End cover processing method, end cover and pipeline assembly

Abstract

A method for machining an end cover including an annular member (10), the method using a powder metallurgy material to fabricate the annular member. The end cover is further disclosed. A pipeline assembly is further disclosed, the end cover includes a first pipeline (40), a second pipeline (50) and an end cover, the end cover includes an annular member, the inner wall of the annular member is connected to the outer wall of the first pipeline, and the outer wall of the annular member is connected to the inner wall of the second pipeline. When the annular member is fabricated using a powder metallurgy material, the porous properties of the powder can be fully utilized to increase the surface roughness, and at the same time, it is favorable for the wetting of the welding material, and the molten welding material can smoothly penetrate into the welding contact surface with the first pipeline and the second pipeline, so that the welding effect between the inner wall of the annular member and the first pipeline and the welding effect between the outer wall of the annular member and the second pipeline are improved. This end cover machining method solves the problem of poor welding effect between the machined material and the first pipeline and the second pipeline.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on January 27, 2022, bearing application number 202210102097.1 and titled "End cover processing method, end cover and pipeline assembly", and to a patent application filed with the State Intellectual Property Office of China on January 27, 2022, bearing application number 202220233667.6 and titled "End cover and pipeline assembly".

[0002] The present application relates to the technical field of cooling equipment, and in particular to an end cover processing method, an end cover and a pipeline assembly. [Background technology]

[0003] In the prior art, end covers are usually made by machining stainless steel bars, which results in high processing costs; when welding, the tolerance of the pipeline is large (approximately 1% of the pipe diameter) and there is an interference fit between the end cover and the pipeline, which results in poor welding effect; and in order to increase the welding contact area between the end cover and the pipeline, it is necessary to perform knurling on the end cover or the pipeline, which increases manufacturing costs. Summary of the Invention

[0004] The present application provides an end cover processing method, an end cover and a pipeline assembly to solve the problem of poor welding effect of the end cover in the prior art.

[0005] In order to solve the above problems, according to one aspect of the present application, the present application provides a method for processing an end cover including an annular member, the method including fabricating the annular member using a powder metallurgy material.

[0006] Alternatively, the end cover further includes a first end plate, the first end plate being an annular structure, and the end cover processing method further includes fabricating the first end plate using a plate material and brazing the first end plate to one side of the annular member using a welding material.

[0007] Furthermore, the welding material is a metal foil located between the annular member and the first end plate, and fabricating the annular member using the powder metallurgy material includes extruding the powder metallurgy material to form the shape of the annular member, and brazing the first end plate to one side of the annular member includes heating the annular member, the first end plate and the metal foil together, and during the process of sintering and forming the annular member, the metal foil melts to realize a brazing connection between the annular member and the first end plate.

[0008] Alternatively, the welding material is a metal foil located between the annular member and the first end plate, and fabricating the annular member using the powder metallurgical material includes sintering the powder metallurgical material to form the annular member, and brazing the first end plate to one side of the annular member includes heating the annular member, the first end plate and the metal foil together after sintering and forming the annular member to achieve a brazing connection between the annular member and the first end plate.

[0009] Alternatively, the welding material is a powder material, and preparing the annular member using the powder metallurgy material includes mixing the welding material into the powder metallurgy material and extruding it to form the shape of the annular member, and brazing the annular member to the first end plate includes heating both the first end plate and the annular member mixed with the welding material, and during the process of sintering and molding the annular member, the molten welding material diffuses to the surface of the annular member to realize a brazing connection between the annular member and the first end plate.

[0010] Alternatively, the welding material is a powder material, and preparing the annular member using the powder metallurgy material includes mixing the welding material with the powder metallurgy material to sinter-form the annular member, and during the process of sinter-forming the annular member, the welding material melts and diffuses to the surface of the annular member, and brazing the annular member to the first end plate includes heating the annular member, the first end plate and the welding material together after sintering the annular member to achieve a brazing connection between the annular member and the first end plate.

[0011] Furthermore, in the mixture of the welding material and the powder metallurgy material, the mass fraction of the welding material is greater than 3%.

[0012] Alternatively, the end cover further includes a second end plate, the second end plate being annular in structure, and the end cover processing method further includes fabricating the second end plate using a plate material and brazing the second end plate to the other side of the annular member using a welding material.

[0013] Additionally, the first endplate and the second endplate may be stamped or laser cut.

[0014] Additionally, the density of the first endplate and the second endplate is greater than the density of the annular member.

