A laser-hollow tungsten arc coaxial composite welding torch

Abstract

The invention discloses a laser-hollow tungsten pole arc coaxial composite welding torch, which relates to the technical field of welding and comprises a hollow tungsten pole, a plurality of chambers and a plurality of laser beams. The welding energy of the laser-hollow tungsten pole coaxial composite welding torch can be greatly improved by focusing a first laser beam arranged in the hollow tungsten pole, an arc of the hollow tungsten pole and a second laser beam located at the periphery of the hollow tungsten pole and placed in a second chamber; impurities such as an oxide layer, dust and attachments of a plate to be welded can be cleaned by arranging a third laser beam at the periphery; the welding wire is spirally arranged in a sixth chamber, so that the integration of the composite welding torch is improved and the welding quality is better guaranteed; and the fourth chamber is arranged so that impurities generated by the cleaning of the third laser beam can be sucked away under the action of a hollow fan, and plasma plume generated by the plume effect in the welding zone can also be sucked away, so as to avoid laser energy loss and effectively ensure welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a laser-hollow tungsten arc coaxial composite welding torch. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding has the advantages of high heat source energy density and strong penetration ability, but the energy utilization rate of single laser welding of continuous laser is extremely low. Arc welding is the most widely used welding method in industrial production. The metal to be welded is used as one pole and the electrode is used as the other pole. When the two poles are close, an arc is generated. The heat generated by the arc discharge (commonly known as arc combustion) is used to melt the electrode and the workpiece together and form a weld after condensation, thereby obtaining a strong joint welding process.

[0003] In the welding of large parts of aviation equipment such as large aircraft, the laser-arc coaxial composite welding torch has better spatial accessibility than the side-load welding torch due to the good symmetry of the welding heat source. For example, the patent with application number CN201711493102.1 proposes a new form of laser TIG composite welding head, which integrates the traditional laser TIG composite welding heads of the laser welding head and the TIG welding head into one welding head. After the laser welding head and the TIG welding head are integrated, the laser TIG tungsten electrode emits light inside or the laser surrounds the tungsten electrode and focuses on the front end of the tungsten electrode. A new welding method reduces the size of the welding head and is more flexible to use. However, this method of only focusing the laser inside the tungsten electrode has limited power improvement on the welding torch, and there is a double critical effect in the laser-hollow tungsten electrode arc coaxial composite welding. When the laser power or welding current exceeds the upper critical value, the volume of the welding plume expands sharply, the laser energy transmission is blocked, the heat source becomes unstable, the weld shape quality decreases, and even the welding cannot be completed. Summary of the invention

[0004] The purpose of the present invention is to disclose a laser-hollow tungsten arc coaxial composite welding torch to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a laser-hollow tungsten arc coaxial composite welding torch, comprising a hollow tungsten pole, a tungsten pole clamp, and a first chamber formed in the axial region of the hollow tungsten pole, wherein the hollow tungsten pole is clamped and fixed by the tungsten pole clamp, and characterized in that it also comprises a second chamber, a third chamber, a fourth chamber, and a fifth chamber arranged outward in sequence with the axis of the first chamber as the center;

[0006] A first laser beam emitted from a central area of ​​the laser emitting device passes through a first chamber and irradiates a central welding area of ​​the plate to be welded;

[0007] A tungsten electrode clamp is installed at the upper part of the second chamber, and a first hollow refractive lens is installed at the lower part. The tungsten electrode clamp is provided with a through hole at the central axis position in the second chamber. The second laser beam emitted by the laser emitting device sequentially passes through the through hole of the tungsten electrode clamp in the second chamber and the first hollow refractive lens to irradiate the welding area of ​​the plate to be welded;

[0008] The welding shielding gas acts downward on the welding area through the third chamber, and the shielding gas containing welding impurities flows back upward through the fourth chamber;

[0009] A second hollow refractive lens is arranged at the lower part of the fifth chamber, and a third laser beam emitted by a laser emitting device or a ring laser diode built into the fifth chamber passes through the second hollow refractive lens in the fifth chamber and irradiates the periphery of the welding area of ​​the plate to be welded.

[0010] Optionally, the first laser beam, the second laser beam and the arc formed by the output end of the hollow tungsten electrode act together on the welding area of ​​the plate to be welded to perform welding operations; the third laser beam is used to clean the outer surface of the welding area of ​​the plate to be welded.

