Welding method and welding equipment

Abstract

The invention provides a welding method and welding equipment. The welding method comprises the steps that stirring welding is conducted, specifically, a tungsten needle in a welding gun is rotated, and the tip end of the tungsten needle is made to swing; the tip end of the tungsten needle is inserted into a molten pool of the weld joint to stir the molten pool, and the tip end of the tungsten needle can point to the two opposite side walls of the weld joint in the stirring process to reduce the surface tension of the molten pool; wherein the rotating speed of the tungsten needle is 500-8000 rpm / min. According to the scheme, when the tungsten needle in the welding gun rotates, the tip end of the tungsten needle swings, when the tungsten needle swings, the tip end of the tungsten needle can point to the two opposite side walls of the welding seam, the surface tension of a molten pool is destroyed, liquid welding flux extends towards the side walls of the welding seam, the welding area of single-time welding is enlarged, the coverage range of an electric arc is enlarged by rotating the tungsten needle, and the welding efficiency is improved. The welding speed is obviously increased, and the production efficiency is improved; and meanwhile, the rotating arc uniformly distributes heat, so that welding defects are reduced, and the compactness and strength of a welding seam are improved.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and in particular, to a welding method and a welding device. Background Art

[0002] At present, welding technology is widely used in fields such as manufacturing, aerospace, etc. The more precise the equipment, the higher the technical requirements for the welding process. Among them, hot wire welding, as an efficient welding method, can improve the melting speed by heating the welding wire, thereby significantly improving the welding efficiency and the quality of the weld seam.

[0003] However, in the prior art, due to the surface tension of the liquid solder during welding, the welding area for each welding is limited, and it is often necessary to perform multiple weldings on the weld seam, resulting in low welding efficiency; multiple weldings may cause stress concentration and are prone to the cumulative effect of the heat affected zone, leading to a decline in the physical properties of the welding area and affecting the overall quality of the welded part. Summary of the Invention

[0004] The present invention provides a welding method and a welding device to solve the problem of low weld quality and welding efficiency caused by the surface tension of the liquid solder during welding in the prior art.

[0005] To solve the above problems, according to one aspect of the present invention, a welding method is provided, including: stirring welding: rotating the tungsten needle in the welding torch and making the tip of the tungsten needle swing; inserting the tip of the tungsten needle into the molten pool of the weld seam to stir the molten pool. During the process of stirring the molten pool, the tip of the tungsten needle can point to two opposite side walls of the weld seam respectively to reduce the surface tension of the molten pool; wherein, the rotation speed of the tungsten needle is 500 - 8000 rpm / min.

[0006] Further, the side walls of the weld seam include arc-shaped walls and flat walls. The two arc-shaped walls of the two opposite side walls of the weld seam are arranged oppositely, and the two flat walls of the two opposite side walls of the weld seam are arranged oppositely, wherein the included angle between the two flat walls is less than 20 degrees.

[0007] Further, the two flat walls are parallel to each other, and the distance between the two flat walls is 12 to 15 mm.

[0008] Further, during the welding process, 100% inert gas is used as the shielding gas, and at least two are simultaneously supplied to the weld seam.

[0009] Further, before the welding wire is supplied to the weld seam, the welding wire is heated, or the welding wire is heated and vibrated.

[0010] Further, during the welding process, a single welding torch is used for welding, or multiple welding torches are used to weld one weld seam.

[0011] Further, a plurality of welding torches are used to weld a weld seam. The plurality of welding torches include a front torch and at least one rear torch. Among them, the type of the front torch can be replaced with a deep penetration argon arc welding torch or a high-speed rotating argon arc welding torch, and the type of the rear torch is a high-speed rotating argon arc welding torch. The deep penetration argon arc welding torch is used for backing welding of the weld seam, and the high-speed rotating argon arc welding torch is used for filling and capping welding of the weld seam. The tungsten needle of the high-speed rotating argon arc welding torch can rotate and swing to stir the molten pool.

