Laser welding head

Abstract

The utility model relates to a laser welding head which comprises an optical fiber connector, a collimation module, a reflection module, a spectroscope module and a focus lens module which are sequentially connected in the emergent direction of a light path, the laser welding head further comprises a focusing module, a main shaft air injection module and a paraxial air injection module, and the focus lens module is in sliding connection with the spectroscope module through the focusing module; the main shaft air injection module and the focus lens module are coaxially arranged. The main shaft air injection module comprises a conical sleeve and a main shaft nozzle. The paraxial air injection module comprises a connecting piece and a paraxial air injection pipe, one end of the connecting piece is connected with the paraxial air injection pipe, and the other end is rotationally connected with the joint of the air knife and the conical sleeve. According to the laser welding head, protective gas can be blown from the coaxial direction and the lateral direction at the same time, the protective effect is better, complex welding conditions can be dealt with, the focal length of the focus lens module is adjustable, the energy requirements of different welding materials can be met, the whole laser welding head does not need to be replaced, and the welding efficiency can be improved.

Description

Technical Field

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

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. It uses the high energy of the laser beam to instantly melt the welding material to achieve welding. It has the advantages of fast welding speed, high welding quality, wide application range, and small heat-affected zone. It is widely used in many fields.

[0003] The laser welding head is one of the main components of the laser welding equipment. It emits a laser beam through the laser optical path to weld the workpiece. During the laser welding process, it is necessary to simultaneously blow a shielding gas into the welding area for protection. In the structure of the laser welding head in the prior art, a coaxial blowing structure is mostly used when blowing in shielding gas. For example, CN213318416U discloses a coaxial blowing device for laser welding, including a blowing device body, a locking shell is provided at the lower end of the blowing device body, an annular clamp is fixedly sleeved on the outer surface of the locking shell, and the lower surfaces of the front and rear sides of the annular clamp are respectively fixedly connected with connecting blocks, and the two connecting blocks are respectively rotatably connected with flip blocks. In addition, a side-axis blowing method of shielding gas is also adopted, that is, a blowing structure is provided on the side of the laser welding head, and shielding gas is blown in from the side of the welding position at a certain angle. Coaxial gas protection is mostly used for plane closed welds, while side-axis gas protection is mostly used for linear welds. It is difficult to achieve a good protection effect when facing complex welding situations by using only one of the two.

[0004] In addition, since different welding materials often need to be replaced during the welding process, and different welding materials require different energies, the focal length of the focusing lens of the laser welding head in the existing structure is fixed and cannot be adjusted according to the switched welding materials. The welding efficiency can only be affected by replacing different laser welding heads.

[0005] In summary, the laser welding head in the prior art has the defects of single blowing mode, fixed focal length and poor applicability. Utility Model Content

[0006] In order to solve the problems existing in the above-mentioned prior art, the utility model aims to provide a laser welding head. The utility model can simultaneously blow shielding gas from coaxial and lateral directions, so as to achieve better shielding effect and cope with complex welding situations. Moreover, the focal length of the focusing lens module of the utility model is adjustable, which can meet the energy requirements of different welding materials, and does not require the replacement of the entire laser welding head, which helps to improve welding efficiency.

[0007] The utility model discloses a laser welding head, comprising an optical fiber connector, a collimation module, a reflection module, a beam splitter module and a focusing lens module connected in sequence along the light path emission direction, an air knife arranged at one end of the focusing lens module away from the beam splitter module, and an imaging element arranged at the other end of the light path of the beam splitter module, the laser welding head also comprises a focusing module, a main axis jet module and a side axis jet module, the focusing lens module is slidably connected with the beam splitter module through the focusing module, so that the focal length of the focusing lens module is adjustable;

[0008] The spindle jet module is connected to the end of the air knife away from the focusing lens module and is coaxially arranged with the focusing lens module. The spindle jet module includes a tapered sleeve and a spindle nozzle. The tapered sleeve includes a connecting section and a tapered section. The connecting section is connected to the air knife. The tapered section is located on a side of the connecting section away from the air knife, and the inner diameter of the tapered section gradually decreases in a direction away from the air knife. The spindle nozzle is connected to the end of the tapered section away from the connecting section. A spindle air inlet is provided on at least one side wall of the tapered sleeve.

