Small thin-wall titanium alloy box body forming process and welding protection device

Abstract

The invention discloses a small thin-wall titanium alloy box body forming process and a welding protection device, and relates to the technical field of titanium alloy box bodies. The titanium alloy middle box comprises a titanium alloy middle box body, a titanium alloy cover plate is arranged at the top of the titanium alloy middle box body, a titanium alloy bottom plate is arranged at the bottom of the titanium alloy middle box body, a connecting flange opening is formed in the top of the titanium alloy cover plate, and a side wall splicing seam is formed in one side of the titanium alloy middle box body; an inner tool is arranged in the titanium alloy middle box body and comprises an inner tool bottom plate, an inner tool cover plate, a C-shaped support, an inner bottom plate M hexagonal head bolt, an inner bottom plate bolt hole, an inner cover plate M hexagonal head bolt, an inner cover plate bolt hole and an inner support bolt hole. According to the titanium alloy forming process, the titanium alloy middle box body is bent and formed, tailor welding forming of four plates is avoided, the number of welding seams is reduced, and the situation that welding deformation is caused by too many welding seams, and the size precision is affected can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy box manufacturing technology, and in particular relates to a forming process and welding protection device for small thin-walled titanium alloy boxes. Background Technology

[0002] Titanium alloys are widely used in aerospace, marine engineering and submarine fields due to their excellent high specific strength, low density, corrosion resistance and good heat resistance and machinability. Especially in structures that require lightweight and high reliability, thin-walled small titanium alloy boxes can effectively achieve the balance between weight reduction and load-bearing capacity, and their application demand is becoming increasingly widespread. However, the thin-walled characteristics combined with the special physicochemical properties of titanium alloys pose a great challenge to their forming and processing technology.

[0003] Existing forming processes for small, thin-walled titanium alloy boxes often involve directly welding six plates together. While this method is suitable for welding medium-thick plates, it is not suitable for small, thin-walled titanium alloy boxes with small wall thicknesses. Due to the numerous weld seams and the low thermal conductivity and elastic modulus of titanium alloys, defects such as welding deformation, weld burn-through, porosity, and poor forming are easily encountered during welding, which seriously affects the forming quality of small, thin-walled titanium alloy boxes.

[0004] To address these issues, we provide a small, thin-walled titanium alloy box forming process and a welding protection device. Summary of the Invention

[0005] The purpose of this invention is to provide a forming process and welding protection device for small thin-walled titanium alloy boxes. By cooperating with internal and external tooling, the problem of low welding quality in the forming process of small thin-walled titanium alloy boxes in the prior art is solved.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0007] This invention relates to a small, thin-walled titanium alloy box welding protection device, comprising a titanium alloy intermediate box, a titanium alloy cover plate at the top of the intermediate box, a titanium alloy base plate at the bottom of the intermediate box, a connecting flange opening at the top of the titanium alloy cover plate, and a side wall seam on one side of the intermediate box; the intermediate box contains internal tooling, including an inner tooling base plate, an inner tooling cover plate, a C-shaped support, M6 hexagonal head bolts on the inner base plate, bolt holes on the inner base plate, M6 hexagonal head bolts on the inner cover plate, bolt holes on the inner cover plate, and bolt holes on the inner support; the intermediate box is also surrounded by external tooling, including an outer tooling base plate, an outer tooling cover plate, an L-shaped support, M6 hexagonal head bolts on the outer base plate, bolt holes on the outer base plate, M6 hexagonal head bolts on the outer cover plate, bolt holes on the outer cover plate, and threaded holes on the outer support.

[0008] The present invention is further configured such that the titanium alloy intermediate box body, the titanium alloy cover plate, and the titanium alloy base plate together constitute the titanium alloy box body, and the length and width dimensions of the titanium alloy base plate and the titanium alloy cover plate are consistent with the length and width dimensions of the outer contour of the titanium alloy intermediate box body.

[0009] The present invention is further configured such that the titanium alloy intermediate box body is formed by bending a titanium alloy sheet, and the side wall seam is formed at the middle position of the side wall when the titanium alloy intermediate box body is bent.

