CN113977084A

CN113977084A - Integrated laser welding head

Info

Publication number: CN113977084A
Application number: CN202111637056.4A
Authority: CN
Inventors: 王乃勇; 王占海
Original assignee: DENOH SEIMITSU ELECTRIC APPLIANCE (BEIJING) CO LTD
Current assignee: DENOH SEIMITSU ELECTRIC APPLIANCE (BEIJING) CO LTD
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-01-28
Anticipated expiration: 2041-12-30
Also published as: CN113977084B

Abstract

The invention discloses an integrated laser welding head, which comprises a laser conduction unit, a collimation focusing unit, a laser welding head unit and a shell, wherein the laser conduction unit comprises an energy transmission optical fiber which is connected with an external laser generator; the collimation and focusing unit can collimate and focus the laser emitted by the laser conduction unit; the laser welding head unit comprises a protection window sheet, and laser passing through the collimation focusing unit can penetrate through the protection window sheet and weld a workpiece to be welded; a cooling channel is arranged in the shell and communicated with an external cooling medium. The laser conduction unit and the laser welding head unit are integrated in the shell, the structure is compact, the space occupied by laser output and laser welding head connection is reduced, the cooling channel is arranged in the shell, and the cooling of each unit in the shell can be realized, so that the reliability of the device is improved; the problem that laser welding cannot be applied to the pipeline with the smaller diameter is solved.

Description

Integrated laser welding head

Technical Field

The invention relates to the technical field of oil and gas pipeline bottoming welding equipment and peripheral supporting facilities thereof, in particular to an integrated laser welding head.

Background

For a pipeline with a small diameter, which is difficult to be repaired by people, the welding failure is reduced, the repair frequency is reduced, backing welding is the most important factor for reducing the welding failure, the backing welding is performed by adopting the existing arc welding, the welding failure rate is difficult to further reduce, and the backing welding becomes the restriction factor for improving the welding efficiency and reducing the welding cost of the oil and gas pipeline with the small diameter.

The sealing performance and the welding line flatness of the laser welding are both advantageous, particularly the stability and the consistency of the laser welding are superior to those of electric arc welding, and the adoption of the laser for backing welding provides a better choice for reducing the failure rate of the backing welding. The back welding of the oil gas pipeline belongs to the tailor welding, the tailor welding is carried out by laser, the flatness and the consistency of the front side of the welding seam are generally superior to those of the back side, therefore, the laser is used for welding from the inside to enable the inner wall of the pipeline to become the welding front side, which is a preferred choice, however, the laser output joints such as QBH joints or QD joints (both are international standard types of laser common output joints) and the like used by the existing high-power laser with optical fiber output and the laser welding joints connected with the QBH joints are large in size and difficult to be installed inside the pipeline for interior welding, particularly for the welding of the oil gas pipeline with smaller diameter which needs to adopt the laser welding, the existing laser output interfaces and the laser welding joints can not meet the requirements, which is a direct reason why the laser welding is not applied to the pipeline interior welding so far, it can be said that the solution to miniaturization of laser output joints and laser welding heads is critical to the ability of laser welding for in-line welding.

Therefore, how to change the current situation that the laser output joint and the laser welding head are not suitable for welding the pipeline with smaller diameter in the prior art becomes a problem to be solved by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide an integrated laser welding head, which aims to solve the problems in the prior art, reduce the occupied space for connecting the laser output and the laser welding head and improve the convenience for welding a pipeline with a smaller diameter.

In order to achieve the purpose, the invention provides the following scheme: the invention provides an integrated laser welding head, comprising:

the laser transmission unit comprises an energy transmission optical fiber, and the energy transmission optical fiber is connected with an external laser generator;

the collimation focusing unit can collimate and focus the laser emitted by the laser conduction unit;

the laser welding head unit comprises a protection window sheet, and laser passing through the collimation focusing unit can penetrate through the protection window sheet and weld a workpiece to be welded;

the energy transmission optical fiber extends into the shell at one end close to the collimation focusing unit, and the collimation focusing unit and the laser welding head unit are both arranged in the shell; a cooling channel is arranged in the shell and communicated with an external cooling medium.

Preferably, the laser conduction unit further comprises an optical fiber fixing component, a cladding optical power stripping region and an end cap, the optical fiber fixing component can fix the energy transmission optical fiber, the energy transmission optical fiber passes through the cladding optical power stripping region to reach the end cap, and laser transmitted by the energy transmission optical fiber can be emitted from the end cap.

