Preparation method of titanium alloy box

Abstract

The invention discloses a preparation method of a titanium alloy box body, which comprises the following steps: preparing a bottom plate and grid ribs, assembling to form a bottom plate assembly, welding crossed fillet parts, carrying out laser welding segmented positioning, continuously welding external and internal grid rings, and sequentially assembling side wall plates and a bearing plate to form a main bearing structure. Welding the root of the intersection of the three faces and the upper end face of the butt joint, then positioning two sides of an inner butt welding seam and an outer butt welding seam of the main force bearing structure in a segmented mode and then continuously welding, finally assembling a supporting ring, a panel and a reinforcing plate assembly to form a box body, and completing positioning welding, continuous welding, sleeking and surface cleaning of all the welding seams; the forming requirement of a large box body is met, high forming precision and high stability are guaranteed, and the problem that the component forming requirement cannot be met in integral casting, forging and material increasing schemes is effectively solved.

Description

Technical Field

[0001] This application relates to the field of laser welding technology, and in particular to a method for preparing a titanium alloy box. Background Technology

[0002] In precision laser systems, the housing serves as the core assembly carrier, and its performance directly affects the operational accuracy and stability of the entire system. Therefore, extremely high requirements are placed on the dimensional accuracy, geometric tolerances, structural strength, stiffness stability, and thermal stability of the structure.

[0003] For large titanium alloy box components, their external dimensions reach three meters, their internal cavity structure is complex, and the precision requirements of key parts such as installation benchmarks and positioning bosses are as high as micrometer level. At the same time, there are also high standards for overall rigidity, dimensional stability and surface cleanliness. It belongs to the typical category of high strength, high precision and high cleanliness manufacturing.

[0004] However, existing forming schemes for such large and complex titanium alloy boxes have many limitations. When using an integral casting scheme, the size of the casting equipment and hot isostatic pressing equipment makes it difficult to meet the forming requirements of three-meter-class large components. Furthermore, the surface roughness of the castings is poor, and the complex internal surface of the internal cavity is extremely difficult to process, making it impossible to achieve the high precision and high cleanliness requirements of the box.

[0005] The integral forging solution faces challenges due to the complexity of the product structure, making it difficult to achieve precise component forming through forging processes and failing to meet the manufacturing requirements of complex cavities and high-precision features in the enclosure. The integral additive manufacturing solution also faces bottlenecks. On one hand, the size limitations of the forming equipment make it difficult to handle large enclosures in the three-meter range; on the other hand, for enclosed structures with extremely high internal precision requirements, it is difficult to guarantee forming accuracy during additive manufacturing, thus failing to meet the high-precision manufacturing standards for the enclosure. Summary of the Invention

[0006] In view of the defects in the prior art, this application provides a method for preparing a titanium alloy box to solve the problems of high difficulty and low reliability in preparing complex cavities in the prior art.

[0007] The above-mentioned objectives of this application are mainly achieved through the following technical solutions:

[0008] A method for preparing a titanium alloy housing, the method comprising:

[0009] Prepare a base plate and a grid reinforcement, assemble them to form a base plate assembly, and weld the rounded corners where the base plate and the grid reinforcement intersect.

[0010] After laser welding segmentation and positioning of the external butt joint of the base plate assembly, laser continuous welding is performed on the external weld and internal mesh ring of the base plate and the mesh reinforcement.

[0011] Prepare side wall panels and load-bearing plates, and assemble them with the base plate assembly to form the main load-bearing structure. Weld the three intersecting roots of the side wall panels, the load-bearing plates, and the base plate assembly.

[0012] Weld the upper end face of the joint between the side wall panel and the load-bearing plate;

[0013] After laser welding segmentation and positioning of the butt welds on both sides of the external and internal main load-bearing structure, continuous laser welding is continued.

[0014] Prepare the support ring, panel and reinforcing plate assembly, and assemble them with the main load-bearing structure to form a box body. Position and weld the end faces of each weld joint of the assembly parts of the box body.

[0015] After laser welding segmentation and positioning on both sides of the external and internal butt welds of the box body, continuous laser welding is continued.

[0016] After all the internal and external welds of the box body are fully welded, the surface of the welds is polished and the surface of the box body is cleaned to complete the preparation.

[0017] In an optional embodiment, after the base plate assembly is assembled, a clamp is set on the base plate assembly for fastening, and the clamp is removed after laser welding segment positioning.

[0018] In an optional implementation, tungsten inert gas (TIG) welding is used for welding.

[0019] In an optional embodiment, when laser welding is performed on the external butt joint of the base plate assembly for segmented positioning, the length of each weld segment is controlled to be 300mm to 500mm, and the welding gun is used for horizontal welding.

[0020] In an optional embodiment, when continuously welding the outer weld of the base plate and the mesh reinforcement, a turning torch is used to perform normal welding in the horizontal direction with the welding trajectory direction perpendicular to the welding trajectory, maintaining a penetration depth of not less than 10mm.

[0021] In an optional embodiment, when welding the base plate and the inner mesh ring of the mesh reinforcement, a right-angle welding torch is used to weld the normal direction at a 45° angle between the torch and the welding trajectory direction, maintaining a penetration depth of not less than 7mm.

[0022] In an optional embodiment, when laser welding is performed on both sides of the external and internal butt welds of the main load-bearing structure for segmented positioning, and when laser welding is performed on both sides of the external and internal butt welds of the box body for segmented positioning, the external welds are positioned in 3 to 5 segments, each segment having a length of 300mm to 500mm, and the internal welds are positioned in 2 to 3 segments, each segment having a length of 100mm to 200mm, while maintaining a penetration depth of not less than 10mm.

