CN110666355A

CN110666355A - Welding gun head, laser arc composite welding device and method

Info

Publication number: CN110666355A
Application number: CN201910990222.5A
Authority: CN
Inventors: 雷正; 朱宗涛; 陈辉; 黄举近; 刘瑞琳
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-01-10

Abstract

The embodiment of the application provides a welding gun head, a laser-arc hybrid welding device and a laser-arc hybrid welding method, and relates to the technical field of welding. The welding gun head comprises a welding gun body, a conductive nozzle and a tungsten electrode assembly. The welding gun body is provided with a nozzle opening, the conductive nozzle is arranged in the welding gun body, and the tungsten electrode assembly is connected with the conductive nozzle and provided with a through hole. The laser-arc hybrid welding device comprises a pulse laser, a TIG arc welder and a welding gun head. The pulse laser comprises a laser lens and is used for providing pulse laser, and the TIG electric arc welding machine is electrically connected with the contact tip and is used for providing a power supply. Pulse laser generated by the pulse laser can penetrate through the through hole to be emitted from the nozzle opening, the tungsten electrode assembly generates electric arcs under the action of the TIG electric arc welding machine, and the pulse laser is located in the center of the electric arcs. According to the composite welding method, the pulse laser and the electric arc are compounded, and the pulse laser beam penetrates through the center of the electric arc, so that the energy consumption is reduced, the accessibility is increased, the energy utilization rate is enhanced, and the welding efficiency is improved.

Description

Welding gun head, laser arc composite welding device and method

Technical Field

The application relates to the technical field of welding, in particular to a welding gun head, a laser-arc hybrid welding device and a laser-arc hybrid welding method.

Background

With the increasing shortage of global resources, the reduction of energy consumption and cost saving become more and more important for industrial production.

The laser welding has the advantages of high heat source energy density and strong penetration capacity, but the energy utilization rate of the single laser welding of continuous laser is extremely low; the electric arc welding has the advantages of simple process equipment and mature technology, but the welding efficiency is not high.

Disclosure of Invention

Objects of the present application include, for example, providing a welding torch head, a laser arc hybrid welding apparatus and method, which can combine pulse laser welding and TIG arc welding, enhance energy utilization efficiency, increase accessibility, and improve welding efficiency.

The embodiment of the application can be realized as follows:

in a first aspect, an embodiment of the present application provides a welding gun head, including a welding gun body, a contact tip, and a tungsten electrode assembly;

the welding gun body is used for being connected with a laser lens of a pulse laser and provided with a nozzle opening, the contact tube is arranged in the welding gun body and used for being electrically connected with a TIG (tungsten inert gas) arc welding machine, and the tungsten electrode assembly is connected with the contact tube and provided with a through hole;

the pulse laser that the pulse laser produced can pass through the through-going hole after the laser lens is sent out and can be followed the nozzle mouth and jettisoned, simultaneously, TIG electric arc welding machine provides the power and can pass through the contact tip can transmit to tungsten utmost point subassembly to make tungsten utmost point subassembly produce the electric arc and from the nozzle mouth releases.

In an optional embodiment, the tungsten electrode assembly includes a tungsten electrode body and a clamping member, the tungsten electrode body includes a first tungsten electrode and a second tungsten electrode which are fixedly connected, the second tungsten electrode is close to the nozzle opening relative to the first tungsten electrode, the clamping member is clamped in the first tungsten electrode and connected to the inner cavity of the contact nozzle, the cross-sectional diameter of one end, far away from the first tungsten electrode, of the second tungsten electrode is gradually reduced along the cross-sectional diameter of the laser emission direction, and the through hole is formed along the axial direction of the tungsten electrode body.

In a second aspect, an embodiment of the present application provides a laser-arc hybrid welding apparatus, including a pulse laser, a TIG arc welder, and a torch head according to any one of the foregoing embodiments;

the pulse laser comprises a laser lens, the laser lens is fixedly arranged at one end, deviating from the nozzle opening, of the welding gun head and is used for providing pulse laser, the TIG electric arc welding machine is electrically connected with the conductive nozzle and is used for providing a power supply, the pulse laser emitted by the pulse laser penetrates through the penetrating hole of the tungsten electrode assembly through the laser lens and is ejected out of the nozzle opening, and meanwhile, the TIG electric arc welding machine is electrically connected with the tungsten electrode assembly through the conductive nozzle so that the tungsten electrode assembly generates electric arcs and is ejected out of the nozzle opening.

