CN114632986B - Brazing pipe plugging method for high-temperature gas cooled reactor steam generator - Google Patents
Brazing pipe plugging method for high-temperature gas cooled reactor steam generator Download PDFInfo
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- CN114632986B CN114632986B CN202210548020.7A CN202210548020A CN114632986B CN 114632986 B CN114632986 B CN 114632986B CN 202210548020 A CN202210548020 A CN 202210548020A CN 114632986 B CN114632986 B CN 114632986B
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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
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3093—Fe as the principal constituent with other elements as next major constituents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Abstract
The invention provides a brazing pipe plugging method for a high-temperature gas cooled reactor steam generator, relates to the technical field of nuclear power safe operation and maintenance guarantee, and is designed for solving the problems of low automation degree and poor reliability in a pipe plugging process. The brazing pipe blocking method comprises the steps of prefabricating a brazing filler metal layer on the surface of a plug body by a thermal spraying method; processing the surface of the brazing filler metal layer, and polishing the inner wall of the heat exchange pipe; inserting the plug body into an inner hole of the heat exchange tube to form interference fit, and heating and melting the brazing filler metal layer by using induction heating, wherein the heating temperature is 1000-1300 ℃; and then reducing the induction heating power, keeping the local heating temperature at the welding seam between 800 and 900 ℃ for 30 to 90min, and fully diffusing the brazing filler metal and the base metal. According to the method, the brazing filler metal layer is prepared on the surface of the plug body in advance, and only the heating process needs to be controlled in the pipe plugging process. Compared with the prior art, the sealing device has the advantages of good sealing effect, simple equipment, concise and reliable process and contribution to automation.
Description
Technical Field
The invention relates to the technical field of nuclear power safe operation and maintenance, in particular to a brazing pipe plugging method of a high-temperature gas cooled reactor steam generator.
Background
The steam generator is a core device of a steam power conversion system of the nuclear power station, transmits heat generated by a primary side reactor core to a secondary side through a U-shaped pipe bundle, separates and dries water vapor of the two loops, and transmits the water vapor to the steam turbine for power generation. The heat exchange tube is an important component of a primary circuit pressure boundary, is an important barrier for preventing radioactive fission products from leaking, and is one of the weakest links of a primary circuit system. The heat exchange tube can generate mechanical or chemical damage under the high-temperature and high-pressure environment and the washing of a medium with high radiation dose for a long time, and when the damage of the heat exchange tube reaches the damage maintenance standard, plugs are required to be respectively added at two ends of the heat exchange tube to isolate the damaged heat exchange tube from a primary circuit medium so as to prevent radioactive coolant materials from leaking.
The traditional pipe blocking mode has two modes of mechanical pipe blocking and welding pipe blocking. The mechanical pipe plugging adopts a simple mechanical method, a specially-made plug is extruded into the heat exchange pipe to generate residual stress, and the pipe is plugged by the close contact between the outer wall of the plug and the inner wall of the pipe. This technique is simple to operate, but has the disadvantage that the blind pipe will fail immediately once the stress is relaxed or lost. The pipe plugging is welded by fusing the local parts of the base material of the plug material and the damaged pipe together by using a welding method, and achieving certain coupling strength and sealing performance by using metal fusion. The welding pipe blockage sealing effect is good, the technology is reliable, but the defects are that the welding process is complicated, and the automation degree is low.
Compared with an in-service pressurized water reactor steam generator system, the service temperature of a steam generator heating pipe in a high-temperature gas cooled reactor is higher, the temperature of a primary side is increased to 750 ℃ from 343 ℃, and a water supply end and a steam outlet end of a heat exchange pipe are respectively made of two different alloy steels of T22 and Incoloy 800H. The mechanical pipe plugging method applied to the conventional pressurized water reactor may fail due to stress relaxation at high temperature, and the characteristics of high temperature, high radiation and narrow space in the high-temperature gas cooled reactor also put higher requirements on the automation degree of the pipe plugging technology.
Disclosure of Invention
The invention aims to provide a method for brazing and plugging a pipe of a high-temperature gas-cooled reactor steam generator, which aims to solve the technical problems of low automation degree and poor reliability of the existing pipe plugging process.
