CN102899660A - Method and nozzle improving laser cladding effect - Google Patents
Method and nozzle improving laser cladding effect Download PDFInfo
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- CN102899660A CN102899660A CN2012103088157A CN201210308815A CN102899660A CN 102899660 A CN102899660 A CN 102899660A CN 2012103088157 A CN2012103088157 A CN 2012103088157A CN 201210308815 A CN201210308815 A CN 201210308815A CN 102899660 A CN102899660 A CN 102899660A
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- shower nozzle
- mixed gas
- shielding gas
- gas
- adding set
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000000694 effects Effects 0.000 title claims abstract description 21
- 238000004372 laser cladding Methods 0.000 title abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 133
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000001307 helium Substances 0.000 claims abstract description 25
- 229910052734 helium Inorganic materials 0.000 claims abstract description 25
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000005465 channeling Effects 0.000 claims description 29
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 23
- 238000002844 melting Methods 0.000 claims description 23
- 230000008018 melting Effects 0.000 claims description 23
- 230000001186 cumulative effect Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000005253 cladding Methods 0.000 abstract description 16
- 239000000126 substance Substances 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 4
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 235000006708 antioxidants Nutrition 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- Laser Beam Processing (AREA)
Abstract
The invention discloses a method and a nozzle improving a laser cladding effect. According to the method for improving the laser cladding effect, during laser cladding, a mixed gas of helium and nitrogen is delivered into a channel of the nozzle as a protection gas; high-pressure nitrogen is simultaneously delivered into another channel of the nozzle as a protection gas, wherein the gas pressure of the mixed gas is lower than that of the high-pressure nitrogen. According to the technical scheme of the method and the nozzle improving the laser cladding effect, protection gases with no chemical component and different gas pressures are adopted, a powder flow field and a working environment are protected simultaneously, and cladding quality can be greatly improved; multiple protection gas channels are designed in the nozzle, such that multiple protection gases with different components and different gas pressures can be applied in cladding. Therefore, clad layer quality is improved, cracking is reduced, shrinkage loosening is reduced, shrinkage porosity is reduced, and clad layer compactness is improved.
Description
Technical field
The present invention relates to a kind of method and shower nozzle that improves the laser melting coating effect, belong to field of laser cladding.
Background technology
Laser melting coating is the superlaser surface cladding, its physical process is that under the irradiation of High energy laser beam, substrate surface is melted rapidly, liquid metal forms a small-scale molten bath, in this molten bath, metallic substance originally mixes mutually with the powder that is added, and forms the new liquid-metal layer of one deck, treat after the laser beam process, the temperature in molten bath reduces, and liquid metal cools off rapidly, forms the new solid-state cladding layer of one deck in the metallic surface.Laser melting coating can change the metallicity of this key position greatly, such as hardness, wear resistance, thermotolerance, erosion resistance etc.
For preventing at high temperature oxidation of metal, design protection gas passage in the cladding shower nozzle, injecting protective gas when carrying out laser melting coating forms the shielding gas field not oxidized with the protection metal.Usually only use nitrogen as shielding gas in the prior art, though tool has certain effect, the cladding layer air spots is sliding, is full of pore, and because surface tension is inadequate, there is collapse phenomenon on the cladding surface.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of for a kind of method and shower nozzle that improves the laser melting coating effect.
In order to reach above purpose; the technical solution used in the present invention is: a kind of method that improves the laser melting coating effect; when laser melting coating; a passage at shower nozzle passes into the mixed gas of helium and nitrogen as shielding gas; another passage at shower nozzle passes into high pressure nitrogen simultaneously as shielding gas, and the air pressure of mixed gas is lower than the air pressure of high pressure nitrogen.
Preferably, in the mixed gas, the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.
More preferably, the volume ratio of mixed gas and high pressure nitrogen is greater than 1:3.
More preferably, the air pressure of mixed gas is 1.5～2 normal atmosphere, and the air pressure of high pressure nitrogen is 3～5 normal atmosphere.
Another technical scheme provided by the present invention is: a kind of shower nozzle of the method for above-mentioned raising laser melting coating effect, and it has the laser channeling that is opened in these shower nozzle central authorities; be opened in a end around the laser channeling the other end that is connected with a kind of shielding gas adding set and run through the first shielding gas passage of shower nozzle bottom surface; an end that is opened in the first shielding gas passage periphery the other end that is connected with the powder adding set runs through the powder channel of shower nozzle bottom surface; an end that is opened in the powder channel periphery the other end that is connected with another kind of shielding gas adding set runs through the second shielding gas passage of shower nozzle bottom surface.
Preferably; one end of the first shielding gas passage is connected with the mixed gas adding set; the second shielding gas passage is connected with the high pressure nitrogen adding set, and mixed gas is the mixed gas of helium and nitrogen, and wherein the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.
