CN111318788A - Lower pipe seat and positioning pin welding method - Google Patents
Lower pipe seat and positioning pin welding method Download PDFInfo
- Publication number
- CN111318788A CN111318788A CN201811542859.XA CN201811542859A CN111318788A CN 111318788 A CN111318788 A CN 111318788A CN 201811542859 A CN201811542859 A CN 201811542859A CN 111318788 A CN111318788 A CN 111318788A
- Authority
- CN
- China
- Prior art keywords
- welding
- positioning pin
- lower pipe
- pipe seat
- diameter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The invention discloses a method for welding a lower pipe seat and a positioning pin, which can effectively reduce welding deformation and welding defects, improve welding quality and realize qualified one-time welding of products. The method comprises the following steps: the method comprises the following steps: prepressing and deforming; step two: welding; step three: the pre-denatured forms were removed. The invention has the beneficial effects that: by applying a reversible deformation method, a certain reversible deformation amount is applied to the lower pipe seat barrel in advance before the positioning pin is welded, so that the influence of welding deformation on the position degree of the positioning pin is offset, and the reliability of the positioning and mounting functions of the fuel assembly is ensured.
Description
Technical Field
The invention belongs to a welding method, and particularly relates to a method for welding a lower pipe seat and a positioning pin.
Background
The lower pipe seat component is one of key components of a TVS-2M high-fuel-consumption nuclear fuel assembly of a gulf nuclear power station, and has irreplaceable functions of positioning the core position of the fuel assembly, restraining a framework and supporting the weight of the assembly. The lower pipe seat component consists of 1 lower pipe seat, 6 rib plates, 1 connecting rod and a positioning pin, and all parts are connected through 31 welding seams. Due to the requirements of nuclear power plants for safe and intensive installation, the lower socket part must ensure very good coaxiality and positional accuracy after the welding is completed. In addition, in the welding process, the welding seam of the lower pipe seat and the positioning pin brings extra welding deformation and stress to the lower cylinder of the lower pipe seat, so that the situation that the circular outline near the lower pipe seat cylinder is changed into an irregular oval shape after welding is completed frequently occurs, and the lower pipe seat and the positioning pin are absolutely unqualified products in nuclear power products.
In the prior art, only careful welding can be performed, and then a qualified product with good quality is selected from finished products, so that time and labor are wasted, and a large amount of time and money are wasted.
Disclosure of Invention
The invention aims to provide a method for welding a lower tube seat and a positioning pin, which can effectively reduce welding deformation and welding defects, improve welding quality and realize one-time qualified welding of products.
The technical scheme of the invention is as follows: a lower pipe seat and positioning pin welding method comprises the following steps:
the method comprises the following steps: prepressing and deforming;
step two: welding;
step three: the pre-denatured forms were removed.
The first step comprises the steps of applying pre-pressing deformation to the lower pipe seat and the positioning pin, wherein the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated through the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, and D is the diameter of the cylinder body, and the unit is millimeter.
And K in the first step is 0.25%.
And K in the first step is 0.50%.
And the second step comprises the step of welding the circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 80A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, the diameter of a nozzle is 8 mm, and the width of the weld is 3 mm.
And the second step comprises the step of welding the circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 110A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, the diameter of a nozzle is 8 mm, and the width of the weld is 5 mm.
And step three, removing the pre-deformed shape by loosening the jacking screw after the welding is finished.
The invention has the beneficial effects that: by applying a reversible deformation method, a certain reversible deformation amount is applied to the lower pipe seat barrel in advance before the positioning pin is welded, so that the influence of welding deformation on the position degree of the positioning pin is offset, and the reliability of the positioning and mounting functions of the fuel assembly is ensured.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A lower pipe seat and positioning pin welding method comprises the following steps:
the method comprises the following steps: deformation by pre-pressing
Pre-pressing deformation is applied to the lower pipe seat and the positioning pin, the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated by the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, 0.25-0.50% is taken, D is the diameter of the cylinder body, and the unit is millimeter
Step two: welding of
And (3) welding the circumferential weld N3 by TIG (tungsten inert gas welding), wherein the current is 80-110A, the tungsten electrode is cerium tungsten and has the diameter of 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, and the diameter of a nozzle is 8 mm. The width of the welding seam is 3 mm-5 mm.
