Aircraft engine titanium alloy thin-walled assembly welding device

Abstract

The application provides a kind of aero-engine titanium alloy thin-wall assembly welding device, relating to the field of titanium alloy welding.The aero-engine titanium alloy thin-wall assembly welding device includes a device frame, further includes two upper and lower closed kettle body end cover assemblies and two left and right closed kettle body side wall assemblies in the device frame, and any one of the closed kettle body end cover assembly and the closed kettle body side wall assembly is installed with a linear hydraulic element towards the inner wall side of the device frame, for controlling the two upper and lower closed kettle body end cover assemblies and the two left and right closed kettle body side wall assemblies to separate and close, and a sealed kettle body can be formed after closing.The aero-engine titanium alloy thin-wall assembly welding device can accurately position the shaft center of two thin-wall titanium alloy parts, and high strength and toughness, fatigue resistance of product parts can be realized by using vacuum stress annealing, high-efficiency welding, high-weld quality and strong process stability can be realized.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy welding, specifically to a welding device for thin-walled titanium alloy assemblies for aero-engines. Background Technology

[0002] In various types of aero-engines, there exists a category of thin-walled combustor inner and outer bypass components, which are high-precision thin-walled welded assemblies of titanium alloy. These are typically structures composed of welded titanium alloy tubing, with high positional accuracy requirements for the tube ends relative to the welding reference. Due to the high hardness and springback of titanium alloy parts, correcting welding deformation after welding is practically impossible in engineering practice. Furthermore, thin-walled workpieces are unsuitable for clamping with existing fixtures; using large clamping forces significantly increases the probability of component damage, especially in the precision-critical field of aero-engines. Even minor deformations can lead to difficulties in controlling engine parameters or even failure to meet operational requirements. Traditional laser welding of the inner and outer ring components of the aero-engine combustor combustor suffers from insufficient weld strength and high residual stress. Therefore, a composite welding equipment is urgently needed to achieve high-strength, fatigue-resistant, low-stress, and low-deformation welding of these components, thereby improving production efficiency and product quality in this process. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a welding device for thin-walled titanium alloy assemblies for aero-engines, which solves the problems mentioned in the background section.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a welding device for titanium alloy thin-walled assemblies for aero-engines, including an equipment frame, and further including two upper and lower closed vessel end cap assemblies and two left and right closed vessel side wall assemblies disposed in the equipment frame. A linear hydraulic element is installed on the side of any one of the closed vessel end cap assemblies and the closed vessel side wall assemblies facing the inner wall of the equipment frame, for controlling the separation and closing of the two upper and lower closed vessel end cap assemblies and the two left and right closed vessel side wall assemblies, and forming a sealed vessel after closing;

[0005] It also includes wire positioning components, which are set in multiple layers in any closed vessel sidewall component. The wire positioning components in the same layer in two closed vessel sidewall components form a cross structure for tightening and positioning titanium alloy welded parts.

[0006] The closed vessel end cap assembly is equipped with a multi-stage telescopic robotic arm and a side-axis coupling welding assembly on one side of the closed vessel side wall assembly. The upper and lower sets of side-axis coupling welding assemblies are staggered and extend to the middle of the multi-layer steel wire positioning assembly, which are used to perform welding work on the weld seams of the titanium alloy weldment.

[0007] Preferably, the closed vessel sidewall assembly includes an inner shell, an outer shell, a sealing ring, and a heat insulation component. The outer shell is fixedly covering the outside of the inner shell. The sealing ring is a semi-ring structure, and two sealing rings are provided, which are respectively fixed to the upper and lower ends of the outer shell. The heat insulation component is fixed on the inner wall of the outer shell and extends into the inner wall of the inner shell.

[0008] The output end of the linear hydraulic element is fixed to the outer wall of the housing.

