Welding equipment

Abstract

The utility model provides a welding device, which relates to the technical field of laser welding. The welding device provided by the utility model includes: a housing, a device, a laser, a circulation mechanism and an optical component. There are multiple devices; the laser includes a heat sink, which is connected to the housing, and a plurality of installation positions distributed along the circumferential direction are arranged on the circumferential side wall of the heat sink, and the installation positions are used to install the device; a coolant flow channel is arranged in the heat sink; the circulation mechanism is connected to the coolant flow channel of the heat sink, and is used to circulate and supply coolant to the coolant flow channel; the optical component is located in front of the device, and is used to shape the laser generated by the device, so that the light generated by multiple devices converges into an annular light spot.

Description

Technical Field

[0001] The utility model relates to the technical field of laser welding, in particular to a welding device. Background Art

[0002] With the development of society, laser as a cutting-edge technology has been widely used in manufacturing fields such as welding, cutting, cladding, and marking. In particular, handheld laser welding machines have developed rapidly in the welding field due to their small size and flexibility.

[0003] Laser is the core component of welding equipment. The existing fiber laser produces a poor spot welding effect, is costly, and is large in size and inconvenient to hold. Utility Model Content

[0004] The utility model aims to provide a welding device to alleviate the technical problem of poor welding effect of the existing welding equipment.

[0005] The utility model provides a welding device, comprising:

[0006] shell;

[0007] Devices, wherein the number of the devices is multiple;

[0008] A laser, the laser comprising a heat sink, the heat sink being connected to the housing, a plurality of mounting positions distributed along the circumferential direction being arranged on the circumferential side wall of the heat sink, the mounting positions being used to mount the device; a coolant flow channel being arranged in the heat sink;

[0009] A circulation mechanism, the circulation mechanism is connected to the coolant flow channel of the heat sink, and is used for circulating and supplying coolant to the coolant flow channel;

[0010] An optical component is located in front of the device and is used to shape the laser generated by the device so that the light generated by multiple devices converges into a ring-shaped light spot.

[0011] Furthermore, the heat sink includes a base and an end cover, the rear end face of the base is connected to the front end face of the end cover; the rear end face of the end cover is provided with a total inlet and a total outlet;

[0012] The mounting position is arranged on the base; a heat sink is arranged at the mounting position, and the device covers the heat sink; a liquid inlet channel and a liquid outlet channel are arranged in the base, and the number of the liquid inlet channel and the liquid outlet channel is equal to the number of the heat sink; the inlet of the liquid inlet channel is communicated with the rear end face of the base, and the outlet of the liquid inlet channel is communicated with the heat sink; the inlet of the liquid outlet channel is communicated with the heat sink, and the outlet of the liquid outlet channel is communicated with the rear end face of the base;

[0013] The front end surface of the end cover and the rear end surface of the base are correspondingly provided with flow guide structures, so that the total inlet is connected with the inlet of the liquid inlet channel through the flow guide structure, and the total outlet is connected with the outlet of the liquid outlet channel through the flow guide structure.

[0014] Furthermore, a total liquid inlet hole is provided inside the base, the opening of the total liquid inlet hole is provided on the bottom surface of the base and extends toward one side of the top surface of the base, and the inlet of each of the liquid inlet channels is connected to the total liquid inlet hole.

[0015] Furthermore, the base is provided with at least two installation parts distributed along the axial direction, and each of the installation parts is provided with a plurality of installation positions distributed at intervals along the circumferential direction.

