CN102899660B - Method and nozzle improving laser cladding effect - Google Patents
Method and nozzle improving laser cladding effect Download PDFInfo
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- CN102899660B CN102899660B CN201210308815.7A CN201210308815A CN102899660B CN 102899660 B CN102899660 B CN 102899660B CN 201210308815 A CN201210308815 A CN 201210308815A CN 102899660 B CN102899660 B CN 102899660B
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- shower nozzle
- mixed gas
- gas
- shielding gas
- adding set
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000694 effects Effects 0.000 title claims abstract description 18
- 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 20
- 238000000576 coating method Methods 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 20
- 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
- 239000007921 spray Substances 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling 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 laser melting coating effect, belong to field of laser cladding.
Background technology
laser melting coating is 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 being added, and forms the new liquid-metal layer of one deck, treat laser beam through after, the temperature in molten bath reduces, and liquid metal is cooling rapidly, forms the new solid-state cladding layer of one deck in metallic surface.Laser melting coating can change the metallicity of this key position greatly, as hardness, wear resistance, thermotolerance, erosion resistance etc.
for preventing that metal is at high temperature oxidized, design protection gas passage in cladding shower nozzle, injecting protective gas when carrying out laser melting coating, forms shielding gas field not oxidized with protection metal.In prior art, conventionally only use nitrogen as shielding gas, though tool has certain effect, cladding layer air spots is sliding, be full of pore, and because surface tension is inadequate, there is collapse phenomenon on 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 laser melting coating effect.
in order to reach above object; the technical solution used in the present invention is: a kind of method that improves laser melting coating effect; when laser melting coating; the mixed gas that passes into helium and nitrogen at a passage of shower nozzle is as shielding gas; another passage at shower nozzle passes into high pressure nitrogen as shielding gas simultaneously, and the air pressure of mixed gas is lower than the air pressure of high pressure nitrogen.
preferably, in 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, it has the laser channeling that is opened in these shower nozzle central authorities, be opened in laser channeling one end around 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, the one end that is opened in the first shielding gas passage periphery the other end that is connected with powder adding set runs through the powder channel of shower nozzle bottom surface, the one end that is opened in 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 mixed gas adding set; the second shielding gas passage is connected with 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 is uniformly distributed around the central shaft of laser channeling; The second shielding gas passage has a plurality of, and is uniformly distributed 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, 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, one end on shower nozzle, be opened in laser channeling one end around the other end that is connected with powder adding set and run through the powder channel of shower nozzle bottom surface, the one end that is opened in 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 mixed gas adding set; the second shielding gas passage is connected with 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 are more than or equal to 5cm apart from shower nozzle bottom surface.
more preferably, the first gas atmosphere inlet has a plurality of, and is uniformly distributed around the central shaft of laser channeling; The second shielding gas passage has a plurality of, and is uniformly distributed around the central shaft of laser channeling.
owing to having adopted technique scheme, a kind of method and shower nozzle that improves 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 cladding quality; In 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.
Accompanying drawing explanation
accompanying drawing 1 is the structural representation of shower nozzle in the embodiment of the present invention one;
accompanying drawing 2 is the structural representation of shower nozzle in the embodiment of the present 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 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 to more explicit defining.
the present embodiment provides a kind of method that improves laser melting coating effect; when laser melting coating; when laser melting coating; the mixed gas that passes into helium and nitrogen at a passage of shower nozzle is as shielding gas; another passage at shower nozzle passes into high pressure nitrogen as shielding gas simultaneously, and mixed gas and high pressure nitrogen spray simultaneously from shower nozzle.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 anti-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 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 laser channeling 2 one end around 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, the one end that is opened in the first shielding gas passage 4 peripheries the other end that is connected with powder adding set runs through the powder channel 3 of shower nozzle 1 bottom surface, the one end that 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 is uniformly distributed around the central shaft of laser channeling 2; The second shielding gas passage 5 has a plurality of, and is uniformly distributed around the central shaft of laser channeling 2.