[0012] Further, the welding method further includes a backing step, and the backing step includes: determining the distance between the front torch and the rear torch, using the deep penetration argon arc welding torch for the front torch, and the front torch and the rear torch moving synchronously along the extending direction of the weld seam; the front torch starts arc, and feeds the welding wire to the tip area of the front torch to perform full penetration backing welding; the rear torch moves to the position welded by the front torch to start arc by the contact method. At this time, a molten pool is formed, and the welding wire is fed to the tip area of the rear torch; among them, the high-speed rotating argon arc welding torch operates using stirring welding.

[0013] Further, during the movement of the rear torch, the whole rear torch swings along the width direction of the weld seam; after the front torch welds the weld seam once, it stops arc, and after the rear torch welds the weld seam once, it stops arc.

[0014] Further, after the backing step is completed, the welding method further includes a filling / capping step, and the filling / capping step includes: determining the distance between the front torch and the rear torch, replacing the front torch with a high-speed rotating argon arc welding torch, and the front torch and the rear torch moving synchronously along the extending direction of the weld seam; the front torch starts arc, and feeds the welding wire to the tip area of the front torch. During the movement of the front torch, the whole front torch swings along the width direction of the weld seam; the rear torch moves to the position welded by the front torch to start arc by the contact method, feeds the welding wire to the tip area of the rear torch, and during the movement of the rear torch, the whole rear torch swings along the width direction of the weld seam; among them, the high-speed rotating argon arc welding torch operates using stirring welding.

[0015] According to another aspect of the present invention, a welding device is provided. The welding device adopts the above-mentioned welding method. The welding device includes a welding torch and a wire feeding torch. The welding torch includes a torch body, a tungsten needle, a driving component, and a limiting component. The tungsten needle, the driving component, and the limiting component are all installed on the torch body. The driving component is movably connected to the tungsten needle, and the driving component drives the tungsten needle to revolve. The limiting component limits the tungsten needle to make the tip of the tungsten needle swing during the revolution.

[0016] Further, the driving assembly includes a first connecting member, which is rotatably arranged. The first connecting member is movably connected to one end of the tungsten needle away from the tip to drive the tungsten needle to revolve. The limiting member and the driving assembly are arranged at intervals along the axis direction of the gun body. The limiting member has a through hole, and the tungsten needle passes through the through hole. The hole wall surface of the through hole limits the tungsten needle. The hole wall surface of the through hole includes a first wall surface and a second wall surface connected to each other. The first wall surface is a first arc surface, and the second wall surface is a plane. When the tungsten needle is in contact with the plane, the tungsten needle tilts and swings relative to the axis of the gun body.

[0017] In this solution, fixed welding is changed to stirring welding. While the tungsten needle in the welding torch rotates, the tip inserted into the weld pool swings, realizing welding and stirring simultaneously in the weld pool. When the tungsten needle swings, its tip can point to the two opposite side walls of the weld respectively, breaking the surface tension of the weld pool and making the liquid solder extend to the side walls of the weld, expanding the welding area of a single welding. Rotating the tungsten needle expands the coverage range of the arc, significantly improves the welding speed, reduces the welding time, and improves the production efficiency. At the same time, the rotating arc distributes heat evenly, reduces welding defects such as pores and slag inclusions, and improves the density and strength of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 shows a schematic structural diagram of a welding device provided by an embodiment of the present invention;

[0020] Figure 2 shows Figure 1 a cross-sectional view of the welding torch in

[0021] Figure 3 shows a schematic structural diagram of a weld provided by an embodiment of the present invention;

[0022] Figure 4 shows Figure 2 a schematic structural diagram of the limiting member of the welding torch in

[0023] Figure 5 shows a flowchart of a welding method provided by an embodiment of the present invention.

[0024] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0025] 300, welding torch;

[0026] 310, gun body; 321, tungsten needle;

[0027] 330. Driving component; 331. First connecting piece;

[0028] 340. Limiting component; 3411. Through hole; 3412. First wall surface; 3413. Second wall surface;

[0029] 350. Front gun; 360. Rear gun;

[0030] 400. Wire feeding gun;

[0031] 700. Weld seam; 710. Arc-shaped wall; 720. Flat wall. Specific implementation mode

[0032] Next, the technical solutions in at least one embodiment will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one embodiment is only illustrative and does not constitute a limitation on the present application and its application. Based on the embodiments in the present application, other embodiments obtained by those of ordinary skill in the art without creative efforts all fall within the scope of protection of the present application.

