Welding system

Abstract

The present application provides a welding system, which belongs to the technical field of sealing processing of fuel cladding tubes after irradiation. The welding system comprises a base, a rotating clamping tool, a tail top tool and a welding unit; the rotating clamping tool is arranged on the base, and the rotating clamping tool is used to clamp one end of the cladding tube; the tail top tool is arranged on the base, and the tail top tool is arranged opposite to the rotating clamping tool, and the tail top tool is used to tighten the other end of the cladding tube; the welding unit is arranged on the base; the rotating clamping tool drives the cladding tube to rotate, so that the welding unit welds the circumferential weld at the end of the cladding tube, which can ensure the sealing of the two ends of the cladding tube and avoid pressure leakage or failure of the welds at the two ends of the cladding tube during the internal pressure test.

Description

Technical Field

[0001] The present application belongs to the technical field of sealing processing of fuel cladding tubes after irradiation, and specifically relates to a welding system. Background Art

[0002] After irradiation, the fuel cladding tube needs to undergo internal pressure performance testing, such as internal pressure explosion, internal pressure fatigue and internal pressure creep tests. The internal pressure test of the fuel cladding tube is to fill the cladding tube with liquid or gas medium to conduct ultra-high pressure pressure, long-term pressure alternation and long-term pressure maintenance tests. The sealing of both ends of the cladding tube is the key link and technology of the internal pressure test.

[0003] In the related art, ferrule joints are installed at both ends of the tube body of the cladding tube, and the conical surface on the ferrule joints is used for sealing. During ultra-high pressure pressing, long-term pressure alternation, and long-term pressure maintenance, the pressure will directly act on the ferrule joint, giving the ferrule joint an outward thrust, resulting in poor sealing at the joint between the ferrule joint and the cladding tube, especially when there is an oxide film and deformation on the surface of the cladding tube, resulting in pressure leakage in the cladding tube. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a welding system that can ensure the sealing of both ends of the cladding tube and avoid pressure leakage or failure of the circumferential welds at both ends of the cladding tube during the internal pressure test.

[0005] In order to solve the above problems, the present application provides a welding system, including a base, a rotating clamping tool, a tail top tool and a welding unit;

[0006] The rotating clamping tool is arranged on the base, and the rotating clamping tool is used to clamp one end of the cladding tube; the tail top tool is arranged on the base, and the tail top tool is arranged opposite to the rotating clamping tool, and the tail top tool is used to tighten the other end of the cladding tube; the welding unit is arranged on the base; the rotating clamping tool drives the cladding tube to rotate, so that the welding unit welds the circumferential weld at the end of the cladding tube.

[0007] The rotating clamping tooling includes a chuck, a first base and a spindle, the first base is arranged on the base, a through hole arranged along the X direction is opened on the first base, the spindle is arranged in the through hole, and the spindle rotates relative to the first base, the chuck includes a clamping end and a connecting end, the clamping end of the chuck is used to clamp the cladding tube, the spindle includes a first end and a second end, the connecting end of the chuck is connected to the first end of the spindle, the second end of the spindle is connected to a power component, and the power component is used to drive the spindle to rotate so that the chuck clamping the cladding tube rotates.

[0008] The power assembly includes a transmission assembly and a driving part. The output end of the transmission assembly is connected to the second end of the main shaft, and the input end of the transmission assembly is connected to the driving part.

[0009] The tail top tooling includes a third base, which is arranged on the base, and a second telescopic member is arranged on the top of the third base. The second telescopic member is arranged along the X direction and can be extended or shortened along the X direction. An end plug clamping bracket is arranged at the movable end of the second telescopic member, and an end plug clamping shaft is arranged on the end plug clamping bracket. The end plug clamping shaft is used to clamp the cladding tube, and the end plug clamping shaft rotates relative to the end plug clamping bracket. A shielding gas sleeve bracket is arranged at the fixed end of the second telescopic member, and a shielding gas sleeve assembly is arranged on the shielding gas sleeve bracket. The shielding gas sleeve assembly is used to output shielding gas to form a protective atmosphere at the weld part of the cladding tube where welding is completed.

[0010] The shielding gas sleeve assembly comprises a shielding gas block sleeve and a shielding gas sleeve, wherein one end of the shielding gas sleeve is fixed to the shielding gas sleeve bracket, and the other end is provided with the shielding gas block sleeve, and the shielding gas block sleeve is provided with a vent hole, and the vent hole is used to output shielding gas to form a protective atmosphere at the weld part of the cladding tube after welding.

