Soft titanium alloy welding protection cover and welding method

Abstract

The invention relates to the technical field of welding protection devices, and discloses a soft titanium alloy welding protection cover and a welding method.The soft titanium alloy welding protection cover comprises a protection cover body, the protection cover body comprises a top panel, two side panels and an end plate, and the two side panels and the end plate face the welding face of a titanium alloy pipe and are sequentially arranged on the circumferential side wall of the top panel in a surrounding mode; a gas cavity is formed in the top panel, a gas pagoda head is arranged on the top wall of the top panel and communicated with the gas cavity, a screen is arranged on the side, facing the welding face of the titanium alloy pipe, of the top panel and communicated with the gas cavity, a sealing part made of elastic materials is arranged on the side, facing the titanium alloy pipe, of the side panel, and a moving space is formed in the portion, close to the sealing part, of the side panel. The sealing part is inserted into the moving space of the side panel and is in sliding fit with the side panel in the direction towards the titanium alloy pipe, and a driving mechanism is arranged in the side panel and used for driving the sealing part to slide towards the titanium alloy pipe. The titanium alloy pipe welding device has the effect of improving the titanium alloy pipe welding quality and efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of welding protection devices, and in particular to a soft titanium alloy welding protection cover and a welding method. Background Art

[0002] Titanium alloy welding refers to the process of joining titanium alloy materials together through a suitable welding process. Titanium alloy has high strength, good corrosion resistance and high temperature performance, so it is widely used in aviation, aerospace, chemical industry and other fields.

[0003] Titanium and titanium alloys have the characteristics of high specific strength, good corrosion resistance, and a wide operating temperature range, and are widely used in the fields of petrochemicals. However, because titanium alloys are highly chemically active at high temperatures, titanium will react with elements such as hydrogen, oxygen, nitrogen, and carbon in the air during welding. When titanium is welded, it absorbs hydrogen above 250°C, oxygen above 400°C, and nitrogen above 600°C; these elements infiltrating the molten pool will reduce the mechanical properties of the welded joint. Therefore, during welding, the molten pool, weld, and heat-affected zone with a temperature exceeding 400°C must be protected with inert gas to prevent metal oxidation.

[0004] In the prior art, for welding titanium alloy tubes of different diameters, a commonly used welding protection method is to use a rigid protective cover. Although the existing rigid welding protective cover can provide certain protection, it is difficult to adapt to the welding protection needs of titanium alloy tubes with different curvatures due to its rigid structure and poor flexibility, thereby affecting the welding quality and efficiency of the titanium alloy tubes.

[0005] A Chinese patent with announcement number CN221019256U discloses a leak-proof titanium alloy welding gas protection device, including a protective cover body with an opening facing the welding surface of the titanium alloy workpiece, and side sealing parts are arranged on both side ends of the protective cover body through elastic guide supports; when the protective cover body is covered on the welding surface, the side sealing parts are squeezed and deformed by the elastic pressure action of the elastic guide support to fit the shape of the welding surface.

[0006] When the side sealing portion of the above-mentioned welding gas protection device is squeezed and deformed by the elastic pressure action of the elastic guide support to fit the shape of the welding surface, under the restriction of the elastic guide support, the connecting skirt integrally formed with the side sealing portion is deformed and bulged toward the weld. When encountering a titanium alloy tube with a smaller diameter, the curvature of the welding surface increases, thereby causing the deformation bulge of the connecting skirt toward the weld to increase, which is likely to interfere with the normal welding operation of the welding gun, thereby reducing the welding quality and efficiency of the titanium alloy tube. Summary of the invention

[0007] In order to improve the welding quality and efficiency of titanium alloy tubes, the present application provides a soft titanium alloy welding protective cover and a welding method.

[0008] The present application provides a soft titanium alloy welding protective cover and a welding method using the following technical solutions: A soft titanium alloy welding protective cover and welding method, including a protective cover body, the protective cover body including a top panel, two side panels and an end plate, the two side panels and the end plate are all arranged toward the welding surface of the titanium alloy tube, and are sequentially arranged on the peripheral side wall of the top panel, an air cavity is opened inside the top panel, a gas pagoda head is arranged on the top wall of the top panel to connect the air cavity, a screen is arranged on the side of the top panel facing the welding surface of the titanium alloy tube to connect the air cavity, a sealing part of elastic material is arranged on the side of the side panel facing the titanium alloy tube, an active space is opened inside the side panel near the sealing part, the sealing part is inserted in the active space of the side panel, and slides with the side panel in the direction toward the titanium alloy tube, and a driving mechanism is arranged in the side panel to drive the sealing part to slide toward the titanium alloy tube.

