CN105382416A - Laser welding method of guide sheaths of guide cylinder in nuclear reactor - Google Patents
Laser welding method of guide sheaths of guide cylinder in nuclear reactor Download PDFInfo
- Publication number
- CN105382416A CN105382416A CN201511013493.3A CN201511013493A CN105382416A CN 105382416 A CN105382416 A CN 105382416A CN 201511013493 A CN201511013493 A CN 201511013493A CN 105382416 A CN105382416 A CN 105382416A
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- China
- Prior art keywords
- welding
- laser
- guiding sheath
- nuclear reactor
- guide cylinder
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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
Abstract
The invention belongs to the technical field of welding, and discloses a laser welding method of guide sheaths of a guide cylinder in a nuclear reactor. The laser welding method comprises the following steps: (1) machining butt planes of guide sheath weld assemblies until the machining precision of the butt planes reaches the degree of zero defect by visual inspection and a liquid penetration test; (2) positioning and then clamping truncated edges of the guide sheath weld assemblies through a clamp, wherein the gap between the butt planes is less than or equal to 0.02mm; (3) positioning the weld assemblies in the length direction of a welding line; (4) under the protection of nitrogen, performing laser welding on a butt joint of the guide sheath weld assemblies; (5) after the welding, performing insulation treatment at the temperature of 400+/-15 DEG C for not less than 2 hours. According to the laser welding method provided by the invention, the welding process is simple, the welding speed is fast, the welding formation is excellent, the physical and chemical properties are excellent, the deformation is controllable, and the working environment is safe.
Description
Technical field
The invention belongs to welding technology field, particularly in a kind of nuclear reactor guide cylinder guiding sheath method for laser welding.
Background technology
Guide assembly is very important parts in pressure water reactor of nuclear reaction in-pile component, and its accuracy of manufacture requires high, harsh to the control overflow of welding deformation.In 1000MW presurized water reactor, guide cylinder quantity is generally 69 covers, often overlaps in guide cylinder and includes 8 cover guiding sheath assemblies (or claiming " twin-tube assembly ", 4 cover 45 ° of guiding sheaths and 4 covers, 90 ° of guiding sheaths), comprise 552 cover guiding sheath assemblies in each unit.More in the pressurized water reactor type of 1400MW, be 712 covers.
Existing welding method is by vacuum electron beam welding, and because its material is austenitic stainless steel, electron beam welding under vacuum, can realize high weldering speed, low heat input, free of contamination welding.Welding deformation is little, and appearance of weld is good.
But existing vacuum electron beam welding method, needs after assembly station completes assembling, move into vacuum chamber, then carry out vacuum pumping, vacuum can welding after reaching high requirement, postwelding, need carry out charge operation, can take out weldment and carry out subsequent survey and processing after replying normal pressure.The operating procedures such as vacuum chamber assembles, vacuumize, inflation are complicated, and the time of needs is several times even ten several times of weld interval, for the welding of the guiding sheath assembly of enormous amount, and inefficiency.In addition, vacuum electron beam welding must increase X-ray protection, has potential safety hazard.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides the method for laser welding of the guiding of guide cylinder in a kind of nuclear reactor sheath, realize the laser weld under non-vacuum environment, welding process is simple to operate, be shaped excellent, physicochemical property good, is out of shape controlled.
The technical scheme that the present invention takes is:
In nuclear reactor, a method for laser welding for guide cylinder guiding sheath, is characterized in that, comprise the steps:
(1) carry out machined to the interface of guiding sheath weldment, interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect;
(2) by fixture will lead sheath weldment root face location after clamping, interface gap≤0.02mm;
(3) tack welding fitting on fusion length direction;
(4) under nitrogen protection laser weld is carried out to the abutment joint of guiding sheath weldment;
(5) at the temperature of 400 DEG C ± 15 DEG C, isothermal holding is carried out more than 2 hours after having welded.
Further, the build-up tolerance in described (2) controls within 0.02mm.
Further, orientate welding location in described (3) step as, locate at least three positions, place in welded joints, positioning welding is laser weld, and positioning welding carries out in a nitrogen environment.
Further: the middle location of described (3) step is completed by clamping device, and described clamping device applies even pretightning force and realizes location on weld seam overall length direction.
