CN105382416B - Guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor - Google Patents
Guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor Download PDFInfo
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- CN105382416B CN105382416B CN201511013493.3A CN201511013493A CN105382416B CN 105382416 B CN105382416 B CN 105382416B CN 201511013493 A CN201511013493 A CN 201511013493A CN 105382416 B CN105382416 B CN 105382416B
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- welding
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- laser welding
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention belongs to welding technology fields, disclose the method for laser welding that guide cylinder in a kind of nuclear reactor is oriented to sheath, include the following steps：（1）The interface for being oriented to sheath weldment is machined out, interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect；（2）It is clamped after being oriented to the positioning of sheath weldment root face by fixture, interface gap≤0.02mm；（3）The tack welding fitting on fusion length direction；（4）Laser welding is carried out to the abutment joint for being oriented to sheath weldment under nitrogen protection；（5）Isothermal holding 2 hours or more is carried out after the completion of welding at a temperature of 400 DEG C ± 15 DEG C.Welding process of the present invention is simple, and speed of welding is fast, and welding forming is excellent, physicochemical property is good, and deformation is controllable, work circumstances safe.
Description
Technical field
The invention belongs to welding technology field, guide cylinder is oriented to the laser welding side of sheath in particularly a kind of nuclear reactor
Method.
Background technology
Guide assembly is a particularly important component in pressure water reactor of nuclear reaction in-pile component, and the accuracy of manufacture requires
Height requires the control of welding deformation harsh.Guide cylinder quantity is usually 69 sets in 1000MW presurized water reactors, is often covered in guide cylinder
Include 8 sets of guiding sheath components（Or " duplex tube assembly ", 4 sets of 45 ° of guiding sheaths and 4 sets of 90 ° of guiding sheaths）, wrap in each unit
Containing 552 sets of guiding sheath components.It is more in the pressurized water reactor type of 1400MW, it is 712 sets.
Existing welding method is by vacuum electron beam welding, since its material is austenitic stainless steel, in vacuum item
Electron beam welding under part can realize high weldering speed, low heat input, free of contamination welding.Welding deformation is small, and appearance of weld is good
It is good.
However, existing vacuum electron beam welding method, needs after assembly station completes assembling, vacuum chamber is moved into, then
Carry out vacuum pumping, vacuum degree reach after high requirement can welding, postwelding need to be inflated operation, after reply normal pressure
Weldment can be taken out and carry out subsequent survey and processing.Vacuum chamber assembles, vacuumizes, inflating etc. that operating procedures are complicated, need when
Between be weld interval several times even ten several times, for enormous amount guiding sheath component welding for, inefficiency.Separately
Outside, vacuum electron beam welding must increase X-ray protection, there is security risk.
Invention content
In order to solve the above technical problem, the present invention provides the laser welding sides that guide cylinder in a kind of nuclear reactor is oriented to sheath
Method realizes the laser welding under non-vacuum environment, and welding process is easy to operate, and forming is excellent, physicochemical property is good, and deformation can
Control.
The technical solution adopted by the present invention is that：
Guide cylinder is oriented to the method for laser welding of sheath in a kind of nuclear reactor, it is characterized in that, include the following steps：
（1）The interface for being oriented to sheath weldment is machined out, interface machining accuracy reaches sight check zero defect,
Liquid penetration test zero defect；
（2）It is clamped after being oriented to the positioning of sheath weldment root face by fixture, interface gap≤0.02mm；
（3）The tack welding fitting on fusion length direction；
（4）Laser welding is carried out to the abutment joint for being oriented to sheath weldment under nitrogen protection；
（5）Isothermal holding 2 hours or more is carried out after the completion of welding at a temperature of 400 DEG C ± 15 DEG C.
Further, described（2）In build-up tolerance control within 0.02mm.
Further, described（3）It is positioned as welding positioning in step, positions position at least three, tack welding in welded joints
Laser welding is connected in, positioning welding carries out in a nitrogen environment.
