CN111331213A - Brazing method for pipe seat under fuel assembly space curved surface structure - Google Patents
Brazing method for pipe seat under fuel assembly space curved surface structure Download PDFInfo
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- CN111331213A CN111331213A CN201811552947.8A CN201811552947A CN111331213A CN 111331213 A CN111331213 A CN 111331213A CN 201811552947 A CN201811552947 A CN 201811552947A CN 111331213 A CN111331213 A CN 111331213A
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- pipe seat
- brazing
- seat
- lower pipe
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- 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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
Abstract
The invention belongs to the technical field of fuel assembly welding, and particularly relates to a method for brazing a lower pipe seat of a fuel assembly spatial curved surface structure. The method comprises the following steps that space curved surface structure lower tube seat brazing is formed by two times of brazing, namely lower tube seat assembly brazing and lower tube seat part brazing respectively; the parts formed by assembling and brazing the lower pipe seat structural part, the upper ribs, the lower ribs and the blades are called lower pipe seat assembling parts, and the parts formed by assembling and brazing the lower pipe seat, the guide pipe seat and the instrument pipe seat are called lower pipe seat parts; the whole lower pipe base brazing method flow comprises the steps of assembling and spot welding a lower pipe base assembly, and coating the lower pipe base assembly; step three, brazing the lower pipe seat assembly; step four, assembling and spot welding the lower pipe seat part; step five, coating the lower pipe seat part; step six, brazing the lower pipe seat part; the defects that a local flow passage is blocked, and the pipe seat is not fully brazed after brazing are overcome.
Description
Technical Field
The invention belongs to the technical field of fuel assembly welding, and particularly relates to a method for brazing a lower pipe seat of a fuel assembly spatial curved surface structure.
Background
The existing nuclear fuel assembly lower pipe seat mostly adopts a split structure form (shown in figure 1) combining a foreign matter prevention plate and a structural part, the 'Hualong I' fuel assembly lower pipe seat adopts a creative space curved surface structure form (shown in figure 2), the integrated design with a flow channel and a filtering function is manufactured by using a brazing technology, and foreign matter filtering is carried out by utilizing the geometric shape of the flow channel, so that fuel damage caused by foreign matter abrasion is reduced.
The integral brazing lower pipe seat of the fuel assembly which is researched by the French Ashi enamel group has been used, but the published reports show that the technology is not put into practical use and is applied to the lower pipe seat product of the fuel assembly. The brazing manufacturing technology of the pipe seat in the space curved surface structure is successfully applied to the production of a CF3 pilot assembly in 2013, and the test of entering a pile is carried out, so that the operation condition in the pile is good. The reactor type of the brazing technique applied to the manufacturing of the pipe seat in the domestic existing pressurized water reactor manufacturing belongs to the first research and application in China.
The spatial curved surface lower tube seat is a cross reticular structural member and mainly comprises the following five parts: the welding fixture is assembled and brazed by the following 5 parts, namely 106 parts: lower tube socket structure (1), go up rib (15), rib (15) down, blade I (48), blade II (2), central instrument tube socket (1) and guide tube socket (24), the completion is brazed in the equipment.
In the brazing process of the pipe seat with the spatial curved surface structure, after brazing circulation, the defects that a local flow channel of the pipe seat is blocked and the pipe seat is not brazed and not fully brazed exist (as shown in figure 3), the defects cannot be solved through repeated circulation brazing repair welding, the brazing rate is low, and strict technical requirements are difficult to meet.
The lower pipe base has a large number of brazing seams, and technical documents have high requirements on the performance of the brazing seams, so that the yield is very low. Factors influencing the formation of the brazing seam and the performance of the brazing seam are many, and the study of the brazing process is particularly important.
And the gaps between the bulge of the blade bulge and the periphery of the lower pipe seat structural part are too small, so that a local flow passage of a brazing seam at the position is blocked.
The brazing seam between the blade and the lower pipe seat structural part is not brazed or fully brazed.
