CN114515883A - Welding device - Google Patents

Abstract

The application discloses a welding device, which comprises a first support, a driving assembly, a welding gun assembly, a second support and a welding seam tracking sensor; the welding seam tracking sensor is fixed on the first bracket, and the driving assembly is fixed on the first bracket; the welding gun assembly is arranged on the second support, the driving assembly is configured to drive the second support to rotate relative to the first support so as to drive the welding gun assembly to swing relative to the welding seam tracking sensor, and the detection precision of the welding seam tracking sensor is improved because the welding seam tracking sensor on the first support is relatively fixed in the swinging process of the welding gun assembly.

Description

Welding device

Technical Field

The application relates to the technical field of welding, in particular to a welding device.

Background

During the welding process, the welding head of the welding gun often needs to swing back and forth between two sides of the weld (from one side of the weld to the other side of the weld, and back from the other side of the weld) while the welding gun moves along the weld. The reciprocating oscillation of the welding head is used for controlling the flow of the welding molten metal and obtaining the necessary welding seam width, thereby improving the welding quality.

Along with the development of production, the requirement on the welding quality of products is higher and higher, and meanwhile, the labor intensity of workers is required to be improved, and automatic welding is the current development direction. The automatic welding drives the welding gun to move through the mechanical arm or the industrial robot, and a welding seam tracking sensor is needed to detect the welding seam in the automatic welding process, so that the welding gun is guided to move.

In the automatic welding process, how to control the flow of the welding molten metal and obtain the necessary weld width without influencing the detection precision of the weld tracking sensor due to the swing of a welding head is a technical problem to be solved in the field.

Disclosure of Invention

One of the embodiments of the present application provides a welding device, which includes a first support, a driving assembly, a welding gun assembly, a second support, and a weld tracking sensor; the welding seam tracking sensor is fixed on the first bracket, and the driving assembly is fixed on the first bracket; the welding gun assembly is arranged on the second support, and the driving assembly is configured to drive the second support to rotate relative to the first support so as to drive the welding gun assembly to swing relative to the welding seam tracking sensor.

In some embodiments, the weld tracking sensor includes a laser for emitting laser light, the second support having a hollow interior cavity, the laser being at least partially received in the interior cavity.

In some embodiments, the second stent includes an arcuate portion having an intrados surface facing the first stent, the lumen being formed between the intrados surface and the first stent.

In some embodiments, one end of the first support, which is close to the welding gun assembly, is provided with a first mounting portion, the first mounting portion is provided with a receiving hole, the laser is received in the receiving hole, and the arc-shaped portion surrounds the outside of the first mounting portion.

In some embodiments, the first bracket is provided with a receiving groove, and the driving assembly is at least partially received in the receiving groove.

In some embodiments, the weld tracking sensor further comprises a camera located at an end of the first support remote from the welding assembly, the camera configured to receive the reflected laser light emitted by the laser.

In some embodiments, the second support further comprises an annular portion connected to the arcuate portion, the welding gun assembly being secured to the annular portion.

In some embodiments, the arcuate portion is positioned above the first bracket and the annular portion is positioned forward of the first bracket.

In some embodiments, the curvature of the inner annular surface of the annular portion is the same as the curvature of the intrados surface of the arcuate portion.

In some embodiments, the welding gun assembly includes a welding head seat and a welding head, the welding head seat includes a second mounting portion and a third mounting portion connected to each other, the second mounting portion is used for being connected with the second bracket, and the third mounting portion is used for being connected with the welding head.

In some embodiments, the third mounting portion is tubular; the welding gun assembly further comprises a welding wire guide pipe for a welding wire to pass through, and the welding wire guide pipe passes through the pipe of the third installation part and enters the welding head.

In some embodiments, an insulating member is disposed between the second mounting portion and the second bracket.

In some embodiments, the drive assembly includes a motor, an encoder coupled to the motor, and a reducer coupled between the motor and the second bracket; wherein the encoder is at least used for detecting the rotation angle of the output shaft of the motor.

Drawings

The present application will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, in that, like numerals indicate like structures,

wherein:

FIG. 1 is a perspective view of a welding device according to some embodiments of the present application;

FIG. 2 is a cross-sectional view of a welding device according to some embodiments of the present application;

FIG. 3 is a schematic structural view of a second bracket of a welding device according to some embodiments of the present application;

FIG. 4 is a schematic diagram of a first mount and laser according to some embodiments of the present application;

FIG. 5 is a schematic structural view of a first bracket according to some embodiments of the present application;

FIG. 6 is a schematic diagram of a welded assembly according to some embodiments of the present application.

