CN112296577B - Welding tool for square tubes of spent fuel storage grillwork - Google Patents
Welding tool for square tubes of spent fuel storage grillwork Download PDFInfo
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- CN112296577B CN112296577B CN202011164315.1A CN202011164315A CN112296577B CN 112296577 B CN112296577 B CN 112296577B CN 202011164315 A CN202011164315 A CN 202011164315A CN 112296577 B CN112296577 B CN 112296577B
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- mandrel
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- square tube
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- fixing groove
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Abstract
The invention relates to the technical field of nuclear fuel storage equipment, in particular to a spent fuel storage grillwork square tube welding tool, which adopts the technical scheme that: comprises an outer clamping mechanism and an inner lining mechanism; the outer clamping mechanism comprises a clamping seat provided with a fixing groove, and a pressing plate is detachably connected with a notch of the fixing groove; the lining mechanism comprises a plurality of short base plates, a long base plate and a driving mandrel, wherein the short base plates and the long base plate are uniformly distributed along the circumferential direction of the driving mandrel; four driving assemblies are uniformly distributed on the circumference of the driving mandrel and are used for driving the base plate to move along the radial direction of the driving mandrel. The invention can realize the dimensional accuracy control and the welding process deformation control of the welded square tube, solves the technical problems of difficult control of the positioning accuracy and the welding deformation in the manufacturing process of the thin-wall slender square tube, and can ensure the manufacturing accuracy of the square tube.
Description
Technical Field
The invention relates to the technical field of nuclear fuel storage equipment, in particular to a welding tool for a square tube of a spent fuel storage grillwork.
Background
The spent fuel storage grillwork is an important safety device necessary for nuclear power, is mainly used for temporarily placing or storing irradiated and radioactive nuclear fuel assemblies discharged from a reactor for a long time, and plays an important role in ensuring safe operation of the nuclear power. The conventional spent fuel storage grillwork mainly comprises storage units, surrounding plates, connecting plates, a bottom plate, a base and the like. The storage unit consists of a square tube, a neutron absorption plate and a cladding, wherein the neutron absorption plate is fixed on the outer wall of the square tube by the cladding and is connected with the square tube in a segmented welding mode. The square tube is formed by bending stainless steel plates with the thickness of about 2-5mm and the length of 4000mm, and the connecting parts are welded together through a welding process.
The inside of the square tube is directly used for storing the spent fuel assembly, the overall dimension precision of the spent fuel is high, the requirements on the overall inner cavity and the straightness of the square tube are correspondingly high, and the straightness of the square tube on the overall length is less than or equal to 1 mm. Meanwhile, the square tube is relatively long, the wall thickness is thin, and the control of the whole size is very difficult, so that a special square tube assembling and welding tool needs to be developed to control the manufacturing precision of the square tube.
Disclosure of Invention
Aiming at the technical problem that the manufacturing precision of the conventional pan-fuel storage grid square tube is difficult to control, the invention provides a welding tool for a spent fuel storage grid square tube, which aims to solve the technical problem that the positioning precision and the welding deformation are difficult to control in the manufacturing process of a thin-wall slender square tube and ensure the manufacturing precision of the square tube.
The invention is realized by the following technical scheme:
a spent fuel storage grillage square tube welding tool comprises an outer clamping mechanism and an inner lining mechanism; the outer clamping mechanism comprises a clamping seat provided with a fixing groove, a pressing plate is detachably connected to a notch of the fixing groove, and a cavity defined by the fixing groove and the pressing plate is used for accommodating the square tube; the lining mechanism comprises three short backing plates, a long backing plate and a driving mandrel, wherein the short backing plates and the long backing plate are uniformly distributed along the circumferential direction of the driving mandrel, the long backing plate drives the driving mandrel to extend along the length direction of the mandrel, and the short backing plates are provided with a plurality of blocks along the length direction of the driving mandrel; four driving components are uniformly distributed on the circumference of the driving mandrel and used for driving the base plate to move along the radial direction of the driving mandrel.
