K-tig welding tail protector

Abstract

The utility model relates to a kind of K-TIG welding tail protection device, including, protective cover body, protective cavity is provided in the protective cover body, damping nozzle is provided on protective cover body, cooling circulation coil pipe is provided on the outer side of protective cover body, multiple layers of dense hole copper screen and aperture plate are provided in the protective cavity;Through the gas diffusion passage of damping plug, multiple layers of dense hole copper screen, aperture plate, realize secondary current uniformity effect, make effluent gas more soft, uniform, form laminar gas curtain, effectively avoid that turbulent flow will air be rolled into protection area, ensure the reliability of protection effect.

Description

Technical Field

[0001] This utility model belongs to the field of welding technology, specifically a K-TIG welding tail protection device. Background Technology

[0002] K-TIG deep penetration welding is a highly efficient, high-current welding process that uses a high-energy-density arc to penetrate the workpiece in one pass, creating a keyhole effect and achieving single-sided welding with double-sided forming. However, this process requires extremely high current, reaching 500-600 amperes when welding medium-thick plates of 8-14mm. During the welding process, as the welding torch moves forward, the weld joint formed by the subsequent solidification of the molten pool gradually leaves the inert gas protection zone of the welding torch, and the temperature of the subsequent weld area is extremely high, with a long high-temperature residence time. The area outside the inert gas protection remains at a high temperature, leading to oxidation problems.

[0003] Existing general-purpose welding shields are typically single-chamber structures with limited airflow coverage and protection time, generally suitable for welding methods with low current, low heat input, and low temperatures. However, in K-TIG welding, due to this high-current welding process, although the weld tail is no longer directly affected by the arc, its temperature remains far above the critical temperature for severe oxidation of materials such as stainless steel and nickel alloys. This is especially true for reactive metals like titanium and titanium alloys, and zirconium and zirconium alloys, where high-temperature oxidation is even more severe. The protective gas provided by conventional single-chamber shields is insufficient to completely cover this high-temperature area until it cools to a safe temperature, leading to severe oxidation of the weld tail and heat-affected zone, forming a thick oxide scale. This not only affects the product's appearance quality but also damages the corrosion resistance of materials such as stainless steel, nickel alloys, titanium and titanium alloys, and zirconium and zirconium alloys. Subsequent grinding, pickling, and even scrapping require significant manpower and resources, increasing production costs and reducing production efficiency.

[0004] Therefore, there is an urgent need for a special device that can effectively extend the protection time of the high-temperature zone at the tail of K-TIG welds and prevent its high-temperature oxidation. Utility Model Content

[0005] To address the shortcomings of existing technologies where the tail of K-TIG deep penetration welds suffers from severe oxidation due to high temperature, slow cooling, and insufficient protection from existing protective covers, a dedicated tail protective cover with a reasonable structure that can effectively extend the protection time and significantly reduce oxidation is provided.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a K-TIG welding tail protection device, comprising,

[0007] The protective cover has a protective cavity inside, a damping nozzle on the protective cover, a cooling circulation coil on the outside of the protective cover, and a multi-layer dense copper mesh and perforated plate inside the protective cavity.

[0008] As a preferred technical solution for a K-TIG welding tail protection device, the damping nozzle includes a limiting plate and a threaded tube disposed below the limiting plate, and an air inlet pipe is disposed above the limiting plate.

[0009] As a preferred technical solution for a K-TIG welding tail protection device, the protective cover is provided with a threaded hole, and the threaded tube is connected to the threaded hole.

[0010] As a preferred technical solution for a K-TIG welding tail protection device, a damping plug is provided below the threaded tube.

[0011] As a preferred technical solution for a K-TIG welding tail protection device, an arc-shaped groove is provided at one end of the protective cover.

[0012] As a preferred technical solution for a K-TIG welding tail protection device, the cooling circulation coil includes U-shaped tubes disposed on both sides of the protective cover and a connecting pipe connecting one end of the two U-shaped tubes.