More preferably, the first shielding gas passage has a plurality of, and evenly distributes around the central shaft of laser channeling; The second shielding gas passage has a plurality of, and evenly distributes around the central shaft of laser channeling.
The present invention also provides a technical scheme: a kind of shower nozzle of the method for above-mentioned raising laser melting coating effect, and it has the laser channeling that is opened in these shower nozzle central authorities; be opened in the first gas atmosphere inlet that the other end laser channeling is connected that is connected with a kind of shielding gas adding set of an end on the shower nozzle; be opened in a end around the laser channeling the other end that is connected with the powder adding set and run through the powder channel of shower nozzle bottom surface; an end that is opened in the powder channel periphery the other end that is connected with another kind of shielding gas adding set runs through the second shielding gas passage of shower nozzle bottom surface.
Preferably; one end of the first gas atmosphere inlet is connected with the mixed gas adding set; the second shielding gas passage is connected with the high pressure nitrogen adding set, and mixed gas is the mixed gas of helium and nitrogen, and wherein the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.
More preferably, the first gas atmosphere inlet and laser channeling connection in the vertical direction apart from the shower nozzle bottom surface more than or equal to 5cm.
More preferably, the first gas atmosphere inlet has a plurality of, and evenly distributes around the central shaft of laser channeling; The second shielding gas passage has a plurality of, and evenly distributes around the central shaft of laser channeling.
Owing to having adopted technique scheme, a kind of method and shower nozzle that improves the laser melting coating effect of the present invention by using the shielding gas without chemical composition, different air pressure, protected powder flow field and Working environment simultaneously, can greatly improve the cladding quality; In the shower nozzle indoor design multiple protective gas passage, can in cladding, use the shielding gas of multiple heterogeneity, different air pressure, improve quality of cladding layer, reduce crackle, shrinkage porosite, shrinkage cavity, improve cladding layer compactness.
Description of drawings
Accompanying drawing 1 is the structural representation of shower nozzle in the embodiment of the invention one;
Accompanying drawing 2 is the structural representation of shower nozzle in the embodiment of the invention two.
Wherein:
1, shower nozzle; 2, laser channeling; 3, powder channel; 4, the first shielding gas passage; 5, the second shielding gas passage; 6, laser beam; 7, treat the cladding workpiece; 8, cladding layer; 9, the first gas atmosphere inlet.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that protection scope of the present invention is made more explicit defining.
The present embodiment provides a kind of method that improves the laser melting coating effect; when laser melting coating; when laser melting coating; a passage at shower nozzle passes into the mixed gas of helium and nitrogen as shielding gas; another passage at shower nozzle passes into high pressure nitrogen simultaneously as shielding gas, and mixed gas and high pressure nitrogen spray from shower nozzle simultaneously.The air pressure of mixed gas is lower than the air pressure of high pressure nitrogen.In the present embodiment, the air pressure of mixed gas is 1.5～2 normal atmosphere, and the air pressure of high pressure nitrogen is 3～5 normal atmosphere.
Nitrogen is more cheap, but can only prevent oxidation, and anti-oxidant function is not as helium.Helium not only can be anti-oxidant, and inertia is stronger, can prevent other reactions of metal-powder, but expensive.
The protective value of helium is stronger than nitrogen, but finds through contrast, in the mixed gas of nitrogen and helium, if the volume ratio of helium more than 20%, the protective value of this mixed gas and pure helium are very approaching, economy is very strong.
In the present embodiment, in the mixed gas, the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume, and the volume ratio of mixed gas and high pressure nitrogen is greater than 1:3.
Another technical scheme that the present embodiment provides is: a kind of shower nozzle of the method for above-mentioned raising laser melting coating effect; as shown in Figure 1, it has the laser channeling 2 that is opened in these shower nozzle 1 central authorities; be opened in a end around the laser channeling 2 the other end that is connected with a kind of shielding gas adding set and run through the first shielding gas passage 4 of shower nozzle 1 bottom surface; an end that is opened in the first shielding gas passage 4 peripheries the other end that is connected with the powder adding set runs through the powder channel 3 of shower nozzle 1 bottom surface; an end that the is opened in powder channel 3 peripheries the other end that is connected with another kind of shielding gas adding set runs through the second shielding gas passage 5 of shower nozzle 1 bottom surface.
The first shielding gas passage 4 has a plurality of, and evenly distributes around the central shaft of laser channeling 2; The second shielding gas passage 5 has a plurality of, and evenly distributes around the central shaft of laser channeling 2.