[0009] By adopting the above technical solution, when using the protective cover, the protective cover body is attached to the welding surface of the titanium alloy tube, and argon gas is introduced into the air cavity through the gas pagoda head. The argon gas enters the welding area after being dispersed by the screen, providing gas protection for the welding of the titanium alloy tube. At the same time, the driving mechanism drives the titanium alloy tube to slide so that it fits tightly on the welding surface, thereby effectively avoiding the problem of interfering with the normal welding operation of the welding gun and improving the welding quality and efficiency.

[0010] Optionally, an air gathering chamber is provided inside the side panel near the top panel and is connected to the air cavity. A guide groove is provided in the side panel and is connected between the air gathering chamber and the activity space. The driving mechanism includes a piston end block and a guide rod. The piston end block is slidably arranged in the guide groove. The guide rod connects the piston end block and the sealing part. The guide groove and the guide rod are coaxially arranged. When the air pressure in the air gathering chamber is too high, the gas enters the guide groove and pushes the piston end block and the guide rod to slide synchronously toward the activity space, thereby pushing the sealing part to deform until it fits the welding surface of the titanium alloy tube.

[0011] By adopting the above technical solution, due to the small aperture of the screen, when the air flow filled with argon is too large, the pressure inside the air cavity will also increase. In order to prevent the screen from being deformed due to excessive air pressure in the air cavity, excess argon in the air cavity will enter the gas gathering chamber and accumulate in the gas gathering chamber. When the pressure of the argon accumulated in the gas gathering chamber reaches a certain level, the argon in the gas gathering chamber can be dispersed into the guide groove, thereby pushing the piston end block and the guide rod to slide toward the activity space synchronously, thereby causing the sealing part to deform and fit the welding surface of the titanium alloy tube, thereby improving the sealing performance of the protective cover, ensuring the gas protection effect during welding, and improving welding quality and efficiency.

[0012] Optionally, the sealing portion includes a plurality of sealing blocks, which are distributed along the length direction of the side panel, and two adjacent sealing blocks are tightly fitted, and the guide groove and the driving mechanism are arranged corresponding to each sealing block.

[0013] By adopting the above technical scheme, the sealing part is decomposed into a number of sealing blocks distributed along the length direction of the side panel, and two adjacent sealing blocks are tightly fitted, and corresponding guide grooves and driving mechanisms are respectively set for each sealing block, so that the sealing part can better adapt to various curvature changes of the titanium alloy tube welding surface, improve the gas protection effect, and thus enhance the welding quality and efficiency.

[0014] Optionally, the sealing block is provided with an L-shaped hooking protrusion on one side along the length direction of the side panel, and a groove is opened on the other side, the groove is used to plug and cooperate with the hooking protrusion of an adjacent sealing block, and the two adjacent sealing blocks are slidably fitted along the length direction parallel to the guide groove.

[0015] By adopting the above technical solution, the L-shaped hook protrusion on one side of the sealing block is plugged into the groove of the adjacent sealing block, so that multiple sealing blocks can slide along the length direction of the side panel and tightly combine, thereby ensuring that the sealing part can flexibly adapt to the welding surface of the titanium alloy tube of different shapes and improve the gas protection effect. The sliding cooperation between adjacent sealing blocks further enhances the stability and sealing performance of the entire sealing part, effectively improving the welding quality.

[0016] Optionally, each of the side panels includes a side substrate and a side cover plate, the side substrate is connected to the top panel and the end plate, the side cover plate is connected to the substrate by bolts, and after the side substrate avoids the guide groove, the air gathering chamber and the activity space, a sealing gasket is provided on the fitting surface with the side cover plate.

[0017] By adopting the above technical solution, each side panel is designed to include a side substrate and a side cover plate, and the side cover plate is connected by bolts so that the side substrate can be covered. At the same time, a sealing gasket is arranged at a position avoiding the guide groove, the gas gathering chamber and the activity space, thereby ensuring the sealing performance of the side panel after assembly and improving the overall sealing effect of the protective cover. It is not only convenient for replacing and maintaining the worn parts in the protective cover, but also further ensures the quality of inert gas protection during the welding process.

