A sheathing device for hot isostatic diffusion welding of hemispherical workpieces.

Abstract

This invention provides a sheathing device for hot isostatic diffusion welding of hemispherical workpieces, comprising an inner sheath, an outer sheath, and an extraction pipe. The inner sheath can be embedded into the outer sheath to form a cavity for accommodating the hemispherical workpiece to be welded. The extraction pipe is connected to the side wall of the inner sheath. This invention enables precise connection with high connection strength when welding two hemispherical workpieces. After welding, other surfaces of the workpiece do not adhere to the sheath and can be easily removed, resulting in a good surface condition without the need for secondary processing.

Description

Technical Field

[0001] This invention relates to the field of hot isostatic diffusion welding technology, and in particular to a sheathing device for hot isostatic diffusion welding of hemispherical workpieces. Background Technology

[0002] Traditional welding methods often struggle to achieve precise connections between two hemispherical shells. Hot isostatic pressure diffusion welding (HIPD) seals the materials to be joined within a sheath, applying high-temperature, high-pressure gas evenly from all directions to the outer surface of the sheath, thus achieving contact and diffusion bonding between the material interfaces. By designing a suitable sheath and adjusting process parameters, HIPD can achieve precise connections between two hemispherical shells, resulting in joints with high strength.

[0003] The sheath design is the most critical aspect of hot isostatic pressure diffusion welding. The sheath must ensure effective pressure conduction for bonding between workpieces during the hot isostatic pressure process. Under the temperature and pressure of hot isostatic pressure diffusion welding, the sheath material must possess sufficient strength and deformation capacity, without melting, breaking, or leakage. Assembly must be simple; the sheath should fit as closely as possible to the components, minimizing all possible gaps, ensuring that minimal deformation during temperature and pressure increases is sufficient to enclose the workpieces to be welded. The sheath design must also consider the heat-affected zone during welding to prevent temperature conduction into the components and causing oxidation. However, currently, there is a lack of a suitable sheath device for hot isostatic pressure diffusion welding of hemispherical workpieces that can effectively conduct pressure, prevent leakage, is easy to assemble, and is easy to remove. Summary of the Invention

[0004] The purpose of this invention is to provide a sheathing device for hot isostatic diffusion welding of hemispherical workpieces, which can achieve precise connection of the workpieces to be welded, with high connection strength. After welding, there is no adhesion between the workpiece and the sheath, which can be easily removed. After removal, the surface condition is good and no secondary processing is required.

[0005] According to one objective of the present invention, the present invention provides a cladding device for hot isostatic diffusion welding of hemispherical workpieces, comprising an inner cladding, an outer cladding, and an extraction pipe, wherein the inner cladding can be embedded in the outer cladding to form a cavity for accommodating the hemispherical workpiece to be welded, and the extraction pipe is connected to the side wall of the inner cladding.

[0006] Furthermore, both the outer sleeve and the inner sleeve are hemispherical shell structures, and each of the sidewall edges of the outer sleeve and the inner sleeve is provided with a flange. The radius of the inner sleeve is smaller than the radius of the outer sleeve.

[0007] Furthermore, the distance between the inner sleeve and the outer sleeve is equal to the sum of the wall thicknesses of the two hemispherical shell-shaped workpieces to be welded and the wall thickness of the isolation layer.

[0008] Furthermore, an isolation layer is provided between the hemispherical shell-shaped workpiece to be welded and the outer sleeve and the inner sleeve.

[0009] Furthermore, the flange on the inner sleeve is provided with a reserved hole, and the air extraction pipe is welded to the reserved hole.

[0010] Furthermore, a pad is provided between the outer sleeve and the inner sleeve.

[0011] Furthermore, the pad has a circular structure, and the height of the pad is equal to the distance between the outer sleeve and the inner sleeve.

[0012] Furthermore, after the pad is placed between the outer sleeve and the inner sleeve, one end of the pad contacts the bottom of the hemispherical shell-shaped workpiece to be welded, and the other end of the pad contacts the inner wall of the flange of the inner sleeve.

[0013] Furthermore, the suction pipe is a stainless steel pipe, and the connection between the suction pipe and the inner sleeve is directly opposite the pad.

[0014] Furthermore, the pad is a stainless steel pad.

[0015] The technical solution of this invention can achieve a precise connection when welding two hemispherical shell-shaped workpieces. There is no gas or other impurities at the joint, the connection strength is extremely high, and there is no adhesion between the other surfaces of the workpiece and the sleeve after welding. It can be easily removed, and the surface condition after removal is good, requiring no secondary processing. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 2 This is another structural schematic diagram of an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of an embodiment of the present invention;

[0020] Figure 4 This is an embodiment of the present invention. Figure 3 A magnified view of a section at point A in the middle;

[0021] Figure 5This is an exploded structural diagram of the outer sheath, inner sheath, and pad block according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the isolation layer structure according to an embodiment of the present invention;

[0023] In the figure, 1. Inner sleeve; 2. Outer sleeve; 3. Pad; 4. Isolation layer; 5. Evacuation pipe; 6. Flange; 7. Hemispherical shell-shaped workpiece to be welded; 8. Reserved hole. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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 limiting this invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may 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.