[0010] The present invention is further configured such that C-shaped supports are respectively provided on both sides of the interior of the titanium alloy intermediate box, the inner tooling base plate is provided at the bottom of the C-shaped support, the inner tooling cover plate is provided at the top of the C-shaped support, the inner base plate is provided at the bottom of the inner tooling base plate, and the inner cover plate is provided at the top of the inner tooling cover plate.

[0011] The present invention is further configured such that the inner bottom plate bolt holes are located at the bottom of the inner tooling bottom plate, the inner cover plate bolt holes are located at the top of the inner tooling cover plate, and the inner support bolt holes are located at the corners of both ends of the C-shaped support.

[0012] The present invention is further configured such that the dimensions of the inner bottom plate bolt holes and the inner cover plate bolt holes are adapted to the inner support bolt holes, and the inner bottom plate bolt holes and the inner cover plate bolt holes are respectively arranged in an array at the bottom of the inner tooling bottom plate and the top of the inner tooling cover plate.

[0013] The present invention is further configured such that L-shaped supports are respectively provided at the four corners of the outer perimeter of the titanium alloy intermediate box, the outer tooling base plate is provided at the bottom of the L-shaped support, the outer tooling cover plate is provided at the top of the L-shaped support, the outer base plate M6 hexagonal head bolts are provided at the bottom of the outer tooling base plate, and the outer cover plate M6 hexagonal head bolts are provided at the top of the outer tooling cover plate.

[0014] The present invention is further configured such that the outer bottom plate bolt holes are opened at the bottom of the outer tooling bottom plate, the outer cover plate bolt holes are opened at the top of the outer tooling cover plate, and the outer support threaded holes are opened at the corners of both ends of the L-shaped support.

[0015] The present invention is further configured such that the dimensions of the bolt holes of the outer base plate and the bolt holes of the outer cover plate are adapted to the threaded holes of the outer support, and the bolt holes of the outer base plate and the bolt holes of the outer cover plate are respectively arranged in an array at the bottom of the outer tooling base plate and the top of the outer tooling cover plate.

[0016] A forming process for a small, thin-walled titanium alloy box includes the following steps;

[0017] S1: The titanium alloy sheet is bent into shape using a bending machine, and a side wall joint is reserved in the middle of the side wall to form a titanium alloy intermediate box. The side wall joint of the titanium alloy intermediate box is welded using internal tooling, and the titanium alloy intermediate box, titanium alloy base plate, and titanium alloy cover plate are welded using external tooling.

[0018] S2: Two C-shaped supports are symmetrically placed inside the titanium alloy intermediate box. The inner tooling base plate is connected and fixed to the bottom of the C-shaped support using M6 hexagonal head bolts on the inner bottom plate. The inner tooling cover plate is connected and fixed to the top of the C-shaped support using M6 hexagonal head bolts on the inner cover plate. In this way, the two C-shaped supports provide welding support and prevent deformation of the titanium alloy intermediate box. The inner tooling base plate and inner tooling cover plate provide assembly and fixation for the titanium alloy intermediate box. At this time, the gap between the two C-shaped supports is 4mm, and the side wall joint is located in the middle of the gap between the two C-shaped supports. This can prevent the titanium alloy intermediate box from shrinking and jamming the C-shaped supports when disassembling the internal tooling, making it difficult to remove.

[0019] S3: Connect the external argon gas pipe to the bolt hole of the inner cover plate at the center of the top of the inner tooling cover plate. Use high-temperature tape to seal all the bolt holes of the inner bottom plate and the remaining bolt holes of the inner cover plate at the bottom and top of the inner tooling base plate. Argon gas can then be introduced into the inner tooling for side wall welding. Argon gas ensures a good argon gas protective atmosphere inside the side wall joint during welding, preventing hydrogen, oxygen and nitrogen impurities in the air from affecting the weld quality and the strength of the titanium alloy box.

