CN106695144A - Welding repair method for nuclear power equipment made of low-alloy high-strength steel - Google Patents
Welding repair method for nuclear power equipment made of low-alloy high-strength steel Download PDFInfo
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- CN106695144A CN106695144A CN201510419762.XA CN201510419762A CN106695144A CN 106695144 A CN106695144 A CN 106695144A CN 201510419762 A CN201510419762 A CN 201510419762A CN 106695144 A CN106695144 A CN 106695144A
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Abstract
The invention discloses a welding repair method for nuclear power equipment made of low-alloy high-strength steel. The welding repair method comprises the step: realizing a tempering process of a coarse grain region of a parent metal heat-affected region formed by a first-layer welding bead by welding heat circulation formed by a second-layer welding bead. By controlling the energy of a welding line, the impact absorbing energy of the coarse grain region of the heat-affected region of the obtained welded joint is equal to that of a conventional manufacturing process, so that the requirement for manufacturing quality can be completely met, and post-welding heat treatment is not needed.
Description
Technical field
The invention belongs to Welding Repair Technology field, and in particular to a kind of in-service nuclear power generating equipment without post weld heat treatment
Welding repair method.
Background technology
During nuclear power generating equipment is on active service under the various complex working condition environment such as HTHP, neutron irradiation, additional load,
Because the effect of the agine mechaisms such as mechanical fatigue, stress corrosion cracking causes that the local of part of appliance produces defect, sternly
Ghost image rings the safe operation of equipment.To cause the device to normally perform military service function, frequently with REPAIR WELDING or replacing portion
The method of part recovers the function of failure site.
Primary Ioops main equipment (reactor pressure vessel, evaporator, voltage-stablizer etc.) generally uses low-alloy high-strength
Steel material, due to the effect of Thermal Cycle during conventional REPAIR WELDING, repairs position welding heat affected zone and deposits
Hardness is high, poor toughness coarse grain zone (referring to Fig. 1), welding conditions require using post weld heat treatment thick to improve
Crystalline region performance.During multi-layer multi-pass welding, IRCGHAZ is there is also.Referring to Fig. 2, IRCGHAZ is
The critical zone of latter welding bead is superimposed formed region with the coarse grain zone that previous welding bead is formed in same layer.Result of study
Show, IRCGHAZ is the worst region of performance in whole welding point, easily triggers local embrittlement problem, because
This is necessary to take the mode of post weld heat treatment to eliminate coarse grain zone, especially IRCGHAZ.
However, some objective condition limit the application of post weld heat treatment：
1) weldering is made the problems such as the size of equipment, structural complexity, the REPAIR WELDING condition at scene, the deformation of heat treatment
Heat treatment enforcement difficulty increases afterwards, and the REPAIR WELDING particularly with in-service equipment cannot implement postwelding heat in many cases
Treatment；
2) the primary Ioops medium of nuclear power generating equipment has radioactivity, and realizes that post weld heat treatment is often needed as thick-walled vessel
To be heated from inside and outside both sides, personnel's dosage severe overweight often limits the feasibility of post weld heat treatment.
Therefore, in the urgent need to a kind of nuclear power generating equipment for being made of REPAIR WELDING low-alloy high-strength steel for exempting post weld heat treatment
Method.
The content of the invention
The purpose of the present invention is the hot shadow to solve to be caused during the nuclear power generating equipment REPAIR WELDING being made up of low-alloy steel
Hardness present in sound area is high, poor toughness weakness zone, due to objective condition limitation, it is difficult to cannot even implement
Post weld heat treatment improves the technical problem of performance, proposes a kind of to recover the welding of its performance without post weld heat treatment
Restorative procedure.
The welding repair method for exempting post weld heat treatment proposed by the present invention, is welded by effectively control ground floor/second layer
The Thermal Cycle in road, reaches the purpose for improving mother metal thermal stress strength performance, so as to exempt post weld heat treatment.