[0018] Optionally, limit strips are provided on the side walls of the side substrate close to the movable space along the sliding path of the sealing block, and the hooking protrusions at both ends of the sealing part in the length direction are sleeved on the corresponding limit strips, and the hooking protrusions are slidably matched with the limit strips.

[0019] By adopting the above technical solution, the limit strip can guide the sealing block to slide along a predetermined path, ensuring that the sealing part fits tightly against the welding surface of the titanium alloy tube, improving the gas protection effect, and preventing the sealing part from shifting or detaching during the sliding process, thereby enhancing the stability and reliability of the welding process.

[0020] Optionally, a fixing plate is provided on the side of the top panel facing away from the end plate, the fixing plate is trumpet-shaped and recessed toward the inside of the protective cover body, a row of exhaust holes is opened on the side wall of the fixing plate near the top along its own length direction, and a plug-in hole is opened at the center of the recessed fixing plate, the plug-in hole is used for inserting the welding rod, and a fastening rubber ring for fastening the welding rod is sleeved on the plug-in hole.

[0021] By adopting the above technical solution, the trumpet-shaped setting of the fixing plate facilitates the quick and accurate insertion of the welding rod, and the setting of the fastening rubber ring can ensure the stability of the welding rod, further improving the stability and reliability of the welding process, and helping to improve the welding quality.

[0022] Optionally, a protective lens is embedded on the end plate to allow the welder to observe the welding rod insertion position and the angle between the welding gun and the titanium alloy tube wall.

[0023] By adopting the above technical solution, the goggles embedded in the end plate can facilitate the welder to clearly observe the insertion position of the welding rod and the angle between the welding gun and the titanium alloy tube wall, ensuring precise operation during the welding process and improving welding quality and efficiency.

[0024] Optionally, a fixed tube for inserting a welding gun is provided on the top wall of the top panel, passing through the air cavity between the gas pagoda head and the end plate, and a layer of high-temperature resistant rubber tube is coaxially fitted on the inner wall of the fixed tube.

[0025] By adopting the above technical solution, a fixed tube that passes through the air cavity between the gas pagoda head and the end plate on the top wall of the top panel can be inserted into the welding gun, and a layer of high-temperature resistant rubber tube is coaxially bonded to the inner wall of the fixed tube, so that the welding gun is more stable when inserted into the fixed tube, reducing the shaking of the welding gun during welding and improving the welding accuracy and quality.

[0026] A welding method for a soft titanium alloy welding protective cover comprises the following specific steps: S1, processing and cleaning the groove and welding rod of titanium alloy tube; S2, perform pipe welding joint assembly in a clean environment; S3, performing positioning welding; S4, fitting the protective cover to the titanium alloy tube, and installing a welding gun and a welding rod; S5, injecting argon gas into the protective cover; S6, observe the color change of welding rod to judge the effect of argon filling replacement and gas protection; S7, after confirming that argon filling replacement and gas protection are qualified, formal welding is carried out; S8, after welding is completed, the molten pool and the high-temperature welding area are kept in the protective cover for a period of time, and the positioning welding points are removed during the welding process.

