TIG wire feeding welding gun

Abstract

The invention discloses a TIG (Tungsten Inert Gas) wire feeding welding gun, which belongs to the technical field of welding, and comprises a wire feeding pipe, a welding gun body, a welding gun head and a locking mechanism, the wire feeding pipe comprises a first wire feeding pipe and a second wire feeding pipe which are movably inserted; the welding gun body is connected with the second wire feeding pipe; the welding gun head is connected with the welding gun body; the locking mechanism comprises a mounting body and a locking structure, the mounting body is arranged on the welding gun head, the mounting body is provided with a mounting groove used for arranging the first wire feeding pipe, and the locking structure is used for locking the first wire feeding pipe in the mounting groove; an outlet of the first wire feeding pipe is close to the tip end of a tungsten electrode of the welding gun head. The wire feeding pipe is divided into the first wire feeding pipe and the second wire feeding pipe, position adjustment of a welding wire and a tungsten electrode is achieved by adjusting and locking the first wire feeding pipe, adjustment of the whole wire feeding pipe is avoided, and accurate control and rapid adjustment of the wire feeding position can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and particularly to a TIG wire feeding welding torch. Background Art

[0002] In the field of welding technology, especially for some nuclear power small reactors with specific designs, the connection between the inlet and outlet water pipes of the pressure vessel and those of the main heat exchanger faces unique engineering challenges. Due to the strict restrictions on external space conditions, traditional welding methods cannot meet the installation requirements. Therefore, the form of full-position butt welding inside the hole must be adopted to complete the connection of these key components. This welding method not only requires extremely high technical precision but also must be implemented in an extremely limited working space, thus greatly increasing the construction difficulty.

[0003] The joint quality is crucial for the safe operation of nuclear power small reactors, and any minor defect may lead to serious consequences. Therefore, when selecting a welding process, its reliability and stability must be given priority. The TIG (Tungsten Inert Gas Welding) process has become a widely used welding method in this field due to its good welding quality and high flexibility. For general thin-walled tubes, the autogenous welding without wire feeding process can effectively achieve welding and simplify the operation process. However, when the wall thickness reaches 4 mm or more, it is difficult to ensure the weld penetration solely by the autogenous welding without wire feeding process, which will affect the strength and sealing performance of the joint. To solve this problem, the pre-groove wire feeding welding technology is generally adopted in practice. Through the pre-opened groove and precise wire feeding control, it is ensured that the weld can completely penetrate the tube wall to achieve the required welding quality.

[0004] However, when implementing TIG welding in an internal hole environment, especially when involving wire feeding operations, a series of technical problems are faced. The existing wire feeding component designs often make it difficult to accurately determine the wire feeding position, or the adjustment process is cumbersome and complex. This not only affects the welding efficiency, but more importantly, it is difficult to ensure precise welding in the narrow and difficult-to-observe tube internal environment. Even a slight deviation in the wire feeding position may result in unqualified weld quality, which will affect the safety and reliability of the entire nuclear power small reactor system.

[0005] In summary, in the current full-position butt welding technology for the internal holes of the inlet and outlet water pipes of the pressure vessel and the main heat exchanger in nuclear power small reactors, the design and use of the wire feeding component have become the key factors restricting the welding quality and efficiency. Therefore, there is an urgent need for an innovative wire feeding component design that can overcome the limitations of the existing technology and achieve precise control and rapid adjustment of the wire feeding position to meet the high-standard welding requirements of nuclear power small reactors. Summary of the Invention

[0006] The object of the present invention is to provide a TIG wire feeding torch to solve the problems existing in the above-mentioned prior art. The wire feeding tube is divided into a first wire feeding tube and a second wire feeding tube. By adjusting and locking the first wire feeding tube, the position adjustment of the welding wire and the tungsten electrode is realized, avoiding the adjustment of the entire wire feeding tube, and ensuring the precise control and rapid adjustment of the wire feeding position.