[0011] Optionally, a hollow shaft motor is provided on the top of the hollow tungsten pole, and the output shaft of the hollow shaft motor is connected to a hollow fan. The first laser beam and the second laser beam enter the first chamber and the second chamber respectively through the hollow areas of the hollow fan and the hollow shaft motor, and the blades of the hollow fan are located at the uppermost end of the fourth chamber.

[0012] Optionally, it also includes a wire feeding port arranged outside the welding torch and a sixth chamber arranged between the fourth chamber and the fifth chamber. The welding wire is spirally fed through the wire feeding port through the sixth chamber downward to above the welding area of ​​the plate to be welded.

[0013] Optionally, it also includes an electrical interface and an air inlet arranged on the outside of the welding torch, the electrical interface is used to supply power to the hollow tungsten pole and the ring laser diode, and the air inlet is used to introduce welding shielding gas.

[0014] Optionally, the output energy of the third laser beam is lower than the output energy of the first laser beam and the second laser beam.

[0015] Optionally, the ring laser diode is composed of a plurality of laser diode ring arrays.

[0016] Optionally, the third laser beam is in the shape of a circle, an annular ring, an arc line, or a curved surface.

[0017] Optionally, the first hollow refractive lens plays a focusing role, and the second laser beam is focused above the welding area of ​​the plate to be welded after passing through the first hollow refractive lens.

[0018] Optionally, the laser is a pulsed laser and the arc is a TIG arc.

[0019] Technical effects and advantages of the present invention:

[0020] 1. The present invention utilizes the focusing effect of the first laser beam located in the hollow of the hollow tungsten electrode, the arc of the hollow tungsten electrode, and the second laser beam located outside the hollow tungsten electrode and placed in the second chamber, which can greatly improve the welding energy of the laser-hollow tungsten electrode coaxial composite welding torch, and can ensure that the size of the composite welding torch is small and improve the high-power welding performance of the welding torch as much as possible.

[0021] 2. The present invention is provided with a second hollow refractive lens at the lower part of the fifth chamber. The third laser beam emitted by the laser emitting device or the ring laser diode built into the fifth chamber passes through the second hollow refractive lens in the fifth chamber and irradiates the periphery of the welding area of ​​the plate to be welded. The third laser beam can clean the oxide layer, dust, attachments and other impurities of the plate to be welded before welding, thereby reducing the generation of impurities and the probability of the feather effect during the welding process.

[0022] 3. The present invention arranges a hollow shaft motor on the upper part of the hollow tungsten pole, and the output shaft of the hollow shaft motor is connected to a hollow fan. The blades of the hollow fan are located at the uppermost end of the fourth chamber. The third chamber is protected by welding gas. Under the action of the hollow fan, the fourth chamber can remove the oxide layer, dust, attachments and other impurities of the plate to be welded by the third laser beam, and can also remove the plasma plume generated by the plume effect in the welding area, thereby avoiding laser energy loss and effectively ensuring welding quality.

[0023] 4. The present invention arranges the welding wire in a spiral shape in the sixth chamber, which facilitates the arrangement of various interfaces on the outer surface of the composite welding torch and improves the integration of the composite welding torch. At the same time, since the welding wire is close to the hollow tungsten electrode, the hollow tungsten electrode can preheat the welding wire in advance during welding, which is more conducive to the welding wire being heated and melted when it reaches the welding area. In addition, it is also further convenient to realize the automation of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a laser-hollow tungsten arc coaxial composite welding torch structure according to a first embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the laser-hollow tungsten arc coaxial composite welding torch structure according to the second embodiment of the present invention.

[0026] In the figure: 1. laser emitting device; 2. hollow fan; 3. hollow shaft motor; 4. hollow tungsten pole; 5. tungsten pole clamp; 6. first hollow refractive lens; 7. second hollow refractive lens; 8. electric arc; 9. plate to be welded; 10. first laser beam; 11. second laser beam; 12. first chamber; 13. second chamber; 14. third chamber; 15. fourth chamber; 16. fifth chamber; 17. sixth chamber; 18. welding wire; 19. ring laser diode; 20. third laser beam; 21. electrical interface; 22. air inlet; 23. wire feed port. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from the description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0029] Embodiment 1