[0033] An embodiment of the present invention provides a welding method, including: friction stir welding: rotating the tungsten needle 321 in the welding torch 300 and making the tip of the tungsten needle 321 swing; inserting the tip of the tungsten needle 321 into the molten pool of the weld seam 700 to stir the molten pool. During the process of stirring the molten pool, the tip of the tungsten needle 321 can respectively point to two opposite side walls of the weld seam 700 to reduce the surface tension of the molten pool; wherein, the rotation speed of the tungsten needle 321 is 500 - 8000 rpm / min. Further, the rotation speed of the tungsten needle 321 is 1000 - 5500 rpm / min.

[0034] In this solution, fixed welding is changed to friction stir welding. While the tungsten needle 321 in the welding torch rotates, the tip inserted into the molten pool of the weld seam 700 swings, realizing welding and stirring simultaneously in the molten pool. When the tungsten needle 321 swings, its tip can respectively point to two opposite side walls of the weld seam 700, breaking the surface tension of the molten pool, making the liquid solder extend to the side walls of the weld seam 700, expanding the welding area of a single welding. Rotating the tungsten needle 321 expands the coverage range of the arc, significantly improves the welding speed, reduces the welding time, and improves the production efficiency; at the same time, the rotating arc distributes heat evenly, reduces welding defects such as pores and slag inclusions, and improves the density and strength of the weld seam.

[0035] Such as Figure 3As shown, the side walls of the weld 700 include an arc wall 710 and a flat wall 720. The two arc walls 710 of the two opposite side walls of the weld 700 are arranged opposite to each other, and the two flat walls 720 of the two opposite side walls of the weld 700 are arranged opposite to each other. Among them, the included angle between the two flat walls 720 is less than 20 degrees. The two oppositely arranged arc walls 710 can prevent solder leakage at the weld; by adjusting the angle and position of the welding torch 300, the tungsten needle 321 can better adapt to the geometric characteristics of the weld 700, realizing more precise welding. The included angle between the two flat walls 720 is less than 20 degrees. Compared with the conventional large-angle groove weld, the size of the weld 700 is reduced, so that solder filling can be reduced and welding efficiency can be improved.

[0036] Specifically, when the included angle between the two flat walls 720 is 0 degrees, the two flat walls 720 are parallel to each other, and the distance between the two flat walls 720 is 12 to 15 mm. When the weld width exceeds the set range, it will lead to increased welding difficulty, low welding efficiency, and poor weld strength at the weld; at the same time, by limiting the distance between the flat walls 720, the number of adjustments of welding parameters can be reduced, and welding efficiency can be improved.

[0037] In some embodiments, during the welding process, 100% inert gas is used as the shielding gas, and at least two are simultaneously delivered to the weld 700. Using 100% inert gas to isolate oxygen and nitrogen in the air can prevent the weld from oxidizing or nitriding at high temperatures, and the simultaneous delivery of at least two can improve the welding speed and filling efficiency.

[0038] In this embodiment, before the welding wire is delivered to the weld 700, the welding wire is heated, or the welding wire is heated and vibrated. Preheating the welding wire in advance can shorten the welding time and improve the welding efficiency. Further, vibrating the welding wire can stir the molten pool through the vibration of the welding wire, further reducing welding defects such as pores and slag inclusions, and improving the density and strength of the weld.

[0039] During the welding process, a single welding torch 300 can be used for welding. Or as Figure 1 shown, multiple welding torches 300 are used to weld a single weld 700. When welding a single weld 700, either a single welding torch 300 can be used for welding, or multiple welding torches 300 can be used, which improves the flexibility of welding operations. The welding torch 300 can be selected according to different workpiece conditions. When multiple welding torches 300 are used for welding, the welding time can be greatly shortened and the welding efficiency can be improved.