The brazing seam at the double-blade structure is not brazed, is not fully brazed and has local air holes.
The orifice burrs generated after the guide pipe seat hole and the instrument pipe seat hole are machined are formed, the blades are thin, a lot of harder turned edge burrs exist after machining, and the polishing space is small, so that the difficulty in manually removing the blades by a bench worker is high, the production efficiency is low, the blades are easy to be knocked and damaged, the blades deform, and the probability that the defects that the pipe seat is not brazed and the brazing is not fully welded is finally generated is increased.
Disclosure of Invention
The invention aims to provide a method for brazing a pipe seat under a fuel assembly space curved surface structure aiming at the defects in the prior art, and solves the problems that a local flow passage is blocked after the pipe seat is brazed, and the pipe seat is not brazed or fully brazed.
The technical scheme of the invention is as follows:
a method for brazing a lower pipe seat of a fuel assembly in a space curved surface structure comprises the following steps that brazing of the lower pipe seat of the space curved surface structure is required to be carried out twice, and brazing of a lower pipe seat assembly and brazing of a lower pipe seat component are respectively carried out;
the parts formed by assembling and brazing the lower pipe seat structural part, the upper ribs, the lower ribs and the blades are called lower pipe seat assembling parts, and the parts formed by assembling and brazing the lower pipe seat, the guide pipe seat and the instrument pipe seat are called lower pipe seat parts;
the whole lower pipe base brazing method flow comprises the steps of assembling and spot welding a lower pipe base assembly, and coating the lower pipe base assembly; step three, brazing the lower pipe seat assembly; step four, assembling and spot welding the lower pipe seat part; step five, coating the lower pipe seat part; step six, brazing the lower pipe seat part;
firstly, assembling and spot welding a lower pipe seat assembly;
assembling a lower pipe seat structural part, an upper rib, a lower rib and a blade into a lower pipe seat assembly part, and assembling, positioning and welding by using a lower pipe seat assembly spot welding clamp to ensure that a brazing seam gap is less than 0.10 mm;
the lower ribs are arranged in rib grooves of a structural part of the lower tube seat, and the lower ribs are lightly knocked down by a tool to be flush with the bottoms of the rib grooves;
the middle central blade is buckled and arranged in a corresponding middle blade groove of the lower pipe seat structural part, then the other blades are sequentially arranged, and the top of the blade is tapped by a tool to be tightly attached to the blade groove and the ribs;
the upper ribs are arranged in rib grooves of a structural part of the lower tube seat, and a tool is used for tapping the upper ribs to enable the upper ribs to be flush with the bottom of the lower rib grooves and the blades;
checking whether the mounting positions of the upper ribs, the lower ribs and the blades are correct or not, ensuring that the spherical convex direction of the blades is correct, and ensuring that the blades are mutually clamped with the ribs;
fixing the assembled lower pipe seat assembly by using a lower pipe seat assembly spot welding fixture;
and sequentially carrying out TIG fixed symmetrical spot welding on the joints of the upper ribs, the lower ribs and the lower pipe seat structural part.
Coating the lower pipe seat assembly;
performing back coating and front coating on the lower tube seat assembly part which is assembled, fixed and spot welded, and then brazing;
coating the back of the lower pipe seat assembly by adopting a linear end coating mode, wherein the back comprises a blade and lower rib intersection A, a blade and lower pipe seat structural member intersection B and a lower rib and lower pipe seat structural member intersection C;
the front surface of the lower pipe seat assembly is coated by adopting a linear end coating mode, and the front surface of the lower pipe seat assembly comprises a blade and upper rib intersection D, a blade and lower pipe seat structural member intersection E and an upper rib 2 and lower pipe seat structural member intersection F;
performing linear vertical coating on the intersection G of the blade and the lower pipe seat structural part on the side surface;
and performing linear vertical coating on the intersections H of the upper and lower ribs and the lower pipe seat structural part on the side surfaces.