Preferably, the collimating and focusing unit includes a collimating lens, a focusing lens and a catadioptric prism, which are sequentially arranged, and the laser transmitted by the laser transmission unit passes through the collimating lens and the focusing lens, and then reaches the laser welding head unit after the direction of the laser is changed by the catadioptric prism.

Preferably, the laser welding head unit further includes a reflector, the reflector is connected to the housing, and a connection position between the reflector and the housing can be adjusted, the reflector can reflect the laser emitted from the collimating and focusing unit to a direction perpendicular to the protection window, the housing has a laser emitting port, and the laser emitting port is opposite to the protection window.

Preferably, a cavity between the protection window sheet and the laser emergent port is communicated with an external protection gas source; the shell is connected with an air pipe quick-plugging connector, the air pipe quick-plugging connector is connected with an air pipe, and the air pipe is communicated with an external protective air source.

Preferably, one side of the protection window piece, which is close to the laser exit port, is provided with a transition ring and a pressing ring, the transition ring and the pressing ring tightly press the protection window piece, the pressing ring is connected with the shell, the side wall of the transition ring is provided with an air inlet, and the air inlet is communicated with the air pipe.

Preferably, the housing is provided with a prism installation cavity, the catadioptric prism is arranged in the prism installation cavity, and a prism cover is arranged at an opening of the prism installation cavity; the bottom of speculum sets up the mirror support, the mirror support with the casing can be dismantled and be connected.

Preferably, the energy transmission optical fiber is connected with the shell by using an optical fiber armouring unit; the optical fiber armor unit comprises an inner tube, an outer armor tube connector assembly and an inner tube connector assembly, the inner tube is sleeved outside the energy transmission optical fiber, the outer armor tube is sleeved outside the inner tube, the outer armor tube is connected with the shell through the outer armor tube connector assembly, the inner tube is connected with the shell through the inner tube connector assembly, and the inner tube connector assembly is located in the shell.

Preferably, the housing is a cylindrical structure with an arc line as a central line, and the laser of the laser welding head unit is emitted from one side of the outer arc surface of the housing.

Preferably, the cooling channels are arranged in parallel to the laser conduction unit, the collimation focusing unit and the laser welding head unit, the number of the cooling channels is two, the two cooling channels are arranged in parallel on two sides of the laser conduction unit, the collimation focusing unit and the laser welding head unit, two ends of the shell are both connected with water pipe quick-plugging connectors, the water pipe quick-plugging connectors are connected with water pipes, and the water pipes are communicated with external cooling media; the shell is of a split structure.

Compared with the prior art, the invention has the following technical effects: the integrated laser welding head comprises a laser conduction unit, a collimation focusing unit, a laser welding head unit and a shell, wherein the laser conduction unit comprises an energy transmission optical fiber which is connected with an external laser generator; the collimation and focusing unit can collimate and focus the laser emitted by the laser conduction unit; the laser welding head unit comprises a protection window sheet, and laser passing through the collimation focusing unit can penetrate through the protection window sheet and weld a workpiece to be welded; one end of the energy transmission optical fiber close to the collimation focusing unit extends into the shell, and the collimation focusing unit and the laser welding head unit are both arranged in the shell; a cooling channel is arranged in the shell and communicated with an external cooling medium.

According to the integrated laser welding head, the laser conduction unit can transmit laser, the collimation and focusing unit enables the laser to be collimated and focused, and the laser finally exits from the protection window sheet of the laser welding head unit and completes welding work; compared with the prior art that high-power laser output interfaces such as standard QBH or QD are used for being connected with a laser welding head through light paths, the problem that laser welding cannot be applied to a pipeline with a small diameter is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of an integrated laser welding head of the present invention;

FIG. 2 is an enlarged schematic view of one end of the integrated laser welding head of the present invention;

FIG. 3 is an enlarged schematic view of the other end of the integrated laser welding head of the present invention;

FIG. 4 is a schematic structural view of a housing of the integrated laser welding head of the present invention;

FIG. 5 is a view taken along line A of FIG. 4;

FIG. 6 is a view taken along line B of FIG. 4;

FIG. 7 is a schematic structural view of a cooling channel of the integrated laser welding head of the present invention;

FIG. 8 is a view taken along line C of FIG. 7;

FIG. 9 is a view from direction D of FIG. 7;

