Welding gun gas protection cover for welding titanium alloy round pipe

Abstract

The utility model relates to a welding gun gas protection cover for titanium alloy circular tube welding, which comprises a circular ring-shaped protection cover, a sleeve hole in the middle of the protection cover is sleeved on a porcelain nozzle of a welding gun, a circular ring-shaped groove cavity is axially arranged on the end face of one side of the protection cover, and a gas tube is connected on the outer circumference of the protection cover close to the bottom of the groove cavity. An annular pipe is arranged around the annular cavity close to the bottom in the groove cavity, the air pipe is communicated with the annular pipe, air holes are evenly distributed in the circumference of the side, facing the bottom of the groove cavity, of the annular pipe, and the side, close to an opening of the groove cavity, of the annular pipe is covered with a copper net. Protective gas is introduced into the protective cover, protective gas flow penetrates through the copper net to stably flow out, the protective area of a welding area is increased, harmful gas such as oxygen, nitrogen and hydrogen in air can be effectively isolated, the protective cover annularly sleeves the ceramic nozzle of the welding gun, the ceramic nozzle is large in size, sleeving is convenient, the protective area is increased, and the service life of the welding gun is prolonged. The problem that tail cover protection cannot be carried out during butt joint of small-diameter welded pipes is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium alloy product production, in particular to a welding gun gas protection cover for titanium alloy round pipe welding. Background Art

[0002] When titanium plate materials are welded, the air contains a large amount of nitrogen and oxygen. Due to its own characteristics, when the welding temperature reaches 250°C, the welding part absorbs hydrogen from the air, absorbs oxygen at 400°C, and absorbs nitrogen at 600°C. If there is no suitable titanium protective cover during welding, the weld is prone to oxidation, forming pores or cracks, resulting in unqualified weld quality or even scrapping. When welding flat titanium plates, timely covering of the welding area can avoid air oxidation, but when welding the cylinder, shielding is more difficult. For the welding of the longitudinal seam or circumferential seam of the large-diameter cylinder, an exhaust gas protection cover can be made at the tail of the welding gun. One person can hold the welding gun in front and weld, and the other person can hold the drag cover for protection in the back to perform two-person synchronous cooperation welding. However, when connecting small-diameter pipes, due to the small pipe diameter and limited operating space, two-person synchronous cooperation welding cannot be achieved. Due to the small diameter of the small pipe, the exhaust gas protection cover is generally large, and it is impossible to prepare a very small protection cover that matches the outer diameter arc of the steel pipe. The larger exhaust gas protection cover is fixed on the ceramic nozzle of the smaller diameter welding gun, which makes the exhaust gas protection cover affect the welding line of sight, resulting in a decrease in the metal performance of the titanium weld and frequent welding repairs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a gas protection cover for a welding gun for welding titanium alloy round tubes, so as to solve the problem that small-diameter titanium tubes are easily oxidized during welding.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A welding gun gas shield for welding titanium alloy round tubes comprises an annular protective shield, a sleeve hole penetrates through the middle of the protective shield, the sleeve hole is sleeved on the porcelain nozzle of the welding gun, an annular groove cavity is axially arranged on one end face of the protective shield, the groove cavity is an open groove, the open side of the groove cavity is on the same side as the porcelain nozzle, an air pipe is connected to the outer circumference of the protective shield near the bottom of the groove cavity, an annular tube is arranged around the annular cavity near the bottom of the groove cavity, the air pipe is connected to the annular tube, air holes are evenly distributed on the circumference of the ring tube facing the bottom of the groove cavity, and a copper mesh is covered on one side of the ring tube near the opening of the groove cavity.

[0006] As a preferred embodiment, the diameter of the porcelain nozzle is greater than or equal to half the diameter of the protective cover.

[0007] As a preferred embodiment, the copper mesh is laid in two layers along the axial direction of the slot cavity.

[0008] As a preferred embodiment, the mesh size of the copper mesh is 100 meshes.

[0009] As a preferred embodiment, the diameter of the pores on the ring tube is 1 mm, and three rows are arranged adjacent to each other along the axial direction of the ring tube.

[0010] The beneficial effects of the utility model are as follows: protective gas is passed through the protective cover, and the protective gas flow passes through the copper mesh and flows out stably, thereby increasing the protection area of ​​the welding area and effectively isolating harmful gases such as oxygen, nitrogen, and hydrogen in the air. The protective cover is annularly sleeved on the porcelain nozzle of the welding gun. The porcelain nozzle is selected to be of a larger size, which is convenient for sleeve installation and increases the protection area. The problem that small-diameter welding pipes cannot be protected by the tail cover when butt jointing and titanium welding is prone to oxidation is solved. The utility model has a simple structure, is flexible and lightweight, does not require two people to cooperate in welding, and effectively saves labor welding costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0012] Figure 1 It is a cross-sectional view of the utility model;

[0013] Figure 2 It is a top view of the utility model;

[0014] Figure 1~Figure 2 Explanation of the reference numerals in the accompanying drawings: 1. air pipe; 2. protective cover; 3. ring pipe; 4. air hole; 5. groove cavity; 6. copper mesh; 7. sleeve hole; 8. welding gun; 9. porcelain nozzle. DETAILED DESCRIPTION

[0015] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.