[0023] In an optional embodiment, after segmenting and positioning the housing, when welding the butt joint between the outer support ring and the panel, a right-angle welding torch is used to perform normal welding in the vertical direction downwards, with a penetration depth of not less than 10mm; after laser welding the butt joint between the outer support ring and the panel, tungsten inert gas (TIG) welding is used for cover welding, with a single-sided weld penetration depth of not less than 15mm; for the parts inside the housing that cannot be welded by the laser welding torch, TIG welding is used to fill the weld bevel, with a weld penetration depth of not less than 5mm; the outer panel and the reinforcing plate of the housing are welded using TIG welding, with a weld leg height of not less than 5mm.

[0024] In an optional embodiment, when preparing the base plate and the mesh reinforcement, the base plate is formed by forging and machining, and the mesh reinforcement is formed by separate casting, welding and machining processes; when assembling the base plate assembly, the welding parts of the base plate are pre-formed with bosses and machined with V-shaped butt bevels; the welding parts of the mesh reinforcement are machined with V-shaped butt bevels.

[0025] In an optional embodiment, after cleaning the surface of the enclosure, the enclosure is heated and kept at a constant temperature, and then cooled to room temperature in the furnace for vacuum stress-relief annealing; then the enclosure is inspected for weld seams using fluorescent flaw detection; after the weld seam inspection requirements are met, the enclosure is machined to remove excess material until the specifications of the enclosure meet the requirements.

[0026] Compared with the prior art, the advantages of this application are:

[0027] The preparation method described in this application is used for the fabrication of titanium alloy enclosures. The method includes: preparing a base plate and mesh reinforcement, assembling them to form a base plate assembly, and welding the rounded corners where the base plate and mesh reinforcement intersect; after laser welding the external butt joints of the base plate assembly into segments for positioning, performing continuous laser welding on the external welds and internal mesh rings of the base plate and mesh reinforcement; preparing side wall panels and load-bearing plates, and assembling them with the base plate assembly to form a main load-bearing structure; welding the three intersecting roots of the side wall panels, load-bearing plates, and base plate assembly; and connecting the side wall panels and load-bearing plates... Welding is performed on the upper surface of the butt joint; laser welding is performed on both sides of the butt welds on the outside and inside of the main load-bearing structure for segmented positioning, and then continuous laser welding is performed; support rings, panels, and reinforcing plate assemblies are prepared and assembled with the main load-bearing structure to form a box body; the end faces of each weld joint of the assembly parts of the box body are positioned and welded; laser welding is performed on both sides of the external and internal butt welds of the box body for segmented positioning, and then continuous laser welding is performed; after all the internal and external welds of the box body are fully welded, the weld surfaces are polished and the surface of the box body is cleaned to complete the preparation.

[0028] This fabrication method effectively addresses many shortcomings of existing monolithic molding schemes through a phased assembly and welding approach. First, a base plate and mesh reinforcement are prepared and assembled to form the base plate assembly. Welding is then performed at the intersecting rounded corners, followed by segmented positioning via laser welding and continuous welding of the external and internal mesh rings. Next, side wall panels and load-bearing plates are assembled sequentially to form the main load-bearing structure. Welding is then performed at the three-sided intersections and the upper surfaces of the butt joints. Following this, the inner and outer butt welds of the main load-bearing structure are segmented, positioned, and continuously welded. Finally, support rings, panels, and reinforcing plates are assembled to form the box body, completing the positioning welding, continuous welding, finishing, and surface cleaning of each weld. This assembly and welding process breaks down the large and complex box structure into multiple easily processed and assembled components, each with a relatively small size, avoiding the problem of being unable to form large components due to equipment size limitations in monolithic casting, forging, and additive manufacturing schemes.

[0029] Meanwhile, laser welding is used for different parts of each component. Taking advantage of the characteristics of laser welding, such as large penetration depth, high energy density, small heat-affected zone and small welding deformation, the welding process can be precisely controlled to ensure the accuracy of the welded parts. This solves the problems of insufficient accuracy and cleanliness caused by poor surface roughness and difficult internal surface processing in the overall casting solution, as well as the difficulty in forming closed structures with high internal precision in the overall additive manufacturing solution.

[0030] This manufacturing method combines modular assembly with precision laser welding, which not only meets the forming requirements of large boxes, but also ensures high dimensional accuracy, high geometric tolerance, high structural strength, high rigidity stability and high thermal stability, while improving surface cleanliness. Ultimately, it achieves the manufacturing of high-strength, high-precision and high-cleanliness titanium alloy boxes. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic flowchart of the preparation method provided in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the assembly of the base plate and the mesh reinforcement provided in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of a typical joint welding of the base plate assembly provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the base plate assembly structure provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the main load-bearing structure assembly provided in the embodiments of this application;

[0037] Figure 6 This is a schematic diagram of the sidewall panel structure provided in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram of a load-bearing plate structure provided in an embodiment of this application;

[0039] Figure 8 This is a schematic diagram of the welding of the butt joint at the intersection of the load-bearing plate provided in an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the box assembly structure provided in an embodiment of this application;

[0041] Figure 10 This is a schematic diagram of the reinforcing plate assembly structure provided in the embodiments of this application;

[0042] Figure 11 This is a schematic diagram of the support ring structure provided in an embodiment of this application;

[0043] Figure 12 This is a schematic diagram of the panel structure provided in an embodiment of this application;

[0044] In the diagram: 100, base plate assembly; 101, base plate; 102, mesh reinforcement; 200, main load-bearing structure; 201, side wall panel; 202, load-bearing plate; 301, support ring; 302, panel; 303, reinforcing plate assembly; 400, box body. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are merely for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0046] Figure 1 This is a schematic flowchart of the preparation method provided in the embodiments of this application.

