CN109332888A - Laser welding system and its working method suitable for water cooling protection - Google Patents
Laser welding system and its working method suitable for water cooling protection Download PDFInfo
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- CN109332888A CN109332888A CN201811178812.XA CN201811178812A CN109332888A CN 109332888 A CN109332888 A CN 109332888A CN 201811178812 A CN201811178812 A CN 201811178812A CN 109332888 A CN109332888 A CN 109332888A
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Classifications
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
- B23K26/703—Cooling arrangements
Abstract
The invention belongs to technical field of welding equipment, and in particular to a kind of laser welding system and its working method suitable for water cooling protection.Wherein this laser welding system includes: Cloud Server and control module, and is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；Wherein the welding mechanism includes: to emit the air current spray nozzle and the high-pressure air source that is connected with air current spray nozzle of the laser emitter of laser beam, housing in transmitting tube side by transmitting tube；The tube wall of the transmitting tube is hollow structure, is suitable for magnetism servo-electric motor water-cooling and is passed through recirculated cooling water into the tube wall of transmitting tube；And the Cloud Server is suitable for storage water cooling parameter, and module is sent to control module by wireless communication, is worked with controlling magnetism servo-electric motor water-cooling, to reduce the temperature of transmitting tube, improves the service life of laser emitter.
Description
Technical field
The present invention relates to technical field of welding equipment, and in particular to it is a kind of suitable for water cooling protection laser welding system and its
Working method.
Background technique
Laser welding is exactly to make it butt welding in shaft flange attaching laser emitter of welding mechanism etc. to be directed at weldment
Fitting welded, cut or thermal spraying, power, focal length and stability of laser beam etc. will affect welding quality, especially shadow
Ring heat affected area range and size, the depth in molten bath etc..Since the heat of laser beam is larger, if making for a long time in the welding process
With tending to cause transmitting tube overheat even to damage, this makes laser welding mostly use segmentation to weld greatly in the long weld seam of soldering
It connects, reduces the service life of production efficiency and laser emitter.
Summary of the invention
The object of the present invention is to provide a kind of laser welding systems and its working method suitable for water cooling protection, pass through water cooling
Mechanism is passed through recirculated cooling water into the tube wall of transmitting tube, to reduce the temperature of transmitting tube, improves its service life.
In order to solve the above-mentioned technical problems, the present invention provides a kind of laser welding systems, comprising: Cloud Server and control
Module, and it is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；Wherein the welding mechanism includes: to pass through transmitting
The air current spray nozzle and the high pressure gas that is connected with air current spray nozzle of the pipe transmitting laser emitter of laser beam, housing in transmitting tube side
Source；The tube wall of the transmitting tube is hollow structure, is suitable for magnetism servo-electric motor water-cooling and is passed through recirculated cooling water into the tube wall of transmitting tube；With
And the Cloud Server is suitable for storage water cooling parameter, and module is sent to control module by wireless communication, to control water cooling unit
Structure works.
Further, the wireless communication module includes: a double-frequency double-circularly-poantenna antenna；The wherein dual-band dual-circular polarization day
Line includes: left-hand metamaterial, omnidirectional double-frequency linear polarized antenna and sky therebetween positioned at left-hand metamaterial upper surface
Gas matching layer；The left-hand metamaterial includes: first medium substrate, and is located at the upper and lower surfaces of first medium substrate
Metal unit array, metal layer；From top to bottom, from left to right arranged with the metal unit array by several metal units and
At.
Further, the metal unit includes: two rectangular metal portions being centrosymmetric, i.e. the first, second rectangle gold
Category portion；The rectangular metal portion includes: dual U-shaped arm and the L shape resonant patch that is arranged on the outside of dual U-shaped arm；The dual U-shaped arm packet
It includes: the first, second end to end U-shaped arm；The tail end of first U-shaped arm and the head end of the second U-shaped arm are vertically connected；And
The head end of first U-shaped arm in two rectangular metal portions is suitable for extending connection to the symmetrical centre in two rectangular metal portions.