[0007] To achieve the above object, the present invention provides the following solution:

[0008] The present invention provides a TIG wire feeding torch, including a wire feeding tube, a welding gun body, a welding gun head and a locking mechanism: the wire feeding tube includes a first wire feeding tube and a second wire feeding tube which are movably inserted; the welding gun body is connected to the second wire feeding tube; the welding gun head is connected to the welding gun body; the locking mechanism includes a mounting body and a locking structure. The mounting body is arranged on the welding gun head. The mounting body has a mounting groove for arranging the first wire feeding tube. The locking structure is used to lock the first wire feeding tube in the mounting groove. The outlet of the first wire feeding tube is close to the tip of the tungsten electrode of the welding gun head.

[0009] In an embodiment, the first wire feeding tube includes an arc tube section and a first straight tube section which are connected to each other. The second wire feeding tube includes a second straight tube section. The axis of the first straight tube section coincides with the axis of the second straight tube section. The outer diameter of the first straight tube section is smaller than the inner diameter of the second straight tube section.

[0010] In an embodiment, the mounting groove is a through hole. The first straight tube section penetrates through the through hole. The mounting body is also provided with a threaded hole radially communicating with the through hole. The locking structure uses a locking screw, and the locking screw is threadedly connected to the threaded hole.

[0011] In an embodiment, the mounting body installs the welding gun head through an insulating plate. Heat shrinkable tubes are wrapped on the outer diameter sides of the first wire feeding tube and the second wire feeding tube.

[0012] In an embodiment, the welding gun head includes a tungsten electrode clamp, a gas lens and a set screw. The tungsten electrode clamp has a split structure for wrapping the tungsten electrode. The top end of the split structure abuts against the conical surface of the gas lens. The set screw is threadedly connected to the welding gun head. By tightening the set screw, the tungsten electrode clamp is tightened, and the split structure radially contracts to clamp the tungsten electrode.

[0013] In an embodiment, the welding gun head includes a water-cooled torch and a ceramic nozzle. The ceramic nozzle is threadedly connected to the outer diameter side of the gas lens. A polytetrafluoroethylene gasket is arranged between the gas lens and the water-cooled torch. An insulating sleeve is wrapped on the outer side of the water-cooled torch.

[0014] In one embodiment, the welding gun body includes a metal tube and an insulating ring connected to the end of the metal tube, and a support hole is provided on the insulating ring.

[0015] In one embodiment, it further includes a water inlet pipe and a water outlet pipe. The support hole includes a water pipe support hole. The water inlet pipe and the water outlet pipe are located inside the metal tube, pass through the water pipe support hole and then extend to the welding gun head. Both the water inlet pipe and the water outlet pipe are connected to the water-cooled torch, and heat shrink tubes are wrapped around the outer diameter sides of the water inlet pipe and the water outlet pipe.

[0016] In one embodiment, it further includes a protective gas pipe. The support hole includes a gas pipe support hole. The protective gas pipe is located inside the metal tube, passes through the gas pipe support hole and then extends to the welding gun head. The protective gas pipe is connected to the water-cooled torch, and a heat shrink tube is wrapped around the outer diameter side of the protective gas pipe.

[0017] In one embodiment, it further includes an endoscope tube. The support hole includes an endoscope tube support hole. The endoscope tube is located inside the metal tube and extends toward the welding gun head after passing through the endoscope tube support hole.

[0018] The present invention has achieved the following technical effects compared with the prior art:

[0019] The present invention divides the wire feeding tube into a first wire feeding tube and a second wire feeding tube that can be movably inserted into each other. The welding gun body is used to connect the second wire feeding tube, and the welding gun head is used to connect the first wire feeding tube. Through the setting of the locking mechanism, it is possible to adjust the position of the welding wire and the tungsten electrode and lock the adjusted first wire feeding tube only by adjusting the first wire feeding tube, thereby avoiding adjusting the entire wire feeding tube and achieving precise control and rapid adjustment of the wire feeding position. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the overall structure of the TIG wire feeding welding gun in the embodiment of the present invention;

