actual application requirements.

[0061] In one embodiment, laser welding is used to weld the bellows joints 2 at both ends of the bellows 1, which includes spot welding and fixing the bellows joint 2 to the bellows 1, and then using laser welding with filler wire to weld the joint surface.

[0062] When using the laser welding process to weld the bellows 1 and the joint, two key steps should be done in sequence. First, accurately align the suitable bellows joint 2 with the bellows 1 and preliminarily fix it by spot welding. During spot welding, according to parameters such as material and thickness, accurately control the current intensity and duration, and evenly distribute the spot welding positions to ensure stable connection and accurate position.

[0063] After completing the spot welding, enter the laser welding with filler wire process. Select a matching filler wire material and feed it into the laser focused joint surface area at a precise angle and speed. During welding, monitor in real time and dynamically adjust the laser power, welding speed, and filler wire feeding speed. Ensure that the laser power can fully melt the material, the welding speed matches the filler wire feeding speed, making the weld seam full, beautiful, and meeting the internal quality standards.

[0064] Specifically, the welding parameters are as follows:

[0065] Power: 600W - 800W; wire feeding speed: 220mm / min - 300mm / min; wire feeding delay: 3s - 5s; wire diameter: φ1.6mm - φ2.0mm;

[0066] Welding speed: 6mm / s - 10mm / s; argon gas flow rate: 12L / min - 15L / min.

[0067] The method for manufacturing the bellows joint provided in this embodiment, by fixing the bellows 1, the bellows joint 2, the three-dimensional platform 4, and the welding tooling 3, has high-strength limiting during argon arc welding, can control the axial deformation of the bellows 1 within ±0.3mm and the radial deformation within ±0.1mm, ensuring high-precision requirements for product dimensions. By adding a fixing tooling 7 around the bellows 1, high-strength limiting is applied to the bellows 1 during the airtightness test, and the axial deformation of the bellows 1 can be controlled within ±0.2mm and the radial deformation within ±0.2mm, ensuring that the bellows 1 still has high precision after the airtightness test is completed.

[0068] According to an embodiment of the present invention, on the other hand, a welding tooling 3 is also provided, as Figure 1As shown, it includes a bottom plate 31, a vertical plate 32 and a reinforcing rib 33. The bottom plate 31 is fixed on the three-dimensional platform 4, the bottom end of the vertical plate 32 is fixed on the bottom plate 31, and a fixing part is provided at the upper end of the vertical plate 32, and the fixing part is adapted to be fixed to the bellows joint 2. By providing the welding tooling 3, after both ends of the bellows 1 are welded to the bellows joint 2, the bellows joint 2 at one end of the bellows 1 is assembled and fixed using the welding tooling 3 and the three-dimensional platform 4 to ensure that the positions of the bellows 1 and the bellows joint 2 are fixed, and to prevent the bellows 1 from deforming axially and radially due to the high temperature at the weld during argon arc welding in an irregular manner, resulting in large dimensional deviations and inability to install at the butting interface with other products.

[0069] In one embodiment, the welding tooling 3 further includes a reinforcing rib 33, and the reinforcing rib 33 is connected between the bottom plate 31 and the vertical plate 32. Among them, the number of the reinforcing ribs 33 is set to two, and both of the two reinforcing ribs 33 are inclined. The upper end of the reinforcing rib 33 is fixed to the side wall of the vertical plate 32, and the lower end of the reinforcing rib 33 is fixed to the upper side of the bottom plate 31.

[0070] In one embodiment, the fixing part at the upper end of the vertical plate 32 is a columnar member fixed to the side wall of the vertical plate 32. The columnar member is provided with an annular protrusion extending outward at one end for fixing the bellows joint 2. When fixing the bellows joint 2, the bellows joint 2 is abutted against the end of the columnar member, and then the circumferential edge part of the bellows joint 2 is fixed to the annular protrusion at the end of the columnar member through a clamp 6 to achieve the fixation of the bellows joint 2.