[0015] Furthermore, the melting point of the welding material is lower than the melting points of the annular member and the first end plate, the material of the annular member is an iron-based alloy, a nickel-based alloy, or a copper-based alloy, the material of the first end plate is an iron-based alloy, a nickel-based alloy, or a copper-based alloy, and the material of the welding material is an iron-based alloy, a nickel-based alloy, a copper-based alloy, or a tin-based alloy.

[0016] According to another aspect of the present application, there is provided an end cover machined using the end cover machining method described above.

[0017] Further, the end cover includes a first end plate and a welding material, the first end plate has an annular structure, the first end plate has a first positioning post, the annular member has a first positioning groove, the first positioning post fits into the first positioning groove, and the first end plate and one side of the annular member are brazed and connected by the welding material.

[0018] Furthermore, the end cover further includes a second end plate, the second end plate has an annular structure, the second end plate has a second positioning post, the annular member has a second positioning groove, the second positioning post fits into the second positioning groove, and the second end plate and the other side of the annular member are brazed and connected.

[0019] Additionally, the outer wall of the annular member has an annular step, with the area between the annular step and the second end plate being used for placement of weld material.

[0020] Further, the outer diameter of the first end plate is greater than the outer diameter of the annular member, the outer diameter of the annular member is equal to the outer diameter of the second end plate, the inner diameter of the first end plate is equal to the inner diameter of the annular member, and the inner diameter of the annular member is greater than the inner diameter of the second end plate.

[0021] Furthermore, the welding material is a metal foil, and the metal foil is fabricated by processing alone, or the metal foil and the first end plate are an integral structure, and the metal foil is a plated layer on the first end plate, or the metal foil and the first end plate are a rolled composite plate material.

[0022] According to another aspect of the present application, there is provided a pipeline assembly including a first pipeline, a second pipeline and an end cover as described above, the end cover including an annular member, an inner wall of the annular member being welded to an outer wall of the first pipeline and an outer wall of the annular member being welded to an inner wall of the second pipeline.

[0023] By applying the technical aspects of the present application, a method for processing an end cover including an annular member is provided, which includes fabricating the annular member using a powder metallurgy material. By fabricating the annular member using a powder metallurgy material using this aspect, the porous characteristics of the powder can be fully utilized to increase the surface roughness, and at the same time, it is advantageous for the moistening of the welding material, and the molten welding material can smoothly penetrate into the welding contact surface with the first pipeline and the second pipeline, thereby improving the welding effect between the inner wall of the annular member and the first pipeline, and the welding effect between the outer wall of the annular member and the second pipeline. By using the end cover processing method of this aspect, the problem of poor welding effect between the machined material and the first pipeline and the second pipeline is solved. [Brief description of the drawings]

[0024] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0025] [Figure 1] FIG. 2 shows a cross-sectional view of an end cover provided by Example 2 of the present application. [Diagram 2] FIG. 13 shows a cross-sectional view of an end cover provided by Example 3 of the present application. [Diagram 3] FIG. 13 shows a cross-sectional view of an end cover provided by Example 4 of the present application. [Figure 4] 1 shows a cross-sectional view of an end cover provided by Example 5 of the present application. [Diagram 5] 1 shows a cross-sectional view of a pipeline assembly provided by Example 6 of the present application.

[0026] Here, the above drawings include the following reference numbers: 10 annular member, 11 first positioning groove, 12 second positioning groove, 13 annular step, 20 first end plate, 21 first positioning post, 30 second end plate, 31 second positioning post, 40 first pipeline, 50 second pipeline. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are merely some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is actually merely explanatory, and does not impose any restrictions on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0028] Example 1 of the present application provides a method for fabricating an end cover including an annular member 10, the method including fabricating the annular member 10 using a powder metallurgy material.

[0029] The above-mentioned connection method is welding. When the annular member 10 is made using powder metallurgy material in this embodiment, the porous characteristics of the powder can be fully utilized to increase the surface roughness, and at the same time, it is also favorable for the moistening of the welding material, and the molten welding material can smoothly penetrate into the welding contact surface with the first pipeline 40 and the second pipeline 50, so that the welding effect between the inner wall of the annular member 10 and the first pipeline 40 and the welding effect between the outer wall of the annular member and the second pipeline 50 are improved. When the end cover processing method of this embodiment is used, the problem of poor welding effect between the machined material and the first pipeline 40 and the second pipeline 50 is solved. Specifically, the inner wall of the annular member 10 is used to connect to the outer wall of the first pipeline 40, and the outer wall of the annular member 10 is used to connect to the inner wall of the second pipeline 50.