[0016] Furthermore, the number of the mounting parts is two, the front mounting part is the first mounting part, and the rear mounting part is the second mounting part; the number of mounting positions on the first mounting part is the same as the number of mounting positions on the second mounting part, and they are aligned front and back in the circumferential direction;

[0017] Of the two installation positions aligned front and back, a radial distance between a front installation position and the central axis of the heat sink is smaller than a radial distance between a rear installation position and the central axis of the heat sink;

[0018] The base is provided with a first slow-axis collimator lens group for receiving light emitted by the device on the first mounting portion; the base is provided with a bracket, and the bracket is provided with a second slow-axis collimator lens group for receiving light emitted by the device on the second mounting portion, and the bracket is used to prevent the second slow-axis collimator lens group from blocking the light emitted by the device on the first mounting portion;

[0019] In the axial direction, the distance between the first slow-axis collimating lens group and the device on the first mounting portion is the same as the distance between the second slow-axis collimating lens group and the device on the second mounting portion.

[0020] Furthermore, the welding equipment also includes an aiming mechanism, which is arranged at the front end of the heat sink, and is used to generate an aiming light, and the aiming light is coaxial with the annular light spot.

[0021] Furthermore, the circulation mechanism includes a liquid inlet pipe and a liquid return pipe, the liquid inlet pipe is connected to the main inlet, and the liquid return pipe is connected to the main outlet;

[0022] The shell is provided with a first limiting groove located behind the main inlet and extending in the front-to-back direction, and a portion of the liquid inlet pipe is located in the first limiting groove; the shell is provided with a second limiting groove located behind the main outlet and extending in the front-to-back direction, and a portion of the liquid return pipe is located in the second limiting groove.

[0023] Furthermore, it also includes a sealing ring, which is arranged between the heat sink and the housing in the radial direction;

[0024] The heat sink and the shell are connected by glue dispensing.

[0025] Furthermore, a cooling fan is installed on the housing, and the cooling fan is located at the rear side of the laser.

[0026] Furthermore, a heat dissipation cover is provided on the outer side cover of the heat dissipation seat, and fins are provided on the outer wall of the heat dissipation cover.

[0027] The utility model has at least the following advantages or beneficial effects:

[0028] The welding equipment provided by the utility model includes: a housing, a device, a laser, a circulation mechanism and an optical component. There are multiple devices; the laser includes a heat sink, the heat sink is connected to the housing, and multiple installation positions distributed along the circumferential direction are arranged on the circumferential side wall of the heat sink, and the installation positions are used to install the device; a coolant flow channel is arranged in the heat sink; the circulation mechanism is connected to the coolant flow channel of the heat sink, and is used to circulate and supply coolant to the coolant flow channel; the optical component is located in front of the device, and is used to shape the laser generated by the device, so that the light generated by multiple devices converges into an annular light spot.

[0029] When the welding equipment is in use, the circulation mechanism can continuously dissipate heat from the heat sink to prevent the device from burning. The light emitted by the circumferentially arranged devices is converged into an annular light spot through the optical component, and the annular light spot has a better welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of a welding device provided in an embodiment of the utility model;

[0032] Figure 2A schematic diagram of the internal structure of a welding device provided by an embodiment of the utility model;

[0033] Figure 3 A schematic diagram of a base of a welding device provided in an embodiment of the utility model;

[0034] Figure 4 A schematic diagram of the rear side of a base of a welding device provided by an embodiment of the utility model;

[0035] Figure 5 for Figure 3 Sectional view along the A-A direction;

[0036] Figure 6 for Figure 3 Cross-sectional view along the B-B direction;

[0037] Figure 7 for Figure 4 Sectional view along the C-C direction;

[0038] Figure 8 A schematic diagram of an end cover of a welding device provided in an embodiment of the utility model;

[0039] Fig. 9 This is a light path diagram of the welding equipment provided in an embodiment of the utility model.

[0040] Icon: 100 - housing; 110 - first limiting groove; 120 - second limiting groove; 200 - device;

[0041] 311 - installation position; 312 - heat sink; 320 - end cover; 321 - main inlet; 322 - main outlet; 323 - through hole; 324 - annular slot;

[0042] 410 - liquid inlet pipe; 420 - liquid return pipe;

[0043] 510 - liquid inlet channel; 520 - liquid outlet channel; 530 - total liquid inlet hole;

[0044] 610 - first mounting portion; 620 - second mounting portion; 700 - bracket; 810 - first slow axis collimator lens group; 820 - second slow axis collimator lens group;

[0045] 910 - aiming mechanism; 920 - cooling fan; 930 - cooling cover. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0050] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] like Figure 1 - Fig. 9 As shown, the welding device provided by the utility model includes: a housing 100, a device 200, a laser, a circulation mechanism and an optical component. In order to facilitate the description of the structure, the end of the device away from the user is the front end, and the end close to the user is the rear end.