When the square tube welding device is used, the long base plate and the short base plate are retracted through the driving assembly, the lining mechanism is inserted into the inner space of the bent square tube, then the square tube is placed into the fixing groove and is pressed tightly by the pressing plate, and the overall dimension of the square tube is constrained through the side walls of the fixing groove and the lower end face of the pressing plate, so that the constraint of the overall dimension of the square tube and the deformation control of the welding process are realized. After the pressing plate is pressed tightly, the short base plate and the long base plate are driven by the driving assembly to extrude the inner side wall of the square pipe, so that the square pipe is extruded to the side wall of the fixing groove through the short base plate, the welding seam surface of the square pipe is extruded to the lower end face of the pressing plate through the long base plate, and size tensioning restraint and welding process deformation control of the inner cavity of the square pipe are achieved. Therefore, the invention can realize the dimensional accuracy control and the welding process deformation control of the welded square tube, solves the technical problems of difficult control of the positioning accuracy and the welding deformation in the manufacturing process of the thin-wall slender square tube, and can ensure the manufacturing accuracy of the square tube.
Preferably, be equipped with the push pedal in the fixed slot, the distance of push pedal to a fixed slot lateral wall is variable, can weld the square pipe of different specifications on the one hand, and on the other hand can ensure that the side wall of square pipe can be pushed and put in place, ensures the size precision of square pipe.
Particularly, the grip slipper includes bottom plate and two bounding walls, bottom plate and bounding wall enclose the fixed slot, for integrated into one piece's grip slipper, enclose the fixed slot through bottom plate and bounding wall, can ensure the dimensional accuracy and the shape precision of fixed slot and reduce the processing degree of difficulty of fixed slot, further ensure the welding size precision of square pipe.
Preferably, the base plate and the enclosure are detachably connected to facilitate replacement and maintenance of the enclosure.
Particularly, the two pressing plates are symmetrically arranged along the length direction of the fixing groove, and a welding channel is reserved between the two pressing plates so as to facilitate the welding operation of the square pipe.
Specifically, the lining mechanism comprises an end supporting assembly, two middle supporting assemblies and a tail supporting assembly; the tip supporting component includes the front end dabber, middle part supporting component includes the middle part dabber, afterbody supporting component includes the afterbody dabber, front end dabber, middle part dabber and afterbody dabber set up in order to constitute the drive dabber with one heart. Because the square tube is long, if the mandrel which is integrally formed is used, the cylindricity of the driving mandrel cannot be ensured during processing, so that the driving mandrel is divided into four sections, the processing difficulty of the driving mandrel can be reduced, the cylindricity of the driving mandrel is ensured, and the straightness of the square tube is ensured.
Particularly, the end supporting assembly and the middle supporting assembly and the tail supporting assembly are fixedly connected through connecting flanges, and the connecting flanges are positioned through connecting pins so as to ensure the straightness of the lining mechanism through the connecting pins.
Specifically, mandrel positioning pins are arranged between the front end mandrel and the middle mandrel and between the middle mandrel and the tail mandrel, so that the straightness of the driving mandrel is ensured.
Preferably, the upper end of the long backing plate is provided with a vent groove, and a vent pipe is arranged in the vent groove so as to conveniently introduce shielding gas when the square pipe is welded.
Specifically, the driving assembly comprises a push-pull shaft, a top block and a return spring, and the return spring is used for driving the push-pull shaft to return; the ejector block is fixed on the side wall of the driving mandrel, and one end, supporting the push-pull shaft, of the ejector block is provided with a driving inclined surface or a cambered surface so as to drive the push-pull shaft to move in the radial direction of the driving mandrel through rotation of the driving mandrel, and therefore the base plate is driven to move in the radial direction of the driving mandrel. According to the invention, the ejector block is driven by the driving mandrel, the push-pull shaft is pushed by the ejector block, and then the liner plate is driven to support the inner side wall of the square tube, so that the stroke and the position of the liner plate can be accurately controlled, the external dimension and the shape tolerance of the square tube can be accurately controlled, the high-precision processing of the square tube is realized, and the requirement on the precision of the square tube of the spent fuel storage grid frame is further met.
