CN103817415A - Welding method for titanium tube with ultra-thin wall - Google Patents
Welding method for titanium tube with ultra-thin wall Download PDFInfo
- Publication number
- CN103817415A CN103817415A CN201410067020.0A CN201410067020A CN103817415A CN 103817415 A CN103817415 A CN 103817415A CN 201410067020 A CN201410067020 A CN 201410067020A CN 103817415 A CN103817415 A CN 103817415A
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- Prior art keywords
- tube
- welding
- heat exchanger
- wall
- exchanger tube
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Classifications
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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
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
-
- 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
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
Abstract
The invention belongs to the field of welding, and particularly relates to a welding method for a titanium tube with an ultra-thin wall. The welding method comprises the following steps: a hole is drilled in a tube plate, and a heat exchange tube and the tube plate are assembled after the ends of the heat exchange tube are cleaned, wherein it is guaranteed that the length of the portion, extending out of the tube plate, of the heat exchange tube ranges from 1mm to 2mm, and the distance between the outer wall of the heat exchange tube and the pore wall of the tube is not larger than 0.15mm; a tube plate automatic welding machine is adopted, and argon shields are formed on both the outer wall and the inner wall of the heat exchange tube; the purity of argon reaches 99.999 percent, so that the argon is high-purity argon, and a welding gun is closely attached to a workpiece to conduct all-position welding. According to the welding method for the titanium tube with the ultra-thin wall, gas shields are formed on both the outer wall and the inner wall of a tube in the welding process, so that welding gas is synchronous with gas inside the tube and gas outside the tube, the gas is saved, and oxidation does not occur easily in the welding process; by the adoption of the welding method, a heat exchange tube with the wall thickness being equal to or smaller than 0.8mm can be welded, the heat exchange tube and the tube plate are well fused after being welded, and a leakage does not easily occur in a striking and pressing process.
Description
Technical field
The invention belongs to welding field, relate in particular to a kind of welding method of titanium ultra-thin tube.
Background technology
Titanium heat exchanger, bobbin carriage adopts titanium explosive clad plate and titanium pipe Welding Structure conventionally.Because titanium material price is higher, in order to reduce costs, on the basis that meets design strength, in design multiselect with tube wall compared with the heat exchanger tube of thin structure, but concerning each manufactory, tube wall is thinner, welding difficulty is larger, if can solve titanium tube of thin wall and a Tube-sheet Welding difficult problem, can reduce a large amount of purchase costs for enterprise undoubtedly.
Conventionally be the welding of 0.8 millimeter and above pipe thickness for heat exchanger tube wall thickness, be easier to realize welding, but easily occur after welding: lack of fusion after heat exchanger tube and Tubesheet Welding, weld seam severe oxidation, weld penetration is shallow, suppresses problems such as being easy to leakage, causes a large amount of reprocessing.Do not have especially maturation process to complete for 0.8 millimeter of thickness and the welding of following heat exchanger tube, this has also become the biggest problem of restriction enterprise processing and manufacturing titanium heat transmission equipment.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of welding method of titanium ultra-thin tube, be intended to solve for 0.8 millimeter and the welding of following heat exchanger tube, lack of fusion after heat exchanger tube and Tubesheet Welding, weld seam severe oxidation, weld penetration is shallow, suppresses problems such as being easy to leakage.