Description of reference numerals: 100. a first bracket; 200. a second bracket; 300. a drive assembly; 400. a welding gun assembly; 500. a weld tracking sensor; 110. a first mounting portion; 111. an accommodation hole; 120. accommodating grooves; 210. an arc-shaped portion; 211. an intrados surface; 220. an annular portion; 310. a motor; 320. a speed reducer; 330. an encoder; 410. a solder head seat; 411. a second mounting portion; 412. a third mounting portion; 420. a welding head; 430. a wire guide; 510. a laser; 520. a camera is provided.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

On the contrary, this application is intended to cover any alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the application as defined by the appended claims. Furthermore, in the following detailed description of the present application, certain specific details are set forth in order to provide a better understanding of the present application. It will be apparent to one skilled in the art that the present application may be practiced without these specific details.

During the welding process, the horn of the welding assembly often needs to oscillate back and forth between the two sides of the weld (from one side of the weld to the other side of the weld and back from the other side of the weld) while the welding assembly is moving along the weld. The reciprocating oscillation of the welding head is used for controlling the flow of the welding molten metal and obtaining the necessary welding seam width, thereby improving the welding quality. In the process of welding thick steel plates, in the process of butt joint in flat welding, overhead welding or vertical welding and in the process of fillet joint in vertical welding, the welding head needs to swing back and forth. In automatic welding, except that the welding subassembly, still need to set up the welding seam and track the sensor and track the welding seam, on arm or industrial robot can all be located to welding seam tracking sensor and welding subassembly, arm or industrial robot's controlgear can be according to the motion that the detection data of welding seam tracking sensor come the control welding subassembly. In some embodiments, to effect oscillation of the horn of the welding assembly, the welding assembly and the weld tracking sensor are both mounted on a rotatable carriage, and the weld tracking sensor oscillates with the welding assembly as the rotatable carriage oscillates the welding assembly. Among them, the swing of the seam tracking sensor may affect the detection accuracy of the seam. Some embodiments of the present application provide a welding device, which sets a welding assembly on a second support by setting a weld seam tracking sensor on a first support, and when a driving assembly drives the second support to rotate relative to the first support, the welding assembly swings and the weld seam tracking sensor is relatively fixed. Therefore, the welding requirement is met, and the detection precision of the welding seam tracking sensor is ensured. The welding device of this application can install on devices such as arm or industrial robot (if install on devices such as arm or industrial robot through first support) to realize automatic welding.

FIG. 1 is a perspective view of a welding device according to some embodiments of the present application; FIG. 2 is a cross-sectional view of a welding device according to some embodiments of the present application. A welding apparatus according to an embodiment of the present application will be described in detail below with reference to fig. 1 to 2. It should be noted that the following examples are only for explaining the present application and do not constitute a limitation to the present application.

In an embodiment of the present application, as shown in fig. 1-2, the present application provides a welding device comprising a first support 100, a drive assembly 300, a torch assembly 400, a second support 200, and a weld tracking sensor 500. The seam tracking sensor 500 is fixed to the first bracket 100, and the driving assembly 300 is fixed to the first bracket 100; the welding torch assembly 400 is disposed on the second support 200, and the driving assembly 300 is configured to drive the second support 200 to rotate relative to the first support 100, so as to drive the welding torch assembly 400 to swing relative to the seam tracking sensor 500.

In the present embodiment, the torch assembly 400 may include a torch seat 410 and a welding head 420. The torch assembly 400 may be a torch assembly 400 for electric welding or may be a torch assembly 400 for gas welding. Preferably, the torch assembly 400 is used for gas shielded electric welding. When the welding head 420 is a gas shielded welding head 420, the welding head 420 may include a nozzle, a contact tip holder, a contact tip, a gas diffusion structure, a wire guide, and the like, attached to the second bracket 200. The conductive nozzle seat, the conductive nozzle and the gas diffusion structure are all arranged in the nozzle. The wire guide 430 is used to pass the welding wire therethrough so that the welding wire reaches the contact tip of the welding head 420. The welding wire is fed from the wire holder 410 through a wire conduit to the contact tip of the welding head 420. The tip seat 410 may be connected to a power source, and the tip seat and tip direct current to the wire. In the welding wire melting process, the welding head sprays out flame, and the spraying direction of the flame is consistent with the length direction of the welding head. The gas diffusion device is capable of diffusing the inert gas so that the inert gas can shield the arc.

