CN111351708B - Device and method for detecting welding tension of annular fuel assembly buffer tube - Google Patents
Device and method for detecting welding tension of annular fuel assembly buffer tube Download PDFInfo
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- CN111351708B CN111351708B CN201811559915.0A CN201811559915A CN111351708B CN 111351708 B CN111351708 B CN 111351708B CN 201811559915 A CN201811559915 A CN 201811559915A CN 111351708 B CN111351708 B CN 111351708B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to a device and a method for detecting the welding and stretching of a buffer tube of an annular fuel assembly, wherein the device comprises a threaded joint and an olive head; the method comprises the following steps: step one, screwing one end of a buffer tube into a threaded joint of M7 x 0.5-6H for clamping a testing machine, and putting the other end of the buffer tube into a olive head of phi 13.65-0.05 for supporting; step two, mounting the pipe end filled with the olive head in an upper chuck of the testing machine, and then clamping; then moving the lower chuck to reach the proper position of the clamping end of the threaded joint, and clamping the lower end of the test piece; and step three, starting tensile detection until the buffer tube sample is broken. The invention designs and manufactures a special tool for welding, stretching and detecting the annular fuel assembly buffer tube. Thereby realizing the welding tension of the annular fuel assembly buffer tube and the static load tension detection at room temperature.
Description
Technical Field
The invention belongs to the field of buffer tube welding stretching detection, and particularly relates to a device and a method for detecting the welding stretching of a buffer tube of an annular fuel assembly.
Background
The tensile test under static load is one of the most widely used metal mechanical property test methods in industry, and the test is generally carried out in the room temperature (10-35) DEG C range. The test usually adopts a standard smooth cylindrical sample, and the test is characterized in that a plurality of important mechanical property indexes of elasticity, strength, plasticity, strain hardening and the like of the material are measured under determined test conditions (temperature, stress state, loading rate and environment), and three common failure modes of the material under static load, namely excessive elastic deformation, plastic deformation and fracture, are disclosed. The maximum force the test specimen can resist after the yield stage. For metallic materials with no apparent yield (continuous yield), the maximum force during the test.
The welding tension of the annular fuel assembly buffer tube is to test the quality of a welding seam by using a tensile test method. The maximum tensile strength of the sample is determined by stretching the sample on a tester, typically to break. The clamping part is used for being arranged in a clamp of a testing machine so as to clamp a sample, and the uniform stress of the transitional gauge length part needs to be ensured. The dimensions and requirements of these two parts are determined by the design effect of the weld tension detection device. This is also a difficulty of this invention.
As shown in figure 1, the buffer tube welding tensile sample is tubular, made of Zr-4 alloy, the whole length is 100-150mm, the outer diameter of the buffer tube is phi 14.8mm, the inner diameter of the buffer tube is phi 13.7, an end plug is welded at one end of the buffer tube, and the center of the end plug is M7 x 0.5-6H internal threads. The other end is in a pipe orifice shape of phi 13.7 +/-0.05.
Disclosure of Invention
The invention aims to: the two ends of the welded tensile sample of the annular fuel assembly buffer tube are special in structure and cannot be directly clamped on a clamp of an electronic universal testing machine. The invention aims to design and manufacture a special tool for welding and stretching detection of the annular fuel assembly buffer tube. Therefore, the establishment of the welding tension room-temperature static load tension test method of the annular fuel assembly buffer tube is realized.
The technical scheme of the invention is as follows: the device for detecting the welding and stretching of the annular fuel assembly buffer tube comprises a threaded joint and a olive head;
the threaded joint is cylindrical as a whole and has the length of 70-90mm; the right end is an external thread end, the length of the external thread end is 17-20mm, the thread size is M7 x 0.5-6H, and the external thread end is used for fixedly connecting a buffer tube; the left end is a clamping end, the length is 50-70mm, and the clamping end is used for clamping a testing machine; the connecting part between the clamping end and the external thread end is a slope transition area A, the diameter of the transition area A is gradually increased from phi 7mm of the external thread end to phi 9mm of the clamping end A, and the length of the transition area is 5-8mm;
the whole olive head is cylindrical, and the length of the olive head is 55-70mm; the right end is a clamping end B, the length of the clamping end B is 5-8mm, the diameter of the clamping end B is phi 14.2, and the clamping end B is used for clamping a testing machine; the left end is an insertion end, the length is 50-55mm, the outer diameter is phi 13.65mm-0.05, and the left end is used for extending into a sample to be filled; the middle part of the clamping end B and the insertion end is a transition area B which is provided with a reducing step, and the outer diameter is reduced from phi 14.2mm to phi 13.65mm-0.05.
Furthermore, the material of the threaded joint is 1Cr17Ni2 martensite.