[0020] S4: After the side wall seam welding is completed, the internal tooling is removed, and the titanium alloy base plate and titanium alloy cover plate are aligned with the titanium alloy intermediate box body respectively. The bolt holes of the outer cover plate, which are connected to the top flange of the outer tooling cover plate and the titanium alloy cover plate, are connected to the argon gas pipe.

[0021] S5: Then, use M6 hexagonal head bolts on the outer base plate to connect and fix the outer tooling base plate to the bottom of the four L-shaped supports, and use M6 hexagonal head bolts on the outer cover plate to connect the outer tooling cover plate to the top of the four L-shaped supports. In this way, the titanium alloy box body composed of the titanium alloy intermediate box body, the titanium alloy cover plate and the titanium alloy base plate is assembled and fixed. Use high temperature tape to seal all the bolt holes of the outer base plate and the remaining bolt holes of the outer cover plate at the bottom of the outer tooling base plate and the top of the outer tooling cover plate.

[0022] S6: Argon gas is introduced and the titanium alloy base plate and titanium alloy cover plate are welded to the titanium alloy intermediate box to ensure that the inside of the titanium alloy box is filled with argon gas during welding, which plays a good role in welding protection. The welding method adopts symmetrical intermittent welding to control welding deformation.

[0023] S7: After welding is completed, the external tooling can be removed, and argon gas can be directly introduced from the connecting flange port on the top of the titanium alloy cover plate to weld the L-shaped support shielding parts on the four corners. At this point, the titanium alloy box body is welded and formed.

[0024] The present invention has the following beneficial effects.

[0025] 1. The present invention uses a titanium alloy forming process to bend and form a titanium alloy intermediate box body, avoiding the need to weld four plates together and reducing the number of welds. On the one hand, this can avoid excessive welds causing welding deformation and affecting dimensional accuracy; on the other hand, reducing the number of welds can avoid welding stress concentration.

[0026] 2. The internal and external tooling provided by this invention provides excellent protection during the welding of titanium alloy boxes. If gas protection is inadequate during welding, titanium alloy boxes are highly susceptible to reaction with impurities such as hydrogen, oxygen, and nitrogen in the air, leading to weld embrittlement, reduced plasticity, and even cracking. This internal and external tooling effectively avoids these problems. Furthermore, the modular design of the internal and external tooling allows for rapid assembly and disassembly, adapting to the welding of thin-walled titanium alloy boxes of different specifications.

[0027] 3. Through the molding process and welding protection device described above, the present invention can achieve standardized manufacturing process. The pass rate of the dimensional inspection of small thin-walled titanium alloy boxes produced in small batches meets the requirements, and the pass rate of the box air pressure strength test and leakage test meets the requirements. It significantly improves production efficiency, ensures product quality, and enables mass production.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0030] Figure 1 This is a schematic diagram of the internal tooling and overall assembly of a small thin-walled titanium alloy box forming process and welding protection device, and the titanium alloy intermediate box.

[0031] Figure 2 This is a schematic diagram of the bending and forming structure of the intermediate titanium alloy box in a small thin-walled titanium alloy box forming process and welding protection device.

[0032] Figure 3 This is an exploded structural diagram of the internal tooling in a small thin-walled titanium alloy box forming process and welding protection device.

[0033] Figure 4This is a schematic diagram of the overall assembly of external tooling and titanium alloy box body in a small thin-walled titanium alloy box body forming process and welding protection device.

[0034] Figure 5 This is an exploded structural diagram of the external tooling in a small thin-walled titanium alloy box forming process and welding protection device.

