CN217316395U

CN217316395U - Laser welding device

Info

Publication number: CN217316395U
Application number: CN202122931081.5U
Authority: CN
Inventors: 黄志华; 李超; 朱星
Original assignee: Wuhan Guangzhi Technology Co ltd
Current assignee: Wuhan Guangzhi Technology Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-08-30
Anticipated expiration: 2031-11-26

Abstract

The utility model relates to a laser welding device, the device comprises a device body, the device body is including being used for the optical fiber beam combiner of the synthetic all the way of pulse laser and continuous laser, the many cladded fiber of being connected with the optical fiber beam combiner and the optical fiber laser optical cable of being connected through many cladded fiber and optical fiber beam combiner, many cladded fiber are including the fibre core of transmission pulse laser and the cladding of transmission continuous laser, and the optical fiber beam combiner will be all the way pulse laser and all the way or the continuous laser of multichannel synthesizes all the way into all the way, and wherein pulse laser is at the center, and continuous laser is in the periphery, is used for the welding through the output of fiber laser optical cable. The nanosecond pulse peak power of the pulse laser at the center is high, the material is broken down to form a molten pool, the light spots of the continuous laser at the periphery are large, the irradiation material raises the temperature of the material to increase the laser absorption rate, the molten pool is homogenized to form smooth welding spots, and therefore the sheet metal welding quality is improved.

Description

Laser welding device

Technical Field

The utility model belongs to the technical field of the laser welding processing technique and specifically relates to a laser welding device is related to.

Background

The sheet metal welding is widely adopted in the industry applications of 3C, new energy and the like.

In the precision welding of thin metal sheets, in order to reduce the thermal influence and ensure the drawing strength, two types of lasers are commonly used, namely quasi-continuous (QCW) laser and nanosecond (MOPA) pulse laser.

QCW lasers and MOPA pulsed lasers are both operated in pulsed mode, with the difference that QCW lasers typically have pulse widths in the range of 50us to 10ms and single pulse energies on the order of joules (J), MOPA pulsed lasers typically have pulse widths in the range of 2ns to 500ns and single pulse energies on the order of millijoules (mJ).

Typical QCW lasers, average power 150W, peak power 1500W. Typical MOPA pulsed laser, average power 200W, peak power 10 kW.

QCW welding adopts a spot welding mode, namely, a single pulse is beaten on a material to be welded, a molten pool is formed after the material is punctured and gradually spreads outwards, the diameter of a welding spot is large, and the surface of the welding spot is smooth; the MOPA pulse laser adopts a spiral line welding mode, namely, laser spots are spirally wound from outside to inside or from inside to outside under the action of a vibrating mirror, the diameter of the formed welding spots is small, but the surface of a molten pool is rough and unsmooth. Both QCW welding and MOPA welding have the problem of metal solution splashing, and are usually inhibited by adopting a ring-shaped light spot or composite welding mode.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a can obtain glossy spot surface that welds is provided, reduces and splashes to improve thin slice metal welding quality's laser welding device.

The utility model discloses the technical scheme who adopts is, a laser welding device, the device comprises a device body, the device body is including being used for combining the optical fiber beam splitter all the way with pulse laser and continuous laser synthesis, the many cladded fiber of being connected with the optical fiber beam splitter and the optical fiber laser optical cable of being connected through many cladded fiber and optical fiber beam splitter, many cladded fiber include the fibre core of transmission pulse laser and the cladding of transmission continuous laser.

The beneficial effects of the utility model are that: by adopting the laser welding device with the structure, the optical fiber beam combiner combines one path of pulse laser and one path or multiple paths of continuous laser into one path, wherein the pulse laser is in the center, the continuous laser is in the periphery, and the output is used for welding through the optical fiber laser optical cable. The nanosecond pulse peak power of the pulse laser at the center is high, the material is punctured to form a molten pool, the light spot of the continuous laser at the periphery is large, the irradiation material improves the temperature of the material to increase the laser absorption rate, and the molten pool is homogenized to form smooth welding spots, so that the welding quality of the sheet metal is improved.

