Thin-wall metal pipe welding equipment and welding method

Abstract

The present invention relates to the technical field of welding equipment, and in particular to a thin-walled metal pipe welding equipment and a welding method, comprising a butt joint ring located between two metal pipes and used for welding the two metal pipes together, a driving unit for providing rotational power to the butt joint ring, and two pushing units for respectively providing pushing forces to the two metal pipes, wherein the pushing forces provided to the metal pipes by the pushing units are along the axial direction of the metal pipes; by utilizing the butt joint ring to simultaneously perform relative frictional movement with the two metal pipes, the butt joint ring and the two metal pipes can be simultaneously welded and connected, thereby achieving the connection of the two metal pipes; at the same time, utilizing the tapered surfaces on both end faces of the butt joint ring to expand the end faces of the two metal pipes, the contact area between the metal pipes and the butt joint ring can be increased, thereby improving the welding strength; this welding method will not cause welding defects such as weld penetration and breakage, and its welding firmness is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and in particular to a thin-walled metal pipe welding device and a welding method. Background Art

[0002] With the rapid development of modern industry towards lightweight and high precision, thin-walled metal pipes are increasingly widely used in energy transportation, aerospace, automobile manufacturing and precision instruments due to their advantages of light weight, high material utilization and compact structure. For example, hydrogen energy storage and transportation systems require highly sealed thin-walled pipes, spacecraft propulsion pipelines have strict requirements on high temperature resistance and fatigue resistance, and microelectronic radiators rely on the precision molding and connection of ultra-thin pipes.

[0003] In the process of processing or assembling thin-walled metal pipes, butt welding of metal pipes is a common processing method. The traditional welding method is to butt two metal pipes together, and then use laser welding, electric welding, etc. to weld the butt joints together. However, due to the small wall thickness of the metal pipe, the traditional welding method is prone to welding defects such as weld penetration and breakage. In addition, the connection area of ​​the two metal pipes is small, resulting in low welding strength. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a thin-walled metal pipe welding device and welding method, the specific technical solution adopted by the present invention is:

[0005] According to a first aspect of the present invention, there is provided a thin-walled metal pipe welding device, comprising a butt joint ring positioned between two metal pipes and used to weld the two metal pipes together, a drive unit for providing rotational power to the butt joint ring, and two pushing units for respectively providing a pushing force to the two metal pipes, wherein the pushing force provided by the pushing units to the metal pipes is along the axis of the metal pipes.

[0006] Both end surfaces of the butt joint ring along its own axial direction are configured as conical surfaces, and the conical surfaces are used to squeeze the end of the metal tube and expand and deform it.

[0007] In some embodiments of the present invention, both end surfaces of the docking ring along its own axial direction are provided with extension portions for inserting into corresponding metal tubes, and the extension portions are in contact with the inner wall of the metal tube.

[0008] In some embodiments of the present invention, a concave area is provided inside the docking ring.

[0009] In some embodiments of the present invention, the driving unit includes a ring body 1, a plurality of support rollers distributed circumferentially around the ring body and used to support the ring body 1, a driving motor and a transmission wheel for providing power for the rotation of the ring body 1, and a clamping group for clamping the docking ring is provided in the ring body 1.

[0010] In some embodiments of the present invention, the clamping group includes a second ring body disposed within the first ring body, an annular groove is provided on the inner circumferential wall of the second ring body, the inner wall of the annular groove has a thread, an externally threaded ring connected to the thread is provided in the annular groove, the externally threaded ring is provided with a plurality of oblique grooves, and a guide post is slidably provided in the oblique grooves;

[0011] A plurality of top columns are slidably provided on the ring body 2, and the top columns move along the radial direction of the ring body 2, and the guide columns are connected to the top columns;

[0012] Wherein, the ring body 2 is provided with a plurality of top screws for squeezing and fixing the external threaded ring.

[0013] In some embodiments of the present invention, a plurality of pressing edges are provided on the end of the top column, and a plurality of embossings are provided on the circumferential outer wall of the docking ring.