The invention provides a brazing pipe plugging method for a high-temperature gas cooled reactor steam generator, which comprises the following steps of
The method comprises the following steps:
s1: prefabricating a brazing filler metal layer on the surface of the plug body by using a thermal spraying method;
s2: machining, namely machining the surface of the brazing filler metal layer; polishing the inner wall of the heat exchange pipe;
s3: melting and diffusing, inserting the processed plug body into an inner hole of the heat exchange tube to form interference fit, and heating and melting the brazing filler metal layer by using an induction heating method, wherein the heating temperature is 1000-1300 ℃; and then reducing the induction heating power, keeping the local heating temperature at the welding seam between 800 ℃ and 900 ℃ for 30min to 90min, and fully diffusing the brazing filler metal and the base metal.
The method for brazing and plugging the pipe of the high-temperature gas cooled reactor steam generator has the advantages that:
according to the method, the brazing filler metal layer is prepared on the surface of the plug body in advance, and only the heating process needs to be controlled in the pipe plugging process. Compared with the prior art, the sealing device has the advantages of good sealing effect, simple equipment, concise and reliable process and contribution to automation.
In the preferred technical scheme, the plug body is a cylinder, the material of the plug body is the same as that of the heat exchange tube, and the starting area of the solder layer spraying and the plug body are arranged at the outer end.
In a preferable technical scheme, the length of the brazing filler metal layer is 3mm-5mm, the thickness of the brazing filler metal layer after machining is 0.05mm-0.1mm, and the surface roughness of the brazing filler metal layer after machining is not higher than Ra0.2 mu m; the diameter of the plug body is 5mm-13mm, and the length of the plug body is 30mm-100mm.
In a preferred technical scheme, the brazing filler metal layer comprises iron-based borosilicate alloy powder, and the weight ratio of each element of the iron-based borosilicate alloy powder is as follows: 1-3% of Cr, 0.5-2% of Mo0, 3-5% of B, 2-5% of Si and the balance of Fe; the iron-based borosilicate alloy powder is sprayed on the plug body through plasma spraying or ultrahigh-sound-speed flame spraying, and the particle size of the iron-based borosilicate alloy powder is 15-45 mu m.
In the preferred technical scheme, the iron-based borosilicate alloy powder is sprayed on a plug body arranged at the water supply end of the heat exchange tube.
In a preferred technical scheme, the brazing filler metal layer comprises nickel-based borosilicate alloy powder, and the weight ratio of each element of the nickel-based borosilicate alloy powder is as follows: 19-23% of Cr, 30-35% of Ni, 3-5% of B, 2-5% of Si and the balance of Fe; the nickel-based borosilicate alloy powder is sprayed on the plug body through plasma spraying or hypersonic flame spraying, and the particle size of the nickel-based borosilicate alloy powder is 15-45 mu m.
In a preferred technical scheme;
the nickel-based borosilicate alloy powder is sprayed on the plug body arranged at the main steam outlet end of the heat exchange tube.
In the preferable technical scheme, the pitch diameter of the induction coil used in the heating and melting process is consistent with the inner diameter of the heat exchange tube, the frequency is 10kHz-200kHz, the power is 5kW-50kW, the number of turns of the induction coil is 1-5, and the distance between the coil and the tube plate is 2mm-5mm.
In the preferable technical scheme, in the heat preservation step, the brazing filler metal layer and the base metal are fully diffused to form common crystal grains, the chemical components are in gradient transition, and the shearing bonding strength is higher than 300MPa.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present invention, the drawings needed to be used in the description of the embodiments or the background art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a brazing filler metal layer prepared in a brazing pipe plugging method of a high temperature gas cooled reactor steam generator according to an embodiment of the present invention;
FIG. 2 is a metallographic view of a solder layer bonded to a plug body according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a melting step in a brazing and pipe plugging method for a steam generator of a high temperature gas cooled reactor according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for brazing and plugging a tube of a steam generator of a high temperature gas cooled reactor according to an embodiment of the present invention.
Description of reference numerals:
1-a plug body; 2-brazing filler metal layer; 3-melting the brazing filler metal bundle; 4-a spray gun; 5, heat exchange tubes; 6-a tube plate; 7-induction coil.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 4, a method for brazing and plugging a tube of a steam generator of a high temperature gas cooled reactor includes the following steps:
s1: prefabricating a brazing filler metal layer on the surface of the plug body by a thermal spraying method;
s2: machining, namely machining the surface of the brazing filler metal layer; polishing the inner wall of the heat exchange pipe;
s3: melting and diffusing, inserting the processed plug body into an inner hole of the heat exchange tube to form interference fit, and heating and melting the brazing filler metal layer by using an induction heating method, wherein the heating temperature is 1000-1300 ℃; and then reducing the induction heating power to ensure that the local heating temperature at the welding seam is between 800 and 900 ℃, and preserving the heat for 30 to 90 minutes to ensure that the brazing filler metal and the base metal are fully diffused.