[0053] The housing 100 is gun-shaped and has a handle for convenient holding by the user. The housing 100 may be made of plastic.

[0054] The device 200 includes a heat sink and a chip. The heat sink is directly connected to the heat sink, and the chip is mounted on the heat sink.

[0055] The laser is arranged inside the housing 100. The laser includes a heat sink, which is connected to the housing 100 and is substantially cylindrical. A plurality of mounting positions 311 distributed along the circumferential direction are arranged on the circumferential side wall of the heat sink. In this embodiment, the number of mounting positions 311 at the same axial position is 8, that is, the cross-section of the heat sink at this position is a regular octagon.

[0056] The heat sink is provided with a coolant flow channel. The circulation mechanism is connected to the coolant flow channel of the heat sink and is used to circulate coolant to the coolant flow channel. After the coolant flows through the heat sink, it absorbs the heat generated by the device 200, thereby achieving heat dissipation.

[0057] The optical component is located in front of the device 200 and is used to shape the laser generated by the device 200 so that the light generated by multiple devices 200 converges into a ring-shaped light spot.

[0058] When the welding device is in use, the circulation mechanism can continuously dissipate heat from the heat sink to prevent the device 200 from burning. The light emitted by the circumferentially arranged devices 200 is converged into an annular light spot through the optical component, and the annular light spot has a better welding effect.

[0059] Compared with welding equipment with fiber laser, the welding equipment provided in this embodiment has no special requirements on the power supply.

[0060] The heat sink includes a base and an end cover 320 . The rear end surface of the base is connected to the front end surface of the end cover 320 , and a sealing strip may be provided between the two.

[0061] like Figure 2 As shown, the rear end surface of the end cover 320 is provided with a main inlet 321 and a main outlet 322 , and the main inlet 321 and the main outlet 322 are connected to the liquid inlet pipe 410 and the liquid return pipe 420 of the circulation mechanism.

[0062] The installation position 311 is arranged on the base. A heat dissipation slot 312 is arranged at the installation position 311, the heat dissipation slot 312 is recessed inward, the device 200 covers the heat dissipation slot 312, the device 200 and the heat dissipation slot 312 form a flow channel, and the coolant flowing through the heat dissipation slot 312 can directly dissipate the heat of the device 200, resulting in a better heat dissipation effect.

[0063] like Figure 4 - Figure 7 As shown, the base is provided with a liquid inlet channel 510 and a liquid outlet channel 520, the number of the liquid inlet channel 510 and the liquid outlet channel 520 is equal to the number of the heat dissipation slots 312, and a separate liquid inlet and liquid return method is adopted to avoid mutual influence between the channels.

[0064] The inlet of the liquid inlet channel 510 is connected to the rear end face of the base, and the outlet of the liquid inlet channel 510 is connected to the heat dissipation slot 312; the inlet of the liquid outlet channel 520 is connected to the heat dissipation slot 312, and the outlet of the liquid outlet channel 520 is connected to the rear end face of the base; the front end face of the end cover 320 and the rear end face of the base are provided with a guide structure correspondingly, so that the total inlet 321 is connected to the inlet of the liquid inlet channel 510 through the guide structure, and the total outlet 322 is connected to the outlet of the liquid outlet channel 520 through the guide structure. The coolant flowing in from the total inlet 321 first enters the liquid inlet channel 510, then enters the heat dissipation slot 312, then flows out from the liquid outlet channel 520, and finally is discharged from the total outlet 322.