Step three: removing the pre-denatured shape
And after welding is finished, removing the pre-deformed shape by loosening the jacking screw.
The welding method for the lower pipe seat and the positioning pin comprises the step one, wherein the compression amount in the step one is 0.45-0.9 mm.
Example 1:
a lower pipe seat and positioning pin welding method comprises the following steps:
the method comprises the following steps: deformation by pre-pressing
Pre-pressing deformation is applied to the lower pipe seat and the positioning pin, the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated by the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, 0.5% is taken, D is the diameter of the cylinder body, the unit is millimeter, and the compression amount can also be taken as 0.45 millimeter.
Step two: welding of
And (3) welding a circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 80A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, and the diameter of a nozzle is 8 mm. The width of the weld seam is 3 mm.
Step three: removing the pre-denatured shape
And removing the pre-denatured shape after welding.
Example 2:
a lower pipe seat and positioning pin welding method comprises the following steps:
the method comprises the following steps: deformation by pre-pressing
Pre-pressing deformation is applied to the lower pipe seat and the positioning pin, the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated by the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, 0.8 percent is taken, D is the diameter of the cylinder body, and the unit is millimeter
The compression amount can also be 0.9 mm.
Step two: welding of
And (3) welding a circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 110A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, and the diameter of a nozzle is 8 mm. The width of the welding seam is 5 mm.
Step three: removing the pre-denatured shape
And removing the pre-denatured shape after welding.
Example 3:
a lower pipe seat and positioning pin welding method comprises the following steps:
the method comprises the following steps: deformation by pre-pressing
Pre-pressing deformation is applied to the lower pipe seat and the positioning pin, the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated by the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, 0.6 percent is taken, D is the diameter of the cylinder body, the unit is millimeter, and the compression amount can also be 0.6 millimeter.
Step two: welding of
And (3) welding a circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 65A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, and the diameter of a nozzle is 8 mm. The width of the weld seam is 4 mm.
Step three: removing the pre-denatured shape
And removing the pre-denatured shape after welding.
Example 4:
a lower pipe seat and positioning pin welding method comprises the following steps:
the method comprises the following steps: deformation by pre-pressing
Pre-pressing deformation is applied to the lower pipe seat and the positioning pin, the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated by the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, 0.4% is taken, D is the diameter of the cylinder body, the unit is millimeter, and the compression amount can also be taken as 0.7 millimeter.
Step two: welding of
And (3) welding a circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 91A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, and the diameter of a nozzle is 8 mm. The width of the weld seam is 4.5 mm.
Step three: removing the pre-denatured shape
And removing the pre-denatured shape after welding.
Claims (7)
1. A lower pipe seat and positioning pin welding method is characterized in that: the method comprises the following steps:
the method comprises the following steps: prepressing and deforming;
step two: welding;
step three: the pre-denatured forms were removed.
2. The method for welding the lower pipe seat and the positioning pin according to claim 1, wherein: the first step comprises the steps of applying pre-pressing deformation to the lower pipe seat and the positioning pin, wherein the applying direction is along the diameter direction of the lower pipe seat barrel, the compression object is the positioning pin, and the compression amount is calculated through the following formula
S＝KD
Wherein S is the compression amount, K is the coefficient, and D is the diameter of the cylinder body, and the unit is millimeter.
3. The method for welding the lower pipe seat and the positioning pin according to claim 2, wherein: and K in the first step is 0.25%.
4. The method for welding the lower pipe seat and the positioning pin according to claim 2, wherein: and K in the first step is 0.50%.
5. The method for welding the lower pipe seat and the positioning pin according to claim 1, wherein: and the second step comprises the step of welding the circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 80A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, the diameter of a nozzle is 8 mm, and the width of the weld is 3 mm.