The present invention is achieved in that a kind of welding method of titanium ultra-thin tube, it is characterized in that, comprises following step:
1) on tube sheet, hole, pour out 1X35 ° of chamfering in the one end in hole, size and the heat exchanger tube of holing are supporting;
2) before assembling, first heat exchanging pipe end carries out acid solution cleaning, removes oxide, then with clear water, acid solution is clean, until expose silvery white metallic luster;
3) heat exchanger tube and tube sheet assembling, together with first a tube sheet being installed to set of heat exchange tubes, tube sheet one end is fixed by frock, guarantees that it is 1～2 millimeter that heat exchanger tube stretches out tubesheet strength, and heat exchanger tube outer wall is to pore span from being no more than 0.15 millimeter;
4) heat exchanger tube and Tube-sheet Welding:
Adopt tube sheet automatic welding machine, the two-sided argon shield of heat exchanger tube outer wall and inwall; Purity of argon 99.999% high-purity argon, welding gun and workpiece fit tightly, all-position welding; The welding parameter that tube sheet automatic welding machine adopts is: adopt pulse frequency to be no more than 0.2 second;
Welding parameter: tube head is from melting welding, straight polarity direct current;
Heat exchanger tube outer wall and inwall by welding are supplied gas the time in advance: 3.5S, stops stagnant supplying gas the time: 5S after arc;
Welding current: base value: 40A, base value time: 0.1S, peak value: 110A, time to peak: 0.1S;
Down slope time: 5S;
Argon flow amount: weld seam side 10～12L/min, welded pipe inwall side: 8～10L/min;
Welding current starts the position of decaying: 365 °;
Welding gun rotation speed guarantees that speed of welding is: 200～260mm/min;
Tungsten electrode type and diameter: cerium tungsten electrode, diameter of phi 2.5mm; Nozzle diameter Φ 8mm.
Tube sheet automatic welding machine comprises nozzle, can stretch into locator and gas hood in heat exchanger tube, cerium tungsten electrode is set in nozzle, locator comprises the water cooling tube being fixedly connected with the head of bonding machine, circulating water channel is set in water cooling tube, be connected with water circulating pump by water pipe, the other end of water cooling tube is connected with termination, location, termination, location is by being connected with water cooling tube an air inlet communicating pipe, the end of termination, location is sub-air chamber, air inlet pipe in straight-through sub-air chamber was set in air inlet communicating pipe, air inlet communicating pipe sidewall air inlet is set, this air inlet connects inlet duct by high temperature resistant tracheae, sub-air chamber's surrounding arranges multiple ventholes, this venthole and air inlet pipe conducting.
Further, the angle between the central shaft of nozzle and the central shaft of locator is 10～20 °.
Further, heat exchanger tube outer wall is to pore span from being between 0.1～0.15 millimeter.
The present invention compared with prior art; beneficial effect is: the welding method of the present invention of employing and the welding gun adopting; realize the two-sided gas shield of inside pipe wall and outer wall, in welding process, the inside and outside gas of welding and pipe is realized synchronous; and saving gas; when welding, be not easy to occur oxidation, due to adopted welding method, can realize 0.8 millimeter and the welding of following heat exchanger tube; after heat exchanger tube and Tubesheet Welding, fusion well, is suppressed and is not easy to reveal.
Accompanying drawing explanation
Fig. 1 is the placement location structural representation of the welding gun that provides of the embodiment of the present invention;
Fig. 2 is the structural representation of the welding gun that provides of the embodiment of the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The method adopts following step:
1) boring on tube sheet 1, pours out 1X35 ° of chamfering in the one end in hole, the size of holing and heat exchanger tube 2 are supporting;
2) before assembling, first exchange heat pipe 2 terminations and carry out acid solution cleaning, remove oxide, then with clear water, acid solution is clean, until expose silvery white metallic luster;
3) heat exchanger tube 2 is assembled with tube sheet 1, and together with first a tube sheet 1 being assembled into heat exchanger tube 2, tube sheet 1 one end is fixed by frock, guarantees that it is 1.5 millimeters that heat exchanger tube 2 stretches out tubesheet strength, and heat exchanger tube 2 outer walls are to pore span from being 0.15 millimeter;
4) heat exchanger tube and Tube-sheet Welding
As shown in Figure 1, adopt tube sheet automatic welding machine, the two-sided argon shield of heat exchanger tube outer wall and inwall; Purity of argon 99.999% high-purity argon, welding gun and workpiece fit tightly, all-position welding; The welding parameter that tube sheet automatic welding machine adopts is: adopt pulse frequency to be no more than 0.2 second;
Welding parameter: tube head is from melting welding, straight polarity direct current;
Heat exchanger tube outer wall and inwall by welding are supplied gas the time in advance: 3.5S, stops stagnant supplying gas the time: 5S after arc;
Welding current: base value: 40A, base value time: 0.1S, peak value: 110A, time to peak: 0.1S;
Down slope time: 5S, welding gun rotary speed is set as: 320 ‰;
Argon flow amount: weld seam side 10～12L/min, welded pipe inwall side: 8～10L/min;
Welding current starts the position of decaying: 365 °;
Speed of welding: 229mm/min;
Tungsten electrode type and diameter: cerium tungsten electrode, diameter of phi 2.5mm; Nozzle diameter Φ 8mm.