[0071] According to an embodiment of the present invention, on the other hand, a fixing tooling 7 is further provided, as Figure 2 and Figure 3 shown, it includes a first limiting ring 71, a second limiting ring 72 and a connecting member 73. The first limiting ring 71 is adapted to be sleeved on one end of the bellows 1, and the first limiting ring 71 abuts against the upper step surface of the bellows joint 2 at this end of the bellows 1; the second limiting ring 72 is adapted to be sleeved on the other end of the bellows 1, and the second limiting ring 72 abuts against the upper step surface of the bellows joint 2 at this end of the bellows 1; the connecting member 73 connects the first limiting ring 71 and the second limiting ring 72, and the connecting member 73 fixes the first limiting ring 71 and the second limiting ring 72 to limit the axial and radial displacement of the bellows 1.

[0072] After cooling at the weld between the main product 5 and the bellows joint 2, the welding tooling 3 is removed. Then, it is necessary to detect the airtightness of the welded bellows 1. First, the first limiting ring 71 is sleeved on the circumferential side of one end of the bellows 1 close to the main product 5. After the sleeving is completed, the first limiting ring 71 abuts against the upper step surface of the bellows joint 2 at this end of the bellows 1, thereby preventing the first limiting ring 71 from moving towards the direction of the welding tooling 3 of the bellows 1. Similarly, after the first limiting ring 71 is sleeved, the second limiting ring 72 is sleeved on the end of the bellows 1 close to the welding tooling 3 in the same operation. The second limiting ring 72 abuts against the upper step surface of the bellows joint 2 at this end of the bellows 1, thereby preventing the second limiting ring 72 from moving towards the first limiting ring 71. Then, the connecting member 73 is connected to the first limiting ring 71 and the second limiting ring 72. By tightening the first limiting ring 71 and the second limiting ring 72 through the connecting member 73, since both the first limiting ring 71 and the second limiting ring 72 abut against the upper step surface of the bellows joint 2, they will not move. By adding the fixing tooling 7 around the bellows 1 and performing high-strength limiting on the bellows 1 during the airtightness test, the axial deformation of the bellows 1 can be controlled: ±0.2 mm, and the radial deformation: ±0.2 mm, ensuring that the bellows 1 still has high precision after the airtightness test is completed.

[0073] In one embodiment, as Figure 3 shown, on the side of the first limiting ring 71 and the second limiting ring 72 close to the bellows joint 2, there are inwardly provided stepped abutting surfaces, and the limiting rings abut against the upper step surface of the bellows joint 2 through the stepped abutting surfaces. As Figure 4 shown, one end of the bellows joint 2 for fixing the bellows 1 protrudes outward to form an annular protrusion, and thus a step surface is formed on the bellows joint 2. As Figure 3 shown, on the side of the first limiting ring 71 and the second limiting ring 72 close to the bellows joint 2, there are inwardly provided stepped abutting surfaces. After the installation of the first limiting ring 71 and the second limiting ring 72 on the bellows 1 is completed, the stepped abutting surfaces of the first limiting ring 71 and the second limiting ring 72 abut against the step surface on the bellows joint 2, thereby ensuring that the first limiting ring 71 and the second limiting ring 72 will not approach each other due to the pulling of the connecting member 73, resulting in the deformation of the bellows 1.

[0074] In one embodiment, as Figure 2 and Figure 3 shown, the connecting member 73 is a bolt and the number is multiple. Threaded holes are provided on the first limiting ring 71 and the second limiting ring 72. By screwing the connecting member 73 into the threaded holes on the first limiting ring 71 and the second limiting ring 72, the first limiting ring 71 and the second limiting ring 72 are fixed.

[0075] In one embodiment, the connecting members 73 are arranged at equal intervals, and the arrangement of the connecting members 73 can also provide support for the corrugated pipe 1.

[0076] In one embodiment, the limiting ring is composed of two semi-circular half rings, and the ends of the two semi-circular half rings are connected. Taking Figure 3 the second limiting ring 72 in

[0077] as an example for illustration: Figure 3 As shown, the second limiting ring 72 is divided into two parts, namely two semi-circular half rings. When the two semi-circular half rings are spliced, they can form a complete second limiting ring 72. Further, protruding clamping blocks are provided at both ends of one of the two semi-circular half rings. Correspondingly, clamping grooves adapted to insert the clamping blocks are provided at both ends of the other of the two semi-circular half rings. During use, the clamping blocks at both ends of one half ring can be inserted into the clamping grooves at both ends of the other half ring. Further, threaded holes are provided on the clamping blocks and the inner walls of the clamping grooves. By screwing bolts into the threaded holes on the clamping blocks and the inner walls of the clamping grooves, the two semi-circular half rings can be fixed on the periphery of the threaded pipe.