In an optional embodiment, the tungsten electrode assembly includes a tungsten electrode body, the through hole is opened along an axial direction of the tungsten electrode body and is a circular hole, the tungsten electrode body can generate an electric arc under the action of the TIG electric arc welder, and the pulse laser generated by the pulse laser can be emitted from a central position of the through hole so that the pulse laser is positioned at the central position of the electric arc.

In a third aspect, an embodiment of the present application provides a laser arc hybrid welding method, including a welding step:

laser welding and arc welding are simultaneously carried out on one part of the part to be welded, and the laser beam penetrates through the center of the arc.

In an alternative embodiment, the laser is a pulsed laser.

In an alternative embodiment, the arc is a TIG arc.

In an alternative embodiment, a parameter setting step is included before the welding step:

the single pulse energy, the pulse width and the pulse frequency of the pulse laser are set, and the current parameter, the voltage parameter, the welding gun angle, the tungsten electrode inner diameter, the welding speed and the protective gas flow of the TIG electric arc welding machine are set.

In an optional embodiment, before the parameter setting step, a preparation step is further included:

and cleaning, assembling and positioning the part to be welded before welding.

In an alternative embodiment, a path setting step is further included between the welding step and the parameter setting step:

and editing the walking path of the robot hand to determine the starting point and the end point of the composite welding.

The beneficial effects of the embodiment of the application include, for example:

because the tungsten electrode assembly is provided with the through hole for injecting the pulse laser, the conductive nozzle is electrically connected with the TIG electric arc welding machine, so that a power supply provided by the TIG electric arc welding machine is transmitted to the tungsten electrode assembly through the conductive nozzle. The tungsten electrode assembly can generate electric arcs under the action of a TIG electric arc welding machine, and pulse laser generated by the pulse laser can be emitted from a through hole of the tungsten electrode assembly, so that the pulse laser is positioned at the central position of the electric arcs, and coaxial hybrid welding of the pulse laser and the TIG electric arcs is realized. The pulse laser has lower average power than continuous laser and high photoelectric conversion efficiency, so the energy consumption is low and the energy utilization rate is high; the accessibility of the welding gun head is good, and the welding efficiency is high; the heat input of the total welding is small, the electric arc is stable, and the welding quality is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic view of a laser-arc hybrid welding apparatus provided in an embodiment of the present application;

fig. 2 is a schematic view of a torch head in a laser-arc hybrid welding device provided in an embodiment of the present application.

Icon: 100-laser arc hybrid welding device; 01-a part to be welded; 10-welding gun head; 11-a nozzle opening; 12-a torch body; 121-a wire feeding pipe; 122-shielding gas outlet; 123-protective gas hood; 13-a contact tip; 14-a clamp; 15-tungsten electrode body; 152-a first tungsten electrode; 153-a second tungsten electrode; 155-through holes; 20-a pulsed laser; 21-a laser body; 22-laser lens; 23-a pulsed laser beam; 30-TIG arc welder; 40-protective gas cylinder; 45-protection of the trachea; 50-a wire feeder; 60-a robot hand.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. are used to indicate an orientation or positional relationship based on that shown in the drawings or that the application product is usually placed in use, the description is merely for convenience and simplicity, and it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present application.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.

Examples

The embodiment of the application provides a laser-arc hybrid welding device 100, and the laser-arc hybrid welding device 100 is used for hybrid welding of a workpiece to be welded 01, so that welding efficiency and welding quality are improved. The laser-arc hybrid welding device 100 comprises a welding torch head 10, wherein the welding torch head 10 is used for combining pulse laser and TIG electric arc, so that the pulse laser and the TIG electric arc are simultaneously emitted from a nozzle opening 11 of the welding torch head 10, and the pulse laser beam is positioned in the center of the TIG electric arc.