[0040] In this embodiment, a plurality of welding torches 300 are used to weld a weld seam 700. The plurality of welding torches 300 include a front torch 350 and at least one rear torch 360. Among them, the type of the front torch 350 can be replaced with a deep penetration argon arc welding torch or a high-speed rotating argon arc welding torch, and the type of the rear torch 360 is a high-speed rotating argon arc welding torch. The deep penetration argon arc welding torch is used for backing welding of the weld seam 700, and the high-speed rotating argon arc welding torch is used for filling and capping welding of the weld seam 700. The tungsten electrode 321 of the high-speed rotating argon arc welding torch can rotate and swing to stir the molten pool. Dividing the welding torch 300 into a front torch 350 and a rear torch 360 and reasonably dividing the welding operation can improve the welding efficiency and quality. The type of the welding torch 300 can be replaced according to different welding steps for the front torch 350. When backing welding of the weld seam 700 is required, the front torch 350 is replaced with a deep penetration argon arc welding torch. When filling and capping welding of the weld seam 700 is required, the front torch 350 is replaced with a high-speed rotating argon arc welding torch, and the operation is more flexible, which can meet the welding requirements at different times.

[0041] As Figure 5 shown, the welding method further includes a backing step, and the backing step includes: determining the distance between the front torch 350 and the rear torch 360. The front torch 350 uses a deep penetration argon arc welding torch, and the front torch 350 and the rear torch 360 move synchronously along the extension direction of the weld seam 700. The front torch 350 starts arc, and a welding wire is fed to the tip region of the front torch 350 to perform full penetration backing welding. The rear torch 360 moves to the position welded by the front torch 350 to start arc by the contact method. At this time, a molten pool is formed, and a welding wire is fed to the tip region of the rear torch 360. Among them, the high-speed rotating argon arc welding torch operates using stirring welding. Through the synergistic effect of the front torch 350 and the rear torch 360, full penetration of the weld seam 700 and subsequent finishing are achieved. The deep penetration argon arc welding torch is responsible for backing to form a stable molten pool, while the high-speed rotating argon arc welding torch improves the density and strength of the weld seam through stirring welding.

[0042] In this embodiment, during the movement of the rear torch 360, the whole rear torch 360 swings along the width direction of the weld seam 700. After the front torch 350 welds the weld seam 700 once, it stops arc, and after the rear torch 360 welds the weld seam 700 once, it stops arc. The whole rear torch 360 swings along the width direction of the weld seam 700. With such a setting, the molten pool can completely cover the weld seam 700, avoiding voids in the width direction of the weld seam 700 and affecting the welding strength.

[0043] As Figure 5As shown, after the backing step is completed, the welding method further includes a filling / capping step, and the filling / capping step includes: determining the distance between the front gun 350 and the rear gun 360, replacing the front gun 350 with a high-speed rotating GTAW gun, and synchronously moving the front gun 350 and the rear gun 360 along the extension direction of the weld seam 700; starting the arc of the front gun 350, feeding the welding wire to the tip area of the front gun 350, and during the movement of the front gun 350, the whole front gun 350 swings along the width direction of the weld seam 700, so as to adapt to the weld seam with a larger width; the rear gun 360 moves to the position welded by the front gun 350 to start the arc by the contact method, feeds the welding wire to the tip area of the rear gun 360, and during the movement of the rear gun 360, the whole rear gun 360 swings along the width direction of the weld seam 700; wherein, the high-speed rotating GTAW gun operates using friction stir welding. Through the coordinated action of the front gun 350 and the rear gun 360 again, the filling and capping welding of the weld seam is realized. The high-speed rotating GTAW gun can not only expand the welding area and improve the welding speed, but also improve the density and strength of the weld seam through friction stir welding.

[0044] As Figures 1 to 4 shown, the present invention also provides a welding device. The welding device adopts the above welding method. The welding device includes a welding gun 300 and a wire feeding gun 400. The welding gun 300 includes a gun body 310, a tungsten electrode 321, a driving assembly 330 and a limiting component 340. The tungsten electrode 321, the driving assembly 330 and the limiting component 340 are all installed on the gun body 310. The driving assembly 330 is movably connected to the tungsten electrode 321. The driving assembly 330 drives the tungsten electrode 321 to revolve, and the limiting component 340 limits the tungsten electrode 321, so that during the revolution of the tungsten electrode 321, the tip of the tungsten electrode 321 swings. The driving assembly 330 and the limiting component 340 are arranged to act on the tungsten electrode 321 together, so that the tip of the tungsten electrode 321 swings during the revolution. With such an arrangement, the tungsten electrode 321 in the welding gun 300 can swing during welding, breaking the surface tension of the molten solder at the weld seam 700, expanding the welding area of a single welding, so that the number of weldings on the weld seam 700 can be reduced, and the welding efficiency is improved; at the same time, the rotating arc distributes heat evenly, reducing welding defects such as pores and slag inclusions, and improving the density and strength of the weld seam 700.