[0065] Specifically, Figure 7 As shown, a total liquid inlet hole 530 is arranged inside the base, and the opening of the total liquid inlet hole 530 is arranged on the bottom surface of the base and extends toward one side of the top surface of the base, and the inlet of each of the liquid inlet channels 510 is connected to the total liquid inlet hole 530.

[0066] For the base, all the coolant flowing in from the end cover 320 enters the total liquid inlet hole 530, and then flows from the total liquid inlet hole 530 into each liquid inlet channel 510. Each liquid outlet channel 520 is arranged in a circle on the circumference of the total liquid inlet hole 530. The total liquid inlet hole 530 and the liquid outlet channel 520 are set in the same liquid inlet manner and the liquid outlet manner respectively, which is convenient for designing the flow guide structure on the end cover 320. Because the liquid inlet is in the middle position and the return liquid is in the outer position, therefore, only one through hole 323 that runs through the front and rear end faces needs to be designed in the middle position of the end cover 320. The through hole 323 is connected to the total liquid inlet hole 530, and an annular groove 324 is set on the front end face of the end cover 320. The annular groove 324 is connected to the total outlet 322 front and back, and the annular groove 324 covers all the liquid outlet channels 520 on the rear end face of the base.

[0067] The mounting position 311 is used to mount the device 200. The number of devices 200 mounted at the same mounting position 311 may be, but is not limited to, one, or may be two. When the number of devices 200 at the same mounting position 311 is two, the liquid inlet flow channel 510 and the liquid outlet flow channel 520 corresponding to the two adjacent and closest heat dissipation slots 312 in two circumferentially adjacent mounting positions 311 are connected.

[0068] The base is provided with at least two mounting parts distributed along the axial direction, and each mounting part is provided with a plurality of mounting positions 311 distributed along the circumferential direction at intervals. When the total number of mounting positions 311 remains unchanged, by increasing the mounting parts, the area of ​​the mounting position 311 on each mounting part can be increased, so as to facilitate the installation of the device 200. Of course, in other feasible solutions, only one mounting part can be arranged on the base.

[0069] Specifically, Fig. 9 As shown, in this embodiment, the number of the mounting parts is two, the front mounting part is the first mounting part 610, and the rear mounting part is the second mounting part 620; the number of mounting positions 311 on the first mounting part 610 is the same as the number of mounting positions 311 on the second mounting part 620, and they are aligned front and back in the circumferential direction, that is, the two front and back aligned mounting positions 311 are arranged in parallel. Among the two front and back aligned mounting positions 311, the radial distance between the front mounting position 311 and the central axis of the heat sink is smaller than the radial distance between the rear mounting position 311 and the central axis of the heat sink, so as to avoid the interference of the light emitted by the former device 200 with the latter device 200.

[0070] The base is provided with a first slow-axis collimator lens group 810 for receiving light emitted by the device 200 on the first mounting portion 610, and the number of the first slow-axis collimator lens groups 810 is consistent with the mounting position 311 on the first mounting portion 610. The base is provided with a bracket 700, and the bracket 700 is provided with a second slow-axis collimator lens group 820 for receiving light emitted by the device 200 on the second mounting portion 620. The bracket 700 is in the shape of a gantry, and the light generated by the device 200 on the first mounting portion 610 can pass through the bracket 700. The bracket 700 is used to raise the second slow-axis collimator lens group 820 to prevent the second slow-axis collimator lens group 820 from blocking the light emitted by the device 200 on the first mounting portion 610. In the axial direction, the distance between the first slow-axis collimator lens group 810 and the device 200 on the first mounting portion 610 is the same as the distance between the second slow-axis collimator lens group 820 and the device 200 on the second mounting portion 620, thereby ensuring the quality of the annular light spot.

[0071] like Figure 7 As shown, the welding equipment further includes an aiming mechanism 910, which is disposed at the front end of the heat sink, and is used to generate an aiming light, which is coaxial with the annular light spot.