[0030] See also Figure 1 , discloses a laser-hollow tungsten arc coaxial composite welding torch, comprising a hollow tungsten electrode 4, a tungsten electrode clamp 5, a first chamber 12 formed in the axial region of the hollow tungsten electrode 4, the hollow tungsten electrode 4 is clamped and fixed by the tungsten electrode clamp 5, and also comprising a second chamber 13, a third chamber 14, a fourth chamber 15, and a fifth chamber 16 arranged outwardly from the axis of the first chamber 12. Among them, the first laser beam 10 emitted from the central region of the laser emitting device 1 passes through the first chamber 12 to irradiate the central welding area of ​​the plate 9 to be welded, the tungsten electrode clamp 5 is installed in the upper part of the second chamber 13, and the first hollow refractive lens 6 is installed in the lower part, the tungsten electrode clamp 5 is provided with a through hole at the central axis position in the second chamber 13, and the second laser beam 11 emitted by the laser emitting device 1 passes through the through hole of the tungsten electrode clamp 5 in the second chamber 13 and the first hollow refractive lens 6 in sequence to irradiate the welding area of ​​the plate 9 to be welded. The welding shielding gas acts downward on the welding area through the third chamber 14, and the shielding gas containing welding impurities flows back upward through the fourth chamber 15. A second hollow refractive lens 7 is arranged at the lower part of the fifth chamber 16, and the third laser beam 20 emitted by the laser emitting device 1 passes through the second hollow refractive lens 7 in the fifth chamber 16 and irradiates the periphery of the welding area of ​​the plate 9 to be welded.

[0031] Furthermore, the first laser beam 10, the second laser beam 11 and the arc formed at the output end of the hollow tungsten electrode 4 act together on the welding area of ​​the plate 9 to be welded to perform welding operations; the third laser beam (20) is used to clean the outer surface of the welding area of ​​the plate 9 to be welded.

[0032] In this way, by utilizing the focusing effect of the first laser beam 10 located in the hollow tungsten electrode, the arc of the hollow tungsten electrode 4 and the second laser beam 11 located outside the hollow tungsten electrode 4 and placed in the second chamber 13, the welding energy of the laser-hollow tungsten electrode coaxial composite welding torch can be greatly improved, and the high-power welding performance of the welding torch can be improved as much as possible while ensuring the small size of the composite welding torch. In the process of moving the welding torch, the outermost third laser beam 20 passes through the second hollow refractive lens 7 in the fifth chamber 16 and irradiates the periphery of the welding area of ​​the plate 9 to be welded, which can clean the oxide layer, dust, attachments and other impurities of the plate 9 to be welded before welding, thereby reducing the generation of impurities and the probability of the feather effect during the welding process.

[0033] Furthermore, a hollow shaft motor 3 is provided on the upper part of the hollow tungsten pole 4, and the output shaft of the hollow shaft motor 3 is connected to the hollow fan 2. The first laser beam 10 and the second laser beam 11 enter the first chamber 12 and the second chamber 13 respectively through the hollow areas of the hollow fan 2 and the hollow shaft motor 3, and the blades of the hollow fan 2 are located at the uppermost end of the fourth chamber 15.

[0034] When in use, the third chamber 14 is filled with welding shielding gas, which flows downward and is distributed around the welding area, protecting the composite welding process. When the welding power is increased and a welding plume effect appears, or when the third laser beam 20 is used to pass through the second hollow refractive lens 7 in the fifth chamber 16 and irradiate the oxide layer, dust, attachments and other impurities raised on the periphery of the welding area of ​​the plate to be welded 9, the hollow shaft motor 3 is started, and the hollow shaft motor drives the hollow fan 2 to rotate and draw air upward, and the oxide layer, dust, attachments and other impurities raised on the periphery of the welding area near the bottom of the fourth chamber 15 and the plasma plume particles in the welding area enter the fourth chamber 15 and are drawn out through the blades of the hollow fan 2. In this way, the cleanliness of the welding area is guaranteed, the loss of laser energy is avoided, and the welding quality is effectively guaranteed.

[0035] Furthermore, the output energy of the third laser beam 20 is lower than the output energy of the first laser beam 10 and the second laser beam 11. Because the third laser beam 20 is only used to clean the oxide layer, dust, attachments and other impurities in the welding area in advance, the required power is relatively small. The smaller power can prevent the third laser beam 20 from seriously ablating the plate 9 to be welded, thereby affecting the structural strength. The first laser beam 10 and the second laser beam 11 are important energy sources for connecting the plates 9 to be welded, and the required welding power is relatively large. It should be noted that the first laser beam 10 is an essential component of the composite welding and is always working during welding. The second laser beam 11 is used as a supplement. When the power of the composite welding torch is insufficient, the second laser beam 11 starts to work.

