CN114535842B - Welding shielding gas cover plate and laser welding shielding gas device - Google Patents
Welding shielding gas cover plate and laser welding shielding gas device Download PDFInfo
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- CN114535842B CN114535842B CN202210192757.XA CN202210192757A CN114535842B CN 114535842 B CN114535842 B CN 114535842B CN 202210192757 A CN202210192757 A CN 202210192757A CN 114535842 B CN114535842 B CN 114535842B
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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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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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
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The application discloses welding protection gas apron and laser welding protection gas device. The welding protection gas cover plate comprises a cover plate body and a gas supply structure; the cover plate body is provided with an edge sealing area and a middle welding area; the edge sealing area is arranged around the middle welding area, and a welding path slot is arranged in the middle welding area; the gas supply structure is arranged along the edge of the middle welding area, and the welding path slot is positioned in an area surrounded by the gas supply structure; the gas supply structure comprises a gas inlet pipeline and a gas outlet pipeline; the air inlet pipeline is arranged in the cover plate body along the edge of the middle welding area, and the air outlet pipeline is communicated to the air inlet pipeline from the lower surface of the cover plate body; the diameter of the gas outlet pipeline is smaller than that of the gas inlet pipeline, so that the flowing speed of the protective gas from the gas outlet pipeline is accelerated, the welding protective gas can be uniformly dispersed and filled in a middle welding area, and the welding area is guaranteed to be flat and uniform after being cooled.
Description
Technical Field
The invention relates to the technical field of welding tool fixtures, in particular to a welding shielding gas cover plate and a laser welding shielding gas device.
Background
In the sealing method of the fuel cell metal bipolar plate, laser welding is used as an efficient and simple connecting scheme and is widely applied to the connecting scheme of the fuel cell metal bipolar plate at home, but various corresponding problems can be caused by the problems of the laser welding. The phenomenon that oxide skin is generated on the surface of a welding seam due to the influence of surrounding air in the laser welding process can be caused, the oxide skin on the surface of the welding seam can cause difficulty in subsequent cleaning and removal, so that the production efficiency of the metal bipolar plate is influenced, the yield of subsequent processes is reduced, the price of the metal bipolar plate of the fuel cell is difficult to reduce, and the popularization of a fuel cell automobile is seriously influenced. In addition, the cooling rate of the welding seam can be increased due to the inner part of the protective gas, and the problem of local deformation of the pole plate caused by welding heat input is reduced.
Disclosure of Invention
The invention aims to provide a welding protective gas cover plate, which is used for solving the technical problem of local deformation caused by uneven cooling rate of a welding position of a polar plate due to uneven distribution of welding protective gas in a welding area caused by diffusion of the welding protective gas in the existing sealing method of a metal bipolar plate of a fuel cell.
In order to achieve the above object, an embodiment of the present invention provides a welding shielding gas cover plate, which includes a cover plate body and a gas supply structure; the cover plate body is provided with an edge sealing area and a middle welding area; the edge sealing area is arranged around the middle welding area, and a welding path slot is arranged in the middle welding area; the gas supply structure is arranged along the edge of the middle welding area, and the welding path slot is positioned in an area surrounded by the gas supply structure; the gas supply structure comprises a gas inlet pipeline and a gas outlet pipeline; the air inlet pipeline is arranged in the cover plate body along the edge of the middle welding area, and the air outlet pipeline is communicated to the air inlet pipeline from the lower surface of the cover plate body; the diameter of the air outlet pipeline is smaller than that of the air inlet pipeline so as to accelerate the flowing speed of the protective gas from the air outlet pipeline.
Furthermore, a surrounding part is arranged in the edge sealing area, the surrounding part protrudes out of the lower surface of the cover plate body, the cross section of the cover plate body is in an inverted U shape, a cavity for storing protective gas is formed by the surrounding part on the lower surface of the cover plate body in a surrounding mode, and the cavity is the middle welding area.
Further, the edge sealing area also comprises: and the sealing rubber strip is arranged on the lower surface of the surrounding part.
Furthermore, the lower surface of the surrounding part is provided with a sealing groove, and the sealing rubber strip is embedded in the sealing groove.