If the brazing filler metal is coated on the non-brazing part, the brazing filler metal is wiped off;
and after all coating operations are finished, coating brazing flux on the periphery of the bottom of the lower tube seat structural part to prevent brazing flux from flowing to a non-brazing position.
Thirdly, brazing the lower pipe seat assembly;
and (3) loading the lower pipe seat assembly finished by the coating into a vacuum heat treatment furnace, vacuumizing the furnace to below 5 × 10-2Pa, starting to heat up, heating to 800 ℃ within 40-60 minutes, preserving the temperature for 10 minutes at 800 ℃, heating to 980-1040 ℃ within 20 minutes, preserving the temperature for 30-60 minutes, brazing, filling argon at a cooling rate of 650 ℃/hour, quickly cooling to 430 ℃, and cooling to below 140 ℃ in the furnace.
Fourthly, assembling and spot welding of the lower pipe seat part;
assembling a lower tube seat assembly, a guide tube seat and a central instrument tube seat into a lower tube seat part, and assembling, positioning and welding by adopting a lower tube seat guide tube seat spot welding fixture to ensure that the gap of a brazing seam is less than 0.10 mm;
after the upper guide pipe seat hole and the central instrument pipe seat hole of the lower pipe seat assembly are processed, the cleaned lower pipe seat assembly is placed into a lower pipe seat guide pipe seat spot welding clamp;
installing the guide tube seat and the instrument tube seat into the corresponding mounting holes of the lower tube seat assembly part, and tapping the guide tube seat and the instrument tube seat by a tool to enable the guide tube seat and the instrument tube seat to be flush with the bottom of the lower rib;
the clamp base body is put into an assembly fixture, and a jacking screw is adjusted to ensure the gaps among the guide pipe seat, the instrument pipe seat and the rib blade;
sequentially carrying out TIG fixed symmetrical spot welding on the connecting part of the guide tube seat and the upper rib and the connecting part of the instrument tube seat and the upper rib;
step five, coating the lower pipe seat part;
coating and brazing the assembled and fixed spot-welded lower pipe seat part;
on the back of the lower tube seat component, adopting an end part spot coating mode to sequentially perform end part spot coating on a joint J of the guide tube seat and the blade, a joint K of the guide tube seat and the lower rib, a joint L of the instrument tube seat and the blade and a joint M of the instrument tube seat and the lower rib;
turning over to the front side, and adopting an end point coating mode; sequentially carrying out end point coating on a crossing N of the guide pipe seat and the blade, a crossing P of the guide pipe seat and the lower rib, a crossing Q of the instrument pipe seat and the blade and a crossing R of the instrument pipe seat and the lower rib;
if the brazing filler metal is coated on the non-brazing part, the brazing filler metal should be wiped off.
Step six, brazing the lower pipe seat part;
and (3) putting the coated lower pipe seat part into a vacuum heat treatment furnace, vacuumizing the furnace to below 5 × 10-2Pa, starting to heat up, heating to 800 ℃ within 40-60 minutes, preserving the temperature for 10 minutes at 800 ℃, heating to 980-1040 ℃ within 20 minutes, preserving the temperature for 30-60 minutes, brazing, filling argon at a cooling rate of 650 ℃/hour, rapidly cooling to 430 ℃, and then cooling to below 140 ℃ in the furnace.
The invention has the beneficial effects that:
the lower pipe seat assembly and the lower pipe seat component assembled by the designed tool clamp are convenient to assemble and operate, the brazing seam is uniform in gap, the gap is controlled to be 0.05-0.10 mm, and the assembling efficiency and quality are improved.
The defects of partial flow passage blockage, no drilling and no full drilling of the lower pipe seat are successfully overcome, the primary drilling rate of the product reaches 99%, and the yield is improved from 30% to more than 80%.
The process is successfully applied to the manufacturing process of the lower pipe seat of the Hualong I fuel assembly, and is tested by irradiation and stacking.
Lays a solid technical foundation for the research and the industrialized application of the Hualongyi fuel assembly and the improvement of the economical efficiency and the competitiveness of products.
