A pressure resistance welding device

Abstract

The application discloses a pressure resistance welding device, which comprises a rack and a welding device installed in the middle of the surface of the rack. The welding device comprises a welding cavity, which is processed with a welding channel. A forging die air claw is arranged in the middle of the welding channel. A pressing piston is sleeved on one side of the forging die air claw. A first feeding mechanism is installed on the outside of the pressing piston. An end plug transmission device is installed on the side of the welding cavity far from the feeding mechanism. A conductive belt is installed in the welding channel. A die aligned with the welding position is arranged in the welding channel on one side of the conductive belt. A detection device is arranged on the rack. A second feeding mechanism is installed on one end of the detection device. The first feeding mechanism and the end plug transmission device enter the welding device. The first feeding mechanism and the end plug transmission device are kept. The conductive belt in the welding device generates high temperature to instantaneously weld and form the end plug and the fuel rod, which will not appear defects such as air hole and collapse compared with the existing single-point welding.

Description

Technical Field

[0001] This invention relates to the field of nuclear fuel element manufacturing, and in particular to a pressure resistance welding apparatus. Background Technology

[0002] In current nuclear fuel element manufacturing, the welding of the cladding tube and end plug on the fuel rod uses TIG welding, which involves single-point welding of the cladding tube and end plug using a tungsten electrode under inert gas protection. However, the fuel rod needs to be welded across its entire circumference. During welding, the fuel rod needs to be rotated while the tungsten electrode performs circumferential welding. At the end of each circumference, the endpoint must coincide with the starting point. If this coincidence is incomplete, defects such as porosity may occur. To prevent porosity, current welding methods involve slightly more rotation. However, this can lead to the tungsten electrode re-welding the already welded seam, causing weld collapse. Furthermore, the relative position of the cladding tube and the weld seam during welding is easily affected by circumferential runout during rotation. Changes in weld position can result in defects such as protrusions, depressions, or porosity in the welded appearance. Additionally, the wear of the tungsten electrode is highly unstable, easily leading to non-compliant geometric dimensions and material properties of the welded fuel rod.

[0003] In the current manufacturing of nuclear fuel components, the fuel rod manufacturing process involves sequentially performing plugging (also known as end plug assembly), circumferential welding, and weld inspection. Each process is completed by independent equipment, which makes it difficult to improve the production efficiency of fuel rods and requires a certain number of specialized workers to perform the corresponding operations, thus increasing the production costs of enterprises. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure resistance welding device that adopts a new welding method, avoids defects such as protrusions, depressions or pores in the welding, ensures the welding effect of fuel rods, and can automatically complete the pressing, welding and inspection operations of fuel rods, greatly improving the production efficiency of fuel rods.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A pressure resistance welding apparatus includes a frame and a welding device mounted on the middle of the frame surface. The welding device includes a welding cavity with a horizontal welding channel. A forging die gripper is located in the middle of the welding channel. A clamping piston is fitted inside the welding channel on one side of the forging die gripper. A first feeding mechanism for conveying fuel rods is mounted on the frame outside the clamping piston. The first feeding mechanism is arranged along the length of the welding channel. One end of the clamping piston is provided with a rubber clamping sleeve of the outer wall profile that can be pressed against the fuel rod. The forging die gripper is used to clamp the fuel rod conveyed by the feeding mechanism. An end plug conveying device is mounted on the side of the welding cavity away from the feeding mechanism. The end plug conveying device includes a base, an upsetting cylinder, a pressure sensor, a linear guide rail, a clamping seat, a hollow suction column, and an electrode blank. The base is mounted on the frame. The upsetting cylinder is horizontally mounted on the base, and the piston rod of the upsetting cylinder can extend toward the welding cavity. The linear guide rail is installed between the upsetting cylinder and the welding cavity. The clamping seat is mounted on the linear guide rail. The pressure sensor is installed near the clamping seat. The hollow suction column is horizontally mounted on the side wall of the clamping seat near the welding cavity, and is coaxial with the welding channel. A sealing ring that mates with the outer wall of the hollow suction column is provided within the welding channel. A vacuum pipe interface connected to the hollow suction column is machined on the clamping seat. The electrode blank is installed at the end of the hollow suction column and is used to position the end plug, gripping it with the vacuum pipe interface. An electrode plate connected to the hollow suction column is provided on the clamping seat. The upsetting cylinder drives the hollow suction column. The end plug extends into the welding channel and makes close contact with the fuel rod. The welding cavity on the side of the forging die gas gripper away from the pressing piston is provided with a gas port for conveying inert gas. A conductive strip is installed in the welding channel at the gas port. A mold aligned with the welding position is provided in the welding channel on one side of the conductive strip. Under the limitation of the mold, the current transmitted by the conductive strip is used to weld the calciner and the fuel rod together. A detection device is provided on the frame. The detection device is installed on the frame surface on one side of the welding channel. A second feeding mechanism for conveying fuel rods is installed at one end of the detection device.