[0009] Preferably, the wire positioning assembly includes a slip ring, a wire pulling machine, a screw drive assembly, and a surrounding wire. The slip ring is fitted against the inner wall of the inner shell, and a sliding rod is fixedly installed in the inner wall of the inner shell. The sliding rod passes through the slip ring to restrict the slip ring to slide only up and down. The screw drive assembly is fixedly installed between the inner shell and the outer shell, and its output end is used to drive the slip ring to move up and down along the inner wall of the inner shell. There are two wire pulling machines, which are fixedly installed on the inner wall of the slip ring. The included angle between two adjacent wire pulling machines is 90 degrees. One end of the surrounding wire is installed in the wire pulling machine, and the other end is equipped with a limiting component. The limiting component is fitted on the surrounding wire, so that the end away from the wire pulling machine forms a ring structure. When the wire pulling machine tightens the surrounding wire, it can reduce the inner diameter of the surrounding ring structure.

[0010] Preferably, the limiting component includes a connector, a backstop, and a pulley. The connector is fixedly installed at the end of the winding steel wire away from the drawing machine, and the pulley is installed at the end of the connector away from the winding steel wire. The winding steel wire passes through the connector and is transmitted through the pulley. One end of the backstop is hinged in the connector, and the other end can abut against the winding steel wire.

[0011] Preferably, the heat insulation component includes a closed shell and a heating wire. The side of the closed shell located in the inner shell has an arc-shaped structure and has an array of distributed heat radiation holes. The heating wire is installed in the closed shell.

[0012] Preferably, the sealed vessel end cap assembly includes an end cap, the side of the end cap facing the sealing ring is provided with a stepped structure for cooperating with the sealing ring to achieve sealing, and a vacuuming assembly is installed on the upper end cap;

[0013] The output end of the linear hydraulic element is fixedly connected to the outer end of the end cap.

[0014] Preferably, the multi-stage telescopic robotic arm includes a robotic arm and multi-stage telescopic rods, with the robotic arm mounted on the inner wall of the end cap and the multi-stage telescopic rods mounted on the end of the robotic arm.

[0015] Preferably, the off-axis coupling welding assembly includes a TIG welder, a laser, and a servo folding assembly. The laser is installed on one side of the TIG welder, with the laser spot aligned with the welding arc point. The TIG welder is installed in the servo folding assembly, which is installed at the end of a multi-stage telescopic rod. The multi-stage telescopic rod, in conjunction with the servo folding assembly, can deliver the TIG welder to the weld seam and also retract the TIG welder into the end cap.

[0016] Preferably, each of the outer shells is equipped with a positioning component at its end, and the limiting component is used to achieve precise sealing after the two outer shells are closed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This welding device for thin-walled titanium alloy components of aero-engines utilizes a wire positioning assembly. Since most thin-walled titanium alloy combustion chamber components are cylindrical and vary in shape, a cross-shaped network of surrounding wires can simultaneously connect one position of the titanium alloy component. Multiple layers of wire positioning assemblies can simultaneously fix different positions of the workpiece. After being tightened by a wire-pulling machine, they can be used to fix the welding components. The wire-pulling machine can be used for axial positioning of the workpiece, precisely positioning the axial centers of two thin-walled titanium alloy components. A lead screw transmission component can also precisely adjust the weld height, thus enabling precise docking of thin-walled workpieces. Furthermore, the binding diameter of the wire rope can be changed at any time, thus accommodating various specifications of thin-walled combustion chamber flame tube components or other thin-walled titanium alloy workpieces.

[0019] 2. The welding device for titanium alloy thin-walled components of aero-engines, by setting up a closed vessel end cap assembly and a closed vessel side wall assembly, can form a closed vessel after the four components are put together. The titanium alloy thin-walled workpiece can be kept in vacuum during welding, and after welding, the heat preservation assembly can heat the vacuum environment and maintain a certain temperature. Through heating, the atomic activity is enhanced, and plastic flow occurs in the area where the yield strength of the material decreases, thereby relaxing and redistributing the residual stress. Vacuum stress annealing can achieve high strength, toughness and fatigue resistance of the product parts.