[0035] In the attached diagram: 1. Titanium alloy intermediate box; 2. Titanium alloy cover plate; 3. Titanium alloy base plate; 4. Connecting flange; 5. Side wall joint; 6. Internal tooling; 61. Internal tooling base plate; 62. Internal tooling cover plate; 63. C-type support; 64. M6 hex head bolts on the inner base plate; 65. Bolt holes on the inner base plate; 66. M6 hex head bolts on the inner cover plate; 67. Bolt holes on the inner cover plate; 68. Bolt holes on the inner support; 7. External tooling; 71. External tooling base plate; 72. External tooling cover plate; 73. L-type support; 74. M6 hex head bolts on the outer base plate; 75. Bolt holes on the outer base plate; 76. M6 hex head bolts on the outer cover plate; 77. Bolt holes on the outer cover plate; 78. Threaded holes on the outer support. Detailed Implementation

[0036] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] Example 1

[0038] Please see Figures 1-5 This invention relates to a forming process and welding protection device for a small, thin-walled titanium alloy box, comprising a titanium alloy intermediate box 1, a titanium alloy cover plate 2 at the top of the titanium alloy intermediate box 1, a titanium alloy base plate 3 at the bottom of the titanium alloy intermediate box 1, a connecting flange 4 at the top of the titanium alloy cover plate 2, and a side wall seam 5 on one side of the titanium alloy intermediate box 1; an internal tooling 6 is provided inside the titanium alloy intermediate box 1, the internal tooling 6 including an internal tooling base plate 61, an internal tooling cover plate 62, and a C-shaped... Support 63, inner bottom plate M6 hexagonal head bolt 64, inner bottom plate bolt hole 65, inner cover plate M6 hexagonal head bolt 66, inner cover plate bolt hole 67, and inner support bolt hole 68; the titanium alloy intermediate box 1 is provided with an external tooling 7, which includes an external tooling base plate 71, an external tooling cover plate 72, an L-shaped support 73, an outer bottom plate M6 hexagonal head bolt 74, an outer bottom plate bolt hole 75, an outer cover plate M6 hexagonal head bolt 76, an outer cover plate bolt hole 77, and an external support threaded hole 78.

[0039] As a preferred embodiment of the above: the inner tooling base plate 61, the inner tooling cover plate 62, the C-shaped support 63, the outer tooling base plate 71, the outer tooling cover plate 72, and the L-shaped support 73 are all made of copper. The inner base plate M6 hexagonal head bolts 64, the inner cover plate M6 hexagonal head bolts 66, the outer cover plate M6 hexagonal head bolts 76, and the outer base plate M6 hexagonal head bolts 74 are all made of titanium alloy. The number of each of the following is four: the inner base plate M6 hexagonal head bolts 64, the inner cover plate M6 hexagonal head bolts 66, the outer cover plate M6 hexagonal head bolts 76, and the outer base plate M6 hexagonal head bolts 74. The titanium alloy intermediate box 1 serves as the main structure of the titanium alloy box and is made of titanium alloy thin plate folded... The bending process reduces the number of welds, minimizes welding deformation and stress concentration, and improves the overall structural consistency and dimensional accuracy. The titanium alloy cover plate 2 seals the top of the titanium alloy box, and the titanium alloy bottom plate 3 seals the bottom of the titanium alloy box. Together with the titanium alloy cover plate and the titanium alloy intermediate box, they form a complete sealing structure, enhancing the overall strength and stability of the titanium alloy box. The connecting flange port 4 is used to introduce protective gas, especially argon gas, which can be directly introduced through this port to complete local repair welding during subsequent welding processes. The side wall joint 5 is the only longitudinal weld formed by bending the titanium alloy thin plate, reducing the number of welds, lowering heat input and deformation risks, and improving welding efficiency and quality.

[0040] Example 2

[0041] Please see Figures 1-5 Based on Example 1, the titanium alloy intermediate box 1, titanium alloy cover plate 2, and titanium alloy base plate 3 together constitute the titanium alloy box body. The length and width dimensions of the titanium alloy base plate 3 and titanium alloy cover plate 2 are consistent with the length and width dimensions of the outer contour of the titanium alloy intermediate box 1. The titanium alloy intermediate box 1 is formed by bending a thin titanium alloy sheet. The side wall seam 5 is formed at the middle position of the side wall when the titanium alloy intermediate box 1 is bent. C-shaped supports 63 are respectively provided on both sides inside the titanium alloy intermediate box 1. The inner tooling base plate 61 is provided at the bottom of the C-shaped support 63, and the inner tooling cover plate 62 is provided at the top of the C-shaped support 63. M6 hexagonal head bolts 64 are located at the bottom of the inner tooling base plate 61, M6 hexagonal head bolts 66 are located at the top of the inner tooling cover plate 62, bolt holes 65 are located at the bottom of the inner tooling base plate 61, bolt holes 67 are located at the top of the inner tooling cover plate 62, and bolt holes 68 are located at the corners of both ends of the C-shaped support 63. The dimensions of the bolt holes 65 and 67 are adapted to the bolt holes 68 of the inner support. The bolt holes 65 and 67 are arranged in an array at the bottom of the inner tooling base plate 61 and the top of the inner tooling cover plate 62, respectively.

