Welding protective cover for manual argon arc welding

Abstract

The utility model relates to the technical field of argon arc welding, in particular to a welding protective cover for manual argon arc welding. Comprising a mounting cylinder, the mounting cylinder is coaxially sleeved with an insulating cylinder, a connecting cylinder is coaxially arranged below the mounting cylinder, the connecting cylinder is in threaded connection with the mounting cylinder, an insulating cover is coaxially arranged on the connecting cylinder, and a connecting hole allowing the connecting cylinder to penetrate through is coaxially formed in the insulating cover. The upper end face of the insulating cover is attached to the lower end face of the insulating cylinder, the lower end of the connecting cylinder is provided with a limiting boss, and the insulating cover is provided with a limiting face used in cooperation with the limiting boss. According to the utility model, the connection with an external welding gun is realized by arranging the mounting cylinder, and an argon and tungsten needle channel is formed among the mounting cylinder, the connecting cylinder and the insulating cover. And it is ensured that during deep groove welding, gas protection around the tungsten electrode is more uniform and compact, air is effectively isolated, welding seam oxidation is avoided, and the welding quality is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of argon arc welding technology, specifically a welding protective cover for manual argon arc welding. Background Technology

[0002] Manual tungsten inert gas (TIG) welding is an important welding method in welding production. It is an arc welding method that utilizes an inert gas (argon) shielding. Argon gas ejected from the nozzle creates a thick, dense protective layer during welding, isolating the workpiece from the air. Surrounded by this laminar flow of argon, the electric arc burns between the tungsten electrode and the workpiece. The heat generated by the arc melts the weld joint and filler wire, joining the two separate metals together to obtain a strong welded joint. TIG welding has a wide range of applications and can be used to weld various materials, such as low-alloy high-strength steel, stainless steel, heat-resistant steel, copper, titanium and their alloys, aluminum, magnesium and their alloys, etc.

[0003] Utility model patent CN220127819U discloses a DC tungsten inert gas (TIG) welding machine, including a welding torch, a welding pipe, and a welding machine. One end of the welding pipe is connected to the welding torch, and the other end is connected to the welding machine. The welding torch includes a cable, an argon gas conduit, an active flux conduit, a tungsten electrode, an active flux nozzle, and an argon gas nozzle. The cable is connected to the tungsten electrode, the argon gas conduit is connected to the argon gas nozzle, and the active flux conduit is connected to the active flux nozzle. The cable, argon gas conduit, and active flux conduit are enclosed inside the welding pipe. An active flux nozzle is provided on the side of the welding torch and is connected to the active flux conduit inside the welding torch.

[0004] The aforementioned patent can complete the welding of the weld seam, but when facing the working state of a fan-shaped welding groove with a depth of 50-100mm and a width of 10-12mm, the extension length of the tungsten needle will be very long, the tungsten inert gas protection effect will be poor, and the welding quality will ultimately fail to meet the usage requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a welding protective cover for manual argon arc welding, which is used to protect the protruding tungsten needle and solves the problem that the welding quality cannot meet the requirements when manually argon arc welding deep bevels of 50-100mm.

[0006] The technical solution adopted by this utility model to solve its technical problem is a manual argon arc welding protective cover, including an installation cylinder, an insulating cylinder coaxially sleeved on the installation cylinder, a connecting cylinder coaxially arranged below the installation cylinder, the connecting cylinder being threadedly connected to the installation cylinder, an insulating cover coaxially arranged on the connecting cylinder, a connecting hole coaxially arranged on the insulating cover for the connecting cylinder to pass through, the upper end face of the insulating cover fitting against the lower end face of the insulating cylinder, a limiting boss provided at the lower end of the connecting cylinder, and a limiting surface provided on the insulating cover for use with the limiting boss.

[0007] Furthermore, at least two mounting ring grooves are provided at axial intervals on the outer circumferential surface of the mounting cylinder, and a flexible positioning ring is provided in the mounting ring groove.

[0008] Furthermore, the inner diameter of the lower end of the insulating cover is larger than the inner diameter of the insulating cylinder.

[0009] Furthermore, the upper surface of the limiting boss is a conical surface, and the limiting surface is also a conical surface.

[0010] Furthermore, a guide plate is coaxially arranged inside the insulating cover, and guide holes are evenly distributed on the guide plate.

[0011] Furthermore, both the insulating cylinder and the insulating cover are made of glass, and a protective pad is provided between the upper end face of the insulating cover and the lower end face of the insulating cylinder.

[0012] Furthermore, a limiting stage is coaxially provided in the inner cavity at the lower end of the insulating cylinder.