[0047] like Figure 1 As shown, a method for preparing a titanium alloy housing 400 includes:

[0048] like Figure 2 , Figure 3 as well as Figure 4 As shown, Figure 2 This is a schematic diagram of the assembly of the base plate 101 and the mesh reinforcement 102 provided in an embodiment of this application; Figure 3 This is a typical joint welding diagram of the base plate 101 assembly provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the base plate 101 assembly provided in an embodiment of this application;

[0049] Prepare a base plate 101 and a mesh reinforcement 102, assemble them to form a base plate 101 assembly, and weld the rounded corners where the base plate 101 and the mesh reinforcement 102 intersect.

[0050] After laser welding segmentation and positioning of the external butt joint of the base plate 101 assembly, laser continuous welding is performed on the external weld and internal mesh ring of the base plate 101 and the mesh reinforcement 102.

[0051] like Figure 5 , Figure 6 , Figure 7 as well as Figure 8 As shown, Figure 5 This is a schematic diagram of the assembly structure of the main load-bearing structure 200 provided in the embodiments of this application; Figure 6 This is a schematic diagram of the side wall panel 201 structure provided in an embodiment of this application; Figure 7 This is a schematic diagram of the load-bearing plate 202 provided in an embodiment of this application; Figure 8A schematic diagram of the welding of the butt joint at the intersection of the load-bearing plate 202 provided in the embodiments of this application;

[0052] Prepare side wall panels 201 and load-bearing plates 202, and assemble them with the base plate 101 assembly to form a main load-bearing structure 200. Weld the three-sided intersection root of the side wall panels 201, load-bearing plates 202 and base plate 101 assembly.

[0053] Weld the upper end face of the butt joint between the side wall panel 201 and the load-bearing plate 202;

[0054] After laser welding segmentation and positioning of the butt welds on both sides of the external and internal butt welds of the main load-bearing structure 200, continuous laser welding is continued.

[0055] like Figure 9 , Figure 10 , Figure 11 as well as Figure 12 As shown, Figure 9 This is a schematic diagram of the assembly structure of the housing 400 provided in an embodiment of this application; Figure 10 This is a schematic diagram of the structural composition of the reinforcing plate assembly 303 provided in an embodiment of this application; Figure 11 This is a schematic diagram of the support ring 301 structure provided in an embodiment of this application; Figure 12 This is a schematic diagram of the panel 302 structure provided in an embodiment of this application;

[0056] Prepare a support ring 301, a panel 302, and a reinforcing plate assembly 303, and assemble them with the main load-bearing structure 200 to form a box 400. Position and weld the end faces of each weld joint of the assembly parts of the box 400.

[0057] After laser welding segmentation and positioning of the external and internal butt welds of the box body 400, continuous laser welding is continued.

[0058] After all the internal and external welds of the box 400 are fully welded, the weld surfaces are polished and the surface of the box 400 is cleaned to complete the preparation.

[0059] In an optional embodiment, the preparation method of this application is used for the preparation of a titanium alloy box 400. The preparation method includes: preparing a base plate 101 and a mesh reinforcement 102, assembling them to form a base plate 101 assembly, and welding the rounded corners of the intersection of the base plate 101 and the mesh reinforcement 102; after laser welding segmentation and positioning of the external butt joints of the base plate 101 assembly, performing continuous laser welding on the external welds and internal mesh rings of the base plate 101 and the mesh reinforcement 102; preparing side wall panels 201 and load-bearing plates 202, and assembling them with the base plate 101 assembly to form a main load-bearing structure 200; and welding the three-sided intersection roots of the side wall panels 201, the load-bearing plates 202, and the base plate 101 assembly; and... The upper end face of the butt joint between the side wall panel 201 and the load-bearing plate 202 is welded; after laser welding segmentation and positioning on both sides of the butt welds on the outside and inside of the main load-bearing structure 200, continuous laser welding is continued; the support ring 301, panel 302, and reinforcing plate assembly 303 are prepared and assembled with the main load-bearing structure 200 to form a box 400; the end faces of each weld joint of the assembly parts of the box 400 are positioned and welded; after laser welding segmentation and positioning on both sides of the external and internal butt welds of the box 400, continuous laser welding is continued; after all the internal and external welds of the box 400 are fully welded, the weld surface is polished and the surface of the box 400 is cleaned to complete the preparation.

[0060] This manufacturing method effectively solves many defects of existing integral molding schemes through staged assembly and welding. First, the base plate 101 and mesh reinforcement 102 are prepared and assembled to form the base plate 101 assembly. Welding is then performed at the intersecting rounded corners, followed by segmented positioning via laser welding and continuous welding of the external and internal mesh rings. Next, the side wall panels 201 and load-bearing plates 202 are assembled sequentially to form the main load-bearing structure 200. Welding is then performed at the three-sided intersection root and the upper end face of the butt joint. Next, the inner and outer butt welds of the main load-bearing structure 200 are segmented, positioned, and continuously welded on both sides. Finally, the support ring 301, panel 302, and reinforcing plate assembly 303 are assembled to form the box body 400, completing the positioning welding, continuous welding, finishing, and surface cleaning of each weld. This assembly and welding process breaks down the large and complex box body 400 structure into multiple easily processed and assembled components. Each component is relatively small in size, avoiding the problem of being unable to form large components due to equipment size limitations in integral casting, forging, and additive manufacturing schemes.