Drawings
FIG. 1 is a schematic view of the assembly of the lower socket assembly;
FIG. 2 is a schematic view of spot welding of the lower socket assembly;
FIG. 3 is a schematic view of a lower nozzle assembly backside coating;
FIG. 4 is a schematic front coating view of the lower socket assembly;
FIG. 5 is a schematic side view of a blade of the lower socket assembly and a structural member of the lower socket;
FIG. 6 is a schematic side view of the upper and lower ribs of the lower socket assembly and the lower socket structure;
FIG. 7 is a schematic view of assembly spot welding of a guide tube seat and an instrument tube seat of the lower tube seat part;
FIG. 8 is a schematic illustration of a back coating for a lower seat member;
FIG. 9 is a schematic front coating of the lower seat member.
In the figure: 1. a lower tube seat structure; 2. rib feeding; 3. arranging ribs; 4. a blade; 5. spherical convex; 6. a rib groove; 7. a blade groove; 8. a lower pipe seat structural member joint; 9. a crossing A; 10. a crossing B; 11. a crossing C; 12. a crossing D; 13. a crossing E; 14. a crossing F; 15. a crossing G; 16. a crossing H; 17. a lower socket assembly; 18. a guide tube seat; 19. a central instrument tube base; 20. a joint; 21. the joint of the upper rib; 22. a junction J; 23. a crossing K; 24. a crossing L; 25. a crossing M; 26. a crossing N; 27. a crossing P; 28. a crossing Q; 29. the intersection R.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
A method for brazing a lower pipe seat in a space curved surface structure of a fuel assembly is characterized in that the lower pipe seat in the space curved surface structure is brazed twice, and the brazing is respectively performed on a lower pipe seat assembly and a lower pipe seat component.
The lower pipe seat assembly is a part formed by assembling and brazing the lower pipe seat structural part, the upper ribs, the lower ribs and the blades. The lower tube base assembly, the guide tube base, and the instrument tube base assembly are brazed to form a part called a lower tube base member.
The whole lower pipe base brazing method flow comprises the following steps: assembling and spot-welding a lower pipe seat assembly, and coating the lower pipe seat assembly; step three, brazing the lower pipe seat assembly; step four, assembling and spot welding the lower pipe seat part; step five, coating the lower pipe seat part; and step six, brazing the lower pipe seat part.
Step one, assembling and spot welding a lower pipe seat assembly;
as shown in fig. 1, a lower tube seat assembly is assembled by a lower tube seat structural member 1, an upper rib 2, a lower rib 3 and a blade 4, and is assembled and positioned by a lower tube seat assembly spot welding fixture, so that the brazing seam gap is ensured to be less than 0.10 mm.
The lower ribs are arranged in the rib grooves 6 of the structural part of the lower tube seat, and the lower ribs are lightly knocked down by a tool to be flush with the bottoms of the rib grooves.
The central blade in the middle is buckled into the corresponding middle blade groove of the lower pipe seat structural part, then the other blades are sequentially arranged, and the top of the blade is tapped by a tool to be tightly attached to the blade groove 7 and the ribs.
The upper ribs are arranged in the rib grooves of the structural part of the lower tube seat, and the upper ribs are lightly tapped by a tool to be flush with the bottom of the lower rib grooves and the blades.
Whether the mounting positions of the upper rib, the lower rib and the blade are correct or not is checked, the direction of the spherical bulge 5 of the blade is ensured to be correct, and the blade and the ribs are ensured to be clamped with each other.
And fixing the assembled lower pipe seat assembly by using a lower pipe seat assembly spot welding clamp.
And sequentially carrying out TIG fixed symmetrical spot welding on the joints 8 of the upper ribs, the lower ribs and the lower pipe seat structural part, as shown in figure 2.
Step two, coating of the lower pipe seat assembly;
and (4) performing back coating and front coating on the lower pipe seat assembly part which is assembled, fixed and spot welded, and then performing brazing.