[0022] Figure 2 For Figure 1 Partial cross-sectional view;

[0023] Figure 3 For Figure 1 Enlarged schematic diagram of the welding gun head part in;

[0024] Figure 4 For Figure 2 The perspective view after A-A sectioning in the middle;

[0025] Figure 5 The schematic diagram of the tungsten electrode holder in the embodiment of the present invention;

[0026] Wherein, 1, setscrew; 2, insulating sleeve; 3, water-cooled welding torch; 4, polytetrafluoroethylene gasket; 5, gas lens; 6, tungsten electrode holder; 7, tungsten electrode; 8, ceramic nozzle; 9, water inlet pipe; 10, shielding gas pipe; 11, endoscope tube; 12, second wire feeding tube; 13, first wire feeding tube; 14, mounting body; 15, insulating plate; 16, insulating ring; 17, metal tube; 18, locking structure; 19, water outlet pipe; 100, welding gun head; 200, welding gun body; 300, wire feeding tube; 400, locking mechanism. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0028] The purpose of the present invention is to provide a TIG wire feeding welding gun to solve the problems existing in the prior art. The wire feeding tube is divided into a first wire feeding tube and a second wire feeding tube. The position adjustment of the welding wire and the tungsten electrode is realized by adjusting and locking the first wire feeding tube, avoiding the adjustment of the whole wire feeding tube, and ensuring the precise control and rapid adjustment of the wire feeding position.

[0029] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Such as Figures 1 to 5As shown in the figure, the present invention provides a TIG wire feeding welding torch, which can perform welding operations in a narrow space, especially inside pipe fittings with a small diameter. Due to the narrow space, there is no installation space for a molten pool observation system, and blind welding has to be adopted. Once a defect appears in the weld, it is difficult to repair afterwards. Therefore, a welding torch with complete functions and convenient and reasonable mechanical adjustment is very important for the internal hole welding of small nuclear power reactors. The TIG wire feeding welding torch of the present invention includes a wire feeding tube 300, a welding gun body 200, a welding gun head 100, and a locking mechanism 400. The wire feeding tube 300 is used to convey the welding wire to the welding gun head 100, and the welding wire is conveyed to the accurate position through the guiding action of the wire feeding tube 300. The wire feeding tube 300 includes a first wire feeding tube 13 and a second wire feeding tube 12. The first wire feeding tube 13 and the second wire feeding tube 12 are inserted into each other, but are not fixed by the insertion connection method. The first wire feeding tube 13 can rotate and axially move relative to the second wire feeding tube 12. The welding gun body 200 is connected to the second wire feeding tube 12, and the second wire feeding tube 12 can be fixed by using the welding gun body 200. In order to perform welding inside the pipe fitting, the length of the welding gun body 200 can be made relatively long. At this time, the second wire feeding tube 12 is also relatively long. By fixing the second wire feeding tube 12 to the welding gun body 200 and the first wire feeding tube 13 being relatively movable, it can effectively avoid the inconvenience caused by the need for overall adjustment when adjusting the position of the wire feeding tube 300. The welding gun head 100 is connected to the welding gun body 200. On the one hand, the welding gun body 200 is used to support the welding gun head 100, so that the welding gun head 100 can perform welding operations at the designated position. On the other hand, the welding gun body 200 is used to convey shielding gas, cooling water, electric energy, etc. to the welding gun head 100. The locking mechanism 400 includes a mounting body 14 and a locking structure 18. The mounting body 14 is arranged on the welding gun head 100. The mounting body 14 has a mounting groove, and the mounting groove can be an open U-shaped groove or a through hole. The first wire feeding tube 13 can be arranged in the mounting groove. Before being locked, the first wire feeding tube 13 can move or rotate relative to the mounting body 14 to adjust the position of the first wire feeding tube 13. After being locked, the first wire feeding tube 13 is relatively fixed to the mounting body 14. The locking structure 18 can adopt screws or bolts. The first wire feeding tube 13 is locked in the mounting groove through the locking structure 18 to lock it after the position of the first wire feeding tube 13 is adjusted. The outlet of the first wire feeding tube 13 is close to the tip of the tungsten electrode 7 of the welding gun head 100, and provides the welding wire during the welding process.