Furthermore, the threaded joint is integrally subjected to quenching and tempering treatment, so that the tensile strength of the stretching tool is not lower than 30000N.
Furthermore, the olive head is made of 1Cr17Ni2 martensite.
Furthermore, the whole olive head is subjected to quenching and tempering treatment, and the tensile strength of the stretching tool is not lower than 30000N.
Furthermore, the end part of the external thread end is chamfered by 0.5.
Furthermore, the top end of the olive head is processed by a round angle R2.
The invention discloses a method for detecting the welding and stretching of a buffer tube of an annular fuel assembly, which uses the device of the invention and comprises the following steps:
step one, screwing one end of a buffer tube into a threaded joint of M7 x 0.5-6H for clamping a testing machine, and putting the other end of the buffer tube into a olive head of phi 13.65-0.05 for supporting;
step two, the pipe end filled with the olive head is installed in an upper chuck of the testing machine and then clamped; then moving the lower chuck to reach the proper position of the clamping end of the threaded joint, and clamping the lower end of the test piece;
and step three, starting tensile detection until the buffer tube sample is broken.
The invention has the following remarkable effects: by the method, the following effects are achieved in the welding and stretching detection project of the buffer tube of the static load annular fuel assembly at room temperature:
1) One end of the threaded joint is provided with M7X 0.5-6H threads and is connected with the end plug, the other end of the threaded joint is thickened to facilitate clamping, and the special tool can reach the tensile strength of more than 30000N through quenching and tempering treatment;
2) The olive head plugging end is matched with the inner diameter of the pipe, and the tail end is thickened for positioning, so that the olive head plugging end can be prevented from falling into the buffer pipe, and the olive head plugging end is convenient to take out of the buffer pipe after a test;
3) The special tool for welding and stretching detection of the annular fuel assembly buffer tube is designed and manufactured. Therefore, static load tensile detection of the annular fuel assembly buffer tube at room temperature under welding tension is realized.
Drawings
FIG. 1 is a schematic diagram of a ring-shaped fuel assembly buffer tube welded tensile specimen configuration;
FIG. 2 is a schematic view of a threaded joint configuration;
FIG. 3 is a schematic view of a olive head structure;
FIG. 4 is a schematic view of a method for weld-stretching detection of a buffer tube of a ring fuel assembly according to the present invention;
in the figure: 1. the plug comprises a circular hole clamping end, a 2-end plug thread clamping end, a 3-external thread, a 4-transition area, a 5-clamping end, a 6-clamping end, a 7-transition area and a 8-insertion end. .
Detailed Description
The following describes in detail an apparatus and method for detecting a weld elongation of a buffer tube of a ring fuel assembly according to the present invention with reference to the accompanying drawings and embodiments.
2-4, an apparatus for testing the weld elongation of a buffer tube of a ring fuel assembly comprises a threaded joint and a olive head;
the threaded joint is cylindrical as a whole and has the length of 70-90mm; the right end is an external thread end 3, the length is 17-20mm, the thread size is M7 x 0.5-6H, and the external thread end is used for fixedly connecting a buffer tube; the left end is a clamping end 5, the length is 50-70mm, and the clamping end is used for clamping a testing machine; the connecting part between the clamping end 5 and the external thread end 3 is a slope transition area A4, the diameter of the transition area A4 is gradually increased from phi 7mm of the external thread end 3 to phi 9mm of the clamping end A5, and the length of the transition area is 5-8mm;
the whole olive head is cylindrical, and the length of the olive head is 55-70mm; the right end is a clamping end B6, the length is 5-8mm, the diameter is phi 14.2, and the clamping end is used for clamping a testing machine; the left end is an insertion end 8, the length is 50-55mm, the outer diameter is phi 13.65mm-0.05, and the left end is used for extending into a sample to be filled; the middle part of the clamping end B6 and the inserting end 8 is a transition area B7 which is provided with a reducing step, and the outer diameter is reduced from phi 14.2mm to phi 13.65mm-0.05.
Furthermore, the material of the threaded joint is 1Cr17Ni2 martensite.
Furthermore, the threaded joint is integrally subjected to quenching and tempering treatment, so that the tensile strength of the stretching tool is not lower than 30000N.
Furthermore, the olive head is made of 1Cr17Ni2 martensite.
Furthermore, the whole olive head is subjected to quenching and tempering treatment, and the tensile strength of the stretching tool is not lower than 30000N.
Furthermore, the end of the male thread end 3 is chamfered by 0.5.
Furthermore, the top end of the insertion end 8 is processed by a round angle R2.
