CN107164759B - A kind of method of axial workpiece field repair - Google Patents
A kind of method of axial workpiece field repair Download PDFInfo
- Publication number
- CN107164759B CN107164759B CN201710415923.7A CN201710415923A CN107164759B CN 107164759 B CN107164759 B CN 107164759B CN 201710415923 A CN201710415923 A CN 201710415923A CN 107164759 B CN107164759 B CN 107164759B
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- axial workpiece
- laser
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- powder
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
Abstract
The present invention provides a kind of methods of axial workpiece field repair.The method of axial workpiece field repair provided by the invention, the following steps are included: conveying cladding material in Axle Surface by the way of airborne feeding coaxial powder-feeding, with manipulator fixed laser cladding head, by the mobile realization of manipulator to the laser repairing of axial workpiece difference damage location.The present invention carries out laser repairing using airborne feeding coaxial powder-feeding mode, and pump shaft is motionless, carries out founding reparation to pump shaft defect using mechanical hand-motion laser melting coating head, realizes the field repair of axial workpiece, simple process is high-efficient, shortens and repairs the duration.
Description
Technical field
The present invention relates to laser repairing technical field, in particular to a kind of method of axial workpiece field repair.
Background technique
The function of nuclear power recirculating cooling water system (CRF) is the condenser by two independent inlet channels to every unit
With supplement heat rejecter water system (SEN) provide refrigerated sea water, and by recirculated water by siphonic water-collecting well be discharged to greatly it is marine.Water circulating pump is core
The pump of power station maximum flow has surprising liquid handling capability, and by taking Yangjiang Nuclear Power Station as an example, water circulating pump flow is
30.8m3/ s is equivalent to conveying per second and weighs 31.7 tons of seawater.It can be seen that nuclear power CRF pump shaft is in high pressure, high speed, sea
It is on active service under the environmental condition of aqueous corrosion, after a period of work, is likely to meeting at pump shaft axle journal, axle sleeve or flange position
The defects of generating abrasion, corrosion.
One nuclear power CRF circulating pump value is in several hundred to up to ten million members, if causing nothing because of some lesser defects
Method uses or there are security risks must not be changed without circulating pump, it is clear that it will cause very big economic waste, and the duration can be very long,
One day economic loss generated of maintenance shut-down is up to millions of members.Currently, traditional axle repairing method, such as built-up welding, gas are protected
The recovery techniques such as weldering, submerged-arc welding, argon arc welding, thermal spraying, all have certain problems.Wherein, thermal spraying is by coating and workpiece
Surface passes through mechanical bond together, so that pump shaft and the not high easy peeling of repair layer bond strength；And it built-up welding, gas shield welding, buries
The method of arc-welding etc. can make the large deformation of pump shaft heat affected area big, to influence its dynamic balancing or the damage original performance of pump shaft.
Laser repairing is repair layer and workpiece by alloy powder together with workpiece surface fusing cooled and solidified using laser
When metallurgical bonding, relative to thermal spraying, bond strength improves very much.But axis class laser repairing in the prior art all can not
Reparation operation is carried out at the scene, and the workshop for requiring to transport on axis laser producer is repaired, and is removed and is dealt into servicing depot's progress
Reparation can also generate very big time economic loss.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of axial workpiece field repair.Method provided by the invention can be realized
The field repair of axial workpiece shortens and repairs the duration, while reducing heat affected area range.
The present invention provides a kind of methods of axial workpiece field repair, comprising the following steps: coaxial using airborne feeding
The mode of powder feeding passes through the movement of manipulator with manipulator fixed laser cladding head in Axle Surface conveying cladding material
Realize the laser repairing to axial workpiece difference damage location.
Preferably, the cladding material includes the component of following mass content: chromium 24~26%, molybdenum 8~10%, and niobium 4~
6%, iron 2~5%, cobalt 0.5~1%, the nickel of carbon 0.1~0.2% and surplus.
Preferably, the granularity of the cladding material is 100~200 mesh.
Preferably, the gas of the powder feeding is inert gas.
Preferably, the flow of the inert gas is 2~4L/min.
Preferably, the powder flow of the powder feeding is 20~30g/min.
Preferably, the power of the laser repairing is 600~800W.
Preferably, the movement speed of the laser melting coating head is 3~5mm/s.
