CN110293280A - It is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means - Google Patents
It is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means Download PDFInfo
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- CN110293280A CN110293280A CN201810244192.9A CN201810244192A CN110293280A CN 110293280 A CN110293280 A CN 110293280A CN 201810244192 A CN201810244192 A CN 201810244192A CN 110293280 A CN110293280 A CN 110293280A
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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
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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
- B23K9/32—Accessories
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- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to welding procedures and welding technology field, and in particular to one kind is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means, specifically includes the following steps: step 1: components preparation；Step 2: equipment is connect using argonaut welding and carries out the evaluation of CRDM Ω sealing structure bead-welding technology；Welding condition, thermal weld stress Q is between 9030~10710J/cm；Step 3: respectively according to RCC-M standard and ASME standard, non-destructive testings and the destructive tests of metallographic, chemical composition analysis such as size, visual, Liquid Penetrant are carried out to procedure qualification test specimen.Welding technique of the present invention is argonaut welding, and welding current just connects, and current type is pulse, it is ensured that postwelding is without DDC crackle；And built-up welding repair quality can be effectively improved, it is a kind of control technology that can effectively prevent Nickel-based Alloy Welding and generate DDC crackle in the process.
Description
Technical field
The invention belongs to welding procedures and welding technology field, and in particular to one kind is related to driving mechanism Ω seal-weld nickel
Based alloy built-up welding DDC crack controlling means.
Background technique
Control rod drive mechanism (CRDM) is one of the key equipment in Power Station With The Pressurized Water Reactor operational process, CRDM's
Ω seal-weld is inexorable trend and most common failure as incident of leakage occurs in the extension of unit runing time, in the world with core
Repeatedly feed back the incident of leakage in power station.For this problem, American engineer has made a kind of surfacing equipment the nineties in 19th century
With the invention of technology, it is intended to by being Ni-based conjunction according to certain welding conditions and throat thickness built-up welding 690 on former omega welding seam
Gold can set up new encapsulation boundary under conditions of exempting to the operation such as polishing, repair welding of former weld seam, meanwhile, make
The drawing stress on surface of former weld seam is converted into compression, achievees the effect that crack arrest and pre- Anti-cracking are extended.For welding seam failure
Reason, what built-up welding had selected anti-SCC ability excellent 690 is nickel-base alloy as deposited metal, but nickel-base alloy but has it
Inherent shortcoming: to ductility dip cracking (DDC) sensitivity, it is easy to produce DDC crackle, this almost becomes Ni-based conjunction in world wide
The difficult point of golden technique for overlaying.
For many years, worldwide result of study shows that the factor for influencing nickel-base alloy DDC specifically includes that (1) is Ni-based
Composition (2) welding condition of alloy composition.Adjustment for nickel-base alloy chemical component improves, multinomial in the world to grind
Study carefully and be dedicated to this, develop a large amount of New Nickel-Based Alloy wlding, its DDC cracking trend is effectively relieved, for example, the world ASME is marked
In standard, ERNiCrFe-7A nickel-base alloy bare welding filler metal is the upgrading material of ERNiCrFe-7, mainly keeps its resistant to high temperatures by the addition of Nb
Ductility-dip crack (DDC) performance greatly improves, to promote the yield rate of weldment；Degree of purity by improving material promotes wlding
Stability.Adjustment for welding condition improves, then mostly is " teaching students in accordance with their aptitude ", uses the big weldering of low current in principle
Fast [1] reduces heat input, controls growing up for crystal grain, it is possible to reduce DDC tendency, however the technique of every kind of specific structure, material is joined
Number is all different, ununified data standard；Or it takes supplement heat rejecter, accelerate cooling velocity, or use high heat source (such as laser
Beam and electron beam etc.) nickel-base alloy is welded, growing up for crystal grain is controlled, DDC tendency is reduced.
Current result of study shows that welding condition is to influence the key factor of nickel-base alloy DDC crackle in the world
One of, but for the work that the DDC crackle of this special construction special process of CRDM Ω seal-weld nickel alloy cladding controls
Process, there has been no document reports.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind to be related to driving mechanism Ω seal-weld nickel alloy cladding DDC
Crack controlling means, the control method pass through the technological parameters such as setting welding current, weldingvoltage and speed of welding, control welding
Heat input realizes that nuclear power plant's control rod drive mechanism Ω sealing structure nickel-base alloy automatic surfacing is generated without DDC crackle, to reach
To the purpose for guaranteeing weld seam welding quality.
The technical scheme is that
One kind being related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means, it is characterised in that: specific
The following steps are included:
Step 1: components preparation；
Step 2: equipment is connect using argonaut welding and carries out the evaluation of control rod drive mechanism Ω sealing structure bead-welding technology；
Step 3: respectively according to RCC-M standard and ASME standard, size is carried out to procedure qualification test specimen, visual, liquid seeps
Non-destructive testings and the destructive test of metallographic, chemical composition analysis are waited thoroughly.
In above-mentioned steps one, driving mechanism Ω sealing structure upper end plugs (1) and lower part driving throw of lever casing (3) are used
The processing of 00Cr18Ni10N bar, obtains Ω seal-weld (2) using ER316L welding wire sealing welding.
