Titanium alloy pipe screwed joint welding protection tool

Abstract

The invention discloses a titanium alloy pipe screwed joint welding tool. The titanium alloy pipe screwed joint welding tool comprises a rotary table and a protective cover. The rotary table is composed of a base, a motor, a motor support, a rotary table cylinder, a bearing, an inner plate, a rotary table face and a rotary shaft. The protective cover is composed of a protective cover body, a threaded connector, a welding seam, a welding piece, a sleeve, an inflation hole, tin foil paper, sponge and an iron gauze. The motor directly drives the rotating shaft to drive the weldment to rotate to realize semi-automatic welding; inert gas is filled in the protective cover and is uniformly dispersed through the sponge and the iron gauze, a stable low-temperature environment is formed, and welding seam oxidation is prevented. The inflation tube is fixed to avoid touching a high-temperature part, and safety is improved; a single weld joint is formed at a time, welding efficiency is improved, manpower is saved, and welding quality is remarkably improved. The method is suitable for efficient protective welding of the titanium alloy pipe screwed joint.

Description

Technical Field

[0001] This application relates to the field of titanium alloy welding protection technology, and in particular to a welding protection tool for titanium alloy pipe thread joints. Background Technology

[0002] There are currently no application examples of new titanium alloys for ships in the shipbuilding industry, and there is also little related research and application in other industrial fields. In order to achieve efficient and high-quality production of large thin-walled titanium alloy hull structures, titanium alloy pipelines, as a part of them, urgently need to solve the welding protection problem during the manufacturing process and improve welding efficiency.

[0003] With the vigorous promotion of the development and application of titanium and titanium alloys in national defense marine equipment and engineering vessels, how to solve the engineering problems of titanium construction has become a common technical pain point for adaptive expansion applications. Compared with foreign technology, my country's titanium for shipbuilding is still in the exploratory trial stage of analysis and demonstration, and cannot yet meet the needs of large-scale engineering applications. There is still a certain gap in titanium welding technology, which is reflected in the limited application of advanced welding processes and methods, low welding efficiency and difficulty in quality control; the low level of mechanization and automation in titanium alloy equipment manufacturing; a significant gap in the research and development and application of welding process technologies and equipment; and a lack of in-depth research on the relationship between titanium alloy welding processes and microstructure and properties, resulting in a lack of originality and advancement in process technologies and equipment.

[0004] The welding process in titanium alloy pipe manufacturing generally suffers from problems such as high porosity, easy oxidation under heat, and low welding efficiency. These technological challenges persist throughout the entire titanium alloy pipe manufacturing process, presenting severe challenges in adapting welding processes to new naval titanium alloy pipes, controlling technical aspects, improving production efficiency, and ensuring quality control. Due to the special properties of the material, titanium alloy pipes require special protection during welding. At the high temperatures during welding, the weld seam directly exposed to air will oxidize, affecting weld quality and failing to meet requirements. Therefore, it is essential to immediately protect the completed weld seam, both internally and externally, to prevent oxidation. Consequently, various researches have been conducted on different welding methods used in pipe manufacturing. For small-diameter titanium alloy pipes (∮22mm, ∮25mm, ∮32mm, ∮38mm), threaded joints are frequently used. Welding protection methods and tooling specifically developed for welding threaded joints of titanium alloy pipes are used to protect the weld seam, which is still at a high temperature during the welding process, thus improving the quality and efficiency of welding threaded joints in titanium alloy pipes. Traditionally, threaded joint welding uses inert gas from a large welding torch nozzle to protect the freshly welded high-temperature weld. However, the protective gas from the nozzle is small, only protecting a weld length of about 10mm. Each time welding, the nozzle has to stop after welding about 10mm and wait for the weld to cool before continuing. This process of welding and stopping repeatedly takes 6 or 7 times to complete a single weld, resulting in extremely low efficiency. Furthermore, the small protective area of ​​the nozzle makes it easy to fail to protect the weld properly, thus affecting the weld quality. Summary of the Invention