[0020] 3. The welding device for titanium alloy thin-walled components of aero-engines is equipped with multi-stage telescopic robotic arms and off-axis coupling welding components. After the vessel body is closed, the multi-stage telescopic robotic arms can move the off-axis coupling welding components to the weld seam. When not welding, they can be retracted. The off-axis coupling welding components are laser + TIG welders, which can achieve high-efficiency welding, high weld quality, and strong process stability.

[0021] 4. The welding device for the titanium alloy thin-walled assembly of the aero-engine, the TIG welder is also equipped with a protective gas, which can be used for atmosphere protection in non-vacuum environments, and can also be used for stress release in vacuum environments by using inert gas to balance the temperature between the weld and the reactor body. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the structure of the present invention;

[0024] Figure 3 This is a connection diagram of the sealed vessel sidewall assembly and the sealed vessel end cap assembly of the present invention;

[0025] Figure 4 This is a cross-sectional view of the closed vessel sidewall assembly and the closed vessel end cap assembly of the present invention;

[0026] Figure 5 This is a separation diagram of the closed vessel sidewall assembly and the closed vessel end cap assembly of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the sealed vessel sidewall assembly of the present invention;

[0028] Figure 7 This is a structural cross-sectional view of the closed vessel sidewall assembly of the present invention;

[0029] Figure 8 This is a structural diagram of the combined structure of the two enclosed vessel sidewall components of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the multi-stage telescopic robotic arm and the off-axis coupling welding assembly of the present invention;

[0031] Figure 10 For the present invention Figure 9 Enlarged view of the structure at point A in the middle;

[0032] Figure 11 This is a schematic diagram showing the connection between the wire positioning component and the inner shell of the present invention;

[0033] Figure 12 This is a schematic diagram of the steel wire positioning assembly of the present invention;

[0034] Figure 13 For the present invention Figure 12 Enlarged view of the structure at point B in the image.

[0035] In the diagram: 1. Equipment frame; 2. Sealed vessel end cap assembly; 201. End cap; 202. Vacuuming assembly; 3. Sealed vessel side wall assembly; 301. Inner shell; 302. Outer shell; 303. Sealing ring; 304. Insulation assembly; 3041. Sealed shell; 3042. Heating wire; 3043. Heat radiation hole; 4. Linear hydraulic component; 5. Wire positioning assembly; 501. Slip ring; 502. Wire drawing machine; 503. Screw drive assembly; 504. Circulating wire; 505. Slide rod; 506. Limiting component; 5061. Connector; 5062. Backstop; 5063. Pulley; 6. Multi-stage telescopic robotic arm; 601. Robotic arm; 602. Multi-stage telescopic rod; 7. Off-axis coupling welding assembly; 701. TIG welder; 702. Laser; 703. Servo folding assembly. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0040] like Figure 1-13 As shown, a welding device for thin-walled titanium alloy components for aero-engines includes a frame 1, and two upper and lower sealed vessel end cap assemblies 2 and two left and right sealed vessel side wall assemblies 3 disposed within the frame 1. A linear hydraulic element 4 is installed on the side of any one of the sealed vessel end cap assemblies 2 and the left and right sealed vessel side wall assemblies 3 facing the inner wall of the frame 1. This element controls the separation and closing of the two sealed vessel end cap assemblies 2 and the left and right sealed vessel side wall assemblies 3, forming a sealed vessel after closing. The device also includes wire positioning components 5, which are arranged in multiple layers within any one of the sealed vessel side wall assemblies 3. The wire positioning components 5 distributed in the same layer of two sealed vessel side wall assemblies 3 form a cross structure for tightening and positioning the titanium alloy welded parts. The closed vessel end cap assembly 2 is equipped with a multi-stage telescopic robotic arm 6 and a side-axis coupling welding assembly 7 on one side of the closed vessel side wall assembly 3. The upper and lower sets of side-axis coupling welding assemblies 7 are staggered and extend to the middle of the multi-layer steel wire positioning assembly 5, which are used to perform welding work on the weld seam of the titanium alloy welded parts.