Further, the inlet duct is disposed adjacent to the surrounding portion, the inlet duct is disposed at an equal interval from the surrounding portion, and the shielding gas flowing out of the outlet duct is blocked by the surrounding portion and diffused toward the middle welding region.
Further, the air outlet pipelines are communicated with each other to form an air outlet groove.
Further, within the central weld zone: the first flow blocking block is arranged on the lower surface of the cover plate body and surrounds the welding path groove.
Furthermore, an upper flow guide through hole and a second flow blocking block are further arranged in the middle welding area; the upper diversion through holes are arranged in the middle of the middle welding area in an array manner and penetrate through the cover plate body; the second flow blocking block is arranged on the lower surface of the cover plate body and surrounds the flow guide through hole.
In order to achieve the above object, an embodiment of the present invention further provides a laser welding shielding gas device, which includes the welding shielding gas cover plate and the welding tool described above; the welding tool is arranged below the welding protective gas cover plate and is matched with the welding protective gas cover plate; the welding tool is abutted and sealed with the edge sealing area of the cover plate body, a middle welding area is formed in the edge sealing area in an enclosing mode, and protective gas is filled in the middle welding area; the welding tool is provided with a welding guide groove, and the width of the welding guide groove is larger than that of the welding path groove.
Furthermore, an upper flow guide through hole and a second flow blocking block are also arranged in the middle welding area; the upper diversion through holes are arranged in the middle of the middle welding area in an array manner and penetrate through the cover plate body; the second flow blocking block is arranged on the lower surface of the cover plate body and surrounds the flow guide through hole; the welding tool further comprises, at a position corresponding to the middle welding area: the lower diversion through holes are arranged on the welding tool in an array manner and penetrate through the welding tool; the lower diversion through holes and the upper diversion through holes are correspondingly arranged, and the maximum distance between the outer sides of the two second flow blocking blocks surrounding the upper diversion through holes is smaller than the width of the lower diversion through holes.
The welding protective gas cover plate and the laser welding protective gas device have the advantages that the welding protective gas cover plate is arranged above the welding tool, accelerated protective gas can be provided in the laser welding of the fuel cell metal bipolar plate to fill the middle welding area, the welding protective gas can be uniformly diffused and filled in the middle welding area, the condition that the cooling rate of the welding position of the polar plate is not uniform due to the fact that the welding protective gas is not uniformly distributed is avoided, and the welding area is flat and uniform after being cooled.
Drawings
The following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings, presents the technical solutions and other advantages of the present application.
Fig. 1 is a schematic structural diagram of a first view angle of a welding shielding gas cover plate according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a second view angle of the welding shield gas cover plate according to the embodiment of the present application.
Fig. 3 isbase:Sub>A cross-sectional view ofbase:Sub>A laser welding shielding gas device provided in an embodiment of the present application atbase:Sub>A position corresponding tobase:Sub>A-base:Sub>A of fig. 2.
Fig. 4 is a cross-sectional view of a laser welding shielding gas device provided in an embodiment of the present application at a position corresponding to B-B of fig. 2.
Fig. 5 is a cross-sectional view of a laser welding shielding gas device provided in an embodiment of the present application at a position corresponding to C-C of fig. 2.
The components in the figure are identified as follows:
a welding path slot 1, a surrounding part 2, a sealing rubber strip 3,
a sealing groove 4, a first flow blocking block 5, an upper flow guiding through hole 6,
a second choke block 7, a welding protective gas cover plate 10, a cover plate body 11,
a gas supply structure 12, a welding tool 20, a welding guide groove 21,
lower flow-guiding through-holes 22, shielding gas 30, edge sealing zone 111,
a middle weld area 112, an inlet duct 121, and an outlet duct 122.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
Specifically, referring to fig. 1 to 5, in an embodiment of the present invention, a laser welding shielding gas device is provided, which includes a welding shielding gas cover plate 10 and a welding tool 20.
The welding tool 20 is arranged below the welding shielding gas cover plate 10 and is matched with the welding shielding gas cover plate 10; a welding area is enclosed between the welding tool 20 and the cover plate 10 in a sealing mode, and the welding area is filled with protective gas 30.