[0009] The paraxial jet module includes a connecting piece and a paraxial jet tube, one end of the connecting piece is connected to the paraxial jet tube, and the other end is rotatably connected to the connection between the air knife and the tapered sleeve, one end of the paraxial jet tube is a paraxial air inlet, and the other end is bent and extended toward the direction of the main spindle jet module and has a paraxial jet outlet.

[0010] Preferably, the focusing module includes a shell and a connecting frame, a sliding rod, a screw rod, a first bevel gear, a second bevel gear and a rotating shaft arranged in the shell, the connecting frame is connected to the focusing lens module, a focusing lens body is embedded in the connecting frame, one side of the connecting frame has a sliding rod sleeve adapted to the sliding rod, and the other side has a screw rod sleeve adapted to the screw rod, the sliding rod and the screw rod are respectively arranged on both sides of the connecting frame, and both extend along the axial direction of the focusing lens module, the sliding rod sleeve is slidably sleeved on the sliding rod, the screw rod sleeve is sleeved on the screw rod and cooperates with the screw rod thread, the first bevel gear is connected to the screw rod and rotates synchronously with the screw rod, the second bevel gear is arranged perpendicular to the first bevel gear and meshes with the first bevel gear, one end of the rotating shaft is coaxially arranged and connected to the second bevel gear, and the other end extends outside the shell.

[0011] Preferably, the focusing module includes a shell and a connecting frame, a sliding rod, a gear, a rack and a rotating shaft arranged in the shell, the connecting frame is connected to the focusing lens module, a focusing lens body is embedded in the connecting frame, one side of the connecting frame has a sliding rod sleeve adapted to the sliding rod, and the other side is connected to the rack, the sliding rod and the rack are respectively arranged on both sides of the connecting frame, and both extend along the axial direction of the focusing lens module, the sliding rod sleeve is slidably sleeved on the sliding rod, the gear is arranged beside the rack and meshes with the rack, one end of the rotating shaft is coaxially arranged and connected to the gear, and the other end extends outside the shell.

[0012] Preferably, one end of the rotating shaft exposed outside the shell is connected to a knob.

[0013] Preferably, the spindle nozzle is threadedly connected to the tapered sleeve.

[0014] Preferably, the connection between the air knife and the conical sleeve is cylindrical and has external teeth on the outer circumferential surface. One end of the connecting piece has a connecting hole adapted to the connection. The connecting hole is sleeved on the outside of the connection, and the inner side surface of the connecting hole has internal teeth adapted to the external teeth, and the external teeth are meshed with the internal teeth.

[0015] Preferably, the laser welding head also includes a flow regulating assembly, which includes a flow regulating plate and a rotating rod. The flow regulating plate is movably arranged in the side-axis jet tube, one end of the rotating rod extends into the side-axis jet tube and is connected to the flow regulating plate, and the other end is exposed outside the side-axis jet tube, and the rotating rod is threadedly matched with the side-axis jet tube.

[0016] Preferably, the side-axis jet pipe is made of plastic material.

[0017] The advantages of the laser welding head described in the utility model are:

[0018] 1. The utility model is provided with a main axis jet module and a side axis jet module. During the welding process, the main axis jet module and the side axis jet module can simultaneously blow the protective gas to the welding position. Compared with blowing in a single direction, the protective effect is better and can cope with complex welding situations;

[0019] 2. The utility model makes the focusing mirror module and the beam splitter module slidably connected through the focusing module, so that the relative distance between the focusing mirror module and the beam splitter module is adjustable, that is, the distance between the laser welding head and the welding surface after being fixed is adjustable, thereby realizing the adjustable focal length of the focusing mirror module. In this way, when different welding materials are replaced, the position of the focusing mirror module can be adjusted according to the replaced welding material to focus, which can meet the energy requirements of different welding materials without replacing the entire laser welding head, thereby helping to improve welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a laser welding head described in the utility model;

[0021] Figure 2 is a structural schematic diagram of the focusing module described in Example 1;

[0022] Figure 3 It is a stereoscopic diagram of the main axis air blowing module and the side axis air blowing module of the utility model;

[0023] Figure 4 It is a front view of the main shaft air blowing module and the side shaft air blowing module of the utility model.