Further, described (4) step also comprises the step of described guiding sheath weldment being carried out preheating, preheat temperature >=15 DEG C.
Further, the laser weld position in described (4) step is downhand welding or horizontal position welding, temperature≤175 DEG C between welding road, welding laser power is 1kw ± 0.5kw, defocusing amount is-1 to+10mm/KW, and speed of welding is 80 ± 30mm/s, and welding laser is launched with continuous wave and multi-mode laser bundle mode.
Further, described welding laser beam axis and weld seam angle are 90 ° ± 2 °.
Further, described nitrogen carries out welding protection with airflow pattern, nitrogen gas concn >=99.99%, and nitrogen flow is 40 ± 10L/min.
Further, in welding process, arrange blow-out gas, described blow-out gas and weld seam angle are 50 ° ± 2 °, distance surface of the work 5mm ± 2mm.
Further, the material of described guiding sheath weldment is the P8 type stainless steel in 304 austenitic stainless steels or ASME standard.
The invention has the beneficial effects as follows:
(1) welding process is simple, and speed of welding is fast;
(2) welding forming is excellent, physicochemical property is good, is out of shape controlled;
(3) work circumstances safe.
Accompanying drawing explanation
Accompanying drawing 1 is the structure cross-sectional schematic of 90 ° of guiding sheath weldments;
Accompanying drawing 2 is structure cross-sectional schematic of 45 ° of guiding sheath weldments;
Accompanying drawing 3 is method flow diagrams of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the method for laser welding of guide cylinder guiding sheath in nuclear reactor of the present invention is elaborated.
Laser Welding is a kind of high energy beam welding method; compared to welding methods such as traditional SMAW (SMAW), non-consumable gas shielded arc weldings (GTAW); heat-source energy density is large, speed of welding is high, low, the welding seam deep width ratio of heat input is large, and seam organization even compact, joint performance are excellent and be easy to control welding deformation amount and the welding deformation uniformity.Guide cylinder is the vitals in presurized water reactor in-pile component, be arranged in upper-part in-reactor component, play the guiding role to control rod, the accuracy of manufacture requires high, and material is stainless steel of the same type in core level 304 type austenitic stainless steel or ASMEP8, be very suitable for the advantage playing Laser Welding.
See accompanying drawing 1,2,45 ° of guiding sheaths and 90 ° of guiding sheath weldment welding form guide cylinder guiding sheath in nuclear reactor, and welding penetration wants ﹥ 0.8mm, and size will reach to designing requirement.
Welding technique of the present invention can be used for CAP1400, AP1000, No. Hua Longyi, the welding manufacture of the guide cylinder guiding sheath of the model unit such as M310, all or part of replacement guiding sheath vacuum electron beam welding technique.What Laser Welding did not need vacuum electron beam vacuumizes deflation course, and without X-ray Radiation risk, possesses inherent advantage, and welding efficiency can reach 2 ~ 4 times of vacuum electron beam welding, even; Separately, relative to electron-bombardment welding, laser welding process allows directly to weld after completing assembling, without the need to changing welding tooling, decreasing the front operating procedure of weldering and time, playing and improving guide cylinder manufacture efficiency, shortening the effect of manufacturing cycle.
See accompanying drawing 3, welding method of the present invention is as follows:
(1) carry out machined to the interface of guiding sheath weldment, interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect, and guiding sheath weldment square groove, directly achieve a butt joint interface weldering.
(2) by fixture will lead sheath weldment root face location after clamping, interface gap≤0.02mm, build-up tolerance controls within 0.02mm.
(3) on fusion length direction, positioning welding location at least three position, place positioning weldings are also laser weld, and positioning welding can carry out in a nitrogen environment.Or use the special clamping device that can apply enough evenly pretightning force on weld seam overall length direction to realize location.
(4) described guiding sheath weldment is carried out preheating, preheat temperature >=15 DEG C, if environment temperature reaches 15 DEG C, also can not carry out preheating.
(5) under nitrogen protection laser weld is carried out to the abutment joint of guiding sheath weldment.Laser weld position is downhand welding or horizontal position welding, temperature≤175 DEG C between welding road, and welding laser power is 1kw ± 0.5kw, and defocusing amount is-1 to+10mm/KW, and speed of welding is 80 ± 30mm/s, and welding laser is launched with continuous wave and multi-mode laser bundle mode.Described welding laser beam axis and weld seam angle are 90 ° ± 2 °.