The welding repair method that the present invention is provided makes ground floor welding bead shape using the Thermal Cycle that second layer welding bead is formed
Into the coarse grain zone of mother metal heat affected area realize drawing process.
Preferably, described ground floor welding bead covers the mother metal of welding position, the second layer welding bead and the second layer with
On welding bead cover the weld seam of preceding layer welding bead accordingly.According to the condition of current welding, third layer and above welding bead
Heat affected area do not further relate to brittle low-alloy steel mother metal, and the mainly weld metal of excellent performance, therefore,
The requirement of the equal solderless wiring energy of welding bead of third layer and the above.
Preferably, the weld heat input of ground floor welding bead and second layer welding bead is 8.25kJ/cm~16.2kJ/cm.According to
Welding conditions, those skilled in the art can select suitable wire feed rate, such as 16.5cm/min~80cm/min
To complete corresponding REPAIR WELDING.
Preferably, the Thermal Cycle that second layer welding bead is formed makes the thick of the mother metal heat affected area of ground floor welding bead formation
Temper is realized between 600 DEG C~700 DEG C in crystalline region.
In actual welding manufacturing process, inevitably there is coarse grain zone, first in the ground floor welding bead adjacent with mother metal
IRCGHAZ can be also produced between the adjacent welding bead of layer；Referring to Fig. 3, the impact flexibility of coarse grain zone and IRCGHAZ is poor,
Microhardness is higher, is the weakest region in welding point.Using the method for the present invention, by using suitable
Weld heat input so that the coarse grain zone of ground floor welding bead and the peak temperature of IRCGHAZ are 600 DEG C~700 DEG C,
The coarse grain zone and IRCGHAZ of ground floor welding bead is realized temper at such a temperature, can preferably improve thick
Crystalline region and the performance of IRCGHAZ.
Preferably, the welding uses GTAW welding methods, and the packing material that welding is used is for female with reparation position
The low-alloy steel TIG welding wires of material matching.
The present invention makes second by the effectively weld heat input of control ground floor/second layer welding bead, welding wire feed rate
The coarse grain zone scope that effective tempered area covering ground floor welding bead below layer welding bead critical zone is formed, can effectively eliminate
Coarse grain zone, particularly IRCGHAZ, so as to reach the tempering to coarse grain zone.To ensure tempering effect, sealing wire
Energy should be in 8.25kJ/cm~16.2kJ/cm.The present invention by controlling weld heat input, the heat of the welding point for obtaining
The impact absorbing energy and manufacturing processes customary of zone of influence coarse grain zone quite, can meet the demand of workmanship completely,
Post weld heat treatment need not be carried out.
Brief description of the drawings
Fig. 1, welding bead coarse grain zone schematic diagram.
Fig. 2, with the adjacent welding bead IRCGHAZ schematic diagram of layer.
Fig. 3 a and Fig. 3 b are respectively heat affected area impact absorbing energy and microhardness.
Fig. 4 a, the welding point coarse grain zone fracture photo of embodiment 1.
Fig. 4 b, the welding point coarse grain zone fracture apperance of embodiment 1.
The microstructure of Fig. 5 a, the welding point coarse grain zone of embodiment 1.
Fig. 5 b, the microstructure of the welding point IRCGHAZ of embodiment 1.
The cross-section photographs of Fig. 6, the welding piece of embodiment 2.
The microstructure of Fig. 7 a, the welding point coarse grain zone of embodiment 1.
Fig. 7 b, the microstructure of the welding point IRCGHAZ of embodiment 1.
Each welding bead position view of Fig. 8, welding repair method of the present invention.
Specific embodiment
Embodiment 1：
The present embodiment carries out automatic TIG built-up welding, mother metal using the method for the present invention on the surface of SA508-3 steel forgings
Specification is 500mm × 500mm × 60mm.Welding material is commercial low-alloy high-strength steel welding wire, a diameter of 1.2mm.