The existing laser welding has the characteristics of high heat source energy density and strong penetration capability. However, there are also materials with low laser absorption rate, especially nonferrous metals such as aluminum alloy, which results in extremely low energy utilization rate of laser welding; the process equipment of the electric arc welding is simple, and the technology is mature. However, the welding efficiency of the arc welding is not high due to large welding heat input and large welding deformation. The method combines two welding modes of pulse laser welding and TIG electric arc welding, thereby fully playing respective advantages of the two modes and being a welding method with great development prospect.

The specific structure and the corresponding relationship between the components of the laser arc hybrid welding apparatus 100 according to the present embodiment will be described in detail below.

Fig. 1 is a schematic view of a laser arc hybrid welding apparatus 100 provided in the present application, and fig. 2 is a schematic view of a torch head 10 in the laser arc hybrid welding apparatus 100 provided in the present application.

Referring to fig. 1 and 2, a laser-arc hybrid welding apparatus 100 includes a pulse laser 20, a TIG arc welder 30, and a torch head 10.

The pulse laser 20 includes a laser body 21 and a laser lens 22, the laser lens 22 is electrically connected to the laser body 21, and the laser lens 22 is fixedly disposed at the tail of the welding gun head 10 and is used for providing pulse laser.

TIG arc welder 30 is electrically connected to contact tip 13 of torch head 10 and is used to provide power to the tungsten electrode assembly. The welding torch head 10 is used for emitting a pulse laser beam 23 emitted by a pulse laser 20 from a nozzle opening 11 of the welding torch head 10 through a laser lens 22, and meanwhile, a power supply is provided by a TIG electric arc welding machine 30 which is electrically connected with a tungsten electrode assembly through a contact tip 13 so as to discharge the tungsten electrode assembly to generate an electric arc, and the pulse laser beam 23 is positioned in the center of the electric arc.

Generally, the laser source can be continuous laser or pulse laser, and the energy utilization rate of the continuous laser is not high because the photoelectric conversion efficiency of the continuous laser is obviously far lower than that of the pulse laser. Thereby limiting the popularization and application of the continuous laser-arc hybrid welding technology in the actual production.

When high-power continuous laser arc coaxial composite welding is adopted, the following problems exist: 1. the high-power continuous laser energy utilization efficiency is low; 2. the high-power laser has strong reflection and is easy to burn a tungsten electrode; 3. the heat input is large, the welding deformation and the residual stress are large, and the joint structure and the performance are poor.

Therefore, the laser source used in the laser-arc hybrid welding apparatus 100 provided by the present application is a pulse laser, and therefore the pulse laser 20 is selected.

The weld gun head 10 will now be described in detail.

Referring to fig. 2, a torch head 10 includes a torch body 12, a contact tip 13, and a tungsten electrode assembly. The welding gun body 12 is provided with a nozzle opening 11, the contact tip 13 is arranged in the welding gun body 12, and the tungsten electrode assembly is connected with the contact tip 13 and is provided with a through hole 155. Wherein, one end of the welding gun body 12 far away from the nozzle opening 11 is used for being connected with a laser lens 22 to provide a pulse laser beam 23, and the contact tip 13 is used for being electrically connected with a TIG electric arc welding machine 30 to provide electric arc. Therefore, the pulse laser beam 23 generated by the pulse laser 20 can be emitted from the laser lens 22 and then emitted from the nozzle opening 11 of the welding gun body 12 through the through hole 155 of the tungsten electrode assembly, and at the same time, the TIG arc welding machine 30 supplies power and is electrically connected with the tungsten electrode assembly through the contact tip 13, the tungsten electrode assembly discharges electricity to generate an electric arc, and the pulse laser beam 23 is positioned at the center position of the electric arc.

The laser-arc hybrid welding composite mode comprises paraxial composite and coaxial composite. The paraxial combination is that the positions of the laser and the electric arc are combined in a tandem mode, and the structure is simple. However, in the paraxial fusion welding process, the laser and arc heat sources must be kept in the same straight line. The accessibility is not high when the welding gun is used for carrying out back and forth welding aiming at the complex space position, and the welding gun can be continuously welded after the welding gun is operated to other positions and the positions are well adjusted, so that the welding efficiency is greatly reduced.