[0007] A vibratory feeder for sorting end plugs is provided on a frame on one side of the electrode blank. The outlet of the vibratory feeder is connected to an arrangement track, and a robotic arm is installed at the outlet of the arrangement track. The robotic arm transfers the calcination into the electrode blank.

[0008] The bottom of the electrode contact plate extends downward into the frame. The frame surface below the linear guide rail is machined with a clearance groove to avoid the electrode contact plate. The linear guide rail is provided with a corrugated cover that wraps around the clearance groove.

[0009] The rubber clamp is conical, with its large-diameter end installed in the welding channel and its small-diameter end connected to the clamping piston.

[0010] The first feeding mechanism has the same structure as the second feeding mechanism, including two guide wheels and a linear servo track installed between the guide wheels. The guide wheels are rotatably mounted on the frame via brackets, and a gripper cylinder for clamping fuel rods is installed on the linear servo track.

[0011] The detection device includes a rotator, a limiting cylinder, and a camera. The rotator is installed on the outer side of one end of the second feeding mechanism. The rotator has a through hole for the fuel rod to pass through, and a clamping sleeve is provided in the through hole to hold the fuel rod. The limiting cylinder is installed on the side of the rotator away from the second feeding mechanism. A stop block aligned with the end plug is installed on the telescopic shaft of the limiting cylinder. The camera is vertically installed on the frame near the rotator via a support frame, and the camera is aligned with the welded joint of the end plug and the fuel rod.

[0012] The beneficial effects of the pressure resistance welding device provided by this invention are:

[0013] (1) By setting a first feeding mechanism and an end plug transmission device to enter the welding device, under the holding of the first feeding mechanism and the end plug transmission device, and under the limitation of the mold, the high temperature generated by the conductive strip in the welding device makes the end plug and fuel rod instantly welded together, and can prevent the overflow of the welding molten material, ensuring the size of the weld, so that the weld will not protrude or sink. At the same time, the welding is achieved by overall melting, which will not cause defects such as porosity and collapse compared with the existing single-point welding. In addition, the overall welding eliminates the process of rotating the fuel rod, effectively ensuring the coaxiality of the end plug and the shell tube.

[0014] (2) By setting rubber clamps and sealing rings in the welding channel of the welding device, the sealing during welding can be guaranteed, so as to facilitate the filling of inert gas into the welding channel to ensure the quality of welding.

[0015] (3) By setting up a detection device on one side of the welding device, the weld position can be detected in a timely manner after welding, which shortens the welding detection process and improves the welding efficiency of fuel rods. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Structural illustration provided for embodiments of the present invention Figure 1 .

[0018] Figure 2 Structural illustration provided for embodiments of the present invention Figure 2 .

[0019] Figure 3 This is an assembly diagram of the welding device, the first feeding mechanism, and the end plug transmission device provided in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the welding apparatus provided in an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the internal structure of the welding device provided in the vertical direction according to an embodiment of the present invention.

[0022] Figure 6 This is a radial internal structure diagram of the welding device provided in an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the axial internal structure of the welding device provided in an embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the first feeding mechanism provided in an embodiment of the present invention.

[0025] Figure 9 This is a schematic diagram of the end plug transmission device provided in an embodiment of the present invention.

[0026] Figure 10 This is a schematic diagram of the axial internal structure of the end plug transmission device provided in an embodiment of the present invention.

[0027] Figure 11 This is a schematic diagram of the installation of the detection device and the second feeding mechanism provided in an embodiment of the present invention.

[0028] Figure 12 This is a schematic diagram of the internal structure of the detection device provided in an embodiment of the present invention.