The driving assembly 300 may have an output shaft connected to the second bracket 200, so that the second bracket 200 also rotates along the output shaft, which is a rotating shaft of the second bracket, and the second bracket 200 drives the welding gun assembly 400 to swing. As the weld gun assembly oscillates, the weld head oscillates with it, allowing the front end of the weld head (e.g., the contact tip of the weld head) to oscillate back and forth between the two sides of the weld (from one side of the weld to the other side of the weld, and back from the other side of the weld). In some embodiments, the length direction of the welding head 420 is not parallel to the rotation axis direction of the second support 200, so that the end of the welding head 420 away from the second support 200 is not located on the rotation axis of the second support 200, and thus the end of the welding head 420 away from the second support 200 swings in an arc around the rotation axis of the second support 200 during the swinging of the welding gun assembly 400. For example, as shown in fig. 2, an angle a between a length direction of the horn (a direction of an oblique dotted line in fig. 2) and an extending direction of the rotation axis of the second bracket 200 (a direction of a horizontal dotted line in fig. 2) may be 30 ° to 100 °. Preferably, the included angle a may be 60 °. In some embodiments, the driving assembly 300 is configured to drive the second support 200 to rotate reciprocally with respect to the first support 100 to oscillate the welding gun assembly 400 reciprocally, thereby forming a weld having a width during movement of the welding gun assembly 400 along the weld.

In some embodiments, the weld tracking sensor 500 and the driving device may be connected to the first bracket 100 by clamping, screwing, bonding, welding, or the like, and the welding gun assembly 400 may also be connected to the second bracket 200 by clamping, screwing, bonding, welding, or the like, which is not further limited in this application.

In some embodiments, the first carriage 100 may be connected to a robotic arm or an industrial robot that may move the entire welding device. In other embodiments, the driving assembly 300 may not be fixed to the first carriage 100, and the first carriage 100 and the second carriage 200 may be provided to two robot arms, respectively, or two industrial robots, respectively.

In the present embodiment, the seam tracking sensor 500 is used to track the seam, and since the welding assembly can be connected to a robot arm or an industrial robot, a control device of the robot arm or the industrial robot can control the movement of the welding assembly according to the detection data of the seam tracking sensor. The seam tracking sensor 500 may include a camera 520 and a laser 510, the laser 510 emits laser to the seam of the welding workpiece, the camera 520 is configured to receive the laser reflected by the welding workpiece, and the laser returned from the seam of the welding workpiece irradiates the camera 520, so as to obtain an image of the seam, so as to track the seam. Camera 520 may include a camera, video camera, or other device capable of imaging. The weld tracking sensor may further include a mirror configured to reflect laser light emitted by the laser 510 out through the laser exit window to effect illumination of a weld on a welded workpiece. In some embodiments, to protect the camera 520 from high temperature impact during welding, the camera 520 may be located at an end of the first bracket 100 away from the welded assembly. While the imaging effect is ensured, the arrangement position of the camera 520 can be as close to the driving assembly as possible, so that the structure of the welding device is more compact.

In some embodiments, the second stent 200 has a hollow lumen. Laser 510 is at least partially housed within the lumen, i.e., laser 510 may be completely housed within the lumen or only partially housed within the lumen with another portion outside the lumen. The inner cavity protects the laser 510 contained therein, effectively protecting the laser 510 from high temperature shock during the welding process. The shape of the lumen may be curved, square or any other shape. The shape of the inner cavity is preferably an arc (e.g., circular arc or elliptical arc), and the arc-shaped inner cavity can reduce the volume of the second holder 200 while ensuring that the second holder 200 does not interfere with the laser 510 during the rotation of the second holder 200. In some embodiments, when the inner cavity has an arc shape (e.g., a circular arc shape or an elliptic arc shape), the rotation axis of the second bracket 200 may be parallel to the axis of the cylinder corresponding to the circular arc surface or parallel to the axis of the elliptic cylinder corresponding to the elliptic arc surface. In some alternative embodiments, when the inner cavity has an arc shape (e.g., circular arc or elliptical arc), the rotation axis of the second support 200 may have a smaller angle with the axis of the cylinder corresponding to the circular arc surface, or may have a smaller angle, for example, an angle smaller than 5 °, parallel to the axis of the elliptical cylinder corresponding to the elliptical arc surface.