[0042] As a preferred embodiment of the above: the internal tooling 6 serves as the base platform for internal support, preventing deformation of the titanium alloy intermediate box during welding. The internal tooling cover plate 62 cooperates with the internal tooling base plate 61 to clamp the C-shaped support 63 and the titanium alloy intermediate box. The C-shaped support 63 provides local rigid support for the side wall joint 5, preventing thin-wall deformation or burn-through during welding. The internal base plate M6 hexagonal head bolts 64 connect the internal tooling base plate 61 and the C-shaped support 63, enabling quick assembly and disassembly. The internal cover plate M6 hexagonal head bolts 66 connect the internal tooling cover plate 62 and the C-shaped support 63, enhancing overall rigidity and facilitating assembly and adjustment. The internal cover plate bolt holes 67 are arranged on the top of the internal tooling cover plate 62. The central hole is used to connect the argon gas pipe, and the remaining holes can be sealed with high-temperature tape to form a local argon gas protection environment. The internal support bolt holes 68 are used to connect with the internal tooling base plate 61 and the internal tooling cover plate 62.

[0043] Example 3

[0044] Please see Figures 1-5 Based on Embodiments 1 and 2, L-shaped supports 73 are respectively provided at the four corners of the outer perimeter of the titanium alloy intermediate box 1. An outer tooling base plate 71 is provided at the bottom of the L-shaped support 73, an outer tooling cover plate 72 is provided at the top of the L-shaped support 73, an outer base plate M6 hexagonal head bolt 74 is provided at the bottom of the outer tooling base plate 71, an outer cover plate M6 hexagonal head bolt 76 is provided at the top of the outer tooling cover plate 72, an outer base plate bolt hole 75 is provided at the bottom of the outer tooling base plate 71, an outer cover plate bolt hole 77 is provided at the top of the outer tooling cover plate 72, and an outer support threaded hole 78 is provided at both corners of the L-shaped support 73. The dimensions of the outer base plate bolt hole 75 and the outer cover plate bolt hole 77 are adapted to the outer support threaded hole 78. The outer base plate bolt hole 75 and the outer cover plate bolt hole 77 are arranged in an array at the bottom of the outer tooling base plate 71 and the top of the outer tooling cover plate 72, respectively.

[0045] As a preferred embodiment of the above, the inner cover bolt holes 67 arrayed on the top of the inner tooling cover plate 62 and the outer cover bolt holes 77 arrayed on the top of the outer tooling cover plate 72 can meet the welding requirements of various box specifications. Furthermore, the dimensions of both the inner cover bolt holes 67 and the outer cover bolt holes 77 are compatible with the external argon gas pipe, facilitating the installation of the argon gas pipe. The outer tooling base plate 71 serves as the foundation for external support, contacting the exterior of the titanium alloy box body via an L-shaped support 73 to provide overall rigidity and prevent welding deformation. The outer tooling cover plate 72 covers the top of the titanium alloy box body and, in conjunction with the outer tooling base plate 71, clamps the titanium alloy box body. The L-shaped support 73 provides external rigid support for the titanium alloy box body, limiting overall deformation during welding. The outer bottom plate M6 hexagonal head bolts 74 connect the outer tooling base plate 71 and the L-shaped support 73, enabling quick assembly and disassembly. The outer cover plate M6 hexagonal head bolts 76 connect the outer tooling cover plate 72 and the L-shaped support 73, enhancing the overall structural stability. The bolt holes 77 of the outer cover plate are arranged on the top of the outer tooling cover plate 72, among which the hole corresponding to the connecting flange port 4 is used to connect the argon gas pipe to achieve overall argon gas protection. The threaded hole 78 of the outer support is used to connect with the outer tooling base plate 7 and the outer tooling cover plate 72.