[0036] Further, the third laser beam 20 is circular or annular or arc-shaped or cambered. When the third laser beam 20 works in a circular shape, the surrounding of the area to be welded can be roughly cleaned in advance, and the oxide layer, welding slag and other impurities after welding can be roughly cleaned; when the third laser beam 20 works in a circular shape, the area to be welded can be carefully cleaned in advance and the oxide layer, welding slag and other impurities after welding can be deeply cleaned; when the third laser beam 20 is in an arc shape, only the area to be welded can be roughly cleaned in advance, and when the third laser beam 20 is in two arc shapes symmetrical with respect to the arc center point, only the area to be welded can be roughly cleaned in advance while the oxide layer, welding slag and other impurities after welding can be roughly cleaned; when the third laser beam 20 is in an arc shape, only the area to be welded can be cleaned in advance more carefully, and when the third laser beam 20 is in two arc shapes symmetrical with respect to the arc center point, only the area to be welded can be cleaned in advance more carefully while the oxide layer, welding slag and other impurities after welding can be deeply cleaned.

[0037] It should be noted that when the third laser beam 20 is circular or annular, the composite welding torch provided in this embodiment is suitable for manual operation. Since the welding direction of the personnel is non-directional, the composite welding torch with the third laser beam 20 in a circular or annular shape can clean the area to be welded in advance and can clean the oxide layer, welding slag and other impurities after welding when used in different directions. When the third laser beam 20 is in an arc shape or an arc surface shape, the composite welding torch provided in this embodiment is suitable for automated operation. Since the welding direction is directional as determined by the program, while saving welding power, the composite welding torch with the third laser beam 20 in an arc shape or an arc surface shape can clean the area to be welded in advance and can clean the oxide layer, welding slag and other impurities after welding when used in a directional manner.

[0038] It should be further explained that when the third laser beam 20 is in an arc shape or an arc surface shape, the connection length between the endpoints of the arc shape or the arc surface shape is greater than the maximum width of the arc 8, so that the cleaning area of ​​the third laser beam 20 can be effectively covered by the welding area.

[0039] Furthermore, the first hollow refractive lens 6 plays a focusing role, and the second laser beam 11 is focused above the welding area of ​​the to-be-welded plate 9 after passing through the first hollow refractive lens 6. The refraction of the second hollow refractive lens 7 toward the center of the circle is circular or arc-shaped or arc-shaped or arc-shaped, so that it can match the conical welding head of the composite welding torch, which is more conducive to the spatial accessibility of the composite welding torch.

[0040] Furthermore, the laser mentioned above is a pulsed laser, and the arc mentioned above is a TIG arc.

[0041] When the third laser beam 20 is circular or annular, it occupies the space close to the outer surface of the composite welding torch, which is not conducive to setting various interfaces (such as electrical interfaces, air inlets, etc.) on the outer surface, and when the welding wire is fed externally, the third laser beam 20 easily ablates the coating on the outer surface of the welding wire 18, affecting the welding effect. Therefore, further improvements are needed. Please refer to the following embodiments for details.

[0042] Embodiment 2

[0043] See also Figure 2 , discloses a laser-hollow tungsten arc coaxial composite welding torch, which includes a hollow tungsten electrode 4, a tungsten electrode clamp 5, a first chamber 12 formed in the axial area of ​​the hollow tungsten electrode 4, and the hollow tungsten electrode 4 is clamped and fixed by the tungsten electrode clamp 5. It is characterized in that it also includes a second chamber 13, a third chamber 14, a fourth chamber 15, and a fifth chamber 16 arranged in sequence outward with the axis of the first chamber 12 as the center; wherein the first laser beam 10 emitted from the central area of ​​the laser emitting device 1 passes through the first chamber 12 and irradiates the central welding area of ​​the plate 9 to be welded; the upper part of the second chamber 13 is equipped with a tungsten electrode clamp 5, and the lower part is equipped with a first hollow refractive lens 6, and the tungsten electrode The clamp 5 is provided with a through hole at the central axis position in the second chamber 13, and the second laser beam 11 emitted by the laser emitting device 1 passes through the through hole of the tungsten electrode clamp 5 in the second chamber 13 and the first hollow refractive lens 6 in sequence to irradiate the welding area of ​​the plate 9 to be welded; the welding shielding gas acts downward on the welding area through the third chamber 14, and the shielding gas containing welding impurities flows back upward through the fourth chamber 15; the second hollow refractive lens 7 is provided at the lower part of the fifth chamber 16, and the third laser beam 20 emitted by the ring laser diode 19 built into the fifth chamber 16 passes through the second hollow refractive lens 7 in the fifth chamber 16 to irradiate the periphery of the welding area of ​​the plate 9 to be welded.