[0014] In some embodiments of the present invention, the second ring body slides inside the first ring body along the axis of the first ring body, and both ends of the first ring body are provided with retaining edges for limiting the second ring body.

[0015] In some embodiments of the present invention, the pushing unit includes a base, two side pulling bodies relatively slidably arranged on the base, and a plurality of clamping groups located between the two side pulling bodies, wherein the clamping groups are used to fix the metal pipe;

[0016] The holding group includes two opposite soft belts, each of which is composed of a pressing area and a plurality of pressing areas located at each end of the pressing area. The plurality of pressing areas on the two soft belts intersect with each other, and the pressing areas are fixed to the side pulling body.

[0017] Wherein, the base is provided with a plurality of oil cylinders for providing power for its movement.

[0018] In some embodiments of the present invention, the sliding direction of the side pull body on the base is inclined, and the sliding directions of the two side pull bodies are opposite;

[0019] The base is also provided with a supporting platform for lifting the bottom of each soft belt.

[0020] In a second aspect, a thin-walled metal pipe welding method is provided, using the thin-walled metal pipe welding apparatus described above, comprising the following steps:

[0021] Fix the docking ring to the drive unit;

[0022] Fix the two metal tubes on the two pushing units respectively;

[0023] Move the pushing unit so that the end of the metal tube abuts against the end of the docking ring, and the end of the metal tube contacts the conical surface of the docking ring;

[0024] The driving unit drives the rotating docking ring to generate relative friction between the docking ring and the metal tube, causing the conical surface and the end of the metal tube to heat up and soften;

[0025] The pushing unit provides thrust to the metal tube, causing the softened part of the metal tube end to expand and deform using the conical surface, thereby increasing the contact area between the metal tube and the docking ring;

[0026] The butt joint ring is rotated continuously, so that the end of the metal pipe and the butt joint ring undergo plastic flow and are connected together under the action of extrusion force, and the two metal pipes are welded together through the butt joint ring.

[0027] The beneficial effects of the present invention are:

[0028] By utilizing the simultaneous relative friction movement between the butt joint ring and the two metal pipes, the butt joint ring and the two metal pipes can be welded and connected simultaneously, thereby realizing the connection of the two metal pipes. At the same time, the tapered surfaces on the two end faces of the butt joint ring are used to expand the end faces of the two metal pipes, which can increase the contact area between the metal pipes and the butt joint ring, thereby improving the welding strength. This welding method will not cause welding defects such as weld penetration and breakage, and its welding firmness is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 Schematic diagram of the butt joint state of the metal tube and the butt joint ring according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the cross-sectional structure of the docking ring in an embodiment of the present invention;

[0033] Figure 4 yes Figure 1 Schematic diagram of the explosion structure;

[0034] Figure 5 is a schematic structural diagram of a drive unit in an embodiment of the present invention;

[0035] Figure 62 is a schematic cross-sectional view of the ring body 1 and the clamping group in an embodiment of the present invention;

[0036] Figure 7 This is a schematic structural diagram of a pushing unit in an embodiment of the present invention;

[0037] Figure 8 is a schematic structural diagram of a holding group according to an embodiment of the present invention;

[0038] Figure 9 Schematic diagram of the exploded structure of the clamping group in an embodiment of the present invention.

[0039] Reference numerals:

[0040] 100. Metal pipe;

[0041] 200, docking ring; 201, tapered surface; 202, extension portion; 203, concave area; 204, embossing;

[0042] 300, drive unit; 301, ring body 1; 302, support roller; 303, drive motor; 304, transmission wheel; 305, clamping group; 306, ring body 2; 307, ring groove; 308, external thread ring; 309, inclined groove; 310, guide column; 311, top column; 312, top screw; 313, pressure edge; 314, rib;

[0043] 400, pushing unit; 401, base; 402, side pull body; 403, soft belt; 404, sheet pressing area; 405, belt pressing area; 406, oil cylinder; 407, moving base; 408, two-way cylinder; 409, piston rod; 410, support platform;

[0044] 500, rack. DETAILED DESCRIPTION

[0045] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0046] like Figures 1 to 4 As shown, a thin-walled metal pipe welding device of the present invention includes a butt joint ring 200 located between two metal pipes 100 and used for welding the two metal pipes 100 together, a driving unit 300 for providing rotational power to the butt joint ring 200, and two pushing units 400 for respectively providing a pushing force to the two metal pipes 100. The pushing force provided by the pushing units 400 to the metal pipes 100 is along the axis direction of the metal pipes 100.