Preferably, the device body further comprises at least one pulse laser for outputting pulse laser and at least one continuous laser for outputting continuous laser, the pulse laser is connected with the optical fiber combiner, and the continuous laser is connected with the optical fiber combiner.

Preferably, the device body further comprises a collimating lens connected with the optical fiber laser optical cable, a vibrating lens connected with the collimating lens and a focusing field lens connected with the vibrating lens.

Preferably, the device body further comprises a first optical fiber and a second optical fiber, the pulse laser is connected with the optical fiber combiner through the first optical fiber, the continuous laser is connected with the optical fiber combiner through the second optical fiber, by adopting the structure, the pulse laser output by the pulse laser is input into the beam combiner through the first optical fiber, and the continuous laser output by the continuous laser enters the optical fiber combiner through the second optical fiber, so that the structure is simple.

Preferably, the model of the first optical fiber is 30/250/NA0.06, the model of the second optical fiber is 105/125/NA0.22, and with the structure, the pulse laser is injected into the optical fiber beam combiner through the 30/250 model optical fiber, and the continuous laser is injected into the optical fiber beam combiner through the 105/125 model optical fiber, so that the good effect on the combination of the two laser beams can be achieved.

Drawings

Fig. 1 is a schematic structural diagram of a laser welding device according to the present invention;

FIG. 2 is a cross-sectional view of a multi-clad optical fiber according to the present invention;

as shown in the figure: 1. a pulsed laser; 2. a continuous laser; 3. an optical fiber combiner; 4. a fiber laser cable; 5. a collimating lens; 6. vibrating the lens; 7. a focusing field lens; 8. a first optical fiber; 9. a second optical fiber; 10. a multi-clad optical fiber; 11. a fiber core; 12. and (7) cladding.

Detailed Description

The invention is further described below with reference to the accompanying drawings in combination with the embodiments so that those skilled in the art can implement the invention with reference to the description, and the scope of the invention is not limited to the embodiments.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular manner of operation, and thus, the terms are not to be construed as limiting the invention.

The utility model relates to a laser welding device, including the device body, as shown in fig. 1, the device body is including being used for combining the optical fiber of pulse laser and continuous laser synthesis all the way and closing bundle ware 3, closing many cladded fiber 10 that bundle ware 3 is connected and closing the optical fiber laser optical cable 4 that bundle ware 3 is connected through many cladded fiber 10 and optic fibre, as shown in fig. 2, many cladded fiber 10 are including the fibre core 11 of transmission pulse laser and the cladding 12 of transmission continuous laser, and the inner cladding of the optical fiber of the many cladded specifically adopting transmits continuous laser.

In the laser welding device with the structure shown in fig. 1, an optical fiber beam combiner 3 combines one path of pulse laser and one path of continuous laser into one path, wherein the pulse laser is in the center, the continuous laser is in the periphery, and the output is used for welding through an optical fiber laser optical cable 4. The nanosecond pulse peak power of the pulse laser at the center is high, the material is broken down to form a molten pool, the light spots of the continuous laser at the periphery are large, the irradiation material raises the temperature of the material to increase the laser absorption rate, the molten pool is homogenized to form smooth welding spots, and therefore the sheet metal welding quality is improved.

The laser after synthesizing through the laser beam combiner is exported through fiber laser optical cable 4, and general fiber laser optical cable 4 has corroded the texturing with filtering covering light on optic fibre, and fiber laser optical cable 4 in this application need not corrode the texturing, need not filter covering light promptly.

After the pulse laser output through the fiber core 11 of the multi-clad fiber 10 is output from the fiber laser cable 4, the divergence angle is small; and continuous laser output through the cladding 12 of the multi-clad fiber 10 is output from the fiber laser cable 4 after being subjected to cladding homogenization, and the divergence angle is large.