[0013] The beneficial effects of this invention are as follows: By setting up an installation cylinder to connect with an external welding torch, a channel for argon gas and tungsten needles is formed between the installation cylinder, connecting cylinder, and insulating cover. This solves the problem that when manually welding deep bevels using argon arc welding, the tungsten electrode gas cannot form a good protective layer due to the excessive length of the tungsten needle and the excessive depth of the bevel. It ensures that during deep bevel welding, the gas protection around the tungsten electrode is more uniform and dense, effectively isolating air, preventing weld oxidation, and significantly improving welding quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram showing the connection between the mounting cylinder and the insulating cylinder;

[0016] Figure 3 This is a schematic diagram of the connection between the connecting cylinder and the insulating cover.

[0017] Reference numerals in the attached drawings: 1-mounting cylinder; 2-insulating cylinder; 3-connecting cylinder; 4-insulating cover; 5-limiting boss; 6-limiting surface; 7-mounting ring groove; 8-flexible positioning ring; 9-guide plate; 10-guide hole; 11-protective pad; 12-limiting platform. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] like Figures 1-3 As shown, the present invention relates to a manual argon arc welding protective cover, comprising an installation cylinder 1, an insulating cylinder 2 coaxially sleeved on the installation cylinder 1, a connecting cylinder 3 coaxially disposed below the installation cylinder 1, the connecting cylinder 3 being threadedly connected to the installation cylinder 1, an insulating cover 4 coaxially disposed on the connecting cylinder 3, a connecting hole coaxially disposed on the insulating cover 4 for the connecting cylinder 3 to pass through, the upper end face of the insulating cover 4 being in contact with the lower end face of the insulating cylinder 2, a limiting boss 5 being disposed at the lower end of the connecting cylinder 3, and a limiting surface 6 being disposed on the insulating cover 4 for use with the limiting boss 5.

[0020] The mounting cylinder 1 is made of metal with internal threads machined on its inner wall to mate with the external threads of the welding torch head, thus achieving a fixed connection between the mounting cylinder 1 and the welding torch. The lower end of the mounting cylinder 1 has internal threads, and the upper end of the connecting cylinder 3 has corresponding external threads. The connecting cylinder 3 is rotated to connect the mounting cylinder 1 and the connecting cylinder 3. The insulating cover 4 has a central connecting hole with a diameter larger than the outer diameter of the connecting cylinder 3. For example, if the outer diameter of the connecting cylinder 3 is 10mm, the diameter of the connecting hole is 11mm, allowing the connecting cylinder 3 to pass through the insulating cover 4 and be coaxially fixed with it. The lower end of the connecting cylinder 3 has a limiting boss 5, and the inner side of the insulating cover 4 has a corresponding limiting surface 6. The outer diameter of the limiting boss 5 is larger than the inner diameter of the connecting hole. Thus, after the connecting cylinder 3 is screwed into the lower end of the mounting cylinder 1, the lower end of the mounting cylinder 1 and the limiting boss 5 work together to axially limit the insulating cover 4. A channel for argon gas and tungsten needles is formed between the mounting cylinder 1, the connecting cylinder 3, and the insulating cover 4.

[0021] To achieve stability of insulating cylinder 2 and mounting cylinder 1, further, see... Figure 2 At least two mounting ring grooves 7 are spaced axially on the outer circumferential surface of the mounting cylinder 1, and flexible positioning rings 8 are disposed within the mounting ring grooves 7. The outer surface of the mounting cylinder 1 is machined with at least two mounting ring grooves 7 spaced axially, and flexible positioning rings 8 made of rubber or silicone are embedded within the grooves. When the mounting cylinder 1 is installed inside the insulating cylinder 2, the flexible positioning rings 8 are compressed and deformed, filling the gap between the mounting cylinder 1 and the insulating cylinder 2, enhancing adaptability and fixing stability.

[0022] To further expand the protective gas coverage, see [link to relevant documentation]. Figure 1 The inner diameter of the lower end of the insulating cover 4 is larger than the inner diameter of the insulating cylinder 2. This larger inner diameter of the lower end of the insulating cover 4 creates a gradually expanding gas cavity. During welding, the argon gas is dispersed by the guide plate 9 and further diffuses within the gradually expanding gas cavity, increasing the coverage area of ​​the protective gas. This is particularly suitable for bevels 10-12mm wide, ensuring effective protection of the bottom and sidewalls of the bevel.