[0031] In the present invention, the wire feeding tube 300 is divided into a first wire feeding tube 13 and a second wire feeding tube 12 that can be movably inserted into each other. The second wire feeding tube 12 is connected by the welding gun body 200, and the first wire feeding tube 13 is connected by the welding gun head 100. Through the setting of the locking mechanism 400, it is possible to adjust the position of the welding wire and the tungsten electrode 7 and lock the adjusted first wire feeding tube 13 only by adjusting the first wire feeding tube 13. Thus, it is possible to avoid adjusting the entire wire feeding tube 300, achieve precise control and rapid adjustment of the wire feeding position, and realize wire feeding at the front end of the groove in a narrow space.

[0032] In an embodiment, the first wire feeding tube 13 includes an arc tube section and a first straight tube section that are connected to each other. The second wire feeding tube 12 includes a second straight tube section. The axis of the first straight tube section coincides with the axis of the second straight tube section. The outer diameter of the first straight tube section is smaller than the inner diameter of the second straight tube section. The first straight tube section can be inserted into the second straight tube section to achieve the insertion connection between the first wire feeding tube 13 and the second wire feeding tube 12. The arc tube section can guide the welding wire to the tip position of the tungsten electrode 7.

[0033] In an embodiment, the installation groove for setting the first wire feeding tube 13 uses a through hole, and the axis of the through hole coincides with the axial direction of the second straight tube section. When installing the first wire feeding tube 13, the first straight tube section passes through the through hole and is connected to the second straight tube section. The installation body 14 is also provided with a threaded hole that radially communicates with the through hole. The locking structure 18 uses a locking screw. The locking screw is threadedly connected to the threaded hole. When the locking screw is tightened towards the inner diameter side of the through hole, the locking screw can be pressed against the first straight tube section, thereby realizing the locking of the first wire feeding tube 13; when the locking screw is loosened towards the outer diameter side of the through hole, the pressing against the first straight tube section can be released, thereby realizing the unlocking of the first wire feeding tube 13.

[0034] In an embodiment, the installation body 14 installs the welding gun head 100 through the insulating plate 15 to fix the installation body 14, and thus fix the first wire feeding tube 13, which not only ensures the stability of wire feeding but also plays an insulating role to avoid the welding wire from conducting electricity. The outer diameter sides of the first wire feeding tube 13 and the second wire feeding tube 12 are wrapped with heat shrinkable tubes, which play an insulating role to avoid short circuits.

[0035] In an embodiment, the first wire feeding tube 13 is made of a stainless steel tube, and the second wire feeding tube 12 is made of a copper tube. The stainless steel tube can be a stainless steel tube with a diameter of 4 mm and a wall thickness of 0.5 mm, which can better adapt to the change of the arc, and can be bent into an arc tube section with an appropriate curvature at the end, thereby ensuring that the welding wire is conveyed along an arc path to meet stable wire feeding and preventing the welding wire from becoming spiral due to too small a curvature radius.

[0036] In one embodiment, the welding torch tip 100 includes a tungsten electrode clamp 6, a gas lens 5, and a setscrew 1. The tungsten electrode clamp 6 has a split structure for wrapping the tungsten electrode 7. The split structure has at least two split parts. The split parts of two or more than two split parts enclose the tungsten electrode 7. The top end of the split structure abuts against the conical surface of the gas lens 5. The setscrew 1 is threadedly connected to the welding torch tip 100. When the setscrew 1 is tightened in the direction of the tungsten electrode 7, due to the blockage of the conical surface, the split structure contracts towards the inner diameter side to clamp the tungsten electrode 7. When the setscrew 1 is loosened in the direction away from the tungsten electrode 7, the split structure expands towards the outer diameter side to loosen the tungsten electrode 7. By rotating the setscrew 1, the disassembly and installation of the tungsten electrode 7 can be easily achieved, greatly improving the convenience of replacing the tungsten electrode 7. In addition, the tungsten electrode 7 can be pulled out or installed in the direction of the setscrew 1, that is, in the direction away from the tip of the tungsten electrode 7, which can avoid the interference effect with the first wire feeding tube 13 when installing or disassembling the tungsten electrode 7.