[0011] The welding unit includes a bracket and a laser welding head, the bracket is arranged on the base, a slide module is arranged on the bracket, the laser welding head is installed on the slide module, the laser welding head is arranged along the Y direction, and the slide module is used to drive the laser welding head to move along the X direction so that the working end of the laser welding head is opposite to the circumferential weld of the cladding tube.

[0012] The welding unit further comprises a position collector, which is disposed on the top of the laser welding head and arranged coaxially with the laser welding head; the position collector is used to determine the position of the girth weld on the cladding tube.

[0013] The welding system further comprises a gas protection unit, which is arranged on the base and located between the welding unit and the rotating clamping fixture, and is used for outputting a protective gas to form a protective atmosphere around a working end of the welding unit.

[0014] The gas protection unit includes a second base, which is arranged on the base, and a first telescopic member is arranged on the second base. The movable end of the first telescopic member is connected to a hinge seat, and a connecting rod seat is arranged on the end surface of the cylinder body of the first telescopic member. The connecting rod seat is hinged to one end of at least one connecting rod, and the other end of the connecting rod and the hinge seat are respectively hinged to the rocker arm. A protection tube positioning seat is arranged at one end of the rocker arm away from the hinge seat, and the protection air pipe passes through the through hole of the protection air pipe positioning seat and is fixed on the protection air pipe positioning seat.

[0015] The welding system further comprises an image acquisition unit, and the image acquisition unit is arranged on the base.

[0016] Beneficial effects:

[0017] In the welding system provided in the embodiment of the present invention, one end of the cladding tube is clamped on the rotating clamping fixture, and then the other end of the cladding tube is clamped by the tail top fixture arranged opposite to the rotating clamping fixture; the light emitting point of the welding unit is adjusted to be aligned with the circumferential weld of the cladding tube, and then the welding unit emits a laser to weld the cladding tube; the cladding tube is driven to rotate by the rotating clamping fixture to complete the welding of the circumferential weld of the cladding tube. In a high-intensity radiation environment, it is convenient for the staff to complete the welding and sealing of the fuel cladding tube after irradiation. The two ends of the cladding tube are welded by the welding system, so that the cladding tube and the end plug are welded as one, which greatly reduces the working time and radiation dose of the staff, improves the efficiency of the internal pressure test of the fuel cladding tube and the progress of project implementation, and solves the technical problems of poor sealing and easy leakage of the internal pressure of the fuel cladding tube during the internal pressure test after irradiation, and has the advantages of simple operation, strong practicality and simple maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A front view of a welding system according to an embodiment of the present application;

[0019] Figure 2 A side view of a welding system according to an embodiment of the present application;

[0020] Figure 3 A top view of a welding system according to an embodiment of the present application;

[0021] Figure 4 A top view of the rotary clamping tooling of an embodiment of the present application;

[0022] Figure 5 This is a left side view of the rotary clamping tooling of the embodiment of the present application;

[0023] Figure 6 It is a right side view of the chuck part of the rotary clamping tooling of the embodiment of the present application;

[0024] Figure 7 A partial cross-sectional view of a chuck of a rotary clamping tool according to an embodiment of the present application;

[0025] Figure 8 This is a front view of the tail top tooling of an embodiment of the present application;

[0026] Fig. 9 A side view of the tail top tooling of an embodiment of the present application;

[0027] Fig.10 A top view of the tail top tooling of an embodiment of the present application;

[0028] Fig.11 This is a front view of a gas protection unit according to an embodiment of the present application;

[0029] Fig.12 A side view of a gas protection unit according to an embodiment of the present application;

[0030] Fig.13 A schematic diagram of a welding unit according to an embodiment of the present application;

[0031] Fig.14 This is an axonometric diagram of a welding system with a cladding tube installed in an embodiment of the present application;

[0032] Fig.15 For the embodiments of this application Fig.14 A partial enlarged schematic diagram of

[0033] Fig.16 This is a schematic diagram of a cladding tube according to an embodiment of the present application.