[0046] The working principle of this invention is as follows: A titanium alloy sheet is bent into shape using a bending machine, and a side wall seam 5 is pre-reserved in the center of the side wall to form a titanium alloy intermediate box 1. The side wall seam 5 of the titanium alloy intermediate box 1 is welded using an internal tooling 6. The titanium alloy intermediate box 1, titanium alloy base plate 3, and titanium alloy cover plate 2 are welded using an external tooling 7. Two C-shaped supports 63 are symmetrically placed inside the titanium alloy intermediate box 1. The inner tooling base plate 61 is connected and fixed to the bottom of the C-shaped supports 63 using M6 hexagonal head bolts 64 on the inner base plate. The inner tooling cover plate 62 is connected and fixed to the top of the C-shaped supports 63 using M6 hexagonal head bolts 66 on the inner cover plate. Thus, the two C-shaped supports 63 provide welding support and prevent deformation of the titanium alloy intermediate box 1. The inner tooling base plate 61 and inner tooling cover plate 62 provide support for the titanium alloy intermediate box 1. Body 1 serves to assemble and fix the components. At this time, the gap between the two C-shaped supports 63 is 4mm, and the side wall joint 5 is located in the middle of the gap between the two C-shaped supports 63. This can prevent the titanium alloy intermediate box body 1 from getting stuck and difficult to remove when disassembling the internal tooling 6 due to welding shrinkage. The external argon gas pipe is threaded to the inner cover plate bolt hole 67 at the center of the top of the inner tooling cover plate 62. High temperature tape is used to seal all the inner bottom plate bolt holes 65 and the remaining inner cover plate bolt holes 67 at the bottom of the inner tooling base plate 61 and the top of the inner tooling cover plate 62. Argon gas can then be introduced into the internal tooling 6 for welding the side wall joint 5. Argon gas is used to ensure a good argon gas protective atmosphere inside the side wall joint 5 during welding, avoiding the impact of hydrogen, oxygen and nitrogen impurities in the air on the weld quality and the strength of the titanium alloy box body.

[0047] After the side wall joint 5 is welded, the internal tooling 6 is removed. The titanium alloy base plate 3 and titanium alloy cover plate 2 are aligned with the titanium alloy intermediate box 1 and placed. The outer cover plate bolt holes 77 on the outer tooling cover plate 72, which are connected to the top flange port 4 of the titanium alloy cover plate 2, are connected to argon gas pipes. Then, the outer tooling base plate 71 is connected and fixed to the bottom of the four L-shaped supports 73 by the M6 ​​hexagonal head bolts 74 on the outer base plate. The outer tooling cover plate 72 is connected to the top of the four L-shaped supports 73 by the M6 ​​hexagonal head bolts 76 on the outer cover plate. In this way, the titanium alloy box 1, composed of the titanium alloy intermediate box 1, titanium alloy cover plate 2, and titanium alloy base plate 3, is assembled and fixed. High-performance equipment is used. Warm adhesive tape is used to seal all the bolt holes 75 of the outer base plate and the remaining bolt holes 77 of the outer cover plate at the bottom of the outer tooling base plate 71 and the top of the outer tooling cover plate 72. Argon gas is then introduced and welded between the titanium alloy base plate 3, the titanium alloy cover plate 2 and the titanium alloy intermediate box 1. This ensures that the inside of the titanium alloy box is filled with argon gas during welding, providing good welding protection. Symmetrical intermittent welding is used to control welding deformation. After welding is completed, the outer tooling 7 can be removed, and argon gas can be introduced directly from the connecting flange port 4 at the top of the titanium alloy cover plate 2 to weld the L-shaped supports 73 at the four corners. At this point, the titanium alloy box is welded and formed.