As illustrated in fig. 1 and 2, tube sheet automatic welding machine comprises nozzle 4, can stretch into locator 6 and gas hood 3 in heat exchanger tube 2, cerium tungsten electrode 5 is set in nozzle 4, angle between the central shaft of the central shaft of nozzle 4 and locator 6 is 10～20 °, locator 6 comprises the water cooling tube 61 being fixedly connected with the head of bonding machine, connected mode is for being threaded, the interior circulating water channel 64 that arranges of water cooling tube 61, be connected with water circulating pump by water pipe, the other end of water cooling tube 61 is connected with termination, location, termination, location was connected with water cooling tube 61 by the air inlet communicating pipe 62 of one end, the end of termination, location is sub-air chamber 63, air inlet communicating pipe 62 is interior arranges the air inlet pipe 65 in straight-through sub-air chamber 63, air inlet communicating pipes 62 sidewall air inlet 66 is set, this air inlet 66 connects inlet duct by high temperature resistant tracheae, sub-air chamber's 63 surroundings arrange multiple ventholes 67, this venthole and air inlet pipe conducting.
When welding, locator is stretched in pipe, regulate charge flow rate, in heat exchanger tube outer wall and inwall, carry out gas protection simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a welding method for titanium ultra-thin tube, is characterized in that, comprises following step:
1) on tube sheet, hole, pour out 1X35 ° of chamfering in the one end in hole, size and the heat exchanger tube of holing are supporting;
2) before assembling, first heat exchanging pipe end carries out acid solution cleaning, removes oxide, then with clear water, acid solution is clean, until expose silvery white metallic luster;
3) heat exchanger tube and tube sheet assembling, together with first a tube sheet being installed to set of heat exchange tubes, tube sheet one end is fixed by frock, guarantees that it is 1～2 millimeter that heat exchanger tube stretches out tubesheet strength, and heat exchanger tube outer wall is to pore span from being no more than 0.15 millimeter;
4) heat exchanger tube and Tube-sheet Welding:
Adopt tube sheet automatic welding machine, the two-sided argon shield of heat exchanger tube outer wall and inwall; Purity of argon 99.999% high-purity argon, welding gun and workpiece fit tightly, all-position welding; The welding parameter that tube sheet automatic welding machine adopts is: adopt pulse frequency to be no more than 0.2 second;
Welding parameter: tube head is from melting welding, straight polarity direct current;
Heat exchanger tube outer wall and inwall by welding are supplied gas the time in advance: 3.5S, stops stagnant supplying gas the time: 5S after arc;
Welding current: base value: 40A, base value time: 0.1S, peak value: 110A, time to peak: 0.1S;
Down slope time: 5S;
Argon flow amount: weld seam side 10～12L/min, welded pipe inwall side: 8～10L/min;
Welding current starts the position of decaying: 365 °;
Welding gun rotation speed guarantees that speed of welding is: 200～260mm/min;
Tungsten electrode type and diameter: cerium tungsten electrode, diameter of phi 2.5mm; Nozzle diameter Φ 8mm.
Tube sheet automatic welding machine comprises nozzle, can stretch into locator and gas hood in heat exchanger tube, cerium tungsten electrode is set in nozzle, locator comprises the water cooling tube being fixedly connected with the head of bonding machine, circulating water channel is set in water cooling tube, be connected with water circulating pump by water pipe, the other end of water cooling tube is connected with termination, location, termination, location is by being connected with water cooling tube an air inlet communicating pipe, the end of termination, location is sub-air chamber, air inlet pipe in straight-through sub-air chamber was set in air inlet communicating pipe, air inlet communicating pipe sidewall air inlet is set, this air inlet connects inlet duct by high temperature resistant tracheae, sub-air chamber's surrounding arranges multiple ventholes, this venthole and air inlet pipe conducting.