[0034] The reference numerals are as follows:

[0035] 1-welding unit; 101-laser welding head; 102-bracket; 103-slide module; 104-laser welding head mounting plate;

[0036] 2-rotating clamping tool; 201-chuck; 202-first base; 203-spindle; 204-second synchronous pulley; 205-first synchronous pulley; 206-synchronous belt; 207-driving unit;

[0037] 3-gas protection unit; 301-second base; 302-first telescopic member; 303-connecting rod seat; 304-connecting rod; 305-swing rod; 306-protective gas pipe; 307-hinged seat;

[0038] 4-tail top tooling; 401-third base; 402-second telescopic member; 403-end plug clamping bracket; 404-end plug clamping shaft; 405-protective gas sleeve bracket; 406-protective gas sleeve; 407-protective gas block sleeve; 408-connector; 409-vent;

[0039] 5-image acquisition unit; 501-column; 502-image acquisition device;

[0040] 6- Base;

[0041] 7- Location collector;

[0042] 8- Cladding tube. DETAILED DESCRIPTION

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0047] See also Figures 1 to 3 , Fig.14 and Fig.16 As shown, according to an embodiment of the present application, a welding system is provided, including a base 6, a rotating clamping fixture 2, a tail top fixture 4 and a welding unit 1; the rotating clamping fixture 2 is arranged on the base 6, and the rotating clamping fixture 2 is used to clamp one end of the cladding tube 8; the tail top fixture 4 is arranged on the base 6, and the tail top fixture 4 is arranged opposite to the rotating clamping fixture 2, and the tail top fixture 4 is used to tighten the other end of the cladding tube 8; the welding unit 1 is arranged on the base 6, and the rotating clamping fixture 2 drives the cladding tube 8 to rotate, so that the welding unit 1 welds the circumferential weld at the end of the cladding tube 8.

[0048] Among them, one end of the cladding tube 8 is clamped on the rotating clamping fixture 2, and then the other end of the cladding tube 8 is clamped by the tail top fixture 4 arranged opposite to the rotating clamping fixture 2; the light emitting point of the welding unit 1 is adjusted to be aligned with the circumferential weld of the cladding tube 8, and then the welding unit 1 emits a laser to weld the cladding tube 8; the cladding tube 8 is driven to rotate by the rotating clamping fixture 2 to complete the welding of the circumferential weld of the cladding tube 8. In a high-intensity radiation environment, it is convenient for the staff to complete the welding and sealing of the fuel cladding tube 8 after irradiation. The two ends of the cladding tube 8 are welded by the welding system, so that the cladding tube 8 and the end plug are welded as one, which greatly reduces the working time and radiation dose of the staff, improves the efficiency of the internal pressure test of the fuel cladding tube 8 and the progress of project implementation, and solves the technical problems of poor sealing and easy leakage of the internal pressure of the fuel cladding tube 8 after irradiation. It has the advantages of simple operation, strong practicality and simple maintenance.

[0049] Specifically, the rotating clamping fixture 2 is used to clamp one end of the cladding tube 8, and the tail top fixture 4 is used to tighten the other end of the cladding tube 8. That is to say, when the cladding tube 8 is welded, the cladding tube 8 is clamped by the rotating clamping fixture 2. The cooperation of the rotating clamping fixture 2 and the tail top fixture 4 can avoid the cladding tube 8 from swinging and being unstable during the rotation welding process; the rotating clamping fixture 2 drives the cladding tube 8 to rotate, so that the welding unit 1 welds the girth weld at the end of the cladding tube 8. That is to say, during the welding process, the welding unit 1 is first used to adjust the light emitting point to fall on the girth weld, that is to say, determine the welding position. After the welding position is determined, the cladding tube 8 is driven to rotate by the rotating clamping fixture 2, so that the cladding tube 8 is welded while rotating, thereby ensuring the sealing of the two ends of the cladding tube 8 and improving the welding efficiency.

[0050] Specifically, end plugs are respectively provided at both ends of the cladding tube 8, and the joint between the end cover and the cladding tube 8 is a circumferential weld. The base 6 is made of hard aluminum alloy and has sufficient strength and installation accuracy to support the upper structure.

[0051] like Figures 4 to 7 As shown, the rotating clamping tool 2 includes a chuck 201, a first base 202 and a spindle 203. The first base 202 is arranged on the base 6. A through hole arranged along the X direction is opened on the first base 202. The spindle 203 is arranged in the through hole. The spindle 203 rotates relative to the first base 202. The chuck 201 includes a clamping end and a connecting end. The clamping end of the chuck 201 is used to clamp the cladding tube 8. The spindle 203 includes a first end and a second end. The connecting end of the chuck 201 is connected to the first end of the spindle 203, and the second end of the spindle 203 is connected to the power component. The power component is used to drive the spindle 203 to rotate, so that the chuck 201 holding the cladding tube 8 rotates.