[0029] Reference numerals: 1. Frame; 11. Clearance groove; 2. Welding device; 201. Welding cavity; 202. Welding channel; 203. Forging die pneumatic gripper; 204. Clamping piston; 205. Rubber clamp; 206. Air port; 207. Conductive strip; 208. Die; 209. Sealing ring; 210. High-pressure air interface; 3. First feeding mechanism; 31. Guide wheel; 32. Linear servo track; 33. Gripper cylinder; 4. End plug transmission device; 401. Base; 40 2. Upsetting cylinder; 403. Pressure sensor; 404. Linear guide rail; 405. Clamping seat; 406. Hollow suction column; 407. Electrode billet; 408. Vibratory feeder; 409. Arrangement track; 410. Robotic arm; 411. Electrode contact plate; 412. Corrugated cover; 413. Vacuum pipe interface; 5. Detection device; 51. Rotator; 52. Through hole; 53. Jacket; 54. Limit cylinder; 55. Camera; 6. Second feeding mechanism; 7. Fuel rod. Detailed Implementation

[0030] Example

[0031] like Figures 1-12 As shown, the pressure resistance welding apparatus provided in this embodiment includes a frame 1 and a welding device 2 installed in the middle of the surface of the frame 1, as follows: Figures 4-7 As shown, the welding device 2 includes a welding cavity 201, which has a horizontal welding channel 202. The welding channel 202 is the welding point of the welding machine. A forging die gripper 203 is provided in the middle of the welding channel 202. The forging die gripper 203 is used to fix the fuel rod. A clamping piston 204 is installed inside the welding channel 202 on one side of the forging die gripper 203. A first feeding mechanism 3 for conveying fuel rods 7 is installed on the frame 1 outside the clamping piston 204. The first feeding mechanism 3 is arranged along the length of the welding channel 202. One end of the clamping piston 204 is provided with a rubber clamp 205 that can be pressed against the outer wall of the fuel rod 7. The rubber clamp 205 is conical, and the large-diameter end of the rubber clamp 205 is installed in the welding channel 202. Inside the weld chamber 201, the small-diameter end of the rubber clamp 205 is connected to the clamping piston 204. A high-pressure gas port 210 is provided on the weld chamber 201 at the clamping piston 204. The high-pressure gas port 210 is used to push the clamping piston 204 to move within the weld channel, and during this movement, it causes the rubber clamp 205 to deform, thus clamping and sealing the fuel rod 7. The deformation of the rubber clamp 205 also improves the airtightness of the weld channel 202, ensuring that inert gas leakage is prevented when inert gas is injected during welding. The forging die gas gripper 203 is used to clamp the end of the fuel rod 7 conveyed by the first feeding mechanism 3, completing the radial positioning of the fuel rod to facilitate alignment of the end plug with the fuel rod. An end plug transmission device 4 is installed on the side of the weld chamber 201 away from the feeding mechanism. Figure 8 , Figure 9As shown, the end plug transfer device 4 includes a base 401, an upsetting cylinder 402, a pressure sensor 403, a linear guide rail 404, a clamping seat 405, a hollow suction column 406, and an electrode blank 407. The base 401 is mounted on the frame 1. The upsetting cylinder 402 is horizontally mounted on the base 401, and the piston rod of the upsetting cylinder 402 can extend toward the welding cavity 201. The linear guide rail 404 is installed between the upsetting cylinder 402 and the welding cavity 201. The clamping seat 405 is installed on the linear guide rail 404. The pressure sensor 403 is installed on the side of the clamping seat 405 near the upsetting cylinder 402 and is in contact with the upsetting cylinder 402. The pressure sensor 403 can determine the contact status of the end plug with the fuel rod 7. The hollow suction column 406 is horizontally mounted on the side wall of the clamping seat 405 near the welding cavity 201, and is coaxially arranged with the welding channel 202. A sealing ring 209 is provided inside the welding channel 202, which mates with the outer wall of the hollow suction column 406. The sealing ring 209 contacts the outer wall of the hollow suction column 406 after the end plug and fuel rod 7 come into contact, creating a sealed environment inside the welding channel 202 to prevent leakage when inert gas is introduced. A vacuum pipe interface 413 is machined on the clamping seat 405, communicating with the hollow suction column 406. The electrode blank 407 is installed at the end of the hollow suction column 406 and is used to position the end plug, engaging with the vacuum pipe interface 413 to hold the end plug in place. The hollow suction column 406 is conductive. Made of a certain material, the clamping base 405 is equipped with an electrode contact plate 411 connected to the hollow suction column 406. The bottom of the electrode contact plate 411 extends downward into the interior of the frame 1 and connects to the welding machine inside the frame 1. The surface of the frame 1 below the linear guide rail 404 is machined with a clearance groove 11 to avoid the electrode contact plate 411. The clearance groove 11 prevents the electrode contact plate 411 from interfering with the movement of the clamping base 405. The linear guide rail 404 is equipped with a corrugated cover 412 that covers the clearance groove 11. The corrugated cover 412 can form a protection to prevent foreign objects from entering the interior of the frame 1 and causing dangerous situations such as electric sparks when the welding machine is powered on. The forging cylinder 402 drives the end plug on the hollow suction column 406 to extend into the welding channel 202 and tightly connect with the fuel rod 7. The welding cavity 201 of the forging die gripper 203, located away from the clamping piston 204, is equipped with two inert gas ports 206. These ports ensure the purity of the inert gas during filling by alternating feeding and discharge. A conductive strip 207 is installed within the welding channel 202 at the ports 206. The electrode plate 411, hollow suction column 406, electrode blank 407, and conductive strip 207 form a circuit for transmitting high current in a short time. This high current heats the connection between the fuel rod 7 and the end plug, welding them together. A mold 208, aligned with the welding position, is located within the welding channel 202 on one side of the conductive strip 207. The mold 208 limits the welding position of the fuel rod 7 and the end plug.Under the constraint of mold 208, the current transmitted by conductive strip 207 welds the calcined fuel rod 7 together. Simultaneously, mold 208 also limits the weld joint to prevent molten weld material from overflowing. A detection device 5 is installed on the frame 1, mounted on the surface of the frame 1 on one side of the welding channel 202. After welding, the welded fuel rod 7 is moved to the detection device 5 for weld inspection. A second feeding mechanism 6 for conveying the fuel rod 7 is installed at one end of the detection device 5. A controller is also installed on the frame 1, connected to sensors of various specifications. These sensors detect the workpiece's position and welding condition. The installation and connection of the sensors are existing technology and will not be described in detail here. To protect the welding device 2, end plug transmission device 4, and detection device 5, for example... Figure 2 As shown, the frame 1 is equipped with a protective cover for the welding device 2, an end plug transfer device 4, and a detection device 5.