[0061] Meanwhile, laser welding is used for different parts of each component. Taking advantage of the characteristics of laser welding, such as large penetration depth, high energy density, small heat-affected zone and small welding deformation, the welding process can be precisely controlled to ensure the accuracy of the welded parts. This solves the problems of insufficient accuracy and cleanliness caused by poor surface roughness and difficult internal surface processing in the overall casting solution, as well as the difficulty in forming closed structures with high internal precision in the overall additive manufacturing solution.

[0062] This manufacturing method combines modular assembly with precision laser welding, which not only meets the forming requirements of the large box 400, but also ensures high dimensional accuracy, high form and position tolerance, high structural strength, high rigidity stability and high thermal stability, while improving surface cleanliness. Ultimately, it achieves the manufacturing of a high-strength, high-precision and high-cleanliness titanium alloy box 400.

[0063] In an optional embodiment, after the base plate 101 assembly is assembled, a clamp is set on the base plate 101 assembly for fastening connection, and the clamp is removed after laser welding segment positioning.

[0064] After the base plate 101 assembly is assembled, to further ensure that the assembly accuracy is not affected during the welding process, dedicated precision fixtures are installed on the base plate 101 assembly for fastening. These fixtures are made of high-strength alloy materials, and wear-resistant ceramic plates can be placed at the contact points with the base plate 101 assembly to provide sufficient clamping force while avoiding scratches on the assembly surface. The fixtures are arranged according to the principle of symmetry and uniformity, and are set along the edges of the base plate 101 assembly and at key nodes of the grid ribs 102. The clamping force is adjusted by bolts to keep the assembly gap between the base plate 101 and the grid ribs 102 stably controlled within the required range. After the laser welding segmentation positioning is completed and the weld has formed a preliminary fixing effect, the fixtures are gradually disassembled from the middle to both ends. This effectively prevents the assembly from springback deformation caused by improper fixture disassembly sequence, ensuring the structural stability of the base plate 101 assembly.

[0065] In an optional implementation, tungsten inert gas (TIG) welding is used. This welding method uses a tungsten rod as the electrode and argon gas as the shielding gas, effectively isolating the titanium alloy from air and preventing oxidation during welding. During welding, a distance of 2-3 mm is maintained between the tungsten electrode and the workpiece. The high temperature generated by the arc melts the workpiece to form a weld. Argon gas is used as the shielding gas, and its flow rate is adjusted according to the welding current to ensure a stable shielding gas layer is formed in the weld area, reducing welding defects such as porosity and slag inclusions. This method is particularly suitable for processes such as cover welds where high weld quality is required.

[0066] In an optional embodiment, when laser welding is performed on the external butt joint of the base plate 101 assembly for segmented positioning, the length of each weld segment is controlled to be 300mm to 500mm, and the welding gun is used for horizontal normal welding.

[0067] The length of each weld segment must be strictly controlled within the range of 300mm to 500mm. This length range is set by comprehensively considering the balance between welding stress release and positioning effect. It avoids the problems of too many positioning points and stress concentration during subsequent continuous welding caused by segments that are too short, while preventing welding deformation from being ineffectively controlled due to segments that are too long. At the same time, the welding torch must be aligned horizontally with the center of the weld to ensure that the laser beam can act perpendicularly on the weld joint, so that the fusion line of the weld is evenly distributed, providing sufficient positioning strength and laying a good foundation for subsequent continuous welding.

[0068] In an optional embodiment, when continuously welding the outer weld of the base plate 101 and the mesh reinforcement 102, a turning torch is used to perform normal welding in the horizontal direction with the welding trajectory direction perpendicular to the welding trajectory, maintaining a penetration depth of not less than 10mm.

[0069] A rotating welding torch is used, perpendicular to the welding trajectory, and performs normal welding along the horizontal direction. It can flexibly adapt to the straight or gently curved trajectory of the external weld, ensuring the laser beam always acts perpendicularly on the weld surface, guaranteeing uniform penetration depth of at least 10mm. During welding, the CNC system precisely controls the matching of the torch's movement speed and laser power. When slight changes occur in the weld thickness, the laser power automatically adjusts within a preset range to maintain a stable penetration depth, ensuring the external weld has sufficient structural strength to meet the overall rigidity requirements of the 400mm enclosure.

[0070] In an optional embodiment, when welding the inner mesh rings of the base plate 101 and the mesh reinforcement 102, a right-angle welding torch is used to weld the normal direction at a 45° angle between the torch and the welding trajectory direction, maintaining a penetration depth of not less than 7mm.

[0071] A right-angle welding torch is used, perpendicular to the welding trajectory, and tilted at a 45° angle in the horizontal direction for normal welding. The internal mesh ring structure is complex and space is limited. The right-angle torch allows for deep penetration into the internal ring area, while the 45° tilt angle enables the laser beam to be better focused on the welding area of ​​the ring, effectively avoiding obstruction from surrounding structures. During welding, a penetration depth of at least 7mm is maintained. This penetration depth requirement considers both the load-bearing capacity of the internal ring and avoids excessive thermal deformation due to excessive penetration, ensuring that the internal mesh ring provides effective support while maintaining the dimensional stability of the base plate 101 assembly.