1st layer of welding bead and the 2nd layer of pass weld heat input are 9.9kJ/cm, and wire feed rate is 40cm/min, weld layer
Number is 2 layers of multiple tracks, does not take post weld heat treatment.2 layers of foregoing multi-pass welding schematic diagram are referring to Fig. 8, ground floor weldering
Road covers the mother metal of welding position, and the welding bead more than second layer welding bead and the second layer fills up preceding layer weldering accordingly
The weld seam in road.
Coarse grain zone microhardness and impact absorbing energy result of the test after the completion of welding is tested, its is micro- hard
Degree HV0.5It is 300-323, hence it is evident that be improved, its impact absorbing energy KV2(- 20 DEG C) is 173-178J,
Substantially it is improved.Result of the test shows that the joint thermal stress strength welded according to the method for the present invention is rushed
Hit absorption work(suitable with the performance through Overheating Treatment.
Referring to Fig. 4 a and Fig. 4 b, the fracture mode of welding point is ductile rupture；Referring to Fig. 5 a and Fig. 5 b, welding
The coarse grain zone and IRCGHAZ of joint obtain the tempered sorbite tissue of excellent combination property, and coarse grain zone is micro-
Hardness is slightly above common process joint, but fully meets workmanship requirement, is difficult to during REPAIR WELDING or nothing
When method implements post weld heat treatment, completely can be as the welding repair method for exempting post weld heat treatment.
Embodiment 2：
Using the method for the present invention to 60mm thickness SA508-3 steel forgings surface type defects simulation REPAIR WELDINGs, use
Automatic TIG welding connects technique, and mother metal specification is 500mm × 500mm × 60mm, groove depth 12mm, groove
Angle 30o, the 1st layer of welding bead and the 2nd layer of pass weld heat input are 12.6kJ/cm, and wire feed rate is 60cm/min,
Welding material is commercial low-alloy high-strength steel welding wire, a diameter of 1.2mm.
Test specimen cross-section photographs using simulation REPAIR WELDING of the invention are shown in Fig. 6.
The coarse grain zone microhardness HV of the present embodiment0.5It is 303-330, and referring to Fig. 7 a and Fig. 7 b, crystalline region and faces
Boundary coarse grain zone obtains the tempered sorbite tissue of excellent combination property.
Compared with common process, the joint thermal stress strength of the inventive method welding and IRCGHAZ obtain
The tempered sorbite tissue of excellent combination property, coarse grain zone microhardness is slightly above common process joint, but completely
Meet workmanship requirement, when being difficult to during REPAIR WELDING or post weld heat treatment cannot be implemented, can make completely
To exempt the welding repair method of post weld heat treatment.
Claims (4)
1. a kind of welding repair method of the nuclear power generating equipment being made up of low-alloy high-strength steel, it is characterised in that the weldering
Connect the mother metal heat affected area that restorative procedure forms ground floor welding bead using the Thermal Cycle that second layer welding bead is formed
Realize drawing process in coarse grain zone.
2. welding repair method according to claim 1, it is characterised in that described ground floor welding bead covering
The mother metal of welding position, welding bead more than described second layer welding bead and the second layer covers preceding layer welding bead accordingly
Weld metal.
3. welding repair method according to claim 1 and 2, it is characterised in that ground floor welding bead and second
The weld heat input of layer welding bead is identical, and between 8.25kJ/cm~16.2kJ/cm.