[0048] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A small, thin-walled titanium alloy box welding protection device, comprising a titanium alloy intermediate box (1), characterized in that: The titanium alloy intermediate box (1) is provided with a titanium alloy cover plate (2) on the top, a titanium alloy bottom plate (3) is provided at the bottom of the titanium alloy intermediate box (1), a connecting flange opening (4) is provided on the top of the titanium alloy cover plate (2), and a side wall joint (5) is provided on one side of the titanium alloy intermediate box (1). The titanium alloy intermediate box (1) is provided with an internal tooling (6), which includes an internal tooling base plate (61), an internal tooling cover plate (62), a C-shaped support (63), an M6 hexagonal head bolt (64) on the inner base plate, an inner base plate bolt hole (65), an M6 hexagonal head bolt (66) on the inner cover plate, an inner cover plate bolt hole (67) and an inner support bolt hole (68). The titanium alloy intermediate box (1) is provided with an external tooling (7), which includes an external tooling base plate (71), an external tooling cover plate (72), an L-shaped support (73), an M6 hexagonal head bolt (74) on the external base plate, an external base plate bolt hole (75), an M6 hexagonal head bolt (76) on the external cover plate, an external cover plate bolt hole (77), and an external support threaded hole (78).

2. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The titanium alloy intermediate box (1), the titanium alloy cover plate (2) and the titanium alloy base plate (3) together form the titanium alloy box. The length and width dimensions of the titanium alloy base plate (3) and the titanium alloy cover plate (2) are consistent with the length and width dimensions of the outer contour of the titanium alloy intermediate box (1).

3. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The titanium alloy intermediate box (1) is formed by bending a titanium alloy sheet, and the side wall joint (5) is formed at the middle position of the side wall when the titanium alloy intermediate box (1) is bent.

4. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The titanium alloy intermediate box (1) is provided with C-shaped supports (63) on both sides inside. The inner tooling base plate (61) is provided at the bottom of the C-shaped support (63), the inner tooling cover plate (62) is provided at the top of the C-shaped support (63), the inner bottom plate M6 hexagonal head bolt (64) is provided at the bottom of the inner tooling base plate (61), and the inner cover plate M6 hexagonal head bolt (66) is provided at the top of the inner tooling cover plate (62).

5. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The inner bottom plate bolt holes (65) are located at the bottom of the inner tooling bottom plate (61), the inner cover plate bolt holes (67) are located at the top of the inner tooling cover plate (62), and the inner support bolt holes (68) are located at the corners of both ends of the C-shaped support (63).

6. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The dimensions of the inner bottom plate bolt holes (65) and the inner cover plate bolt holes (67) are adapted to the inner support bolt holes (68). The inner bottom plate bolt holes (65) and the inner cover plate bolt holes (67) are arranged in an array at the bottom of the inner tooling base plate (61) and the top of the inner tooling cover plate (62), respectively.

7. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The titanium alloy intermediate box (1) is provided with L-shaped supports (73) at the four corners of its exterior. The outer tooling base plate (71) is provided at the bottom of the L-shaped support (73), the outer tooling cover plate (72) is provided at the top of the L-shaped support (73), the outer base plate M6 hexagonal head bolt (74) is provided at the bottom of the outer tooling base plate (71), and the outer cover plate M6 hexagonal head bolt (76) is provided at the top of the outer tooling cover plate (72).

8. The welding protection device for a small thin-walled titanium alloy box according to claim 1, characterized in that: The outer bottom plate bolt holes (75) are located at the bottom of the outer tooling bottom plate (71), the outer cover plate bolt holes (77) are located at the top of the outer tooling cover plate (72), and the outer support threaded holes (78) are located at the corners of both ends of the L-shaped support (73).