The invention has the following advantages and beneficial effects:
1. according to the invention, the overall dimension of the square tube is constrained through the side walls of the fixed groove and the lower end surface of the pressing plate, so that the constraint of the overall dimension of the square tube and the deformation control of the welding process are realized, meanwhile, the square tube is extruded to the side walls of the fixed groove through the short backing plate, and the welding seam surface of the square tube is extruded to the lower end surface of the pressing plate through the long backing plate, so that the dimension tensioning constraint of the inner cavity of the square tube and the deformation control of the welding process are realized, the dimension precision control and the deformation control of the welding process of the welded square tube can be realized, the technical problems that the positioning precision and the welding deformation are difficult to control in the manufacturing process of the thin-wall slender square tube are solved, and the manufacturing precision of the square tube can be ensured;
2. according to the invention, the fixing groove is formed by enclosing the bottom plate and the enclosing plate, so that the size precision and the shape precision of the fixing groove can be ensured, the processing difficulty of the fixing groove is reduced, and the welding size precision of the square pipe is further ensured;
3. the driving mandrel is divided into four sections, so that the processing difficulty of the driving mandrel can be reduced, the cylindricity of the driving mandrel is ensured, and the straightness of a square tube is ensured;
4. according to the invention, the ejector block is driven by the driving mandrel, the push-pull shaft is pushed by the ejector block, and then the liner plate is driven to support the inner side wall of the square tube, so that the stroke and the position of the liner plate can be accurately controlled, the external dimension and the shape tolerance of the square tube can be accurately controlled, the high-precision processing of the square tube is realized, and the requirement on the precision of the square tube of the spent fuel storage grid frame is further met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of an external clamping mechanism of the present invention;
FIG. 2 is a schematic view of the lining mechanism of the present invention;
FIG. 3 is a schematic view of the plane A-A of FIG. 2;
FIG. 4 is an enlarged view of the portion C of FIG. 3;
fig. 5 is an enlarged schematic view of a portion B of fig. 2.
Names of various parts in the drawings:
1-bottom plate, 2-push plate, 3-press plate adjusting screw, 4-press plate, 5-cushion block, 6-coaming, 7-tightening screw, 8-coaming fixing screw, 9-end positioning flange, 10-end supporting component, 11-connecting flange, 12-middle supporting component, 13-connecting pin, 14-bearing, 15-mandrel positioning pin, 16-tail mandrel, 17-washer, 18-tail fixing screw, 19-tail positioning plate, 20-tail supporting component, 21-positioning connecting ring, 22-connecting screw, 23-middle mandrel, 24-middle connecting screw, 25-front mandrel, 26-end screw, 27-short backing plate, 28-top block, 29-locking nut, 30-sleeve fixing screw, 31-sleeve, 32-return spring, 33-backing plate fixing screw, 34-vent pipe, 35-push-pull shaft, 36-top block fixing screw, 37-long backing plate and 38-square pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
A spent fuel storage grillwork square tube 38 welding tool comprises an outer clamping mechanism and an inner lining mechanism; the outer clamping mechanism comprises a clamping seat provided with a fixing groove, a pressing plate 4 is detachably connected to a notch of the fixing groove, and a cavity defined by the fixing groove and the pressing plate 4 is used for accommodating the square pipe 38; the lining mechanism comprises three short backing plates 27, a long backing plate 37 and a driving mandrel, wherein the short backing plates 27 and the long backing plate 37 are uniformly distributed along the circumferential direction of the driving mandrel, the long backing plate 37 is driven to extend along the length direction of the mandrel, and the short backing plates 27 are provided with a plurality of blocks along the length direction of the driving mandrel; four driving components are uniformly distributed on the circumference of the driving mandrel and used for driving the base plate to move along the radial direction of the driving mandrel.