One end of the first shielding gas passage 4 is connected with the mixed gas adding set; mixed gas sprays between laser and powder; help to strengthen the homogeneity in powder flow field; the second shielding gas passage 5 is connected with the high pressure nitrogen adding set; high pressure nitrogen helps to strengthen centrality and the convergency in powder flow field in the peripheral ejection of powder.Mixed gas is the mixed gas of helium and nitrogen, and wherein the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.Need to prove, helium and nitrogen can mix first, pass into the first shielding gas passage 4 after being mixed into mixed gas again, also helium and nitrogen can be passed into respectively 4, two kinds of gases of the first shielding gas passage and mix after the shower nozzle ejection.
The size at the place, gas inlet of each first shielding gas passage 4 and the second shielding gas passage 5 is greater than the size of gas outlet, the pressure when ejecting from shower nozzle with increase gas.
Cladding layer surface smoothing under kinds of protect gas covers, without hole and crackle, surface tension is enough, and cladding layer central authorities shrink, and meet the cladding height requirement.
Embodiment two
The difference of the present embodiment and embodiment one is: a kind of shower nozzle of the method for above-mentioned raising laser melting coating effect; such as accompanying drawing 2, it has the laser channeling 2 that is opened in these shower nozzle 1 central authorities; be opened in the first gas atmosphere inlet 9 that the other end laser channeling 2 is connected that is connected with a kind of shielding gas adding set of an end on the shower nozzle 1; be opened in a end around the laser channeling 2 the other end that is connected with the powder adding set and run through the powder channel 3 of shower nozzle 1 bottom surface; an end that the is opened in powder channel 3 peripheries the other end that is connected with another kind of shielding gas adding set runs through the second shielding gas passage 5 of shower nozzle 1 bottom surface.
One end of the first gas atmosphere inlet 9 is connected with the mixed gas adding set, and the second shielding gas passage 5 is connected with the high pressure nitrogen adding set.
The first gas atmosphere inlet 9 with laser channeling 2 connection in the vertical directions apart from shower nozzle 1 bottom surface more than or equal to 5cm; to guarantee that shielding gas forms the stable mobile wind of wind direction within it before the centre gangway ejection; and then guarantee that powder do not rushed in centre gangway, also can guarantee that shielding gas fully mixes with powder simultaneously after central channel injection goes out.
The first gas atmosphere inlet 9 has a plurality of, and evenly distributes around the central shaft of laser channeling 2; The second shielding gas passage 5 has a plurality of, and evenly distributes around the central shaft of laser channeling 2.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present invention and according to this enforcement, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (10)
1. method that improves the laser melting coating effect; it is characterized in that: when laser melting coating; a passage at shower nozzle passes into the mixed gas of helium and nitrogen as shielding gas; another passage at shower nozzle passes into high pressure nitrogen simultaneously as shielding gas, and the air pressure of described mixed gas is lower than the air pressure of high pressure nitrogen.
2. the method for raising laser melting coating effect according to claim 1, it is characterized in that: in the described mixed gas, the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.
3. the method for raising laser melting coating effect according to claim 1, it is characterized in that: the volume ratio of described mixed gas and high pressure nitrogen is greater than 1:3.
4. the method for raising laser melting coating effect according to claim 1, it is characterized in that: the air pressure of described mixed gas is 1.5～2 normal atmosphere, the air pressure of described high pressure nitrogen is 3～5 normal atmosphere.
5. shower nozzle that is used for the method for raising laser melting coating effect claimed in claim 1, it is characterized in that: it has the laser channeling (2) that is opened in this shower nozzle (1) central authorities; be opened in described laser channeling (a 2) the end on every side the other end that is connected with a kind of shielding gas adding set and run through the first shielding gas passage (4) of shower nozzle (1) bottom surface; be opened in the peripheral end of described the first shielding gas passage (4) the other end that is connected with the powder adding set and run through the powder channel (3) of described shower nozzle (1) bottom surface; be opened in the peripheral end of described powder channel (3) the other end that is connected with another kind of shielding gas adding set and run through the second shielding gas passage (5) of shower nozzle (1) bottom surface.
6. shower nozzle according to claim 5; it is characterized in that: an end of described the first shielding gas passage (4) is connected with the mixed gas adding set; described the second shielding gas passage (5) is connected with the high pressure nitrogen adding set; described mixed gas is the mixed gas of helium and nitrogen, and wherein the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.
7. shower nozzle according to claim 5, it is characterized in that: described the first shielding gas passage (4) has a plurality of, and evenly distributes around the central shaft of laser channeling (2); Described the second shielding gas passage (5) has a plurality of, and evenly distributes around the central shaft of laser channeling (2).
8. shower nozzle that is used for the method for raising laser melting coating effect claimed in claim 1, it is characterized in that: it has the laser channeling (2) that is opened in this shower nozzle (1) central authorities; be opened in the upper end of described shower nozzle (1) the first gas atmosphere inlet (9) that the described laser channeling of the other end (2) is connected that is connected with a kind of shielding gas adding set; be opened in described laser channeling (a 2) the end on every side the other end that is connected with the powder adding set and run through the powder channel (3) of described shower nozzle (1) bottom surface; be opened in the peripheral end of described powder channel (3) the other end that is connected with another kind of shielding gas adding set and run through the second shielding gas passage (5) of shower nozzle (1) bottom surface.