[0024] Explanation of the reference numerals: 10 - optical fiber connector, 20 - collimation module, 30 - reflection module, 40 - spectrometer module, 50 - focusing lens module, 60 - air knife, 70 - imaging component, 80 - focusing module, 801 - connecting frame, 8011 - slide rod sleeve, 8012 - lead rod sleeve, 802 - slide rod, 803 - lead rod, 804 - first bevel gear, 805 - second bevel gear, 806 - rotating shaft, 90 - spindle jet module, 901 - tapered sleeve, 902 - spindle nozzle, 100 - side axis jet module, 1001 - connecting piece, 1002 - side axis jet tube, 1003 - flow adjustment component. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 4 As shown, a laser welding head described in the utility model includes a fiber optic connector 10, a collimation module 20, a reflection module 30, a spectroscope module 40 and a focusing lens module 50 which are sequentially connected along the light path. The laser beam propagates and emerges along the above-mentioned light path. The laser welding head also includes an air knife 60 arranged at one end of the focusing lens module 50 away from the spectroscope module 40, and an imaging element 70 arranged at the other end of the light path of the spectroscope module 40. Specifically, the imaging element 70 can be a CCD camera.

[0026] The laser welding head also includes a focusing module 80, a spindle jet module 90 and a paraxial jet module 100. The focusing lens module 50 is slidably connected to the beam splitter module 40 through the focusing module 80, so that the focusing lens module 50 can move closer to or away from the beam splitter module 40, thereby making the distance between the focusing lens and the welding surface adjustable, that is, the focal length adjustable.

[0027] The spindle jet module 90 is connected to the end of the air knife 60 away from the focusing lens module 50 and is coaxially arranged with the focusing lens module 50. Specifically, the spindle jet module 90 includes a tapered sleeve 901 and a spindle nozzle 902. The tapered sleeve 901 includes a connecting section and a tapered section. The connecting section is hollow cylindrical, one end of which is connected to the air knife 60, and the other end is connected to the tapered section. The tapered section is located on the side of the connecting section away from the air knife 60. The inner diameter of the tapered section gradually decreases in the direction away from the air knife 60, forming a tapered sleeve 901 structure. When the airflow flows through the tapered sleeve 901, the flow area gradually decreases and the flow rate gradually increases, forming a concentrated airflow. The spindle nozzle 902 is connected to the end of the tapered sleeve 901 away from the air knife 60. The spindle nozzle 902 is also tapered, which is used to form a concentrated airflow. At least one side wall of the conical sleeve 901 is provided with a spindle air inlet for connecting to an external gas source. Protective gas is introduced into the conical sleeve 901 through the spindle air inlet to form an air flow that is ejected from the spindle nozzle 902 .

[0028] The side-axis jet module 100 includes a connector 1001 and a side-axis jet tube 1002. One end of the connector 1001 is connected to the side-axis jet tube 1002, and the other end is rotatably connected to the connection between the air knife 60 and the tapered sleeve 901, so that the rotation angle of the side-axis jet tube 1002 is adjustable to adjust the direction of the side-axis jet. One end of the side-axis jet tube 1002 is a side-axis air inlet, and the other end is bent and extended toward the direction of the spindle jet module 90 and has a side-axis jet outlet. The side-axis air inlet is connected to an external protective gas source. The protective gas flows into the side-axis jet tube 1002 from the side-axis air inlet, and then is ejected from the side-axis jet outlet at an inclined angle toward the direction of the spindle jet module 90.