6. The method for welding the lower pipe seat and the positioning pin according to claim 1, wherein: and the second step comprises the step of welding the circumferential weld N3, wherein TIG (tungsten inert gas) is adopted for welding, the current is 110A, the tungsten electrode is cerium tungsten, the diameter is 2.5 mm, the polarity of a power supply is direct current positive connection, the welding position is a horizontal position, the flow of protective gas is 7 liters per minute, the diameter of a nozzle is 8 mm, and the width of the weld is 5 mm.
7. The method for welding the lower pipe seat and the positioning pin according to claim 1, wherein: and step three, removing the pre-deformed shape by loosening the jacking screw after the welding is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542859.XA CN111318788A (en) | 2018-12-17 | 2018-12-17 | Lower pipe seat and positioning pin welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811542859.XA CN111318788A (en) | 2018-12-17 | 2018-12-17 | Lower pipe seat and positioning pin welding method |
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| Publication Number | Publication Date |
|---|---|
| CN111318788A true CN111318788A (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811542859.XA Pending CN111318788A (en) | 2018-12-17 | 2018-12-17 | Lower pipe seat and positioning pin welding method |
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| CN (1) | CN111318788A (en) |
Citations (7)
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| KR100547486B1 (en) * | 2003-07-11 | 2006-02-01 | 노윤근 | Apparatus for introducing counterdirectional transformed load operating to the upper structure of bridge in opposite direction to gravity direction and counterdirectional transformed load introduction method using the apparatus |
| CN101700608A (en) * | 2009-10-23 | 2010-05-05 | 武汉一冶钢结构有限责任公司 | Reversely deformed jig frame for welding U ribs of steel box girder |
| CN102319942A (en) * | 2011-09-05 | 2012-01-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Titanium alloy welded case installation edge pre-deformation welding and micro forming method |
| CN104084725A (en) * | 2014-07-02 | 2014-10-08 | 中广核工程有限公司 | Device and method for preventing welding deformation of pipelines in nuclear power plant |
| CN205393868U (en) * | 2015-12-31 | 2016-07-27 | 中核建中核燃料元件有限公司 | Barrel and otic placode welding jig |
| CN106312247A (en) * | 2016-10-19 | 2017-01-11 | 武船重型工程股份有限公司 | Bilateral welding method for fillet seams of U rib and orthotropic steel deck plate |
| CN106925868A (en) * | 2015-12-31 | 2017-07-07 | 中核建中核燃料元件有限公司 | A kind of cylinder and otic placode welding method |
-
2018
- 2018-12-17 CN CN201811542859.XA patent/CN111318788A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100547486B1 (en) * | 2003-07-11 | 2006-02-01 | 노윤근 | Apparatus for introducing counterdirectional transformed load operating to the upper structure of bridge in opposite direction to gravity direction and counterdirectional transformed load introduction method using the apparatus |
| CN101700608A (en) * | 2009-10-23 | 2010-05-05 | 武汉一冶钢结构有限责任公司 | Reversely deformed jig frame for welding U ribs of steel box girder |
| CN102319942A (en) * | 2011-09-05 | 2012-01-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Titanium alloy welded case installation edge pre-deformation welding and micro forming method |
| CN104084725A (en) * | 2014-07-02 | 2014-10-08 | 中广核工程有限公司 | Device and method for preventing welding deformation of pipelines in nuclear power plant |
| CN205393868U (en) * | 2015-12-31 | 2016-07-27 | 中核建中核燃料元件有限公司 | Barrel and otic placode welding jig |
| CN106925868A (en) * | 2015-12-31 | 2017-07-07 | 中核建中核燃料元件有限公司 | A kind of cylinder and otic placode welding method |
| CN106312247A (en) * | 2016-10-19 | 2017-01-11 | 武船重型工程股份有限公司 | Bilateral welding method for fillet seams of U rib and orthotropic steel deck plate |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200623 |
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| RJ01 | Rejection of invention patent application after publication |