Further, each metal unit is suitable for left and right parallelly distribute on, and the second rectangular metal portion is located at adjacent metal unit
The underface in the first rectangular metal portion.
Further, it is straight to be located at same for the center of the geometric center of the left-hand metamaterial and omnidirectional double-frequency linear polarized antenna
On line.
Further, the omnidirectional double-frequency linear polarized antenna is the sub- printed antenna of planar monopole of coplanar wave guide feedback.
Further, the sub- printed antenna of the planar monopole includes: second medium substrate, is located on second medium substrate
The first, second, and third rectangular metal irradiation unit on surface and polygon metal radiation portion；Polygon metal radiation portion
It for center symmetrical structure, and include: irregular pentagon hollow metal patch, H-shaped hollow out radiating element and inverted U-shaped resonant slit
Gap；The third rectangular metal irradiation unit is suitable for passing through from the gap of the first, second rectangular metal irradiation unit, so that one end connects
The vertex of irregular pentagon hollow metal patch is connect, the other end is connect with the middle part of a side of second medium substrate；With
And first, second rectangular metal irradiation unit be located on two corners of this side.
Further, the second medium substrate is suitable for using polytetrafluoroethylene (PTFE) single-side coated copper plate, with a thickness of 0.8 ~
0.9mm, dielectric constant are 4 ~ 5.
Further, the left-hand metamaterial with a thickness of 0.015 ~ 0.020mm；And
The dielectric constant of the first medium substrate is 4 ~ 5.
Another aspect, the present invention also provides a kind of working methods of laser welding system, comprising: Cloud Server and control
Module, and it is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；The Cloud Server is suitable for storage water cooling parameter,
And module is sent to control module by wireless communication, carries out water cooling protection to control magnetism servo-electric motor water-cooling butt welding machine structure.
The invention has the advantages that laser welding system of the invention is led to when welding mechanism carries out gas shielded arc welding
It crosses magnetism servo-electric motor water-cooling and is passed through recirculated cooling water into the tube wall of transmitting tube, to reduce the temperature of transmitting tube, can not only extend laser
The duration of welding can also improve the service life of laser emitter；In addition, water cooling parameter is stored by Cloud Server,
And control module is sent to by wireless communication module, reduce welding process to the dependency degree of people, improve the degree of automation and
Production efficiency.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the functional block diagram of laser welding system of the invention；
Fig. 2 is the structural schematic diagram of double-frequency double-circularly-poantenna antenna of the invention；
Fig. 3 is the structural schematic diagram of left-hand metamaterial of the invention；
Fig. 4 is the structural schematic diagram of metal unit of the invention；
In figure: left-hand metamaterial 1, omnidirectional double-frequency linear polarized antenna 2, second medium substrate 21, the first rectangular metal irradiation unit 22,
Second rectangular metal irradiation unit 23, third rectangular metal irradiation unit 24, polygon metal radiation portion 25, irregular pentagon is hollow
Metal patch 251, H-shaped hollow out radiating element 252, inverted U-shaped resonant slot 253, first medium substrate 3, metal unit 4, first
Rectangular metal portion 41, the second rectangular metal portion 42, the first U-shaped arm 421, the second U-shaped arm 422, L shape resonant patch 423.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
Embodiment 1
Fig. 1 is the functional block diagram of laser welding system of the invention.