4. welding repair method according to claim 1 and 2, it is characterised in that what second layer welding bead was formed
Thermal Cycle makes the coarse grain zone of the mother metal heat affected area of ground floor welding bead formation be realized back between 600 DEG C~700 DEG C
Fire treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510419762.XA CN106695144B (en) | 2015-07-17 | 2015-07-17 | Welding repair method for nuclear power equipment made of low-alloy high-strength steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510419762.XA CN106695144B (en) | 2015-07-17 | 2015-07-17 | Welding repair method for nuclear power equipment made of low-alloy high-strength steel |
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| CN106695144A true CN106695144A (en) | 2017-05-24 |
| CN106695144B CN106695144B (en) | 2020-04-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112045328A (en) * | 2020-08-18 | 2020-12-08 | 上海核工程研究设计院有限公司 | J-shaped welding seam repair method for pressure boundary of penetration piece of nuclear-grade pressure-bearing equipment |
| CN112975073A (en) * | 2021-02-06 | 2021-06-18 | 西安热工研究院有限公司 | Method for controlling crystal grain morphology of alloy steel weld joint |
| CN113070635A (en) * | 2021-04-06 | 2021-07-06 | 国家能源集团泰州发电有限公司 | Welding heat treatment process for repairing long-term service P92 steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313166A (en) * | 2000-11-22 | 2001-09-19 | 顿广宽 | Technology for repairing gear and axle of pumping unit |
| EP1878528A2 (en) * | 2006-07-14 | 2008-01-16 | Corus UK LTD. | A method of weld repairing or cladding a steel bloom rail or other part of a railway |
| CN102922087A (en) * | 2012-11-21 | 2013-02-13 | 宁夏共享集团有限责任公司 | Welding repair method of defects after precision processing of large-scale carbon steel casting |
| JP2013146753A (en) * | 2012-01-18 | 2013-08-01 | Mitsubishi Heavy Ind Ltd | Welding method |
| CN103273200A (en) * | 2013-03-21 | 2013-09-04 | 上海交通大学 | Laser cladding restoring method for die steel |
-
2015
- 2015-07-17 CN CN201510419762.XA patent/CN106695144B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313166A (en) * | 2000-11-22 | 2001-09-19 | 顿广宽 | Technology for repairing gear and axle of pumping unit |
| EP1878528A2 (en) * | 2006-07-14 | 2008-01-16 | Corus UK LTD. | A method of weld repairing or cladding a steel bloom rail or other part of a railway |
| JP2013146753A (en) * | 2012-01-18 | 2013-08-01 | Mitsubishi Heavy Ind Ltd | Welding method |
| CN102922087A (en) * | 2012-11-21 | 2013-02-13 | 宁夏共享集团有限责任公司 | Welding repair method of defects after precision processing of large-scale carbon steel casting |
| CN103273200A (en) * | 2013-03-21 | 2013-09-04 | 上海交通大学 | Laser cladding restoring method for die steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112045328A (en) * | 2020-08-18 | 2020-12-08 | 上海核工程研究设计院有限公司 | J-shaped welding seam repair method for pressure boundary of penetration piece of nuclear-grade pressure-bearing equipment |
| CN112975073A (en) * | 2021-02-06 | 2021-06-18 | 西安热工研究院有限公司 | Method for controlling crystal grain morphology of alloy steel weld joint |
| CN112975073B (en) * | 2021-02-06 | 2022-06-21 | 西安热工研究院有限公司 | Method for controlling crystal grain morphology of alloy steel weld joint |
| CN113070635A (en) * | 2021-04-06 | 2021-07-06 | 国家能源集团泰州发电有限公司 | Welding heat treatment process for repairing long-term service P92 steel |
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| CN106695144B (en) | 2020-04-24 |
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| CB02 | Change of applicant information |
Address after: 150028 No. 2077, Chuangxin Road, Harbin, Heilongjiang, Songbei Applicant after: HARBIN WELDING INSTITUTE Ltd. Applicant after: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Applicant after: INSTITUTE FOR STANDARDIZATION OF NUCLEAR INDUSTRY Applicant after: Shanghai Nuclear Engineering Research & Design Institute Address before: 150028, 2077, science and technology innovation road, Harbin, Heilongjiang, Songbei Applicant before: HARBIN WELDING INSTITUTE, CHINA ACADEMY OF MACHINERY SCIENCE AND TECHNOLOGY Applicant before: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Applicant before: INSTITUTE FOR STANDARDIZATION OF NUCLEAR INDUSTRY Applicant before: Shanghai Nuclear Engineering Research & Design Institute |
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