[0013] The beneficial effects of this utility model are as follows: 1. The tail extension gas chamber with independent gas supply from the dual-channel damping nozzle can provide continuous and stable gas protection for the high-temperature area at the tail that has left the main arc protection zone. The protective atmosphere is sufficient, which significantly extends the protection time of the high-temperature area and ensures that it is always in an inert gas atmosphere in the high-risk temperature range, thereby fundamentally curbing the occurrence of severe oxidation.

[0014] 2. The circulating cooling coil water cooling system on the outer wall can quickly remove a large amount of radiant heat absorbed by the protective cover body, effectively reducing the temperature of the protective cover itself. This avoids the problem of gas pre-expansion, reduced protective effect, or even damage caused by overheating of the protective cover, which helps K-TIG to be welded for a long time. At the same time, it also helps to reduce the surface temperature of the workpiece and enhances the actual effect of the protective gas.

[0015] 3. Through the gas diffusion pathways of damping plugs, multi-layer dense-hole copper mesh, and perforated plates, a secondary flow equalization effect is achieved, making the outflowing gas more gentle and uniform, forming a laminar flow air curtain, effectively preventing turbulence from entraining air into the protected area, and ensuring the reliability of the protection effect.

[0016] 4. After applying this utility model, the tail of the K-TIG weld shows a uniform silver-white or golden-yellow (dense oxide film), which eliminates or greatly reduces subsequent cleaning work, significantly improves the appearance quality and corrosion resistance of the welded joint, avoids product scrapping caused by welding oxidation defects, saves production costs, and improves production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is a schematic diagram of the overall structure of the protective device of this utility model;

[0019] Figure 2 This is a perspective structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the bottom structure of the protective device of this utility model;

[0021] Figure 4 This is a schematic diagram of the damping nozzle in this utility model;

[0022] Figure 5 This is a schematic diagram of the perforated plate of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the multi-layer dense-hole copper mesh in this utility model.

[0024] Reference numerals: 11. Protective cavity; 4. Multi-layer dense perforated copper mesh; 5. Perforated plate; 2. Damping nozzle; 21. Limiting plate; 23. Air inlet pipe; 22. Threaded pipe; 24. Damping plug; 12. Arc-shaped groove; 3. Cooling circulation coil; 1. Protective cover; 31. U-shaped pipe; 32. Connecting pipe. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0028] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0029] Example 1

[0030] Reference Figures 1-6 This embodiment provides a K-TIG welding tail protection device, including a protective cover 1, a protective cavity 11 provided in the protective cover 1, a damping nozzle 2 provided on the protective cover 1, a cooling circulation coil 3 provided on the outside of the protective cover 1, and a multi-layer dense perforated copper mesh 4 and a perforated plate 5 provided in the protective cavity 11.

[0031] The damping nozzle 2 includes a limiting plate 21 and a threaded pipe 22 disposed below the limiting plate 21, and an air inlet pipe 23 disposed above the limiting plate 21.

[0032] The limiting plate 21 is hexagonal and is used to limit the installation of the damping nozzle 2 and to facilitate the unscrewing or installation of the threaded tube from the threaded hole.

[0033] The limiting plate 21 has holes that communicate with the threaded pipe 22 and the air inlet pipe 23.

[0034] The protective cover 1 is provided with a threaded hole, and the threaded tube 22 is connected to the threaded hole.

[0035] A damping plug 24 is provided below the threaded pipe 22.

[0036] The specific structure of the damping plug is existing technology and will not be described in detail. The damping plug 24 is placed in the protective cavity 11.

[0037] One end of the protective cover 1 is provided with an arc-shaped groove 12.

[0038] The cooling circulation coil 3 includes U-shaped tubes 31 disposed on both sides of the protective cover 1 and connecting pipes 32 connecting one end of the two U-shaped tubes 31.