As shown in Figure 1, the present embodiment 1 provides a kind of laser welding system, comprising: Cloud Server and control module, with
And it is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；Wherein the welding mechanism includes: to be emitted by transmitting tube
The air current spray nozzle and the high-pressure air source that is connected with air current spray nozzle of the laser emitter of laser beam, housing in transmitting tube side；It is described
The tube wall of transmitting tube is hollow structure, is suitable for magnetism servo-electric motor water-cooling and is passed through recirculated cooling water into the tube wall of transmitting tube；And it is described
Cloud Server is suitable for storage water cooling parameter, and module is sent to control module by wireless communication, to control magnetism servo-electric motor water-cooling progress
Work.Specifically, being equipped with entery and delivery port at the tube wall of transmitting tube；The magnetism servo-electric motor water-cooling includes but is not limited to water pump, water inlet
End is connected with the water storage box of recirculated cooling water, and water outlet is connected with the water inlet of transmitting tube, to lead in the tube wall to transmitting tube
Enter recirculated cooling water；And the water outlet of the transmitting tube is connected by outlet pipe with water storage box, and recirculated cooling water is exported
Transmitting tube reduces its temperature to take away the heat of transmitting tube by recirculated cooling water.
Optionally, the air current spray nozzle is connected by gas pipeline with high-pressure air source, and in high-pressure air source and gas pipeline
Junction be equipped with electromagnetic valve, for controlling the size of throughput.When being welded, first opens electromagnetic valve and spray protection
After 30 ~ 50s of gas, the air around weld seam is discharged, is then then turned on laser transmitter projects laser beam and is welded.
Optionally, the Cloud Server can remotely be controlled by a PC machine, to input to Cloud Server and store water cooling
Parameter；And the water cooling parameter includes but is not limited to: the power of water pump；And the water pump power and laser beam power
It is positively correlated, the power that water pump can be adjusted by control module realizes that the water of recirculated cooling water increases or reduces, and can both protect
The normal working temperature for demonstrate,proving transmitting tube, prevents its damage, and can be excessive to avoid water, waste of energy.
Optionally, the control module is such as, but not limited to 51 single-chip microcontrollers, can be controlled and be swashed by corresponding driving circuit
Optical transmitting set, electromagnetic valve, water pump work.
The laser welding system of the present embodiment 1 is when welding mechanism carries out gas shielded arc welding, by magnetism servo-electric motor water-cooling to transmitting
It is passed through recirculated cooling water in the tube wall of pipe, to reduce the temperature of transmitting tube, can not only extend the duration of laser welding, also
The service life of laser emitter can be improved；In addition, storing water cooling parameter by Cloud Server, and sent out by wireless communication module
It send to control module, reduces welding process to the dependency degree of people, improve the degree of automation and production efficiency.
Fig. 2 is the structural schematic diagram of double-frequency double-circularly-poantenna antenna of the invention.
Fig. 3 is the structural schematic diagram of left-hand metamaterial of the invention.
A kind of optional embodiment as double-frequency double-circularly-poantenna antenna.
See that Fig. 2 and Fig. 3, the wireless communication module include: a double-frequency double-circularly-poantenna antenna；The wherein double entelechies of the double frequency
Change antenna include: left-hand metamaterial 1, positioned at 1 upper surface of left-hand metamaterial omnidirectional double-frequency linear polarized antenna 2 and between the two it
Between air matching layer (positioned at the lower surface of omnidirectional double-frequency linear polarized antenna, not shown in Fig. 2)；The left-hand metamaterial 1
Include: first medium substrate 3, and is located at metal unit array, the metal layer of the upper and lower surfaces of first medium substrate 3
(positioned at the lower surface of first medium substrate, not shown in Fig. 3)；With the metal unit array by several metal units 4 from
Top to bottm from left to right arranges.
Optionally, the left-hand metamaterial 1 with a thickness of 0.015 ~ 0.020mm, preferably 0.018mm；And described
The dielectric constant of one medium substrate is 4 ~ 5, preferably 4.6.
The double-frequency double-circularly-poantenna antenna of present embodiment is used cooperatively by left-hand metamaterial and omnidirectional double-frequency linear polarized antenna,
By the metal unit of left-hand metamaterial from top to bottom, from left to right arrange (as shown in Figure 3), can be realized left-hand circular polarization wave with
Right-handed circular polarization wave forms circular polarized antenna, enormously simplifies double-frequency double-circularly-poantenna antenna while optimizing antenna performance
Design difficulty further improves the gain of double-frequency double-circularly-poantenna antenna, to improve the radiation of water cooling parameter as transmitting signal
Intensity and radiation scope guarantee that control module accurately receives water cooling parameter, popular, simple process, flexible design, function with structure
The features such as energy property is strong.