[0032] To facilitate end plug installation, such as Figure 9 As shown, a vibratory plate 408 for sorting end plugs is provided on the frame 1 on one side of the electrode blank 407. The outlet of the vibratory plate 408 is connected to an arrangement track 409. A robot arm 410 is installed at the outlet of the arrangement track 409. The robot arm 410 transfers the calcination into the electrode blank 407. The robot arm 410 is existing technology and will not be described in detail here.

[0033] To facilitate the transfer of fuel rod 7, such as Figure 8 , Figure 11 , Figure 12 As shown, the first feeding mechanism 3 and the second feeding mechanism 6 have the same structure, including two guide wheels 31 and a linear servo track 32 installed between the guide wheels 31. The guide wheels 31 are rotatably mounted on the frame 1 by a bracket. The two guide wheels 31 are used to support the fuel rods 7. A gripper cylinder 33 is installed on the linear servo track 32 to clamp the fuel rods 7. After clamping the fuel rods 7, the gripper cylinder 33 uses the linear servo track 32 to drive the fuel rods 7 to move on the guide wheels 31 to complete the work of the fuel rods 7.

[0034] To facilitate the inspection of fuel rod 7 after welding, such as Figure 11 , Figure 12As shown, the detection device 5 includes a rotator 51, a limiting cylinder 54, and a camera 55. The rotator 51 is installed on the outer side of one end of the second feeding mechanism 6. A through hole 52 is machined on the rotator 51 for the fuel rod 7 to pass through. After the welded fuel rod 7 is delivered into place by the second feeding mechanism 6 through the through hole 52, a clamp 53 is provided in the through hole 52 to clamp the fuel rod 7. The limiting cylinder 54 is installed on the side of the rotator 51 away from the second feeding mechanism 6. A stop block aligned with the end plug is installed on the telescopic shaft of the limiting cylinder 54. The camera 55 is vertically mounted on the limiting cylinder via a support frame. On the frame 1 near the rotator 51, the camera 55 is aligned with the weld joint of the end plug and fuel rod 7. After the jacket 53 clamps the fuel rod 7, it can make the fuel rod 7 rotate with the rotator 51. The rotator 51 can be connected to the motor through transmission components such as belts and gears. The motor drives the rotator 51 to rotate, which makes it convenient for the camera 55 to measure the weld to determine whether the weld is qualified. At the same time, based on the data captured by the camera 55, the maximum, minimum and average values ​​of the height and width of the weld can be calculated, which can provide parameters for key process data during equipment operation.