[0052] Among them, a flange is provided at the connecting end of the main shaft 203, and the chuck 201 is connected to the flange at the connecting end of the main shaft 203 by bolts. The connection between the chuck 201 and the main shaft 203 is realized through the design of the flange, so that the chuck 201 can drive the cladding tube 8 to rotate while clamping the cladding tube 8.

[0053] Specifically, the chuck 201 is a pneumatic chuck. The clamping surface of the clamping claw on the chuck 201 is arc-shaped, and the end plug of the cladding tube 8 is clamped by the arc-shaped clamping surface to prevent damage to the end plug.

[0054] Among them, Figure 5 As shown, a through hole arranged along the X-axis direction is opened on the first base 202, and a main shaft 203 is arranged in the through hole. In order to reduce the friction between the main shaft 203 and the through hole, angular contact ball bearings are installed at both ends of the outer peripheral surface of the main shaft 203, and a main bearing sleeve is mounted on the outer peripheral surface of the main shaft 203 between the two angular contact ball bearings. A main shaft pressure cover is also arranged on the outer peripheral surface of the main shaft 203, and the main shaft pressure cover is fixed to the shoulder end face of the main shaft 203 by bolts, and the inner ring of the angular contact ball bearing is axially positioned by the shoulder of the main shaft 203, the main bearing sleeve and the main shaft pressure cover; a main shaft bearing cover is mounted on the main shaft 203 outside the bearing cover, and the main shaft bearing cover is fixed to the first base 202 by bolts, so as to axially position the outer ring of the angular contact ball bearing and play a role of dustproof sealing.

[0055] In specific use, the cladding tube 8 is clamped by the pneumatic chuck 201 to achieve rapid clamping and automatic centering of the cladding tube 8; the power component drives the main shaft 203 to rotate, and then drives the chuck 201 to rotate through the main shaft 203, and then the cladding tube 8 clamped on the chuck 201 rotates synchronously with the chuck 201.

[0056] The power assembly includes a transmission assembly and a driving unit 207 . The output end of the transmission assembly is connected to the second end of the main shaft 203 , and the input end of the transmission assembly is connected to the driving unit 207 .

[0057] Among them, the output end of the transmission component is connected to the second end of the main shaft 203, that is, the transmission component is used to transmit power to the main shaft 203, and the input end of the transmission component is connected to the driving part 207, that is, the driving part 207 is used to provide driving force for the rotation of the chuck 201.

[0058] In other embodiments, the driving unit 207 may be directly connected to the second end of the main shaft 203 through a coupling according to specific circumstances.

[0059] Specifically, the driving unit 207 includes a reducer and a servo motor. The output end of the servo motor is connected to the input end of the reducer. The reducer has the purpose of reducing the rotation speed and increasing the torque.

[0060] Specifically, the transmission assembly includes a first synchronous pulley 205, a second synchronous pulley 204 and a synchronous belt 206. The first synchronous pulley 205 is installed at the output end of the reducer, and the second synchronous pulley 204 is installed at the second end of the main shaft 203 and is located on the outside of the main shaft bearing cover. The first synchronous pulley 205 and the second synchronous pulley 204 are connected through the synchronous belt 206.

[0061] like Figures 8 to 10 As shown, the tail top tooling 4 includes a third base 401, and the third base 401 is arranged on the base 6. A second telescopic member 402 is arranged on the top of the third base 401. The second telescopic member 402 is arranged along the X direction and can be extended or shortened along the X direction. The movable end of the second telescopic member 402 is provided with an end plug clamping bracket 403, and the end plug clamping bracket 403 is provided with an end plug clamping shaft 404. The end plug clamping shaft 404 is used to clamp the cladding tube 8, and the end plug clamping shaft 404 rotates relative to the end plug clamping bracket 403. A shielding gas sleeve bracket 405 is provided at the fixed end of the second telescopic member 402, and a shielding gas sleeve assembly is provided on the shielding gas sleeve bracket 405. The shielding gas sleeve assembly is used to output shielding gas to form a protective atmosphere in the weld part of the cladding tube 8 where welding is completed.