[0041] Equipment frame 1 is a support component made of metal steel beams and is used to fix the entire vessel body. Equipment frame 1 can be fixed on the workshop floor or connected with other support equipment. Linear hydraulic component 4 includes hydraulic cylinder and linear motion component. The linear motion component includes components such as crossbar, which can ensure that it is always in a linear motion state when subjected to force. Hydraulic cylinder is used to output linear motion.

[0042] The wire positioning assembly 5 is generally divided into two groups, which are used to fix two parts to be welded. Each group of wire positioning assemblies 5 contains at least two, which can be used to fix the two ends of the workpiece. For longer cylindrical parts, additional wire positioning assemblies 5 can be added to avoid positional deviation during fixing.

[0043] In an optional embodiment, the sealed vessel sidewall assembly 3 includes an inner shell 301, an outer shell 302, a sealing ring 303, and a heat insulation assembly 304. The outer shell 302 is fixedly covering the outside of the inner shell 301. The sealing ring 303 has a semi-ring structure, and two sealing rings 303 are provided, which are respectively fixed to the upper and lower ends of the outer shell 302. The heat insulation assembly 304 is fixed on the inner wall of the outer shell 302 and extends into the inner wall of the inner shell 301. The output end of the linear hydraulic element 4 is fixed to the outer wall of the outer shell 302.

[0044] In this embodiment, both the inner shell 301 and the outer shell 302 are semi-circular arc structures. Triangular reinforcing ribs are provided on a portion of the inner wall of the outer shell 302 to connect the inner shell 301 and increase the strength between the outer shell 302 and the inner shell 301. Especially in a vacuum environment, this can better ensure the stability of the equipment vessel.

[0045] The sealing ring 303 is a special-shaped part, which can be fitted with a high-temperature resistant gasket to ensure a seal.

[0046] The insulation component 304 includes an electrical system and a control module for precise control of internal heating and linear cooling.

[0047] In an optional embodiment, the wire positioning assembly 5 includes a slip ring 501, a wire drawing mechanism 502, a screw drive assembly 503, and a surrounding wire 504. The slip ring 501 is fitted against the inner wall of the inner shell 301. A slide rod 505 is fixedly installed in the inner wall of the inner shell 301, and the slide rod 505 passes through the slip ring 501 to restrict the slip ring 501 to slide only up and down. The screw drive assembly 503 is fixedly installed between the inner shell 301 and the outer shell 302, and its output end is used to drive the slip ring 501 along the inner shell 301. The inner wall moves up and down. There are two wire pulling machines 502. The wire pulling machines 502 are fixedly installed on the inner wall of the slip ring 501. The included angle between two adjacent wire pulling machines 502 is 90 degrees. One end of the winding steel wire 504 is installed in the wire pulling machine 502, and the other end is installed with a limiting member 506. The limiting member 506 is sleeved on the winding steel wire 504, so that the end away from the wire pulling machine 502 forms a ring structure. When the wire pulling machine 502 pulls the winding steel wire 504, it can make the inner diameter of the ring structure smaller.

[0048] In this embodiment, the surrounding steel wire 504 can be wrapped around the outside of the workpiece, especially thin-walled workpieces. After the steel wire rope is wrapped around, it can not only fix the workpiece, but also prevent the workpiece from being damaged by clamping. In particular, existing fixing fixtures only set a small clamping force to prevent thin-walled workpieces from being damaged by clamping, which has extremely unstable factors during the later welding process.

[0049] A threaded sleeve is installed on the slip ring 501, which passes through the inner shell 301. The lead screw transmission assembly 503 includes a servo motor and a lead screw. The lead screw passes through the threaded sleeve and is connected to it for transmission. When the servo motor rotates, it can control the slip ring 501 to move up and down in the inner shell 301, and the movement distance is relatively accurate.

[0050] The wire drawing machine 502 is also equipped with a servo motor and a worm gear winding wheel. The end of the winding wire 504 is connected to the winding wheel. When the servo motor rotates, it can apply a large pulling force to pull the winding wire 504. The tighter it is pulled, the smaller the diameter of the winding ring becomes.