[0047] Both end surfaces of the butt-joint ring 200 along its own axis are configured as conical surfaces 201, and the conical surfaces 201 are used to squeeze the end of the metal tube 100 and expand and deform it;

[0048] In the present invention, the driving unit 300 and the two pushing units 400 can be installed on the frame 500 to facilitate providing a fixed position for the two metal pipes 100; the two metal pipes 100 are welded together through the docking ring 200, and the material used for the docking ring 200 is the same as that of the metal pipe 100; the shape of the two end surfaces of the docking ring 200 is the setting direction of the conical surface 201, and when the pushing unit 400 pushes the metal pipe 100 to squeeze and contact the docking ring 200, the conical surface 201 can expand the end of the metal pipe 100, thereby increasing the contact area between the metal pipe 100 and the docking ring 200, thereby improving the welding strength. Of course, the deformation of the end of the metal pipe 100 is carried out under the condition of its temperature rising and softening; the driving unit 300 can provide rotational power for the docking ring 200, thereby enabling the docking ring 200 and the metal pipe 100 to rotate relative to each other, and utilizing the friction between the docking ring 200 and the metal pipe 100 to achieve softening welding of the docking position of the metal pipe 100 and the docking ring 200;

[0049] When in use, the docking ring 200 is fixed on the driving unit 300, and the two metal tubes 100 are respectively in contact with the two end surfaces of the docking ring 200, and the metal tubes 100 are fixed on the corresponding pushing units 400. The pushing units 400 can provide auxiliary thrust for the metal tubes 100 and the docking ring 200. When the driving unit 300 drives the docking ring 200 to rotate at a high speed, the docking ring 200 and the ends of the metal tubes 100 move relative to each other and generate heat through friction, and the ends of the metal tubes 100 soften. Due to the squeezing force between the metal tube 100 and the conical surface 201, the conical surface 201 can expand the ends of the metal tubes 100, so that the ends of the metal tubes 100 are deformed and the contact area between them and the docking ring 200 is increased. The friction and high temperature between the metal tubes 100 and the docking ring 200 are used to achieve the welding connection between the metal tubes 100 and the docking ring 200; the docking ring 200 also moves relative to the two metal tubes 100 through friction, so the two metal tubes 100 can be welded together using the docking ring 200;

[0050] It should be noted that, since the conical surfaces 201 at both ends of the butt-joint ring 200 respectively abut against the ends of the two metal tubes 100, the welding positions of the butt-joint ring 200 and the metal tube 100 are mainly concentrated on the conical surfaces 201, and not the entire butt-joint ring 200 needs to be heated for connection;

[0051] By utilizing the simultaneous relative friction movement between the butt joint ring 200 and the two metal tubes 100, the butt joint ring 200 and the two metal tubes 100 can be welded and connected simultaneously, thereby achieving the connection of the two metal tubes 100. At the same time, the tapered surfaces 201 on the two end surfaces of the butt joint ring 200 are used to expand the end surfaces of the two metal tubes 100, thereby increasing the contact area between the metal tubes 100 and the butt joint ring 200, thereby improving the welding strength. This welding method will not cause welding defects such as weld penetration and damage, and its welding firmness is effectively improved.

[0052] In some embodiments of the present invention, Figure 3 As shown, both end surfaces of the docking ring 200 along its own axial direction are provided with extension portions 202 for inserting into the corresponding metal tube 100, and the extension portions 202 are in contact with the inner wall of the metal tube 100;

[0053] When the metal pipe 100 is butted against the butt-jointing ring 200, the extension 202 on the butt-jointing ring 200 can be inserted into the metal pipe 100. The extension 202 thereby supports the portion of the metal pipe 100 that contacts the tapered surface 201, thereby increasing the contact area between the metal pipe 100 and the butt-jointing ring 200. When the end of the metal pipe 100 is deformed by heat, the extension 202 can support the portion of the metal pipe 100 near the end of the metal pipe 100, preventing that portion of the metal pipe 100 from being deformed or compressed by heat. This improves the smoothness of the welded portion of the metal pipe 100. Furthermore, the extension 202 can guide the metal pipe 100 as it is conveyed toward the butt-jointing ring 200.

