CN107598402A - CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure - Google Patents
CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure Download PDFInfo
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- CN107598402A CN107598402A CN201710843858.8A CN201710843858A CN107598402A CN 107598402 A CN107598402 A CN 107598402A CN 201710843858 A CN201710843858 A CN 201710843858A CN 107598402 A CN107598402 A CN 107598402A
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Abstract
The invention discloses CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure, comprise the following steps：1) seal casinghousing and vessel penetration, are subjected to assembling and spot welding, seal casinghousing connects to form sealing shell component with vessel penetration；2) the sealing shell component of a postwelding, is placed on vacuum chamber, the weld seam between seal casinghousing and vessel penetration carries out electron beam welding until welding is completed using vacuum electron beam welder.Technique of the present invention uses the vacuum electron beam welding of high-energy-density, nickel-base alloy is realized to weld with austenitic stainless steel dissimilar metal heavy wall butt weld one-shot forming, compared with original manufacture means, weldquality is stable, welding deformation is small, stock utilization is high, production efficiency is high.
Description
Technical field
The present invention relates to welding technology field, and in particular to the butt weld of CRDM dissimilar metal heavy wall is once
Forming-welding technology.
Background technology
CRDM is a kind of servo control mechanism of nuclear power plant reactor control system and safety system.Control
Rod drive mechanism, which has, to be realized reactor start-up, regulation reactor capability, maintains power, stops under reactor and accident conditions
Scram etc. acts on, and it is the important action component of nuclear reactor, and directly affects nuclear reactor normal operation and safety
One of reliable key equipment.
In three generations's nuclear power station CRDM manufacturing process, it is related to a seal casinghousing and is passed through with reactor pressure vessel
Wear the dissimilar metal butt welding of part, the weld seam be it is caused by three generations's nuclear power station CRDM Optimal Structure Designing,
It is one of key technical problems of three generations's CRDM manufacture.The weld seam is the different of nickel-base alloy and austenitic stainless steel
Kind metal docking, the reactor coolant being full of in reactor coolant loop pressure boundary, its cavity under HTHP,
It is very high to weld seam sealing and reliability requirement.The dissimilar metal butt weld of seal casinghousing and reactor pressure vessel penetration piece
For full penetration weld, welding line structure is as shown in figure 1, its thickness of pipe wall, effective fusion penetration are big (for 17.5mm).
At present, in CRDM manufacturing process, the weld seam is typically to use what manual argon arc welding was welded, base
Originally the welding of such weld seam is realized.But the welding manner of manual argon arc welding is used, welding deformation is big, to meet weld penetration
It is required that reserved processing capacity is big, pipe thickness is about 30mm, so as to cause welding loading big；Welding point bears 100 repeatedly
, there is larger welding stress in the thermal cycle effect of remaining road welding, Welded Joints quality has adverse effect；Further, since
The metallurgy characteristic of material, the defects of being also easy to produce crackle in welding process, product first-time qualification rate is low, to operating personnel's level of skill
It is required that higher, weldquality largely relies on the level of skill of welder.In view of the weld seam loading is big and welds skill set requirements
Higher, production efficiency is low, hinders efficient, high-quality batch production manufacture demand to a certain extent.
The content of the invention
It is an object of the invention to provide CRDM dissimilar metal heavy wall butt weld one-shot forming Welder
Skill, solve the problems, such as that welding difficulty is big, low production efficiency caused by existing weld seam is welded using manual argon arc welding, the present invention
The technique has the advantages of weldquality is stable, welding deformation is small, stock utilization is high.
The present invention is achieved through the following technical solutions：
CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure, comprises the following steps：
1) seal casinghousing and vessel penetration, are subjected to assembling and spot welding, seal casinghousing and vessel penetration connect
Connect to form sealing shell component；
2) the sealing shell component of a postwelding, is placed on vacuum chamber, the weldering between seal casinghousing and vessel penetration
Seam carries out electron beam welding until welding is completed using vacuum electron beam welder.