[0030] Alternatively, the end cover further includes a first end plate 20, the first end plate 20 being an annular structure, and the end cover processing method further includes: fabricating the first end plate 20 using a plate material, and brazing the first end plate 20 to one side of the annular member 10 using a welding material. By brazing the first end plate 20 to one side of the annular member 10 using a welding material and fabricating the first end plate 20 from a plate material, the sealing property of the one side of the annular member 10 can be strengthened, and the problems of the risk of leakage and low pressure resistance that exist due to the annular member 10 being fabricated from a powder metallurgy material can be solved.

[0031] Here, the welding material is a metal foil located between the annular member 10 and the first end plate 20, making the annular member 10 using the powder metallurgy material means extruding the powder metallurgy material to form the shape of the annular member 10, and brazing the first end plate 20 to one side of the annular member 10 includes heating the annular member 10, the first end plate 20, and the metal foil together, and melting the metal foil during the process of sintering the annular member 10 to realize the brazing connection between the annular member 10 and the first end plate 20. The welding material is a metal foil and is located between the annular member 10 and the first end plate 20, and during the process of sintering the annular member 10, the annular member 10, the first end plate 20, and the metal foil together are heated, and the metal foil is melted by brazing to connect the annular member 10 and the first end plate 20, thereby solving the problems of low production efficiency and poor welding quality when using welding methods such as argon arc welding and laser welding.

[0032] Alternatively, the welding material is a metal foil located between the annular member 10 and the first end plate 20, and using the powder metallurgy material to prepare the annular member 10 is to sinter the powder metallurgy material to form the annular member 10, and brazing the first end plate 20 to one side of the annular member 10 includes heating the annular member 10, the first end plate 20, and the metal foil together after the annular member 10 is sintered to achieve a brazing connection between the annular member 10 and the first end plate 20. Using the above installation method, the welding material is a metal foil and is disposed between the annular member 10 and the first end plate 20, and after the annular member 10 is sintered, the annular member 10, the first end plate 20, and the metal foil together are heated to melt the metal foil by brazing to connect the annular member 10 and the first end plate 20, thereby solving the problems of low production efficiency and poor welding quality when using welding methods such as argon arc welding and laser welding.

[0033] Alternatively, the welding material is a powder material, and using the powder metallurgy material to prepare the annular member 10 is to mix the welding material with the powder metallurgy material and extrude it to form the shape of the annular member 10, and brazing the annular member 10 to the first end plate 20 includes heating the first end plate 20 and the annular member 10 mixed with the welding material together, and in the process of sintering the annular member 10, the molten welding material diffuses to the surface of the annular member 10 to realize the brazing connection between the annular member 10 and the first end plate 20. The welding material and the powder metallurgy material are mixed and extruded to form the shape of the annular member 10, and in the process of sintering the annular member 10, the first end plate 20 and the annular member 10 mixed with the welding material together are heated, and the molten welding material diffuses to the surface of the annular member 10 to realize the brazing connection between the first end plate 20 and the annular member 10. The above installation method can improve production efficiency and welding quality.

[0034] Alternatively, the welding material is a powder material, and using the powder metallurgy material to prepare the annular member 10 includes mixing the welding material with the powder metallurgy material to sinter the annular member 10, and in the process of sintering the annular member 10, the welding material melts and diffuses to the surface of the annular member 10, and brazing the annular member 10 to the first end plate 20 includes heating the annular member 10, the first end plate 20, and the welding material together after sintering the annular member 10 to realize the brazing connection between the annular member 10 and the first end plate 20. The welding material and the powder metallurgy material are mixed to form the shape of the annular member 10 by extrusion, and in the process of sintering the annular member 10, the molten welding material diffuses to the surface of the annular member 10, and then the first end plate 20, the welding material, and the sintered annular member 10 are heated together, so that the brazing connection between the annular member 10 and the first end plate 20 is realized. Using this installation method can improve production efficiency and improve welding quality.

[0035] Here, in the mixture of the welding material and the powder metallurgy material, the mass fraction of the welding material is greater than 3%. The mass fraction of the welding material in the mixture of the welding material and the powder metallurgy material is limited within the above numerical range, so that a sufficient amount of the welding material can be ensured to diffuse to the surface of the annular member 10, thereby ensuring the welding quality.