[0027] By adopting the above technical scheme, the welding method can ensure that the groove and welding rod of the titanium alloy tube are fully processed and cleaned before welding, which is the basic condition for improving the welding quality. Pipeline weld joints are assembled in a clean environment to reduce the possibility of contamination by external impurities. Positioning welding is performed to further ensure welding accuracy. By fitting the soft titanium alloy welding protective cover to the titanium alloy tube and installing the welding gun and welding rod, argon gas is used to provide effective gas protection for the welding process, preventing the titanium alloy from reacting with harmful elements in the air at high temperatures, and improving the mechanical properties of the welded joint. The effect of argon filling replacement and gas protection is judged by observing the color change of the welding rod to ensure the safety and stability of the welding environment. Finally, formal welding is carried out after confirming that argon filling replacement and gas protection are qualified, which significantly improves the welding quality and efficiency. At the same time, after the welding is completed, the molten pool and the high-temperature welding area are kept in the protective cover for a period of time, and the positioning welds are removed during the welding process to ensure that the welding area is not affected by the external environment, further ensuring the quality of welding.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. When using the protective cover, fit the protective cover body on the welding surface of the titanium alloy tube, and introduce argon gas into the gas cavity through the gas pagoda head. The argon gas enters the welding area after being dispersed by the screen, providing gas protection for the welding of the titanium alloy tube. At the same time, the driving mechanism drives the titanium alloy tube to slide, so that it fits tightly on the welding surface, thereby effectively avoiding the problem of interfering with the normal welding operation of the welding gun and improving the welding quality and efficiency; 2. Due to the small aperture of the screen, when the air flow filled with argon is too large, the pressure inside the air cavity will also increase. In order to prevent the screen from being deformed due to excessive air pressure in the air cavity, excessive argon in the air cavity will enter the gas gathering chamber and accumulate in the gas gathering chamber. When the pressure of the argon accumulated in the gas gathering chamber reaches a certain level, the argon in the gas gathering chamber can be dispersed into the guide groove, thereby pushing the piston end block and the guide rod to slide synchronously toward the activity space, thereby deforming the sealing part and fitting it with the welding surface of the titanium alloy tube, improving the sealing performance of the protective cover, ensuring the gas protection effect during welding, and improving the welding quality and efficiency; 3. The sealing part is decomposed into several sealing blocks distributed along the length direction of the side panel. The adjacent sealing blocks are tightly fitted, and the corresponding guide grooves and driving mechanisms are respectively set for each sealing block, so that the sealing part can better adapt to various curvature changes of the titanium alloy tube welding surface, improve the gas protection effect, and thus enhance the welding quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0030] Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the inner cavity structure of the side panel in the embodiment of the present application.

[0032] Description of reference numerals: 1. Protective cover body; 11. Top panel; 111. Air cavity; 112. Fixed tube; 1121. Rubber tube; 12. Side panel; 121. Side substrate; 1211. Sealing gasket; 122. Side cover; 123. Guide groove; 124. Gas gathering chamber; 125. Limiting strip; 13. End plate; 14. Fixed plate; 141. Exhaust hole; 142. Plug hole; 2. Gas dispersion unit; 21. Gas pagoda head; 22. Screen; 3. Sealing part; 31. Sealing block; 311. Hooking protrusion; 312. Groove; 4. Activity space; 5. Driving mechanism; 51. Piston end block; 52. Guide rod; 6. Goggle lens; 7. Fastening rubber ring. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-3 This application is described in further detail.

[0034] The embodiments of the present application disclose a soft titanium alloy welding protective cover and a welding method.

[0035] Reference Figure 1 and Figure 2 A soft titanium alloy welding protective cover and welding method include a protective cover body 1, the protective cover body 1 includes a top panel 11, two side panels 12, an end plate 13 and a fixed plate 14, the two side panels 12, the end plate 13 and the fixed plate 14 are all arranged toward the welding surface of the titanium alloy tube, and are sequentially arranged on the peripheral side wall of the top panel 11. A gas dispersion unit 2 for blowing argon gas toward the welding surface is arranged on the top panel 11. A sealing part 3 made of silicone rubber is arranged on the side of the side panel 12 facing the titanium alloy tube, and an active space 4 is opened inside the side panel 12 near the sealing part 3. The sealing part 3 is inserted into the active space 4 of the side panel 12 and slides with the side panel 12 in the direction toward the titanium alloy tube. A driving mechanism 5 is arranged in the side panel 12 for driving the sealing part 3 to slide toward the titanium alloy tube.

[0036] Reference Figure 1 and Figure 2When the titanium alloy tube is welded and protected by the protective cover body 1, the gas dispersion unit 2 is used to disperse the input argon gas into the protective cover body 1 to provide all-round gas protection for the titanium alloy tube. The driving mechanism 5 drives the sealing part 3 on the side panel 12 to slide toward the titanium alloy tube so that it fits tightly on the welding surface, avoiding the airflow disturbance caused by the poor fit of the protective cover during the welding process.

[0037] Reference Figure 2 The gas dispersion unit 2 includes a gas pagoda head 21 and a screen 22. An air cavity 111 is provided inside the top panel 11. The gas pagoda head 21 is connected to the air cavity 111 and is installed on the top wall of the top panel 11. The screen 22 is connected to the air cavity 111 and is fixedly arranged on the side of the top panel 11 facing the welding surface of the titanium alloy tube. A fixed tube 112 for inserting a welding gun is provided on the top wall of the top panel 11, which is located between the gas pagoda head 21 and the end plate 13 and penetrates the air cavity 111. A layer of high temperature resistant rubber tube 1121 is coaxially fixedly arranged on the inner wall of the fixed tube 112.