In the prior art, the welding of the seal casinghousing and vessel penetration of CRDM is typically to use
Manual argon arc welding is welded, although can substantially realize the welding of weld seam, uses the welding manner of manual argon arc welding,
It is easily caused that welding deformation is big, welding loading is big, Welded Joints quality exists in adverse effect, welding process and is also easy to produce crackle
The defects of, product first-time qualification rate it is low, to operating personnel's level of skill require higher and welding efficiency it is low the problem of.Although mesh
It is preceding also to have to laser welding technology research, intend carrying out one-shot forming butt welding using square groove, but can only disposably penetrate about
16mm, remaining about 10mm need to use welding rod to fill, and fail to reach the effect that square groove carries out a welding fabrication.And use true
Empty electron beam is controlled rod drive mechanism dissimilar metal heavy wall butt weld one-shot forming welding, and the country still belongs to blank.
In CRDM, higher, the welding procedure between different dissimilar metals is required to the welding quality of weld seam
Can not mutually cover (such as the welding procedure between nickel-base alloy and martensite cannot be used for nickel-base alloy and austenite it
Between welding).
Technique of the present invention is the requirement for the use environment of CRDM, for nickel-base alloy and Ovshinsky
The special construction of the dissimilar metal heavy wall docking formed between body stainless steel, and the welding procedure set, the welding procedure is first
Seal casinghousing is connected together with vessel penetration using spot welding, weld seam is then carried out using electron beam welding technology
Welding, this technique use the vacuum electron beam welding of high-energy-density, realize nickel-base alloy and austenitic stainless steel xenogenesis gold
Belong to heavy wall butt weld one-shot forming welding, compared with original manufacture means, weldquality is stable, welding deformation is small, material is sharp
With rate high (welding region conservation of raw material 34% or so), production efficiency, high (wall scroll weld seam welding interval foreshortened to 1 by 5~7 days
Hour or so).Nickel-base alloy and austenitic stainless steel dissimilar metal heavy wall welding fabrication of butt weld are realized, is met
Generation Ⅲ nuclear power Novel control rod drive mechanism correlation weld seam efficient stable production requirement, improve three generations's Novel control rod driving machine
Structure manufacturing technology is horizontal.
Further, spot welding described in step 1) uses manual argon arc welding, circumferential spot welding 6~10 point.
The circumferential spot welding specifically refers to circumferential uniform spot welding, and circumferential spot welding can realize that seal casinghousing and pressure vessel pass through
Wear the stability of part connector.
Further, the detailed process of electron beam welding described in step 2) is：4~5 sections of tack weldings are circumferentially first being carried out,
Penetration fustion welding is carried out again；Welding position is downhand welding, workpiece rotation, the motionless vertically lower beam of electronic torch, is welded.
Novel control rod drive mechanism nickel-base alloy and austenitic stainless steel xenogenesis gold are carried out using electro-beam welding method
Belong to the welding of heavy wall butt weld, greatly reduce weld seam entirety heat input, welding deformation is small, and stock utilization is high, weld seam
Steady quality, production efficiency are high.
Further, the qualified sealing shell component of spot welding is assembled on specific welding assambly by point postwelding, by special welding
Frock is fixed on electron-beam welder workbench, and workbench is sent into vacuum chamber.
Further, seal casinghousing inwall is equipped with substrate, and the thickness of the substrate is more than or equal to 4mm, and the substrate is convex
For the end of seal casinghousing, the substrate is removed after the completion of welding using machining.
By setting substrate, by the zone-transfer of weld seam bottom quality fluctuation caused by the beam pulse to substrate,
It is determined by experiment, the region is about that depth is about 2~3mm, reserves 1mm surpluses on this basis, fully ensures that target weld seam
The quality in region.
Further, substrate protrudes from seal casinghousing end 3-5mm.
Further, thermal weld stress is controlled with high pressure, line and speed of welding in the electron beam welding process, passed through
Focus current limits energy centralized system, by the combination of the two, reaches welding penetration and weldquality requirement.
Further, the penetration fustion welding process of electron beam welding uses time-dependent current, and starting the arc stage line rises to maximum
After 75mA, 180 ° of total power welding starting is using maximum current 75mA welding, and 181 ° of lines are gradually decrease to minimum line afterwards
70mA, receive arc stage line and drop to 0mA, speed of welding 120mm/min.
Further, before step 1), by seal casinghousing and vessel penetration welding groove region cleaning, drying；
Before step 1), the welding groove of seal casinghousing and vessel penetration is fitted together closely.
