CN105345262A - Laser welding method of guide cylinder semi-casing in nuclear reactor - Google Patents
Laser welding method of guide cylinder semi-casing in nuclear reactor Download PDFInfo
- Publication number
- CN105345262A CN105345262A CN201511013491.4A CN201511013491A CN105345262A CN 105345262 A CN105345262 A CN 105345262A CN 201511013491 A CN201511013491 A CN 201511013491A CN 105345262 A CN105345262 A CN 105345262A
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- Prior art keywords
- welding
- laser
- guide cylinder
- nuclear reactor
- laser welding
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
-
- 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
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- 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
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention belongs to the technical field of welding and discloses a laser welding method of a guide cylinder semi-casing in a nuclear reactor. The laser welding method comprises steps as follows: (1), a butt joint surface of a semi-casing weld assembly is machined, and the machining precision of the butt joint surface is defect-free through visual inspection and is defect-free through liquid penetration test; (2), a truncated edge of the semi-casing weld assembly is positioned and then tightly clamped by a fixture, and a butt joint surface gap is smaller than or equal to 0.02 mm; (3), the weld assembly is positioned in the weld length direction; (4), a butt joint seam of the semi-casing weld assembly is subjected to laser welding under the protection of nitrogen; (5), the thermal insulation processing is performed for more than 2 h at the temperature of 400 DEG C plus or minus 15 DEG C after welding. The welding process is simple, the welding speed is high, the weld forming is good, the physical and chemical properties are good, the deformation is controllable, and the working environment is safe.
Description
Technical field
The invention belongs to welding technology field, particularly the method for laser welding of guide cylinder half housing in a kind of nuclear reactor.
Background technology
Guide assembly is very important parts in presurized water reactor 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 1 cover half case weld part (or claiming " half square tube assembly "), comprise 69 cover half case weld parts in each unit.More in the pressurized water reactor type of 1400MW, be 89 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, need after assembly station completes assembling, move into vacuum chamber, this process need change frock, then carries 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 recovering normal pressure.Add the operations such as frock is changed, vacuum chamber assembles, vacuumizes, inflation, the time of this few step action need is several times even ten several times of weld interval, for the welding of half housing unit of enormous amount, and inefficiency.And 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 guide cylinder half housing in a kind of nuclear reactor, realize the laser weld under non-vacuum environment, welding process is simple to operate, and excellent, the physicochemical property of being shaped is 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 half housing, is characterized in that, comprise the steps:
The interface of (1) double case weld part carries out machined, and interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect;
(2) clamped behind half case weld part root face location by fixture, interface gap≤0.02mm;
(3) tack welding fitting on fusion length direction;
(4) abutment joint of double case weld part carries out laser weld under nitrogen protection;
(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 laser weld location in described (3) step as, positioning welding carries out in a nitrogen environment.
Further, be located through that clamping device completes in described (3) step, 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 half case weld part 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 6kw ± 0.5kw, defocusing amount is-2mm to+10mm, and speed of welding is 70mm/s ± 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 weld seam 5 ± 2mm.
Further, the material of described half case weld part is the similar stainless steel of P8 of 304 austenitic stainless steels or ASME standard, and the docking section of described half case weld part is L-type.
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 the case weld part of L-type docking;
Accompanying drawing 2 is structure cross-sectional schematic of half case weld part of flat mouth docking;
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 half housing 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, is arranged in upper-part in-reactor component, play the guiding role to control rod, and the accuracy of manufacture requires high, and material is core level 304 type austenitic stainless steel, is very suitable for the advantage playing Laser Welding.
See accompanying drawing 1, the interface of half housing is all arranged on L-type docking section, when two docking sections engage, forms three weld seams.
See accompanying drawing 2, the interface of half housing is plane, when two docking sections engage, forms a weld seam.
Welding technique of the present invention can be used for CAP1400, AP1000, No. Hua Longyi, the welding manufacture of guide cylinder half housing of the model unit such as M310, all or part of replacement half housing 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:
The interface of (1) double case weld part carries out machined, and interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect, half housing weldment square groove, and directly achieve a butt joint interface weldering.
(2) clamped behind half case weld part root face location by fixture, interface gap≤0.02mm, build-up tolerance controls within 0.02mm.