[0038] Reference Figure 1 Two side panels 12 are arranged on both sides of the top panel 11 in the width direction, and the side panels 12 are arranged in a door shape, the door-shaped opening of the side panels 12 faces the titanium alloy tube, and the door-shaped legs on both sides of the side panels 12 are chamfered toward the side wall of the sealing part 3, and the chamfers are coated with a polytetrafluoroethylene coating.

[0039] Reference Figure 3 Each side panel 12 includes a side base plate 121 and a side cover plate 122. The side base plate 121 is fixedly connected to the top panel 11 and the end plate 13, and the side cover plate 122 is covered and connected to the side base plate 121 by bolts.

[0040] Reference Figure 3 The elastic material sealing part 3 on the side panel 12 is made of silicone rubber material and has good flexibility and elasticity. The sealing part 3 is divided into several small units - sealing blocks 31. The sealing blocks 31 are distributed along the length direction of the side panel 12. The two adjacent sealing blocks 31 are tightly fitted. A guide groove 123 is provided in the side panel 12 between the gas gathering chamber 124 and the activity space 4. The guide groove 123 and the driving mechanism 5 are provided corresponding to each sealing block 31. An L-shaped hooking protrusion 311 is integrally formed on one side of the sealing block 31, and a corresponding groove 312 is provided on the other side. The groove 312 is plugged into and matched with the hooking protrusion 311 of the adjacent sealing block 31 to achieve sliding fit between the two adjacent sealing blocks 31 along the length direction parallel to the guide groove 123.

[0041] Reference Figure 3A gas gathering chamber 124 is provided inside the side panel 12 near the top panel 11. The volume of the gas gathering chamber 124 is moderate, and it is mainly used to gather part of the gas transferred from the air cavity 111 and distribute it to each driving mechanism 5. The existence of the gas gathering chamber 124 helps to balance the pressure distribution inside the entire system and ensure that the gas can be smoothly transported to where it is needed. A limit strip 125 is fixedly provided on the side wall of the side substrate 121 close to the activity space 4 along the sliding path of the sealing block 31, and the limit strips 125 are continuously arranged along the length direction of the side panel 12. The hooking protrusions 311 located at both ends of the sealing part 3 in the length direction are both sleeved on the corresponding limit strips 125, and the hooking protrusions 311 and the limit strips 125 are slidably matched.

[0042] Reference Figure 3 The driving mechanism 5 includes a piston end block 51 and a guide rod 52. The piston end block 51 is slidably arranged in the guide groove 123. The guide rod 52 is coaxially arranged with the guide groove 123 and connects the corresponding piston end block 51 with the sealing block 31. When the air pressure in the gas gathering chamber 124 is too high, argon gas enters through the guide groove 123, pushing the piston end block 51 and the guide rod 52 to slide synchronously toward the activity space 4, so that the sealing part 3 is deformed to fit the welding surface of the titanium alloy tube.

[0043] Reference Figure 3 In order to improve the air tightness of the guide groove 123 , a sealing gasket 1211 is fixedly provided on the fitting surface of the side cover plate 122 after the side substrate 121 avoids the guide groove 123 , the gas collection chamber 124 and the activity space 4 .

[0044] Reference Figure 2 The end plate 13 is located on one side of the length direction of the top plate 11, and is fixedly arranged on the side wall on the same side of the top plate 11 and the two side plates 12. The end plate 13 is embedded with a goggles 6 for the welder to observe the welding rod insertion position and the angle between the welding gun and the titanium alloy tube wall. The goggles 6 are made of transparent organic glass material with high light transmittance. The goggles 6 are embedded in a frame fixed by an aluminum frame, and the frame is connected to the end plate 13 by screws. This design not only blocks external light interference, but also protects the welder's eyes from arc damage.

[0045] Reference Figure 1 and Figure 2The fixing plate 14 is located on the side of the top panel 11 away from the end panel 13, and is fixedly arranged on the side wall on the same side of the top panel 11 and the two side panels 12. The fixing plate 14 is trumpet-shaped and is recessed toward the inside of the protective cover body 1. A row of exhaust holes 141 is opened on the side wall near the top of the fixing plate 14 along its own length direction. A plug hole 142 is opened at the center of the recessed fixing plate 14. The plug hole 142 is used for inserting the welding rod, and a fastening rubber ring 7 for fastening the welding rod is fixedly sleeved at the plug hole 142. The fastening rubber ring 7 is made of high-temperature resistant silicone rubber material, with an inner diameter slightly smaller than the diameter of the welding rod and an outer diameter of moderate size to ensure that the welding rod is firmly fixed in the designated position.