FIG. 10 is a schematic view of a portion of the integrated laser welding head of the present invention;

the optical fiber welding device comprises a laser conduction unit 1, an energy transmission optical fiber 101, an optical fiber fixing component 102, a cladding optical power stripping area 103, an end cap 104, a collimating focusing unit 2, a collimating lens 201, a focusing lens 202, a catadioptric prism 203, a prism cover 204, a laser welding head unit 3, a protection window sheet 301, a reflector 302, a mirror holder 303, a shell 4, a cooling channel 401, a fast air pipe connector 402, an air pipe 403, a transition ring 404, a pressing ring 405, a fast water pipe connector 406, a water pipe 407, a body 408, a sealing plate 409, an air inlet 410, a laser outlet 411, an optical fiber armored unit 5, an inner pipe 501, an outer armored pipe 502, an outer armored pipe connector 503 and an inner pipe connector component 504.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1 to 10, fig. 1 is a schematic structural diagram of an integrated laser welding head of the present invention, fig. 2 is an enlarged structural diagram of one end of the integrated laser welding head of the present invention, fig. 3 is an enlarged structural diagram of the other end of the integrated laser welding head of the present invention, fig. 4 is a structural diagram of a housing of the integrated laser welding head of the present invention, fig. 5 is a view from a direction of fig. 4, fig. 6 is a view from B direction of fig. 4, fig. 7 is a structural diagram of a cooling channel of the integrated laser welding head of the present invention, fig. 8 is a view from C direction of fig. 7, fig. 9 is a view from D direction of fig. 7, and fig. 10 is a partial structural diagram of the integrated laser welding head of the present invention.

The invention provides an integrated laser welding head, which comprises a laser conduction unit 1, a collimation focusing unit 2, a laser welding head unit 3 and a shell 4, wherein the laser conduction unit 1 comprises an energy transmission optical fiber 101, and the energy transmission optical fiber 101 is connected with an external laser generator; the collimation focusing unit 2 can collimate and focus the laser emitted by the laser conduction unit 1; the laser welding head unit 3 comprises a protection window sheet 301, and laser passing through the collimation focusing unit 2 can penetrate through the protection window sheet 301 and weld a workpiece to be welded; one end of the energy transmission optical fiber 101 close to the collimation focusing unit 2 extends into the shell 4, and the collimation focusing unit 2 and the laser welding head unit 3 are both arranged in the shell 4; a cooling passage 401 is provided in the housing 4, and the cooling passage 401 communicates with an external cooling medium.

According to the integrated laser welding head, the laser conduction unit 1 can transmit laser, the collimation and focusing unit 2 enables the laser to be collimated and focused, and the laser finally exits from the protection window piece 301 of the laser welding head unit 3 and completes welding work; compared with the prior art that high-power laser output interfaces such as standard QBH or QD are used for being connected with a laser welding head through light paths, the problem that laser welding cannot be applied to a pipeline with a small diameter is solved.

The laser conducting unit 1 further includes an optical fiber fixing component 102, a cladding optical power stripping region 103, and an end cap 104, the optical fiber fixing component 102 can fix the energy transmission optical fiber 101, the energy transmission optical fiber 101 passes through the cladding optical power stripping region 103 to reach the end cap 104, and laser transmitted by the energy transmission optical fiber 101 can be emitted from the end cap 104. The optical fiber fixing component 102 can fix the position of the energy transmission optical fiber 101 in the shell 4, dislocation of the energy transmission optical fiber 101 in the welding process is avoided, the energy transmission optical fiber 101 can effectively strip residual reflected light in a cladding through the cladding optical power stripping area 103, and finally laser is emitted from the end cap 104.

Specifically, the collimating and focusing unit 2 includes a collimating lens 201, a focusing lens 202, and a catadioptric prism 203, which are sequentially disposed, and the laser light transmitted by the laser transmission unit 1 passes through the collimating lens 201 and the focusing lens 202, and then is changed in direction by the catadioptric prism 203, and reaches the laser welding head unit 3. The laser beam emitted from the end cap 104 has a certain divergence angle, and the diverged laser beam is collimated by the collimator lens 201 and then focused by the focusing lens 202, and the focused laser beam is redirected by the catadioptric prism 203 to be confined inside the housing 4. In this embodiment, the collimating lens 201 is a quartz lens with a focal length of 50mm and a diameter of 30mm, the focusing lens 202 is a quartz lens with a focal length of 200mm and a diameter of 30mm, the included angle between the two inclined surfaces of the catadioptric prism 203 is 60 °, and the thickness and the height are both 30 mm.