[0051] In an optional embodiment, the limiting member 506 includes a connector 5061, a stopper 5062, and a pulley 5063. The connector 5061 is fixedly installed at the end of the winding wire 504 away from the wire drawing machine 502. The pulley 5063 is installed at the end of the connector 5061 away from the winding wire 504. The winding wire 504 passes through the connector 5061 and is transmitted through the pulley 5063. One end of the stopper 5062 is hinged in the connector 5061, and the other end can abut against the winding wire 504.

[0052] In this embodiment, the winding steel wire 504 makes a loop after passing through the connector 5061. The anti-reverse device 5062 is provided with a handle. After the workpiece is tightened, the winding steel wire 504 pulls the anti-reverse device 5062 against the winding steel wire 504 to prevent it from retracting and loosening. When loosening, the anti-reverse device 5062 needs to be manually pulled open. Both the anti-reverse device 5062 and the connector 5061 are provided with toothed grooves to increase friction.

[0053] In an optional embodiment, the heat insulation component 304 includes a closed housing 3041 and a heating wire 3042. The side of the closed housing 3041 located in the inner housing 301 has an arc-shaped structure and an array of distributed heat radiation holes 3043. The heating wire 3042 is installed in the closed housing 3041.

[0054] In this embodiment, the heating wire 3042 generates heat through electric heating. The heating temperature, holding time, and linear cooling are precisely controlled by the control module. The radiant heat holes can evenly distribute heat, avoiding excessive local heat concentration that could damage the titanium alloy components.

[0055] In an optional embodiment, the sealed vessel end cap assembly 2 includes an end cap 201. The side of the end cap 201 facing the sealing ring 303 is designed with a stepped structure to cooperate with the sealing ring 303 to achieve a seal. A vacuum assembly 202 is mounted on the upper end cap 201. The output end of the linear hydraulic element 4 is fixedly connected to the outer end of the end cap 201.

[0056] In this embodiment, the stepped structure of the end cap 201 is designed to cooperate with the sealing ring 303, which can ensure a certain degree of sealing after compression. The vacuum assembly 202 includes a vacuum tube and a negative pressure vacuum component.

[0057] In an optional embodiment, the multi-stage telescopic robotic arm 6 includes a robotic arm 601 and a multi-stage telescopic rod 602. The robotic arm 601 is mounted on the inner wall of the end cap 201, and the multi-stage telescopic rod 602 is mounted on the end of the robotic arm 601.

[0058] In this embodiment, the robotic arm 601 adopts an existing micro multi-axis robotic arm, and the multi-stage telescopic rod 602 uses hydraulic drive to control its extension and retraction.

[0059] In an optional embodiment, the off-axis coupled welding assembly 7 includes a TIG welder 701, a laser 702, and a servo folding assembly 703. The laser 702 is mounted on one side of the TIG welder 701, with the laser spot aligned with the welding arc point. The TIG welder 701 is mounted in the servo folding assembly 703, which is mounted at the end of the multi-stage telescopic rod 602. The multi-stage telescopic rod 602, in conjunction with the servo folding assembly 703, can deliver the TIG welder 701 to the weld seam and can also retract the TIG welder 701 into the end cover 201.

[0060] In this embodiment, during TIG welding, the electric arc burns between a non-consumable tungsten electrode and the workpiece. An inert gas (such as argon, helium, or a mixture thereof) continuously flows from the nozzle of the welding torch, forming a protective gas shield that isolates the electric arc, the molten weld pool, the high-temperature tungsten electrode, and the welding wire from oxygen, nitrogen, and other gases in the air, thereby obtaining a high-quality, oxidation-free, pure weld. The TIG welding machine 701 includes a gas outlet, and a laser 702 is mounted on one side of it, with their output points coinciding. The laser stabilizes the arc, especially at low currents or high welding speeds, making the arc less prone to drift and resulting in more stable combustion.