[0036] Alternatively, the end cover further includes a second end plate 30, the second end plate 30 being an annular structure, and the end cover processing method further includes fabricating the second end plate 30 using a plate material, and brazing the second end plate 30 to the other side of the annular member 10 using a welding material. By brazing the second end plate 30 to the other side of the annular member 10 using a welding material and fabricating the second end plate 30 from a plate material, the sealing property of the other side of the annular member 10 can be strengthened, and the problems of the annular member 10 having a risk of leakage and low pressure resistance can be further solved. Here, the welding method between the second end plate 30 and the annular member 10 is the same as the welding method between the first end plate 20 and the annular member 10, so a description thereof will be omitted here.

[0037] In this embodiment, the first endplate 20 and the second endplate 30 are stamped or laser cut. Any of the above methods can be used to complete the fabrication of the first endplate 20 and the second endplate 30.

[0038] Specifically, the density of the first end plate 20 and the second end plate 30 is greater than the density of the annular member 10. Since the density of the first end plate 20 and the second end plate 30 is greater than the density of the annular member 10, the structural strength can be satisfied and the sealing effect can be improved.

[0039] Specifically, the melting point of the welding material is lower than that of the annular member 10 and the first end plate 20, the material of the annular member 10 is an iron-based alloy, a nickel-based alloy or a copper-based alloy, the material of the first end plate 20 is an iron-based alloy, a nickel-based alloy or a copper-based alloy, and the material of the welding material is an iron-based alloy, a nickel-based alloy, a copper-based alloy or a tin-based alloy. By making the melting point of the welding material lower than that of the annular member 10 and the first end plate 20, it is possible to ensure that the annular member 10 and the first end plate 20 do not melt after the welding material melts, so that the brazing connection between the annular member 10 and the first end plate 20 is realized, and the above materials can be selected for the annular member 10, the first end plate 20 and the welding material, so that different materials can be selected according to the indexes such as thermal conductivity, friction coefficient, strength, toughness, etc. of the materials actually required, thereby solving the problem that the selection of materials is limited in the prior art. Here, the second end plate 30 and the first end plate 20 are made of the same material, and the annular member 10 is located between the second end plate 30 and the first end plate 20, but the second end plate 30 may select a different material according to actual needs.

[0040] As shown in Fig. 1, in Example 2 of the present embodiment, an end cover processed using the above end cover processing method is provided. When the annular member 10 manufactured by the above end cover processing method is connected to the first pipeline 40 and the second pipeline 50, the porous properties of the powder can be fully utilized to increase the surface roughness and at the same time increase the welding contact surface with the first pipeline 40 and the second pipeline 50, thereby improving the welding effect between the inner wall of the annular member 10 and the first pipeline 40 and the welding effect between the outer wall of the annular member and the second pipeline 50.

[0041] Optionally, the holes in the annular member 10 are straight holes or stepped holes.

[0042] As shown in FIG. 2, in the third embodiment of the present embodiment, the end cover includes a first end plate 20 and a welding material, the first end plate 20 is annular, the first end plate 20 has a first positioning post 21, the annular member 10 has a first positioning groove 11, the first positioning post 21 enters the first positioning groove 11, and the first end plate 20 and one side of the annular member 10 are brazed and connected by the welding material. By brazing the first end plate 20 and one side of the annular member 10 using the welding material, the sealing property of the one side of the annular member 10 can be strengthened, and the problems of the risk of leakage and low pressure resistance due to the annular member 10 being made of powder metallurgy material can be solved. Here, when the first end plate 20 has an annular structure, it can be matched to the shape of the annular member 10 and can be easily brazed and connected. By making the first positioning post 21 enter the first positioning groove 11, the first end plate 20 and the annular member 10 can be easily fixed. Here, since the first positioning pillar 21 and the first end plate 20 are of an integral structure, processing becomes easier and costs are reduced.

[0043] As shown in FIG. 3, in the fourth embodiment of the present invention, the end cover further includes a second end plate 30, the second end plate 30 is annular, the second end plate 30 has a second positioning post 31, the annular member 10 has a second positioning groove 12, the second positioning post 31 enters the second positioning groove 12, and the second end plate 30 and the other side of the annular member 10 are brazed together. By brazing the second end plate 30 and the other side of the annular member 10, the annular member 10 is located between the second end plate 30 and the first end plate 20, so that the pressure resistance of both sides of the annular member 10 is further enhanced, and the risk of leakage of the annular member 10 is effectively reduced. By making the second positioning post 31 enter the second positioning groove 12, the second end plate 30 and the annular member 10 are easily fixed together. Here, the second positioning post 31 and the second end plate 30 are integrally formed, so that the processing is facilitated and the cost is reduced.