Preferably, the focus lamp of the laser melting coating head is 150~180mm at a distance from Axle Surface.
Preferably, axial workpiece is pre-processed before the laser repairing, the pretreatment successively includes decontamination, flaw detection
It is repaired with mill.
The present invention provides a kind of methods of axial workpiece field repair, comprising the following steps: coaxial using airborne feeding
The mode of powder feeding passes through the movement of manipulator with manipulator fixed laser cladding head in Axle Surface conveying cladding material
Realize the laser repairing to axial workpiece difference damage location.The present invention carries out laser using airborne feeding coaxial powder-feeding mode and repairs
It is multiple, reduce heat affected area range, improves the quality and powder using efficiency of repair layer；Pump shaft utilizes machinery without disassembly and rotation
Hand-motion laser melting coating head carries out founding reparation to pump shaft defect, realizes the field repair of axial workpiece, simple process
It is high-efficient, it shortens and repairs the duration.
Also, axial workpiece, after method field repair provided by the invention, repair layer and pump shaft bond strength are high, do not take off
It falls；The defects of pump shaft deformation is small after reparation, and surface accuracy is high, flawless stomata, heat affected area is small, does not change matrix；And
Wearability and corrosion resistance are better than original material.The experimental results showed that axial workpiece is repaired through method scene provided by the invention
After multiple, surface roughness reaches 8 μm, and beat 1~2m, and surface abrasion resistance and corrosion resistance are doubled compared with raw material.
Specific embodiment
The present invention provides a kind of methods of axial workpiece field repair, comprising the following steps: coaxial using airborne feeding
The mode of powder feeding passes through the movement of manipulator with manipulator fixed laser cladding head in Axle Surface conveying cladding material
Realize the laser repairing to axial workpiece difference damage location.In the present invention, the coaxial powder-feeding can reduce cladding layer gas
Hole reduces heat affected area range, improves the quality and powder using efficiency of repair layer.
In the present invention, the axial workpiece is preferably circulating pump pump shaft, more preferably nuclear power recirculating cooling water system
(CRF) circulating pump pump shaft.In the present invention, the material of the axial workpiece is preferably two phase stainless steel, more preferably Cr18 type
Stainless steel, Cr23 type stainless steel, Cr22 type stainless steel or Cr25 type stainless steel, most preferably 00Cr22Ni5Mo3N,
Cr23Ni4N, Cr25Ni6Mo3Cu2N0.2 or Cr25Ni7Mo3.7N0.3.
In the present invention, the cladding material preferably includes the component of following mass content: chromium 24~26%, and molybdenum 8~
10%, niobium 4~6%, iron 2~5%, cobalt 0.5~1%, the nickel of carbon 0.1~0.2% and surplus, more preferably chromium 24.5~
25.5%, molybdenum 8.5~9.5%, niobium 4.5~5.5%, iron 3~4%, cobalt 0.6~0.8%, carbon 0.14~0.18%, Yi Jiyu
The nickel of amount, most preferably chromium 25%, molybdenum 9%, niobium 5%, iron 3.5%, cobalt 0.7%, the nickel of carbon 0.15% and surplus.At this
In invention, by addition Cr in the cladding material, Ni element improves wearability and corrosion resistance；Add a certain amount of carbon
Carbide alloy phase is generated with alloying element, repair layer intensity and wearability are improved by dispersion-strengtherning and solution strengthening.
In the present invention, the granularity of the cladding material is preferably 100~200 mesh, more preferably 120~180 mesh, optimal
It is selected as 140~160 mesh.The present invention restriction not special to the operation of the preparation of the cladding material, using art technology
The method of alloy powder is prepared known to personnel.In the present invention, the cladding material is preferably prepared by melt atomization
It obtains.
In the present invention, the gas of the powder feeding is preferably inert gas, more preferably argon gas or nitrogen.In the present invention
In, the flow of the inert gas is preferably 2~4L/min, more preferably 2.5~3.5L/min, most preferably 2.8~3.2L/
min.In the present invention, the powder flow of the powder feeding is preferably 20~30g/min, more preferably 22~28g/min, most preferably
For 24~26g/min.In the present invention, the inert gas can prevent the oxidation of molten alloy, the gas stream of the powder feeding
Amount and powder flow can further increase the quality of cladding layer, improve the performance of repair layer.