When the pulsed laser arc paraxial hybrid welding with low power is adopted, the following problems often exist: 1. the electric arc and the laser are distributed front and back, and the laser induction efficiency needs to be improved; 2. the electric arc welding gun and the laser lens are arranged in front and back, so that the composite welding gun is large in structural size and poor in flexibility and accessibility; 3. the shape and the size of the heat source after the laser and the electric arc are compounded are irregular, so that the difficulty of researching the action mechanism of the laser and the electric arc is increased; 4. the keyhole generated by laser is asymmetric in arc voltage, so that the keyhole is easy to collapse, a molten pool is unstable, and welding quality is further affected.

Therefore, the welding torch head 10 of the laser-arc hybrid welding device 100 provided by the present application is in the form of coaxial hybrid welding, so that the pulse laser beam 23 just passes through the center of the arc. In addition, a pulse laser 20 with low power is selected to realize the low-power laser arc composite coaxial welding.

Specifically, contact tip 13 is the hollow cylinder structure, and the central axis of contact tip 13 extends along the transmission direction of laser, and the tungsten utmost point subassembly is connected in the inner chamber of contact tip 13, and the hole 155 that wears of tungsten utmost point subassembly adopts the round hole, and the central axis of wearing hole 155 and the coincidence of the central axis of contact tip 13 to make pulse laser beam 23 just in time launch from the central point of electric arc.

Further, along the laser emission direction, the pulse laser beam 23 emitted from the laser lens 22 is symmetrically distributed with the arc. The welding gun head 10 can be used for ultrahigh-speed welding of metal material sheets, and can also realize low-power laser welding through metal materials of medium and thick plates.

Because the pulse laser beam 23 is in the center of the electric arc, the attraction and compression effects of the pulse laser to the electric arc are more obvious, the energy density of a heat source is higher, the laser keyhole effect is stronger, the penetration capability is higher, and the coaxial composite synergistic effect of the pulse laser and the electric arc is far higher than the paraxial composite mode of the pulse laser and the electric arc.

Further, the tungsten electrode assembly includes a tungsten electrode body 15 and a clamping member 14, the through hole 155 is axially formed in the tungsten electrode body 15, the clamping member 14 is clamped on an outer side wall of the tungsten electrode body 15, and the clamping member 14 is fixedly connected to an inner cavity of the contact tube 13.

In the present embodiment, the holder 14 is screwed to the contact tip 13, and the contact tip 13 is screwed to the torch body 12.

TIG electric arc welding machine 30 provides the power, the electric current is connected with the tungsten electrode subassembly electricity through contact tip 13, the tungsten electrode subassembly discharges and produces the electric arc, pulse laser beam 23 that pulse laser 20 produced jets out from the through hole 155 of tungsten electrode subassembly, make electric arc pressure act on directly over the laser key hole, the electric arc pressure symmetry that the laser key hole received is even, thereby the opening size of key hole is bigger, the key hole is also more stable, can reduce the technological gas pocket that the key hole unstability caused from this, reinforcing molten bath flow's stability, be favorable to improving welding speed.

Further, the tungsten electrode body 15 has a substantially cylindrical structure and includes a first tungsten electrode 152 and a second tungsten electrode 153 fixedly connected to each other, and the second tungsten electrode 153 is located at an end of the gun body 12 close to the nozzle opening 11 with respect to the first tungsten electrode 152.

The first tungsten electrode 152 is a cylindrical structure, the clamping member 14 is clamped on the outer side wall of the first tungsten electrode 152, and one end of the second tungsten electrode 153, which is far away from the first tungsten electrode 152, is a truncated cone-shaped structure. The tungsten utmost point body 15 divide into first tungsten utmost point 152 and second tungsten utmost point 153 fixed connection's mode, when because the live time need be restoreed, when changing the tungsten utmost point body 15 for a long time, only need change the second tungsten utmost point 153 that is located the front end, first tungsten utmost point 152 can not need to be changed to save the cost, and change second tungsten utmost point 153 convenient operation, the practicality is strong.