Specifically, referring to fig. 1, the holder includes a bottom plate 1 and two enclosing plates 6, and the bottom plate 1 and the enclosing plates 6 enclose a fixing groove. Preferably, the base plate 1 and the enclosure 6 are removably attached to facilitate replacement and maintenance of the enclosure 6. That is to say, two bounding wall 6 lower extreme branch are located the both sides of bottom plate 1 to through a plurality of bounding wall set screw 8 fixed connection, for integrated into one piece's grip slipper, enclose into the fixed slot through bottom plate 1 and bounding wall 6, can ensure the size precision and the shape precision of fixed slot and reduce the processing degree of difficulty of fixed slot, further ensure the welding size precision of square pipe 38.
In addition, two pressing plates 4 are symmetrically arranged in the length direction of the fixing groove, and a welding channel is reserved between the two pressing plates 4, so that the welding operation of the square pipe 38 is facilitated. It can be understood that one side of the pressure plate 4 is fixedly connected with the upper end of the coaming 6 through a plurality of pressure plate adjusting screws 3. In order to ensure that the pressing plates 4 can press parts on two sides of the welding seam of the square pipe 38, the lower ends of the opposite sides of the two pressing plates 4 are fixed with cushion blocks 5.
Preferably, be equipped with push pedal 2 in the fixed slot, push pedal 2 is variable to the distance of a fixed slot lateral wall, can weld the square pipe 38 of different specifications on the one hand, and on the other hand can ensure that the side wall of square pipe 38 can be extruded and put in place, ensures the dimensional accuracy of square pipe 38. Based on fig. 1, the push plate 2 is arranged in parallel with the enclosing plates 6, wherein one of the enclosing plates 6 is provided with a plurality of tightening screws 7, so that the distance between the push plate 2 and the enclosing plate 6 can be adjusted through the tightening screws 7.
Wherein, the lining mechanism comprises an end supporting component 10, two middle supporting components 12 and a tail supporting component 20; the end supporting component 10 comprises a front end mandrel 25, the middle supporting component 12 comprises a middle mandrel 23, the tail supporting component 20 comprises a tail mandrel 16, and the front end mandrel 25, the middle mandrel 23 and the tail mandrel 16 are concentrically arranged to form a driving mandrel. Because the square tube 38 is long, if an integrally formed mandrel is used, the cylindricity of the driving mandrel cannot be ensured during processing, so that the driving mandrel is divided into four sections, the processing difficulty of the driving mandrel can be reduced, the cylindricity of the driving mandrel is ensured, and the straightness of the square tube 38 is ensured.
Specifically, the end support assembly 10 and the middle support assembly 12 and the tail support assembly 20 are fixedly connected through a connecting flange 11, and the connecting flange 11 is positioned through a connecting pin 13 so as to ensure the linearity of the lining mechanism through the connecting pin 13.
Specifically, the spindle positioning pins 15 are provided between the front spindle and the middle spindle 23 and between the middle spindle 23 and the tail spindle 16, so as to ensure the linearity of the driving spindles.
In particular with reference to fig. 2 and 5, the lining mechanism comprises an end support assembly 10, a tail support assembly 20 and two mid-support assemblies 12; one end of the end supporting component 10 is connected with the end positioning flange 9 through an end screw 26, and the other end is connected and fastened with the connecting flange 11 through a connecting screw 22; one end of the tail supporting component 20 is connected with the tail positioning 19 through a tail fixing screw 18, and the other end is connected and fastened with the connecting flange 11 through a connecting screw 22; the two middle support assemblies 12 are respectively connected and fastened with the connecting flanges 11 through connecting screws 22, and each two connecting flanges 11 are connected in a positioning mode through connecting pins 13. The driving mandrel comprises a front end mandrel 25, a tail mandrel 16 and two middle mandrels 23, two ends of the four mandrels are respectively arranged on the bearings 14, the mandrels are connected through mandrel positioning pins 15, and every two bearings 14 are connected through positioning connecting rings 21.