As shown in fig. 3, the back of the lower seat assembly is painted by applying paint to the straight end, including a crossing a9 between the blade 4 and the lower rib 3, a crossing B10 between the blade 4 and the lower seat structure 1, and a crossing C11 between the lower rib 3 and the lower seat structure 1.
And (3) turning over to the front, and coating the front of the lower base assembly by adopting a linear end coating manner as shown in fig. 4, wherein the coating manner comprises a position D12 where the blade 4 and the upper rib 2 intersect, a position E13 where the blade 4 and the lower base structural member 1 intersect, and a position F14 where the upper rib 2 and the lower base structural member 1 intersect.
As shown in fig. 5, the blade 4 is coated perpendicularly and linearly at the intersection G15 with the lower tube support structure 1.
As shown in fig. 6, the upper and lower beads are painted straight and perpendicular to the side surfaces H16 at the intersection with the lower seat structure 1.
If the brazing filler metal is coated on the non-brazing part, the brazing filler metal should be wiped off.
And after all coating operations are finished, coating brazing flux on the periphery of the bottom of the lower tube seat structural part to prevent brazing flux from flowing to a non-brazing position.
Step three, brazing the lower pipe seat assembly;
and (3) loading the lower pipe seat assembly with the finished coating into a vacuum heat treatment furnace, vacuumizing the furnace to below 5 × 10-2Pa, starting to heat up, heating to 800 ℃ within 40-60 minutes, keeping the temperature at 800 ℃ for 10 minutes, heating to 980-1040 ℃ within 20 minutes, keeping the temperature for 30-60 minutes, brazing, filling argon at a cooling rate of 650 ℃/hour, quickly cooling to 430 ℃, and taking out the pipe from the furnace after cooling to below 140 ℃.
Step four, assembling and spot welding the lower pipe seat part;
as shown in fig. 7, the lower tube base assembly 17, the guide tube base 18, and the center instrument tube base 19 are assembled into a lower tube base member, and the lower tube base member is assembled and tack-welded by using a lower tube base guide tube base spot welding jig, thereby ensuring that the brazing gap is less than 0.10 mm.
And (4) finishing processing an upper guide pipe seat hole and a central instrument pipe seat hole of the lower pipe seat assembly, and putting the cleaned lower pipe seat assembly into the lower pipe seat guide pipe seat spot welding fixture.
And (3) installing the guide tube seat and the instrument tube seat into the corresponding mounting holes of the lower tube seat assembly, and tapping the guide tube seat and the instrument tube seat by a tool to enable the guide tube seat and the instrument tube seat to be flush with the bottoms of the lower ribs.
And (4) putting the clamp base body into the assembly fixture, fixing, and adjusting a jacking screw to ensure the gaps among the guide pipe seat, the instrument pipe seat and the rib blade.
And sequentially carrying out TIG fixed symmetrical spot welding on a joint 20 of the guide tube seat 18 and the upper rib 2 and a joint 21 of the instrument tube seat and the upper rib.
Step five, coating the lower pipe seat part;
and (4) performing paint brazing on the lower pipe seat part which is assembled, fixed and spot welded.
As shown in fig. 8, on the back surface of the lower stem member, end pointing is performed in order on the intersection J22 of the guide stem 18 and the blade 4, the intersection K23 of the guide stem 18 and the lower rib 3, the intersection L24 of the meter stem 19 and the blade 4, and the intersection M25 of the meter stem 19 and the lower rib 3.
Turned to the front as shown in fig. 9, and end-point coated. The end parts of the intersection N26 of the guide pipe seat 18 and the blade 4, the intersection P27 of the guide pipe seat 18 and the lower rib 3, the intersection Q28 of the instrument pipe seat 19 and the blade 4 and the intersection R29 of the instrument pipe seat 19 and the lower rib 3 are point-painted in sequence.
If the brazing filler metal is coated on the non-brazing part, the brazing filler metal should be wiped off.