Described nitrogen carries out welding protection with airflow pattern, nitrogen gas concn >=99.99%, and nitrogen flow is 40 ± 10L/min.In welding process, also can arrange blow-out gas, described blow-out gas and weld seam angle are 50 ° ± 2 °, distance weld seam 5 ± 2mm.
(6) at the temperature of 400 DEG C ± 15 DEG C, isothermal holding is carried out more than 2 hours after having welded.
Welding method of the present invention is utilized to survey, the fusion penetration of welding point reaches 1 ~ 1.5mm, tensile property when room temperature >=515MPa, when high temperature >=395MPa, after welding point is bending, on Extrude Face, Seam and heat effected zone does not have the cracking defect more than any direction of 3mm, there is not intercrystalline corrosion tendency (flexural center is positioned at the melt run of mother metal-weld seam), check under metallographic 5X times image, flawless, lack of penetration, incomplete fusion, slag inclusion, pore etc.Under metallographic 200X times image, check there is not the sediment of infringement test specimen performance.Gap size after welding and aperture meet design tolerance requirement.
Below be only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. in nuclear reactor guide cylinder guiding sheath a method for laser welding, it is characterized in that: comprise the steps:
(1) carry out machined to the interface of guiding sheath weldment, interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect;
(2) by fixture will lead sheath weldment root face location after clamping, interface gap≤0.02mm;
(3) tack welding fitting on fusion length direction;
(4) under nitrogen protection laser weld is carried out to the abutment joint of guiding sheath weldment;
(5) at the temperature of 400 DEG C ± 15 DEG C, isothermal holding is carried out more than 2 hours after having welded.
2. in nuclear reactor according to claim 1 guide cylinder guiding sheath method for laser welding, it is characterized in that: the build-up tolerance in described (2) controls within 0.02mm.
3. in nuclear reactor according to claim 1 guide cylinder guiding sheath method for laser welding, it is characterized in that: in described (3) step, orientate welding location as, locate at least three positions, place in welded joints, positioning welding is laser weld, and positioning welding carries out in a nitrogen environment.
4. in nuclear reactor according to claim 1 guide cylinder guiding sheath method for laser welding, it is characterized in that: the middle location of described (3) step is completed by clamping device, described clamping device applies even pretightning force and realizes location on weld seam overall length direction.
5. in nuclear reactor according to claim 1 guide cylinder guiding sheath method for laser welding, it is characterized in that: described (4) step also comprises the step of described guiding sheath weldment being carried out preheating, preheat temperature >=15 DEG C.
6. the method for laser welding of guide cylinder guiding sheath in the nuclear reactor according to any one of claim 1 to 5, it is characterized in that: the laser weld position in described (4) step is downhand welding or horizontal position welding, temperature≤175 DEG C between welding road, welding laser power is 1kw ± 0.5kw, defocusing amount is-1 to+10mm/KW, speed of welding is 80 ± 30mm/s, and welding laser is launched with continuous wave and multi-mode laser bundle mode.
7. in nuclear reactor according to claim 6 guide cylinder guiding sheath method for laser welding, it is characterized in that: described welding laser beam axis and weld seam angle are 90 ° ± 2 °.
8. in nuclear reactor according to claim 6 guide cylinder guiding sheath method for laser welding, it is characterized in that: described nitrogen carries out welding protection with airflow pattern, nitrogen gas concn >=99.99%, nitrogen flow is 40 ± 10L/min.
9. the method for laser welding of guide cylinder guiding sheath in nuclear reactor according to claim 6, it is characterized in that: in welding process, arrange blow-out gas, described blow-out gas and weld seam angle are 50 ° ± 2 °, apart from surface of the work 5mm ± 2mm.
10. the method for laser welding of guide cylinder guiding sheath in nuclear reactor according to any one of claim 1 to 5, is characterized in that: the material of described guiding sheath weldment is the P8 type stainless steel in 304 austenitic stainless steels or ASME standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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 true CN105382416A (en) | 2016-03-09 |
| CN105382416B CN105382416B (en) | 2018-07-03 |
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Citations (8)
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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 |
| 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 (8)
| 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 |
| 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 |
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| CN105382416B (en) | 2018-07-03 |
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