CN107470747A - Improve the welding procedure of steam generator plugging efficiency - Google Patents
Improve the welding procedure of steam generator plugging efficiency Download PDFInfo
- Publication number
- CN107470747A CN107470747A CN201710743687.1A CN201710743687A CN107470747A CN 107470747 A CN107470747 A CN 107470747A CN 201710743687 A CN201710743687 A CN 201710743687A CN 107470747 A CN107470747 A CN 107470747A
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- CN
- China
- Prior art keywords
- plug
- welding
- root face
- plugging
- welding head
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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.)
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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
- B23K9/235—Preliminary treatment
-
- 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
- B23K2101/14—Heat exchangers
Abstract
The present invention relates to it is a kind of improve steam generator plugging efficiency welding procedure, comprising：S1, to being machined out for the plug that plugging is welded, stretch out to form annular root face on the outer wall of plug；S2, mach plug will be completed on welding head, and the welding head for being provided with plug will be inserted into the heat exchanger tube for needing to carry out plugging operation, and the root face on plug is steadily contacted with tube sheet；S3, welding head is opened, annular is carried out to root face from melting welding so that plug is connected with Tube-sheet Welding, completes the plugging operation of exchange heat pipe.The present invention sets root face to change stopper structure by increasing on plug outer wall, using annular being welded to connect between plug and tube sheet is realized from melting welding, the efficiency of plugging operation is effectively improved, reduces the exposure time of maintenance personal, reduces health threat of the nuclear radiation to maintenance personal.
Description
Technical field
The present invention relates to a kind of welding procedure, in particular to a kind of welding that can effectively improve steam generator plugging efficiency
Technique, belong to the technical field of the in-service maintenance of steam generator.
Background technology
In the prior art, according to different reactor types, nuclear power station steam generator has thousands of or even tens of thousands of U-shaped
Heat exchanger tube, if it is therein certain revealed with U heat exchange if, the water for causing secondary circuit is contaminated, it is therefore desirable to repair
Personnel carry out plugging processing and operation in time to the heat exchanger tube revealed.But nuclear power station is in the process of running, as cooling
The heavy water of agent and moderator will produce substantial amounts of tritium, once leakage will cause great radiation threat to maintenance personal.
Generally, when being repaired to nuclear power generating equipment, especially when the heat exchanger tube to leakage carries out plugging operation, for drop
Low nuclear radiation, maintenance personal need to wear protection frog-suit.But when carrying out plugging operation to steam generator, due to low head
Working space is smaller, and the protection frog-suit that maintenance personal wears expansion will cause operation inconvenience so that and it is time-consuming longer, have a strong impact on dimension
Repair efficiency.
In addition, when nuclear power station operation carries out plugging welding, the technique that generally use adds an argon tungsten-arc welding is carried out to plug
Fillet welding, maintenance personal must both hands while operations of welding in the overhead position；And because the distance between U heat exchange is smaller, it will be further increased
The operation difficulty of plugging, while the quality of weld seam can not also be protected.Therefore, the stifled of heat exchanger tube how is quickly and efficiently completed
Pipe operation, the life safety of maintenance personal will be directly influenced.
Based on above-mentioned, the present invention proposes that a kind of can quickly block up welds heat exchanger tube and improve the welding procedure of weldquality, has
Effect reduces health threat of the nuclear radiation to maintenance personal.
The content of the invention
It is an object of the invention to provide a kind of welding procedure for improving steam generator plugging efficiency, by plug outer wall
Upper increase sets root face to change stopper structure, realizes being welded to connect between plug and tube sheet from melting welding using annular, effectively
The efficiency of plugging operation is improved, reduces the exposure time of maintenance personal, reduces health threat of the nuclear radiation to maintenance personal.
To achieve these goals, the present invention provides a kind of welding procedure for improving steam generator plugging efficiency, comprising
Following steps：
S1, to being machined out for the plug that plugging is welded, stretch out to form annular root face on the outer wall of plug；
S2, mach plug will be completed on welding head, and the welding head for being provided with plug will be inserted into
Need to carry out in the heat exchanger tube of plugging operation, the root face on plug is steadily contacted with tube sheet；
S3, welding head is opened, annular is carried out to root face from melting welding so that plug is connected with Tube-sheet Welding, completes exchange
The plugging operation of heat pipe.
In described S1, the section for being provided with the plug 1 of annular root face 2 is in " ten " font.
The internal diameter of heat exchanger tube of the external diameter of described plug with needing to carry out plugging operation matches.
In described S2, when plug is arranged on welding head, carried out by the way that root face is fastened on welding head
Positioning；And cause root face to keep certain distance with the tungsten electrode on welding head and be relatively fixed.