2. according to the welding method of titanium ultra-thin tube claimed in claim 1, it is characterized in that, the angle between the central shaft of nozzle and the central shaft of locator is 10～20 °.
3. according to the welding method of titanium ultra-thin tube claimed in claim 1, it is characterized in that, heat exchanger tube outer wall is to pore span from being between 0.1～0.15 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410067020.0A CN103817415B (en) | 2014-02-26 | 2014-02-26 | A kind of welding method of titanium ultra-thin tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410067020.0A CN103817415B (en) | 2014-02-26 | 2014-02-26 | A kind of welding method of titanium ultra-thin tube |
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| Publication Number | Publication Date |
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| CN103817415A true CN103817415A (en) | 2014-05-28 |
| CN103817415B CN103817415B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410067020.0A Expired - Fee Related CN103817415B (en) | 2014-02-26 | 2014-02-26 | A kind of welding method of titanium ultra-thin tube |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105081538A (en) * | 2015-08-25 | 2015-11-25 | 哈电集团（秦皇岛）重型装备有限公司 | Process for automatically welding small-specification thin-walled tube and small-holed axle tube plate |
| CN106180985A (en) * | 2015-06-01 | 2016-12-07 | 郑州科源耐磨防腐工程有限公司 | A kind of titanium plate automatic tungsten anode argon arc welding technique |
| CN107088698A (en) * | 2017-03-10 | 2017-08-25 | 鲁西工业装备有限公司 | A kind of exchanger tubes and tubesheets automatic welding positioning and cooling device and automatic soldering method |
| CN107470747A (en) * | 2017-08-25 | 2017-12-15 | 上海电气核电设备有限公司 | Improve the welding procedure of steam generator plugging efficiency |
| CN108188553A (en) * | 2018-01-30 | 2018-06-22 | 南京德邦金属装备工程股份有限公司 | A kind of zirconium Tube Sheet of Heat Exchanger brilliance welding line automatic welding gas shield device |
| CN110253115A (en) * | 2019-06-21 | 2019-09-20 | 隆华科技集团（洛阳）股份有限公司 | A kind of welding method for titanium or titanium alloy threaded plug type air cooler tube sheet angle joint |
| CN110303278A (en) * | 2019-07-08 | 2019-10-08 | 四川科新机电股份有限公司 | A kind of the group to point mounted welder and group to point soldering method of tube-tube plate internal bore welding |
| CN112059372A (en) * | 2020-09-10 | 2020-12-11 | 张家港市恒强冷却设备有限公司 | Welding process for base pipe and pipe plate of thin-wall air cooler |
| CN112191998A (en) * | 2020-08-27 | 2021-01-08 | 兴化日成金属制品有限公司 | Column type welding process for small workpieces |
| CN112496544A (en) * | 2020-09-30 | 2021-03-16 | 上海交通大学 | Efficient welding method and device for thin-wall welding titanium tube by arc-assisted laser |
| CN113399793A (en) * | 2021-06-15 | 2021-09-17 | 广东开放大学（广东理工职业学院） | Thin-wall titanium tube robot welding method |
| CN114473273A (en) * | 2022-03-14 | 2022-05-13 | 二重（德阳）重型装备有限公司 | Liquid cooling support tool for plug-in type connecting pipe and anti-deformation method for reactor core measuring pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0727275A1 (en) * | 1995-02-18 | 1996-08-21 | BDAG Balcke-Dürr Aktiengesellschaft | Method of welding the ends of thin-walled heat exchanger tubes free of residual crevices |
| JP2003225764A (en) * | 2002-02-05 | 2003-08-12 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for welding thin-walled tube to thick plate |
| CN102717175A (en) * | 2012-06-20 | 2012-10-10 | 东方电气集团东方锅炉股份有限公司 | Automatic argon arc seal welding method for narrow gap between deep grooves of tube plate and heat exchange tube |