[0045] In this embodiment, as Figure 2 、 Figure 4As shown in the figure, the driving component 330 includes a first connecting member 331 which is rotatably arranged. The first connecting member 331 is movably connected to one end of the tungsten needle 321 away from the tip, so as to drive the tungsten needle 321 to revolve. The limiting member 340 is arranged at an interval from the driving component 330 along the axis direction of the gun body 310. The limiting member 340 has a through hole 3411 through which the tungsten needle 321 passes. The hole wall surface of the through hole 3411 limits the tungsten needle 321. The hole wall surface of the through hole 3411 includes a first wall surface 3412 and a second wall surface 3413 which are connected to each other. The first wall surface 3412 is a first arc surface, and the second wall surface 3413 is a plane. When the tungsten needle 321 is in contact with the plane, the tungsten needle 321 tilts and swings relative to the axis of the gun body 310. With such a setting, through the cooperative design of the first connecting member 331 and the limiting member 340, the rotation trajectory of the tungsten needle 321 is changed, enabling it to effectively stir the molten pool during the welding process. This stirring destroys the surface tension of the molten pool, promotes the uniform flow of the liquid metal in all directions, significantly increases the width of the weld 700, and forms a more plump and flat welding area. Moreover, the increased weld area promotes the refinement and uniform distribution of metal grains, significantly improves the physical properties of the welding area, such as strength, toughness, and fatigue resistance, thereby optimizing the overall quality and reliability of the welded part.

[0046] In this solution, the high-speed rotating tungsten needle argon arc welding process significantly improves the welding efficiency and quality. Utilizing the interlayer temperature of the front gun 350 provides favorable conditions for the rear gun 360, improving the cladding efficiency and welding speed. By rotating the tungsten needle 321, the arc distribution becomes more uniform, enhancing the fusion property and increasing the surface area of the molten pool, thus improving the welding efficiency. The swing of the rotating tungsten needle 321 can achieve large fillet welds and large welds, creating more conditions for fillet welds and transverse welds. Through the optimization of the welding torch 300 and the wire feeding structure, as well as the addition of inert gas for protection, the welding quality and welding efficiency are improved, and the welding cost is reduced at the same time.

[0047] The above are only some embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0049] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, top, bottom, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0051] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "above-mentioned", etc. may be used here to describe the spatial positional relationships of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0052] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, these words have no special meanings, and thus cannot be construed as limiting the protection scope of the present application.

Claims

1. A welding method, characterized in that, Including: Friction stir welding: Rotate the tungsten needle (321) in the rotating welding torch (300) and swing the tip of the tungsten needle (321); Insert the tip of the tungsten needle (321) into the molten pool of the weld seam (700) to stir the molten pool. During the process of stirring the molten pool, the tip of the tungsten needle (321) can respectively point to two opposite side walls of the weld seam (700) to reduce the surface tension of the molten pool; wherein, the rotation speed of the tungsten needle (321) is 500 - 8000 rpm / min.

2. The welding method according to claim 1, characterized in that, The side walls of the weld seam (700) include arc-shaped walls (710) and planar walls (720). The two arc-shaped walls (710) of the two opposite side walls of the weld seam (700) are arranged oppositely, and the two planar walls (720) of the two opposite side walls of the weld seam (700) are arranged oppositely. Among them, the included angle between the two planar walls (720) is less than 20 degrees.

3. The welding method according to claim 2, characterized in that, The two planar walls (720) are parallel to each other, and the distance between the two planar walls (720) is 12 to 15 mm.

4. The welding method according to claim 1, wherein During the welding process, 100% inert gas is used as the shielding gas, and at least two are simultaneously supplied to the weld seam (700).

5. The welding method according to claim 1, wherein Before the welding wire is supplied to the weld seam (700), the welding wire is heated, or the welding wire is heated and vibrated.