[0005] The purpose of this invention is to provide a welding protective fixture for titanium alloy pipe threaded joints. This fixture uses a standardized protective cover to weld various small-diameter titanium alloy pipe threaded joints, achieving welding quality requirements and improving welding efficiency. The invented welding protective fixture for threaded joints completely surrounds the threaded joint and the welding process with an inert protective gas. During welding, the pipe with the threaded joint automatically rotates, achieving one-time welding and forming, thus ensuring better welding quality. Furthermore, the welding process does not require stopping, increasing efficiency by more than 6 times. The fixed welding protective cover ensures more stable gas filling, protecting the weld from high-temperature oxidation. The automatic rotation of the titanium alloy pipe threaded joint pipe achieves one-time welding and forming, avoiding multiple arc initiation and termination points for a single weld, thus preventing quality problems that are prone to occur at the arc initiation and termination points. This welding protective fixture for titanium alloy pipe threaded joints effectively improves welding quality and efficiency.

[0006] This invention provides a welding protection fixture for titanium alloy pipe thread joints, the fixture comprising: a turntable and a protective cover; The turntable consists of a motor, a motor bracket, a base, an inner plate, bearings, a rotating shaft, a turntable cylinder, and a turntable surface; The protective cover consists of a protective cover body, an air inlet, a sponge, a sleeve, a wire mesh, and tin foil. The base has the turntable cylinder fixed on its top surface to stabilize the entire tooling. The motor is installed inside the turntable cylinder and fixed on the motor bracket. Its output shaft is connected to the rotating shaft and drives the rotating shaft to rotate during operation. The motor bracket is fixed below the turntable surface; The outer diameter of the rotating shaft matches the inner hole of the bearing and is embedded in the bearing. It is fitted into the sleeve at the same height as the sponge. One end has an opening to match and connect with the motor output shaft, and the other end has a step. The bearing is fixed in the inner hole of the inner plate, and the rotating shaft is embedded in the middle of the bearing; The bearing is embedded in the inner hole of the inner plate and fixed to the bottom of the turntable surface; The turntable cylinder is fixed to the top surface of the base; The turntable surface has a hole in the middle, into which the rotating shaft is embedded; The protective cover body has a flat end and a saddle-shaped opening at the other end. An air hole is opened on one side of the flat end. The flat end is welded to the turntable surface. The tin foil is attached to the saddle-shaped opening end. The sponge and the sleeve are arranged inside the flat end. Three layers of wire mesh are arranged above the sponge and the sleeve. The sleeve is fixed on the turntable surface, the rotating shaft passes through the sleeve, and the outer wall of the sleeve is covered with the sponge; The inflation port is used to fill in protective gas; The sponge is evenly arranged in the lower inner space of the flat end of the protective cover body, outside the sleeve, and between the wire mesh and the turntable surface; The wire mesh is arranged above the sponge and the sleeve, in three layers; The tin foil partially seals the saddle opening of the protective cover body, forming a semi-sealed space with the protective cover body, and is adjusted according to the actual welding state.

[0007] In some embodiments, the motor bracket is fixed below the turntable surface and connected to the motor to fix the motor.

[0008] In some embodiments, the inner plate is fixed below the turntable surface, and the bearing is embedded in the inner hole to fix the bearing.

[0009] In some embodiments, the bearing matches the inner hole of the inner plate and is embedded in the inner hole of the inner plate, with the rotating shaft embedded in the middle of the bearing, and rotates with the rotating shaft during operation.

[0010] In some embodiments, the rotating shaft is embedded in the inner hole of the bearing, and is fitted into the sleeve at the same height as the sponge. The open end is connected to the motor output shaft, and the stepped end is inserted into the threaded joint end of the corresponding weldment. During operation, it rotates together with the motor output shaft.

[0011] In some embodiments, the turntable cylinder protects the motor, the motor bracket, the inner plate, and the bearing, connects the base and the turntable surface, and fixes the turntable surface.

[0012] In some embodiments, the turntable surface is fixed on the turntable cylinder, and the inner plate, the motor bracket, and the protective cover body are fixed thereon, connecting the turntable and the protective cover.

[0013] In some embodiments, the protective cover body is fixed on the turntable surface, and the sponge, the sleeve, and the wire mesh are placed inside to form a semi-sealed space, in which inert gas entering through the air inlet flows within the space inside the protective cover.