one end of the first shielding gas passage 4 is connected with mixed gas adding set; mixed gas sprays between laser and powder; contribute to strengthen the homogeneity in powder flow field; the second shielding gas passage 5 is connected with high pressure nitrogen adding set; high pressure nitrogen, in the peripheral ejection of powder, contributes to strengthen centrality and the convergency in powder flow field.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.It should be noted that, helium and nitrogen can first mix, and pass into the first shielding gas passage 4 after being mixed into mixed gas again, also helium and nitrogen can be passed into respectively to 4, two kinds of gases of the first shielding gas passage and mix from 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 while ejecting from shower nozzle to 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 cladding height requirement.
embodiment bis-
the difference of the present embodiment and embodiment mono-is: a kind of shower nozzle of the method for above-mentioned raising laser melting coating effect, 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, one end on shower nozzle 1, be opened in laser channeling 2 one end around the other end that is connected with powder adding set and run through the powder channel 3 of shower nozzle 1 bottom surface, the one end that 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 mixed gas adding set, and the second shielding gas passage 5 is connected with high pressure nitrogen adding set.
the first gas atmosphere inlet 9 is more than or equal to 5cm with laser channeling 2 connection in the vertical directions apart from shower nozzle 1 bottom surface; to guarantee that shielding gas forms the stable mobile wind of wind direction within it from centre gangway ejection; and then guarantee that powder do not rushed in centre gangway, also can guarantee that shielding gas fully mixes with powder from central channel injection goes out simultaneously.
the first gas atmosphere inlet 9 has a plurality of, and is uniformly distributed around the central shaft of laser channeling 2; The second shielding gas passage 5 has a plurality of, and is uniformly distributed around the central shaft of laser channeling 2.
above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that spirit is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (3)
1. a method that improves laser melting coating effect, it is characterized in that: when laser melting coating, the mixed gas that passes into helium and nitrogen at a passage of shower nozzle is as shielding gas, another passage at shower nozzle passes into high pressure nitrogen as shielding gas simultaneously, the air pressure of described mixed gas is lower than the air pressure of high pressure nitrogen, in described mixed gas, the volume of helium accounts for 20% of mixed gas cumulative volume, described mixed gas and the volume ratio of high pressure nitrogen are greater than 1:3, 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.
2. the shower nozzle 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 (2) one end around 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 one end of described the first shielding gas passage (4) the other end that is connected with powder adding set and run through the powder channel (3) of described shower nozzle (1) bottom surface, be opened in the peripheral one 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, one end of the first described shielding gas passage (4) is connected with mixed gas adding set, the second described shielding gas passage (5) is connected with high pressure nitrogen adding set, described mixed gas is the mixed gas of helium and nitrogen, wherein the volume of helium accounts for 20% of mixed gas cumulative volume, the first described shielding gas passage (4) has a plurality of, and the central shaft around laser channeling (2) is uniformly distributed, the second described shielding gas passage (5) has a plurality of, and is uniformly distributed around the central shaft of laser channeling (2).
3. the shower nozzle 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 first gas atmosphere inlet (9) that laser channeling (2) is connected described in the other end that is connected with a kind of shielding gas adding set, the upper one end of described shower nozzle (1), be opened in described laser channeling (2) one end around the other end that is connected with powder adding set and run through the powder channel (3) of described shower nozzle (1) bottom surface, be opened in the peripheral one 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, one end of described the first gas atmosphere inlet (9) is connected with mixed gas adding set, the second described shielding gas passage (5) is connected with high pressure nitrogen adding set, described mixed gas is the mixed gas of helium and nitrogen, wherein the volume of helium accounts for 20% of mixed gas cumulative volume, described the first gas atmosphere inlet (9) is more than or equal to 5cm with laser channeling (2) connection in the vertical direction apart from shower nozzle (1) bottom surface.
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 CN102899660A (en) | 2013-01-30 |
| CN102899660B true CN102899660B (en) | 2014-07-23 |
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Family Applications (1)
| 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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| CN (1) | CN102899660B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (6)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09220682A (en) * | 1996-02-14 | 1997-08-26 | Nkk Corp | Production of duplex stainless steel welded tube |
-
2012
- 2012-08-28 CN CN201210308815.7A patent/CN102899660B/en active Active
Patent Citations (6)
| 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 |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平9-220682A 1997.08.26 |
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| CN102899660A (en) | 2013-01-30 |
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