[0062] Among them, the bottom end of the end plug clamping bracket 403 is installed on the movable end of the second telescopic member 402 by bolts, and an axis mounting hole is opened at the top of the end plug clamping bracket 403, and a bearing is installed in the axis mounting hole. An end plug clamping shaft 404 is installed in the inner ring of the bearing, and the end plug clamping shaft 404 extends to the outer side of the end plug clamping bracket 403 toward one end of the protective gas sleeve assembly, which is used to tighten the cladding tube 8, and plays the function of horizontally centering the cladding tube 8, and at the same time ensures that the cladding tube 8 is not eccentric during the welding rotation process. The end of the end plug clamping shaft 404 is screwed with a nut away from the protective gas sleeve assembly. The nut is used to locate the axial position of the inner ring of the bearing to prevent the bearing from axial movement during the rotation of the end plug clamping shaft 404; an end plug clamping bearing cover is provided on the end plug clamping bracket 403 by bolts, and the end plug clamping bearing cover is arranged close to the nut, which is used to locate the axial position of the outer ring of the bearing, and at the same time plays a role in sealing and dustproofing.

[0063] The protective gas sleeve bracket 405 is a rectangular plate, the bottom end of which is fixed to the fixed end face of the second telescopic member 402 by bolts, and the top end is processed with a semicircular notch for installing the protective gas sleeve assembly.

[0064] Specifically, in this embodiment, the second telescopic member 402 is a cylinder, and in other embodiments, it may also be an electric push rod or a hydraulic cylinder, etc. according to specific working conditions.

[0065] In specific use: after one end of the cladding tube 8 is clamped on the chuck 201 of the rotating clamping fixture 2, the movable end of the second telescopic member 402 is retracted, that is, the piston rod of the second telescopic member 402 is retracted into the cylinder body, so that the end plug pressing shaft 404 is pressed against the other end of the cladding tube 8, and the cladding tube 8 is clamped between the rotating clamping fixture 2 and the tail top fixture 4. The cooperation between the rotating clamping fixture 2 and the tail top fixture 4 not only avoids the problem of the cladding tube 8 swinging or being unstable, but also can adapt to cladding tubes 8 of different lengths, and has strong versatility.

[0066] like Fig.15 As shown, the shielding gas sleeve assembly includes a shielding gas block sleeve 407 and a shielding gas sleeve 406. One end of the shielding gas sleeve 406 is fixed to the shielding gas sleeve bracket 405, and the other end is provided with a shielding gas block sleeve 407. The shielding gas block sleeve 407 is provided with a vent hole 409. The vent hole 409 is used to output shielding gas to form a protective atmosphere in the weld part of the cladding tube 8 where welding is completed.

[0067] Among them, the protective gas block sleeve 407 and the protective gas sleeve 406 are processed with semicircular grooves on the side facing the cladding tube 8 to form a protective gas groove, and the protective gas groove is located at the lower semicircle position of the circumferential weld;

[0068] The outer surfaces of the protective gas block sleeve 407 and the protective gas sleeve 406 are both arc-shaped;

[0069] A flange is provided at one end of the protective gas block sleeve 407, and the protective gas block sleeve 407 is overlapped on the semicircular groove of the protective gas sleeve 406 (that is, the inner diameter of the protective gas block sleeve 407 is smaller than the inner diameter of the protective gas sleeve 406, and the outer diameter of the protective gas block sleeve 407 is equal to the inner diameter of the protective gas sleeve 406), and the flange is pressed against the end face of the protective gas sleeve 406, and the flange is fixed to the protective gas sleeve 406 by bolts; the outer surface of the protective gas sleeve 406 is arc-shaped and matched with the protective gas sleeve bracket 405, and at the same time, a flange is provided at one end of the protective gas sleeve 406 where the protective gas block sleeve 407 is not installed, which is used to be connected to the end face of the protective gas sleeve bracket 405 by bolts, and the detachable connection method is convenient for the later repair and maintenance of the protective gas block sleeve 407 and the protective gas sleeve 406.

[0070] The flange end face on the protective gas sleeve 406 is also provided with a cladding tube initial positioning block, that is, after the cladding tube 8 is installed between the rotating clamping tooling 2 and the tail top tooling 4, at least part of the cladding tube 8 is located on the cladding tube initial positioning block, which is used to initially locate the position of the cladding tube 8 and also plays a role in supporting the cladding tube 8.

[0071] Specifically, the protective gas block sleeve 407 is provided with ventilation holes 409 arranged along the circumferential direction, and the outer surface of the protective gas sleeve 406 is provided with a joint 408, one end of the joint 408 is connected to each ventilation hole 409, and the other end is connected to the gas source.