Correspondingly, the laser welding head unit 3 further includes a reflector 302, the laser beam passing through the catadioptric prism 203 is reflected by the reflector 302 and then passes through the protection window sheet 301 for emission, in addition, the reflector 302 is connected with the housing 4, the connection position of the reflector 302 and the housing 4 can be adjusted, the position of the reflector 302 can be adjusted conveniently according to specific work requirements, smooth emission of the laser is guaranteed, flexible adaptability of the structure is improved, the reflector 302 can reflect the laser emitted by the collimation focusing unit 2 to the direction perpendicular to the protection window sheet 301, the housing 4 is provided with a laser emitting port 411, the laser emitting port 411 is arranged right opposite to the protection window sheet 301, the laser passes through the protection window sheet 301 and is emitted by the laser emitting port 411, and the protection window sheet 301 is aligned with the collimation focusing unit 2 to provide effective protection.

More specifically, the cavity between the protection window 301 and the laser exit 411 is communicated with an external protection air source; the shell 4 is connected with an air pipe quick-connection plug 402, the air pipe quick-connection plug 402 is connected with an air pipe 403, and the air pipe 403 is communicated with an external protection air source. The gas pipe 403 can deliver the shielding gas to the welding position, and the shielding gas is communicated with the cavity between the shielding window piece 301 and the laser exit 411, so that the shielding gas is prevented from entering the shell 4, and the shielding gas can be ensured to play a role in the laser welding process.

In this embodiment, a transition ring 404 and a pressing ring 405 are disposed on one side of the protection window piece 301 close to the laser exit 411, the transition ring 404 and the pressing ring 405 press the protection window piece 301 tightly, the pressing ring 405 is connected to the housing 4, the transition ring 404 and the pressing ring 405 improve the installation stability of the protection window piece 301, an air inlet 410 is disposed on the side wall of the transition ring 404, the air inlet 410 is communicated with the air pipe 403, and it is ensured that the protection gas smoothly enters the cavity between the protection window piece 301 and the laser exit 411, thereby playing a role in the laser welding process.

In other embodiments of the present invention, the housing 4 has a prism installation cavity, the catadioptric prism 203 is disposed in the prism installation cavity, and the prism cover 204 is disposed at the opening of the prism installation cavity, so as to improve the installation convenience of the catadioptric prism 203; the bottom of the reflector 302 is provided with a mirror holder 303, the mirror holder 303 is detachably connected with the housing 4, in the present embodiment, the reflector 302 is fixed by the mirror holder 303, and the diameter of the mirror holder 303 is 25 mm.

Further, the energy transmission optical fiber 101 is connected with the shell 4 by using the optical fiber armored unit 5; the optical fiber armored unit 5 comprises an inner pipe 501, an outer armored pipe 502, an outer armored pipe joint assembly 503 and an inner pipe joint assembly 504, wherein the inner pipe 501 is sleeved outside the energy transmission optical fiber 101, the outer armored pipe 502 is sleeved outside the inner pipe 501, the outer armored pipe 502 is connected with the shell 4 through the outer armored pipe joint assembly 503, the inner pipe 501 is connected with the shell 4 through the inner pipe joint assembly 504, and the inner pipe joint assembly 504 is located in the shell 4. The optical fiber armored unit 5 improves the convenience and firmness of connection between the energy transmission optical fiber 101 and the shell 4, and ensures the working stability of the device.

It should be emphasized that the housing 4 has a cylindrical structure with an arc center line, and the laser beam of the laser welding head unit 3 is emitted from the outer arc surface side of the housing 4. The central line of the shell 4 is an arc line, the appearance arrangement is more suitable for the arrangement in the pipeline, the space in the pipeline can be effectively utilized, and the adaptability of the device is improved.

Furthermore, the cooling channels 401 are arranged in parallel with the laser conduction unit 1, the collimation focusing unit 2 and the laser welding head unit 3, and the cooling channels 401 are arranged along the connection direction of each unit, so as to avoid the over-high temperature of the parts in the shell 4; in addition, the both ends of casing 4 all are connected with water pipe quick-connect plug 406, and water pipe quick-connect plug 406 is connected with water pipe 407, and water pipe 407 is linked together with external cooling medium, and cooling medium gets into by the water pipe 407 of casing 4 one end, flows out by the other end of casing 4, and when two water pipe 407 of casing 4 one end link to each other, two cooling channel 401 establish ties, and cooling medium gets into by a water pipe 407 of casing 4 one end, still flows out by another water pipe 407 of casing 4 this end. In order to reduce the difficulty of processing, manufacturing and assembling, the shell 4 is of a split structure and comprises a body 408 and a sealing plate 409, a mounting position and a cavity for mounting each unit are processed in the body 408, a cooling cavity is arranged simultaneously, the sealing plate 409 is connected with the body 408, a sealing element is arranged between the sealing plate 409 and the body 408, and the sealing element can be a sealing gasket or sealant, so that the opening of the cooling cavity is plugged, the sealing performance of the cooling channel 401 is improved, and the labor intensity of operators is reduced.