[0054] It should be noted that the inner wall of the metal tube 100 may also undergo relative friction movement with the extension portion 202 , thereby increasing the friction deformation area of ​​the metal tube 100 .

[0055] In some embodiments of the present invention, a concave area 203 is provided inside the docking ring 200;

[0056] like Figure 3 As shown, the provision of the concave area 203 can reduce the material used in the docking ring 200, making the overall weight of the docking ring 200 smaller and reducing costs, and can also reduce the internal heat storage and heat conduction of the docking ring 200, thereby reducing the temperature loss in the friction area of ​​the docking ring 200;

[0057] It should be pointed out that the overall wall thickness of the docking ring 200 is consistent, and it is processed in an integrated manner by stamping or other methods during processing. This can simplify the processing method of the docking ring 200, and the shape of the docking ring 200 can be directly stamped out using a section of the specified pipeline; the stamping process can be carried out by mechanical stamping or hydraulic expansion or other methods.

[0058] In some embodiments of the present invention, Figure 5As shown, the drive unit 300 includes a ring body 301, a plurality of support rollers 302 distributed circumferentially around the ring body 301 and used to support the ring body 301, a drive motor 303 and a transmission wheel 304 for providing power for the rotation of the ring body 301, and a clamping group 305 for clamping the docking ring 200 is provided in the ring body 301;

[0059] Each support roller 302 can be installed on the frame 500. The setting of several support rollers 302 can provide support for the ring body 301, and in order to limit the movement of the ring body 301 along its own axial direction, a baffle is set at the end of each support roller 302 to block the ring body 301; the driving motor 303 is installed on the frame 500, and the transmission wheel 304 is installed on the output end of the driving motor 303, and the transmission wheel 304 is connected to the ring body 301 in a transmission manner. In this way, the driving motor 303 and the transmission wheel 304 can provide power for the rotational movement of the ring body 301, and the ring body 301 then drives the docking ring 200 to rotate through the clamping group 305, thereby realizing the welding connection between the docking ring 200 and the two metal pipes 100.

[0060] In some embodiments of the present invention, Figure 6 As shown, the clamping assembly 305 includes a second ring body 306 disposed within the first ring body 301. The inner wall of the second ring body 306 is provided with an annular groove 307. The inner wall of the annular groove 307 has a thread. An externally threaded ring 308 connected to the thread is disposed within the annular groove 307. The externally threaded ring 308 is provided with a plurality of oblique grooves 309. A guide post 310 is slidably disposed within the oblique grooves 309.

[0061] A plurality of top posts 311 are slidably provided on the second ring body 306 , and the top posts 311 move along the radial direction of the second ring body 306 , and the guide posts 310 are connected to the top posts 311 ;

[0062] The second ring body 306 is provided with a plurality of top screws 312 for squeezing and fixing the external threaded ring 308;

[0063] In the present invention, the first ring body 301 transmits the rotational power directly to the second ring body 306, and the second ring body 306 can drive the docking ring 200 to rotate through its internal structure, thereby realizing power transmission; the ring groove 307 provides a mounting position for the external threaded ring 308, and by using a threaded connection method, when the external threaded ring 308 moves in the ring groove 307, the external threaded ring 308 can rotate; a plurality of top columns 311 are distributed circumferentially around the axis of the second ring body 306, and the top columns 311 are slidably mounted on the inner side wall of the ring groove 307, and the sliding direction of the top columns 311 is along the radial direction of the second ring body 306; the setting of the inclined groove 309 can push the guide column 310 towards or away from the axis of the second ring body 306 when the external threaded ring 308 rotates, thereby providing power for the movement of the top columns 311;