[0072] When the cladding tube 8 is installed between the rotating clamping fixture 2 and the tail top fixture 4, a gap is formed between the outer peripheral surface of the cladding tube 8 and the protective gas groove, allowing the protective gas to concentrate at the bottom of the protective gas groove to form a protective atmosphere for protecting the weld of the cladding tube 8 that has solidified but not cooled, and preventing oxidation of the weld surface.

[0073] like Fig.13 As shown, the welding unit 1 includes a bracket 102 and a laser welding head 101. The bracket 102 is arranged on the base 6. A slide module 103 is arranged on the bracket 102. The laser welding head 101 is installed on the slide module 103. The laser welding head 101 is arranged along the Y direction. The slide module 103 is used to drive the laser welding head 101 to move along the X direction so that the working end of the laser welding head 101 is facing the circumferential weld of the cladding tube 8.

[0074] The laser on the laser welding head 101 uses a quasi-continuous fiber laser, and the laser is output in the form of high-frequency pulses, and the optical fiber transmits the laser. The reason for using a quasi-continuous laser is to increase the stirring capacity of the welding molten pool, accelerate the precipitation of bubbles, and improve the welding quality. In addition, pulse welding reduces the input of welding heat, that is, reduces welding deformation, which is very suitable for thin plate welding. The laser uses an RFL-QCW300 / 3000 laser.

[0075] Laser welding head 101 adopts a swinging laser welding head, that is, a two-dimensional galvanometer is used to swing the laser beam in a specified pattern, swing frequency, and swing amplitude. The reason for using a swinging laser welding head is that the increased bridging capacity is suitable for welding of certain gap welds, the stability of the keyhole is improved, the welding stability is improved, the fluidity of the molten pool is increased, the welding porosity is reduced or eliminated, the welding quality is improved, and the welding deformation is reduced, which is very suitable for thin plate welding; laser welding head 101 adopts ND60 swing welding head.

[0076] The connecting part of the laser welding head 101 is provided with a laser welding head mounting plate 104, and the laser welding head 101 is installed on the slide module 103 through the laser welding head mounting plate 104. The light output point position of the laser welding head 101 is adjusted through the slide module 103 so that it is aligned with the circumferential weld on the cladding tube 8.

[0077] The welding unit 1 further comprises a position collector 7 , which is disposed on the top of the laser welding head 101 and is coaxially arranged with the laser welding head 101 ; the position collector 7 is used to determine the position of the girth weld on the cladding tube 8 .

[0078] The position collector is a CCD camera, and the welding position is confirmed by the CCD camera before welding, that is, the position of the girth weld is determined.

[0079] Specifically, the slide module 103 is a manual slide, which cooperates with the position collector 7 to determine the welding position.

[0080] like Fig.11 and Fig.12 As shown, the welding system also includes a gas protection unit 3, which is arranged on a base 6 and located between the welding unit 1 and the rotating clamping tooling 2. The gas protection unit 3 is used to output a protective gas to form a protective atmosphere around the working end of the welding unit 1.

[0081] The gas outlet end of the gas protection unit 3 faces the circumferential weld of the cladding tube 8 and is located on the side of the laser welding head 101 to form welding protection in the molten pool area.

[0082] The gas protection unit 3 includes a second base 301, which is arranged on the base 6. A first telescopic member 302 is arranged on the second base 301. The movable end of the first telescopic member 302 is connected to a hinge seat 307. A connecting rod seat 303 is arranged on the end face of the cylinder body of the first telescopic member 302. The connecting rod seat 303 is hinged to one end of at least one connecting rod 304. The other end of the connecting rod 304 and the hinge seat 307 are respectively hinged to the rocker arm 305. A protection tube positioning seat is arranged at one end of the rocker arm 305 away from the hinge seat 307. The protection gas pipe 306 passes through the through hole of the protection gas pipe positioning seat and is fixed on the protection gas pipe positioning seat.

[0083] Among them, the hinged seat 307 is arranged at the movable end of the first telescopic member 302, that is to say, the extension or shortening of the first telescopic member 302 can move the hinged seat 307 upward or downward; the hinged seat 307 and the connecting rod 304 are hinged on the swing rod 305 at the same time, that is to say, the hinged seat 307 is hinged to one end of the swing rod 305, and the connecting rod 304 is hinged at the middle part of the swing rod 305 to form a fulcrum for the swing of the swing rod 305, that is, when the first telescopic member 302 is extended, the swing rod 305 rotates counterclockwise, and the air outlet end of the protective air pipe 306 moves downward; conversely, when the first telescopic member 302 is retracted, the swing rod 305 rotates clockwise, and the air outlet end of the protective air pipe 306 moves upward; no matter whether the air outlet end of the protective air pipe 306 moves upward or downward, it is to adjust the air outlet end of the protective air pipe 306 to be able to blow close to the circumferential weld to form a protective atmosphere to avoid oxidation during welding.