[0029] The focusing module 80 is used to adjust the position of the focusing lens module 50. Specifically, it is used to make the focusing lens module 50 slide up and down. The focusing module 80 has at least the following two implementation modes:

[0030] Example 1

[0031] like Figure 2As shown, the focusing module 80 includes a square housing, and a connecting frame 801, a sliding rod 802, a screw rod 803, a first bevel gear 804, a second bevel gear 805 and a rotating shaft 806 arranged in the housing. The connecting frame 801 is in the shape of a round frame, and a focusing lens body is embedded in the hollow middle part for the laser beam to pass through. The connecting frame 801 is connected to the focusing lens module 50 to drive the focusing lens module 50 to slide. A sliding rod sleeve 8011 adapted to the sliding rod 802 is formed on one side of the connecting frame 801, and a screw rod sleeve 8012 adapted to the screw rod 803 is formed on the other side. Specifically, the screw rod sleeve 8012 is tapped with an internal thread adapted to the screw rod 803. The slide bar 802 and the screw rod 803 are respectively arranged on both sides of the connecting frame 801, and both extend along the axial direction of the focusing lens module 50, that is, along the up-down direction. The slide bar sleeve 8011 is slidably sleeved on the slide bar 802, so that the connecting frame 801 and the slide bar 802 form an up-down sliding fit. The screw rod sleeve 8012 is sleeved on the screw rod 803 and forms a threaded fit with the screw rod 803. The first bevel gear 804 is coaxially arranged with the screw rod 803 and connected to the screw rod 803, so that the first bevel gear 804 and the screw rod 803 rotate synchronously. The second bevel gear 805 is arranged perpendicular to the first bevel gear 804 and arranged at the side, and the first bevel gear 804 and the second bevel gear 805 are meshed. One end of the rotating shaft 806 is coaxially arranged and connected with the second bevel gear 805, so that the second bevel gear 805 can be driven to rotate through the rotating shaft 806, and the other end extends outside the housing. In an optional embodiment, the rotating shaft 806 can be rotated manually or driven to rotate by connecting to a motor.

[0032] The focusing module 80 of the present embodiment adopts the cooperation of bevel gears, lead screw 803 and slide bar 802 to form a ball screw pair structure. When the rotating shaft 806 drives the second bevel gear 805 to rotate, the second bevel gear 805 drives the first bevel gear 804 meshing therewith to rotate, thereby causing the lead screw 803 connected to the first bevel gear 804 to rotate. When the lead screw 803 rotates, the guide effect of the slide bar 802 and the slide bar sleeve 8011 causes the connecting frame 801 to slide up and down as a whole, thereby driving the focusing lens module 50 to slide up and down to achieve focusing.

[0033] Example 2

[0034] The focusing module 80 includes a square housing and a connecting frame 801, a sliding rod 802, a gear, a rack and a rotating shaft 806 arranged in the housing. The structures of the connecting frame 801 and the sliding rod 802 are the same as those in Example 1, and can be understood by referring to the description of Example 1, and will not be repeated here. The difference between this embodiment and Example 1 is that a gear rack transmission is used instead of a screw rod 803 transmission. Specifically, the rack is arranged on a side of the connecting frame 801 away from the sliding rod 802 and is connected to the connecting frame 801. The rack extends in the up-down direction. The sliding rod sleeve 8011 is slidably sleeved on the sliding rod 802 to play a role in guiding sliding. The gear is arranged beside the rack and meshed with the rack. One end of the rotating shaft 806 is coaxially arranged and connected with the gear, and the other end extends outside the housing. In an optional embodiment, the rotating shaft 806 can be rotated manually or driven to rotate by connecting to a motor.

[0035] When the rotating shaft 806 drives the gear to rotate, the gear drives the meshing rack to slide up and down, thereby driving the connecting frame 801 to slide up and down, so that the focusing lens module slides up and down to achieve focusing.

[0036] In a preferred embodiment, one end of the rotating shaft 806 exposed outside the housing is connected to a knob, and the knob can facilitate manual rotation of the rotating shaft 806.

[0037] Both of the above two embodiments can adjust the focusing mirror module 50 to slide up and down to achieve focusing. The screw rod 803 of embodiment 1 has high adjustment accuracy, and the gear rack structure of embodiment 2 is simple and easy to implement, and can be selected according to actual needs.

[0038] In a preferred embodiment, the spindle nozzle 902 is threadedly connected to the tapered sleeve 901 , so that the spindle nozzle 902 and the tapered sleeve 901 are detachably connected, which facilitates the removal and replacement of the spindle nozzle 902 .