The welding protection gas cover plate 10 comprises a cover plate body 11 and a gas supply structure 12; the cover plate body 11 is provided with an edge sealing area 111 and a middle welding area 112; the edge sealing area 111 is arranged around the middle welding area 112, and a welding path slot 1 is arranged in the middle welding area 112; the gas supply structure 12 is arranged along the edge of the middle welding area 112, and the welding path slot 1 is positioned in the area enclosed by the gas supply structure 12; the gas supply structure 12 comprises a gas inlet pipeline 121 and a gas outlet pipeline 122; the air inlet duct 121 is disposed in the cap body 11 along an edge of the middle welding region 112, and the air outlet duct 122 is communicated from a lower surface of the cap body 11 to the air inlet duct 121; the diameter of the outlet pipe 122 is smaller than that of the inlet pipe 121 to accelerate the flow rate of the shielding gas 30 out of the outlet pipe 122. In the figure, the flow direction of the shielding gas 30 is indicated by an arrow.
Specifically, the welding tool 20 abuts against and seals the edge sealing area 111 of the cover plate body 11, a middle welding area 112 is enclosed in the edge sealing area 111, and the middle welding area 112 is filled with the shielding gas 30; the welding tool 20 is provided with a welding guide groove 21, and the width of the welding guide groove 21 is greater than that of the welding path groove 1. In order to reduce the overflow of the shielding gas from the welding path slot 1 of the welding shielding gas cover plate 10 at the welding position of the welding shielding gas cover plate 10, the width of the welding path slot 1 of the welding shielding gas cover plate 10 is especially smaller than the width of the corresponding welding guide slot 21 of the welding tool 20, so that the probability of the overflow of the shielding gas from the upper part can be reduced.
As shown in fig. 3, in the embodiment of the present invention, a surrounding portion 2 is disposed in the edge sealing region 111, the surrounding portion 2 protrudes from the lower surface of the cover plate body 11, the cross section of the cover plate body 11 is in an inverted U shape, and the surrounding portion 2 surrounds a cavity for storing shielding gas 30, which is the middle welding region 112, on the lower surface of the cover plate body 11.
As shown in fig. 3, in the embodiment of the present application, the edge sealing region 111 further includes: and the sealing rubber strip 3 is arranged on the lower surface of the surrounding part 2. Correspondingly, the lower surface of the surrounding part 2 is provided with a sealing groove 4, and the sealing rubber strip 3 is embedded in the sealing groove 4. Welding protection gas apron 10 covers on welding frock 20 with the form of protection gas cover, and the protection gas covers and has the position hole that is used for the location and conveniently dismantles the uniformity of ensureing every clamping, and sealed recess 4 on the protection gas cover compresses tightly through the pressure of protection gas cover self after adding joint strip 3 and plays the effect that prevents the protection gas and spill over from the contact position of welding protection gas apron 10 and welding frock 20.
As shown in fig. 3, in the embodiment of the present application, the inlet duct 121 is disposed adjacent to the surrounding portion 2, the inlet duct 121 is disposed at an equal interval from the surrounding portion 2, and the shielding gas 30 flowing out of the outlet duct 122 is blocked by the surrounding portion 2 and spreads toward the middle welding region 112.
As shown in fig. 2, in the embodiment of the present application, the outlet pipes 122 are communicated with each other to form an outlet trench.
As shown in fig. 5, in the embodiment of the present application, the middle welding area 112 further includes: first choked flow piece 5 is located the lower surface of apron body 11 just encircles welding route groove 1 sets up, can change the protection effect of flow direction promotion gas butt weld with partial gas. Welding path groove 1 of welding protective gas apron 10 with the welding guide way 21 of welding frock 20 corresponds the setting, encircles two of welding path groove 1 sets up the outside maximum distance of first choked block 5 is less than the width of welding guide way 21 to can reduce the protective gas and follow welding path groove 1 play on the welding protective gas apron 10 overflows.