Wherein, the cross-sectional diameter of the end of the second tungsten electrode 153 remote from the first tungsten electrode 152 in the laser emission direction gradually decreases. The through hole 155 is formed in the axial direction of the tungsten electrode body 15, and the central axis of the through hole 155 coincides with the central axis of the first tungsten electrode 152. The outer diameter of the first tungsten electrode 152 is a fixed size, and the inner diameter of the tungsten electrode body 15 can be selected according to the process requirements.

In the present embodiment, the tungsten electrode 15 has an outer diameter of 8mm and an inner diameter of 2 to 6 mm.

Further, a shielding gas hood 123 is further arranged at one end of the welding gun body 12 close to the nozzle opening 11, and the cross-sectional dimension of the shielding gas hood 123 along the laser emission direction is gradually reduced, so that the shielding gas hood 123 has a tendency of shrinking. The welding torch body 12 is further provided with a shielding gas outlet 122 for supplying shielding gas to the welding torch head 10 through the shielding gas cylinder 40, so as to cool the tungsten electrode body 15 and the protective molten pool.

Correspondingly, the laser-arc hybrid welding device 100 provided by the application further comprises a protective gas cylinder 40. The shielding gas cylinder 40 is connected to the shielding gas outlet 122 of the welding torch body 12 through the shielding gas pipe 45, so that the shielding gas in the shielding gas cylinder 40 is ejected from the shielding gas outlet 122, and the tungsten electrode body 15 during welding can be cooled while protecting the welding pool.

Further, the welding torch body 12 is further provided with a wire feeding pipe 121, the wire feeding pipe 121 is located in the inner cavity of the welding torch body 12 and extends toward the nozzle opening 11, and the wire feeding pipe 121 is used for guiding the welding wire fed by the wire feeder 50 so that the welding wire is smoothly fed to the welding position of the nozzle opening 11.

Optionally, during specific welding, two modes of wire filling welding and self-fluxing welding can be selected according to actual conditions, and the application is not limited.

In contrast, the laser-arc hybrid welding apparatus 100 provided by the present application further includes a wire feeder 50. The welding gun body 12 is provided with a wire feeding pipe 121, and the wire feeder 50 feeds a welding wire to the nozzle opening 11 of the welding gun head 10 through the wire feeding pipe 121, so that a welding mode is selected according to welding requirements for welding.

The laser-arc hybrid welding device 100 provided by the application can make any position change of 360 degrees of rotation due to the coaxial symmetrical structure of the pulse laser and the electric arc, and reduces the position adjusting procedures of the welding gun and the pulse laser beam 23 before welding of each welding line during paraxial hybrid welding, thereby increasing the accessibility of the welding gun head 10, realizing various welding sequences in complex spatial position welding, reducing the workload, eliminating the working error, shortening the preparation time before welding, and further improving the welding efficiency.

Further, the laser arc hybrid welding apparatus 100 provided by the present application further includes a controller and a robot arm 60. The controller is electrically connected with the robot arm 60, the welding gun head 10 is fixedly arranged on the robot arm 60, the robot arm 60 drives the welding gun head 10 to move, and the controller is used for controlling the walking speed and the walking path of the robot arm 60 and further controlling the welding speed and the welding path of the welding gun head 10.

Referring to fig. 1, the welding gun head 10 and the laser lens 22 of the pulse laser 20 are fixed by a screw, and before the screw is locked and fixed, the welding gun head 10 is moved left and right in the front and back directions to ensure that the pulse laser beam 23 smoothly passes through the through hole 155 of the tungsten electrode 15, the pulse laser 20 transmits the low-power pulse laser required for welding to the laser lens 22 through the optical fiber, and the low-power pulse laser is emitted from the through hole 155 of the welding gun head 10 through the laser lens 22, and the TIG electric arc welder 30 provides a power supply.

The composite heat source provided by the laser-arc composite welding device 100 is more symmetrical, which is beneficial to analyzing the interaction mechanism of the pulse laser and the electric arc; the pulse laser has a single pulse peak value, the power is high, the average output power is low, the photoelectric conversion efficiency is high, and the energy consumption of a welding line in unit length is low; the single pulse energy is high, the melting depth is large, and the method can be used for welding thin and medium plates by low-power laser; the total welding heat input is small, the heat affected zone is narrow, the welding deformation is small, the residual stress is small, and the joint strength is high; can be for thin sheets and ultra-thin sheets of, for example, 0.5 mm; in addition, the laser power is low, and the burning loss of the tungsten electrode assembly caused by laser reflection is small.