As shown in fig. 1, the apparatus body further includes at least one pulse laser 1 for outputting pulse laser and at least one continuous laser 2 for outputting continuous laser, that is, the pulse laser 1 is not limited to one, but may be plural, the continuous laser 2 is not limited to one, or may be plural, the pulse laser 1 is connected to the optical fiber combiner 3, the continuous laser 2 is connected to the optical fiber combiner 3, the pulse laser output by the pulse laser 1 and the continuous laser output by the continuous laser 2 enter the optical fiber combiner 3 at the same time and are combined into one path, and the sheet metal is welded by the combined laser, thereby improving the welding quality of the sheet metal.

The power of the pulse laser 1 and the power of the continuous laser 2 can be independently adjusted; the switching light sequence of the pulse laser and the continuous laser can be set independently, and the power waveform of the continuous laser can be edited to adapt to different material processing technologies.

As shown in fig. 1, the device body further includes a collimating lens 5 connected to the fiber laser cable 4; for example, the spot diameter of the pulse laser is about 6mm after the pulse laser is collimated by using the collimator lens 5 having a focal length of 50mm, and the spot diameter of the continuous laser after the pulse laser is collimated is about 50mm when the NA is 0.2.

As shown in fig. 1, the device body further includes a vibrating lens 6 connected to the collimating lens 5 and a focusing field lens 7 connected to the vibrating lens 6, the synthesized laser enters the collimating lens 5 through the fiber laser optical cable 4 to be collimated, the collimated laser passes through the vibrating lens 6, is welded by sweeping a spiral line through the vibrating lens, and finally converges on the surface of a workpiece to be welded through the focusing field lens 7.

As shown in fig. 1, the apparatus body further includes a first optical fiber 8 and a second optical fiber 9, the pulse laser 1 is connected to the optical fiber combiner 3 through the first optical fiber 8, the continuum laser 2 is connected to the optical fiber combiner 3 through the second optical fiber 9, the model of the first optical fiber 8 is 30/250/NA0.06, and the model of the second optical fiber 9 is 105/125/NA0.22, with this structure, the pulse laser output by the pulse laser 1 is input to the beam combiner through the first optical fiber 8, and the continuum laser output by the continuum laser 2 enters the optical fiber combiner 3 through the second optical fiber 9, which is simple in structure.

Note that the NA of the 250um cladding 12 of the first optical fiber 8 is 0.46, but since the continuous laser light is a nearly single-mode laser light and cannot completely fill the cladding 12, the actual NA is small.

In the application, the pulsed laser breaks down materials on a spiral track for multiple times to form a molten pool, the multi-mode continuous light covers the whole welding spot, the heating is carried out continuously, the small molten pool is prevented from being cooled, molten metal flows, and a smooth welding spot surface is formed.

Claims

1. A laser welding device, includes the device body, its characterized in that: the device body comprises an optical fiber beam combiner (3) for combining pulse laser and continuous laser into one path, a multi-clad optical fiber (10) connected with the optical fiber beam combiner (3) and an optical fiber laser cable (4) connected with the optical fiber beam combiner (3) through the multi-clad optical fiber (10), wherein the multi-clad optical fiber (10) comprises a fiber core (11) for transmitting the pulse laser and a cladding (12) for transmitting the continuous laser.

2. A laser welding apparatus according to claim 1, characterized in that: the device body further comprises at least one pulse laser (1) for outputting pulse laser and at least one continuous laser (2) for outputting continuous laser, the pulse laser (1) is connected with the optical fiber beam combiner (3), and the continuous laser (2) is connected with the optical fiber beam combiner (3).

3. A laser welding apparatus according to claim 1 or claim 2, characterized in that: the device body also comprises a collimating lens (5) connected with the optical fiber laser cable (4), a vibrating lens (6) connected with the collimating lens (5) and a focusing field lens (7) connected with the vibrating lens (6).

4. A laser welding apparatus according to claim 2, characterized in that: the device body further comprises a first optical fiber (8) and a second optical fiber (9), the pulse laser (1) is connected with the optical fiber beam combiner (3) through the first optical fiber (8), and the continuous laser (2) is connected with the optical fiber beam combiner (3) through the second optical fiber (9).

5. A laser welding apparatus according to claim 4, characterized in that: the model of the first optical fiber (8) is 30/250/NA0.06, and the model of the second optical fiber (9) is 105/125/NA 0.22.