The invention discloses a method for detecting the welding and stretching of a buffer tube of an annular fuel assembly, which uses the device of the invention and comprises the following steps:
step one, screwing one end of a buffer tube into a threaded joint of M7 x 0.5-6H for clamping a testing machine, and putting the other end of the buffer tube into a olive head of phi 13.65-0.05 for supporting;
step two, mounting the pipe end filled with the olive head in an upper chuck of the testing machine, and then clamping; then moving the lower chuck to reach the proper position of the clamping end of the threaded joint, and clamping the lower end of the test piece;
and step three, starting tensile detection until the buffer tube sample is broken.
Claims (6)
1. The utility model provides a tensile device that detects of annular fuel assembly buffer tube welding which characterized in that: comprises a screwed joint and a olive head;
the threaded joint is cylindrical as a whole and has the length of 70-90mm; the right end is an external thread end (3), the length is 17-20mm, the thread size is M7 x 0.5-6H, and the external thread end is used for fixedly connecting a buffer tube; the left end is a clamping end A (5), the length is 50-70mm, and the clamping end A is used for clamping a testing machine; the connecting part between the clamping end A (5) and the external thread end (3) is a slope transition area A (4), the diameter of the transition area A (4) is gradually increased from phi 7mm of the external thread end (3) to phi 9mm of the clamping end A (5), and the length of the transition area is 5-8mm; the threaded joint is integrally quenched and tempered, and the tensile strength of the stretching tool is not lower than 30000N;
the whole olive head is cylindrical, and the length of the olive head is 55-70mm; the right end is a clamping end B (6), the length is 5-8mm, the diameter is phi 14.2, and the clamping end B is used for clamping a testing machine; the left end is an insertion end (8), the length is 50-55mm, the outer diameter is phi 13.65mm-0.05, and the insertion end is used for extending into a sample to be filled; the middle part of the clamping end B (6) and the inserting end (8) is a transition area B (7) which is provided with a reducing step, and the outer diameter is reduced from phi 14.2mm to phi 13.65mm-0.05; the olive head is integrally quenched and tempered, and the tensile strength of the stretching tool is not lower than 30000N.
2. The apparatus for testing the weld elongation of a buffer tube of a ring fuel assembly of claim 1, wherein: the threaded joint is made of 1Cr17Ni2 martensite.
3. The apparatus for testing the weld elongation of a buffer tube of a ring fuel assembly of claim 1, wherein: the olive head is made of 1Cr17Ni2 martensite.
4. The apparatus for the weld-draw test of a buffer tube of a ring fuel assembly of claim 1, wherein: the end part of the external thread end (3) is chamfered by 0.5.
5. The apparatus for the weld-draw test of a buffer tube of a ring fuel assembly of claim 1, wherein: the top end of the insertion end (8) is processed by a round angle R2.
6. A method of weld-draw testing of a buffer tube of an annular fuel assembly, using the apparatus of claim 1, comprising the steps of:
step one, screwing one end of a buffer tube into a threaded joint of M7 x 0.5-6H for clamping a testing machine, and putting the other end of the buffer tube into a olive head of phi 13.65-0.05 for supporting;
step two, mounting the pipe end filled with the olive head in an upper chuck of the testing machine, and then clamping; then moving the lower chuck to reach the proper position of the clamping end of the threaded joint, and clamping the lower end of the test piece;
and step three, starting tensile detection until the buffer tube sample is broken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811559915.0A CN111351708B (en) | 2018-12-20 | 2018-12-20 | Device and method for detecting welding tension of annular fuel assembly buffer tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811559915.0A CN111351708B (en) | 2018-12-20 | 2018-12-20 | Device and method for detecting welding tension of annular fuel assembly buffer tube |
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| CN111351708A CN111351708A (en) | 2020-06-30 |
| CN111351708B true CN111351708B (en) | 2022-12-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125250B (en) * | 2019-12-30 | 2023-02-21 | 中核北方核燃料元件有限公司 | Tensile detection device of fuel assembly sleeve pipe expanded joint |
| KR102347759B1 (en) * | 2020-07-14 | 2022-01-06 | 주식회사 선일다이파스 | Tensile test device and method of aluminum pipe |
| KR102478605B1 (en) * | 2021-12-30 | 2022-12-16 | 목포대학교산학협력단 | A test jig for primary barrier high strain tensile test |
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2018
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003254882A (en) * | 2002-03-04 | 2003-09-10 | Shotoku Corp | Test piece chuck |
| CN101209480A (en) * | 2006-12-30 | 2008-07-02 | 同方人工环境有限公司 | Method for manufacturing copper pipe bulged ring and tube gripper for implementing the method |
| JP2009294136A (en) * | 2008-06-06 | 2009-12-17 | Ihi Corp | Tension bending test method of tubular test specimen and device therefor |
| CN104198279A (en) * | 2014-09-16 | 2014-12-10 | 永兴特种不锈钢股份有限公司 | Standard sample connector for stretching |
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| CN111351708A (en) | 2020-06-30 |
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