Step six, brazing the lower pipe seat part;
and (3) putting the coated lower pipe seat part into a vacuum heat treatment furnace, vacuumizing the furnace to below 5 × 10-2Pa, starting to heat up, firstly heating to 800 ℃ within 40-60 minutes, keeping the temperature at 800 ℃ for 10 minutes, then heating to 980-1040 ℃ within 20 minutes, keeping the temperature for 30-60 minutes, brazing, finally filling argon at a cooling rate of 650 ℃/hour, quickly cooling to 430 ℃, and then cooling to below 140 ℃ in the furnace.
Claims (7)
1. A method for brazing a lower pipe seat of a fuel assembly in a space curved surface structure comprises the following steps that brazing of the lower pipe seat of the space curved surface structure is required to be carried out twice, and brazing of a lower pipe seat assembly and brazing of a lower pipe seat component are respectively carried out;
the parts formed by assembling and brazing the lower pipe seat structural part, the upper ribs, the lower ribs and the blades are called lower pipe seat assembling parts, and the parts formed by assembling and brazing the lower pipe seat, the guide pipe seat and the instrument pipe seat are called lower pipe seat parts;
the method is characterized in that: the whole lower pipe base brazing method flow comprises the steps of assembling and spot welding a lower pipe base assembly, and coating the lower pipe base assembly; step three, brazing the lower pipe seat assembly; step four, assembling and spot welding the lower pipe seat part; step five, coating the lower pipe seat part; and step six, brazing the lower pipe seat part.
2. The method for brazing the pipe seat of the fuel assembly spatial curved structure according to claim 1, wherein: firstly, assembling and spot welding a lower pipe seat assembly;
assembling a lower pipe seat structural part, an upper rib, a lower rib and a blade into a lower pipe seat assembly part, and assembling, positioning and welding by using a lower pipe seat assembly spot welding clamp to ensure that a brazing seam gap is less than 0.10 mm;
the lower ribs are arranged in rib grooves of a structural part of the lower tube seat, and the lower ribs are lightly knocked down by a tool to be flush with the bottoms of the rib grooves;
the middle central blade is buckled and arranged in a corresponding middle blade groove of the lower pipe seat structural part, then the other blades are sequentially arranged, and the top of the blade is tapped by a tool to be tightly attached to the blade groove and the ribs;
the upper ribs are arranged in rib grooves of a structural part of the lower tube seat, and a tool is used for tapping the upper ribs to enable the upper ribs to be flush with the bottom of the lower rib grooves and the blades;
checking whether the mounting positions of the upper ribs, the lower ribs and the blades are correct or not, ensuring that the spherical convex direction of the blades is correct, and ensuring that the blades are mutually clamped with the ribs;
fixing the assembled lower pipe seat assembly by using a lower pipe seat assembly spot welding fixture;
and sequentially carrying out TIG fixed symmetrical spot welding on the joints of the upper ribs, the lower ribs and the lower pipe seat structural part.
3. The method for brazing the pipe seat of the fuel assembly spatial curved structure according to claim 1, wherein: coating the lower pipe seat assembly;
performing back coating and front coating on the lower tube seat assembly part which is assembled, fixed and spot welded, and then brazing;
coating the back of the lower pipe seat assembly by adopting a linear end coating mode, wherein the back comprises a blade and lower rib intersection A, a blade and lower pipe seat structural member intersection B and a lower rib and lower pipe seat structural member intersection C;
the front surface of the lower pipe seat assembly is coated by adopting a linear end coating mode, and the front surface of the lower pipe seat assembly comprises a blade and upper rib intersection D, a blade and lower pipe seat structural member intersection E and an upper rib 2 and lower pipe seat structural member intersection F;
performing linear vertical coating on the intersection G of the blade and the lower pipe seat structural part on the side surface;
and performing linear vertical coating on the intersections H of the upper and lower ribs and the lower pipe seat structural part on the side surfaces.
If the brazing filler metal is coated on the non-brazing part, the brazing filler metal is wiped off;
and after all coating operations are finished, coating brazing flux on the periphery of the bottom of the lower tube seat structural part to prevent brazing flux from flowing to a non-brazing position.