[0014] In some embodiments, the sponge is arranged in the lower space of the protective cover so that the incoming inert protective gas can uniformly fill the entire protective cover.

[0015] In some embodiments, the sleeve is arranged outside the rotating shaft at the same height as the sponge, fixed on the turntable surface, stabilizes the rotating shaft, and isolates the sponge from the rotating shaft.

[0016] In some embodiments, the three layers of wire mesh are arranged on the sponge and the sleeve to prevent the welded parts from contacting the sponge and to avoid the high-temperature threaded joints after welding burning the sponge.

[0017] The turntable and shielded welding are combined into one unit. A motor is added, which directly drives the rotating shaft to rotate, thereby driving the workpiece to rotate, realizing semi-automatic welding. The air inlet tube is fixed, so it will not come into contact with the titanium alloy tube being welded, the threaded joint, the welding gun, or the hands, and will not be burned by the high temperature of the welding tube, thus ensuring high safety. With this welding fixture, the protective gas flows evenly and slowly inside the protective cover, extending the time for protecting the weld and improving the welding quality. Traditionally, welding protective covers for titanium alloy pipes required manual movement, necessitating four arc initiation and termination steps for each weld seam. This was inefficient and prone to quality issues at the arc initiation and termination points. Alternatively, manual rotation of the weldment required an additional person, wasting labor. This new welding fixture automatically rotates the titanium alloy pipe weldment, enabling a single arc initiation and termination for each weld seam, achieving a one-step process. This saves three-quarters of the welding time, significantly improving both welding quality and efficiency.

[0018] This protection method and tooling eliminate the need for an additional person to rotate the workpiece, achieving semi-automatic welding and saving manpower. Attached Figure Description

[0019] The accompanying drawings illustrate, by way of example and not limitation, the various embodiments discussed herein.

[0020] Figure 1 This is a schematic cross-sectional view of a welding protection tool for a titanium alloy pipe thread joint according to an embodiment of the present invention.

[0021] Symbol explanation: 1-Base; 2-Motor; 3-Motor bracket; 4-Turntable cylinder; 5-Bearing; 6-Inner plate; 7-Turntable surface; 8-Sponge, sleeve; 9-Wire mesh; 10-Shaft; 11-Protective cover body; 12-Threaded joint; 13-Weld; 14-Welded part; 15-Sleeve; 16-Inflation hole; 17-Tin foil. Detailed Implementation

[0022] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0023] In the embodiments described in this application, it should be noted that, unless otherwise stated and limited, the term "connection" should be interpreted broadly. For example, it can be an electrical connection, or a connection between two internal components. It can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above term according to the specific circumstances.

[0024] It should be noted that the terms "first," "second," and "third" used in the embodiments of this application are merely used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first," "second," and "third" can be interchanged in a specific order or sequence where permitted. It should be understood that the objects distinguished by "first," "second," and "third" can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein.

[0025] like Figure 1 As shown, a welding fixture for titanium alloy pipe thread joints includes: a turntable, which consists of a base 1, a motor 2, a motor bracket 3, an inner plate 6, a bearing 5, a rotating shaft 10, a turntable cylinder 4, and a turntable surface 7; and a protective cover, which consists of a protective cover body 11, an air hole 16, a sponge 8, a sleeve 15, a wire mesh 9, and tin foil 17.

[0026] The base 1, motor 2, motor bracket 3, inner plate 6, bearing 5, rotating shaft 10, turntable cylinder 4, and turntable surface 7 are combined to form a turntable. When the motor 2 is started, the motor 2 rotates, driving the rotating shaft 10 to rotate, which in turn drives the bearing 5 to rotate.

[0027] The upper part of the rotating shaft 10 is in the semi-enclosed space of the protective cover, and the top end is inserted into the threaded joint 12 end of the weldment 14.

[0028] The turntable 7, the protective cover body 11, the air inlet 16, the sponge 8, the sleeve 15, the wire mesh 9, and the tin foil 17 form a semi-enclosed space. After the protective gas enters through the air inlet 16, it passes through the sponge 8 and the wire mesh 9 to form a uniform and stable low-temperature environment inside the protective cover body 11, protecting the newly welded high-temperature weld 13 from oxidation.