[0078] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A manufacturing method of a corrugated pipe joint, characterized in that, It includes the following steps: Take straight-edge segments at both ends of the corrugated pipe (1), and use laser welding to weld the corrugated pipe joints (2) at both ends of the corrugated pipe (1); Use the welding fixture (3) and the three-dimensional platform (4) to assemble and fix the corrugated pipe joint (2) at one end of the corrugated pipe (1), so that the corrugated pipe joint (2) at the other end of the corrugated pipe (1) is aligned with the part of the main product (5) for installing the corrugated pipe (1), and then use argon arc welding to weld the main product (5) and the corrugated pipe joint (2) on one side of the main product (5); After the weld cools down, remove the welding fixture (3); Install the fixing fixture (7) on the corrugated pipe (1) to limit the axial and radial directions of the corrugated pipe (1); Use a clamp (6) to install the airtight test fixture at the outlet of the corrugated pipe joint (2), place the main product (5) in a water tank, and introduce 2 Mpa of compressed air, keep the pressure for 15 minutes, and observe that there is no leakage on the surface of the corrugated pipe (1) to be qualified.

2. The manufacturing method of the corrugated pipe joint according to claim 1, characterized in that, In the step of removing the welding fixture (3) after the weld cools down, the weld needs to be cooled to a temperature less than 80 °C before the welding fixture (3) can be removed.

3. The manufacturing method of the corrugated pipe joint according to claim 1, characterized in that, Before using argon arc welding to weld the main product (5) and the corrugated pipe joint (2), wipe and clean the welding joint of the main product (5) and the corrugated pipe joint (2) with alcohol to ensure that there is no any oil stain.

4. The manufacturing method of the corrugated pipe joint according to claim 1, wherein, Using laser welding to weld the corrugated pipe joints (2) at both ends of the corrugated pipe (1) includes: Spot-weld the corrugated pipe joint (2) and the corrugated pipe (1) first, and then use laser welding with filler wire to weld the joint surface.

5. The manufacturing method of the corrugated pipe joint according to claim 4, characterized in that, Welding parameters are: Power: 600 W - 800 W; Wire feeding speed: 220 mm / min - 300 mm / min; Wire feeding delay: 3 s - 5 s; Wire diameter: φ1.6 mm - φ2.0 mm; Welding speed: 6 mm / s - 10 mm / s; Argon gas flow rate: 12 L / min - 15 L / min.

6. A welding tooling for the manufacturing method of the bellows joint according to any one of claims 1-5, characterized in that, It includes: A bottom plate (31), suitable for being fixed on the three-dimensional platform (4); A vertical plate (32), with the bottom end fixed on the bottom plate (31), and a fixing part is provided at the upper end of the vertical plate (32), and the fixing part is suitable for fixing with the corrugated pipe joint (2).

7. The welding tooling according to claim 6, characterized in that, It also includes a reinforcing rib (33), and the reinforcing rib (33) is connected between the bottom plate (31) and the vertical plate (32).

8. A fixing tooling, which is used for the manufacturing method of the corrugated pipe joint according to any one of claims 1-5, and is characterized in that It includes: A first limiting ring (71), suitable for being sleeved on one end of the corrugated pipe (1), and the first limiting ring (71) abuts against the upper step surface of the corrugated pipe joint (2) at this end of the corrugated pipe (1); A second limiting ring (72), suitable for being sleeved on the other end of the corrugated pipe (1), and the second limiting ring (72) abuts against the upper step surface of the corrugated pipe joint (2) at this end of the corrugated pipe (1); A connecting member (73), connecting the first limiting ring (71) and the second limiting ring (72), and the connecting member (73) fixes the first limiting ring (71) and the second limiting ring (72) to limit the axial and radial displacement of the corrugated pipe (1).

9. The fixing tooling according to claim 8, wherein, On the side of the first limiting ring (71) and the second limiting ring (72) close to the corrugated pipe joint (2), a stepped abutting surface is provided inward, and the limiting ring abuts against the stepped surface on the corrugated pipe joint (2) through the stepped abutting surface.

10. The fixing tooling according to claim 8, characterized in that, The limiting ring is composed of two semi-circular half rings, and the ends of the two semi-circular half rings are connected.

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