Welding condition is arranged in above-mentioned steps two: thermal weld stress Q is between 9030~10710J/cm.
Welding gun protective gas in above-mentioned steps two: argon gas >=99.99%.
Welding technology uses in above-mentioned steps two: not swinging, monofilament weldering, multi-pass welding.
Built-up welding maintenance process evaluates technological parameter in above-mentioned steps two are as follows:
。
Aforementioned present invention is suitable for the nickel alloy cladding of nuclear power plant's control rod drive mechanism Ω seal-weld.
The beneficial technical effect of the present invention lies in: the nickel alloy cladding DDC crack controlling means success that the present invention designs
Nuclear power plant's control rod drive mechanism Ω seal-weld nickel-base alloy automatic surfacing is realized, welding technique of the present invention is automatic argon arc
Weldering, welding current just connect, and current type is pulse, it is ensured that postwelding is without DDC crackle；The present invention is clear for object, technique side
Method is easy to accomplish and control, can effectively improve built-up welding repair quality, be during one kind can effectively prevent Nickel-based Alloy Welding
Generate the control technology of DDC crackle.
Detailed description of the invention
Fig. 1 be the present invention design be related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means
Control rod drive mechanism (CRDM) Ω sealed structural schematic diagram；
Fig. 2 be the present invention design be related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means
Overlay cladding metallographic testing result figure.
In figure, 1- end plug, 2- Ω seal-weld, 3- drive throw of lever casing.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples.
DDC crackle is a kind of solid-state crackle, often comes across nickel-base alloy, austenitic stainless steel, acid bronze alloy and titanium alloy
In equal materials.The plasticity of common metal is increased with the raising of temperature, and when fusing point of the temperature close to material, the plasticity of metal is
It can occur sharply to decline；But for above-mentioned several alloys, when temperature reaches the 0.5~0.8 of fusing point, their plasticity also can
There is a region sharply declined, this region is exactly the region (DTR) that DDC crackle occurs.Wherein, Emin is DTR temperature
Occurs the minimum critical strain value of DDC in section, the size of DTR temperature range and the size of Emin, which can be used as, differentiates that DDC is quick
The index of perception.
One kind that the present invention designs is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means, tool
Body the following steps are included:
Step 1: components preparation；Nuclear power plant's control rod drive mechanism (CRDM) Ω sealing structure is as shown in Figure 1, top
End plug 1 and lower part driving throw of lever casing 3 are processed using 00Cr18Ni10N bar, are obtained using ER316L welding wire sealing welding
Ω seal-weld 2；
Step 2: equipment is connect using argonaut welding and carries out the evaluation of CRDM Ω sealing structure bead-welding technology；Welding gun protects gas
Body: argon gas >=99.99%；Welding technology: it does not swing, monofilament weldering, multi-pass welding；Middle welding procedure is connect according to automatic tungsten anode argon arc welding
Parameter area requirement, is arranged welding condition, guarantees thermal weld stress Q between 9030~10710J/cm；Used here as such as
Welding condition described in following table carries out qualification of welding procedure；
1 built-up welding maintenance process of table evaluates technological parameter
Step 3: respectively according to RCC-M standard and ASME standard, size is carried out to procedure qualification test specimen, visual, liquid seeps
The destructive tests such as non-destructive testings and metallographic, chemical composition analysis are waited thoroughly.Every testing result meets the technical requirements.
Wherein, metallographic testing result in overlay cladding deposited metal as shown in Fig. 2, do not find DDC crackle.
Present invention is alternatively directed to control rod drive mechanism (CRDM) Ω sealing structure ERNiCrFe-7A nickel alloy claddings to repair
It is multiple, carry out the key factor research for influencing DDC sensibility.Devise welding peak point current and speed of welding size parameter into
Then row Orthogonal Composite Welding experiment carries out the metal lographic examination of overlay cladding and fusion area, as a result such as the following table 1.
Ω seal-weld bead weld specimen metal lographic examination result under the different welding conditions of table 2
Note: thermal weld stress
Experimental study shows for control rod drive mechanism (CRDM) Ω sealing structure nickel alloy cladding reparation, welding
Heat input is to influence the key factor of nickel-base alloy weld seam DDC sensibility.
Based on test serial number S01 welding condition, keep other technological parameters constant, devising peak point current is respectively
145A (Q=9030J/cm), 185A (Q=10710J/cm) size parameter Welding experiment, postwelding metal lographic examination are showed no defect.
Comprehensive analysis test result guarantees that thermal weld stress Q between 9030~10710J/cm, can be effectively relieved in this experiment
The generation of nickel-base alloy weld seam DDC crackle.
Then have: in nuclear power plant's CRDM Ω nickel-base alloy automatic surfacing, controlling thermal weld stress q in 9030~10710J/
, it can be achieved that being generated without DDC crackle between cm.
The present invention is explained in detail above in conjunction with embodiment, but the present invention is not limited to above-described embodiments, at this
Field those of ordinary skill within the scope of knowledge, can also make various changes without departing from the purpose of the present invention
Change.The content being not described in detail in the present invention can use the prior art.