[0072] Due to the design of the annular spot, the front end center of the laser has a vacant position that can be used to load the aiming mechanism 910, such as a red light indicator light source. The aiming light is located in the center of the annular spot, which is convenient for auxiliary aiming indication during welding. It can judge whether it is aligned with the welding surface based on the size. The aiming light can also be designed in a "cross shape" (with a circle) for aiming.

[0073] like Figure 2 As shown, the circulation mechanism includes a liquid inlet pipe 410 and a liquid return pipe 420, and the liquid inlet pipe 410 and the liquid return pipe 420 are connected to the pump body and the liquid source. One end of the liquid inlet pipe 410 is connected to the total inlet 321, and one end of the liquid return pipe 420 is connected to the total outlet 322. Due to the shape limitation of the handheld welding equipment, the liquid inlet pipe 410 and the liquid return pipe 420 need to pass through the handle, so the liquid inlet pipe 410 and the liquid return pipe 420 will bend. If the bending position is not restricted, the liquid inlet pipe 410 and the liquid return pipe 420 will bend at the connection with the end cover 320. Long-term bending will cause gaps in the connection, resulting in leakage problems. In order to avoid the above problems, in this embodiment, the housing 100 is provided with a first limiting groove 110 located behind the main inlet 321 and extending in the front-to-back direction, and a part of the liquid inlet pipe 410 is located in the first limiting groove 110; the housing 100 is provided with a second limiting groove 120 located behind the main outlet 322 and extending in the front-to-back direction, and a part of the liquid return pipe 420 is located in the second limiting groove 120. In other words, the first limiting groove 110 first straightens a part of the liquid inlet pipe 410, and then docks with the end cover 320, so that the connection between the end cover 320 and the liquid inlet pipe 410 will not bend, and there will be no leakage problem; similarly, the second limiting groove 120 limits the liquid return pipe 420 to prevent it from bending at the docking point with the end cover 320.

[0074] The welding equipment also includes a sealing ring, which is radially arranged between the heat sink and the housing 100 to play a primary sealing role. The heat sink and the housing 100 are connected by glue to achieve a secondary sealing role, and double sealing to prevent the glue from volatilizing at high temperature and affecting the normal operation of the laser.

[0075] A heat dissipation fan 920 is installed at the rear end of the housing 100 . The heat dissipation fan 920 is located at the rear side of the laser to further improve heat dissipation.

[0076] The outer cover of the heat sink is provided with a heat sink 930 , and fins are provided on the outer wall of the heat sink 930 . The heat sink 930 not only provides protection for the laser, but also dissipates heat through the fins to avoid the accumulation of heat generated by the device 200 .

[0077] In a feasible solution, the welding device further comprises a wire feeding mechanism for automatically feeding the welding wire.

[0078] The optical component may include a convex lens for converging. A protective window is provided at the front end of the optical component to protect other optical lenses, and a dustproof plane lens is also provided to prevent dust from entering the optical component.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A welding device, characterized in that: include: Housing (100); A device (200), wherein the number of the device (200) is plural; A laser, the laser comprising a heat sink, the heat sink being connected to the housing (100), a plurality of mounting positions (311) distributed along the circumferential direction being provided on a circumferential side wall of the heat sink, the mounting positions (311) being used to mount the device (200); a coolant flow channel being provided in the heat sink; A circulation mechanism, the circulation mechanism is connected to the coolant flow channel of the heat sink, and is used for circulating and supplying coolant to the coolant flow channel; An optical component is located in front of the device (200) and is used to shape the laser light generated by the device (200) so that the light generated by a plurality of the devices (200) converges into an annular light spot.