Preferably, a vent groove is formed at the upper end of the long backing plate 37, and a vent pipe 34 is arranged in the vent groove so as to facilitate the introduction of shielding gas when the square pipe 38 is welded.
Specifically, the driving assembly comprises a push-pull shaft 35, a top block 28 and a return spring 32, wherein the return spring 32 is used for driving the push-pull shaft 35 to return; the top block 28 is fixed on the side wall of the driving mandrel, and one end of the top block 28 supporting the push-pull shaft 35 is provided with a driving inclined surface or an arc surface, so that the push-pull shaft 35 is driven to move in the radial direction of the driving mandrel through the rotation of the driving mandrel, and the backing plate is driven to move in the radial direction of the driving mandrel. According to the invention, the ejector block 28 is driven by the driving mandrel, and the push-pull shaft 35 is pushed by the ejector block 28, so that the inner side wall of the square tube 38 supported by the base plate is driven, the stroke and the position of the base plate can be accurately controlled, the external dimension and the shape tolerance of the square tube 38 are accurately controlled, the high-precision processing of the square tube 38 is realized, and the requirement on the precision of the spent fuel storage grid square tube 38 is met.
As further shown in fig. 3 and 4, the driving mandrel is disposed in a square sleeve having a through hole for the sleeve 31 to pass through; the ejector block 28 is connected with the driving mandrel through an ejector block fixing screw 36, and the ejector block 28 is in surface contact with the push-pull shaft 35; the sleeve 31 is fixedly connected with the sleeve through a sleeve fixing screw 30, and the return spring 32 is arranged in a cavity between the sleeve 31 and the push-pull shaft 35 and limits the line segment of the push-pull shaft 35 through the locking nut 29. And the short pad plate 27 and the long pad plate 37 are connected to the push-pull shaft 35 by pad plate fixing screws 33, respectively.
Description of the invention:
the long pad plate 37 and the short pad plate 27 are firstly retracted by the driving assembly, and the lining mechanism is inserted into the inner space of the bent square tube 38, that is, the square tube 38 is installed on the outer surfaces of the short pad plate 27 and the long pad plate 37 of the square tube lining mechanism.
Then, the square pipe 38 is placed in the fixing groove and is pressed by the pressing plate 4, the overall dimension of the square pipe 38 is constrained through each side wall of the fixing groove and the lower end face of the pressing plate 4, that is, the square pipe 38 is fixed in the fixing clamping seat, and therefore the constraint of the overall dimension of the square pipe 38 and the deformation control of the welding process are achieved.
Meanwhile, after the pressing plate 4 is pressed tightly, the front end mandrel 25 is rotated to drive the middle mandrel 23 and the tail mandrel 16 to rotate together, the top 28 is driven to rotate simultaneously, the top block 28 drives the push-pull shaft 35 to move radially, so that the short cushion plate 27 and the long cushion plate 37 are driven to extrude the inner side wall of the square pipe 38, the square pipe 38 is extruded to the side wall of the fixing groove through the short cushion plate 27, and the welding seam surface of the square pipe 38 is extruded to the lower end face of the pressing plate 4 through the long cushion plate 37. And the outer walls of the square push plate 2 and the cushion block 5 square tube realize the size tensioning restraint of the inner cavity of the square tube 38 and the deformation control in the welding process by adjusting the jacking screw 7 and the pressing plate adjusting screw 3.
Argon gas is introduced through a vent pipe 34 arranged on the square pipe lining mechanism, so that spot welding and welding of the square pipe can be carried out.