In described S2, when plug is arranged in heat exchanger tube by welding head insertion, the external diameter of the root face on plug
More than external diameter 2mm~10mm of heat exchanger tube.
In described S2, welding head uses Gas Tungsten Arc Welding head, 360 ° of ring rotations of arc pole can be achieved, with reality
Now to the annular from melting welding of root face.
In summary, the welding procedure provided by the present invention for improving steam generator plugging efficiency, it is certainly molten using root face
The welding method of change realizes being welded to connect between plug and tube sheet so that maintenance personal can be efficient by one-handed performance
The plugging operation of exchange heat pipe is completed, while ensureing that weldquality is stable, nuclear radiation is effectively reduced and maintenance personal is good for
Health threatens.
Brief description of the drawings
Fig. 1 is the structural representation of the heat exchange tube-plate of the steam generator in the present invention；
Fig. 2 is the structural representation of the plug for being used for plugging welding in the present invention；
Fig. 3 is the assembling schematic diagram of the welding procedure of the raising steam generator plugging efficiency in the present invention.
Embodiment
Below in conjunction with Fig. 1~Fig. 3, a preferred embodiment of the present invention is described in detail.
As shown in figure 3, for the welding procedure of raising steam generator plugging efficiency provided by the invention, following step is included
Suddenly：
S1, as shown in Fig. 2 being machined out to the plug 1 welded for plugging, stretch out on the outer wall of plug 1
Form a ring shape root face 2；
S2, mach plug 1 will be completed on welding head, and the welding head for being provided with plug 1 will be inserted
In to the heat exchanger tube 3 for needing to carry out plugging operation so that the root face 2 on plug 1 is steadily contacted with tube sheet 4, as shown in Figure 3；
S3, welding head is opened, annular is carried out to root face 2 from melting welding so that plug 1 is welded to connect with tube sheet 4, completion pair
The plugging operation of heat exchanger tube 3.
As shown in Fig. 2 in described S1, the section for being provided with the plug 1 of annular root face 2 is in " ten " font.
The internal diameter of heat exchanger tube 3 of the external diameter of described plug 1 with needing to carry out plugging operation matches.First in plugging
, it is necessary to which plug 1 is smoothly inserted in heat exchanger tube 3 in journey, therefore the external diameter of plug 1 needs the internal diameter less than heat exchanger tube 3；But it is
The good plugging effect of guarantee, between the external diameter and the internal diameter of heat exchanger tube 3 of plug 1 can not differ too big；Therefore, plug 1
External diameter and the internal diameter for needing to carry out the heat exchanger tube 3 of plugging operation match.
As shown in figure 1, in described S2, tube sheet 4 is welded with heat exchanger tube 3 after mechanical expansion or Hydraulic Expansion using sealing weldering
Connection.
In described S2, when plug 1 is arranged in heat exchanger tube 3 by welding head insertion, root face 2 on plug 1
External diameter is more than external diameter 2mm~10mm of heat exchanger tube 3.Because the spacing between adjacent heat exchange tubes in steam generator is smaller, therefore
Consider root face 2 external diameter can not set it is excessive, otherwise due to space limitation will influence welding implementation；In addition, again due to blunt
Side 2 is realizes from the part of melting welding, if the external diameter of root face 2 is too big, will increase the workload of welding, but if root face 2 is outer
Footpath is too small, then can not safe and reliable realization be welded to connect.Therefore, the factor of above-mentioned each side is taken into consideration, by plug 1
The external diameter of root face 2 is limited in more than in the range of the external diameter 2mm~10mm of heat exchanger tube 3, so as in protection from the same of melting welding reliability
When, it is not easy to influence the performance of plug 1 again.
But those skilled in the art should it is clear that steam generator for different model, adjacent heat exchange tubes it
Between spacing have corresponding adjustment, and the dimension of inner and outer diameters of each heat exchanger tube in itself would also vary from, for for example changing
Heat pipe spacing increase or heat exchanger tube external diameter increase etc. special circumstances when, for root face 2 external diameter limitation be also required to accordingly enter
Row change, q＆r from melting welding is ensured with this, while ensuring effective implementation from melting welding.Therefore, outside root face
Limitation of the footpath more than heat exchanger tube external diameter 2mm~10mm is more to enter one for stopper structure just for most normal conditions
The restriction of step, in actual application, when corresponding adjustment can be made according to field condition.
In the present embodiment, the external diameter of the root face 2 on plug 1 is more than the external diameter 2mm of heat exchanger tube 3, or 5mm, or 8mm, or
10mm。
In described S2, welding head uses Gas Tungsten Arc Welding head, 360 ° of ring rotations of arc pole can be achieved, with reality
Now to the annular from melting welding of root face 2.