Further,：Described（3）The middle positioning of step is completed by clamping device, and the clamping device is complete in weld seam
Apply uniform pretightning force on length direction and realize positioning.
Further, described（4）Step further includes the step of being preheated the guiding sheath weldment, preheating temperature >=15
℃。
Further, described（4）Laser welding position in step is downhand welding or horizontal position welding, welds temperature≤175 DEG C between road, weldering
Laser power is connect as 1kw ± 0.5kw, defocusing amount is -1 to+10 mm/KW, and speed of welding is 80 ± 30mm/s, welding laser with
Continuous wave and multi-mode laser beam mode emit.
Further, the welding laser beam axis and weld seam angle are 90 ° ± 2 °.
Further, the nitrogen carries out welding protection with airflow pattern, nitrogen gas concn >=99.99%, nitrogen flow for 40 ±
10L/min。
Further, blow-out gas is set in the welding process, and the blow-out gas and weld seam angle are 50 ° ± 2 °, apart from workpiece
Surface 5mm ± 2mm.
Further, the material for being oriented to sheath weldment for the P8 types in 304 austenitic stainless steels or ASME standards not
Become rusty steel.
The beneficial effects of the invention are as follows：
（1）Welding process is simple, and speed of welding is fast；
（2）Welding forming is excellent, physicochemical property is good, and deformation is controllable；
（3）Work circumstances safe.
Description of the drawings
Attached drawing 1 is the structure schematic cross-sectional view of 90 ° of guiding sheath weldments；
Attached drawing 2 is the structure schematic cross-sectional view of 45 ° of guiding sheath weldments；
Attached drawing 3 is flow chart of the method for the present invention.
Specific embodiment
The specific embodiment party of the method for laser welding of sheath is oriented to guide cylinder in nuclear reactor of the present invention below in conjunction with the accompanying drawings
Formula elaborates.
Laser Welding is a kind of high energy beam welding method, compared to traditional welding electrode arc welding（SMAW）, non-melt pole gas protect
Shield weldering（GTAW）Etc. welding methods, heat-source energy density is big, speed of welding is high, heat input is low, welding seam deep width ratio is big, seam organization
Even compact, joint performance be excellent and easily controllable welding deformation amount and the welding deformation uniformity.Guide cylinder is in presurized water reactor heap
Important component in component in upper-part in-reactor component, play the guiding role to control rod, and accuracy of manufacture requirement is high, and material
Expect for same type stainless steel in 304 type austenitic stainless steel of core grade or ASME P8, be very suitable for playing the advantage of Laser Welding.
Referring to attached drawing 1,2,45 ° of guiding sheaths and 90 ° of guiding sheath weldments weld to form guide cylinder guiding sheath in nuclear reactor,
Welding penetration wants ﹥ 0.8mm, and size will reach design requirement.
The welding technique of the present invention can be used for leading for the models units such as the imperial No.1 of CAP1400, AP1000, China, M310
The welding manufacture of sheath is oriented to cylinder, it is all or part of to replace being oriented to sheath vacuum electron beam welding technique.Laser Welding does not need to vacuum
Electron beam vacuumizes pumping deflation course, and without X ray Radiation risk, have inherent advantage, welding efficiency is up to vacuum electronic
Beam welding 2~4 times in addition more than；In addition, relative to electron-bombardment welding, laser welding process allows straight after completing to assemble
Capable welding is tapped into, without welding tooling is needed to change, reduces operating procedure and time before weldering, plays and improve guide cylinder manufacture efficiency,
Shorten the effect of manufacturing cycle.
Referring to attached drawing 3, welding method of the invention is as follows：
（1）The interface for being oriented to sheath weldment is machined out, interface machining accuracy reaches sight check zero defect,
Liquid penetration test zero defect is oriented to sheath weldment square groove, interface directly is realized butt welding.
（2）It is clamped after being oriented to the positioning of sheath weldment root face by fixture, interface gap≤0.02mm, build-up tolerance control
System is within 0.02mm.
（3）Position positioning welding is also laser welding at positioning welding positioning at least three on fusion length direction, positioning
Welding can carry out in a nitrogen environment.Or use the special folder that can apply pretightning force uniform enough on weld seam overall length direction
Tight device realizes positioning.