[0044] This makes it easier to set various interfaces on the outer surface of the composite welding torch and improves the integration of the composite welding torch.

[0045] The laser-hollow tungsten arc coaxial composite welding torch provided in this embodiment, the setting mode and working principle of the hollow shaft motor 3 and the hollow fan 2, the energy relationship among the first laser beam 10, the second laser beam 11 and the third laser beam 20, the refractive form of the first hollow refractive lens 6 and the second hollow refractive lens 7, and the beam structure form of the third laser beam 20 can all be referred to in Example 1, and will not be elaborated in detail in this embodiment.

[0046] In this embodiment, further, it also includes a wire feed port 23 arranged outside the welding torch and a sixth chamber 17 arranged between the fourth chamber 15 and the fifth chamber 16. The welding wire 18 passes through the sixth chamber 17 in a spiral shape through the wire feed port 23 and is sent downward to the top of the welding area of ​​the plate 9 to be welded. It should be noted that there is a groove matching the welding wire 18 in the sixth chamber 17, and the welding wire 18 is limited by the matching groove, and the welding wire 18 is spirally fed downward in the groove, and the welding wire 18 is sent out from the lower end of the sixth chamber 17. A guide mechanism is provided, and the guide mechanism is used to guide the welding wire 18 to the top of the welding area of ​​the plate 9 to be welded, so as to facilitate the automation of the welding process.

[0047] By spirally arranging the welding wire 18 in the sixth chamber 17, it is convenient to arrange various interfaces on the outer surface of the composite welding torch and improve the integration of the composite welding torch. Since the welding wire 18 is close to the hollow tungsten electrode 4, during welding, the hollow tungsten electrode 4 can preheat the welding wire 18 in advance, which is more conducive to the welding wire 18 being heated and melted when it reaches the welding area.

[0048] Furthermore, the laser-hollow tungsten arc coaxial composite welding torch provided in this embodiment also includes an electrical interface 21 and an air inlet 22 arranged on the outside of the welding torch, the electrical interface 21 is used to supply power to the hollow tungsten electrode 4 and the ring laser diode 19, and the air inlet 22 is used to introduce welding shielding gas.

[0049] Furthermore, the annular laser diode 19 is composed of a plurality of laser diode annular arrays. The third laser beam 20 emitted by the plurality of laser diodes may be circular or annular, and may be controlled to realize an arc shape or an arc surface shape in a specific orientation according to actual welding requirements and control program.

[0050] The first and second embodiments provide a laser-hollow tungsten arc coaxial composite welding torch, which can greatly improve the welding energy of the laser-hollow tungsten coaxial composite welding torch by utilizing the focusing effect of the first laser beam located in the hollow of the hollow tungsten pole, the arc of the hollow tungsten pole, and the second laser beam located at the periphery of the hollow tungsten pole and placed in the second chamber, and can improve the high-power welding performance of the welding torch as much as possible under the premise of ensuring the small size of the composite welding torch; the third laser beam emitted by the laser emitting device or the ring laser diode built in the fifth chamber passes through the second hollow refractive lens in the fifth chamber to irradiate the periphery of the welding area of ​​the plate to be welded, and can clean the oxide layer, dust, attachments and other impurities of the plate to be welded by the third laser beam before welding, thereby reducing the probability of impurity shells and feather effects in the welding process; by arranging a hollow shaft motor on the upper part of the hollow tungsten pole and the blades of the hollow fan being located at the uppermost end of the fourth chamber, the oxide layer, dust, attachments and other impurities of the plate to be welded cleaned by the third laser beam can be removed, and the plasma feather generated by the feather effect in the welding area can also be removed, thereby avoiding laser energy loss and effectively ensuring welding quality.