[0023] To facilitate the connection between the connecting cylinder 3 and the insulating cover 4, further see... Figure 3The upper surface of the limiting boss 5 is a conical surface, and the limiting surface 6 is also a conical surface. Both the upper surface of the limiting boss 5 and the limiting surface 6 are designed as conical surfaces of 30°-45°. During assembly, the conical contact generates a radial force, forcing the insulating cover 4 to fit tightly against the connecting cylinder 3, eliminating axial gaps. At the same time, the conical fit can automatically correct coaxiality deviations and improve assembly accuracy.

[0024] To ensure a more uniform flow of argon gas from outlet 4 of the insulating cover, further see... Figure 3 A guide plate 9 is coaxially disposed inside the insulating cover 4, and guide holes 10 are evenly distributed on the guide plate 9. The guide plate 9 is an annular rubber plate, which can be installed inside the insulating cover 4 by interference fit. Multiple guide holes 10 with a diameter of 1-2 mm are evenly distributed on the surface of the guide plate 9. Argon gas enters the insulating cover 4 after passing through the welding torch, mounting cylinder 1 and connecting cylinder 3 in sequence. It forms multiple fine airflows through the guide holes 10, which are evenly distributed as a laminar flow gas curtain and flow out from the outlet of the insulating cover 4, significantly improving the protection effect of deep bevel welding.

[0025] To more clearly observe the condition of the weld, please refer to [further details]. Figure 3 Both the insulating cylinder 2 and the insulating cover 4 are made of glass, and a protective pad 11 is provided between the upper end face of the insulating cover 4 and the lower end face of the insulating cylinder 2. The insulating cylinder 2 and the insulating cover 4 are made of high-temperature resistant quartz glass, which can withstand the high temperature of electric arcs and has excellent insulation performance. The silicone protective pad 11 is provided between the lower end face of the insulating cylinder 2 and the upper end face of the insulating cover 4 to buffer mechanical impact, prevent the glass components from breaking through direct contact, and maintain airtightness.

[0026] To better achieve axial positioning between mounting cylinder 1 and insulating cylinder 2, further refer to... Figure 2 A limiting platform 12 is coaxially arranged in the inner cavity at the lower end of the insulating cylinder 2. The inner cavity at the lower end of the insulating cylinder 2 has an annular limiting platform 12 machined coaxially, the inner diameter of which is smaller than the outer diameter of the mounting cylinder 1 but larger than its inner diameter. During assembly, the mounting cylinder 1 is inserted into the insulating cylinder 2 until its lower end abuts against the limiting platform 12, ensuring the coaxiality of the insulating cylinder 2 and the mounting cylinder 1 and preventing misalignment from affecting the argon gas flow path.

[0027] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A protective cover for manual argon arc welding, comprising a mounting cylinder (1), characterized in that: An insulating cylinder (2) is coaxially sleeved on the mounting cylinder (1). A connecting cylinder (3) is coaxially arranged below the mounting cylinder (1). The connecting cylinder (3) is threadedly connected to the mounting cylinder (1). An insulating cover (4) is coaxially arranged on the connecting cylinder (3). A connecting hole for the connecting cylinder (3) to pass through is coaxially arranged on the insulating cover (4). The upper end face of the insulating cover (4) is in contact with the lower end face of the insulating cylinder (2). A limiting boss (5) is provided at the lower end of the connecting cylinder (3). A limiting surface (6) is provided on the insulating cover (4) to cooperate with the limiting boss (5).

2. The manual argon arc welding protective cover as described in claim 1, characterized in that: At least two mounting ring grooves (7) are provided at axial intervals on the outer circumferential surface of the mounting cylinder (1), and a flexible positioning ring (8) is provided in the mounting ring groove (7).

3. The manual argon arc welding protective cover as described in claim 1, characterized in that: The inner diameter of the lower end of the insulating cover (4) is larger than the inner diameter of the insulating cylinder (2).

4. The manual argon arc welding protective cover as described in claim 1, characterized in that: The upper surface of the limiting boss (5) is a conical surface, and the limiting surface (6) is also a conical surface.

5. The manual argon arc welding protective cover as described in claim 1, characterized in that: A guide plate (9) is coaxially arranged inside the insulating cover (4), and guide holes (10) are evenly distributed on the guide plate (9).

6. The manual argon arc welding protective cover as described in claim 1, characterized in that: Both the insulating cylinder (2) and the insulating cover (4) are made of glass, and a protective pad (11) is provided between the upper end face of the insulating cover (4) and the lower end face of the insulating cylinder (2).

7. The manual argon arc welding protective cover as described in claim 1, characterized in that: A limiting stage (12) is coaxially arranged in the inner cavity at the lower end of the insulating cylinder (2).

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