[0044] 4, in Example 5 of the present embodiment, the outer wall of the annular member 10 has an annular step 13, and the area between the annular step 13 and the second end plate 30 is used for placing the welding material. By providing the annular step 13, the welding material can be placed, and at the same time, it is easy to braze the end cover to the engagement structure in the pipeline.

[0045] Specifically, the outer diameter of the first end plate 20 is larger than that of the annular member 10, the outer diameter of the annular member 10 is equal to that of the second end plate 30, the inner diameter of the first end plate 20 is equal to that of the annular member 10, and the inner diameter of the annular member 10 is larger than that of the second end plate 30. Using the above installation method, when the outer diameter of the first end plate 20 is larger than that of the annular member 10, it can play a restricting role when the outer wall of the annular member 10 is connected to the second pipeline 50, and when the inner diameter of the annular member 10 is larger than that of the second end plate 30, it can play a restricting role for the first pipeline 40 when the inner wall of the annular member 10 is connected to the first pipeline 40, so as to avoid the first pipeline 40 being inserted too deeply and affecting the flow of fluid.

[0046] Furthermore, the welding material is a metal foil, and the metal foil is produced by processing alone, or the metal foil and the first end plate 20 are an integral structure, and the metal foil is a plating layer on the first end plate 20, or the metal foil and the first end plate 20 are a rolled composite plate material. In this embodiment, the metal foil and the first end plate 20 are an integral structure, specifically, the metal foil is a plating layer on the first end plate 20, or the metal foil and the first end plate 20 are a rolled composite plate material, so that it is easy to fix the metal foil, and the structural strength and welding effect are improved.

[0047] As shown in FIG. 5, Example 6 of the present application provides a pipeline assembly including a first pipeline 40, a second pipeline 50 and the above-mentioned end cover, the end cover including an annular member 10, the inner wall of the annular member 10 being connected to the outer wall of the first pipeline 40, and the outer wall of the annular member 10 being connected to the inner wall of the second pipeline 50. Specifically, one end of the first pipeline 40 penetrates into the annular member 10 and is welded to the annular member 10, a part of the annular member 10 penetrates into the second pipeline 50 and is welded to the second pipeline 50, and the first pipeline 40 communicates with the second pipeline 50. Using this embodiment can improve the welding quality and reduce the processing cost.

[0048] The advantages of this embodiment are as follows: 1. The annular member 10 is formed by powder metallurgy, and takes advantage of the porous characteristics of the powder to increase the surface roughness, thereby solving the problem that it is difficult to weld the machining material with the pipeline. 2. The first end plate 20 and the second end plate 30 are dense plates that are brazed to both sides of the annular member 10 to achieve sealing; the middle annular member 10 made of powder metallurgy material is surrounded by the welding material, the first end plate 20 and the second end plate 30, thereby eliminating the risk of leakage and low pressure resistance that may occur due to the porosity of the powder metallurgy material; and the middle annular member 10 made of powder metallurgy material is not exposed to air or refrigerant. 3. In order to solve the limitations of material selection, the first end plate 20 and the second end plate 30 only need to use materials that can meet the performance requirements, and the intermediate annular member 10 made of powder metallurgy material is surrounded by the welding material, the first end plate 20 and the second end plate 30, so that materials such as iron-based, copper-based, nickel-based, etc. may be used.

[0049] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for processing an end cover including an annular member (10), comprising the steps of: and fabricating said annular member (10) using a powder metallurgical material.

2. The end cover further includes a first end plate (20), the first end plate (20) being an annular structure, A first end plate (20) is made using a plate material; brazing the first end plate (20) to one side of the annular member (10) using a welding material; The method of claim 1 further comprising:

3. the welding material is a metal foil located between the annular member (10) and the first end plate (20); Producing the annular member (10) using a powder metallurgical material comprises extruding a powder metallurgical material to form a shape of the annular member (10); 3. The end cover processing method of claim 2, wherein brazing the first end plate (20) to one side of the annular member (10) includes heating the annular member (10), the first end plate (20) and the metal foil together, and melting the metal foil during the process of sintering and molding the annular member (10), thereby achieving a brazing connection between the annular member (10) and the first end plate (20).