It is smaller for spacing between adjacent heat exchange tubes in steam generator in the present embodiment, cause heat exchanger tube to weld space
Less limitation, and need to carry out the requirement of annular solder, therefore be considered as the suitable argon tungsten-arc welding of size and pick
Head carries out plugging welding operation.
It is enterprising by the way that root face 2 is fastened on into welding head when plug 1 is arranged on welding head in described S2
Row positioning；And cause root face 2 to keep certain distance with the tungsten electrode on welding head and be relatively fixed.In practical operation, tungsten
Pole need to adjust according to multiple engineer testing relative to the distance of root face 2 and fix.
In the present embodiment, described root face 2 is fastened on welding head by male-female engagement or buckle setting etc., so as to real
The now installation positioning to plug 1.But those skilled in the art should it is clear that any other can realize by root face 2 card set
The technical scheme of mechanical connection on welding head, is also applied for the present invention.
In summary, the welding procedure provided by the present invention for improving steam generator plugging efficiency, it is certainly molten using root face
The welding method of change realizes being welded to connect between plug and tube sheet so that maintenance personal can be efficient by one-handed performance
The plugging operation of exchange heat pipe is completed, while ensureing that weldquality is stable, nuclear radiation is effectively reduced and maintenance personal is good for
Health threatens.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (6)
1. a kind of welding procedure for improving steam generator plugging efficiency, it is characterised in that comprise the steps of：
S1, to being machined out for the plug that plugging is welded, stretch out to form annular root face on the outer wall of plug；
S2, mach plug will be completed on welding head, and the welding head for being provided with plug is inserted into needs
In the heat exchanger tube for carrying out plugging operation, the root face on plug is set to be steadily contacted with tube sheet；
S3, welding head is opened, annular is carried out to root face from melting welding so that plug is connected with Tube-sheet Welding, completes exchange heat pipe
Plugging operation.
2. the welding procedure of steam generator plugging efficiency is improved as claimed in claim 1, it is characterised in that described S1
In, the section for being provided with the plug 1 of annular root face 2 is in " ten " font.
3. the welding procedure of steam generator plugging efficiency is improved as claimed in claim 2, it is characterised in that described plug
External diameter match with the internal diameter of heat exchanger tube for needing to carry out plugging operation.
4. the welding procedure of steam generator plugging efficiency is improved as claimed in claim 2, it is characterised in that described S2
In, when plug is arranged on welding head, positioned by the way that root face is fastened on welding head；And cause root face
Certain distance is kept with the tungsten electrode on welding head and is relatively fixed.
5. the welding procedure of steam generator plugging efficiency is improved as claimed in claim 4, it is characterised in that described S2
In, when plug is arranged in heat exchanger tube by welding head insertion, the external diameter of the root face on plug is more than the external diameter of heat exchanger tube
2mm~10mm.
6. the welding procedure of steam generator plugging efficiency is improved as claimed in claim 1, it is characterised in that described S2
In, welding head uses Gas Tungsten Arc Welding head, realizes 360 ° of ring rotations of arc pole, certainly molten to the annular of root face to realize
Weldering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710743687.1A CN107470747B (en) | 2017-08-25 | 2017-08-25 | Welding process for improving pipe plugging efficiency of steam generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710743687.1A CN107470747B (en) | 2017-08-25 | 2017-08-25 | Welding process for improving pipe plugging efficiency of steam generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107470747A true CN107470747A (en) | 2017-12-15 |
| CN107470747B CN107470747B (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710743687.1A Active CN107470747B (en) | 2017-08-25 | 2017-08-25 | Welding process for improving pipe plugging efficiency of steam generator |
Country Status (1)
| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189842A (en) * | 2019-05-09 | 2019-08-30 | 中核核电运行管理有限公司 | A kind of nuclear reactor neutron flux pipe plug plumber's skill |
| CN112719535A (en) * | 2020-12-24 | 2021-04-30 | 上海电气核电设备有限公司 | Pipe plate plug of pipe and welding method |
| CN114632986A (en) * | 2022-05-20 | 2022-06-17 | 西安热工研究院有限公司 | Brazing pipe plugging method for high-temperature gas cooled reactor steam generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189842A (en) * | 2019-05-09 | 2019-08-30 | 中核核电运行管理有限公司 | A kind of nuclear reactor neutron flux pipe plug plumber's skill |
| CN112719535A (en) * | 2020-12-24 | 2021-04-30 | 上海电气核电设备有限公司 | Pipe plate plug of pipe and welding method |
| CN114632986A (en) * | 2022-05-20 | 2022-06-17 | 西安热工研究院有限公司 | Brazing pipe plugging method for high-temperature gas cooled reactor steam generator |
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|---|---|
| CN107470747B (en) | 2020-06-23 |
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