[0029] Figure 1 As an embodiment of the present invention: In this embodiment, the on-site construction personnel insert the threaded connector 12 end of the titanium alloy tube to be welded into the top of the rotating shaft 10 of this tooling, matching the corresponding step on the top of the rotating shaft 10, keeping the threaded connector 12 end of the weldment 14 vertically positioned. Inert protective gas is injected into the protective cover body 11 through the inflation hole 16, and then directly injected into the interior of the weldment 14 (titanium alloy tube) from the other end of the weldment titanium alloy tube. After the protective cover is filled with inert protective gas, the motor 2 is started, and the output shaft of the motor 2 rotates, driving the rotating shaft 10 to rotate, which in turn drives the weldment 14 and bearing 5 to rotate. The weld 13 at the connection between the threaded connector 12 of the titanium alloy tube and the titanium alloy tube rotates at a uniform speed with the rotating shaft 10, and welding begins. One rotation of the weldment 14 completes one weld 13. During welding, all welds 13 are encased in protective gas, preventing oxidation.

[0030] A welding fixture for titanium alloy pipe threaded joints, characterized in that it comprises: The turntable consists of a motor 2, a motor bracket 3, a base 1, an inner plate 6, a bearing 5, a rotating shaft 10, a turntable cylinder 4, and a turntable surface 7.

[0031] The protective cover consists of a protective cover body 11, an air inlet 16, a sponge 8, a sleeve 15, a wire mesh 9, and tin foil 17.

[0032] Base 1, a steel plate of ∮500X30mm, on which the turntable cylinder 4 is fixed to stabilize the entire fixture.

[0033] Motor 2 is installed inside the turntable cylinder 4 and fixed on the motor bracket 3. Its output shaft is embedded in the rotating shaft 10, which drives the rotating shaft 10 to rotate.

[0034] The motor bracket 3 is fixed below the turntable surface 7.

[0035] The rotating shaft 10 is a ∮42XL350mm steel rod with an outer diameter that matches the inner hole of the bearing 5 and is embedded in the bearing 5. It is fitted into the sleeve 15 at the same height as the sponge 8. One end has an opening that matches and connects with the output shaft of the motor 2. The other end has steps of ∮19X30mm, ∮22X30mm, ∮29X30mm, and ∮35X30mm.

[0036] The bearing 5 is fixed in the inner hole of the inner plate 6, and the rotating shaft 10 is embedded in the middle of the bearing 5.

[0037] Inner plate 6 is a steel plate with a diameter of 153 x 80 (inner hole) x 20 mm (thickness). A bearing 5 is embedded in the inner hole and fixed to the bottom of the turntable surface 7.

[0038] Turntable cylinder 4, made of 327XL300x15 (thickness) mm steel pipe, is fixed on the base 1.

[0039] The turntable surface 7 is a steel plate with a diameter of 300mm x 43mm (inner hole) x 15mm (thickness), with a 43mm hole in the middle, into which a rotating shaft 10 is embedded.

[0040] The protective cover body 11 is a copper tube with a diameter of ∮108mm, a thickness of 3mm, and a length of 200mm. One end is flat, and the other end is saddle-shaped. An air hole 16 is provided on one side of the flat end. In some embodiments, the air hole 16 is 20mm away from the flat end. The flat end is welded to the turntable surface 7, and the saddle end is covered with tin foil 17. Inside, a sponge 8 and a sleeve 15 are placed at the flat end, and three layers of wire mesh 9 are placed on top of the sponge 8 and the sleeve 15.

[0041] Sleeve 15, a steel pipe of ∮57x7 (wall thickness)x120mm, is fixed on turntable surface 7. Rotating shaft 10 passes through sleeve 15, and sleeve 15 is covered with sponge 8.

[0042] The air inlet 16 is located 15mm from the flat end of the protective cover body 11 and has a diameter of ∮20mm. It is used to fill the protective gas.

[0043] Sponge 8 is evenly distributed in the lower space of the protective cover body 11 and outside the sleeve 15, with a height of 120mm.