[0035] The method of using this invention is as follows:

[0036] In use, fuel rod 7 (fuel rod 7 consists of a casing tube and a spring fitted inside the casing tube, which is welded to the end of the casing tube during calcination) is placed on the first feeding mechanism 3. The first feeding mechanism 3 feeds fuel rod 7 into the welding channel 202. After fuel rod 7 is in place, high-pressure gas is supplied through high-pressure gas interface 210. The high-pressure gas pushes the clamping piston 204 to move. When the clamping piston 204 moves, it drives the rubber clamp 205 to clamp fuel rod 7. At the same time, the forging die gas claw 203 clamps the end of fuel rod 7, completing the clamping and positioning operation of fuel rod 7. At this time, the end of fuel rod 7 is placed in the mold 208. Meanwhile, the vibratory feeder 408 will... After multiple end plugs are sorted, they are fed into the robot arm 410 along the linear guide rail 404. The robot arm 410 picks up one end plug and sends it into the electrode blank 407. At this time, the vacuum pipe interface 413 draws out the air from the hollow suction column 406, creating a negative pressure inside the hollow suction column 406. The negative pressure is used to adsorb the end plug onto the electrode blank 407. Then, the upsetting cylinder 402 extends and sends the end plug into the welding channel 202, making the end plug contact with the fuel rod 7. At this time, both the end plug and the fuel rod 7 are located in the mold 208. After the end plug contacts the fuel rod 7, the pressure sensor 403 will detect an increase in pressure. At this time, a 99% purity gas is injected into the welding channel 202 through the air port 206.Helium gas with a volume ratio of 996% is used. When the helium pressure reaches 3 MPa, the forging cylinder 402 starts applying pressure again. The forging pressure ranges from 2000 N to 5000 N, with a set value of 3200 N. After the welding conditions are met, the welding machine discharges, and the current forms a circuit through the conductive strip 207, electrode blank 407, hollow suction column 406, and electrode contact plate 411. The contact surface of the fuel rod 7 and the end plug is heated by a short time and a high current. Combined with the forging force of the forging cylinder 402, the welding operation of the fuel rod 7 and the end plug is completed. After welding, the welding machine is powered off, and the weld is allowed to cool and solidify. Under the limit of the mold 208, the weld melt at the weld joint can be prevented from overflowing. At the same time, the mold 208 can also fix the geometry of the weld, which can effectively solve the defects such as protrusions and depressions in the weld in the prior art. After welding is completed, the inert gas is discharged through the air port 206, and then the forging die gripper 203 is released, and the top cylinder is reset. The robotic arm 410 then installs another end plug on the electrode blank 407 for the next welding operation. The first feeding mechanism 3 removes the fuel rod 7 from the welding channel 202, and then places the welded fuel rod 7 on the second feeding mechanism 6. The second feeding mechanism 6 feeds the welded fuel rod 7 into the detection device 5 for weld inspection. During inspection, the second feeding mechanism 6 passes the welded fuel rod 7 through the through hole 52, so that the end plug on the fuel rod 7 contacts the limiting cylinder 54. At this time, the weld is located below the camera 55. If the weld position is deviated, the position of the weld can be adjusted by the limiting cylinder 54. Then, the fuel rod 7 is clamped by the clamp 53 on the rotator 51, so that the rotator 51 can drive the fuel rod 7 to rotate. Next, the camera 55 detects the height and width of the weld and stores the relevant parameters. Then, a new fuel rod 7 to be welded is placed on the first feeding mechanism 3 for the next welding operation.

[0037] Compared with existing single-point welding, this solution has the advantages of fast welding speed, no defects such as porosity and collapse in the weld, and eliminates the process of rotating fuel rod 7 during welding, so that the coaxiality of the end plug and fuel rod 7 is better maintained after welding.