| CN203140951U (en) * | 2013-02-26 | 2013-08-21 | 甘肃蓝科石化高新装备股份有限公司 | Gas protection device for all-position tube plate automatic argon arc welding |
| CN203418217U (en) * | 2013-07-29 | 2014-02-05 | 张家港化工机械股份有限公司 | Heat exchange tube inner wall protecting tool when argon arc welding is carried out on heat exchange tube and tube plate |
-
2014
- 2014-02-26 CN CN201410067020.0A patent/CN103817415B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0727275A1 (en) * | 1995-02-18 | 1996-08-21 | BDAG Balcke-Dürr Aktiengesellschaft | Method of welding the ends of thin-walled heat exchanger tubes free of residual crevices |
| JP2003225764A (en) * | 2002-02-05 | 2003-08-12 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for welding thin-walled tube to thick plate |
| CN102717175A (en) * | 2012-06-20 | 2012-10-10 | 东方电气集团东方锅炉股份有限公司 | Automatic argon arc seal welding method for narrow gap between deep grooves of tube plate and heat exchange tube |
| CN203140951U (en) * | 2013-02-26 | 2013-08-21 | 甘肃蓝科石化高新装备股份有限公司 | Gas protection device for all-position tube plate automatic argon arc welding |
| CN203418217U (en) * | 2013-07-29 | 2014-02-05 | 张家港化工机械股份有限公司 | Heat exchange tube inner wall protecting tool when argon arc welding is carried out on heat exchange tube and tube plate |
Non-Patent Citations (1)
| Title |
|---|
| 苗刚 等: "钛制热交换器管板自动焊工装改进", 《石油化工设备》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106180985A (en) * | 2015-06-01 | 2016-12-07 | 郑州科源耐磨防腐工程有限公司 | A kind of titanium plate automatic tungsten anode argon arc welding technique |
| CN105081538A (en) * | 2015-08-25 | 2015-11-25 | 哈电集团（秦皇岛）重型装备有限公司 | Process for automatically welding small-specification thin-walled tube and small-holed axle tube plate |
| CN107088698A (en) * | 2017-03-10 | 2017-08-25 | 鲁西工业装备有限公司 | A kind of exchanger tubes and tubesheets automatic welding positioning and cooling device and automatic soldering method |
| CN107470747A (en) * | 2017-08-25 | 2017-12-15 | 上海电气核电设备有限公司 | Improve the welding procedure of steam generator plugging efficiency |
| CN108188553A (en) * | 2018-01-30 | 2018-06-22 | 南京德邦金属装备工程股份有限公司 | A kind of zirconium Tube Sheet of Heat Exchanger brilliance welding line automatic welding gas shield device |
| CN110253115A (en) * | 2019-06-21 | 2019-09-20 | 隆华科技集团（洛阳）股份有限公司 | A kind of welding method for titanium or titanium alloy threaded plug type air cooler tube sheet angle joint |
| CN110303278A (en) * | 2019-07-08 | 2019-10-08 | 四川科新机电股份有限公司 | A kind of the group to point mounted welder and group to point soldering method of tube-tube plate internal bore welding |
| CN112191998A (en) * | 2020-08-27 | 2021-01-08 | 兴化日成金属制品有限公司 | Column type welding process for small workpieces |
| CN112059372A (en) * | 2020-09-10 | 2020-12-11 | 张家港市恒强冷却设备有限公司 | Welding process for base pipe and pipe plate of thin-wall air cooler |
| CN112496544A (en) * | 2020-09-30 | 2021-03-16 | 上海交通大学 | Efficient welding method and device for thin-wall welding titanium tube by arc-assisted laser |
| CN113399793A (en) * | 2021-06-15 | 2021-09-17 | 广东开放大学（广东理工职业学院） | Thin-wall titanium tube robot welding method |
| CN114473273A (en) * | 2022-03-14 | 2022-05-13 | 二重（德阳）重型装备有限公司 | Liquid cooling support tool for plug-in type connecting pipe and anti-deformation method for reactor core measuring pipe |
| CN114473273B (en) * | 2022-03-14 | 2023-01-20 | 二重（德阳）重型装备有限公司 | Liquid cooling support tool for plug-in type connecting pipe and anti-deformation method for reactor core measuring pipe |
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| CN103817415B (en) | 2015-11-25 |
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