[0039] In a preferred embodiment, the connection between the air knife 60 and the conical sleeve 901 is cylindrical, and the outer peripheral surface has external teeth. One end of the connecting piece 1001 has a connecting hole adapted to the connection. Specifically, the connecting hole is a circular hole, the connecting hole is sleeved on the outside of the connection, and the inner side of the connecting hole has internal teeth adapted to the external teeth, the external teeth are meshed with the internal teeth, and the structure of the external teeth and the internal teeth is used to increase the relative friction between the connecting piece 1001 and the connection, so that the connecting piece 1001 can remain stationary when not subjected to a large external force, so as to ensure that the position of the side-axis jet tube 1002 is stable during welding and will not move easily. When the connecting piece 1001 is manually rotated, the angle of the connecting piece 1001 can be adjusted, and then the angle of the side-axis jet can be adjusted to adapt to different welding requirements.

[0040] In a preferred embodiment, the laser welding head also includes a flow regulating component 1003, which specifically includes a flow regulating plate and a rotating rod. The flow regulating plate is arranged in the side-axis jet tube 1002, one end of the rotating rod extends into the side-axis jet tube 1002 and is connected to the flow regulating plate, and the other end is exposed outside the side-axis jet tube 1002. The rotating rod is threadedly matched with the side-axis jet tube 1002. Specifically, when the rotating rod rotates, the flow regulating plate is driven to rotate in the side-axis jet tube 1002, thereby adjusting the flow regulating plate in the side-axis jet tube. 1002, for example, when the flow regulating plate is perpendicular to the cross section of the side-axis jet tube 1002, the blocking effect of the flow regulating plate on the side-axis jet tube 1002 is minimal, and the gas flow in the side-axis jet tube 1002 is maximum; when the flow regulating plate is inclined to the cross section of the side-axis jet tube 1002, the blocking effect of the flow regulating plate on the side-axis jet tube 1002 increases, thereby reducing the gas flow in the side-axis jet tube 1002. The angle of the flow regulating plate can be adjusted by rotating the rotary rod, thereby adjusting the gas flow in the side-axis jet tube 1002.

[0041] In a preferred embodiment, the side-axis jet tube 1002 is made of a plastic material, such as hard plastic or plastic metal material, so that the side-axis jet tube 1002 can be shaped when subjected to external force, and the shape and angle can be changed to meet different welding requirements.

[0042] The following will combine the above content to fully explain the working process of this laser welding head:

[0043] When the laser welding head is working, the laser beam is first emitted by the laser, passes through the optical fiber and the optical fiber connector 10 and enters the collimation module 20 to be changed from emitted light to parallel light, and then the parallel light enters the reflector and changes the transmission direction to enter the beam splitter module 40, and the parallel light changes the transmission direction from the beam splitter module 40 to enter the focusing lens body, and finally enters the focusing lens module 50 to form high-energy concentrated light that can be used for welding, so as to weld the welding position.

[0044] During the welding process, the main axis jet module 90 and the side axis jet module 100 simultaneously spray protective gas to the welding position for protection. When the welding material needs to be replaced during the welding process, the position of the focusing lens module 50 can be adjusted by the focusing module 80 to slide it up and down to a suitable position to achieve focusing.

[0045] The utility model is provided with a main axis jet module 90 and a side axis jet module 100, and during the welding process, the main axis jet module 90 and the side axis jet module 100 can simultaneously blow the protective gas to the welding position, and the protective effect is better than that of blowing in a single direction, and can cope with complex welding situations;

[0046] The utility model makes the focusing mirror module 50 and the spectroscope module 40 slidably connected through the focusing module 80, so that the relative distance between the focusing mirror module and the spectroscope module 40 is adjustable, that is, the distance between the laser welding head and the welding surface after being fixed is adjustable, thereby achieving adjustable focal length of the focusing mirror module 50. In this way, when different welding materials are replaced, the position of the focusing mirror module can be adjusted according to the replaced welding materials to focus, which can meet the energy requirements of different welding materials without replacing the entire laser welding head, thereby helping to improve welding efficiency.