[0072] In an optional embodiment, when performing laser welding segmented positioning on both sides of the external and internal butt welds of the main load-bearing structure 200, and when performing laser welding segmented positioning on both sides of the external and internal butt welds of the box body 400, the external welds are positioned in 3 to 5 segments, each segment being 300mm to 500mm long; the internal welds are positioned in 2 to 3 segments, each segment being 100mm to 200mm long. When welding the butt welds between the external load-bearing plate 202 of the main load-bearing structure 200 of the box body 400 and the bottom plate 101 and side wall plate 201, a turning torch is used with the welding trajectory direction perpendicular to the direction of welding, and normal welding is performed in the horizontal direction to ensure a penetration depth of not less than 10. When welding the internal load-bearing plate 202 of the main load-bearing structure 200 of the box body 400... When welding the butt joints at the intersections, and the butt joints between the side wall plate 201 and the load-bearing plate 202, a turning torch is used perpendicular to the welding trajectory direction, and normal welding is performed along the horizontal direction to ensure a penetration depth of not less than 10mm. When welding the butt joints between the bottom plate 101 assembly inside the main load-bearing structure 200 of the box body 400 and the side wall plate 201 and the load-bearing plate 202, a right-angle torch is used perpendicular to the welding trajectory direction, and normal welding is performed at a 45° angle to the horizontal direction to ensure a penetration depth of not less than 10mm. After laser welding the butt joints at the intersections of the load-bearing plates 202 inside the main load-bearing structure 200 of the box body 400, TIG welding is used for cover welding to ensure that the effective penetration depth of the double-sided welds in the main load-bearing parts is not less than 30mm, and the above butt joints are arranged as V-shaped welds.

[0073] Different segmentation strategies are adopted for external and internal welds based on their different characteristics. External welds, due to their relatively long length and location on the structural periphery, are divided into 3-5 segments for positioning, with each segment's length controlled between 300mm and 500mm. This ensures effective positioning while maximizing stress release during welding. Internal welds, due to their confined space and complex structure, are divided into 2-3 segments for positioning, with each segment's length between 100mm and 200mm, to accommodate the limited internal operating space. Regardless of whether the segmented positioning welds are external or internal, the penetration depth is maintained at no less than 10mm to ensure sufficient strength and prevent structural displacement during subsequent continuous welding.

[0074] In an optional embodiment, after segmenting and positioning the housing 400, when welding the butt weld between the outer support ring 301 and the panel 302 of the housing 400, a right-angle welding torch is used to perform normal welding in the vertical direction downwards, and the penetration depth is not less than 10mm; after laser welding the butt weld between the outer support ring 301 and the panel 302 of the housing 400, tungsten inert gas (TIG) welding is used for cover welding, and the penetration depth of the weld on one side is not less than 15mm; for the parts inside the housing 400 that cannot be welded by the laser welding torch, TIG welding is used to fill the welding groove, and the weld penetration depth is not less than 5mm; the outer panel 302 of the housing 400 and the reinforcing plate are welded using TIG welding, and the weld leg height is not less than 5mm.

[0075] After segmenting and positioning the enclosure 400, when welding the butt joint between the external support ring 301 and the panel 302, a right-angle welding torch is used to perform normal welding vertically downwards. This welding angle ensures precise alignment with the root of the butt joint, guaranteeing a penetration depth of at least 10mm and ensuring the connection strength between the support ring 301 and the panel 302. After laser welding of the butt joint between the external support ring 301 and the panel 302 of the enclosure 400, tungsten inert gas (TIG) welding is used for cover welding to further improve the surface quality and sealing of the weld. During cover welding, the penetration depth of the weld on one side must be at least 15mm to ensure a smooth weld surface and reduce stress concentration points.

[0076] For confined areas inside the enclosure 400 where laser welding torches cannot be used, TIG welding (tungsten inert gas welding) is employed to filler wires at the weld bevels. Titanium alloy welding wire with a composition matching the base material is selected to ensure a weld penetration depth of at least 5mm, meeting the connection strength requirements of these special areas. The connection between the external panel 302 and the reinforcing plate of the enclosure 400 is achieved using tungsten inert gas welding (TIG). The weld bead height formed during welding is at least 5mm. By increasing the stress-bearing area of ​​the weld, the connection rigidity between panel 302 and the reinforcing plate is improved, enhancing the overall load-bearing capacity of the enclosure 400.

[0077] In an optional embodiment, when preparing the base plate 101 and the mesh reinforcement 102, the base plate 101 is formed by forging and machining, and the mesh reinforcement 102 is formed by separate casting, welding and machining processes; when assembling the base plate 101 assembly, the welding parts of the base plate 101 are pre-formed with bosses and V-shaped butt bevels are machined; the welding parts of the mesh reinforcement 102 are machined with V-shaped butt bevels.

[0078] When preparing the base plate 101 and the mesh reinforcement 102, the base plate 101 is formed by forging and machining. The forging material undergoes strict quality screening to ensure uniform internal structure and absence of defects such as cracks. Through multiple milling and grinding machining processes, the flatness, perpendicularity, and other dimensional and positional tolerances of the base plate 101 are guaranteed to meet design standards. The mesh reinforcement 102 is formed by separate casting, welding, and machining. Separate casting reduces the forming difficulty of complex structures. Laser welding is used during the welding process to ensure the connection strength between the parts. Afterward, precision machining ensures the dimensional accuracy and surface quality of the mesh reinforcement 102. When assembling the base plate 101 assembly, a boss is pre-machined at the welding part of the base plate 101. The height and size of the boss are determined according to the design requirements of the welding bevel. At the same time, a V-shaped butt bevel is machined on the boss. The welding part of the mesh reinforcement 102 is also machined with a V-shaped butt bevel, the angle of which matches the V-shaped bevel of the base plate 101, ensuring that the bevel can form a complete welding gap after assembly, providing good conditions for subsequent welding penetration.