[0039] Specifically, the front end of the protective cover is provided with an arc-shaped groove 12 for placing the K-TIG welding torch; two evenly distributed threaded holes are provided on the top of the protective cover 1 for installing dual-path damping nozzles 2, both of which are inert gas inlets; a cooling circulation coil 3 is provided on the outer wall of the protective cover 1, with water entering at one end and exiting at the other end; a multi-layer dense copper mesh 4 is provided below the dual-path damping nozzles inside the protective cover 1; a perforated plate 5 is provided below the multi-layer dense copper mesh 4 for supporting the multi-layer dense copper mesh. During use, cooling water is introduced from one end of the cooling circulation coil 3. Under the action of the cooling circulation coil 3, the protective cover 1 quickly removes the high heat of the protective cover, enabling the protective cover to be used continuously for a long time and avoiding the problem of poor protection effect at the weld tail due to the high temperature of the protective cover. At the same time, inert gas is introduced through the dual-channel damping nozzle. The inert gas is uniformly flowed through the damping plug inside the damping nozzle. The inert gas through the damping plug forms a uniform flow air chamber between the inert gas and the multi-layer dense copper mesh. As the airflow of the nozzle increases, the inert gas in the uniform flow air chamber is uniformly flowed again through the multi-layer dense copper mesh to form a more uniform and gentle inert gas. After passing through the orifice plate, an excellent protective atmosphere is formed below the protective cover, thereby effectively extending the protection time of the high-temperature area at the tail of the K-TIG weld and preventing its high-temperature oxidation.

[0040] The beneficial effects of this application are as follows: 1. The tail extension gas chamber with independent gas supply from the dual-channel damping nozzle can provide continuous and stable gas protection for the high-temperature area at the tail that has left the main arc protection zone. The protective atmosphere is sufficient, which significantly extends the protection time of the high-temperature area and ensures that it is always in an inert gas atmosphere in the high-risk temperature range, thereby fundamentally curbing the occurrence of severe oxidation.

[0041] 2. The circulating cooling coil water cooling system on the outer wall can quickly remove a large amount of radiant heat absorbed by the protective cover body, effectively reducing the temperature of the protective cover itself. This avoids the problem of gas pre-expansion, reduced protective effect, or even damage caused by overheating of the protective cover, which helps K-TIG to be welded for a long time. At the same time, it also helps to reduce the surface temperature of the workpiece and enhances the actual effect of the protective gas.

[0042] 3. Through the gas diffusion pathways of damping plugs, multi-layer dense-hole copper mesh, and perforated plates, a secondary flow equalization effect is achieved, making the outflowing gas more gentle and uniform, forming a laminar flow air curtain, effectively preventing turbulence from entraining air into the protected area, and ensuring the reliability of the protection effect.

[0043] 4. After applying this utility model, the tail of the K-TIG weld shows a uniform silver-white or golden-yellow (dense oxide film), which eliminates or greatly reduces subsequent cleaning work, significantly improves the appearance quality and corrosion resistance of the welded joint, avoids product scrapping caused by welding oxidation defects, saves production costs, and improves production efficiency.

[0044] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A K-TIG welding tail protection device, characterized in that: include, A protective cover (1) is provided in which a protective cavity (11) is provided, a damping nozzle (2) is provided on the protective cover (1), a cooling circulation coil (3) is provided on the outside of the protective cover (1), and a multi-layer dense copper mesh (4) and a perforated plate (5) are provided in the protective cavity (11).

2. The K-TIG welding tail protection device according to claim 1, characterized in that: The damping nozzle (2) includes a limiting plate (21) and a threaded pipe (22) disposed below the limiting plate (21), and an air inlet pipe (23) is disposed above the limiting plate (21).

3. The K-TIG welding tail protection device according to claim 2, characterized in that: The protective cover (1) is provided with a threaded hole, and the threaded tube (22) is connected to the threaded hole.

4. The K-TIG welding tail protection device according to claim 3, characterized in that: A damping plug (24) is provided below the threaded tube (22).

5. The K-TIG welding tail protection device according to claim 4, characterized in that: An arc-shaped groove (12) is provided at one end of the protective cover (1).

6. The K-TIG welding tail protection device according to claim 5, characterized in that: The cooling circulation coil (3) includes U-shaped tubes (31) disposed on both sides of the protective cover (1) and connecting pipes (32) connecting one end of the two U-shaped tubes (31).

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