（4）The guiding sheath weldment is preheated, preheating temperature >=15 DEG C, if environment temperature reaches 15 DEG C,
It can be without preheating.
（5）Laser welding is carried out to the abutment joint for being oriented to sheath weldment under nitrogen protection.Laser welding position is downhand welding
Or horizontal position welding, temperature≤175 DEG C between road are welded, welding laser power is 1kw ± 0.5kw, and defocusing amount is -1 to+10 mm/KW, is welded
Speed is connect as 80 ± 30mm/s, welding laser is emitted in a manner of continuous wave and multi-mode laser beam.The welding laser beam axis
It it is 90 ° ± 2 ° with weld seam angle.
The nitrogen carries out welding protection, nitrogen gas concn >=99.99% with airflow pattern, and nitrogen flow is 40 ± 10L/
min.Blow-out gas can be also set in the welding process, and the blow-out gas and weld seam angle are 50 ° ± 2 °, apart from 5 ± 2mm of weld seam.
（6）Isothermal holding 2 hours or more is carried out after the completion of welding at a temperature of 400 DEG C ± 15 DEG C.
It is surveyed using the welding method of the present invention, the fusion penetration of welding point reaches 1~1.5 mm, and tensile property is in room
When warm >=515MPa, at high temperature >=395MPa, after welding point bending, on Extrude Face, there is no have for Seam and heat effected zone
More than the cracking defect of 3mm any directions, there is no intercrystalline corrosion tendencies（Flexural center is located at the melt run of base material-weld seam）,
It is checked under 5X times of image of metallographic, flawless, lack of penetration, incomplete fusion, slag inclusion, stomata etc..It is checked under 200X times of image of metallographic,
There is no the sediments of damage test specimen performance.Gap size and aperture after welding meet design tolerance requirement.
It the above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art,
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications also should be regarded as this hair
Bright protection domain.
Claims (10)
1. guide cylinder is oriented to the method for laser welding of sheath in a kind of nuclear reactor, it is characterised in that：Include the following steps：
（1）The interface for being oriented to sheath weldment is machined out, interface machining accuracy reaches sight check zero defect, liquid
Penetrating inspection zero defect；
（2）It is clamped after being oriented to the positioning of sheath weldment root face by fixture, interface gap≤0.02mm；
（3）The tack welding fitting on fusion length direction；
（4）Laser welding is carried out to the abutment joint for being oriented to sheath weldment under nitrogen protection；
（5）Isothermal holding 2 hours or more is carried out after the completion of welding at a temperature of 400 DEG C ± 15 DEG C.
2. guide cylinder is oriented to the method for laser welding of sheath in the nuclear reactor according to claim 1, it is characterised in that：Institute
State（2）Build-up tolerance in step is controlled within 0.02mm.
3. guide cylinder is oriented to the method for laser welding of sheath in the nuclear reactor according to claim 1, it is characterised in that：Institute
State（3）It is positioned as welding positioning in step, positions position at least three in welded joints, positioning welding is laser welding, positioning
Welding carries out in a nitrogen environment.
4. guide cylinder is oriented to the method for laser welding of sheath in the nuclear reactor according to claim 1, it is characterised in that：Institute
State（3）Positioning in step is completed by clamping device, and the clamping device applies uniformly on weld seam overall length direction
Pretightning force realizes positioning.
5. guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor according to claim 1, it is characterised in that：It is described
The（4）Step further includes the step of being preheated the guiding sheath weldment, preheating temperature >=15 DEG C.
6. guide cylinder is oriented to the method for laser welding of sheath, feature in nuclear reactor according to any one of claims 1 to 5
It is：Described（4）Laser welding position in step is downhand welding or horizontal position welding, welds temperature≤175 DEG C between road, welds laser power
For 1kw ± 0.5kw, defocusing amount is -1 to+10 mm/KW, and speed of welding is 80 ± 30mm/s, and welding laser is with continuous wave and more
Mould laser beam mode emits.
7. guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor according to claim 6, it is characterised in that：It is described
It is 90 ° ± 2 ° that laser beam axis, which is welded, with weld seam angle.
8. guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor according to claim 6, it is characterised in that：It is described
Nitrogen carries out welding protection, nitrogen gas concn >=99.99% with airflow pattern, and nitrogen flow is 40 ± 10L/min.
9. guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor according to claim 6, it is characterised in that：It is welding
Blow-out gas is set in termination process, and the blow-out gas and weld seam angle are 50 ° ± 2 °, apart from workpiece surface 5mm ± 2mm.
10. guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor according to any one of claim 1 to 5,
It is characterized in that：The material for being oriented to sheath weldment is the P8 type stainless steels in 304 austenitic stainless steels or ASME standards.
Priority Applications (1)
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| CN201511013493.3A CN105382416B (en) | 2015-12-31 | 2015-12-31 | Guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201511013493.3A CN105382416B (en) | 2015-12-31 | 2015-12-31 | Guide cylinder is oriented to the method for laser welding of sheath in nuclear reactor |
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| CN105382416A CN105382416A (en) | 2016-03-09 |
| CN105382416B true CN105382416B (en) | 2018-07-03 |
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Citations (7)
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|---|---|---|---|---|
| US4546230A (en) * | 1982-01-08 | 1985-10-08 | Kawasaki Steel Corporation | Welding process using laser beam |
| EP0326994A1 (en) * | 1988-02-03 | 1989-08-09 | Thyssen Industrie Ag | Method and devices for butt welding thin plates together, especially those made of steel, by means of a powerful laser beam |
| CN201147876Y (en) * | 2008-01-25 | 2008-11-12 | 华中科技大学 | Thin wall cylinder circular seam laser beam welding jig |
| CN101966622A (en) * | 2010-04-27 | 2011-02-09 | 中国运载火箭技术研究院 | Laser welding and postweld heat treatment method for Tisub3/subAl-based alloy |
| CN102615429A (en) * | 2012-04-18 | 2012-08-01 | 深圳市恒毅兴实业有限公司 | Welding method and welding system based on welding points of disconnector of surge protector |
| CN103551750A (en) * | 2013-10-21 | 2014-02-05 | 番禺珠江钢管（珠海）有限公司 | Welded pipe and manufacturing method thereof |
| CN103753021A (en) * | 2014-01-17 | 2014-04-30 | 中国科学院半导体研究所 | Laser welding method for red copper and brass |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105149782A (en) * | 2015-10-28 | 2015-12-16 | 无锡汉神电气有限公司 | Butt joint laser welding technology for 2 mm stainless steel |
-
2015
- 2015-12-31 CN CN201511013493.3A patent/CN105382416B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546230A (en) * | 1982-01-08 | 1985-10-08 | Kawasaki Steel Corporation | Welding process using laser beam |
| EP0326994A1 (en) * | 1988-02-03 | 1989-08-09 | Thyssen Industrie Ag | Method and devices for butt welding thin plates together, especially those made of steel, by means of a powerful laser beam |
| CN201147876Y (en) * | 2008-01-25 | 2008-11-12 | 华中科技大学 | Thin wall cylinder circular seam laser beam welding jig |
| CN101966622A (en) * | 2010-04-27 | 2011-02-09 | 中国运载火箭技术研究院 | Laser welding and postweld heat treatment method for Tisub3/subAl-based alloy |
| CN102615429A (en) * | 2012-04-18 | 2012-08-01 | 深圳市恒毅兴实业有限公司 | Welding method and welding system based on welding points of disconnector of surge protector |
| CN103551750A (en) * | 2013-10-21 | 2014-02-05 | 番禺珠江钢管（珠海）有限公司 | Welded pipe and manufacturing method thereof |
| CN103753021A (en) * | 2014-01-17 | 2014-04-30 | 中国科学院半导体研究所 | Laser welding method for red copper and brass |
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| CN105382416A (en) | 2016-03-09 |
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