[0064] When in use, the worker pushes the push column 311 to a position far away from the axis of the ring body 306. At this time, the push column 311 can use the inclined groove 309 and the guide column 310 to rotate the external threaded ring 308. When the docking ring 200 needs to be fixed, the push screw 312 can be tightened to make the push screw 312 reversely squeeze the external threaded ring 308. The external threaded ring 308 uses its upper inclined groove 309 and the guide column 310 to push the push column 311 toward the docking ring 200. Several push columns 311 move synchronously, thereby achieving the extrusion and fixation of the docking ring 200; the function of the push screw 312 is to squeeze and lock the position of the external threaded ring 308 to prevent it from moving at will; the rotation of the push screw 312 can be achieved by the worker directly twisting it, or it can be achieved by other methods such as a motor.

[0065] In some embodiments of the present invention, Figure 3 and Figure 6 As shown, the end of the top column 311 is provided with a plurality of pressing edges 313, and the outer circumferential wall of the docking ring 200 has a plurality of embossings 204;

[0066] The pressing edge 313 on the top column 311 and the embossing 204 on the docking ring 200 are used in conjunction with each other. When the pressing edge 313 is inserted into the corresponding embossing 204, the docking ring 200 is restricted in both its circumferential direction and axial direction, thereby preventing the docking ring 200 and the top column 311 from sliding relative to each other and ensuring that the docking ring 200 can rotate smoothly.

[0067] In some embodiments of the present invention, the second ring body 306 slides inside the first ring body 301 along the axis of the first ring body 301 , and both ends of the first ring body 301 are provided with retaining edges 314 for limiting the second ring body 306 ;

[0068] Since the two pushing units 400 provide relative pushing forces for the two metal tubes 100, the metal tubes 100 can be brought into contact with the docking ring 200. In order to ensure balanced extrusion forces between the docking ring 200 and the two metal tubes 100, the docking ring 200 can be freely movable along its own axis. Thus, the extrusion and pushing force of one pushing unit 400 on the metal tube 100 is directly transmitted to the other metal tube 100 and the other pushing unit 400 through the docking ring 200, thereby ensuring that the overlap amount of the metal tubes 100 on the docking ring 200 and the welding area remain consistent.

[0069] Since the ring body 1 301 needs to drive the ring body 2 306 to rotate, and the ring body 2 306 can move inside the ring body 1 301, a plurality of transverse teeth can be provided on the inner wall of the ring body 1 301 and the outer wall of the ring body 2 306, such as Figure 6As shown, a plurality of edges can be provided on the inner wall of the ring body 1 301, and a plurality of sliding grooves for use with the edges can be provided on the outer wall of the ring body 2 306, thereby achieving the purpose of sliding and rotating the ring body 2 306 on the ring body 1 301; the setting of the retaining edge 314 can prevent the ring body 2 306 from sliding and falling off on the ring body 1 301.

[0070] In some embodiments of the present invention, Figures 7 to 9 As shown, the pushing unit 400 includes a base 401, two side pull bodies 402 relatively slidably disposed on the base 401, and a plurality of clamping groups located between the two side pull bodies 402, and the clamping groups are used to fix the metal pipe 100;

[0071] The holding group includes two opposite soft belts 403, which are composed of a pressing area 404 and a plurality of pressing areas 405 located at each end of the pressing area 404. The plurality of pressing areas 405 on the two soft belts 403 intersect with each other, and the pressing areas 405 are fixed to the side pulling body 402.

[0072] The base 401 is provided with a plurality of oil cylinders 406 for providing power for its movement;

[0073] The base 401 can provide support for the pulling bodies 402 on both sides; since the pushing unit 400 needs to provide thrust for the metal pipe 100, the base 401 can be slidably mounted on the frame 500, and the oil cylinder 406 can provide power for the movement of the base 401, and the fixed end of the oil cylinder 406 can be mounted on the frame 500; since the clamping group 305 can move laterally within the ring body 1 301, one base 401 can be fixedly connected to the frame 500, and the other base 401 can be slidably connected to the frame 500, so that the movable setting of one base 401 can realize the extrusion work of the docking ring 200 and the two metal pipes 100;