[0061] In an optional embodiment, positioning elements are installed at the ends of the housings 302, and the limiting elements are used to achieve precise fitting after the two housings 302 are closed.

[0062] In use, first separate the two closed vessel end cap assemblies 2, then separate the two closed vessel side wall assemblies 3. Pass the two titanium alloy parts to be welded through the surrounding steel wire 504. Each workpiece is fixed by at least two layers of steel wire positioning assemblies 5. After the titanium alloy parts pass through the surrounding steel wire 504, the wire pulling machine 502 is used to gather the surrounding steel wire 504. At this time, the surrounding steel wire 504 can be tied to the outside of the workpiece. The four surrounding steel wires 504 in each layer can pull the workpiece in four directions. The limiting part 506 can restrict the steel wire, so that the steel wire is close to the surface of the workpiece. The four wire pulling machines 502 in one layer can adjust the position of the workpiece axis by fine adjustment. The control screw transmission assembly 503 can finely adjust the position of the surrounding steel wire 504 up and down to adapt to irregularly shaped workpieces or workpieces of different lengths.

[0063] After the workpiece is fixed, first close the two closed vessel side wall components 3, then close the two closed vessel end cap components 2, thus forming a closed space. The vacuum assembly 202 can be used to evacuate the closed space. During the vacuuming process, the TIG welding machine 701 is used to fill the closed space with inert protective gas, thereby squeezing out the oxygen-containing gas until the closed space is free of any oxygen or other impurity gases.

[0064] Welding can be performed using a multi-stage robotic arm 601 and a side-axis coupled welding assembly 7. Due to the presence of two welding assemblies, each assembly can cover only 180 degrees of the workpiece. Bidirectional welding can achieve double the welding speed. During the welding process, the workpiece is preheated by an electric arc, which improves the material's absorption rate of the laser, allowing the laser to more effectively produce the "keyhole effect." The penetration depth is greater than that of simple laser welding or electric arc welding, and the weld surface is smooth and flat, without defects such as undercut. After welding, the heat preservation assembly 304 is used to heat the enclosed space. During the heating process, the gas protection assembly of the TIG welding machine 701 can be used to inject an atmosphere into the enclosed space for protection. The inert gas can quickly balance the temperature inside the enclosed space, ensuring that the weld point is kept at a suitable temperature for a certain period of time. The heat preservation time depends on the thickness of the welding material, and the heat preservation assembly 304 gradually lowers the temperature over time, keeping the welding position at a constant rate of cooling.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0066] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding apparatus for thin-walled titanium alloy assemblies for aero-engines, comprising an equipment frame (1), characterized in that: It also includes two upper and lower closed vessel end cap assemblies (2) and two left and right closed vessel side wall assemblies (3) installed in the equipment frame (1). A linear hydraulic element (4) is installed on the side of any closed vessel end cap assembly (2) and closed vessel side wall assembly (3) facing the inner wall of the equipment frame (1) to control the separation and closing of the two upper and lower closed vessel end cap assemblies (2) and the two left and right closed vessel side wall assemblies (3), and after closing, a sealed vessel can be formed. It also includes a wire positioning component (5), which is set to be multi-layered in any one of the closed vessel sidewall components (3). The wire positioning components (5) distributed in the same layer in two closed vessel sidewall components (3) form a cross structure for tightening and positioning titanium alloy welded parts. The closed vessel end cap assembly (2) is equipped with a multi-stage telescopic robotic arm (6) and a side-axis coupling welding assembly (7) on one side of the closed vessel side wall assembly (3). The upper and lower sets of side-axis coupling welding assemblies (7) are staggered and extend to the middle of the multi-layer steel wire positioning assembly (5) for welding the weld seam of the titanium alloy weldment. The closed vessel sidewall assembly (3) includes an inner shell (301), an outer shell (302), a sealing ring (303), and a heat insulation assembly (304). The outer shell (302) is fixedly covered outside the inner shell (301). The sealing ring (303) is a semi-ring structure. There are two sealing rings (303), which are fixed to the upper and lower ends of the outer shell (302) respectively. The heat insulation assembly (304) is fixed on the inner wall of the outer shell (302) and extends into the inner wall of the inner shell (301). The output end of the linear hydraulic element (4) is fixed to the outer wall of the housing (302); The wire positioning assembly (5) includes a slip ring (501), a wire drawing machine (502), a screw drive assembly (503), and a surrounding wire (504). The slip ring (501) is attached to the inner wall of the inner shell (301). A slide rod (505) is fixedly installed in the inner wall of the inner shell (301). The slide rod (505) passes through the slip ring (501) to limit the slip ring (501) so that it can only slide up and down. The screw drive assembly (503) is fixedly installed between the inner shell (301) and the outer shell (302). Its output end is used to drive the slip ring (501) along the inner shell (301). The inner wall moves up and down. There are two wire pulling machines (502). The wire pulling machines (502) are fixedly installed on the inner wall of the slip ring (501). The included angle between two adjacent wire pulling machines (502) is 90 degrees. One end of the winding steel wire (504) is installed in the wire pulling machine (502), and the other end is installed with a limiting part (506). The limiting part (506) is sleeved on the winding steel wire (504), so that the end away from the wire pulling machine (502) forms a ring structure. When the wire pulling machine (502) tightens the winding steel wire (504), it can make the inner diameter of the ring structure smaller. The limiting member (506) includes a connector (5061), a stopper (5062), and a pulley (5063). The connector (5061) is fixedly installed at the end of the winding wire (504) away from the wire drawing machine (502). The pulley (5063) is installed at the end of the connector (5061) away from the winding wire (504). The winding wire (504) passes through the connector (5061) and is transmitted through the pulley (5063). One end of the stopper (5062) is hinged in the connector (5061), and the other end can abut against the winding wire (504).