2. The welding device according to claim 1, characterized in that The heat sink comprises a base and an end cover (320), the rear end face of the base being connected to the front end face of the end cover (320); the rear end face of the end cover (320) being provided with a total inlet (321) and a total outlet (322); The installation position (311) is arranged on the base; a heat dissipation groove (312) is arranged at the installation position (311), and the device (200) covers the heat dissipation groove (312); a liquid inlet flow channel (510) and a liquid outlet flow channel (520) are arranged in the base, and the number of the liquid inlet flow channels (510) and the liquid outlet flow channels (520) are equal to the number of the heat dissipation groove (312); the inlet of the liquid inlet flow channel (510) is connected to the rear end face of the base, and the outlet of the liquid inlet flow channel (510) is connected to the heat dissipation groove (312); the inlet of the liquid outlet flow channel (520) is connected to the heat dissipation groove (312), and the outlet of the liquid outlet flow channel (520) is connected to the rear end face of the base; The front end surface of the end cover (320) and the rear end surface of the base are correspondingly provided with flow guide structures, so that the total inlet (321) is connected with the inlet of the liquid inlet channel (510) through the flow guide structure, and the total outlet (322) is connected with the outlet of the liquid outlet channel (520) through the flow guide structure.

3. The welding device according to claim 2, characterized in that: A total liquid inlet hole (530) is provided inside the base, the opening of the total liquid inlet hole (530) is provided on the bottom surface of the base and extends toward one side of the top surface of the base, and the inlet of each of the liquid inlet channels (510) is connected to the total liquid inlet hole (530).

4. The welding device according to claim 2, characterized in that: The base is provided with at least two installation parts distributed along the axial direction, and each of the installation parts is provided with a plurality of installation positions (311) distributed at intervals along the circumferential direction.

5. The welding device according to claim 4, characterized in that There are two mounting parts, the front mounting part is a first mounting part (610), and the rear mounting part is a second mounting part (620); the number of mounting positions (311) on the first mounting part (610) is the same as the number of mounting positions (311) on the second mounting part (620), and they are aligned front to back in the circumferential direction; Of the two installation positions (311) aligned front and back, the radial distance between the front installation position (311) and the central axis of the heat sink is smaller than the radial distance between the rear installation position (311) and the central axis of the heat sink; The base is provided with a first slow-axis collimating lens group (810) for receiving light emitted by the device (200) on the first mounting portion (610); the base is provided with a bracket (700), and the bracket (700) is provided with a second slow-axis collimating lens group (820) for receiving light emitted by the device (200) on the second mounting portion (620); the bracket (700) is used to prevent the second slow-axis collimating lens group (820) from blocking light emitted by the device (200) on the first mounting portion (610); In the axial direction, the distance between the first slow axis collimating lens group (810) and the device (200) on the first mounting portion (610) is the same as the distance between the second slow axis collimating lens group (820) and the device (200) on the second mounting portion (620).

6. The welding device according to claim 1, characterized in that The welding equipment further comprises an aiming mechanism (910), wherein the aiming mechanism (910) is arranged at the front end of the heat sink, and the aiming mechanism (910) is used to generate an aiming light, wherein the aiming light is coaxial with the annular light spot.

7. The welding device according to claim 2, characterized in that: The circulation mechanism comprises a liquid inlet pipe (410) and a liquid return pipe (420), wherein the liquid inlet pipe (410) is connected to the main inlet (321), and the liquid return pipe (420) is connected to the main outlet (322); The housing (100) is provided with a first limiting groove (110) located behind the main inlet (321) and extending in the front-to-back direction, and a portion of the liquid inlet pipe (410) is located in the first limiting groove (110); the housing (100) is provided with a second limiting groove (120) located behind the main outlet (322) and extending in the front-to-back direction, and a portion of the liquid return pipe (420) is located in the second limiting groove (120).

8. The welding device according to claim 1, characterized in that It also includes a sealing ring, which is arranged between the heat sink and the housing (100) in the radial direction; The heat sink and the housing (100) are connected by glue dispensing.

9. The welding device according to claim 1, characterized in that A heat dissipation fan (920) is installed on the housing (100), and the heat dissipation fan (920) is located at the rear side of the laser.

10. The welding device according to claim 1, characterized in that The outer side cover of the heat sink is provided with a heat sink (930), and the outer wall of the heat sink (930) is provided with fins.

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