[0038] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications and substitutions based on the technical solutions and inventive concepts provided by the present invention should be covered within the scope of protection of the present invention. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and the present invention omits descriptions of well-known components, processing technologies, and processes to avoid unnecessarily limiting the present invention.

Claims

1. A pressure resistance welding apparatus, characterized in that: The device includes a frame and a welding apparatus mounted on the middle of the frame surface. The welding apparatus includes a welding cavity with a horizontal welding channel. A forging die gripper is located in the middle of the welding channel. A clamping piston is fitted inside the welding channel on one side of the forging die gripper. A first feeding mechanism for conveying fuel rods is mounted on the frame outside the clamping piston. The first feeding mechanism is arranged along the length of the welding channel. One end of the clamping piston is equipped with a rubber clamping sleeve made of profile material that can adhere to the outer wall of the fuel rod. The forging die gripper is used to clamp the fuel rods conveyed by the feeding mechanism. An end-plug transmission device is mounted on the side of the welding cavity away from the feeding mechanism. The end-plug transmission device includes a base, an upsetting cylinder, a pressure sensor, a linear guide rail, a clamping seat, a hollow suction column, and an electrode blank. The base is mounted on the frame, and the upsetting cylinder is horizontally mounted on the base. The piston rod of the upsetting cylinder can extend towards the welding cavity. The linear guide rail is installed between the upsetting cylinder and the welding cavity. The clamping seat is mounted on the linear guide rail, and the pressure sensor is installed on the clamping seat near the upsetting cylinder. The hollow suction column is horizontally mounted on the side wall of the clamping seat near the welding cavity, and is coaxial with the welding channel. The welding channel is equipped with a sealing ring that matches the outer wall of the hollow suction column. The clamping seat is machined with a vacuum pipe interface that communicates with the hollow suction column. The electrode blank is installed at the end of the hollow suction column. The electrode blank is used to position the end plug and is used to suck the end plug in conjunction with the vacuum pipe interface. The clamping seat is equipped with an electrode plate that connects to the hollow suction column. The upforging cylinder drives the end plug on the hollow suction column to extend into the welding channel and make close contact with the fuel rod. The welding cavity on the side of the forging die claw away from the pressing piston is equipped with an air port for conveying inert gas. A conductive strip is installed in the welding channel at the air port. A mold aligned with the welding position is installed in the welding channel on one side of the conductive strip. Under the limitation of the mold, the current transmitted by the conductive strip is used to weld the calcined fuel rod together. The frame is equipped with a detection device, which is installed on the frame surface on one side of the welding channel. A second feeding mechanism for conveying fuel rods is installed at one end of the detection device.

2. The pressure resistance welding apparatus according to claim 1, characterized in that: A vibratory feeder for sorting end plugs is provided on a frame on one side of the electrode blank. The outlet of the vibratory feeder is connected to an arrangement track, and a robotic arm is installed at the outlet of the arrangement track. The robotic arm transfers the calcination into the electrode blank.

3. The pressure resistance welding apparatus according to claim 1, characterized in that: The bottom of the electrode contact plate extends downward into the frame. The frame surface below the linear guide rail is machined with a clearance groove to avoid the electrode contact plate. The linear guide rail is provided with a corrugated cover that wraps around the clearance groove.

4. The pressure resistance welding apparatus according to claim 1, characterized in that: The rubber clamp is conical, with its large-diameter end installed in the welding channel and its small-diameter end connected to the clamping piston.

5. The pressure resistance welding apparatus according to claim 1, characterized in that: The first feeding mechanism has the same structure as the second feeding mechanism, including two guide wheels and a linear servo track installed between the guide wheels. The guide wheels are rotatably mounted on the frame via brackets, and a gripper cylinder for clamping fuel rods is installed on the linear servo track.

6. The pressure resistance welding apparatus according to claim 5, characterized in that: The detection device includes a rotator, a limiting cylinder, and a camera. The rotator is installed on the outer side of one end of the second feeding mechanism. The rotator has a through hole for the fuel rod to pass through, and a clamping sleeve is provided in the through hole to hold the fuel rod. The limiting cylinder is installed on the side of the rotator away from the second feeding mechanism. A stop block aligned with the end plug is installed on the telescopic shaft of the limiting cylinder. The camera is vertically installed on the frame near the rotator via a support frame, and the camera is aligned with the welded joint of the end plug and the fuel rod.

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