[0074] The pulling bodies 402 on both sides can provide support for the multiple clamping groups therebetween, and the mutual approach or distance of the pulling bodies 402 on both sides can drive the two corresponding soft belts 403 in the clamping group to move relative to each other; since the soft belt 403 is composed of a pressing area 404 and multiple pressing areas 405, the soft belt 403 can be wrapped around the outer wall of the metal tube 100. Of course, the wrapping method can be a spiral winding method with multiple turns, or it can be as follows Figure 8 As shown, only a local area of ​​the outer wall of the metal tube 100 in the circumferential direction is wrapped, and the two soft belts 403 are used in conjunction with each other to achieve a comprehensive wrapping of the circumference of the metal tube 100; Figure 8 As shown, when the two ends of the soft belt 403 are close to each other, the wrapping areas of the two soft belts 403 on the metal tube 100 overlap;

[0075] The cross-arrangement of the plurality of pressing zones 405 on the two soft belts 403 allows the two soft belts 403 to move relative to each other. When the pulling bodies 402 on both sides move away from each other, they can pull the two soft belts 403 in the holding group to move relative to each other. In this way, the two soft belts 403 can fully squeeze and fix the circumferential outer wall of the metal tube 100, thereby avoiding stress concentration and deformation of the metal tube 100. The pressing zone 404 on one soft belt 403 is located on the inner side of the other soft belt 403. The use of the pressing zone 404 can maximize the contact area between the soft belt 403 and the metal tube 100.

[0076] The soft belt 403 is at least one of a steel belt, a pull belt and the like.

[0077] In some embodiments of the present invention, Figure 7 As shown, the sliding direction of the side pull body 402 on the base 401 is inclined, and the sliding directions of the pull bodies 402 on both sides are opposite;

[0078] The base 401 also has a support 410 for lifting the bottom of each soft belt 403;

[0079] The inclined movement of the side pulling bodies 402 can make the side pulling bodies 402 move in both the horizontal and vertical directions. The horizontal movement of the side pulling bodies 402 can realize the clamping or loosening of the metal pipe 100 by the clamping group. The vertical movement of the side pulling bodies 402 can pull the metal pipe 100 downward and make the bottom of the soft belt 403 contact with the support 410, thereby achieving the extrusion and fixation of the metal pipe 100 in the spatial direction, avoiding the shaking of the metal pipe 100 due to the elasticity of the soft belt 403 itself, and improving the fixing strength of the metal pipe 100.

[0080] In order to fix the horizontal position of the metal tube 100, the pull bodies 402 on both sides need to be able to move synchronously, as shown in FIG. Figure 7 As shown, a movable seat 407 is vertically slidably provided on the side wall of the base 401, and a two-way cylinder 408 is horizontally fixed on the movable seat 407. Piston rods 409 are extended from both ends of the two-way cylinder 408, and the two piston rods 409 are respectively connected to the pulling bodies 402 on both sides. In this way, the telescopic movement of the two piston rods 409 in the two-way cylinder 408 can be realized by hydraulic means, and when one side pulling body 402 moves in the vertical direction, it will drive the movable seat 407 and the other side pulling body 402 to move synchronously.

[0081] A thin-walled metal pipe welding method, using the above-mentioned thin-walled metal pipe welding equipment, includes the following steps:

[0082] Fix the docking ring 200 to the drive unit 300;

[0083] Fix the two metal tubes 100 on the two pushing units 400 respectively;

[0084] Move the pushing unit 400 so that the end of the metal tube 100 abuts against the end of the docking ring 200 , and the end of the metal tube 100 contacts the tapered surface 201 on the docking ring 200 ;

[0085] The driving unit 300 is used to drive the rotating docking ring 200, so that relative friction motion is generated between the docking ring 200 and the metal pipe 100, and the conical surface 201 and the end of the metal pipe 100 are heated and softened;

[0086] The pushing unit 400 provides thrust to the metal tube 100, causing the softened portion of the end of the metal tube 100 to expand and deform due to the conical surface 201, thereby increasing the contact area between the metal tube 100 and the docking ring 200;

[0087] The butt joint ring 200 is continuously rotated, so that the end of the metal pipe 100 and the butt joint ring 200 undergo plastic flow under the action of the extrusion force and are connected together, and the two metal pipes 100 are welded together through the butt joint ring 200.