Fig. 4 is the structural schematic diagram of metal unit of the invention.
A kind of optional embodiment as metal unit.
See Fig. 4, the metal unit 4 includes: two rectangular metal portions being centrosymmetric, i.e. the first rectangular metal portion
41, the second rectangular metal portion 42, and the structure in two rectangular metal portions is identical.Specifically, existing with the second rectangular metal in Fig. 4
For 42, the structure of metal unit 4 is illustrated, i.e., second rectangular metal portion 42 includes: that dual U-shaped arm and setting exist
L shape resonant patch 423 on the outside of dual U-shaped arm；The dual U-shaped arm includes: the first, second end to end U-shaped arm, and the first U
The open end of shape arm 421 is towards central symmetry (in Fig. 4 top), and the open end of the second U-shaped arm 422 is towards the first U-shaped arm 421
(right side in Fig. 4)；The tail end of first U-shaped arm 421 and the head end of the second U-shaped arm 422 are vertically connected；And two rectangle gold
The head end of first U-shaped arm 421 in category portion is suitable for extending connection to the symmetrical centre in two rectangular metal portions.
Optionally, in single metal unit, there is first between two L shape resonant patch and corresponding dual U-shaped arm
Gap, and the center in two the first gaps and the center of circle (intersection of the extended line of L shape resonant patch) of annulus form a L shape
Broken line.
Optionally, each metal unit 4 is suitable for left and right parallelly distribute on；Second rectangular metal portion 42 is located at adjacent metal unit 4
The first rectangular metal portion 41 underface, and there are the second gaps between the first rectangular metal portion 41.
The metal unit of present embodiment not only can be improved by two rectangular metal portions about center symmetric setting
The gain of antenna, the second rectangular metal portion that is also convenient for are arranged in the underface in the first rectangular metal portion of adjacent metal unit, with
Realize that metal unit from top to bottom, from left to right arranges, thus guarantee that the load of left-hand metamaterial is capable of forming circular polarized antenna,
Improve the radiation intensity and radiation scope of water cooling parameter.
Further, the center of the geometric center of the left-hand metamaterial 1 and omnidirectional double-frequency linear polarized antenna 2 is located at same
On straight line.
A kind of optional embodiment as the sub- printed antenna of planar monopole.
Further, the omnidirectional double-frequency linear polarized antenna 2 can be the sub- printed antenna of planar monopole of coplanar wave guide feedback.
See Fig. 2, the sub- printed antenna of planar monopole includes: second medium substrate 21, is located at second medium substrate
The first rectangular metal irradiation unit 22, the second rectangular metal irradiation unit 23 and the third rectangular metal irradiation unit 24 of 21 upper surfaces and
Polygon metal radiation portion 25；Polygon metal radiation portion 25 is center symmetrical structure, and includes: in irregular pentagon
Empty metal patch 251, H-shaped hollow out radiating element 252 and inverted U-shaped resonant slot 253；The third rectangular metal irradiation unit 24 is suitable
It is passed through in from the gap of the first, second rectangular metal irradiation unit, so that one end connects irregular pentagon hollow metal patch
251 vertex, the other end are connect with the middle part of a side of second medium substrate 21；And the first, second rectangular metal spoke
The portion of penetrating is located on two corners of this side.
Optionally, see that Fig. 2, the H-shaped hollow out radiating element 252 are made of the first, second, and third engraved structure, wherein
First, second engraved structure is arranged in parallel (being to be arranged in parallel in Fig. 2 vertically), and third engraved structure is arranged first, second
The centre of engraved structure, the first, second engraved structure are vertical with third engraved structure.
Optionally, there is air matching layer between the lower surface of second medium substrate 21 and the upper surface of first medium substrate 3.