According to the method, the brazing filler metal layer is prepared on the surface of the plug body in advance, and only the heating process needs to be controlled in the pipe plugging process. Compared with the prior art, the sealing device has the advantages of good sealing effect, simple equipment, concise and reliable process and contribution to automation.
Preferably, the plug body is a cylinder, the material of the plug body is the same as that of the heat exchange tube, and the starting area for spraying the brazing filler metal layer and the plug body are arranged at the outer end.
Preferably, the length of the brazing filler metal layer is 3mm-5mm, the thickness of the brazing filler metal layer after machining is 0.05mm-0.1mm, and the surface roughness of the brazing filler metal layer after machining is not higher than Ra0.2 mu m; the diameter of the plug body is 5mm-13mm, and the length of the plug body is 30mm-100mm.
Preferably, the brazing filler metal layer comprises iron-based borosilicate alloy powder, and the weight ratio of each element of the iron-based borosilicate alloy powder is as follows: 1-3% of Cr, 0.5-2% of Mo0, 3-5% of B, 2-5% of Si and the balance of Fe; the iron-based borosilicate alloy powder is sprayed on the plug body by plasma spraying or ultrahigh-sound-speed flame spraying, and the particle size of the iron-based borosilicate alloy powder is 15-45 mu m.
Wherein, the iron is used for ensuring the wettability of the brazing filler metal layer, the plug body and the heat exchange tube, and the borosilicate is a melting reduction element.
The components of the brazing filler metal layer are basically consistent with those of the heat exchange tube except for the melting-reducing elements, so that the change of the components of the plug structure and the disintegration of the performance caused by overlarge component difference in the service process are avoided.
Preferably, the iron-based borosilicate alloy powder is sprayed on a plug body arranged at the water supply end of the heat exchange tube.
Preferably, the brazing filler metal layer comprises nickel-based borosilicate alloy powder, and the weight ratio of each element of the nickel-based borosilicate alloy powder is as follows: 19-23% of Cr, 30-35% of Ni, 3-5% of B, 2-5% of Si and the balance of Fe; the nickel-based borosilicate alloy powder is sprayed on the plug body by plasma spraying or hypersonic flame spraying, and the particle size of the nickel-based borosilicate alloy powder is 15-45 mu m.
Wherein, nickel is used for ensuring the wettability of the brazing filler metal layer with the plug body and the heat exchange tube, and borosilicate is a melting reduction element.
Preferably, the nickel-based borosilicate alloy powder is sprayed on the plug body arranged at the steam outlet end of the heat exchange tube.
The components of the brazing filler metal layer are basically consistent with those of the heat exchange tube except for the melting-reducing elements, so that the plug tissue component change and the performance disintegration caused by overlarge component difference in the service process are avoided.
Preferably, the pitch diameter of the induction coil used in heating and melting is consistent with the inner diameter of the heat exchange tube, the frequency is 10kHz-200kHz, the power is 5kW-50kW, the number of turns of the induction coil is 1-5, and the distance between the coil and the tube plate is 2mm-5mm.
Preferably, in the heat preservation step, the temperature is preserved for 30min to 90min at 800 ℃ to 900 ℃, so that the brazing filler metal layer and the base metal are fully diffused to form common crystal grains, the chemical components are in gradient transition, and the shearing bonding strength is higher than 300MPa.
The melting point of the brazing filler metal layer is increased and solidified, the inner wall of the heat exchange tube and the brazing filler metal layer form common crystal grains, and furthermore, the bonding strength of the plug and the heat exchange tube exceeds 320MPa.
The first embodiment is as follows:
the plug body is made of Incoloy800H high-temperature alloy, the length of the plug body is 50mm, and the diameter of the plug body is 12.95mm. As shown in figure 1, nickel-based boron-silicon alloy powder is formed into a molten brazing filler metal bundle 3 by a spray gun 4 in a plasma spraying mode, the molten brazing filler metal bundle is sprayed on a plug body 1, the particle size is 15-45 mu m, the powder feeding speed is 50g/min, the spraying power is 40kW, and a brazing filler metal layer 2 with the length of 5mm is prepared on the surface of the plug body. Wherein the nickel-based boron-silicon alloy powder comprises the following components: cr23.00%, ni35.00%, B4.50%, si3.50%, fe34.00%. As shown in figure 2, the brazing filler metal layer 2 has compact structure, no obvious oxide inclusion inside, no defects such as cracks, pores and the like, and the brazing filler metal layer 2 is well combined with the surface of the plug body 1.