[0027] Example 1

[0028] like Figures 1-6 As shown,

[0029] A sheathing device for hot isostatic diffusion welding of hemispherical shell workpieces includes an inner sheath 1, an outer sheath 2, a pad 3, an isolation layer 4, and an extraction pipe 5, wherein:

[0030] Both the outer sleeve 2 and the inner sleeve 1 are hemispherical shell structures. The sidewall edges of both the outer sleeve 2 and the inner sleeve 1 are provided with a flange 6. The radius of the inner sleeve 1 is smaller than the radius of the outer sleeve 2. The inner sleeve 1 can be embedded into the outer sleeve 2 to form a cavity for accommodating the hemispherical workpiece. The distance between the inner sleeve 1 and the outer sleeve 2 is equal to the sum of the wall thickness of the two hemispherical shell workpieces 7 to be welded and the wall thickness of the isolation layer 4.

[0031] A pre-drilled hole 8 is provided on the flange 6 of the inner sleeve 1, and the air extraction pipe 5 is welded to the pre-drilled hole 8 of the inner sleeve 1.

[0032] The pad 3 has a circular structure and can be placed between the outer sleeve 2 and the inner sleeve 1. Its height is equal to the distance between the outer sleeve 2 and the inner sleeve 1. After the pad 3 is placed between the outer sleeve 2 and the inner sleeve 1, one end contacts the bottom of the hemispherical workpiece 7 to be welded, and the other end contacts the inner wall of the flange 6 of the inner sleeve 1. The pad 3 is used to ensure the size of the hemispherical workpiece.

[0033] An isolation layer 4 is provided between the hemispherical shell-shaped workpiece 7 to be welded and the outer sleeve 2 and the inner sleeve 1, and the isolation layer is used for transition.

[0034] After the hemispherical shell-shaped workpiece 7 to be welded is assembled with the isolation layer 4, the pad 3, the outer sleeve 2 and the inner sleeve 1, the flanges 6 of the outer sleeve 2 and the inner sleeve 1 are welded to seal the entire sleeve device. Leak detection and venting are only performed through the air extraction pipe 5.

[0035] In this embodiment, both the outer sleeve 2 and the inner sleeve 1 are composed of a hemispherical shell and a circular flange. The flange is used to ensure that the welding position is far away from the workpiece, prevent oxidation, and protect the workpiece.

[0036] The isolation layer 4 is determined according to the workpiece material. In order to fit the hemispherical workpiece, it is divided into 12 equal parts and a 5° notch is cut off in each part. A 10mm square is left in the middle of the isolation layer.

[0037] The pad 3 is made of stainless steel and is placed at the ports of the outer sleeve 2 and the inner sleeve 1.

[0038] The evacuation pipe 5 is made of stainless steel and its connection with the inner sleeve 1 is directly opposite the stainless steel pad to prevent the parts from being squeezed into the evacuation pipe during the hot isostatic pressing process, and also to prevent the parts from deforming.

[0039] In the welding of the first hemispherical shell workpiece and the second hemispherical shell workpiece, the present invention first pre-welds the two sections of the extraction pipe, and then pre-welds the reserved hole in the inner sleeve of the smaller diameter extraction pipe.

[0040] Then, the outer sleeve, isolation layer, first hemispherical shell workpiece, second hemispherical shell workpiece, isolation layer, and inner sleeve are assembled from the outside to the inside. The isolation layer and pad are installed at the spherical shell ports of the outer sleeve and inner sleeve. Then, the flanges of the outer sleeve and inner sleeve are pre-welded. Finally, the entire sleeve device is fixed, and all pre-welded parts are fully welded. The sleeve device is finally sealed, leaving only the air extraction pipe port for subsequent evacuation and exhaust.

[0041] This invention achieves precise connection and high joint strength when welding two hemispherical shells. After welding, other surfaces of the workpiece are not adhered to the sheath due to the presence of the insulating layer, allowing for easy removal with a good surface finish, eliminating the need for secondary processing. Furthermore, it can be applied to welding various combinations of dissimilar metals, making it widely applicable.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sheathing device for hot isostatic diffusion welding of hemispherical shell workpieces, characterized in that, The device includes an inner sleeve, an outer sleeve, and a suction pipe. The inner sleeve is embedded within the outer sleeve to form a cavity for accommodating a hemispherical workpiece to be welded. The suction pipe is connected to the side wall of the inner sleeve. Both the outer sleeve and the inner sleeve are hemispherical structures, and each side wall edge of the outer sleeve and the inner sleeve has a flange. The radius of the inner sleeve is smaller than the radius of the outer sleeve. An isolation layer is provided between the hemispherical workpiece to be welded and the outer sleeve and the inner sleeve. A spacer is provided between the outer sleeve and the inner sleeve. The spacer has a circular structure, and its height is equal to the distance between the outer sleeve and the inner sleeve. After the spacer is placed between the outer sleeve and the inner sleeve, one end of the spacer contacts the bottom of the hemispherical workpiece to be welded, and the other end of the spacer contacts the inner wall of the flange of the inner sleeve.

2. The sheathing device for hot isostatic diffusion welding of hemispherical shell workpieces according to claim 1, characterized in that, The distance between the inner sleeve and the outer sleeve is equal to the sum of the wall thicknesses of the two hemispherical shell-shaped workpieces to be welded and the wall thickness of the isolation layer.

3. The sheathing device for hot isostatic diffusion welding of hemispherical shell workpieces according to claim 1, characterized in that, The flange on the inner sleeve is provided with a reserved hole, and the air extraction pipe is welded to the reserved hole.

4. The sheathing device for hot isostatic diffusion welding of hemispherical shell workpieces according to claim 1, characterized in that, The suction pipe is made of stainless steel, and the connection between the suction pipe and the inner sleeve is directly opposite the pad.

5. The sheathing device for hot isostatic diffusion welding of hemispherical shell workpieces according to claim 1, characterized in that, The pad is a stainless steel pad.

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