[0047] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0048] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A laser welding head, comprising an optical fiber connector, a collimation module, a reflection module, a beam splitter module and a focusing lens module connected in sequence along an optical path, an air knife arranged at one end of the focusing lens module away from the beam splitter module, and an imaging element arranged at the other end of the optical path of the beam splitter module, characterized in that: The laser welding head further comprises a focusing module, a main axis jet module and a paraxial jet module, and the focusing mirror module is slidably connected with the beam splitter module through the focusing module, so that the focal length of the focusing mirror module is adjustable; The spindle jet module is connected to the end of the air knife away from the focusing lens module and is coaxially arranged with the focusing lens module. The spindle jet module includes a tapered sleeve and a spindle nozzle. The tapered sleeve includes a connecting section and a tapered section. The connecting section is connected to the air knife. The tapered section is located on a side of the connecting section away from the air knife, and the inner diameter of the tapered section gradually decreases in a direction away from the air knife. The spindle nozzle is connected to the end of the tapered section away from the connecting section. A spindle air inlet is provided on at least one side wall of the tapered sleeve. The paraxial jet module includes a connecting piece and a paraxial jet tube, one end of the connecting piece is connected to the paraxial jet tube, and the other end is rotatably connected to the connection between the air knife and the tapered sleeve, one end of the paraxial jet tube is a paraxial air inlet, and the other end is bent and extended toward the direction of the main spindle jet module and has a paraxial jet outlet.

2. The laser welding head according to claim 1, characterized in that: The focusing module includes a shell and a connecting frame, a sliding rod, a screw rod, a first bevel gear, a second bevel gear and a rotating shaft arranged in the shell, the connecting frame is connected to the focusing lens module, a focusing lens body is embedded in the connecting frame, one side of the connecting frame has a sliding rod sleeve adapted to the sliding rod, and the other side has a screw rod sleeve adapted to the screw rod, the sliding rod and the screw rod are respectively arranged on both sides of the connecting frame, and both extend along the axial direction of the focusing lens module, the sliding rod sleeve is slidably sleeved on the sliding rod, the screw rod sleeve is sleeved on the screw rod and cooperates with the screw rod thread, the first bevel gear is connected to the screw rod and rotates synchronously with the screw rod, the second bevel gear is arranged perpendicular to the first bevel gear and meshes with the first bevel gear, one end of the rotating shaft is coaxially arranged and connected to the second bevel gear, and the other end extends outside the shell.

3. The laser welding head according to claim 1, characterized in that: The focusing module includes a shell and a connecting frame, a sliding rod, a gear, a rack and a rotating shaft arranged in the shell. The connecting frame is connected to the focusing lens module, and a focusing lens body is embedded in the connecting frame. One side of the connecting frame has a sliding rod sleeve adapted to the sliding rod, and the other side is connected to the rack. The sliding rod and the rack are respectively arranged on both sides of the connecting frame, and both extend along the axial direction of the focusing lens module. The sliding rod sleeve is slidably sleeved on the sliding rod, the gear is arranged beside the rack and meshes with the rack, one end of the rotating shaft is coaxially arranged and connected to the gear, and the other end extends outside the shell.

4. The laser welding head according to claim 2 or 3, characterized in that: One end of the rotating shaft exposed outside the shell is connected with a knob.

5. The laser welding head according to claim 1, characterized in that: The spindle nozzle is threadedly connected to the tapered sleeve.

6. The laser welding head according to claim 1, characterized in that: The connection between the air knife and the conical sleeve is cylindrical, and the outer circumferential surface has external teeth. One end of the connecting piece has a connecting hole adapted to the connection. The connecting hole is sleeved on the outside of the connection, and the inner side surface of the connecting hole has internal teeth adapted to the external teeth, and the external teeth are meshed with the internal teeth.

7. The laser welding head according to claim 1 or 6, characterized in that: It also includes a flow regulating component, which includes a flow regulating plate and a rotating rod. The flow regulating plate is movably arranged in the side-axis jet tube. One end of the rotating rod extends into the side-axis jet tube and is connected to the flow regulating plate, and the other end is exposed outside the side-axis jet tube. The rotating rod is threadedly matched with the side-axis jet tube.

8. The laser welding head according to claim 7, characterized in that: The side axis jet pipe is made of plastic material.

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