[0044] Wire mesh 9 is arranged above sponge 8 and sleeve 15, in a total of 3 layers.

[0045] The tin foil 17 partially seals the saddle opening and, together with the protective cover body 11, forms a semi-sealed space, which can be adjusted according to the actual welding status.

[0046] In some embodiments, the base 1 ensures the stability and balance of the entire device.

[0047] In some embodiments, the motor bracket 3 is fixed below the turntable surface 7 and connected to the motor 2 to fix the motor 2.

[0048] In some embodiments, the motor 2 is installed inside the turntable cylinder 4 and connected to the motor bracket 3. The output shaft is connected to the rotating shaft 10 and drives the rotating shaft 10 to rotate during operation.

[0049] In some embodiments, the inner plate 6 is fixed below the turntable surface 7, and the bearing 5 is embedded in the inner hole to fix the bearing 5.

[0050] In some embodiments, the bearing 5 matches the inner hole of the inner plate 6 and is embedded in the hole of the inner plate 6. The bearing 5 has a rotating shaft 10 embedded in the middle and rotates with the rotating shaft 10 during operation.

[0051] In some embodiments, the rotating shaft 10 is embedded in the inner hole of the bearing 5 and is fitted into the sleeve 15 at the same height as the sponge 8. The open end is connected to the output shaft of the motor 2, and the stepped end is inserted into the threaded connector 12 end of the corresponding weldment 14. During operation, it rotates together with the output shaft of the motor 2.

[0052] In some embodiments, the turntable cylinder 4 protects the motor 2, motor bracket 3, inner plate 6 and bearing 5, connects the base 1 and the turntable surface 7, and fixes the turntable surface 7.

[0053] In some embodiments, the turntable surface 7 is fixed on the turntable cylinder 4, and the inner plate 6, motor bracket 3, and protective cover body 11 are fixed to connect the turntable and the protective cover.

[0054] In some embodiments, the protective cover body 11 is fixed on the turntable surface 7, and a sponge 8, a sleeve 15, and a wire mesh 9 are placed inside to form a semi-sealed space, in which inert gas entering through the air hole 16 flows in the space inside the protective cover.

[0055] In some embodiments, an inflation hole 16 is arranged 15 mm from the flat end of the protective cover body 11, and inert gas is injected uniformly from the inflation hole 16.

[0056] In some embodiments, the sponge 8 is arranged in the lower space of the protective cover so that the incoming inert protective gas can uniformly fill the entire protective cover.

[0057] In some embodiments, the sleeve 15 is arranged outside the rotating shaft 10, at the same height as the sponge 8, and fixed on the turntable surface 7 to stabilize the rotating shaft 10 and isolate the sponge 8 from the rotating shaft 10.

[0058] In some embodiments, the wire mesh 9, specifically the three-layer wire mesh 9, is arranged on the sponge 8 and the sleeve 15 to prevent the welded part 14 from contacting the sponge 8 and to avoid the high-temperature threaded joint 12 after welding from burning the sponge 8.

[0059] In some embodiments, the tin foil 17 is highly malleable and its shape can be adjusted as needed. It partially seals the saddle opening, leaving a small amount of unsealed space so that the welding torch tip can freely extend into the weld seam 13 of the threaded joint 12 inside the protective cover. It combines with the protective cover body 11 to form a semi-sealed space, allowing the protective gas to flow out slowly.

[0060] The turntable and shielded welding are integrated into one unit. A motor 2 is added, which directly drives the rotating shaft 10 to rotate, thereby driving the workpiece 14 to rotate, realizing semi-automatic welding. The air inflator is fixed, so it will not come into contact with the titanium alloy pipe being welded, the threaded joint 12, the welding gun, or the hands, and will not be burned by the high temperature of the welding pipe, thus ensuring high safety. With this welding fixture, the protective gas flows evenly and slowly within the protective cover body 11, extending the time for protecting the weld 13 and improving the welding quality.