4. the welding material is a metal foil located between the annular member (10) and the first end plate (20); Producing the annular member (10) using a powder metallurgical material means sintering the powder metallurgical material to form the annular member (10); 3. The end cover processing method of claim 2, wherein brazing the first end plate (20) to one side of the annular member (10) includes heating the annular member (10), the first end plate (20) and the metal foil together after sintering the annular member (10) to achieve a brazing connection between the annular member (10) and the first end plate (20).

5. the welding material is a powder material; Producing the annular member (10) using a powder metallurgical material means mixing the welding material with a powder metallurgical material and extruding the mixture to form the shape of the annular member (10); 3. The end cover processing method of claim 2, wherein brazing the annular member (10) and the first end plate (20) includes heating the first end plate (20) and the annular member (10) mixed with the welding material together, and during the process of sintering and molding the annular member (10), the molten welding material diffuses to the surface of the annular member (10) to realize a brazing connection between the annular member (10) and the first end plate (20).

6. the welding material is a powder material; The manufacturing of the annular member (10) using a powder metallurgical material means mixing the welding material with the powder metallurgical material, sintering and forming the annular member (10), and in the process of sintering and forming the annular member (10), the welding material melts and diffuses to the surface of the annular member (10); 3. The end cover processing method of claim 2, wherein the brazing connection between the annular member (10) and the first end plate (20) includes heating the annular member (10), the first end plate (20) and the welding material together after sintering and molding the annular member (10) to achieve the brazing connection between the annular member (10) and the first end plate (20).

7. The end cover processing method according to claim 5 or 6, wherein in the mixture of the welding material and the powder metallurgical material, a mass fraction of the welding material is 3% or more.

8. The end cover further includes a second end plate (30), the second end plate (30) being an annular structure, Making a second end plate (30) using a plate material; brazing the second end plate (30) to the other side of the annular member (10) using a welding material; The method of claim 2 further comprising:

9. The method of claim 8, wherein the first end plate (20) and the second end plate (30) are stamp formed or laser cut formed.

10. The method of claim 8, wherein the density of the first end plate (20) and the second end plate (30) is greater than the density of the annular member (10).

11. 3. The end cover processing method according to claim 2, wherein the melting point of the welding material is lower than the melting points of the annular member (10) and the first end plate (20), the material of the annular member (10) is an iron-based alloy, a nickel-based alloy, or a copper-based alloy, the material of the first end plate (20) is an iron-based alloy, a nickel-based alloy, or a copper-based alloy, and the material of the welding material is an iron-based alloy, a nickel-based alloy, a copper-based alloy, or a tin-based alloy.

12. An end cover processed using the end cover processing method according to any one of claims 1 to 11.

13. The end cover of claim 12, wherein the end cover includes a first end plate (20) and a welding material, the first end plate (20) has an annular structure, the first end plate (20) has a first positioning post (21), the annular member (10) has a first positioning groove (11), the first positioning post (21) fits into the first positioning groove (11), and the first end plate (20) and one side of the annular member (10) are brazed and connected by the welding material.

14. The end cover of claim 13, further comprising a second end plate (30), the second end plate (30) being annular in structure, the second end plate (30) having a second positioning post (31), the annular member (10) having a second positioning groove (12), the second positioning post (31) fitting into the second positioning groove (12), and the second end plate (30) and the other side of the annular member (10) being brazed and connected.

15. 15. The end cover of claim 14, wherein the outer wall of the annular member (10) has an annular step (13), and the area between the annular step (13) and the second end plate (30) is used for placing the welding material.

16. 15. The end cover of claim 14, wherein an outer diameter of the first end plate (20) is greater than an outer diameter of the annular member (10), an outer diameter of the annular member (10) is equal to an outer diameter of the second end plate (30), an inner diameter of the first end plate (20) is equal to an inner diameter of the annular member (10), and an inner diameter of the annular member (10) is greater than an inner diameter of the second end plate (30).

17. the welding material is a metal foil; The metal foil may be produced by processing alone or Alternatively, the metal foil and the first end plate (20) are of one-piece construction, 14. The end cover of claim 13, wherein the metal foil is a plated layer on the first end plate (20) or the metal foil and the first end plate (20) are a rolled composite plate.

18. 18. A pipeline assembly comprising a first pipeline (40), a second pipeline (50) and an end cover as described in any one of claims 12 to 17, the end cover comprising an annular member (10), an inner wall of the annular member (10) connected to an outer wall of the first pipeline (40), and an outer wall of the annular member (10) connected to an inner wall of the second pipeline (50).

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