[0079] In an optional embodiment, after cleaning the surface of the housing 400, the housing 400 is heated and kept at a certain temperature, and then cooled to room temperature in the furnace for vacuum stress-relief annealing; then the housing 400 is inspected for weld seams using fluorescent flaw detection method; after the weld seam inspection requirements are met, the housing 400 is machined to remove the excess material in the shape until the specifications of the housing 400 meet the requirements.

[0080] After cleaning the surface of the housing 400, to eliminate the internal stress generated during welding and ensure the dimensional stability of the housing 400, vacuum stress-relief annealing is required. Specifically, the housing 400 is placed in a vacuum annealing furnace and heated to 600-650℃ at a heating rate of 5-10℃ / min, then held at that temperature for 3-4 hours to fully release internal stress. Afterward, it is cooled to room temperature with the furnace at a rate controlled at 2-5℃ / min to avoid generating new stress due to excessively rapid cooling. After annealing, all welds are inspected using fluorescent penetrant testing. A fluorescent penetrant is evenly applied to the weld surface, and after a period of penetration, excess penetrant is removed. A developer is then applied, and the presence of fluorescence under ultraviolet light is observed to determine the presence of defects such as cracks and porosity in the weld. After meeting the weld inspection requirements, the housing 400 is machined. The external allowance is removed through milling, grinding and other processes. During the machining process, a coordinate measuring machine is used to monitor the dimensional accuracy of the housing 400 in real time until its specifications fully meet the design requirements, ensuring that the dimensional accuracy, form and position tolerance and other indicators of the housing 400 meet the assembly standards of the precision laser system.

[0081] In actual operation, the following steps are performed:

[0082] 1. The base plate 101 is formed by machining forging. The welding parts of the base plate 101 are pre-formed with 10mm to 15mm bosses and V-shaped butt bevels are machined. The mesh reinforcement 102 is formed by separate casting, welding and machining. The welding parts of the mesh reinforcement 102 are machined with V-shaped butt bevels.

[0083] A 3mm allowance is left on each boss surface on the lower surface of the base plate 101, and the bosses at each welding position on the upper surface are filled into solids; a 3mm allowance is left on the lower surface of the mesh reinforcement 102; a 10mm allowance is left at the welding positions between the sides of the base plate 101 and the mesh reinforcement 102 and the side wall plate 201.

[0084] 2. First, degrease the base plate 101 and the mesh reinforcement 102 for 5 to 25 minutes, then soak them in a mixed acid solution for 0.5 to 4 minutes to remove the oxide scale. Next, wash them with clean water at 40℃ to 60℃ 2 to 3 times. Finally, dry the base plate 101 and the mesh reinforcement 102 with clean compressed air.

[0085] 3. The side wall panel 201, load-bearing plate 202, panel 302 and reinforcing plate assembly 303 are formed by forging and machining.

[0086] The support ring 301 is formed by substrate hybrid additive printing and machining.

[0087] Before welding, leave a 3mm allowance for the inner annular boss of the support ring 301; before welding, leave a 3mm allowance for the end face of each boss on the outer side of the side wall plate 201, and a 2mm allowance for the stepped hole. Do not machine the holes and sealing grooves on the end faces of the bosses. Machine the threaded holes on the non-mounting surface. Leave a 3mm allowance on the bottom surface; before welding, leave a 2mm allowance for the bosses and stepped holes on the load-bearing plate 202; leave a 2mm allowance for the square bosses and irregular bosses on the upper surface of the panel 302. Machine the threaded holes on the non-mounting surface.

[0088] 4. Remove 1mm of excess material from the lower surface of the base plate 101 assembly and machine it to a smooth finish to ensure the bottom surface of the enclosure 400 is level during assembly; machine a V-shaped bevel at the welding points on the upper surface of the base plate 101 assembly; machine a V-shaped bevel at the welding points on the sides of the base plate 101 assembly; machine a V-shaped bevel at the welding points on the inner side of the side wall panel 201; pre-form a 10mm-15mm boss at the welding points on the vertical surface of the load-bearing plate 202 and machine a V-shaped bevel; machine a V-shaped bevel at the welding points on the end face and bottom surface of the load-bearing plate 202; machine a chamfer at the welding points on the upper surface of the load-bearing plate 202; pre-form a 10mm-15mm boss at the welding points on the outer circular surface of the support ring 301 and machine a chamfer; machine a chamfer on the outer side of the upper circular ring of the support ring 301; machine a chamfer on the inner circle of the panel 302, and pre-form a 10mm-15mm boss at the welding points on the lower surface and machine a chamfer.

[0089] 5. The base plate 101 assembly, side wall panel 201, load-bearing plate 202, support ring 301, panel 302 and reinforcing plate assembly 303 are first degreased for 5 min to 25 min, then soaked in a mixed acid solution for 0.5 min to 4 min to remove oxide scale, then washed with clean water at 40℃ to 60℃ 2 to 3 times, and finally dried with clean compressed air.