After the square pipe 38 is welded, the welded square pipe can be taken out by rotating the front-end rotating shaft 25, loosening the jacking screw 7 and the pressing plate adjusting screw 3.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A spent fuel storage grillwork square tube welding tool is characterized by comprising an outer clamping mechanism and an inner lining mechanism;
the outer clamping mechanism comprises a clamping seat provided with a fixing groove, a pressing plate (4) is detachably connected to a notch of the fixing groove, and a cavity defined by the fixing groove and the pressing plate (4) is used for accommodating the square pipe (38);
the lining mechanism comprises a plurality of short base plates (27), a long base plate (37) and a driving mandrel, wherein the short base plates (27) and the long base plate (37) are uniformly distributed along the circumferential direction of the driving mandrel, the long base plate (37) drives to extend along the length direction of the mandrel, and a plurality of groups of the short base plates (27) are arranged along the length direction of the driving mandrel;
four driving assemblies are uniformly distributed on the circumference of the driving mandrel, each driving assembly comprises a push-pull shaft (35), a top block (28) and a return spring (32), and the return springs (32) are used for driving the push-pull shafts (35) to return; the jacking block (28) is fixed on the side wall of the driving mandrel, one end, supporting the push-pull shaft (35), of the jacking block (28) is provided with a driving inclined surface or an arc surface, so that the push-pull shaft (35) is driven to move in the radial direction of the driving mandrel through rotation of the driving mandrel, the backing plate is driven to move in the radial direction of the driving mandrel, and the driving assembly is used for driving the backing plate to move in the radial direction of the driving mandrel;
the lining mechanism comprises an end supporting assembly (10), two middle supporting assemblies (12) and a tail supporting assembly (20); the end supporting assembly (10) comprises a front end mandrel (25), the middle supporting assembly (12) comprises a middle mandrel (23), the tail supporting assembly (20) comprises a tail mandrel (16), and the front end mandrel (25), the middle mandrel (23) and the tail mandrel (16) are concentrically arranged to form a driving mandrel;
the end supporting assembly (10) and the middle supporting assembly (12) and the tail supporting assembly (20) are fixedly connected through connecting flanges (11), and the connecting flanges (11) are positioned through connecting pins (13);
and mandrel positioning pins (15) are arranged between the front end mandrel (25) and the middle mandrel (23) and between the middle mandrel (23) and the tail mandrel (16).
2. The welding tooling for the square tube of the spent fuel storage lattice frame as claimed in claim 1, wherein a push plate (2) is arranged in the fixing groove, and the distance from the push plate (2) to one side wall of the fixing groove is variable.
3. The welding tooling for the square tubes of the spent fuel storage grillwork according to claim 1, wherein the clamping seat comprises a bottom plate (1) and two surrounding plates (6), and the bottom plate (1) and the surrounding plates (6) enclose a fixing groove.
4. The spent fuel storage grid square tube welding tool according to claim 3, wherein the bottom plate (1) and the coaming (6) are detachably connected.
5. The welding tooling for the square tube of the spent fuel storage lattice frame according to claim 1, wherein two pressure plates (4) are symmetrically arranged in the length direction of the fixing groove, and a welding channel is reserved between the two pressure plates (4).
6. The welding tooling for the square tubes of the spent fuel storage grillwork according to claim 1, wherein the upper end of the long backing plate (37) is provided with a vent groove, and a vent pipe (34) is arranged in the vent groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164315.1A CN112296577B (en) | 2020-10-27 | 2020-10-27 | Welding tool for square tubes of spent fuel storage grillwork |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164315.1A CN112296577B (en) | 2020-10-27 | 2020-10-27 | Welding tool for square tubes of spent fuel storage grillwork |
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| CN112296577A CN112296577A (en) | 2021-02-02 |
| CN112296577B true CN112296577B (en) | 2022-06-24 |
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| CN202011164315.1A Active CN112296577B (en) | 2020-10-27 | 2020-10-27 | Welding tool for square tubes of spent fuel storage grillwork |
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| CN113878273B (en) * | 2021-11-11 | 2023-05-16 | 航天科工哈尔滨风华有限公司 | Welding positioning tool for square tube framework lining threaded backboard and use method |
| CN113909664B (en) * | 2021-11-29 | 2023-03-10 | 东方电气（武汉）核设备有限公司 | Device and method for assembling and welding honeycomb-shaped porous heat exchange element |
| CN115091044B (en) * | 2022-08-26 | 2022-12-20 | 成都航天万欣科技有限公司 | Welding tool and welding method for aluminum alloy thin-wall box |
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