4. The method for brazing the pipe seat of the fuel assembly spatial curved structure according to claim 1, wherein: thirdly, brazing the lower pipe seat assembly;
and (3) loading the lower pipe seat assembly finished by the coating into a vacuum heat treatment furnace, vacuumizing the furnace to below 5 × 10-2Pa, starting to heat up, heating to 800 ℃ within 40-60 minutes, preserving the temperature for 10 minutes at 800 ℃, heating to 980-1040 ℃ within 20 minutes, preserving the temperature for 30-60 minutes, brazing, filling argon at a cooling rate of 650 ℃/hour, quickly cooling to 430 ℃, and cooling to below 140 ℃ in the furnace.
5. The method for brazing the pipe seat of the fuel assembly spatial curved structure according to claim 1, wherein: fourthly, assembling and spot welding of the lower pipe seat part;
assembling a lower tube seat assembly, a guide tube seat and a central instrument tube seat into a lower tube seat part, and assembling, positioning and welding by adopting a lower tube seat guide tube seat spot welding fixture to ensure that the gap of a brazing seam is less than 0.10 mm;
after the upper guide pipe seat hole and the central instrument pipe seat hole of the lower pipe seat assembly are processed, the cleaned lower pipe seat assembly is placed into a lower pipe seat guide pipe seat spot welding clamp;
installing the guide tube seat and the instrument tube seat into the corresponding mounting holes of the lower tube seat assembly part, and tapping the guide tube seat and the instrument tube seat by a tool to enable the guide tube seat and the instrument tube seat to be flush with the bottom of the lower rib;
the clamp base body is put into an assembly fixture, and a jacking screw is adjusted to ensure the gaps among the guide pipe seat, the instrument pipe seat and the rib blade;
and sequentially carrying out TIG fixed symmetrical spot welding on the connecting part of the guide tube seat and the upper rib and the connecting part of the instrument tube seat and the upper rib.
6. The method for brazing the pipe seat of the fuel assembly spatial curved structure according to claim 1, wherein: step five, coating the lower pipe seat part;
coating and brazing the assembled and fixed spot-welded lower pipe seat part;
on the back of the lower tube seat component, adopting an end part spot coating mode to sequentially perform end part spot coating on a joint J of the guide tube seat and the blade, a joint K of the guide tube seat and the lower rib, a joint L of the instrument tube seat and the blade and a joint M of the instrument tube seat and the lower rib;
turning over to the front side, and adopting an end point coating mode; sequentially carrying out end point coating on a crossing N of the guide pipe seat and the blade, a crossing P of the guide pipe seat and the lower rib, a crossing Q of the instrument pipe seat and the blade and a crossing R of the instrument pipe seat and the lower rib;
if the brazing filler metal is coated on the non-brazing part, the brazing filler metal should be wiped off.
7. The method for brazing the pipe seat of the fuel assembly spatial curved structure according to claim 1, wherein: step six, brazing the lower pipe seat part;
and (3) putting the coated lower pipe seat part into a vacuum heat treatment furnace, vacuumizing the furnace to below 5 × 10-2Pa, starting to heat up, heating to 800 ℃ within 40-60 minutes, preserving the temperature for 10 minutes at 800 ℃, heating to 980-1040 ℃ within 20 minutes, preserving the temperature for 30-60 minutes, brazing, filling argon at a cooling rate of 650 ℃/hour, rapidly cooling to 430 ℃, and then cooling to below 140 ℃ in the furnace.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113362976A (en) * | 2021-06-04 | 2021-09-07 | 中国核动力研究设计院 | Efficient filtering lower pipe seat, fuel assembly and nuclear reactor |
| CN114193095A (en) * | 2021-12-08 | 2022-03-18 | 中核建中核燃料元件有限公司 | Manufacturing method of nuclear fuel lower pipe seat adopting local 3D printing structure |
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|---|---|
| CN111331213B (en) | 2022-03-08 |
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