Then, the surface of the brazing filler metal layer 2 was finished so that the surface roughness of the brazing filler metal layer 2 was not higher than Ra0.2 μm and the thickness was 0.08mm. And polishing the inner wall of the steam outlet end of the heat exchange pipe 5 to ensure that the roughness of the inner wall of the area matched with the plug body 1 is Ra0.14 mu m.
As shown in fig. 3, the plug body 1 is pushed into the steam outlet end of the heat exchange tube 5 to form an interference fit, the induction coil 7 is suspended in parallel at a position 3mm above the tube plate 6 to heat, the middle diameter of the induction coil 7 is consistent with the inner diameter of the heat exchange tube 5, the frequency is 150kHz, the power is 35kW, and the number of turns of the induction coil 7 is 1. An infrared colorimetric thermometer is adopted to monitor the temperature of the heating area, and the result shows that the position of the brazing filler metal layer can be heated to more than 1200 ℃ within 16s and is fully melted; and then entering a heat preservation stage, adjusting the distance between the induction coil 7 and the tube plate 6 to 6.5mm, and keeping the temperature of the brazing filler metal layer 2 between 800 and 850 ℃ through continuous power on-off, preserving the heat for 30min, fully diffusing the brazing filler metal layer 2 with the plug body 1 and the inner wall of the heat exchange tube 5, and displaying a shear test result that the average shear bonding strength between the plug and the heat exchange tube 5 is 377MPa. The helium leak detection test result shows that the plugged plug has no leakage.
Example two:
the plug body 1 is made of T22 heat-resistant steel, the length is 65mm, and the diameter is 13.00mm. As shown in figure 1, iron-based brazing filler metal powder is formed into a molten brazing filler metal bundle 3 by a spray gun 4 in a supersonic flame spraying mode, the molten brazing filler metal bundle is sprayed on a plug body 1, a brazing filler metal layer 2 with the length of 3.5mm is prepared on the surface of the plug body 1 by selecting the brazing filler metal bundle with the particle size of 15-45 microns, the powder feeding speed of 50g/min and the spraying power of 45 kW. Wherein the weight ratio of the elements of the iron-based brazing filler metal powder is as follows: cr2.5%, mo1.7%, B5%, si4.5%, fe86.3%.
The surface of the solder layer 2 was subjected to finish machining so that the surface roughness of the solder layer 2 was ra0.12 μm and the thickness was 0.05mm.
And polishing the inner wall of the steam outlet end of the heat exchange pipe 5 to ensure that the roughness of the inner wall of the matching area of the heat exchange pipe and the plug body 1 is not higher than Ra0.2 mu m. As shown in fig. 3, the plug body 1 is pushed into the steam outlet end of the heat exchange tube 5, the induction coil 7 is suspended in parallel at a position 2.5mm above the tube plate 6 for heating, the middle diameter of the induction coil 7 is consistent with the inner diameter of the heat exchange tube 5, the frequency is 200kHz, the melting point is higher than that of nickel-based brazing filler metal, the power is 45kW, and the number of turns of the induction coil is 1. And (3) monitoring the temperature of the heating area by using an infrared colorimetric thermometer, wherein the result shows that the position of the brazing filler metal layer 2 can be heated to be higher than 1230 ℃ within 19s, the brazing filler metal is fully melted, and then the brazing filler metal is cooled to the ambient temperature by air. The shear bonding strength test result shows that the average bonding strength of the plug and the heat exchange tube 5 is 321MPa. The helium leak detection test result shows that the plugged plug has no leakage.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In the above embodiments, the descriptions of the orientations such as "up", "down", etc. are based on the drawings.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The method for brazing and plugging the pipe of the high-temperature gas cooled reactor steam generator is characterized by comprising the following steps of:
s1: prefabricating a brazing filler metal layer on the surface of the plug body by a thermal spraying method; the plug body is a cylinder; if the plug body is arranged at the water supply end of the heat exchange tube, the plug body is made of T22 heat-resistant steel, the brazing filler metal layer comprises iron-based borosilicate alloy powder, and the weight ratio of each element of the iron-based borosilicate alloy powder is as follows: 1-3% of Cr, 0.5-2% of Mo0, 3-5% of B, 2-5% of Si and the balance of Fe; the iron-based borosilicate alloy powder is sprayed on the plug body by plasma spraying or ultrahigh-sound-speed flame spraying, and the particle size of the iron-based borosilicate alloy powder is 15-45 mu m; if the plug body is arranged at the main steam outlet end of the heat exchange tube, the plug body is made of Incoloy800H high-temperature alloy, the brazing filler metal layer comprises nickel-based borosilicate alloy powder, and the weight proportion of each element of the nickel-based borosilicate alloy powder is as follows: 19-23% of Cr, 30-35% of Ni, 3-5% of B, 2-5% of Si and the balance of Fe; the nickel-based borosilicate alloy powder is sprayed on the plug body by plasma spraying or hypersonic flame spraying, and the particle size of the nickel-based borosilicate alloy powder is 15-45 mu m;
s2: machining, namely machining the surface of the brazing filler metal layer; polishing the inner wall of the heat exchange pipe;
s3: melting and diffusing, inserting the processed plug body into an inner hole of the heat exchange tube to form interference fit, and heating and melting the brazing filler metal layer by using an induction heating method, wherein the pitch diameter of an induction coil used in heating and melting is consistent with the inner diameter of the heat exchange tube, and the heating temperature is 1000-1300 ℃; and then reducing the induction heating power, keeping the local heating temperature at the welding seam between 800 ℃ and 900 ℃ for 30min to 90min, and fully diffusing the brazing filler metal and the base metal.