6. The welding method according to claim 1, wherein During the welding process, a single welding torch (300) is used for welding, or multiple welding torches (300) are used to weld one weld seam (700).

7. The welding method according to claim 1, wherein When multiple welding torches (300) are used to weld one weld seam (700), the multiple welding torches (300) include a front torch (350) and at least one rear torch (360); wherein, the type of the front torch (350) can be replaced with a deep penetration argon arc welding torch or a high-speed rotating argon arc welding torch, the type of the rear torch (360) is a high-speed rotating argon arc welding torch, the deep penetration argon arc welding torch is used for root welding of the weld seam (700), the high-speed rotating argon arc welding torch is used for filling and capping welding of the weld seam (700), and the tungsten needle (321) of the high-speed rotating argon arc welding torch can rotate and swing to stir the molten pool.

8. The welding method according to claim 7, characterized in that, The welding method further includes a root welding step, and the root welding step includes: Determine the distance between the front torch (350) and the rear torch (360). The front torch (350) uses the deep penetration argon arc welding torch, and the front torch (350) and the rear torch (360) move synchronously along the extending direction of the weld seam (700); The front torch (350) starts arc, and supplies the welding wire to the tip area of the front torch (350) to perform full penetration root welding; The rear torch (360) moves to the position welded by the front torch (350) to start arc by the contact method. At this time, the molten pool is formed, and the welding wire is supplied to the tip area of the rear torch (360); Among them, the high-speed rotating argon arc welding torch operates using the friction stir welding.

9. The welding method according to claim 8, wherein During the movement of the rear torch (360), the whole rear torch (360) swings along the width direction of the weld seam (700); The front welding torch (350) stops arc after welding the weld seam (700) once, and the rear welding torch (360) stops arc after welding the weld seam (700) once.

10. The welding method according to claim 8, characterized in that, After the backing step is completed, the welding method further includes a filling / capping step, and the filling / capping step includes: Determining the distance between the front welding torch (350) and the rear welding torch (360), replacing the front welding torch (350) with the high-speed rotating GTAW torch, and synchronously moving the front welding torch (350) and the rear welding torch (360) along the extension direction of the weld seam (700); The front welding torch (350) starts arc, feeds a welding wire to the tip region of the front welding torch (350), and during the movement of the front welding torch (350), the whole front welding torch (350) swings along the width direction of the weld seam (700); The rear welding torch (360) moves to the position welded by the front welding torch (350) to start arc by the contact method, feeds a welding wire to the tip region of the rear welding torch (360), and during the movement of the rear welding torch (360), the whole rear welding torch (360) swings along the width direction of the weld seam (700); Wherein, the high-speed rotating GTAW torch operates using friction stir welding.

11. A welding device, characterized in that, The welding equipment adopts the welding method according to any one of claims 1 to 10. The welding equipment includes a welding torch (300) and a wire feeding torch (400). The welding torch (300) includes a torch body (310), a tungsten electrode (321), a driving assembly (330) and a limiting member (340). The tungsten electrode (321), the driving assembly (330) and the limiting member (340) are all installed on the torch body (310). The driving assembly (330) is movably connected to the tungsten electrode (321), and the driving assembly (330) drives the tungsten electrode (321) to revolve. The limiting member (340) limits the tungsten electrode (321) so that the tip of the tungsten electrode (321) swings during the revolution of the tungsten electrode (321).

12. The welding equipment according to claim 11, wherein The driving assembly (330) includes a first connecting member (331). The first connecting member (331) is rotatably arranged and is movably connected to the end of the tungsten electrode (321) away from the tip to drive the tungsten electrode (321) to revolve; The limiting member (340) and the driving assembly (330) are arranged at intervals along the axial direction of the gun body (310). The limiting member (340) has a through hole (3411), and the tungsten needle (321) passes through the through hole (3411). The hole wall surface of the through hole (3411) limits the tungsten needle (321). The hole wall surface of the through hole (3411) includes a first wall surface (3412) and a second wall surface (3413) that are connected to each other. The first wall surface (3412) is a first arc surface, and the second wall surface (3413) is a plane. When the tungsten needle (321) is in contact with the plane, the tungsten needle (321) tilts and swings relative to the axis of the gun body (310).

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