Optionally, the second medium substrate 21 is suitable for using polytetrafluoroethylene (PTFE) single-side coated copper plate, with a thickness of 0.8 ~
0.9mm, preferably 0.86mm；Dielectric constant is 4 ~ 5, preferably 4.6.
First medium substrate, second medium substrate and left-hand metamaterial in the application have the limit of thickness and dielectric constant
System.If thickness is too big, the overall dimensions of antenna are not only influenced, it is also possible to cause metal layer to cause to be electromagnetically shielded, influence antenna
Gain effect；If thickness is too small, the intensity of antenna will affect, can be easy to bend, to influence normal mounting use, or even change
The gain of change of weather line.
The sub- printed antenna of the planar monopole of present embodiment passes through be arranged on second medium substrate first, second and the
Three rectangular metal irradiation units and polygon metal radiation portion are used cooperatively, and are improved the gain-state of antenna, be ensure that water cooling
The radiation intensity and radiation scope of parameter improve the reception accuracy of control module, improve the response of laser welding system
Speed.
In conclusion the laser welding system of the application passes through magnetism servo-electric motor water-cooling when welding mechanism carries out gas shielded arc welding
It is passed through recirculated cooling water into the tube wall of transmitting tube, to reduce the temperature of transmitting tube, can not only extend continuing for laser welding
Time can also improve the service life of laser emitter；In addition, storing water cooling parameter by Cloud Server, and by channel radio
Letter module is sent to control module, reduces welding process to the dependency degree of people, improves the degree of automation and production efficiency；It is double
Frequency dual-circle polarization antenna is used cooperatively by left-hand metamaterial and omnidirectional double-frequency linear polarized antenna, by the metal unit of left-hand metamaterial
From top to bottom, (as shown in Figure 3) from left to right is arranged, can be realized left-hand circular polarization wave and right-handed circular polarization wave, form entelechy
Change antenna, the design difficulty of double-frequency double-circularly-poantenna antenna is enormously simplified while optimizing antenna performance, is further improved
The gain of double-frequency double-circularly-poantenna antenna guarantees control to improve water cooling parameter as the radiation intensity and radiation scope of transmitting signal
Molding block accurately receives water cooling parameter, has the characteristics that popular structure, simple process, flexible design, functional；Planar monopole
Sub- printed antenna passes through the first, second, and third rectangular metal irradiation unit being arranged on second medium substrate and polygon gold
Belong to irradiation unit to be used cooperatively, improve the gain-state of antenna, ensure that the radiation intensity and radiation scope of water cooling parameter, improves
The reception accuracy of control module, improves the response speed of laser welding system.
Embodiment 2
On the basis of embodiment 1, the present embodiment 2 provides a kind of working method of laser welding system, comprising: Cloud Server
And control module, and it is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；The Cloud Server is suitable for storage water
Cold parameter, and module is sent to control module by wireless communication, carries out water cooling protection to control magnetism servo-electric motor water-cooling butt welding machine structure.
Specific structure and implementation process about laser welding system are discussed referring to the correlation of embodiment 1, no longer superfluous herein
It states.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of laser welding system characterized by comprising
Cloud Server and control module, and it is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；Wherein
The welding mechanism include: by transmitting tube emit the laser emitter of laser beam, housing transmitting tube side air-flow
Nozzle and the high-pressure air source being connected with air current spray nozzle；
The tube wall of the transmitting tube is hollow structure, is suitable for magnetism servo-electric motor water-cooling and is passed through recirculated cooling water into the tube wall of transmitting tube；
And
The Cloud Server is suitable for storage water cooling parameter, and module is sent to control module by wireless communication, to control water cooling
Mechanism works.