Further, after step 2), sealing shell component is removed into vacuum chamber, the surfaces externally and internally for sealing shell component is carried out
Machining, to ensure that weld seam internal-and external diameter meets design requirement.
The present invention compared with prior art, has the following advantages and advantages：
Technique of the present invention uses the vacuum electron beam welding of high-energy-density, realizes nickel-base alloy and austenite not
Steel dissimilar metal heavy wall butt weld one-shot forming of becoming rusty is welded, and compared with original manufacture means, weldquality is stable, welding deformation
Small, stock utilization high (welding region conservation of raw material 34% or so), production efficiency are high, and (welding interval was foreshortened to by 5~7 days
1 hour or so).Nickel-base alloy and austenitic stainless steel dissimilar metal heavy wall welding fabrication of butt weld are realized, is met
Generation Ⅲ nuclear power Novel control rod drive mechanism correlation weld seam efficient stable production requirement, improve the driving of three generations's Novel control rod
Mechanism manufacturing technology is horizontal.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is seal casinghousing and penetration piece welding line structure schematic diagram；
Fig. 2 is provided with the welding line structure schematic diagram of substrate；
Fig. 3 is change curve of the electron beam line with number of rotation.
Mark and corresponding parts title in accompanying drawing：
1- seal casinghousings, 2- vessel penetrations, 3- weld seams, 4- substrates.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1：
As shown in Figure 1 to Figure 3, CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure, bag
Include following steps：
1) seal casinghousing 1 and vessel penetration 2, are subjected to assembling and spot welding, seal casinghousing 1 and vessel penetration
2 connections form sealing shell component, and the spot welding uses manual argon arc welding, circumferential spot welding 6~10 point；
2), the qualified sealing shell component of spot welding is assembled on specific welding assambly by point postwelding, and specific welding assambly is consolidated
It is scheduled on electron-beam welder workbench, workbench is sent into vacuum chamber, in a vacuum chamber, seal casinghousing 1 and pressure vessel
Weld seam 3 between penetration piece 2 carries out electron beam welding until welding completion, the electron beam welding using vacuum electron beam welder
Detailed process be：4~5 sections of tack weldings are circumferentially first being carried out, then are carrying out penetration fustion welding；Welding position is downhand welding, workpiece rotation,
The motionless vertically lower beam of electronic torch, is welded, is controlled and welded with high pressure, line and speed of welding in the electron beam welding process
Heat input is connect, energy centralized system is limited by focus current, by the combination of the two, reaches welding penetration and closes quality requirement,
After the penetration fustion welding process of the electron beam welding uses time-dependent current, starting the arc stage line to rise to maximum 75mA, total power
180 ° of welding starting is welded using maximum current 75mA, and 181 ° of lines are gradually decrease to minimum line 70mA afterwards, receives the arc stage
Line drops to 0mA, speed of welding 120mm/min；
Before step 1), by seal casinghousing 1 and the welding groove region cleaning, drying of vessel penetration 2；In step
1) before, the welding groove of seal casinghousing 1 and vessel penetration 2 is fitted together closely, after step 2), will be sealed
Shell component removes vacuum chamber, and the surfaces externally and internally for sealing shell component is machined out, to ensure that the internal-and external diameter of weld seam 3 meets that design will
Ask.
Weld seam 3 using the seal casinghousing 1 that technique described in the present embodiment is welded and vessel penetration 2 reaches such as table 2
Shown performance indications：
The performance indications of the weld seam 3 of table 2
Embodiment 2：
As shown in Figure 1 to Figure 3, the present embodiment is based on embodiment 1, and the inwall of seal casinghousing 1 is equipped with substrate 4, described
The thickness of substrate 4 is more than or equal to 4mm, and the substrate 4 protrudes from the end of seal casinghousing 1, and the substrate 4 is adopted after the completion of welding
Removed with machining；The substrate 4 protrudes from the end 3-5mm of seal casinghousing 1.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (10)
1. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure, it is characterised in that including following
Step：
1) seal casinghousing (1) and vessel penetration (2), are subjected to assembling and spot welding, seal casinghousing (1) and pressure vessel run through
Part (2) connection forms sealing shell component；
2) the sealing shell component of a postwelding, is placed on vacuum chamber, between seal casinghousing (1) and vessel penetration (2)
Weld seam (3) carries out electron beam welding until welding is completed using vacuum electron beam welder.
2. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, spot welding described in step 1) uses manual argon arc welding, circumferential spot welding 6~10 point.
3. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, the detailed process of electron beam welding described in step 2) is：4~5 sections of tack weldings are circumferentially first being carried out, then are being carried out
Penetration fustion welding；Welding position is downhand welding, workpiece rotation, the motionless vertically lower beam of electronic torch, is welded.
4. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, the qualified sealing shell component of spot welding is assembled on specific welding assambly by point postwelding, specific welding assambly is consolidated
It is scheduled on electron-beam welder workbench, workbench is sent into vacuum chamber.
5. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, seal casinghousing (1) inwall is equipped with substrate (4), the thickness of the substrate (4) is more than or equal to 4mm, described
Substrate (4) protrudes from the end of seal casinghousing (1), and the substrate (4) is removed after the completion of welding using machining.
6. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 5,
Characterized in that, the substrate (4) protrudes from seal casinghousing (1) end 3-5mm.
7. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, thermal weld stress is controlled with high pressure, line and speed of welding in the electron beam welding process, by focusing on electricity
Current limit energy centralized system, by the combination of the two, reach welding penetration and weldquality requirement.
8. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, the penetration fustion welding process of the electron beam welding uses time-dependent current, starting the arc stage line rises to maximum
After 75mA, 180 ° of total power welding starting is using maximum current 75mA welding, and 181 ° of lines are gradually decrease to minimum line afterwards
70mA, receive arc stage line and drop to 0mA, speed of welding 120mm/min.
9. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, before step 1), by seal casinghousing (1) and vessel penetration (2) welding groove region cleaning, drying,
Before step 1), the welding groove of seal casinghousing (1) and vessel penetration (2) is fitted together closely.
10. CRDM dissimilar metal heavy wall butt weld one-shot forming welding procedure according to claim 1,
Characterized in that, after step 2), sealing shell component is removed into vacuum chamber, carrying out machine to the surfaces externally and internally for sealing shell component adds
Work, to ensure that weld seam (3) internal-and external diameter meets design requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710843858.8A CN107598402B (en) | 2017-09-19 | 2017-09-19 | One-step forming welding process for dissimilar metal thick-wall butt welding seam of control rod driving mechanism |
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| CN201710843858.8A CN107598402B (en) | 2017-09-19 | 2017-09-19 | One-step forming welding process for dissimilar metal thick-wall butt welding seam of control rod driving mechanism |
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| CN109093270A (en) * | 2018-11-05 | 2018-12-28 | 北京星航机电装备有限公司 | A kind of large size metal plate weldering cabin lid form fabrication device and method |
| CN110936013A (en) * | 2018-09-21 | 2020-03-31 | 大族激光科技产业集团股份有限公司 | Sealing method and sealing body of kovar alloy and dissimilar metal |
| CN112171044A (en) * | 2019-07-01 | 2021-01-05 | 上海第一机床厂有限公司 | Welding method for upper guide cylinder assembly of nuclear reactor |
| CN112872637A (en) * | 2020-12-28 | 2021-06-01 | 中国原子能科学研究院 | Device and method for welding sealing cylinder of driving motor |
| CN114200504A (en) * | 2021-12-13 | 2022-03-18 | 中国核动力研究设计院 | Electron beam generator for simulating beta radiation source and testing method |
| CN114200504B (en) * | 2021-12-13 | 2024-04-30 | 中国核动力研究设计院 | Electron beam generator for simulating beta radiation source and testing method |
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| CN112872637A (en) * | 2020-12-28 | 2021-06-01 | 中国原子能科学研究院 | Device and method for welding sealing cylinder of driving motor |
| CN112872637B (en) * | 2020-12-28 | 2022-03-11 | 中国原子能科学研究院 | Device and method for welding sealing cylinder of driving motor |
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| CN114200504B (en) * | 2021-12-13 | 2024-04-30 | 中国核动力研究设计院 | Electron beam generator for simulating beta radiation source and testing method |
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