9. A small thin-walled titanium alloy box welding protection device according to claim 1, characterized in that: The dimensions of the outer bottom plate bolt holes (75) and the outer cover plate bolt holes (77) are adapted to the outer support threaded holes (78). The outer bottom plate bolt holes (75) and the outer cover plate bolt holes (77) are arranged in an array at the bottom of the outer tooling base plate (71) and the top of the outer tooling cover plate (72), respectively.

10. A forming process for a small, thin-walled titanium alloy box, based on the welding protection device for a small, thin-walled titanium alloy box as described in any one of claims 1-9, characterized in that: Includes the following steps; S1: The titanium alloy sheet is bent into shape using a bending machine, and a side wall joint (5) is reserved in the middle of the side wall to form a titanium alloy intermediate box (1). The side wall joint (5) of the titanium alloy intermediate box (1) is welded using internal tooling (6), and the titanium alloy intermediate box (1), titanium alloy base plate (3), and titanium alloy cover plate (2) are welded using external tooling (7). S2: Place two C-shaped supports (63) symmetrically inside the titanium alloy intermediate box (1). Use M6 hexagonal head bolts (64) on the inner bottom plate to connect and fix the inner tooling base plate (61) to the bottom of the C-shaped support (63). Use M6 hexagonal head bolts (66) on the inner cover plate to connect and fix the inner tooling cover plate (62) to the top of the C-shaped support (63). In this way, the two C-shaped supports (63) can provide welding support and prevent deformation of the titanium alloy intermediate box (1). The inner tooling base plate (61) and the inner tooling cover plate (62) can provide assembly and fixation of the titanium alloy intermediate box (1). At this time, the gap between the two C-shaped supports (63) is 4mm, and the side wall joint (5) is located in the middle of the gap between the two C-shaped supports (63). This can prevent the titanium alloy intermediate box (1) from shrinking and jamming the C-shaped support (63) when disassembling the internal tooling (6), making it difficult to remove. S3: Connect the external argon gas pipe to the inner cover plate bolt hole (67) at the center of the top of the inner tooling cover plate (62) with threads. Use high temperature tape to seal all the inner bottom plate bolt holes (65) and the remaining inner cover plate bolt holes (67) at the bottom of the inner tooling base plate (61) and the top of the inner tooling cover plate (62). Argon gas can then be introduced into the inner tooling (6) for side wall joint (5) welding. Argon gas ensures that there is a good argon gas protective atmosphere inside the side wall joint (5) during side wall joint (5) welding, avoiding the influence of hydrogen, oxygen and nitrogen impurities in the air on weld quality and titanium alloy box strength during welding. S4: After the side wall joint (5) is welded, the internal tooling (6) is removed, and the titanium alloy base plate (3) and titanium alloy cover plate (2) are aligned with the titanium alloy intermediate box (1) respectively. The outer tooling cover plate (72) and the top connecting flange (4) of the titanium alloy cover plate (2) are connected to the argon gas pipe. S5: Then, the outer tooling base plate (71) is connected and fixed to the bottom of the four L-shaped supports (73) by the outer base plate M6 hexagonal head bolts (74), and the outer tooling cover plate (72) is connected to the top of the four L-shaped supports (73) by the outer cover plate M6 hexagonal head bolts (76). In this way, the titanium alloy box body composed of the titanium alloy intermediate box body (1), the titanium alloy cover plate (2) and the titanium alloy base plate (3) is assembled and fixed. High temperature tape is used to seal all the outer base plate bolt holes (75) and the remaining outer cover plate bolt holes (77) at the bottom of the outer tooling base plate (71) and the top of the outer tooling cover plate (72). S6: Argon gas is introduced and the titanium alloy base plate (3) and titanium alloy cover plate (2) are welded to the titanium alloy intermediate box (1) to ensure that the inside of the titanium alloy box is filled with argon gas during welding, which plays a good welding protection role. The welding method adopts symmetrical intermittent welding to control welding deformation. S7: After welding is completed, the external tooling (7) can be removed and argon gas can be introduced directly from the connecting flange port (4) on the top of the titanium alloy cover plate (2) to weld the L-shaped support (73) blocking part on the four corners. At this point, the titanium alloy box body is welded and formed.

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