The present invention does not have special restriction to the device of the laser repairing, using laser well known to those skilled in the art
Cladding equipment.In the present invention, the device of the laser repairing is preferably that the diode fiber coupling output of 1064nm connects
Continuous laser.
In the present invention, the power of the laser repairing is preferably 600~800W, more preferably 650~750W, most preferably
For 680~720W.In the present invention, the movement speed of the laser melting coating head is preferably 3~5mm/s, more preferably 3.5~
4.5mm/s, most preferably 3.8~4.2mm/s.In the present invention, the focus lamp and Axle Surface of the laser melting coating head
Distance be preferably 150~180mm, more preferably 160~170mm, most preferably 165mm.In the present invention, the laser is molten
Head is covered under mechanical hand-motion relative to pump shaft movement, passes through the sweep time that control movement speed controls damage zone；When described
When damage zone area or big depth, select lower movement speed to improve sweep time within the above range.The present invention is preferred
Stop swashing the damage location when covering damaged location completely in repair layer, and being higher by the datum level on damage location periphery slightly
Light reparation.
The present invention preferably pre-processes axial workpiece before laser repairing, and the pretreatment successively includes decontamination, visits
Wound and mill are repaired.The not special restriction of operation of the present invention to the decontamination, is gone using alloy well known to those skilled in the art
Dirty technical solution.In the present invention, the flaw detection is preferably penetrant inspection.In the present invention, the flaw detection can obtain
The defect distribution and fatigue layer information for taking pump shaft surface, improve the accuracy of laser repairing.
The not special restriction of the operation that the present invention repairs the mill, using the skill well known to those skilled in the art ground and repaired
Art scheme.In the present invention, the mill, which is repaired, to remove the defect on pump shaft surface and fatigue layer.
The present invention carries out surface processing to the axial workpiece after the laser repairing preferably after laser repairing.The present invention couple
The not special restriction of the operation of the surface processing, using the table well known to those skilled in the art that can be used in site operation
The technical solution of face processing.In the present invention, the surface processing preferably includes to grind.In the present invention, the surface
Processing makes the restoring area of axial workpiece restore original size.
In order to further illustrate the present invention, below with reference to embodiment to the side of axial workpiece field repair provided by the invention
Method is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1:
Certain nuclear power plant, maintenance find there is abrasion and corrosion damage, fray size Φ at CRF circulating pump pump shaft axle journal
440, length 300mm, wearing depth 0.5mm are worn, pump shaft material is two phase stainless steel 00Cr22Ni5Mo3N.
It to abrasion surface clean decontamination and detects a flaw, is repaired by mill and gradually remove fault location and fatigue layer；
Select the Co-based alloy powder of 200 mesh, composition by weight percent are as follows: chromium 25%, molybdenum 8.5%, niobium 5%, iron
2.4%, cobalt 0.8%, carbon 0.2% and surplus are nickel, carry out laser repairing；
Laser light source uses wavelength for the diode fiber of 1064nm coupling output continuous wave laser, laser power 800W,
Laser scanning speed is 5mm/s, and workpiece is swashed apart from processing head focus lamp 180mm using the airborne powder coaxial powder-feeding of argon gas
Light reparation, gas flow 2L/min, powder flow 20g/min；Coaxial cladding head is fixed on manipulator, to mechanical hand-knitted
Journey allows cladding head to overlap scanning one by one along wear surface axial direction；
Cladding, which is finished, is refined again to the diameter of axle using pneumatic polishing having a size of 440, surface inspection zero defect, by more than a year when
Between operating, there is no the undesirable conditions such as the peeling that falls off, and work well.
To rear region and original axis class progress wearability test is repaired, under same experimental condition, repair layer abrasion is damaged
Quality 3mg is lost, raw material abrasion loss quality 6mg is doubled.
Embodiment 2:
There are pore and some biggish erosions at some corrosion in Fujian nuclear power plant, maintenance discovery CRF circulating pump flange position
Hole, pore have at seven or eight, and between 0.5~2mm, etch pit has at two or three size, and for size between 10~20mm, pump shaft material is same
For two phase stainless steel (00Cr25Ni7Mo4N).