[0090] 6. Assemble the base plate 101 and the grid reinforcement 102 to form the base plate 101 assembly, and fasten the outer perimeter with clamps.

[0091] 7. Perform TIG welding for positioning at the cross-shaped rounded corner of the base plate 101 and the mesh reinforcement 102;

[0092] 8. Perform laser welding on the external butt joints of the base plate 101 component to segment and position them. The length of each weld segment is 300mm to 500mm. The welding gun is used for horizontal normal welding.

[0093] 9. After the positioning welding is completed, remove the fixture and use laser welding to continuously weld the outer perimeter welds and inner mesh ring welds of the base plate 101 and the mesh reinforcement 102. When welding the inner mesh welds, use a right-angle torch with the welding trajectory direction perpendicular to the direction of welding and at a 45° angle to the horizontal direction to perform normal welding, ensuring that the penetration depth is not less than 7mm. When welding the outer perimeter welds, use a turning torch with the welding trajectory direction perpendicular to the direction of welding and along the horizontal direction to perform normal welding, ensuring that the penetration depth is not less than 10mm.

[0094] 10. Assemble the base plate 101, side wall plate 201, and load-bearing plate 202 to form the main load-bearing structure 200 of the box body 400. The welded parts are assembled with butt joints and bevels, and external clamps are used for fastening and restraint.

[0095] 11. Perform TIG welding for positioning at the three-sided intersection of the base plate 101 assembly, side wall panel 201, and load-bearing plate 202 after assembly;

[0096] 12. Perform TIG welding for positioning on the upper end face of the butt joint between the side wall panel 201 and the load-bearing plate 202;

[0097] 13. Laser welding is performed on both sides of the external butt weld and the internal V-shaped butt weld of the 400 main load-bearing structure 200 of the box body for segmented positioning. The external weld is positioned in 3 to 5 segments, with each segment having a length of 300mm to 500mm. The internal weld is positioned in 2 to 3 segments, with each segment having a length of 100mm to 200mm.

[0098] 14. After the positioning welding is completed, remove the fixture and use laser welding to continuously weld the external butt welds and internal V-shaped butt welds of the main load-bearing structure 200 of the box body 400; when welding the butt welds between the external load-bearing plate 202 of the main load-bearing structure 200 of the box body 400 and the bottom plate 101 assembly and the side wall plate 201, use a turning torch head perpendicular to the welding trajectory direction and perform normal welding in the horizontal direction to ensure that the penetration depth is not less than 10mm; when welding the internal load-bearing plate 202 of the main load-bearing structure 200 of the box body 400... When welding the V-shaped butt joint at the intersection and the V-shaped butt joint between the side wall plate 201 and the load-bearing plate 202, a turning torch should be used with the welding trajectory direction perpendicular to the direction of welding and the normal direction along the horizontal direction to ensure that the penetration depth is not less than 10mm; when welding the V-shaped butt joint between the inner bottom plate 101 component of the main load-bearing structure 200 of the box body 400 and the side wall plate 201 and the load-bearing plate 202, a right-angle torch should be used with the welding trajectory direction perpendicular to the direction of welding and the normal direction at a 45° angle to the horizontal direction to ensure that the penetration depth is not less than 10mm;

[0099] 15. After laser welding of the V-shaped butt weld at the intersection of the main load-bearing structure 200 and the internal load-bearing plate 202 of the box body 400, TIG welding is used for cover welding to ensure that the effective penetration depth of the double-sided weld of the main load-bearing part is not less than 30mm.

[0100] 16. Assemble the support ring 301, panel 302, and reinforcing plate assembly 303 with the main load-bearing structure 200 of the box 400 to form the box 400. The box 400 is externally fastened and constrained by clamps.

[0101] 17. Perform TIG welding positioning welding on the end faces of each weld joint of the 400 enclosure assembly; perform laser welding segmented positioning on both sides of the external butt welds and the V-shaped butt welds of the internal non-interference laser welding gun head of the 400 enclosure, with the external welds divided into 3 to 5 segments, each segment being 300mm to 500mm long; and the internal welds divided into 2 to 3 segments, each segment being 100mm to 200mm long.

[0102] 18. After the positioning welding is completed, remove the fixture and use laser welding to continuously weld the external butt weld and internal V-shaped butt weld of the box body 400; when welding the butt weld between the external main load-bearing structure 200 and the reinforcing plate assembly 303 of the box body 400, and the V-shaped butt weld between the internal side wall panel 201 and the reinforcing plate assembly 303, use a turning torch head perpendicular to the welding trajectory direction and perform normal welding in the horizontal direction to ensure that the penetration depth is not less than 10mm; when welding the butt weld between the external support ring 301 and the panel 302 of the box body 400, use a right-angle torch head and perform normal welding in the vertical direction downward to ensure that the penetration depth is not less than 10mm;

[0103] 19. After laser welding of the butt weld between the external support ring 301 of the enclosure 400 and the panel 302, TIG welding is used for cover welding to ensure that the weld penetration depth on one side is not less than 15mm; for the parts inside the enclosure 400 that cannot be welded by the laser welding gun, TIG welding is used to fill the welding groove to ensure that the weld penetration depth is not less than 5mm; for the corner joints between the external panel 302 of the enclosure 400 and the reinforcing plate assembly 303, TIG welding is used to ensure that the weld height is not less than 5mm.

[0104] 20. After all the internal and external welds of the enclosure 400 are fully welded, the weld surfaces are polished and the welding spatter particles on the surface of the enclosure 400 are cleaned.