2. The welding apparatus for thin-walled titanium alloy assemblies for aero-engines according to claim 1, characterized in that: The heat insulation component (304) includes a closed shell (3041) and a heating wire (3042). The closed shell (3041) has an arc-shaped structure on one side within the inner shell (301), and this side has an array of distributed heat radiation holes (3043). The heating wire (3042) is installed in the closed shell (3041).

3. The welding apparatus for thin-walled titanium alloy assemblies for aero-engines according to claim 2, characterized in that: The closed vessel end cap assembly (2) includes an end cap (201). The side of the end cap (201) facing the sealing ring (303) is set as a stepped structure to cooperate with the sealing ring (303) to achieve sealing. A vacuum assembly (202) is installed on the upper end cap (201). The output end of the linear hydraulic element (4) is fixedly connected to the outer end of the end cap (201).

4. The welding apparatus for thin-walled titanium alloy assemblies for aero-engines according to claim 3, characterized in that: The multi-stage telescopic robotic arm (6) includes a robotic arm (601) and a multi-stage telescopic rod (602). The robotic arm (601) is mounted on the inner wall of the end cap (201), and the multi-stage telescopic rod (602) is mounted on the end of the robotic arm (601).

5. The welding apparatus for thin-walled titanium alloy assemblies for aero-engines according to claim 4, characterized in that: The off-axis coupling welding assembly (7) includes a TIG welder (701), a laser (702), and a servo folding assembly (703). The laser (702) is installed on one side of the TIG welder (701), with the laser point aligned with the welding arc point. The TIG welder (701) is installed in the servo folding assembly (703), which is installed at the end of the multi-stage telescopic rod (602). The multi-stage telescopic rod (602) in conjunction with the servo folding assembly (703) can deliver the TIG welder (701) to the weld seam and can also retract the TIG welder (701) into the end cap (201).

6. The welding apparatus for thin-walled titanium alloy assemblies for aero-engines according to claim 5, characterized in that: Positioning components are installed at the ends of the outer shells (302). After the two outer shells (302) are closed, the limiting components are used to achieve precise sealing.

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