It is pneumatically polished pore, then is pneumatically polished place coarse in etch pit, then cleaning flaw detection polishing defect, is selected
100 mesh Co-based alloy powders, composition by weight percent are as follows: chromium 26%, molybdenum 8%, niobium 4%, iron 2%, cobalt 0.5% and surplus are
Nickel carries out laser repairing；
Laser light source uses wavelength for the diode fiber of 1064nm coupling output continuous wave laser, laser power 600W,
Laser scanning speed is 3mm/s, and workpiece is swashed apart from processing head focus lamp 150mm using the airborne powder coaxial powder-feeding of argon gas
Light reparation, gas flow 4L/min, powder flow 30g/min；Coaxial cladding head is fixed on manipulator, is repaired to pore
When multiple, processing head alignment pore powder feeding is allowed to go out light 2 seconds, when repairing to etch pit, allows cladding head along erosion manipulator programming
Pitted surface successively overlap joint scanning one by one；
Cladding, which is finished, is refined again using pneumatic polishing to original size, surface inspection zero defect, by the time more than 2 years
Operating, there is no the situations such as runaway corrosion, work well.
The corrosion of layer material is repaired under the conditions of same with original axis class progress neutral salt spray test to rear region is repaired
Depth is doubled in 0.1mm, raw material corrosion depth in 0.25mm or so.
As can be seen from the above embodiments, method provided by the invention can be used for nuclear power CRF pump shaft scene laser repairing, contracting
The short reparation duration has preferable economic benefit and social benefit；Repair layer and pump shaft bond strength are high, do not fall off, wear-resisting
Property and corrosion resistance are better than original material；It is high to deform small precision, the defects of flawless stomata, heat affected area is small not to change matrix
Tissue；It can repeat to repair to use, can be widely applied to the scene machine maintenance of various axis classes.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (9)
1. a kind of method of axial workpiece field repair, comprising the following steps: in axis by the way of airborne feeding coaxial powder-feeding
Class piece surface conveys cladding material, with manipulator fixed laser cladding head, by the mobile realization of manipulator to axial workpiece
The laser repairing of different damage locations；
The cladding material includes the component of following mass content: chromium 24~26%, molybdenum 8~10%, niobium 4~6%, and iron 2~
5%, cobalt 0.5~1%, the nickel of carbon 0.1~0.2% and surplus.
2. the method according to claim 1, wherein the granularity of the cladding material is 100~200 mesh.
3. the method according to claim 1, wherein the gas of the powder feeding is inert gas.
4. according to the method described in claim 3, it is characterized in that, the flow of the inert gas is 2~4L/min.
5. the method according to claim 1, wherein the powder flow of the powder feeding is 20~30g/min.
6. the method according to claim 1, wherein the power of the laser repairing is 600~800W.
7. the method according to claim 1, wherein the movement speed of the laser melting coating head is 3~5mm/s.
8. method according to claim 1 or claim 7, which is characterized in that the focus lamp and axial workpiece of the laser melting coating head
The distance on surface is 150~180mm.
9. the method according to claim 1, wherein pre-processed before the laser repairing to axial workpiece,
The pretreatment successively includes that decontamination, flaw detection and mill are repaired.
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| CN201710415923.7A CN107164759B (en) | 2017-06-06 | 2017-06-06 | A kind of method of axial workpiece field repair |
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| CN201710415923.7A CN107164759B (en) | 2017-06-06 | 2017-06-06 | A kind of method of axial workpiece field repair |
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| CN107164759B true CN107164759B (en) | 2019-02-19 |
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| JP7238122B2 (en) * | 2018-11-15 | 2023-03-13 | ウェスティングハウス エレクトリック ベルギー | Repair process using laser metal powder deposition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074625A (en) * | 2013-01-16 | 2013-05-01 | 上海交通大学 | Movable laser cladding and repairing system |
| CN104962906A (en) * | 2015-06-25 | 2015-10-07 | 江苏斯普瑞科技有限公司 | Power-driven laser field repair system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10112254B2 (en) * | 2014-08-21 | 2018-10-30 | Huntington Alloys Corporation | Method for making clad metal pipe |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074625A (en) * | 2013-01-16 | 2013-05-01 | 上海交通大学 | Movable laser cladding and repairing system |
| CN104962906A (en) * | 2015-06-25 | 2015-10-07 | 江苏斯普瑞科技有限公司 | Power-driven laser field repair system |
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