[0105] 21. The 400mm enclosure is sent for heat treatment, specifically vacuum stress-relief annealing. The heat treatment specifications are: heating temperature 620℃±10℃, holding temperature for 4 hours, and then cooling to room temperature in the furnace. The 400mm enclosure is then sent for weld inspection, using fluorescent penetrant testing. Cracks and other defects are not allowed in the welds of the 400mm enclosure, both internally and externally. The 400mm enclosure is then sent for machining to remove excess material, ensuring that dimensional accuracy and geometric tolerances meet the design requirements.

[0106] It should be understood that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of the invention.

[0107] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0108] It should be understood that in the description of this invention, the terms "upper," "vertical," "inner," "outer," etc., indicate the orientation or positional relationship as commonly placed when the disclosed product is used, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0109] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0110] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or combinations thereof.

[0111] Specific details are provided in the following description to provide a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may be omitted in the depiction of non-essential details to avoid obscuring the exemplary embodiments.

[0112] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0113] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A method for preparing a titanium alloy box, characterized in that, The preparation method includes: Prepare a base plate and a grid reinforcement, assemble them to form a base plate assembly, and weld the rounded corners where the base plate and the grid reinforcement intersect. After laser welding segmentation and positioning of the external butt joint of the base plate assembly, laser continuous welding is performed on the external weld and internal mesh ring of the base plate and the mesh reinforcement. Prepare side wall panels and load-bearing plates, and assemble them with the base plate assembly to form the main load-bearing structure. Weld the three intersecting roots of the side wall panels, the load-bearing plates, and the base plate assembly. Weld the upper end face of the joint between the side wall panel and the load-bearing plate; After laser welding segmentation and positioning of the butt welds on both sides of the external and internal main load-bearing structure, continuous laser welding is continued. Prepare the support ring, panel and reinforcing plate assembly, and assemble them with the main load-bearing structure to form a box body. Position and weld the end faces of each weld joint of the assembly parts of the box body. After laser welding segmentation and positioning on both sides of the external and internal butt welds of the box body, continuous laser welding is continued. After all the internal and external welds of the box body are fully welded, the surface of the welds is polished and the surface of the box body is cleaned to complete the preparation.

2. The method for preparing the titanium alloy box as described in claim 1, characterized in that: After the base plate assembly is assembled, a clamp is set on the base plate assembly for fastening, and the clamp is removed after laser welding segment positioning.

3. The method for preparing the titanium alloy housing as described in claim 1, characterized in that: Tungsten inert gas (TIG) welding is used for welding.

4. The method for preparing the titanium alloy box as described in claim 1, characterized in that: When performing laser welding segmented positioning on the external butt joint of the base plate assembly, the length of each weld segment is controlled to be 300mm to 500mm, and the welding gun is used for horizontal normal welding.

5. The method for preparing the titanium alloy box as described in claim 1, characterized in that: When continuously welding the outer weld of the base plate and the mesh reinforcement, a turning torch is used to weld in the normal direction perpendicular to the welding trajectory and along the horizontal direction, maintaining a penetration depth of not less than 10mm.

6. The method for preparing the titanium alloy box as described in claim 1, characterized in that: When welding the base plate and the inner mesh ring of the mesh reinforcement, a right-angle welding torch is used to weld the normal direction at a 45° angle between the torch and the welding trajectory direction, maintaining a penetration depth of not less than 7mm.

7. The method for preparing the titanium alloy box as described in claim 1, characterized in that: When performing laser welding segmented positioning on both sides of the external and internal butt welds of the main load-bearing structure, and when performing laser welding segmented positioning on both sides of the external and internal butt welds of the box body, the external welds are positioned in 3 to 5 segments, each segment having a weld length of 300mm to 500mm, and the internal welds are positioned in 2 to 3 segments, each segment having a weld length of 100mm to 200mm, while maintaining a penetration depth of not less than 10mm.

8. The method for preparing the titanium alloy box as described in claim 1, characterized in that: After segmenting and positioning the enclosure, when welding the butt joint between the outer support ring and the panel, a right-angle welding torch is used to perform normal welding in the vertical direction downwards, with a penetration depth of not less than 10mm. After laser welding the butt joint between the outer support ring and the panel, tungsten inert gas (TIG) welding is used for cover welding, with a single-sided weld penetration depth of not less than 15mm. For the parts inside the enclosure that cannot be welded by the laser welding torch, TIG welding is used to fill the weld bevel, with a weld penetration depth of not less than 5mm. The outer panel and the reinforcing plate of the enclosure are welded using TIG welding, with a weld leg height of not less than 5mm.

9. The method for preparing the titanium alloy box as described in claim 1, characterized in that: When preparing the base plate and the mesh reinforcement, the base plate is formed by forging and machining, and the mesh reinforcement is formed by separate casting, welding and machining processes. When assembling the base plate assembly, the welding parts of the base plate are pre-formed with bosses and V-shaped butt bevels are machined. The welding parts of the mesh reinforcement are machined with V-shaped butt bevels.

10. The method for preparing the titanium alloy box as described in claim 1, characterized in that: After cleaning the surface of the enclosure, the enclosure is heated and kept at that temperature, and then cooled to room temperature in the furnace for vacuum stress-relief annealing. Then, the enclosure is inspected for weld seams using fluorescent flaw detection. After the weld seam inspection requirements are met, the enclosure is machined to remove excess material until the dimensions of the enclosure meet the requirements.

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