(3) at least three positions, place, positioning welding location on fusion length direction, positioning welding is also laser weld, and positioning welding can carry out in a nitrogen environment.Also the special clamping device that can apply enough evenly pretightning force on weld seam overall length direction can be used to realize location.
(4) described half case weld part is carried out preheating, preheat temperature >=15 DEG C, if environment temperature reaches 15 DEG C, also can not carry out preheating.
(5) abutment joint of double case weld part carries out laser weld under nitrogen protection.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 more than 4mm, tensile property when room temperature >=515MPa, 350 DEG C time >=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. the method for laser welding of guide cylinder half housing in nuclear reactor, is characterized in that: comprise the steps:
The interface of (1) double case weld part carries out machined, and interface machining accuracy reaches sight check zero defect, liquid penetration test zero defect;
(2) clamped behind half case weld part root face location by fixture, interface gap≤0.02mm;
(3) tack welding fitting on fusion length direction;
(4) abutment joint of double case weld part carries out laser weld under nitrogen protection;
(5) at the temperature of 400 DEG C ± 15 DEG C, isothermal holding is carried out more than 2 hours after having welded.
2. the method for laser welding of guide cylinder half housing in nuclear reactor according to claim 1, is characterized in that: the build-up tolerance in described (2) controls within 0.02mm.
3. the method for laser welding of guide cylinder half housing in nuclear reactor according to claim 1, is characterized in that: orientate laser weld location in described (3) step as, positioning welding carries out in a nitrogen environment.
4. the method for laser welding of guide cylinder half housing in nuclear reactor according to claim 1, it is characterized in that: be located through in described (3) step that clamping device completes, described clamping device applies even pretightning force and realizes location on weld seam overall length direction.
5. the method for laser welding of guide cylinder half housing in nuclear reactor according to claim 1, is characterized in that: described (4) step also comprises the step of described half case weld part being carried out preheating, preheat temperature >=15 DEG C.
6. the method for laser welding of guide cylinder half housing 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 6kw ± 0.5kw, defocusing amount is-2mm to+10mm, speed of welding is 70mm/s ± 30mm/s, and welding laser is launched with continuous wave and multi-mode laser bundle mode.
7. the method for laser welding of guide cylinder half housing in nuclear reactor according to claim 6, is characterized in that: described welding laser beam axis and weld seam angle are 90 ° ± 2 °.
8. the method for laser welding of guide cylinder half housing in nuclear reactor according to claim 6, 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 half housing 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 °, distance weld seam 5 ± 2mm.
10. the method for laser welding of guide cylinder half housing in nuclear reactor according to any one of claim 1 to 5, it is characterized in that: the material of described half case weld part is the similar stainless steel of P8 of 304 austenitic stainless steels or ASME standard, and the docking section of described half case weld part is L-type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511013491.4A CN105345262A (en) | 2015-12-31 | 2015-12-31 | Laser welding method of guide cylinder semi-casing in nuclear reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511013491.4A CN105345262A (en) | 2015-12-31 | 2015-12-31 | Laser welding method of guide cylinder semi-casing in nuclear reactor |
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| CN105345262A true CN105345262A (en) | 2016-02-24 |
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| CN201511013491.4A Pending CN105345262A (en) | 2015-12-31 | 2015-12-31 | Laser welding method of guide cylinder semi-casing in nuclear reactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109590608A (en) * | 2019-01-15 | 2019-04-09 | 沧州宏涛智能设备有限公司 | One kind connects to integral type welding penetration welding method and device |
| CN110340528A (en) * | 2019-07-16 | 2019-10-18 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil rocket shell |
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| CN104043901A (en) * | 2014-06-19 | 2014-09-17 | 华侨大学 | Stainless steel water faucet shell welding technology |
| 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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Patent Citations (9)
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| CN201147876Y (en) * | 2008-01-25 | 2008-11-12 | 华中科技大学 | Thin wall cylinder circular seam laser beam welding jig |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109590608A (en) * | 2019-01-15 | 2019-04-09 | 沧州宏涛智能设备有限公司 | One kind connects to integral type welding penetration welding method and device |
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| CN110340528A (en) * | 2019-07-16 | 2019-10-18 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil rocket shell |
| CN110340528B (en) * | 2019-07-16 | 2021-07-06 | 湖北三江航天江北机械工程有限公司 | Welding method for airborne small rocket shell |
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Application publication date: 20160224 |