Claims (7)
1. one kind is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crack controlling means, it is characterised in that: specific packet
Include following steps:
Step 1: components preparation；
Step 2: equipment is connect using argonaut welding and carries out the evaluation of control rod drive mechanism Ω sealing structure bead-welding technology；
Step 3: respectively according to RCC-M standard and ASME standard, size, visual, Liquid Penetrant etc. are carried out to procedure qualification test specimen
Non-destructive testing and the destructive test of metallographic, chemical composition analysis.
2. one kind according to claim 1 is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crackle controlling party
Method, it is characterised in that: in the step 1: driving mechanism Ω sealing structure upper end plugs (1) and lower part drive throw of lever casing
(3) it is processed using 00Cr18Ni10N bar, obtains Ω seal-weld (2) using ER316L welding wire sealing welding.
3. one kind according to claim 1 is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crackle controlling party
Method, it is characterised in that: welding condition is set in the step 2, and thermal weld stress Q is between 9030~10710J/cm.
4. one kind according to claim 3 is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crackle controlling party
Method, it is characterised in that: welding gun protective gas in the step 2: argon gas >=99.99%.
5. one kind according to claim 4 is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crackle controlling party
Method, it is characterised in that: welding technology uses in the step 2: it does not swing, monofilament weldering, multiple tracks welding technology.
6. one kind according to claim 5 is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crackle controlling party
Method, it is characterised in that: built-up welding maintenance process evaluates technological parameter in the step 2 are as follows:
7. one kind according to claim 6 is related to driving mechanism Ω seal-weld nickel alloy cladding DDC crackle controlling party
Method, it is characterised in that: the present invention is suitable for the nickel alloy cladding of nuclear power plant's control rod drive mechanism Ω seal-weld.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810244192.9A CN110293280B (en) | 2018-03-23 | 2018-03-23 | DDC (direct digital control) crack control method for omega sealing weld nickel-based alloy surfacing of driving mechanism |
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| CN201810244192.9A CN110293280B (en) | 2018-03-23 | 2018-03-23 | DDC (direct digital control) crack control method for omega sealing weld nickel-based alloy surfacing of driving mechanism |
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| CN110293280B CN110293280B (en) | 2021-08-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110948106A (en) * | 2019-11-01 | 2020-04-03 | 上海核工程研究设计院有限公司 | Sealing weld joint all-in-one machine of nuclear reactor control rod driving mechanism and operation method |
| CN112475537A (en) * | 2020-11-11 | 2021-03-12 | 国家能源集团谏壁发电厂 | On-site repair method for T23 water wall based on surfacing technology |
| CN113996962A (en) * | 2021-11-25 | 2022-02-01 | 中国核动力研究设计院 | Surfacing method for omega-shaped sealing weld at lower part of control rod driving mechanism |
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| GB1406704A (en) * | 1972-02-24 | 1975-09-17 | Gkn Sankey Ltd | Emission control device |
| JP2001079663A (en) * | 1999-09-10 | 2001-03-27 | Babcock Hitachi Kk | Surface treatment method for welded structure in nuclear reactor |
| CN104658618A (en) * | 2015-01-23 | 2015-05-27 | 李泽文 | Nickel-based alloy pressure-resistant shell and implementation method thereof |
| CN105195924A (en) * | 2015-09-25 | 2015-12-30 | 机械科学研究院哈尔滨焊接研究所 | Nickel baseband pole electroslag surfacing sintering flux and preparation method |
| CN105945393A (en) * | 2016-07-15 | 2016-09-21 | 中国核动力研究设计院 | Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1406704A (en) * | 1972-02-24 | 1975-09-17 | Gkn Sankey Ltd | Emission control device |
| JP2001079663A (en) * | 1999-09-10 | 2001-03-27 | Babcock Hitachi Kk | Surface treatment method for welded structure in nuclear reactor |
| CN104658618A (en) * | 2015-01-23 | 2015-05-27 | 李泽文 | Nickel-based alloy pressure-resistant shell and implementation method thereof |
| CN105195924A (en) * | 2015-09-25 | 2015-12-30 | 机械科学研究院哈尔滨焊接研究所 | Nickel baseband pole electroslag surfacing sintering flux and preparation method |
| CN105945393A (en) * | 2016-07-15 | 2016-09-21 | 中国核动力研究设计院 | Surfacing repair method for dissimilar metal pipeline of safety end of voltage stabilizer in nuclear power station |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110948106A (en) * | 2019-11-01 | 2020-04-03 | 上海核工程研究设计院有限公司 | Sealing weld joint all-in-one machine of nuclear reactor control rod driving mechanism and operation method |
| CN112475537A (en) * | 2020-11-11 | 2021-03-12 | 国家能源集团谏壁发电厂 | On-site repair method for T23 water wall based on surfacing technology |
| CN113996962A (en) * | 2021-11-25 | 2022-02-01 | 中国核动力研究设计院 | Surfacing method for omega-shaped sealing weld at lower part of control rod driving mechanism |
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