In some embodiments, the first bracket 100 and the second bracket 200 have a gap with a preset width therebetween, so that the second bracket 200 can rotate within a preset angle range. The preset angle range may be understood as an interval of the maximum angle of the second bracket 200. The predetermined angle range can be set by one skilled in the art according to welding requirements (such as the requirement of the width of the weld). For example, in some embodiments, the predetermined angle may range from-10 to 10. That is, the preset angle range in which the second bracket 200 is rotated may be controlled by setting the width of the gap. The above gap may be understood as the shortest distance between the first bracket 100 and the second bracket 200. In other embodiments, the gap between the first bracket 100 and the second bracket 200 may be larger. At this time, the rotation angle range of the second supporter 200 may be controlled by the driving assembly 300.

FIG. 3 is a schematic diagram of a second bracket of a welding device according to some embodiments of the present application. As shown in fig. 3, the second bracket 200 includes an arc portion 210, the arc portion 210 has an inner arc surface 211 facing the first bracket 100, the inner arc surface 211 is an arc surface or an elliptical arc surface, and an inner cavity is formed between the inner arc surface 211 and the first bracket 100. In some embodiments, arcuate portion 210 may also have an extrados surface that conforms to the shape of intrados surface 211. Alternatively, the shape of the outer side of arc 210 may be different from the shape of intrados 211, e.g., the outer side of arc 210 may include a planar or irregular surface.

FIG. 4 is a schematic diagram of a first support and a laser according to some embodiments of the present application. As shown in fig. 4, the first holder 100 is provided at an end thereof adjacent to the torch assembly 400 with a first mounting portion 110, the first mounting portion 110 is provided with a receiving hole 111, the laser 510 is received in the receiving hole 111, and the arc portion 210 surrounds the first mounting portion 110. In some embodiments, the first mounting portion 110 may be a boss protruding on a surface of the first bracket 100. For example, a boss projecting upwardly from the upper surface or a boss projecting forwardly from the front surface.

In some embodiments, in order to ensure smooth emission of the laser light emitted from the laser 510, the first mounting portion 110 is provided with an emission hole communicating with the receiving hole 111, and the laser light emitted from the laser 510 can be emitted from the emission hole toward the welding workpiece.

FIG. 5 is a schematic structural view of a first stent according to some embodiments of the present application. As shown in fig. 1 and 5, the first bracket 100 is provided with a receiving groove 120, and the driving assembly 300 is at least partially received in the receiving groove 120. Through set up holding tank 120 on first support 100, can be so that whole welding set's structure is compacter, and the volume is littleer, and holding tank 120 also can protect drive assembly 300, effectively reduces the high temperature impact that drive assembly 300 in the welding process received.

In some embodiments, the welding device may further include a housing, and the first support 100, the second support 200, the weld tracking sensor 500, and the drive assembly 300 may all be housed within the housing, and the housing may be provided with an opening that may allow the laser light to be directed to and returned from the weld of the weldment work to be directed to the camera 520. The housing may better protect the various components of the welding device.

In some embodiments, as shown in fig. 3, the second support 200 further includes a ring portion 220 connected to the arc portion 210, and the torch assembly 400 is secured to the ring portion 220. By the design of the ring portion 220, the contact area between the second bracket 200 and the welding assembly may be increased, so that the welding assembly may be more stably coupled to the second bracket 200. The annular portion 220 and the arc portion 210 may be connected together by welding, bonding, or the like, or the entire second bracket 200 may be integrally formed.

In some embodiments, the arcuate portion 210 is positioned above the first bracket 100 and the annular portion 220 is positioned forward of the first bracket 100. By thus arranging the relative positions of the first holder 100 and the second holder 200, while it is ensured that the arc portion 210 can surround the laser 510 to protect the laser 510, the ring portion 220 and the torch assembly 400 do not interfere with the first holder 100 during the rotation of the second holder 200, the entire welding apparatus is compact in structure, and the welding operation can be stably performed.