[0016] like Figure 1~Figure 2 The welding torch gas shield for titanium alloy round tube welding shown in the figure comprises a circular ring-shaped shield 2, a sleeve hole 7 is penetrated in the middle of the shield 2, the sleeve hole 7 is sleeved on the porcelain nozzle 9 of the welding torch 8, a circular ring-shaped groove cavity 5 is arranged along the axial direction on one side end face of the shield 2, the groove cavity 5 is an open groove, and the opening side of the groove cavity 5 is on the same side as the porcelain nozzle 9, and the outer circumference of the shield 2 is connected with an air pipe 1 near the bottom of the groove cavity 5, and the inner circumference of the groove cavity 5 is provided with an annular cavity around the bottom, the air pipe 1 is connected with the annular tube 3, and the annular tube 3 is evenly distributed with air holes 4 on one side of the annular tube 3 facing the bottom of the groove cavity 5, and the side of the annular tube 3 near the opening of the groove cavity 5 is covered with a copper mesh 6. The diameter of the air holes 4 on the annular tube 3 is 1 mm, and three rows are arranged adjacently along the axial direction of the annular tube 3. Among them, the copper mesh 6 is laid in two layers along the axial direction of the groove cavity 5. The mesh number of the copper mesh 6 is selected to be 100 mesh.

[0017] Specifically, the diameter of the porcelain nozzle 9 is greater than or equal to half of the diameter of the protective cover 2. The purpose is to select a larger porcelain nozzle 9 for the welding gun 8, so that the protective cover 2 can be installed on the porcelain nozzle 9. The material of the protective cover 2 is copper, which is convenient for heat dissipation. The air pipe 1 and the ring pipe 3 are made of copper tubes, which are convenient for heat dissipation and high temperature resistance. The top of the ring pipe 3 is drilled with three rows of 1mm holes. The ring pipe 3 is opened in the middle of the bottom of the groove cavity 5, and one row is opened on both sides at an angle of 45 degrees. The three exhaust holes 4 ensure that the protective airflow flows out evenly and sufficiently. Two layers of fine copper mesh 6 need to be laid on the surface. The best mesh size is 100 mesh. Ensure that the argon gas sprayed from the ring tube 3 is first sprayed upward to the top inner wall of the protective cover 2, and then flows back from the top to the copper mesh 6 below. The argon gas flows out from the opening of the groove cavity 5 to ensure that the argon gas coming out of the copper mesh 6 is uniform and has no turbulence. For the weld that has just been welded and has not yet cooled, it plays an effective role in isolating the air with protective gas. The protective cover 2 can effectively protect the welded joint from oxidation, making the weld color silvery white or golden yellow.

[0018] The working process of the utility model is as follows:

[0019] As shown in Figures 1-2, first, the sleeve hole 7 of the protective cover 2 is sleeved on the porcelain nozzle 9 of the welding gun 8, then, argon gas is passed through the air pipe 1, and finally, the welding gun 8 is held by hand for welding.

[0020] The above embodiments are only illustrative of the principles and effects of the invention of the utility model, as well as some embodiments of its application, and are not intended to limit the invention of the utility model. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A welding torch gas shield for titanium alloy round tube welding, characterized in that: The invention comprises a circular protective cover (2), a sleeve hole (7) passing through the middle of the protective cover (2), the sleeve hole (7) being sleeved on the porcelain nozzle (9) of the welding gun (8), a circular groove cavity (5) being arranged along the axial direction on one end surface of the protective cover (2), the groove cavity (5) being an open groove, the open side of the groove cavity (5) being on the same side as the porcelain nozzle (9), an air pipe (1) being connected to the outer circumference of the protective cover (2) near the bottom of the groove cavity (5), an annular tube (3) being arranged around the circular cavity near the bottom inside the groove cavity (5), the air pipe (1) being connected to the annular tube (3), the annular tube (3) being uniformly distributed on the circumference of one side of the ring tube (3) facing the bottom of the groove cavity (5), and a copper mesh (6) being covered on the side of the ring tube (3) near the opening of the groove cavity (5).

2. The welding torch gas shield for titanium alloy round tube welding according to claim 1 is characterized in that: The diameter of the porcelain nozzle (9) is greater than or equal to half the diameter of the protective cover (2).

3. The welding torch gas shield for titanium alloy round tube welding according to claim 1 is characterized in that: The copper mesh (6) is laid in two layers along the axial direction of the slot cavity (5).

4. The gas shield for welding torch for titanium alloy round tube welding according to claim 1, characterized in that: The mesh number of the copper mesh (6) is 100 meshes.

5. The welding torch gas shield for titanium alloy round tube welding according to claim 1, characterized in that: The diameter of the pores (4) on the annular tube (3) is 1 mm, and three rows are arranged adjacent to each other along the axial direction of the annular tube (3).

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