[0088] By using the above method, the welding connection work of the two thin-walled metal tubes 100 can be achieved, and the contact area during welding can be increased, thereby improving the welding strength.

[0089] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A thin-walled metal pipe welding device, characterized in that: It includes a butt joint ring located between two metal tubes and used for welding the two metal tubes together, a driving unit for providing rotational power to the butt joint ring, and two pushing units for providing pushing forces to the two metal tubes respectively, wherein the pushing forces provided by the pushing units to the metal tubes are along the axis of the metal tubes; Both end surfaces of the butt joint ring along its own axis are set as conical surfaces, and the conical surfaces are used to squeeze the end of the metal tube and expand and deform it; The driving unit includes a ring body 1, a plurality of support rollers distributed circumferentially around the ring body and used to support the ring body 1, a driving motor and a transmission wheel used to provide power for the rotation of the ring body 1, and a clamping group for clamping the docking ring is provided in the ring body 1; Both end surfaces of the docking ring along its own axis are provided with extension portions for inserting into the corresponding metal tube, and the extension portions are in contact with the inner wall of the metal tube; The docking ring is provided with a concave area inside; The pushing unit includes a base, two side pulling bodies relatively slidably arranged on the base, and a plurality of clamping groups located between the two side pulling bodies, wherein the clamping groups are used to fix the metal pipe; The holding group includes two opposite soft belts, each of which is composed of a pressing area and a plurality of pressing areas located at each end of the pressing area. The plurality of pressing areas on the two soft belts intersect with each other, and the pressing areas are fixed to the side pulling body. Wherein, the base is provided with a plurality of oil cylinders for providing power for its movement; The sliding direction of the side pulling body on the base is inclined, and the sliding directions of the two side pulling bodies are opposite; The base is also provided with a supporting platform for lifting the bottom of each soft belt.

2. The thin-walled metal pipe welding equipment according to claim 1, characterized in that: The clamping group includes a second ring body arranged in the first ring body, a ring groove is provided on the inner wall of the circumference of the second ring body, a thread is provided on the inner wall of the ring groove, an external thread ring connected to the thread is provided in the ring groove, a plurality of oblique grooves are provided on the external thread ring, and a guide column is slidably provided in the oblique groove; A plurality of top columns are slidably provided on the ring body 2, and the top columns move along the radial direction of the ring body 2, and the guide columns are connected to the top columns; Wherein, the ring body 2 is provided with a plurality of top screws for squeezing and fixing the external threaded ring.

3. The thin-walled metal pipe welding equipment according to claim 2, characterized in that: The end of the top column is provided with a plurality of pressing edges, and the circumferential outer wall of the docking ring is provided with a plurality of embossings.

4. The thin-walled metal pipe welding equipment according to claim 3, characterized in that: The second ring body slides inside the first ring body along the axis direction of the first ring body, and both ends of the first ring body are provided with retaining edges for limiting the second ring body.

5. A thin-walled metal pipe welding method, using a thin-walled metal pipe welding device according to any one of claims 1 to 4, characterized in that: The steps include: Fix the docking ring to the drive unit; Fix the two metal tubes on the two pushing units respectively; Move the pushing unit so that the end of the metal tube abuts against the end of the docking ring, and the end of the metal tube contacts the conical surface of the docking ring; The driving unit drives the rotating docking ring to generate relative friction between the docking ring and the metal tube, causing the conical surface and the end of the metal tube to heat up and soften; The pushing unit provides thrust to the metal tube, causing the softened part of the metal tube end to expand and deform using the conical surface, thereby increasing the contact area between the metal tube and the docking ring; The butt joint ring is rotated continuously, so that the end of the metal pipe and the butt joint ring undergo plastic flow and are connected together under the action of extrusion force, and the two metal pipes are welded together through the butt joint ring.

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