2. laser welding system according to claim 1, which is characterized in that
The wireless communication module includes: a double-frequency double-circularly-poantenna antenna；Wherein
The double-frequency double-circularly-poantenna antenna includes: left-hand metamaterial, the omnidirectional double-frequency linear polarization positioned at left-hand metamaterial upper surface
Antenna and air matching layer therebetween；
The left-hand metamaterial includes: first medium substrate, and is located at the metal list of first medium substrate upper and lower surfaces
Element array, metal layer；And
The metal unit array from top to bottom, is from left to right arranged by several metal units.
3. laser welding system according to claim 2, which is characterized in that
The metal unit includes: two rectangular metal portions being centrosymmetric, i.e. the first, second rectangular metal portion；
The rectangular metal portion includes: dual U-shaped arm and the L shape resonant patch that is arranged on the outside of dual U-shaped arm；
The dual U-shaped arm includes: the first, second end to end U-shaped arm；
The tail end of first U-shaped arm and the head end of the second U-shaped arm are vertically connected；And
The head end of first U-shaped arm in two rectangular metal portions is suitable for extending connection to the symmetrical centre in two rectangular metal portions.
4. laser welding system according to claim 3, which is characterized in that
Each metal unit is suitable for left and right parallelly distribute on, and the second rectangular metal portion is located at the first rectangular metal of adjacent metal unit
The underface in portion.
5. laser welding system according to claim 2, which is characterized in that
The geometric center of the left-hand metamaterial and the center of omnidirectional double-frequency linear polarized antenna are located on the same line.
6. laser welding system according to claim 5, which is characterized in that
The omnidirectional double-frequency linear polarized antenna is the sub- printed antenna of planar monopole of coplanar wave guide feedback.
7. laser welding system according to claim 6, which is characterized in that
The sub- printed antenna of planar monopole includes: second medium substrate, be located at second medium upper surface of base plate first,
Second and third rectangular metal irradiation unit and polygon metal radiation portion；
Polygon metal radiation portion is center symmetrical structure, and includes: that irregular pentagon hollow metal patch, H-shaped are engraved
Empty radiating element and inverted U-shaped resonant slot；
The third rectangular metal irradiation unit is suitable for passing through from the gap of the first, second rectangular metal irradiation unit, so that one end
The vertex of irregular pentagon hollow metal patch is connected, the other end is connect with the middle part of a side of second medium substrate；
And
First, second rectangular metal irradiation unit is located on two corners of this side.
8. laser welding system according to claim 7, which is characterized in that
The second medium substrate is suitable for using polytetrafluoroethylene (PTFE) single-side coated copper plate, and with a thickness of 0.8 ~ 0.9mm, dielectric constant is
4~5。
9. laser welding system according to claim 2, which is characterized in that
The left-hand metamaterial with a thickness of 0.015 ~ 0.020mm；And
The dielectric constant of the first medium substrate is 4 ~ 5.
10. a kind of working method of laser welding system characterized by comprising
Cloud Server and control module, and it is connected to the control module welding mechanism and magnetism servo-electric motor water-cooling respectively；
The Cloud Server is suitable for storage water cooling parameter, and module is sent to control module by wireless communication, to control water cooling
Mechanism butt welding machine structure carries out water cooling protection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811178812.XA CN109332888A (en) | 2018-10-10 | 2018-10-10 | Laser welding system and its working method suitable for water cooling protection |
| PCT/CN2018/110149 WO2020073340A1 (en) | 2018-10-10 | 2018-10-12 | Laser welding system employing protective water-cooling and operating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811178812.XA CN109332888A (en) | 2018-10-10 | 2018-10-10 | Laser welding system and its working method suitable for water cooling protection |
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| Publication Number | Publication Date |
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| CN109332888A true CN109332888A (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811178812.XA Pending CN109332888A (en) | 2018-10-10 | 2018-10-10 | Laser welding system and its working method suitable for water cooling protection |
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| Country | Link |
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| WO (1) | WO2020073340A1 (en) |
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| CN107134654A (en) * | 2017-04-21 | 2017-09-05 | 南京航空航天大学 | Double-frequency double-circularly-poantenna antenna and its performance implementation method based on the super surface of electromagnetism |
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