As shown in fig. 4, in the embodiment of the present application, an upper flow guiding through hole 6 and a second flow blocking block 7 are further included in the middle welding region 112; the upper diversion through holes 6 are arranged in the middle of the middle welding area 112 in an array manner and penetrate through the cover plate body 11; the second flow blocking block 7 is arranged on the lower surface of the cover plate body 11 and surrounds the flow guide through hole 6.
As shown in fig. 4, in the embodiment of the present application, the welding tool 20 further includes lower guiding through holes 22 at positions corresponding to the middle welding region 112, and the lower guiding through holes 22 are arranged on the welding tool 20 in an array manner and penetrate through the welding tool 20; the lower diversion through holes 22 are arranged corresponding to the upper diversion through holes 6 to form downward airflow, and the maximum distance between the outer sides of the two second flow blocking blocks 7 arranged around the upper diversion through holes 6 is smaller than the width of the lower diversion through holes 22. In order to reduce the overflow of the shielding gas from the welding path slot 1 on the welding shielding gas cover plate 10 at the welding position on the welding shielding gas cover plate 10, the width of the welding path slot 1 of the welding shielding gas cover plate 10 is especially smaller than the width of the corresponding welding guide slot 21 on the welding tool 20, so that the probability of the overflow of the shielding gas from the upper part can be reduced.
Welding protective gas apron 10 and welding frock 20 are the aluminum alloy material, and the advantage is the quality light, convenient change operation, and does welding protective gas apron 10 with aluminum alloy material's another benefit have the phenomenon that one deck aluminium oxide film melting point is high can not cause to be difficult to the clearance because of splashing the adhesion with the welding for the aluminum alloy material surface. The welding path groove 1 and the welding guide groove 21 of the composite welding tooling plate are formed on the two welding tooling cover plates of the welding protective gas cover plate 10 and the welding tooling 20 which respectively correspond to the fuel cell, so that laser can be conveniently welded through the metal bipolar plate.
The welding protective gas cover plate 10 and the laser welding protective gas device have the advantages that the welding protective gas cover plate 10 is arranged above the welding tool 20, accelerated protective gas 30 can be provided in the laser welding of the fuel cell metal bipolar plate to fill the middle welding area 112, the welding protective gas can be uniformly diffused and filled in the middle welding area 112, the condition that the cooling rate of the welding position of the polar plate is not uniform due to the fact that the welding protective gas is not uniformly distributed is avoided, and the welding area is guaranteed to be flat and uniform after being cooled.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above embodiments of the present application are described in detail, and specific examples are applied in the present application to explain the principles and implementations of the present application, and the description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (7)
1. A laser welding shielding gas device, comprising:
welding a protective gas cover plate; and
the welding tool is arranged below the welding protective gas cover plate and is matched with the welding protective gas cover plate; the welding tool is abutted and sealed with the edge sealing area of the cover plate body, a middle welding area is enclosed in the edge sealing area, and protective gas is filled in the middle welding area; the welding tool is provided with a welding guide groove, and the width of the welding guide groove is larger than that of the welding path groove;
wherein, the welding protection gas apron includes:
the cover plate body is provided with an edge sealing area and a middle welding area; the edge sealing area is arranged around the middle welding area, and a welding path slot is arranged in the middle welding area; and
the gas supply structure is arranged along the edge of the middle welding area, and the welding path slot is positioned in an area surrounded by the gas supply structure; the gas supply structure comprises a gas inlet pipeline and a gas outlet pipeline; the air inlet pipeline is arranged in the cover plate body along the edge of the middle welding area, and the air outlet pipeline is communicated to the air inlet pipeline from the lower surface of the cover plate body; the diameter of the gas outlet pipeline is smaller than that of the gas inlet pipeline so as to accelerate the flowing speed of the protective gas from the gas outlet pipeline;
wherein, still include in the middle part welding area of welding protection gas apron:
the upper flow guide through holes are arranged in the middle of the middle welding area in an array mode and penetrate through the cover plate body; and
the second flow blocking block is arranged on the lower surface of the cover plate body and surrounds the upper flow guide through hole;
the welding tool further comprises, at a position corresponding to the middle welding area:
the lower diversion through holes are arranged on the welding tool in an array manner and penetrate through the welding tool; the lower diversion through hole and the upper diversion through hole are correspondingly arranged, and the maximum distance between the outer sides of the two second flow blocking blocks arranged around the upper diversion through hole is smaller than the width of the lower diversion through hole.