[0046] Reference Figures 1 to 3 A welding method for a soft titanium alloy welding protective cover comprises the following specific steps: S1, processing and cleaning the groove of the titanium alloy tube, and grinding and cleaning the welding rod with sandpaper; S2, assemble the pipe ends of the titanium alloy pipe. The pipe weld end assembly should be carried out in a clean working environment and avoid contact with iron ions during the entire welding process. All contact points with titanium materials should avoid contact with iron ions; S3, perform tack welding on the titanium alloy tube. The tack welding is strictly carried out according to the formal welding process. The length of the tack weld is 10-15mm, and the tack welding point is determined according to the tube diameter; S4, install and adjust the titanium alloy tube and the protective cover. First, fit the protective cover to the titanium alloy tube, and insert the end of the welding gun into the protective cover from the fixed tube 112, and then insert the welding rod into the protective cover from the plug hole 142. After confirming the current, align the goggles 6 with the welding surface to accurately adjust the positions of the welding gun and the welding rod. S5, exhausting the air in the protective cover, injecting argon gas into the protective cover for a certain period of time, because the density of argon gas is greater than that of air, the air is discharged from the exhaust hole 141, so that the argon gas fills the entire protective cover; S6, test welding of titanium alloy tubes. Before formal welding, after the argon filling and replacement inside and outside the weld is completed, the heated welding rod is extended to the root of the groove before welding to observe the color change of the welding rod to judge the effect of argon filling and replacement and gas protection; S7, after confirming that the quality of argon filling replacement and gas protection meets the qualified requirements, formal welding is carried out; S8, with the assistance of the positioning of the three-axis chuck and the fixed frame in the welding room, the movement of the rod feeder, welding gun and protective cover is completed, so that the welding completion position is located in the protective cover for 1-2 minutes, so that the outer surface of the molten pool and the high-temperature welding area is protected by the drag cover protective cover; and the positioning weld point is cleared during the welding process.

[0047] The implementation principle of a soft titanium alloy welding protective cover and a welding method in the embodiment of the present application is as follows: by placing the soft titanium alloy welding protective cover close to the welding surface of the titanium alloy tube, and using the gas pagoda head 21 to pass argon gas into the air cavity 111, the argon gas enters the welding area after being dispersed by the screen 22, and provides all-round gas protection for the titanium alloy tube. At the same time, the driving mechanism 5 drives the sealing part 3 on the side panel 12 to slide toward the titanium alloy tube, so that it fits tightly on the welding surface, avoiding the airflow disturbance caused by the non-fitting of the protective cover during the welding process. In addition, by rationally designing each component, the characteristics of the entire protective cover being compact in structure, easy to operate, and simple to maintain are ensured. Compared with the prior art, the soft titanium alloy welding protective cover proposed in this embodiment has better adaptability, reliability and economy, and significantly improves the quality and efficiency of titanium alloy tube welding.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A soft titanium alloy welding protective cover, characterized in that: The protective cover body (1) comprises a top panel (11), two side panels (12) and an end panel (13), the two side panels (12) and the end panel (13) are both arranged facing the welding surface of the titanium alloy tube and are sequentially arranged on the peripheral side wall of the top panel (11), an air cavity (111) is opened inside the top panel (11), a gas pagoda head (21) is arranged on the top wall of the top panel (11) and communicates with the air cavity (111), and the top panel (11) faces the side of the welding surface of the titanium alloy tube. The communicating air cavity (111) is provided with a screen (22); a sealing portion (3) made of an elastic material is provided on the side of the side panel (12) facing the titanium alloy tube; an activity space (4) is provided inside the side panel (12) near the sealing portion (3); the sealing portion (3) is inserted into the activity space (4) of the side panel (12) and is slidably matched with the side panel (12) in a direction toward the titanium alloy tube; a driving mechanism (5) is provided inside the side panel (12) for driving the sealing portion (3) to slide toward the titanium alloy tube.