9. shower nozzle according to claim 8; it is characterized in that: an end of described the first gas atmosphere inlet (9) is connected with the mixed gas adding set; described the second shielding gas passage (5) is connected with the high pressure nitrogen adding set; described mixed gas is the mixed gas of helium and nitrogen, and wherein the volume of helium accounts for 50% ± 5% of mixed gas cumulative volume.
10. shower nozzle according to claim 8 is characterized in that: described the first gas atmosphere inlet (9) with laser channeling (2) connection in the vertical direction apart from shower nozzle (1) bottom surface more than or equal to 5cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210308815.7A CN102899660B (en) | 2012-08-28 | 2012-08-28 | Method and nozzle improving laser cladding effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210308815.7A CN102899660B (en) | 2012-08-28 | 2012-08-28 | Method and nozzle improving laser cladding effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102899660A true CN102899660A (en) | 2013-01-30 |
| CN102899660B CN102899660B (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210308815.7A Active CN102899660B (en) | 2012-08-28 | 2012-08-28 | Method and nozzle improving laser cladding effect |
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| Country | Link |
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| CN (1) | CN102899660B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979538A (en) * | 2020-07-06 | 2020-11-24 | 江苏大学 | Device and method for improving defects of cladding layer based on eddy current induction technology |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5043548A (en) * | 1989-02-08 | 1991-08-27 | General Electric Company | Axial flow laser plasma spraying |
| EP0503539A1 (en) * | 1991-03-15 | 1992-09-16 | Linde Aktiengesellschaft | Method for the processing of a work piece with a laser |
| US5321228A (en) * | 1991-06-24 | 1994-06-14 | Andreas Krause | Nozzle for the surface treatment of metal workpieces |
| JPH09220682A (en) * | 1996-02-14 | 1997-08-26 | Nkk Corp | Production of duplex stainless steel welded tube |
| CN1612792A (en) * | 2002-01-11 | 2005-05-04 | 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 | Method and installation for laser welding with a n2/he gas mixture, the n2/he content being controlled according to the laser power |
| CN1781611A (en) * | 2004-12-01 | 2006-06-07 | 陈钧 | Multifunctional coaxial laser nozzle |
| CN102164704A (en) * | 2008-09-24 | 2011-08-24 | 乔治洛德方法研究和开发液化空气有限公司 | Method for CO2 laser welding with a dynamic jet nozzle |
-
2012
- 2012-08-28 CN CN201210308815.7A patent/CN102899660B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5043548A (en) * | 1989-02-08 | 1991-08-27 | General Electric Company | Axial flow laser plasma spraying |
| EP0503539A1 (en) * | 1991-03-15 | 1992-09-16 | Linde Aktiengesellschaft | Method for the processing of a work piece with a laser |
| US5321228A (en) * | 1991-06-24 | 1994-06-14 | Andreas Krause | Nozzle for the surface treatment of metal workpieces |
| JPH09220682A (en) * | 1996-02-14 | 1997-08-26 | Nkk Corp | Production of duplex stainless steel welded tube |
| CN1612792A (en) * | 2002-01-11 | 2005-05-04 | 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 | Method and installation for laser welding with a n2/he gas mixture, the n2/he content being controlled according to the laser power |
| CN1781611A (en) * | 2004-12-01 | 2006-06-07 | 陈钧 | Multifunctional coaxial laser nozzle |
| CN102164704A (en) * | 2008-09-24 | 2011-08-24 | 乔治洛德方法研究和开发液化空气有限公司 | Method for CO2 laser welding with a dynamic jet nozzle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111979538A (en) * | 2020-07-06 | 2020-11-24 | 江苏大学 | Device and method for improving defects of cladding layer based on eddy current induction technology |
| CN111979538B (en) * | 2020-07-06 | 2022-04-26 | 江苏大学 | Device and method for improving defects of cladding layer based on eddy current induction technology |
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| Publication number | Publication date |
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| CN102899660B (en) | 2014-07-23 |
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Address after: Wujin District of Jiangsu city in Changzhou province 213164 Chang Wu Road No. 801, Changzhou science and Technology City Tianhong building A block 8 Building Patentee after: CHANGZHOU TIANZHENG INDUSTRIAL DEVELOPMENT CO.,LTD. Address before: Wujin District of Jiangsu city in Changzhou province 213164 Chang Wu Road No. 801, Changzhou science and Technology City Tianhong building A block 8 Building Patentee before: Changzhou Tengen Industry Development Co.,Ltd. |
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