[0037] In one embodiment, the welding torch tip 100 includes a water-cooled torch 3 and a ceramic nozzle 8. The ceramic nozzle 8 is threadedly connected to the outer diameter side of the gas lens 5. A polytetrafluoroethylene gasket 4 is provided between the gas lens 5 and the water-cooled torch 3. The polytetrafluoroethylene gasket 4 functions as a seal and an insulator. The water-cooled torch 3 adopted in this embodiment can achieve a 100% duty cycle when the welding current is less than or equal to 300 A. The outside of the water-cooled torch 3 is wrapped with an insulating sleeve 2. For example, the insulating sleeve 2 can be made of a high-temperature resistant insulating material with a thickness of about 1.5 mm. The application of the insulating sleeve 2 can prevent the welding torch tip 100 from short-circuiting with the inner wall of the pipe fitting in a narrow space (inside the pipe fitting to be welded). The structural arrangement of the above welding torch tip 100 facilitates the replacement of the gas lens 5, the ceramic nozzle 8, and the first wire feeding tube 13, avoiding the change in the position of the wire feeding tube 300 caused by frequent disassembly and assembly, and thus avoiding the resulting weld quality problems.

[0038] In one embodiment, the welding torch body 200 includes a metal tube 17 and an insulating ring 16 connected to the end of the metal tube 17. The metal tube 17 can be made of a stainless steel tube. The insulating ring 16 is provided with support holes for supporting and fixing each pipe fitting.

[0039] In one embodiment, it further includes a water inlet pipe 9 and a water outlet pipe 19. The support holes include water pipe support holes. The water inlet pipe 9 and the water outlet pipe 19 are located inside the metal tube 17 and extend to the welding torch tip 100 after passing through the water pipe support holes. Both the water inlet pipe 9 and the water outlet pipe 19 are connected to the water-cooled torch 3 to realize the circulation cooling of the cooling water flowing into the water-cooled torch 3. The outer diameter sides of both the water inlet pipe 9 and the water outlet pipe 19 are wrapped with heat shrink tubes to function as insulators and avoid short circuits.

[0040] In one embodiment, both the water inlet pipe 9 and the water outlet pipe 19 are made of copper tubes. In addition to circulating cooling water, an energized wire can be provided inside the copper tubes, and the circulating water can be used to cool and dissipate heat from the wire.

[0041] In one embodiment, it further includes a protective trachea 10. The support hole includes a trachea support hole. The protective trachea 10 is located inside the metal tube 17 and extends to the welding torch head 100 after passing through the trachea support hole. The protective trachea 10 is connected to the water-cooled welding torch 3 to realize the introduction of the shielding gas to the welding position for TIG welding. A heat shrinkable tube is wrapped around the outer diameter side of the protective trachea 10 to play an insulating role and avoid short circuit. One or more layers of heat shrinkable tubes are wrapped around the outer diameter sides of the first wire feeding tube 13, the second wire feeding tube 12, the water inlet pipe 9, the water outlet pipe 19, and the protective trachea 10, which can avoid a certain probability of short circuit of the water inlet pipe 9 (and / or the water outlet pipe 19) and the first wire feeding tube 13 (and / or the second wire feeding tube 12) when the insulating layers of the water inlet pipe 9 (and / or the water outlet pipe 19) and the first wire feeding tube 13 (and / or the second wire feeding tube 12) are both damaged and the welding wire contacts the workpiece during arc ignition.