2. The soft titanium alloy welding protective cover according to claim 1, characterized in that: A gas gathering chamber (124) is provided in the side panel (12) near the top panel (11) and connected to the gas cavity (111); a guide groove (123) is provided in the side panel (12) and connected between the gas gathering chamber (124) and the activity space (4); the driving mechanism (5) comprises a piston end block (51) and a guide rod (52); the piston end block (51) is slidably arranged in the guide groove (123); the guide rod (52) connects the piston end block (51) and the sealing portion (3); the guide groove (123) and the guide rod (52) are coaxially arranged; when the gas pressure in the gas gathering chamber (124) is too high, gas enters the guide groove (123) and pushes the piston end block (51) and the guide rod (52) to slide synchronously toward the activity space (4), thereby pushing the sealing portion (3) to deform to fit the welding surface of the titanium alloy tube.

3. A soft titanium alloy welding protective cover according to claim 2, characterized in that: The sealing portion (3) comprises a plurality of sealing blocks (31), the sealing blocks (31) being distributed along the length direction of the side panel (12), two adjacent sealing blocks (31) being tightly fitted, and the guide groove (123) and the driving mechanism (5) being arranged corresponding to each sealing block (31).

4. The soft titanium alloy welding protective cover according to claim 3, characterized in that: The sealing block (31) is provided with an L-shaped hooking protrusion (311) on one side along the length direction of the side panel (12), and a groove (312) is provided on the other side, wherein the groove (312) is used for plugging and matching with the hooking protrusion (311) of an adjacent sealing block (31), and two adjacent sealing blocks (31) are slidably matched along the length direction parallel to the guide groove (123).

5. The soft titanium alloy welding protective cover according to claim 4, characterized in that: Each of the side panels (12) comprises a side base plate (121) and a side cover plate (122); the side base plate (121) is connected to the top panel (11) and the end panel (13); the side cover plate (122) is connected to the base plate by bolts; after the side base plate (121) avoids the guide groove (123), the gas collection chamber (124) and the activity space (4), a sealing gasket (1211) is provided on the contact surface with the side cover plate (122).

6. The soft titanium alloy welding protective cover according to claim 5, characterized in that: Limiting strips (125) are provided on the side walls of the side substrate (121) close to the activity space (4) along the sliding path of the sealing block (31), and hooking protrusions (311) located at both ends of the sealing portion (3) in the length direction are sleeved on the corresponding limiting strips (125), and the hooking protrusions (311) and the limiting strips (125) are slidably matched.

7. The soft titanium alloy welding protective cover according to claim 1, characterized in that: A fixing plate (14) is arranged on the side of the top panel (11) facing away from the end plate (13); the fixing plate (14) is trumpet-shaped and is recessed toward the inside of the protective cover (1); a row of exhaust holes (141) is provided on the side wall of the fixing plate (14) near the top along its length direction; a plug-in hole (142) is provided at the center of the recess of the fixing plate (14); the plug-in hole (142) is used for inserting a welding rod, and a fastening rubber ring (7) for fastening the welding rod is sleeved on the plug-in hole (142).

8. The soft titanium alloy welding protective cover according to claim 1, characterized in that: The end plate (13) is embedded with a protective lens (6) for allowing the welder to observe the welding rod insertion position and the angle between the welding gun and the titanium alloy tube wall.

9. The soft titanium alloy welding protective cover according to claim 1, characterized in that: A fixing tube (112) for inserting a welding gun is provided on the top wall of the top panel (11) and between the gas pagoda head (21) and the end plate (13), penetrating the air cavity (111), and the inner wall of the fixing tube (112) is coaxially bonded with a layer of high temperature resistant rubber tube (1121).

10. A welding method for a soft titanium alloy welding protective cover according to any one of claims 1 to 9, characterized in that: The specific steps include: S1, processing and cleaning the groove and welding rod of titanium alloy tube; S2, perform pipe welding joint assembly in a clean environment; S3, performing positioning welding; S4, fitting the protective cover to the titanium alloy tube, and installing a welding gun and a welding rod; S5, injecting argon gas into the protective cover; S6, observe the color change of welding rod to judge the effect of argon filling replacement and gas protection; S7, after confirming that argon filling replacement and gas protection are qualified, formal welding is carried out; S8, after welding is completed, the molten pool and the high-temperature welding area are kept in the protective cover for a period of time, and the positioning welding points are removed during the welding process.

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