According to the integrated laser welding head, the laser conduction unit 1 can transmit laser, the collimation and focusing unit 2 enables the laser to be collimated and focused, and the laser finally exits from the protection window sheet 301 of the laser welding head unit and completes welding work; compared with the prior art that high-power laser output interfaces such as standard QBH or QD are used for being connected with a laser welding head through light paths, the problem that laser welding cannot be applied to a pipeline with a small diameter is solved. Meanwhile, the shape of the shell 4 is more suitable for the arrangement in the pipeline, the space in the pipeline can be effectively utilized, and the adaptability of the device is improved.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. An integrated laser welding head, comprising:

2. The integrated laser welding head of claim 1 wherein: the laser conduction unit further comprises an optical fiber fixing component, a cladding light power stripping area and an end cap, the optical fiber fixing component can fix the energy transmission optical fiber, the energy transmission optical fiber penetrates through the cladding light power stripping area to reach the end cap, and laser transmitted by the energy transmission optical fiber can be emitted by the end cap.

3. The integrated laser welding head of claim 1 wherein: the collimating and focusing unit comprises a collimating lens, a focusing lens and a reflecting prism which are arranged in sequence, and laser transmitted by the laser transmission unit passes through the collimating lens and the focusing lens, and reaches the laser welding head unit after the direction of the laser is changed by the reflecting prism.

4. The integrated laser welding head of claim 3 wherein: the laser welding head unit further comprises a reflector, the reflector is connected with the shell, the connecting position of the reflector and the shell can be adjusted, the reflector can reflect the laser emitted by the collimation focusing unit to the direction perpendicular to the protection window sheet, the shell is provided with a laser emitting port, and the laser emitting port is right opposite to the protection window sheet.

5. The integrated laser welding head of claim 4 wherein: the cavity between the protection window sheet and the laser emergent port is communicated with an external protection gas source; the shell is connected with an air pipe quick-plugging connector, the air pipe quick-plugging connector is connected with an air pipe, and the air pipe is communicated with an external protective air source.

6. The integrated laser welding head of claim 5 wherein: one side of the protection window piece close to the laser emergent port is provided with a transition ring and a pressing ring, the transition ring and the pressing ring tightly press the protection window piece, the pressing ring is connected with the shell, the side wall of the transition ring is provided with an air inlet, and the air inlet is communicated with the air pipe.

7. The integrated laser welding head of claim 4 wherein: the shell is provided with a prism installation cavity, the catadioptric prism is arranged in the prism installation cavity, and a prism cover is arranged at an opening of the prism installation cavity; the bottom of speculum sets up the mirror support, the mirror support with the casing can be dismantled and be connected.

8. The integrated laser welding head of claim 1 wherein: the energy transmission optical fiber is connected with the shell by using an optical fiber armored unit; the optical fiber armor unit comprises an inner tube, an outer armor tube connector assembly and an inner tube connector assembly, the inner tube is sleeved outside the energy transmission optical fiber, the outer armor tube is sleeved outside the inner tube, the outer armor tube is connected with the shell through the outer armor tube connector assembly, the inner tube is connected with the shell through the inner tube connector assembly, and the inner tube connector assembly is located in the shell.

9. The integrated laser welding head of any of the claims 1 to 8, characterized by: the shell is of a columnar structure with the central line being an arc line, and laser of the laser welding head unit is emitted from one side of the outer arc surface of the shell.

10. The integrated laser welding head of any of the claims 1 to 8, characterized by: the cooling channels are arranged in parallel to the laser conduction unit, the collimation focusing unit and the laser welding head unit, the number of the cooling channels is two, the two cooling channels are arranged on two sides of the laser conduction unit, the collimation focusing unit and the laser welding head unit in parallel, two ends of the shell are both connected with water pipe quick-plugging joints, the water pipe quick-plugging joints are connected with water pipes, and the water pipes are communicated with external cooling media; the shell is of a split structure.