[0061] Previously, welding protective covers for titanium alloy pipes required manual movement, necessitating four arc initiation and termination steps for each weld seam 13. This was inefficient and prone to quality issues at the arc initiation and termination points. Alternatively, manual rotation of the weldment 14 required an additional person, wasting labor. This new welding fixture automatically rotates the titanium alloy pipe weldment 14, enabling a single arc initiation and termination for each weld seam 13, achieving a one-step process. This saves three-quarters of the time for each weld seam 13, significantly improving welding quality and efficiency.

[0062] This protection method and tooling eliminates the need for an additional person to rotate the workpiece 14, achieving semi-automatic welding and saving manpower.

[0063] The technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0064] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A welding protection fixture for titanium alloy pipe thread joints, characterized in that, The tooling includes: a turntable and a protective cover; The turntable consists of a motor, a motor bracket, a base, an inner plate, bearings, a rotating shaft, a turntable cylinder, and a turntable surface; The protective cover consists of a protective cover body, an air inlet, a sponge, a sleeve, a wire mesh, and tin foil. The base has the turntable cylinder fixed on its top surface to stabilize the entire tooling. The motor is installed inside the turntable cylinder and fixed on the motor bracket. Its output shaft is connected to the rotating shaft and drives the rotating shaft to rotate during operation. The motor bracket is fixed below the turntable surface; The rotating shaft has an outer diameter that matches the inner hole of the bearing and is embedded in the bearing. It is fitted into the sleeve at the same height as the sponge. One end has an opening that matches and connects to the motor output shaft, and the other end has a step. The bearing is fixed in the inner hole of the inner plate, and the rotating shaft is embedded in the middle of the bearing; The bearing is embedded in the inner hole of the inner plate and fixed to the bottom of the turntable surface; The turntable cylinder is fixed to the top surface of the base; The turntable surface has a hole in the middle, into which the rotating shaft is embedded; The protective cover body has a flat end and a saddle-shaped opening at the other end. An air hole is opened on one side of the flat end. The flat end is welded to the turntable surface. The tin foil is attached to the saddle-shaped opening end. The sponge and the sleeve are arranged inside the flat end. Three layers of wire mesh are arranged above the sponge and the sleeve. The sleeve is fixed on the turntable surface, the rotating shaft passes through the sleeve, and the outer wall of the sleeve is covered with the sponge; The inflation port is used to fill in protective gas; The sponge is evenly arranged in the lower inner space of the protective cover body, outside the sleeve, and between the wire mesh and the turntable surface; The wire mesh is arranged above the sponge and the sleeve, in three layers; The tin foil partially seals the saddle opening of the protective cover body, forming a semi-sealed space with the protective cover body, and is adjusted according to the actual welding state.

2. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The motor bracket is fixed below the turntable surface and connected to the motor to secure it.

3. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The inner plate is fixed below the turntable surface, and the bearing is embedded in the inner hole to fix the bearing.

4. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The rotating shaft is embedded in the inner hole of the bearing and is fitted into the sleeve at the same height as the sponge. The open end is connected to the motor output shaft, and the stepped end is inserted into the threaded joint end of the corresponding weldment. It rotates together with the motor output shaft during operation.

5. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The turntable cylinder protects the motor, the motor bracket, the inner plate, and the bearing, connects the base and the turntable surface, and fixes the turntable surface.

6. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The turntable surface is fixed on the turntable cylinder, and the inner plate, the motor bracket, and the protective cover body are fixed thereon, connecting the turntable and the protective cover.

7. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The protective cover body is fixed on the turntable surface, and the sponge, the sleeve, and the wire mesh are placed inside to form a semi-sealed space. Inert gas entering through the air inlet flows in the internal space of the protective cover.

8. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The sponge is arranged in the lower space of the protective cover so that the incoming inert protective gas can evenly fill the entire protective cover.

9. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The sleeve is arranged outside the rotating shaft, at the same height as the sponge, and is fixed on the turntable surface to stabilize the rotating shaft and isolate the sponge from the rotating shaft.

10. The welding protection fixture for titanium alloy pipe thread joints according to claim 1, characterized in that, The three layers of wire mesh are arranged on the sponge and the sleeve to prevent the welded parts from contacting the sponge and to avoid the high-temperature threaded joints after welding burning the sponge.

Images