[0084] Specifically, the gas outlet of the protective gas pipe 306 is bent toward the second base 301 so that the gas outlet end faces the molten pool area and the end away from the second base 301 is connected to the gas source.

[0085] In this embodiment, the gas introduced into the vent hole 409 of the tail top tooling 4 and the protective gas pipe 306 of the gas protection unit 3 are both argon gas.

[0086] In this embodiment, the first telescopic member 302 is a cylinder. In other embodiments, it can also be set as an electric push rod or a hydraulic cylinder, etc. according to specific working conditions.

[0087] The welding system also includes an image acquisition unit 5, which is arranged on a base 6. The image acquisition unit 5 is used to observe the preparation work before welding and the entire welding process, so as to find problems in time, respond quickly and reduce losses.

[0088] The welding system also includes a control system arranged outside the radioactive room and a manipulator in the radioactive room, wherein the manipulator is used to realize automatic loading and unloading and adjust the slide module 103, and the control system is electrically connected to the welding unit 1, the rotating clamping tool 2, the tail top tool 4, the gas protection unit 3, the position collector, the image acquisition unit 5 and the manipulator, respectively, and the control system is used to control the clamping, tail top, constant speed rotation, selection and adjustment of the welding process, and establishment of the protective atmosphere of the cladding tube 8. The operation process of the overall device is simple and has strong practicality. It realizes automated control, improves production efficiency, and also greatly reduces the stagnation time of the staff in the radioactive room, ensuring the personal safety of the staff.

[0089] The specific use process of the welding system is:

[0090] The cladding tube 8 is installed on the rotating clamping fixture 2, and the end plug at one end of the cladding tube 8 is fixed on the pneumatic chuck 201 by pneumatic tightening. The pneumatic chuck 201 is locked. At this time, one end of the cladding tube 8 is in a tightened state; when the pneumatic chuck 201 is locked, the tail lifting fixture 4 is synchronously pressed against the other end of the cladding tube 8, so that the tail lifting fixture 4 and the pneumatic chuck 201 are in a straight line;

[0091] The driving part 207 works to drive the cladding tube 8 to perform a rotational motion; while performing the rotational motion, the first telescopic member 302 adjusts the protective gas pipe 306 to the welding position. During the welding process, the position of the welding protection zone is adjustable; the molten pool is protected during welding;

[0092] Before welding, the welding protection zone will be purged for 30 seconds and protected by argon gas. The laser of the welding unit 1 emits light, and the light is emitted through the laser welding head 101. The cladding tube 8 is welded according to the correct welding process (including swing parameters, welding power, rotation speed, defocus parameters, welding position, etc.). Before welding, the welding position is confirmed by the position collector, that is, the coaxial position collector is used to observe and adjust the light emission position of the laser welding head 101 above the circumferential weld by adjusting the slide module 103. After welding, the cladding tube 8 is turned to weld the other end. After welding, the welding area is cooled and protected by the protective gas pipe 306. After cooling, the silver-white welding effect is the best state.

[0093] After welding, the tail top fixture 4 and the rotating clamping fixture 2 are reset, the cladding tube 8 is removed, and the welding is completed.

[0094] The welding system provided in the present application can completely solve the problem of sealing the internal pressure test of the cladding tube 8 after irradiation by laser welding and sealing, can realize the welding of the N36 zirconium alloy tube and the end plug and ensure the welding quality and stability, and can be widely used in the welding and sealing of the fuel cladding tube 8 after irradiation or the welding of similar structural materials, and has good application prospects. It has the function of quickly and safely welding and sealing the fuel cladding tube 8 after irradiation, shortening the operation time and reducing the radiation dose value of personnel. At the same time, the welding system has a compact structure and realizes modular assembly and disassembly, which is conducive to installation and replacement of structural components in a limited space in a radioactive environment. The parts of the present application have a simple structure, are easy to process, and have low manufacturing and installation costs.