In some embodiments, the inner annular surface of the annular portion 220 has the same curvature as the inner arcuate surface 211 of the arcuate portion 210. The same curvature can be understood as the degree of curvature of the inner annular surface and the intrados surface. In some embodiments, the outer contour of the annular portion 220 is circular, and the outer arc surface of the arc portion 210 is a circular arc surface. The outer contour of the ring portion 220 may have the same curvature as the outer arc surface of the arc portion 210. When the inner annular surface of the annular portion 220 has the same curvature as the inner arc surface 211 of the arc portion 210, the inner surface (including the inner annular surface and the inner arc surface 211) of the second stent 200 can be more easily processed, and similarly, when the outer contour of the annular portion has the same curvature as the outer arc surface of the arc portion 211, the outer surface (including the outer contour and the outer arc surface of the annular portion 220) of the second stent 200 can be more easily processed.

When the inner arc surface 211 of the arc portion 210 is an arc surface, the axis of the annular portion 220 is parallel to the axis of the cylinder corresponding to the arc surface. Preferably, the axis of the annular portion 220 coincides with the axis of the cylinder corresponding to the circular arc surface. When the intrados 211 of the arc portion 210 is an elliptical arc, the axis of the ring portion 220 is parallel to the axis of the corresponding elliptical cylinder of the elliptical arc. Preferably, the axis of the annular portion 220 coincides with the axis of the elliptic cylinder corresponding to the elliptic arc. The curvature and relative position of the annular portion 220 and the arc portion 210 are set, so that the whole second bracket 200 is convenient to machine and manufacture and stable in structure. In particular, when the curvature of the annular portion 220 is the same as that of the arc portion 210, and the axis of the annular portion 220 coincides with the axis of the cylinder (elliptic cylinder) corresponding to the circular arc surface (elliptic arc), the second bracket 200 may be integrally formed and may be more conveniently manufactured.

Fig. 6 is a schematic structural diagram of a welding assembly according to some embodiments of the present application, and as shown in fig. 6, the welding gun assembly 400 further includes a welding head seat 410 and a welding head 420, the welding head seat 410 includes a second mounting portion 411 and a third mounting portion 412 connected to each other, the second mounting portion 411 is detachably connected to the second bracket 200, and the third mounting portion 412 is used for connecting the welding head 420. By providing the second mounting portion 411 to be detachably coupled to the second bracket 200, the welding gun assembly 400 can be easily repaired or replaced. The weld head 420 may be attached to the third mount portion 412 by snapping, threading, bonding, welding, or the like. In some embodiments, the outer profile of the second mounting portion 411 may match the outer profile of the annular portion 220 to maximize the contact area between the second mounting portion 411 and the annular portion 220. For example, when the ring portion 220 of the second bracket 200 is a circular ring, the second mounting portion 411 may have a disk shape.

In some embodiments, the third mounting portion 412 is tubular; the welding head 420 is attached to the tubular third mount portion 412. Preferably, the welding head 420 is mounted to the third mounting portion 412 by a snap fit or threaded connection, or the like. In some embodiments, a wire conduit may be provided through the third mount 412 into the welding head 420, the wire conduit passing through the tube of the third mount 412 and into the welding head 420, the welding wire passing through the wire conduit to the welding head 420. By providing the tubular third mounting part 412, the third mounting part 412 can effectively protect the welding wire passing therethrough.

In some embodiments, a cooling structure may be disposed on the tubular third mounting portion 412, for example, a cooling pipe may be disposed around the inner surface of the tubular third mounting portion 412, and after the coolant is introduced into the cooling pipe, the temperature of the third mounting portion 412 may be reduced.

In some embodiments, the angle of the included angle between the axis of the tubular third mount part 412 and the direction of the rotating shaft in which the second bracket 200 rotates may be less than 180 °, and the welding head 420 may be inserted into the third mount part 412, so that the angle of the included angle a between the length direction of the welding head 420 and the rotating shaft in which the second bracket 200 rotates may be 30 to 100 °.

In some embodiments, the third mounting portion 412 may be connected to a power source and the welding head 420 powered. An insulating member is provided between the second mounting portion 411 and the second bracket 200. The insulating member can perform an insulating function to separate the respective electric conductors. The insulating member may be made of ceramic, rubber, or the like. In the present embodiment, since both of the pad holder 410 and the second holder 200 may be conductive bodies, the insulating member can effectively prevent current from being transferred from the pad holder 410 to the second holder 200, thereby securing safety of an operator and ensuring stable operation of each component of the welding apparatus.