2. The laser welding shielding gas device as recited in claim 1, wherein a surrounding portion is disposed in the edge sealing region, the surrounding portion protrudes from a lower surface of the cover plate body, the cover plate body has an inverted U-shaped cross section, and the surrounding portion surrounds a cavity for storing shielding gas, which is the middle welding region, on the lower surface of the cover plate body.
3. The laser welding shielding gas apparatus of claim 2, further comprising, within the edge seal zone:
and the sealing rubber strip is arranged on the lower surface of the surrounding part.
4. The laser welding shielding gas device of claim 3, wherein a sealing groove is formed on the lower surface of the surrounding portion, and the sealing rubber strip is embedded in the sealing groove.
5. The laser welding shielding gas device as recited in claim 2, wherein the inlet pipe is disposed adjacent to the surrounding portion, the inlet pipe is disposed at an equal distance from the surrounding portion, and the shielding gas flowing from the outlet pipe is blocked by the surrounding portion and spreads toward the middle weld zone.
6. The laser welding shielding gas device of claim 1, wherein the gas outlet pipes are communicated with each other to form a gas outlet groove.
7. The laser welding shielding gas apparatus of claim 1 further comprising, in the central weld area:
the first flow blocking block is arranged on the lower surface of the cover plate body and surrounds the welding path groove.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021114536955 | 2021-12-01 | ||
| CN202111453695 | 2021-12-01 |
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| Publication Number | Publication Date |
|---|---|
| CN114535842A CN114535842A (en) | 2022-05-27 |
| CN114535842B true CN114535842B (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210192757.XA Active CN114535842B (en) | 2021-12-01 | 2022-03-01 | Welding shielding gas cover plate and laser welding shielding gas device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06304777A (en) * | 1993-04-27 | 1994-11-01 | Sanyo Electric Co Ltd | Gas nozzle for welding sealing plate of battery on armor can by laser beam |
| CN101712103A (en) * | 2008-09-30 | 2010-05-26 | 三洋电机株式会社 | Jig for laser welding, laser welding apparatus and method of manufacturing rectangular cell |
| CN206122930U (en) * | 2016-10-27 | 2017-04-26 | 宁波中物东方光电技术有限公司 | Frock clamp blows |
| CN109382584A (en) * | 2017-08-04 | 2019-02-26 | 大族激光科技产业集团股份有限公司 | A kind of laser welding system and method for battery cover board |
| CN212043134U (en) * | 2020-03-19 | 2020-12-01 | 无锡先导智能装备股份有限公司 | Laser seal welding tool |
| CN112719597A (en) * | 2020-12-24 | 2021-04-30 | 浙江启尔机电技术有限公司 | Laser welding tool and welding protection method thereof |
-
2022
- 2022-03-01 CN CN202210192757.XA patent/CN114535842B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06304777A (en) * | 1993-04-27 | 1994-11-01 | Sanyo Electric Co Ltd | Gas nozzle for welding sealing plate of battery on armor can by laser beam |
| CN101712103A (en) * | 2008-09-30 | 2010-05-26 | 三洋电机株式会社 | Jig for laser welding, laser welding apparatus and method of manufacturing rectangular cell |
| CN206122930U (en) * | 2016-10-27 | 2017-04-26 | 宁波中物东方光电技术有限公司 | Frock clamp blows |
| CN109382584A (en) * | 2017-08-04 | 2019-02-26 | 大族激光科技产业集团股份有限公司 | A kind of laser welding system and method for battery cover board |
| CN212043134U (en) * | 2020-03-19 | 2020-12-01 | 无锡先导智能装备股份有限公司 | Laser seal welding tool |
| CN112719597A (en) * | 2020-12-24 | 2021-04-30 | 浙江启尔机电技术有限公司 | Laser welding tool and welding protection method thereof |
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| CN114535842A (en) | 2022-05-27 |
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