[0095] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0096] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A welding system, characterized in that: include: Base (6); A rotating clamping tool (2), the rotating clamping tool (2) being arranged on the base (6), the rotating clamping tool (2) being used to clamp one end of the cladding tube (8); A tail top tooling (4), the tail top tooling (4) being arranged on the base (6), the tail top tooling (4) being arranged opposite to the rotating clamping tooling (2), and the tail top tooling (4) being used to tighten the other end of the cladding tube (8); A welding unit (1), the welding unit (1) being arranged on the base (6); The rotating clamping fixture (2) drives the cladding tube (8) to rotate, so that the welding unit (1) welds the girth weld at the end of the cladding tube (8); The tail top tooling (4) comprises a third base (401), the third base (401) is arranged on the base (6), a second telescopic member (402) is arranged on the top of the third base (401), the second telescopic member (402) is arranged along the X direction and can be extended or shortened along the X direction, an end plug pressing bracket (403) is arranged at the movable end of the second telescopic member (402), an end plug pressing shaft (404) is arranged on the end plug pressing bracket (403), the end plug pressing shaft (404) is used to press the cladding tube (8), the end plug pressing shaft (404) rotates relative to the end plug pressing bracket (403), a protective gas sleeve bracket (405) is arranged at the fixed end of the second telescopic member (402), a protective gas sleeve assembly is arranged on the protective gas sleeve bracket (405), and the protective gas sleeve assembly is used to output protective gas to form a protective atmosphere at the weld part of the cladding tube (8) where welding is completed; The rotating clamping tool (2) comprises a chuck (201), a first base (202) and a spindle (203), wherein the first base (202) is arranged on the base (6), a through hole arranged along the X direction is opened on the first base (202), the spindle (203) is arranged in the through hole, and the spindle (203) rotates relative to the first base (202), the chuck (201) comprises a clamping end and a connecting end, the clamping end of the chuck (201) is used to clamp the cladding tube (8), the spindle (203) comprises a first end and a second end, the connecting end of the chuck (201) is connected to the first end of the spindle (203), and the second end of the spindle (203) is connected to a power assembly, and the power assembly is used to drive the spindle (203) to rotate, so as to rotate the chuck (201) clamping the cladding tube (8); The shielding gas sleeve assembly comprises a shielding gas block sleeve (407) and a shielding gas sleeve (406); one end of the shielding gas sleeve (406) is fixed to the shielding gas sleeve bracket (405); the other end is provided with the shielding gas block sleeve (407); a vent (409) is provided on the shielding gas block sleeve (407); the vent (409) is used to output shielding gas to form a shielding atmosphere at a weld portion of the cladding tube (8) where welding is completed; The welding system further comprises a gas protection unit (3), the gas protection unit (3) being arranged on the base (6) and located between the welding unit (1) and the rotating clamping fixture (2), the gas protection unit (3) being used for outputting a protective gas to form a protective atmosphere around a working end of the welding unit (1); The gas protection unit (3) comprises a second base (301), the second base (301) being arranged on the base (6), a first telescopic member (302) being arranged on the second base (301), a movable end of the first telescopic member (302) being connected to a hinge seat (307), a connecting rod seat (303) being arranged on an end surface of a cylinder body of the first telescopic member (302), the connecting rod seat (303) being hinged to one end of at least one connecting rod (304), the other end of the connecting rod (304) and the hinge seat (307) being hinged to a swing rod (305) respectively, a protection tube positioning seat being arranged at one end of the swing rod (305) away from the hinge seat (307), and a protection gas tube (306) passing through a through hole of the protection gas tube positioning seat and being fixed on the protection gas tube positioning seat.

2. The welding system according to claim 1, characterized in that The power assembly comprises a transmission assembly and a driving part (207), wherein an output end of the transmission assembly is connected to the second end of the main shaft (203), and an input end of the transmission assembly is connected to the driving part (207).

3. The welding system according to claim 2, characterized in that: The welding unit (1) comprises a bracket (102) and a laser welding head (101); the bracket (102) is arranged on the base (6); a slide module (103) is arranged on the bracket (102); the laser welding head (101) is mounted on the slide module (103); the laser welding head (101) is arranged along the Y direction; the slide module (103) is used to drive the laser welding head (101) to move along the X direction so that the working end of the laser welding head (101) faces the circumferential weld of the cladding tube (8).

4. The welding system according to claim 3, characterized in that The welding unit (1) further comprises a position collector (7), the position collector (7) being arranged on the top of the laser welding head (101) and being coaxially arranged with the laser welding head (101); the position collector (7) is used to determine the position of the girth weld on the cladding tube (8).

5. The welding system according to claim 1, characterized in that: The welding system further comprises an image acquisition unit (5), wherein the image acquisition unit (5) is arranged on the base (6).

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