[0051] The second embodiment provides a laser-hollow tungsten arc coaxial composite welding torch, which is arranged in a spiral shape in the sixth chamber, so that various interfaces are arranged on the outer surface of the composite welding torch and the integration of the composite welding torch is improved. Since the welding wire is close to the hollow tungsten electrode, the hollow tungsten electrode can preheat the welding wire in advance during welding, which is more conducive to the melting of the welding wire when it reaches the welding area. In addition, it is also further convenient to realize the automation of the welding process.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A laser-hollow tungsten arc coaxial composite welding torch, comprising a hollow tungsten electrode (4), a tungsten electrode clamp (5), and a first chamber (12) formed in the axial region of the hollow tungsten electrode (4), wherein the hollow tungsten electrode (4) is clamped and fixed by the tungsten electrode clamp (5), characterized in that: It also includes a second chamber (13), a third chamber (14), a fourth chamber (15), and a fifth chamber (16) which are arranged outward in sequence with the axis of the first chamber (12) as the center; A first laser beam (10) emitted from a central area of ​​the laser emitting device (1) passes through a first chamber (12) and irradiates a central welding area of ​​a plate (9) to be welded; A tungsten electrode clamp (5) is installed at the upper part of the second chamber (13), and a first hollow refractive lens (6) is installed at the lower part; the tungsten electrode clamp (5) is provided with a through hole at the central axis position in the second chamber (13); the second laser beam (11) emitted by the laser emitting device (1) sequentially passes through the through hole of the tungsten electrode clamp (5) in the second chamber (13) and the first hollow refractive lens (6) to irradiate the welding area of ​​the plate (9) to be welded; The welding shielding gas acts downward on the welding area through the third chamber (14), and the shielding gas containing welding impurities flows back upward through the fourth chamber (15); A second hollow refractive lens (7) is disposed at the lower portion of the fifth chamber (16); a third laser beam (20) emitted by a laser emitting device (1) or a ring laser diode (19) built into the fifth chamber (16) passes through the second hollow refractive lens (7) in the fifth chamber (16) and irradiates the periphery of the welding area of ​​the plate (9) to be welded; A hollow shaft motor (3) is arranged on the upper part of the hollow tungsten pole (4); the output shaft of the hollow shaft motor (3) is connected to a hollow fan (2); the first laser beam (10) and the second laser beam (11) respectively enter the first chamber (12) and the second chamber (13) through the hollow areas of the hollow fan (2) and the hollow shaft motor (3); and the blades of the hollow fan (2) are located at the uppermost end of the fourth chamber (15).

2. The laser-hollow tungsten arc coaxial composite welding torch according to claim 1, characterized in that: The first laser beam (10), the second laser beam (11) and the arc (8) formed at the output end of the hollow tungsten electrode (4) act together on the welding area of ​​the plate to be welded (9) to perform welding operations; the third laser beam (20) is used to clean the peripheral surface of the welding area of ​​the plate to be welded (9).

3. The laser-hollow tungsten arc coaxial composite welding torch according to claim 1, characterized in that: It also includes a wire feeding port (23) arranged outside the welding torch and a sixth chamber (17) arranged between the fourth chamber (15) and the fifth chamber (16); the welding wire (18) is spirally fed through the wire feeding port (23) through the sixth chamber (17) and fed downward to the top of the welding area of ​​the plate (9) to be welded.

4. The laser-hollow tungsten arc coaxial composite welding torch according to claim 3, characterized in that: It also includes an electrical interface (21) and an air inlet (22) arranged outside the welding torch, wherein the electrical interface (21) is used to supply power to the hollow tungsten pole (4) and the ring laser diode (19), and the air inlet (22) is used to introduce welding shielding gas.

5. The laser-hollow tungsten arc coaxial composite welding torch according to claim 4, characterized in that: The output energy of the third laser beam (20) is lower than the output energy of the first laser beam (10) and the second laser beam (11).

6. The laser-hollow tungsten arc coaxial composite welding torch according to claim 5, characterized in that: The ring laser diode (19) is composed of a plurality of laser diode ring arrays.

7. The laser-hollow tungsten arc coaxial composite welding torch according to claim 6, characterized in that: The third laser beam (20) is in the shape of a circle, a ring, an arc, or a curved surface.

8. The laser-hollow tungsten arc coaxial composite welding torch according to claim 7, characterized in that: The first hollow refractive lens (6) plays a focusing role, and the second laser beam (11) is focused above the welding area of ​​the plate (9) to be welded after passing through the first hollow refractive lens (6).

9. The laser-hollow tungsten arc coaxial composite welding torch according to claim 8, characterized in that: The laser is a pulse laser, and the arc is a TIG arc.

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