[0042] In one embodiment, it further includes an endoscope tube 11. The support hole includes an endoscope tube support hole. The endoscope tube 11 is located inside the metal tube 17 and extends towards the welding torch head 100 after passing through the endoscope tube support hole, realizing the introduction of the endoscope into the pipe fitting to be welded along the endoscope tube 11. By driving the welding torch head 100 to rotate with the welding torch body 200, it is possible to observe whether the positioning of the welding torch is accurate, the state of the position of the tip of the tungsten electrode 7 and the welding wire before welding, and the weld seam after welding.

[0043] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A TIG wire feeding welding torch, characterized in that, Comprising: A wire feeding tube, which includes a first wire feeding tube and a second wire feeding tube that are movably inserted; A welding gun body, which is connected to the second wire feeding tube; A welding gun tip, which is connected to the welding gun body; And a locking mechanism, which includes a mounting body and a locking structure. The mounting body is arranged on the welding gun tip. The mounting body has a mounting groove for arranging the first wire feeding tube. The locking structure is used to lock the first wire feeding tube in the mounting groove. The outlet of the first wire feeding tube is close to the tip of the tungsten electrode of the welding gun tip.

2. The TIG wire feeding torch according to claim 1, wherein: The first wire feeding tube includes an arc tube section and a first straight tube section that are connected to each other. The second wire feeding tube includes a second straight tube section. The axis of the first straight tube section coincides with the axis of the second straight tube section. The outer diameter of the first straight tube section is smaller than the inner diameter of the second straight tube section.

3. The TIG wire feeding torch according to claim 2, wherein: The mounting groove is a through hole. The first straight tube section penetrates through the through hole. The mounting body is also provided with a threaded hole that communicates with the through hole radially. The locking structure uses a locking screw, and the locking screw is threadedly connected to the threaded hole.

4. The TIG wire feeding torch according to claim 1, characterized in that: The mounting body mounts the welding gun tip through an insulating plate. The outer diameter sides of the first wire feeding tube and the second wire feeding tube are wrapped with heat shrinkable tubes.

5. The TIG wire feeding torch according to any one of claims 1-4, characterized in that: The welding gun tip includes a tungsten electrode clamp, a gas lens, and a setscrew. The tungsten electrode clamp has a split structure for wrapping the tungsten electrode. The top end of the split structure abuts against the conical surface of the gas lens. The setscrew is threadedly connected to the welding gun tip. By tightening the setscrew, the tungsten electrode clamp is tightened, and the split structure radially contracts to clamp the tungsten electrode.

6. The TIG wire feeding torch according to claim 5, wherein: The welding gun tip includes a water-cooled torch and a ceramic nozzle. The ceramic nozzle is threadedly connected to the outer diameter side of the gas lens. A polytetrafluoroethylene gasket is arranged between the gas lens and the water-cooled torch. The outer side of the water-cooled torch is wrapped with an insulating sleeve.

7. The TIG wire feeding torch according to claim 6, wherein: The welding gun body includes a metal tube and an insulating ring connected to the end of the metal tube. A support hole is arranged on the insulating ring.

8. The TIG wire feeding torch according to claim 7, characterized in that: It further includes a water inlet pipe and a water outlet pipe. The support hole includes a water pipe support hole. The water inlet pipe and the water outlet pipe are located inside the metal tube and extend to the welding gun tip after passing through the water pipe support hole. The water inlet pipe and the water outlet pipe are both communicated with the water-cooled torch. The outer diameter sides of the water inlet pipe and the water outlet pipe are both wrapped with heat shrinkable tubes.

9. The TIG wire feeding welding torch according to claim 7, characterized in that: It further includes a protective gas pipe. The support hole includes a gas pipe support hole. The protective gas pipe is located inside the metal tube and extends to the welding gun tip after passing through the gas pipe support hole. The protective gas pipe is communicated with the water-cooled torch. The outer diameter side of the protective gas pipe is wrapped with a heat shrinkable tube.

10. The TIG wire feeding torch according to claim 7, wherein: It further includes an endoscope tube. The support hole includes an endoscope tube support hole. The endoscope tube is located inside the metal tube and extends towards the welding gun tip after passing through the endoscope tube support hole.

Images