2. The method for brazing and plugging the steam generator of the high temperature gas cooled reactor according to claim 1, wherein the material of the plug body is the same as that of the heat exchange tube, and the starting area of the brazing filler metal layer and the plug body are arranged at the outer end.
3. The method for brazing and plugging a steam generator in a high temperature gas cooled reactor according to claim 2, wherein the length of the brazing filler metal layer is 3mm to 5mm, the thickness of the brazing filler metal layer after machining is 0.05mm to 0.1mm, and the surface roughness of the brazing filler metal layer after machining is not higher than Ra0.2 μm; the diameter of the plug body is 5mm-13mm, and the length of the plug body is 30mm-100mm.
4. The method for brazing and plugging the steam generator of the high temperature gas cooled reactor according to claim 1, wherein the induction coil used during heating and melting has a frequency of 10kHz-200kHz, a power of 5kW-50kW, a number of turns of the induction coil of 1-5 and a distance between the coil and the tube plate of 2mm-5mm.
5. The method for brazing and plugging the steam generator of the high temperature gas cooled reactor according to any one of claims 1 to 4, wherein in the step of heat preservation, the brazing filler metal layer and the base metal are fully diffused to form common crystal grains, the chemical composition is in gradient transition, and the shearing bonding strength is higher than 300MPa.
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| CN202210548020.7A CN114632986B (en) | 2022-05-20 | 2022-05-20 | Brazing pipe plugging method for high-temperature gas cooled reactor steam generator |
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| CN202210548020.7A CN114632986B (en) | 2022-05-20 | 2022-05-20 | Brazing pipe plugging method for high-temperature gas cooled reactor steam generator |
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| JPS57193298A (en) * | 1981-05-23 | 1982-11-27 | Sumikin Yousetsubou Kk | Wire for narrow groove gas shielded welding |
| IT1200309B (en) * | 1986-10-29 | 1989-01-12 | Ansaldo Spa | PROCEDURE FOR THE CAPPING OF TUBE PLATES BY BRAZED WELDED CAPS |
| CN101524779A (en) * | 2008-03-05 | 2009-09-09 | 丹阳市友和工具有限责任公司 | Brazing technology for diamond |
| CN106119761A (en) * | 2016-08-30 | 2016-11-16 | 郑州机械研究所 | A kind of hard alloy composite block and preparation method thereof |
| CN107470747B (en) * | 2017-08-25 | 2020-06-23 | 上海电气核电设备有限公司 | Welding process for improving pipe plugging efficiency of steam generator |
| CN111014865A (en) * | 2019-12-17 | 2020-04-17 | 西安聚能装备技术有限公司 | Vacuum sealing device and sealing method for powder tube filling |
| CN113478038A (en) * | 2021-07-08 | 2021-10-08 | 西安热工研究院有限公司 | Composite welding method for copper pipe of air cooler |
| CN114131136A (en) * | 2021-12-01 | 2022-03-04 | 中核四0四有限公司 | Device and method for brazing plug of palladium-silver-gold-nickel tube |
| CN114260568A (en) * | 2021-12-31 | 2022-04-01 | 西安热工研究院有限公司 | High-temperature gas cooled reactor steam generator water supply end laser welding pipe plugging device and method |
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