In some embodiments, the driving assembly 300 includes a motor 310, an encoder 330 connected to the motor 310, and a decelerator connected between the motor 310 and the second carriage 200. In some embodiments, the motor and the reducer are coaxially disposed, such that the driving assembly 300 is simple in structure and convenient to arrange. In the present embodiment, the motor 310 serves as a driving source of the driving assembly 300. In other embodiments, a hydraulic cylinder, a pneumatic cylinder, or the like may also be used as the drive source. The encoder 330 is used at least to detect the rotation angle of the output shaft of the motor 310. The encoder 330 associated with the motor 310 may be understood as a rotary sensor that converts the rotational displacement into digital pulse signals that can be used to detect and control the angular displacement of the output shaft of the motor 310. By providing the encoder 330 connected to the motor 310, the rotational speed of the output shaft of the motor 310 can be measured, and the rotational angle of the output shaft of the motor 310 can be detected. For example, zero correction at the start of welding may be applied by encoder 330. Preferably, the speed reducer 320 may be a planetary gear speed reducer 320, and the planetary gear speed reducer 320 may make the driving assembly 300 more compact, thereby reducing the volume of the welding device. In other embodiments, the speed reducer 320 may be a helical gear speed reducer 320, a worm gear speed reducer 320, or the like. In some embodiments, the reducer 320 and the hollow bracket may be connected by a bearing and a flange.

The welding device disclosed in the present application may bring beneficial effects including but not limited to: (1) the driving assembly drives the second support to rotate, so that the welding assembly is driven to swing, the first support does not swing together with the second support, and the detection precision of the welding seam tracking sensor arranged on the first support can be guaranteed; (2) the welding seam tracking sensor is well protected, and the welding seam tracking sensor is effectively prevented from being impacted by high temperature; (3) the welding device is compact in structure and small in size, and can realize welding operation in a narrow space. It is to be noted that different embodiments may produce different advantages, and in different embodiments, any one or combination of the above advantages may be produced, or any other advantages may be obtained.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (13)

1. A welding device is characterized by comprising a first support, a driving assembly, a welding gun assembly, a second support and a welding seam tracking sensor;

the welding seam tracking sensor is fixed on the first bracket, and the driving assembly is fixed on the first bracket;

the welding gun assembly is arranged on the second support, and the driving assembly is configured to drive the second support to rotate relative to the first support so as to drive the welding gun assembly to swing relative to the welding seam tracking sensor.

2. The welding device of claim 1, wherein the weld tracking sensor comprises a laser for emitting laser light, the second support having a hollow interior cavity, the laser being at least partially received in the interior cavity.

3. The welding device of claim 2, wherein the second leg includes an arcuate portion having an intrados surface facing the first leg, the internal cavity being formed between the intrados surface and the first leg.

4. The welding device according to claim 3, wherein a first mounting portion is provided at an end of the first bracket adjacent to the welding gun assembly, a receiving hole is provided in the first mounting portion, the laser is received in the receiving hole, and the arc portion surrounds the first mounting portion.

5. The welding apparatus of claim 1, wherein the first support defines a receiving slot, and wherein the drive assembly is at least partially received within the receiving slot.

6. The welding device of claim 3, wherein the weld tracking sensor further comprises a camera positioned on an end of the first support distal from the welding assembly, the camera configured to receive the reflected laser light emitted by the laser.

7. The welding apparatus of claim 3 wherein said second support further comprises an annular portion connected to said arcuate portion, said torch assembly being secured to said annular portion.

8. The welding device of claim 7, wherein said arcuate portion is positioned above said first support and said annular portion is positioned forward of said first support.

9. The welding device of claim 8, wherein the curvature of the inner annular surface of the annular portion is the same as the curvature of the inner arcuate surface of the arcuate portion.

10. The welding device according to claim 1, wherein the welding gun assembly includes a welding head seat and a welding head, the welding head seat includes a second mounting portion and a third mounting portion connected to each other, the second mounting portion is configured to be connected to the second bracket, and the third mounting portion is configured to be connected to the welding head.

11. The welding device of claim 10, wherein the third mounting portion is tubular; the welding gun assembly further comprises a welding wire guide pipe for a welding wire to pass through, and the welding wire guide pipe passes through the pipe of the third installation part and enters the welding head.

12. The welding device of claim 10, wherein an insulating member is disposed between the second mounting portion and the second support.

13. The welding device of claim 1, wherein the drive assembly includes a motor, an encoder coupled to the motor, and a reducer coupled between the motor and the second support; wherein the encoder is at least used for detecting the rotation angle of the output shaft of the motor.

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