The composite welding method of the laser-arc composite welding device 100 provided by the application comprises the following welding steps: laser welding and arc welding are simultaneously performed on one of the portions of the member to be welded 01, and the pulse laser beam 23 passes through the middle of the arc.

Specifically, the laser is a pulse laser, and the arc is a TIG arc.

The method specifically comprises the following steps:

firstly, a preparation step, cleaning the position to be welded of the part 01 to be welded before welding, and assembling and positioning the part 01 to be welded.

Secondly, a parameter setting step, namely selecting laser parameters of the pulse laser 20 according to the type and the thickness of a material to be welded, such as excitation current (100-200A), pulse width (0.5-5 ms), pulse frequency (10-50 hz), single pulse energy and the like; meanwhile, selecting power supply parameters of the TIG arc welding machine 30, such as arc current value (100-300A), voltage value (20-60V), welding gun angle and the like; in addition, other process parameters are selected, such as defocusing amount (-5 mm), tungsten electrode inner diameter (1-5 mm), welding speed, shielding gas flow size (10-30L/min), and the like.

And thirdly, a path setting step of editing the traveling path of the robot arm 60 by the controller to determine the welding start point position and the welding end point position.

Fourthly, starting welding, and welding the to-be-welded part 01 by the welding gun head 10 under the action of the robot arm 60.

The welding gun head 10, the laser-arc hybrid welding device 100 and the method provided by the embodiment of the application have the beneficial effects that:

the pulse laser and electric arc coaxial composite welding has the advantages that the energy density of a heat source is higher, the laser keyhole effect is stronger, the penetration capability is higher, the keyhole is symmetrical and uniform under the electric arc pressure, the keyhole is more stable, the flowing stability of a molten pool is improved, and the energy utilization rate is enhanced; the total welding heat input is small, the welding deformation is small, the residual stress is small, the welding gun head 10 can be changed at any position, the accessibility of a welding gun is increased, the workload is reduced, the working error is eliminated, the preparation time before welding is shortened, and the welding efficiency is improved.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A welding gun head is characterized by comprising a welding gun body, a conductive nozzle and a tungsten electrode assembly;

2. The torch head of claim 1, wherein the tungsten electrode assembly comprises a tungsten electrode body and a clamping member, the tungsten electrode body comprises a first tungsten electrode and a second tungsten electrode which are fixedly connected, the second tungsten electrode is close to the nozzle opening relative to the first tungsten electrode, the clamping member is clamped in the first tungsten electrode and connected to the inner cavity of the contact tip, the cross-sectional diameter of one end, far away from the first tungsten electrode, of the second tungsten electrode is gradually reduced along the laser emission direction, and the through hole is formed along the axial direction of the tungsten electrode body.

3. A laser-arc hybrid welding device, characterized by comprising a pulse laser, a TIG arc welder and a torch head according to claim 1 or 2;

4. The hybrid laser-arc welding apparatus according to claim 3, wherein the tungsten electrode assembly includes a tungsten electrode body, the through hole is formed in an axial direction of the tungsten electrode body and is a circular hole, the tungsten electrode body is capable of generating an arc by the TIG arc welder, and the pulse laser generated by the pulse laser is capable of being emitted from a center position of the through hole so that the pulse laser is positioned at the center position of the arc.

5. A laser-arc hybrid welding method is characterized by comprising the following welding steps:

6. The laser arc hybrid welding method of claim 5, wherein said laser is a pulsed laser.

7. The laser-arc hybrid welding method according to claim 5, characterized in that the arc is a TIG arc.

8. The laser arc hybrid welding method according to claim 5, characterized by comprising, before said welding step, a parameter setting step of:

9. The laser arc hybrid welding method according to claim 8, further comprising a preparation step before the parameter setting step of:

and cleaning, assembling and positioning the part to be welded before welding.

10. The laser arc hybrid welding method according to claim 8, further comprising a path setting step between said welding step and said parameter setting step: