Dissimilar material joining method for titanium and solder for sealing vacuum container

Abstract

The present application relates to the technical field of soldering, and specifically discloses a dissimilar material joining method for titanium and solder for sealing a vacuum container. The joining method comprises: firstly, designing and preparing a metal transition segment; secondly, designing and preparing a cladding material; thirdly, selecting a cladding heat source and a cladding method, implementing cladding, and preparing a bimetallic layer; fourthly, punching the bimetallic layer to form a hole, and preparing a bimetallic layer punching structural part; fifthly, selecting a joining heat source and a joining method, implementing joining, and preparing a dissimilar material structural assembly for vacuum sealing; sixthly, using a soldering method to prepare a whole container; and seventhly, starting a vacuum furnace, and implementing vacuum sealing to prepare a vacuum container. The dissimilar material joining method provided by the present application has a simple joining process, high efficiency, a low cost, small stress and deformation, and can prevent a brittle structure from being formed; a formed combined connecting joint has good internal quality, high bonding strength, and good impact resistance, heat preservation efficiency and sealing performance; and the service life of the container is long.

Description

A method for connecting dissimilar materials of titanium metal and solder for sealing vacuum containers

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 25, 2023, with application number CN202311792427.5 and invention name “A method for connecting dissimilar materials of titanium metal and solder for sealing vacuum containers”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of welding technology, and in particular relates to a method for connecting dissimilar materials of titanium metal and solder for sealing vacuum containers. Background Art

[0003] Vacuum containers include vacuum cups (bottles, pots), vacuum pressure kettles, vacuum lunch boxes, vacuum stew pots, vacuum components, and other products with vacuum layer structures. Due to their diverse variety and ease of use, vacuum containers have gained widespread application in production and daily life. Among them, vacuum cups (bottles, pots) are vacuum insulation containers used to store hot and cold water, beverages, and other liquids with heat preservation functions; vacuum pressure kettles are vacuum insulation containers used to store hot and cold water with a pressure-discharging function; vacuum lunch boxes are vacuum insulation containers used to store food such as rice, vegetables, and soup, and can be equipped with an inner box; vacuum stew pots are vacuum insulation containers used to stew food, and the inner pot can be removed for heating; vacuum components refer to the non-independent vacuum structured part of daily utensils that comes into contact with food, and are composed of an inner liner and an outer shell.

[0004] Current vacuum containers are mainly made of stainless steel. However, stainless steel vacuum containers have obvious disadvantages. First, stainless steel usually contains heavy metal elements such as nickel, chromium, manganese, cadmium, and lead. When used to hold acidic or salty liquids such as juice and soup, heavy metals will precipitate from the stainless steel, which will not only make the drinks lose their flavor and deteriorate, but also enter the human body through drinking. Long-term use will pose serious health risks. Second, acidic and alkaline liquids are easy to corrode stainless steel, shortening the service life of the insulation container. In addition, the high density of stainless steel makes the vacuum container heavy and inconvenient to carry in the wild. These greatly limit the applicability of stainless steel vacuum containers.

[0005] At present, vacuum containers mainly made of titanium metal can overcome the shortcomings of stainless steel containers. First, the chemical properties of titanium are stable. At room temperature, titanium combines with oxygen to form an extremely thin and dense oxide film. The corrosion resistance of this oxide film is far better than that of stainless steel. It can hold daily carbonated beverages, tea, juice and even Chinese medicine and other liquids, and it is not easy to precipitate heavy metals; secondly, titanium is friendly to the human body, and titanium metal is "biophilic"; thirdly, titanium metal has the characteristics of high strength and low density, and weighs about 43% lighter than stainless steel of the same volume. It is solid, durable and easy to carry; finally, titanium metal is corrosion-resistant and has a long service life.

[0006] However, it is difficult to vacuum seal titanium vacuum containers. At present, there are two main methods. One method is to use a direct sealing method, open a vacuum hole at the bottom of the container, and seal it with solder after vacuuming. At present, there are two types of solders used. One is metal solder (metal brazing filler metal), such as Ag-Cu-Ti alloy. After the metal solder is melted, liquid metal is formed to wet the metal surface to achieve brazing. The other is oxide solder (oxide brazing filler metal), which is an inorganic solder. The glass phase formed after the oxide solder is melted wets the metal surface to achieve brazing connection. However, when these two types of solders (brazing filler metals) are used for titanium metal sealing, due to the poor chemical compatibility between the solder and titanium metal, the physical properties are quite different, the wettability is poor, the bonding strength is low, the impact resistance is poor, the sealing effect is poor, and it is easy to crack on the titanium alloy, making it impossible to maintain a vacuum state for a long time, the thermal insulation effect is poor, and the service life is short; the other method is to use an indirect sealing method. The joint sealing method uses stainless steel as a transition material. First, stainless steel and titanium alloy are brazed, and then the stainless steel and the solder are vacuum sealed. This indirect connection method improves the sealing performance to a certain extent. However, first of all, due to the presence of two brazings, the temperature of the second brazing is difficult to increase, and high-temperature vacuuming cannot be achieved. If the brazing sealing temperature is increased, it will affect the brazing effect of stainless steel and titanium alloy, and generate stress and deformation at the connection between stainless steel and titanium alloy, reduce the bonding strength and sealing, and even cause cracking. Therefore, this indirect method cannot achieve high-temperature sealing. Since the higher the sealing temperature, the higher the vacuum degree of the prepared vacuum container, it is difficult to meet the high vacuum degree requirements; secondly, due to the use of two brazings, the brazing efficiency is low, the cost is high, and the process is complicated; finally, the obtained combined brazed joint has poor impact resistance, poor sealing, short vacuum maintenance time, poor thermal insulation performance, and short service life.

[0007] In summary, key industry issues that need to be addressed urgently include how to efficiently and massively achieve the dissimilar material joining of titanium metal and solder in order to reduce costs, how to reduce the large stress and deformation caused by the large difference in physical properties between titanium metal and solder, and how to improve the low joint strength, poor impact resistance, poor container insulation performance, poor sealing, and short service life caused by the poor chemical compatibility and wettability between titanium metal and solder. In order to solve these dissimilar material joining problems, new joining methods, processes, and materials are needed to form new technologies for the joining of dissimilar materials between titanium metal and solder.

[0008] Summary of the Invention

[0009] In view of the problems that the connection process of dissimilar materials between titanium metal and solder used for vacuum container sealing is complex, inefficient, high cost, easy to produce brittle structure, large stress and deformation, easy to crack, easy to produce connection defects, low bonding strength, poor impact resistance, poor thermal insulation performance, poor sealing, short service life, and difficulty in achieving high-temperature brazing sealing, this application proposes a method for connecting dissimilar materials between titanium metal and solder used for vacuum container sealing.

[0010] In order to achieve the above-mentioned purpose of the invention, this application is implemented by adopting the following technical solutions:

[0011] A method for connecting dissimilar materials of titanium metal and solder for sealing a vacuum container comprises the following steps:

[0012] (1) Designing and preparing a metal transition section B based on the composition, physical and chemical properties of the titanium metal A to be connected, wherein the metal transition section B is required to have good chemical compatibility with the titanium metal A;

[0013] (2) Designing and preparing a cladding material R based on the composition, physical and chemical properties of the metal transition section B and the solder D, wherein the cladding material R is required to have good plasticity, good chemical compatibility with the metal transition section B, and good wettability with the solder D;

[0014] (3) selecting a suitable cladding heat source and determining a corresponding cladding method, setting heat source process parameters, starting the heat source equipment, and locally cladding the surface of the metal transition section B using the cladding material R to prepare a cladding layer C, thereby forming a bimetallic layer L consisting of the cladding layer C and the metal transition section B;

[0015] (4) The surface of the cladding layer C is polished, and a stamping device is used to stamp the bimetallic layer L from one side of the cladding layer C. The bimetallic layer L is recessed and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W;

[0016] (5) selecting a suitable connection heat source and determining a corresponding connection method, setting heat source process parameters, starting the heat source equipment, and connecting the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W to prepare a heterogeneous material structural component S for vacuum sealing;

[0017] (6) Using a welding method, the vacuum sealing heterogeneous material structural component S is connected to other parts of the container into a whole to form a container V;

[0018] (7) The solder D is placed on the punched hole formed after the bimetallic layer of the container V is punched, and then the container V is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D and the container V are vacuum sealed to prepare a vacuum container.

[0019] This application uses an indirect connection method to achieve the connection between titanium metal and solder. First, a metal transition section is designed and prepared, and various cladding methods are used to perform local cladding on the metal transition section to prepare a bimetallic layer. Second, a stamping device is used to stamp the bimetallic layer to prepare a bimetallic layer stamped structural part with a vacuum hole. Third, various welding methods are used to achieve the melting connection between the titanium metal and the metal transition section of the bimetallic layer stamped structural part by adding or not adding welding wire. Finally, a vacuum furnace device is used to achieve the brazing connection between the solder and the cladding layer. This application combines additive manufacturing technology (surface modification technology), dissimilar metal connection technology, and dissimilar material brazing technology to form a new type of dissimilar material connection technology, and prepares a titanium metal-metal transition layer-cladding layer-solder connection structure. This combined connection method has a simple process, low cost, high connection efficiency, good quality of the combined connection joint, and high comprehensive performance.

[0020] The basic principle of a dissimilar material joining method for titanium metal and solder used for vacuum container sealing is as follows:

[0021] First, a metal transition section B is designed based on the composition, physical, and chemical properties of the titanium metal A to be connected. This metal transition section B must exhibit good chemical compatibility with the titanium metal A. If welding wire H is used to connect titanium metal A and metal transition section B, this must also be chemically compatible with both. Due to the significant differences in thermophysical properties, such as the linear expansion coefficient, between titanium metal A and solder D, chemical compatibility and wettability are poor. Direct brazing of titanium metal A and solder D results in low bond strength, high joint stress, poor performance, and susceptibility to cracking. Therefore, an indirect connection using metal transition section B is necessary. If no welding material is added, the good chemical compatibility between the metal transition section B and the titanium metal A can prevent the formation of brittle structures such as intermetallic compounds at the connection joint between the titanium metal A and the metal transition section B. If welding wire H is used, the good chemical compatibility between the titanium metal A, the metal transition section B and the welding wire H can also prevent the formation of brittle structures at the connection joint between the titanium metal A and the metal transition section B, which would cause the weld performance to deteriorate or even crack.

[0022] Second, the cladding material R is designed based on the composition, physical, and chemical properties of the metal transition section B and solder D. The cladding material R is required to have good plasticity, good chemical compatibility with the metal transition section B, and good wettability with the solder D. Due to the significant difference in physical properties between the metal transition section B and the solder D, as well as poor chemical compatibility and wettability, a direct connection between the metal transition section B and solder D is not possible. Cladding is required on a localized area of ​​the metal transition section B to create a cladding layer C before connecting to the solder D. First, the cladding material R used has good plasticity and low yield strength, and the prepared cladding layer C has good plasticity and ductility, so that the cladding layer C can be deformed under low stress. At the same time, the plastic deformation temperature of the cladding layer C is close to the softening temperature of the solder, thereby significantly reducing the stress during brazing of the cladding layer C and the solder D, avoiding cracking; secondly, the cladding material R used has good chemical compatibility with the metal transition section B, so that the cladding layer C and the base of the metal transition section B achieve good metallurgical bonding, without intermetallic compounds. The formation of brittle structures is prevented to avoid cracking; secondly, the cladding material R and the solder D have good wettability, so that the solder D can spread well on the cladding layer C after melting, and the cladding layer C and the solder D achieve a good brazing bond; finally, the cladding material R used has good plasticity, the prepared cladding layer C has good plasticity and ductility, and the plasticity and strength of the metal transition section B are also moderate, so that the prepared bimetallic layer has excellent comprehensive mechanical properties and excellent stamping performance, which meets the requirements of the next stamping process. When stamping, a precise stamping shape can be obtained.

[0023] Third, select a suitable cladding heat source and determine the corresponding cladding method, using cladding material R to partially clad the surface of the metal transition section B. Cladding is performed using a consumable arc heat source, a non-consumable arc heat source, a plasma arc heat source, a laser heat source, or a laser + arc composite heat source and the corresponding cladding method. Due to the good chemical compatibility (i.e., metallurgical compatibility) between the metal transition section B and the cladding material R, brittle structures and cracks can be avoided. By adopting a suitable cladding method and adding the matching cladding material R, high-quality cladding can be achieved.

[0024] Fourth, a stamping machine is used to prepare a bimetallic layer stamped structural component. The surface of the cladding layer C is polished, and the bimetallic layer is stamped from the cladding layer C side using a stamping machine. Due to the good plasticity of the cladding layer and the good strength and plasticity of the metal transition section as the base layer, the prepared bimetallic layer has appropriate plasticity and strength, excellent overall performance, and meets the requirements of the stamping process. After stamping, the bimetallic layer is concave and a small stamping hole is formed in the center, that is, a vacuum hole, thereby preparing a bimetallic layer stamped structural component.

[0025] Fifth, a suitable connection heat source is selected and a corresponding connection method is determined to connect the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W to prepare a dissimilar material structural component S for vacuum sealing. A consumable arc heat source, a non-consumable arc heat source, a plasma arc heat source, an electron beam heat source, a laser heat source, or a laser + arc composite heat source and a corresponding connection method are used for connection to achieve a fusion welding connection. Since the metal transition section B has good chemical compatibility with the titanium metal A, that is, good weldability, if a welding wire H is added, the chemical compatibility of the welding wire H with both the titanium metal A and the metal transition section B is good, so that high-quality dissimilar metal connections can be achieved by adopting a suitable connection method, whether or not a welding wire is added, and the generation of brittle structure and weld cracking can be avoided, and the overall performance of the connection joint is good.

[0026] Sixth, the heterogeneous material structural component S is connected to other parts of the container by welding to form a whole, forming a container V for vacuum sealing in the next step.

[0027] Seventh, perform dissimilar material vacuum sealing on the solder D and the cladding layer of the bimetallic layer stamped structural component of the container V. Solder D is placed at the small hole formed after stamping the bimetallic layer of the container V. The container V is then placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the vacuum furnace is evacuated. When the vacuum sealing temperature is reached, the temperature is maintained until the solder D is completely melted and completely blocks the stamped small hole. The temperature is then reduced to cool, completing the container vacuum sealing. On the one hand, due to the good wettability of solder D and the cladding layer C prepared by cladding material R, the solder D can be well spread on the cladding layer C after melting, thereby improving the bonding strength; on the other hand, although there is a certain difference in the linear expansion coefficient of the cladding layer C and the solder D, which will produce a certain residual stress, the cladding layer has good plasticity and ductility and low yield strength, and the plastic deformation temperature of the cladding layer C is close to the softening temperature of the solder D. Therefore, during the brazing process, the cladding layer C can be deformed under low stress, thereby significantly reducing or even eliminating the residual stress, so that the bonding strength between the solder D and the cladding layer C is high and no cracking will occur.

[0028] The present application also provides a dissimilar material structural component for vacuum sealing, which is formed by connecting a bimetallic layer stamping structural member W with a titanium metal A;

[0029] The bimetallic stamping structure W is obtained by stamping a bimetallic layer L. The stamping is performed from one side of the cladding layer C of the bimetallic layer L. The bimetallic layer L is recessed and a small punching hole is formed in the center.

[0030] The bimetallic layer L is composed of a cladding layer C and a metal transition section B. The cladding layer C is prepared by partially cladding the surface of the metal transition section B with a cladding material R.

[0031] The material of the metal transition section 1 has good chemical compatibility with the material of the titanium metal 4;

[0032] The material of the cladding layer 2 has good plasticity and good chemical compatibility with the material of the metal transition section 1 .

[0033] Preferably, the connection method is butt joint and overlap joint;

[0034] When the connection method is butt-jointing, a butt weld 5 is further included between the titanium metal 4 and the outer edge;

[0035] When the connection method is overlapping, a lap weld 6 is further provided between the titanium metal 4 and the outer edge.

[0036] The present application also provides a method for preparing the heterogeneous material structural assembly described in the above technical solution, comprising the following steps:

[0037] (1) Designing and preparing a metal transition section B based on the composition, physical and chemical properties of the titanium metal A to be connected, wherein the metal transition section B is required to have good chemical compatibility with the titanium metal A;

[0038] (2) Designing and preparing a cladding material R based on the composition, physical and chemical properties of the metal transition section B and the solder D, wherein the cladding material R is required to have good plasticity, good chemical compatibility with the metal transition section B, and good wettability with the solder D;

[0039] (3) selecting a suitable cladding heat source and determining a corresponding cladding method, setting heat source process parameters, starting the heat source equipment, and locally cladding the surface of the metal transition section B using the cladding material R to prepare a cladding layer C, thereby forming a bimetallic layer L consisting of the cladding layer C and the metal transition section B;

[0040] (4) The surface of the cladding layer C is polished, and a stamping device is used to stamp the bimetallic layer L from one side of the cladding layer C. The bimetallic layer L is recessed and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W;

[0041] (5) Selecting a suitable connection heat source and determining a corresponding connection method, setting heat source process parameters, starting the heat source equipment, and connecting the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W to prepare a heterogeneous material structural component for vacuum sealing.

[0042] Compared with the existing technology, since the present application organically combines additive manufacturing technology (surface modification technology), dissimilar metal connection technology and dissimilar material brazing technology, it can solve the connection problems caused by poor chemical compatibility between titanium metal and solder, large differences in physical properties, poor wettability, etc. The beneficial effects of the dissimilar material connection method of titanium metal and solder for vacuum container sealing provided by the present application are low connection cost, simple connection process, high connection efficiency, good connection flexibility, small stress and deformation, and can avoid coarse grains in the heat-affected zone, can avoid the formation of brittle structure at the cladding interface and the fusion welding joint, can eliminate various cladding and connection defects, the internal quality of the cladding layer and the fusion welding joint is excellent, the cladding interface and the fusion welding connection joint have high bonding strength, the brazing sealing joint has high bonding strength and good sealing performance, so that the formed combined connection joint of titanium metal and solder has good internal quality, high bonding strength, good impact resistance, thermal insulation performance and sealing of the combined connection joint, and long container service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is a flow chart of dissimilar materials connection between titanium metal and solder for vacuum container sealing;

[0044] FIG2 is a front view of a bimetallic layer L formed after partial cladding on the surface of the metal transition section B;

[0045] FIG3 is a top view of a bimetallic layer L formed after partial cladding on the surface of the metal transition section B;

[0046] FIG4 is a front view of a bimetallic layer stamping structure W formed by punching and punching a bimetallic layer L;

[0047] FIG5 is a top view of a bimetallic layer stamped structure W formed by punching a hole in the bimetallic layer L;

[0048] FIG6 is a cross-sectional view taken along line AA of FIG5 ;

[0049] FIG7 is a front view of a dissimilar material structural assembly S for vacuum sealing formed by butting titanium metal A and a metal transition section B in a bimetallic layer stamped structural member W;

[0050] FIG8 is a top view of a dissimilar material structural assembly S for vacuum sealing formed by butting titanium metal A and a metal transition section B in a bimetallic layer stamped structural member W;

[0051] FIG9 is a BB sectional view of FIG8;

[0052] FIG10 is a front view of a dissimilar material structural assembly S for vacuum sealing formed by overlapping the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W;

[0053] FIG11 is a top view of a dissimilar material structural assembly S for vacuum sealing formed by overlapping the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W;

[0054] FIG12 is a CC sectional view of FIG11;

[0055] FIG13 is a front perspective view of a butt-jointed vacuum sealing dissimilar material structural assembly S;

[0056] FIG14 is a reverse perspective view of a butt-connected vacuum sealing dissimilar material structural assembly S;

[0057] FIG15 is a front perspective view of a lap-jointed vacuum sealing structural assembly S of dissimilar materials;

[0058] FIG. 16 is a reverse perspective view of a lap-jointed, vacuum-sealed dissimilar material structural assembly S. FIG.

[0059] Explanation of reference numerals: 1 - metal transition section B; 2 - cladding layer C; 3 - punched hole; 4 - titanium metal A; 5 - butt weld; 6 - lap weld. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0061] The present invention provides a method for connecting dissimilar materials of titanium metal and solder for sealing a vacuum container, the method comprising the following steps:

[0062] (1) Designing and preparing a metal transition section B based on the composition, physical and chemical properties of the titanium metal A to be connected, and requiring the metal transition section B to have good chemical compatibility with the titanium metal A;

[0063] (2) Design and prepare the cladding material R according to the composition, physical and chemical properties of the metal transition section B and the solder D. The cladding material R is required to have good plasticity, good chemical compatibility with the metal transition section B, and good wettability with the solder D.

[0064] (3) Selecting a suitable cladding heat source and determining the corresponding cladding method, setting the heat source process parameters, starting the heat source equipment, and using the cladding material R to partially clad the surface of the metal transition section B to prepare a cladding layer C, thereby forming a bimetallic layer L consisting of the cladding layer C and the metal transition section B;

[0065] (4) The surface of the cladding layer C is polished, and the bimetallic layer L is punched from one side of the cladding layer C using a stamping device. The bimetallic layer L is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W;

[0066] (5) Selecting a suitable connection heat source and determining a corresponding connection method, setting the heat source process parameters, starting the heat source equipment, and connecting the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W to prepare a dissimilar material structural component S for vacuum sealing;

[0067] (6) Using welding method to connect the vacuum sealing heterogeneous material structural component S with other parts of the container into a whole to form a container V;

[0068] (7) Solder D is placed on the small hole formed by stamping the bimetallic layer of the container V, and then the container V is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D and the container V are vacuum sealed to prepare a vacuum container.

[0069] Specifically, in step (1), a metal transition section B is designed and prepared based on the composition, physical and chemical properties of the titanium metal A to be connected. The metal transition section B is required to have good chemical compatibility with the titanium metal A so that the titanium metal A and the metal transition section B have excellent weldability and avoid the formation of brittle structure, which may lead to poor weld performance or even cracking.

[0070] In step (2), according to the composition, physical and chemical properties of the metal transition section B and the solder D, the cladding material R is designed and prepared. The cladding material R is required to have good plasticity, good chemical compatibility with the metal transition section B, and good wettability with the solder D. Since the physical properties of the metal transition section B and the solder D are very different, the chemical compatibility is poor, and the wettability is poor, direct brazing connection cannot be achieved. It is necessary to perform cladding on the metal transition section B to prepare a cladding layer C for indirect connection. First, the cladding material R used has good plasticity and low yield strength. The prepared cladding layer C has good plasticity and ductility, so that the cladding layer C can be deformed under low stress. At the same time, the plastic deformation temperature of the cladding layer C is close to the softening temperature of the solder D, so that it can be significantly improved during the brazing process. Reduce the stress during brazing of the cladding layer C and the solder D to avoid cracking; second, the cladding material R used has good chemical compatibility with the metal transition section B, so that the cladding layer C and the base layer of the metal transition section B can achieve good metallurgical bonding, and no brittle structures such as intermetallic compounds are generated; third, the cladding material R and the solder D are required to have good wettability, so that the solder D can spread well on the cladding layer C, and the cladding layer C and the solder D can achieve good brazing bonding; fourth, the cladding material R used has good plasticity, the prepared cladding layer C has good plasticity and ductility, and the plasticity and strength of the metal transition section B are also moderate, so that the prepared bimetallic layer has excellent comprehensive mechanical properties and excellent stamping performance. The bimetallic layer can meet the requirements of the next stamping process, and high-quality stamping parts can be obtained when punching.

[0071] In step (3), a suitable cladding heat source is selected and a corresponding cladding method is determined, the heat source process parameters are set, the heat source equipment is started, and the cladding material R is used to locally clad the surface of the metal transition section B to prepare a cladding layer C, forming a bimetallic layer L consisting of the cladding layer C and the metal transition section B. The metal transition section B is the base layer. Since the metal transition section B has good chemical compatibility with the cladding material R, that is, good metallurgical compatibility, it can avoid the formation of brittle structure, cracks or even cracks. Therefore, by using a melting electrode arc heat source, a non-melting electrode arc heat source, a plasma arc heat source, a laser heat source and a laser + arc composite heat source and corresponding cladding methods for cladding, and controlling the process parameters, a cladding layer with high bonding strength, good forming, small stress and deformation, and good internal quality can be prepared, thereby obtaining a high-quality bimetallic layer L.

[0072] In step (4), the surface of the cladding layer C is polished, and the bimetallic layer L is punched from one side of the cladding layer C using a stamping device. The bimetallic layer L is recessed and a small punching hole is formed in the center to prepare a bimetallic layer stamping structural part W. Since the bimetallic layer L has high comprehensive mechanical properties and good stamping performance, the shape and precision of the bimetallic layer stamping structural part W prepared after stamping can meet the sealing requirements of the next step of the cladding layer C and the solder D. The prepared stamping hole is also called a vacuum hole, which is used for vacuuming the container.

[0073] In step (5), a suitable connection heat source is selected and a corresponding connection method is determined, the heat source process parameters are set, the heat source equipment is started, and the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W are connected to prepare a heterogeneous material structural component S for vacuum sealing. Since the metal transition section B has good chemical compatibility with the titanium metal A, that is, good weldability, by adding or not adding welding wire, a heat source and a corresponding connection method are used to melt the titanium metal A and the metal transition section B to achieve butt or overlap connection of the titanium metal A and the metal transition section B. The weld formed after the molten pool solidifies can avoid the formation of brittle structure and cracks, so that the weld is well-formed and the internal quality is excellent, thereby obtaining a high-quality connection joint.

[0074] In step (6), the heterogeneous material structural component S is connected to the other parts of the container by welding to form a whole, thereby forming a container V, so as to prepare for the next step of vacuum sealing of the container.

[0075] In step (7), solder D is placed on the small hole formed after the bimetallic layer of the container V is stamped, and then the container V is placed in a vacuum furnace, the process parameters are set, the vacuum furnace is started, and the solder D and the container V are vacuum sealed to prepare a vacuum container. First, since the solder D has good wettability with the cladding layer C prepared by the cladding material R, the two materials have good brazing properties, so that the solder D can be well spread on the cladding layer after melting, and the bonding strength is high; second, since the cladding layer C has good plasticity and ductility, the plastic deformation temperature of the cladding layer C is close to the softening temperature of the solder D, so that during the brazing process, the cladding layer can be deformed under low stress, so that the stress generated by the difference in linear expansion coefficients of the cladding layer C and the solder D is released to a large extent, significantly reducing or even eliminating the residual stress, so that the bonding strength between the solder D and the cladding layer C is high and no cracking occurs.

[0076] Preferably, the titanium metal includes pure titanium and titanium alloys. A wide range of titanium metals are applicable, making it easy to select a suitable titanium metal according to actual needs.

[0077] Preferably, the solder D includes metal solder (metal brazing filler metal) and inorganic solder (inorganic brazing filler metal). The metal solder has good fluidity after melting and can wet the metal surface to achieve brazing connection. The inorganic solder includes oxides, fluorides, etc. After melting, the inorganic solder forms a glass phase that wets the metal surface to achieve brazing connection. It is suitable for a wide range of solders and can achieve brazing connection from low temperature to high temperature.

[0078] Preferably, the types of the cladding material R include welding wire and powder, which makes it easier to select the cladding material according to the characteristics of the cladding heat source and the corresponding cladding method, as well as the composition, physical and chemical properties and thickness of the metal transition section B.

[0079] Preferably, the metal transition section B has good plasticity, so that the prepared bimetallic layer has good stamping performance, thereby meeting the stamping process requirements.

[0080] Preferably, the connection form of the titanium metal A and the metal transition section B in the bimetallic layer stamping structure W is butt joint or overlap joint, which can adapt to different connection heat sources and corresponding connection methods, can be applied to different material thicknesses, and realize convenient and fast connection.

[0081] Preferably, the types of the cladding heat source include a consumable arc heat source, a non-consumable arc heat source, a plasma arc heat source, a laser heat source or a laser + arc composite heat source, which is used to melt the cladding material and the metal transition section B base layer to form a cladding layer C.

[0082] Preferably, the consumable electrode arc heat source, non-consumable electrode arc heat source, plasma arc heat source, laser heat source and laser + arc composite heat source are clad under the protection of inert gas to ensure the internal quality of the cladding layer and make the cladding layer have excellent formation. At the same time, the protective gas serves as a medium for generating arc and plasma arc, maintaining the stable combustion of arc and plasma arc, so that the cladding process is stable when the consumable electrode arc heat source, non-consumable electrode arc heat source, plasma arc heat source and laser + arc composite heat source are used.

[0083] Preferably, the cladding method corresponding to the consumable electrode arc heat source is consumable electrode arc welding, the cladding method corresponding to the non-consumable electrode arc heat source is wire-filled non-consumable electrode arc welding, the cladding method corresponding to the plasma arc heat source is plasma spray welding or plasma wire-filled welding, the cladding method corresponding to the laser heat source is laser wire-filled welding or powder-feeding laser cladding, and the cladding method corresponding to the laser + arc composite heat source is laser consumable electrode arc composite welding, which is convenient for cladding on metal transition sections of different thicknesses and different compositions, thereby improving cladding efficiency and forming quality.

[0084] Preferably, the types of the connection heat source include consumable arc heat source, non-consumable arc heat source, plasma arc heat source, electron beam heat source, laser heat source or laser + arc composite heat source, which are used to melt titanium metal, metal transition section and welding material for connection.

[0085] Preferably, the consumable electrode arc heat source, non-consumable electrode arc heat source, plasma arc heat source, laser heat source and laser + arc composite heat source are connected under the protection of inert gas to ensure the internal quality of the weld and make the weld formation excellent. At the same time, the protective gas serves as a medium for generating arc and plasma arc, maintaining the stable combustion of arc and plasma arc, so that the connection process is stable when using consumable electrode arc heat source, non-consumable electrode arc heat source, plasma arc heat source and laser + arc composite heat source.

[0086] Preferably, the electron beam heat source is welded under vacuum conditions to ensure a stable electron beam welding process, avoid metal oxidation, and ensure excellent weld internal quality and weld formation.

[0087] Preferably, the connection method corresponding to the consumable electrode arc heat source is consumable electrode arc welding, the connection method corresponding to the non-consumable electrode arc heat source is non-consumable electrode arc welding or non-consumable electrode arc welding with filler wire, the connection method corresponding to the plasma arc heat source is plasma arc welding or plasma welding with filler wire, the connection method corresponding to the electron beam heat source is vacuum electron beam welding, the connection method corresponding to the laser heat source is pure laser welding or laser welding with filler wire, and the connection method corresponding to the laser + arc composite heat source is laser consumable electrode arc composite welding, which facilitates the connection of titanium metals and metal transition sections of different thicknesses and different compositions, thereby improving the connection efficiency and forming quality.

[0088] Preferably, the welding material used in the consumable electrode arc welding, non-consumable electrode arc welding with filler wire, plasma welding with filler wire, laser welding with filler wire and laser consumable electrode arc hybrid welding is welding wire H. The welding wire H is required to have good chemical compatibility with the titanium metal A and the metal transition section B. The use of the welding wire can suppress defects, improve weld formation, prevent the weld from producing brittle structure, avoid weld cracking, and improve welding quality.

[0089] Preferably, the welding mode of the consumable electrode arc welding is CMT mode, pulse mode, DC mode or AC mode, which is convenient for selecting a suitable welding mode according to the composition, physical and chemical properties and plate thickness of the titanium metal A and the metal transition section B, as well as the composition, physical and chemical properties and wire diameter of the welding wire, so as to accurately control the heat input and temperature, reduce stress and deformation, avoid coarse grains in the heat-affected zone, avoid welding through due to excessive heat input, avoid incomplete welding due to insufficient heat input, and other problems, eliminate connection and cladding defects, ensure excellent formation of the weld and cladding layer, and ensure excellent internal quality and performance of the weld and cladding layer.

[0090] Preferably, the welding mode of the non-consumable electrode arc welding is a pulse mode, a DC mode or an AC mode, which is convenient for selecting a suitable welding mode according to the composition, physical and chemical properties and plate thickness of the titanium metal A and the metal transition section B, as well as the composition, physical and chemical properties and wire diameter of the welding wire, thereby accurately controlling the heat input and temperature, reducing stress and deformation, avoiding coarse grains in the heat-affected zone, avoiding welding through due to excessive heat input, avoiding incomplete welding due to insufficient heat input, eliminating connection and cladding defects, ensuring excellent formation of the weld and cladding layer, and ensuring excellent internal quality and performance of the weld and cladding layer.

[0091] Preferably, the vacuum sealing is performed under vacuum conditions, so as to facilitate brazing connection under a suitable vacuum degree, avoid metal oxidation, and improve brazing quality and bonding strength.

[0092] The method for connecting dissimilar materials of titanium metal and solder for sealing vacuum containers provided in the present application has the advantages of simple connection process, good welding flexibility, high connection efficiency, low connection cost, high connection quality, small stress and deformation, and can avoid coarse grains in the heat-affected zone, can avoid the formation of brittle structure, can eliminate various defects of cladding, melting connection and brazing connection, and the formed combined connection joint of titanium metal and solder has good internal quality, high bonding strength, good impact resistance, thermal insulation performance and sealing of the combined connection joint, and long container service life.

[0093] In order to better illustrate the method for connecting dissimilar materials of titanium metal and solder for vacuum container sealing provided by the present application, further examples are given below.

[0094] Example 1

[0095] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA1 pure titanium and solder D1. Solder D1 is an inorganic solder with the composition shown in Table 1. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA1 pure titanium and solder D1:

[0096] (1) Based on the composition, physical and chemical properties of the TA1 pure titanium to be connected, a metal transition section B1 is designed and prepared. The composition of the metal transition section B1 is shown in Table 2. The metal transition section B1 has good chemical compatibility with the TA1 pure titanium.

[0097] (2) Based on the composition, physical and chemical properties of the metal transition section B1 and the solder D1, the cladding material R1 is designed and prepared. The type of the cladding material R1 is welding wire, and its composition is shown in Table 3. The cladding material R1 has good plasticity, good chemical compatibility with the metal transition section B1, and good wettability with the solder D1.

[0098] (3) Selecting a consumable electrode arc heat source as the cladding heat source, determining the corresponding cladding method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the welding mode as the CMT mode, adopting inert gas protection, starting the consumable electrode arc heat source equipment, using the cladding material R1 to locally clad the surface of the metal transition section B1, preparing the cladding layer C1, and forming a bimetallic layer L1 consisting of the cladding layer C1 and the metal transition section B1;

[0099] (4) The surface of the cladding layer C1 is polished, and the bimetallic layer L1 is punched from one side of the cladding layer C1 using a stamping device. The bimetallic layer L1 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W1;

[0100] (5) Selecting a consumable electrode arc heat source as the connection heat source, determining the corresponding connection method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the CMT mode as the welding mode, adopting inert gas protection, and the composition of the welding wire H1 used is shown in Table 2. The chemical compatibility of the welding wire H1 with the TA1 pure titanium and the metal transition section B1 is good. The connection form used is overlap. Start the consumable electrode arc heat source equipment, and connect the TA1 pure titanium and the metal transition section B1 in the bimetallic layer stamping structure W1 to prepare the dissimilar material structure component S1 for vacuum sealing;

[0101] (6) Using welding, the vacuum sealing heterogeneous material structural component S1 is connected to the other parts of the container to form a whole, thereby forming a container V1;

[0102] (7) Solder D1 is placed on the small hole formed after the bimetallic layer of container V1 is stamped, and then container V1 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D1 and container V1 are vacuum-sealed to prepare a vacuum container.

[0103] Table 1 Composition and content of solder D1

[0104] Table 2 Composition and content of metal transition section B1 and welding wire H1

[0105] Table 3 Composition and content of cladding material R1

[0106] Example 2

[0107] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA2 pure titanium and solder D2. Solder D2 is an inorganic solder, and its composition is shown in Table 4. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. To implement the dissimilar material joining between TA2 pure titanium and solder D2, the method specifically includes the following steps:

[0108] (1) Based on the composition, physical and chemical properties of the TA2 pure titanium to be connected, a metal transition section B2 was designed and prepared. The composition of the metal transition section B2 is shown in Table 5. The metal transition section B2 has good chemical compatibility with the TA2 pure titanium.

[0109] (2) Based on the composition, physical and chemical properties of the metal transition section B2 and the solder D2, the cladding material R2 is designed and prepared. The type of the cladding material R2 is welding wire, and its composition is shown in Table 6. The cladding material R2 has good plasticity, good chemical compatibility with the metal transition section B2, and good wettability with the solder D2.

[0110] (3) Selecting a consumable electrode arc heat source as a cladding heat source, determining the corresponding cladding method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the AC welding mode, adopting inert gas protection, starting the consumable electrode arc heat source equipment, using the cladding material R2 to partially clad the surface of the metal transition section B2, preparing the cladding layer C2, and forming a bimetallic layer L2 consisting of the cladding layer C2 and the metal transition section B2;

[0111] (4) The surface of the cladding layer C2 is polished, and the bimetallic layer L2 is punched from one side of the cladding layer C2 using a stamping device. The bimetallic layer L2 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W2;

[0112] (5) Selecting a consumable electrode arc heat source as the connection heat source, determining the corresponding connection method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the pulse mode of welding mode, adopting inert gas protection, and the composition of the welding wire H2 used is shown in Table 5. The chemical compatibility of the welding wire H2 with the TA2 pure titanium and the metal transition section B2 is good. The connection form used is butt connection. Start the consumable electrode arc heat source equipment, and connect the TA2 pure titanium and the metal transition section B2 in the bimetallic layer stamping structure W2 to prepare the dissimilar material structure component S2 for vacuum sealing;

[0113] (6) Using welding, the vacuum sealing heterogeneous material structural component S2 is connected to the other parts of the container to form a whole, thereby forming the container V2;

[0114] (7) Solder D2 is placed on the small hole formed after the bimetallic layer of container V2 is stamped, and then container V2 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D2 and container V2 are vacuum-sealed to prepare a vacuum container.

[0115] Table 4 Composition and content of solder D2

[0116] Table 5 Composition and content of metal transition section B2 and welding wire H2

[0117] Table 6 Composition and content of cladding material R2

[0118] Example 3

[0119] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA3 pure titanium and solder D3. Solder D3 is an inorganic solder with the composition shown in Table 7. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA3 pure titanium and solder D3:

[0120] (1) Based on the composition, physical and chemical properties of the TA3 pure titanium to be connected, a metal transition section B3 was designed and prepared. The composition of the metal transition section B3 is shown in Table 8. The metal transition section B3 has good chemical compatibility with the TA3 pure titanium.

[0121] (2) Based on the composition, physical and chemical properties of the metal transition section B3 and the solder D3, the cladding material R3 is designed and prepared. The type of the cladding material R3 is welding wire, and its composition is shown in Table 9. The cladding material R3 has good plasticity, good chemical compatibility with the metal transition section B3, and good wettability with the solder D3.

[0122] (3) Selecting a non-consumable electrode arc heat source as the cladding heat source, determining the corresponding cladding method as filler wire non-consumable electrode arc welding, setting the non-consumable electrode arc heat source process parameters, using inert gas protection, starting the non-consumable electrode arc heat source equipment, and using the cladding material R3 to partially clad the surface of the metal transition section B3 to prepare a cladding layer C3, forming a bimetallic layer L3 consisting of the cladding layer C3 and the metal transition section B3;

[0123] (4) The surface of the cladding layer C3 is polished, and the bimetallic layer L3 is punched from one side of the cladding layer C3 using a stamping device. The bimetallic layer L3 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W3;

[0124] (5) Selecting a laser heat source as the connection heat source, determining the corresponding connection method as pure laser welding, setting the laser heat source process parameters, using inert gas protection, and adopting the connection form of docking, starting the laser heat source equipment, and connecting the TA3 pure titanium and the metal transition section B3 in the bimetallic layer stamping structure W3 to prepare a dissimilar material structure component S3 for vacuum sealing;

[0125] (6) Using welding, the vacuum sealing heterogeneous material structural component S3 is connected to the other parts of the container to form a whole, thereby forming a container V3;

[0126] (7) Solder D3 is placed on the small hole formed after the bimetallic layer of container V3 is stamped, and then container V3 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D3 and container V3 are vacuum-sealed to prepare a vacuum container.

[0127] Table 7 Composition and content of solder D3

[0128] Table 8 Composition and content of metal transition section B3

[0129] Table 9 Composition and content of cladding material R3

[0130] Example 4

[0131] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA1G pure titanium and solder D4. Solder D4 is an inorganic solder with the composition shown in Table 10. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA1G pure titanium and solder D4:

[0132] (1) Based on the composition, physical and chemical properties of the TA1G pure titanium to be connected, a metal transition section B4 was designed and prepared. The composition of the metal transition section B4 is shown in Table 11. The metal transition section B4 has good chemical compatibility with the TA1G pure titanium.

[0133] (2) Based on the composition, physical and chemical properties of the metal transition section B4 and the solder D4, the cladding material R4 is designed and prepared. The cladding material R4 is a powder with the composition shown in Table 12. The cladding material R4 has good plasticity, good chemical compatibility with the metal transition section B4, and good wettability with the solder D4.

[0134] (3) Selecting a plasma arc heat source as the cladding heat source, determining the corresponding cladding method as plasma spray welding, setting the plasma arc heat source process parameters, using inert gas protection, starting the plasma arc heat source equipment, and using the cladding material R4 to locally clad the surface of the metal transition section B4 to prepare a cladding layer C4, forming a bimetallic layer L4 consisting of the cladding layer C4 and the metal transition section B4;

[0135] (4) The surface of the cladding layer C4 is polished, and the bimetallic layer L4 is punched from one side of the cladding layer C4 using a stamping device. The bimetallic layer L4 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W4;

[0136] (5) Selecting a non-melting electrode arc heat source as the connection heat source, determining the corresponding connection method as filler wire non-melting electrode arc welding, setting the process parameters of the non-melting electrode arc heat source, adopting inert gas protection, and the composition of the welding wire H4 used is shown in Table 11. The chemical compatibility of the welding wire H4 with TA1G pure titanium and the metal transition section B4 is good. The connection form used is overlap. Start the non-melting electrode arc heat source equipment, and connect the TA1G pure titanium and the metal transition section B4 in the bimetallic layer stamping structure W4 to prepare the dissimilar material structure component S4 for vacuum sealing;

[0137] (6) Using welding, the vacuum sealing heterogeneous material structural component S4 is connected to the other parts of the container to form a whole, thereby forming a container V4;

[0138] (7) Solder D4 is placed on the small hole formed after the bimetallic layer of container V4 is stamped, and then container V4 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D4 and container V4 are vacuum sealed to prepare a vacuum container.

[0139] Table 10 Composition and content of solder D4

[0140] Table 11 Composition and content of metal transition section B4 and welding wire H4

[0141] Table 12 Composition and content of cladding material R4

[0142] Example 5

[0143] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA2G pure titanium and solder D5. Solder D5 is an inorganic solder with the composition shown in Table 13. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA2G pure titanium and solder D5:

[0144] (1) Based on the composition, physical and chemical properties of the TA2G pure titanium to be connected, a metal transition section B5 was designed and prepared. The composition of the metal transition section B5 is shown in Table 14. The metal transition section B5 has good chemical compatibility with the TA2G pure titanium.

[0145] (2) Based on the composition, physical and chemical properties of the metal transition section B5 and the solder D5, the cladding material R5 is designed and prepared. The type of cladding material R5 is welding wire, and its composition is shown in Table 15. The cladding material R5 has good plasticity, good chemical compatibility with the metal transition section B5, and good wettability with the solder D5.

[0146] (3) Selecting a plasma arc heat source as a cladding heat source, determining the corresponding cladding method as plasma wire welding, setting the plasma arc heat source process parameters, using inert gas protection, starting the plasma arc heat source equipment, and using the cladding material R5 to partially clad the surface of the metal transition section B5 to prepare a cladding layer C5, thereby forming a bimetallic layer L5 consisting of the cladding layer C5 and the metal transition section B5;

[0147] (4) The surface of the cladding layer C5 is polished, and the bimetallic layer L5 is punched from one side of the cladding layer C5 using a stamping device. The bimetallic layer L5 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W5;

[0148] (5) Selecting a laser heat source as the connection heat source, determining the corresponding connection method as laser wire welding, setting the laser heat source process parameters, adopting inert gas protection, and using the welding wire H5 composition as shown in Table 14. The welding wire H5 has good chemical compatibility with both TA2G pure titanium and the metal transition section B5. The connection form used is overlap. Start the laser heat source equipment, and connect the TA2G pure titanium and the metal transition section B5 in the bimetallic layer stamping structure W5 to prepare the dissimilar material structure component S5 for vacuum sealing;

[0149] (6) Using welding, the vacuum sealing heterogeneous material structural component S5 is connected to the other parts of the container to form a whole, thereby forming a container V5;

[0150] (7) Solder D5 is placed on the small hole formed after the bimetallic layer of container V5 is stamped, and then container V5 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D5 and container V5 are vacuum sealed to prepare a vacuum container.

[0151] Table 13 Composition and content of solder D5

[0152] Table 14 Composition and content of metal transition section B5 and welding wire H5

[0153] Table 15 Composition and content of cladding material R5

[0154] Example 6

[0155] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA3G pure titanium and solder D6. Solder D6 is an inorganic solder with the composition shown in Table 16. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA3G pure titanium and solder D6:

[0156] (1) Based on the composition, physical and chemical properties of the TA3G pure titanium to be connected, a metal transition section B6 was designed and prepared. The composition of the metal transition section B6 is shown in Table 17. The metal transition section B6 has good chemical compatibility with the TA3G pure titanium.

[0157] (2) Based on the composition, physical and chemical properties of the metal transition section B6 and the solder D6, the cladding material R6 is designed and prepared. The type of the cladding material R6 is welding wire, and its composition is shown in Table 18. The cladding material R6 has good plasticity, good chemical compatibility with the metal transition section B6, and good wettability with the solder D6.

[0158] (3) Selecting a consumable electrode arc heat source as the cladding heat source, determining the corresponding cladding method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the DC welding mode, adopting inert gas protection, starting the consumable electrode arc heat source equipment, and using the cladding material R6 to partially clad the surface of the metal transition section B6 to prepare a cladding layer C6, forming a bimetallic layer L6 consisting of the cladding layer C6 and the metal transition section B6;

[0159] (4) The surface of the cladding layer C6 is polished, and the bimetallic layer L6 is punched from one side of the cladding layer C6 using a stamping device. The bimetallic layer L6 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W6;

[0160] (5) Selecting an electron beam heat source as the connection heat source, determining the corresponding connection method as electron beam welding, setting the electron beam heat source process parameters, connecting under vacuum conditions, adopting the connection form of docking, starting the electron beam heat source equipment, and connecting the TA3G pure titanium and the metal transition section B6 in the bimetallic layer stamping structure W6 to prepare a dissimilar material structure component S6 for vacuum sealing;

[0161] (6) Using welding, the vacuum sealing heterogeneous material structural component S6 is connected to the other parts of the container to form a whole, thereby forming a container V6;

[0162] (7) Solder D6 is placed on the small hole formed after the bimetallic layer of container V6 is stamped, and then container V6 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D6 and container V6 are vacuum sealed to prepare a vacuum container.

[0163] Table 16 Composition and content of solder D6

[0164] Table 17 Composition and content of metal transition section B6

[0165] Table 18 Composition and content of cladding material R6

[0166] Example 7

[0167] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA4G pure titanium and solder D7. Solder D7 is an inorganic solder with the composition shown in Table 19. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA4G pure titanium and solder D7:

[0168] (1) Based on the composition, physical and chemical properties of the TA4G pure titanium to be connected, a metal transition section B7 was designed and prepared. The composition of the metal transition section B7 is shown in Table 20. The metal transition section B7 has good chemical compatibility with the TA4G pure titanium.

[0169] (2) Based on the composition, physical and chemical properties of the metal transition section B7 and the solder D7, the cladding material R7 is designed and prepared. The type of cladding material R7 is welding wire, and its composition is shown in Table 21. The cladding material R7 has good plasticity, good chemical compatibility with the metal transition section B7, and good wettability with the solder D7.

[0170] (3) Selecting a consumable electrode arc heat source as the cladding heat source, determining the corresponding cladding method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the pulse mode as the welding mode, adopting inert gas protection, starting the consumable electrode arc heat source equipment, and using the cladding material R7 to partially clad the surface of the metal transition section B7 to prepare the cladding layer C7, forming a bimetallic layer L7 consisting of the cladding layer C7 and the metal transition section B7;

[0171] (4) The surface of the cladding layer C7 is polished, and the bimetallic layer L7 is punched from one side of the cladding layer C7 using a stamping device. The bimetallic layer L7 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W7;

[0172] (5) Selecting a plasma arc heat source as the connection heat source, determining the corresponding connection method as plasma arc welding, setting the plasma arc heat source process parameters, adopting inert gas protection, adopting the connection form as docking, starting the plasma arc heat source equipment, and connecting the TA4G pure titanium and the metal transition section B7 in the bimetallic layer stamping structure W7 to prepare a dissimilar material structural component S7 for vacuum sealing;

[0173] (6) Using welding, the vacuum sealing heterogeneous material structural component S7 is connected to the other parts of the container to form a whole, thereby forming a container V7;

[0174] (7) Solder D7 is placed on the small hole formed after the bimetallic layer of container V7 is stamped, and then container V7 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D7 and container V7 are vacuum-sealed to prepare a vacuum container.

[0175] Table 19 Composition and content of solder D7

[0176] Table 20 Composition and content of metal transition section B7

[0177] Table 21 Composition and content of cladding material R7

[0178] Example 8

[0179] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA10 titanium alloy and solder D8. Solder D8 is an inorganic solder with the composition shown in Table 22. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TA10 titanium alloy and solder D8:

[0180] (1) Based on the composition, physical and chemical properties of the TA10 titanium alloy to be connected, a metal transition section B8 was designed and prepared. The composition of the metal transition section B8 is shown in Table 23. The metal transition section B8 has good chemical compatibility with the TA10 titanium alloy.

[0181] (2) Based on the composition, physical and chemical properties of the metal transition section B8 and the solder D8, the cladding material R8 is designed and prepared. The type of cladding material R8 is welding wire, and its composition is shown in Table 24. The cladding material R8 has good plasticity, good chemical compatibility with the metal transition section B8, and good wettability with the solder D8.

[0182] (3) Selecting a consumable electrode arc heat source as the cladding heat source, determining the corresponding cladding method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the CMT welding mode, adopting inert gas protection, starting the consumable electrode arc heat source equipment, using the cladding material R8 to partially clad the surface of the metal transition section B8, preparing the cladding layer C8, and forming a bimetallic layer L8 consisting of the cladding layer C8 and the metal transition section B8;

[0183] (4) The surface of the cladding layer C8 is polished, and the bimetallic layer L8 is punched from one side of the cladding layer C8 using a stamping device. The bimetallic layer L8 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W8;

[0184] (5) Selecting a non-melting electrode heat source as the connection heat source, determining the corresponding connection method as non-melting electrode arc welding, setting the process parameters of the non-melting electrode arc heat source, adopting inert gas protection, adopting the connection form as docking, starting the non-melting electrode arc heat source equipment, and connecting the TA10 titanium alloy and the metal transition section B8 in the bimetallic layer stamping structure W8 to prepare a dissimilar material structural component S8 for vacuum sealing;

[0185] (6) Using welding, the vacuum sealing heterogeneous material structural component S8 is connected to the other parts of the container to form a whole, thereby forming a container V8;

[0186] (7) Solder D8 is placed on the small hole formed after the bimetallic layer of container V8 is stamped, and then container V8 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D8 and container V8 are vacuum sealed to prepare a vacuum container.

[0187] Table 22 Composition and content of solder D8

[0188] Table 23 Composition and content of metal transition section B8

[0189] Table 24 Composition and content of cladding material R8

[0190] Example 9

[0191] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA15 titanium alloy and solder D9. Solder D9 is an inorganic solder with the composition shown in Table 25. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps:

[0192] (1) Based on the composition, physical and chemical properties of the TA15 titanium alloy to be connected, a metal transition section B9 was designed and prepared. The composition of the metal transition section B9 is shown in Table 26. The metal transition section B9 has good chemical compatibility with the TA15 titanium alloy.

[0193] (2) Based on the composition, physical and chemical properties of the metal transition section B9 and the solder D9, the cladding material R9 is designed and prepared. The cladding material R9 is a powder with the composition shown in Table 27. The cladding material R9 has good plasticity, good chemical compatibility with the metal transition section B9, and good wettability with the solder D9.

[0194] (3) Selecting a laser heat source as the cladding heat source, determining the corresponding cladding method as powder feeding laser cladding, setting the laser heat source process parameters, using inert gas protection, starting the laser heat source equipment, and using the cladding material R9 to partially clad the surface of the metal transition section B9 to prepare a cladding layer C9, forming a bimetallic layer L9 consisting of the cladding layer C9 and the metal transition section B9;

[0195] (4) The surface of the cladding layer C9 is polished, and the bimetallic layer L9 is punched from one side of the cladding layer C9 using a stamping device. The bimetallic layer L9 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W9;

[0196] (5) Selecting a consumable electrode arc heat source as the connection heat source, determining the corresponding connection method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the DC welding mode, adopting inert gas protection, and the composition of the welding wire H9 used is shown in Table 26. The chemical compatibility of the welding wire H9 with the TA15 titanium alloy and the metal transition section B9 is good. The connection form used is overlap. Start the consumable electrode arc heat source equipment, and connect the TA15 titanium alloy and the metal transition section B9 in the bimetallic layer stamping structure W9 to prepare the dissimilar material structure component S9 for vacuum sealing;

[0197] (6) Using welding, the vacuum sealing heterogeneous material structural component S9 is connected to the other parts of the container to form a whole, thereby forming a container V9;

[0198] (7) Solder D9 is placed on the small hole formed after the bimetallic layer of the container V9 is stamped, and then the container V9 is placed in a vacuum furnace, the process parameters are set, the vacuum furnace is started, and the solder D9 and the container V9 are vacuum sealed to prepare a vacuum container.

[0199] Table 25 Composition and content of solder D9

[0200] Table 26 Composition and content of metal transition section B9 and welding wire H9

[0201] Table 27 Composition and content of cladding material R9

[0202] Example 10

[0203] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TA18 titanium alloy and solder D10. Solder D10 is an inorganic solder with the composition shown in Table 28. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps:

[0204] (1) Based on the composition, physical and chemical properties of the TA18 titanium alloy to be connected, a metal transition section B10 was designed and prepared. The composition of the metal transition section B10 is shown in Table 29. The metal transition section B10 has good chemical compatibility with the TA18 titanium alloy.

[0205] (2) Based on the composition, physical and chemical properties of the metal transition section B10 and the solder D10, the cladding material R10 is designed and prepared. The type of cladding material R10 is welding wire, and its composition is shown in Table 30. The cladding material R10 has good plasticity, good chemical compatibility with the metal transition section B10, and good wettability with the solder D10.

[0206] (3) Selecting a laser + arc composite heat source as the cladding heat source, determining the corresponding cladding method as laser metal arc composite welding, setting the laser + arc composite heat source process parameters, using inert gas protection, starting the laser + arc composite heat source equipment, using the cladding material R10 to locally clad the surface of the metal transition section B10, preparing the cladding layer C10, and forming a bimetallic layer L10 consisting of the cladding layer C10 and the metal transition section B10;

[0207] (4) The surface of the cladding layer C10 is polished, and the bimetallic layer L10 is punched from one side of the cladding layer C10 using a stamping device. The bimetallic layer L10 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W10;

[0208] (5) Selecting a plasma arc heat source as the connection heat source, determining the corresponding connection method as plasma filler wire welding, setting the plasma arc heat source process parameters, adopting inert gas protection, and the composition of the welding wire H10 used is shown in Table 29. The chemical compatibility of the welding wire H10 with the TA18 titanium alloy and the metal transition section B10 is good. The connection form used is overlap. Start the plasma arc heat source equipment, and connect the TA18 titanium alloy and the metal transition section B10 in the bimetallic layer stamping structure W10 to prepare a dissimilar material structural component S10 for vacuum sealing;

[0209] (6) Using welding, the vacuum sealing heterogeneous material structural component S10 is connected to the other parts of the container to form a whole, thereby forming a container V10;

[0210] (7) Solder D10 is placed on the small hole formed after the bimetallic layer of the container V10 is stamped, and then the container V10 is placed in a vacuum furnace, the process parameters are set, the vacuum furnace is started, and the solder D10 and the container V10 are vacuum-sealed to prepare a vacuum container.

[0211] Table 28 Composition and content of solder D10

[0212] Table 29 Composition and content of metal transition section B10 and welding wire H10

[0213] Table 30 Composition and content of cladding material R10

[0214] Example 11

[0215] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TC4 titanium alloy and solder D11. Solder D11 is a metal solder with the composition shown in Table 31. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TC4 titanium alloy and solder D11:

[0216] (1) Based on the composition, physical and chemical properties of the TC4 titanium alloy to be connected, a metal transition section B11 was designed and prepared. The composition of the metal transition section B11 is shown in Table 32. The metal transition section B11 has good chemical compatibility with the TC4 titanium alloy.

[0217] (2) Based on the composition, physical and chemical properties of the metal transition section B11 and the solder D11, the cladding material R11 is designed and prepared. The type of cladding material R11 is welding wire, and its composition is shown in Table 33. The cladding material R11 has good plasticity, good chemical compatibility with the metal transition section B11, and good wettability with the solder D11.

[0218] (3) Selecting a laser heat source as the cladding heat source, determining the corresponding cladding method as laser wire welding, setting the laser heat source process parameters, using inert gas protection, starting the laser heat source equipment, and using the cladding material R11 to locally clad the surface of the metal transition section B11 to prepare a cladding layer C11, forming a bimetallic layer L11 consisting of the cladding layer C11 and the metal transition section B11;

[0219] (4) The surface of the cladding layer C11 is polished, and the bimetallic layer L11 is punched from one side of the cladding layer C11 using a stamping device. The bimetallic layer L11 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W11;

[0220] (5) Selecting a consumable electrode arc heat source as the connection heat source, determining the corresponding connection method as consumable electrode arc welding, setting the consumable electrode arc heat source process parameters, adopting the AC welding mode, adopting inert gas protection, and the composition of the welding wire H11 used is shown in Table 32. The chemical compatibility of the welding wire H11 with the TC4 titanium alloy and the metal transition section B11 is good. The connection form used is butt connection. Start the consumable electrode arc heat source equipment, and connect the TC4 titanium alloy and the metal transition section B11 in the bimetallic layer stamping structure W11 to prepare the dissimilar material structure component S11 for vacuum sealing;

[0221] (6) Using welding, the vacuum sealing heterogeneous material structural component S11 is connected to the other parts of the container to form a whole, thereby forming a container V11;

[0222] (7) Solder D11 is placed on the small hole formed after the bimetallic layer of the container V11 is stamped, and then the container V11 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D11 and the container V11 are vacuum-sealed to prepare a vacuum container.

[0223] Table 31 Composition and content of solder D11

[0224] Table 32 Composition and content of metal transition section B11 and welding wire H11

[0225] Table 33 Composition and content of cladding material R11

[0226] Example 12

[0227] A method for joining dissimilar materials between titanium metal and solder for vacuum container sealing is disclosed. The joining materials are TB2 titanium alloy and solder D12. Solder D12 is a metal solder with the composition shown in Table 34. The two materials have poor chemical compatibility, significant differences in thermophysical properties, and poor wettability. The method specifically includes the following steps to join dissimilar materials between TB2 titanium alloy and solder D12:

[0228] (1) Based on the composition, physical and chemical properties of the TB2 titanium alloy to be connected, a metal transition section B12 was designed and prepared. The composition of the metal transition section B12 is shown in Table 35. The metal transition section B12 has good chemical compatibility with the TB2 titanium alloy.

[0229] (2) Based on the composition, physical and chemical properties of the metal transition section B12 and the solder D12, the cladding material R12 is designed and prepared. The cladding material R12 is a powder, and its composition is shown in Table 36. The cladding material R12 has good plasticity, good chemical compatibility with the metal transition section B12, and good wettability with the solder D12.

[0230] (3) Selecting a laser heat source as the cladding heat source, determining the corresponding cladding method as powder feeding laser cladding, setting the laser heat source process parameters, using inert gas protection, starting the laser heat source equipment, and using the cladding material R12 to partially clad the surface of the metal transition section B12 to prepare a cladding layer C12, thereby forming a bimetallic layer L12 consisting of the cladding layer C12 and the metal transition section B12;

[0231] (4) The surface of the cladding layer C12 is polished, and the bimetallic layer L12 is punched from one side of the cladding layer C12 using a stamping device. The bimetallic layer L12 is concave and a small punching hole is formed in the center to prepare a bimetallic layer stamping structure W12;

[0232] (5) Selecting the laser + arc composite heat source as the connection heat source, determining the corresponding connection method as laser melting electrode arc hybrid welding, setting the laser + arc composite heat source process parameters, adopting inert gas protection, and the composition of the welding wire H12 used is shown in Table 35. The chemical compatibility of the welding wire H12 with the TB2 titanium alloy and the metal transition section B12 is good. The connection form used is overlap. Start the laser + arc composite heat source equipment, and connect the TB2 titanium alloy and the metal transition section B12 in the bimetallic layer stamping structure W12 to prepare the dissimilar material structure component S12 for vacuum sealing;

[0233] (6) Using welding, the vacuum sealing heterogeneous material structural component S12 is connected to the other parts of the container to form a whole, thereby forming a container V12;

[0234] (7) Solder D12 is placed on the small hole formed after the bimetallic layer of container V12 is stamped, and then container V12 is placed in a vacuum furnace. The process parameters are set, the vacuum furnace is started, and the solder D12 and container V12 are vacuum-sealed to prepare a vacuum container.

[0235] Table 34 Composition and content of solder D12

[0236] Table 35 Composition and content of metal transition section B12 and welding wire H12

[0237] Table 36 Composition and content of cladding material R12

[0238] The above embodiments organically combine additive manufacturing technology (surface modification technology), dissimilar metal connection technology, and dissimilar material brazing technology. According to the composition, physical and chemical properties of titanium metal and solder, a suitable metal transition section is designed and adopted, and then a suitable cladding material is designed and adopted, and a suitable cladding heat source and a corresponding cladding method are used to perform high-quality cladding on the surface of the metal transition section. By adopting a suitable connection heat source and a corresponding connection method, and adopting a suitable welding wire or no welding wire, a high-quality connection is achieved between the titanium metal and the metal transition section. Finally, a high-quality brazing seal is performed between the cladding layer and the solder, thereby achieving a high-quality indirect connection between the titanium metal and the solder, solving the problem of large differences in physical properties and chemical compatibility between the titanium metal and the solder used for vacuum container sealing. The problems such as poor heat dissipation, poor wettability, etc., which lead to large stress and deformation, easy formation of brittle structure, poor internal quality of connection joints, low bonding strength, poor impact resistance, poor thermal insulation performance and sealing, and short service life of containers, are solved by this method of connecting dissimilar materials. The connection cost is low, the connection process is simple, the connection efficiency is high, the welding flexibility is good, the stress and deformation are small, the coarse grains in the heat affected zone are avoided, the cladding interface and the fusion welding joint form brittle structure, and various connection defects are eliminated. The internal quality of the cladding layer and the fusion welding weld is excellent, the bonding strength of the cladding interface and the fusion welding joint is high, the bonding strength of the brazing sealing joint is high and the sealing performance is good. The internal quality of the combined connection joint of titanium metal and solder is good, the bonding strength is high, the impact resistance, thermal insulation performance and sealing of the combined connection joint are good, and the service life of the container is long.

[0239] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for joining dissimilar materials of titanium metal and solder for sealing a vacuum container, characterized in that, It includes the following steps: (1) According to the composition, physical and chemical properties of the titanium metal A to be connected, design and prepare a metal transition section B, and require that the chemical compatibility between the metal transition section B and the titanium metal A is good; (2) According to the composition, physical and chemical properties of the metal transition section B and the solder D, design and prepare a cladding material R, and require that the cladding material R has good plasticity, the chemical compatibility between the cladding material R and the metal transition section B is good, and the wettability between the cladding material R and the solder D is good; (3) Select a suitable cladding heat source and determine the corresponding cladding method, set the heat source process parameters, start the heat source equipment, and use the cladding material R to locally clad the surface of the metal transition section B to prepare a clad layer C, and form a bimetallic layer L composed of the clad layer C and the metal transition section B; (4) Grind the surface of the clad layer C, and use a stamping device to stamp the bimetallic layer L from one side of the clad layer C, the bimetallic layer L forms a depression, and a stamping small hole is formed in the center to prepare a bimetallic layer stamping structural part W; (5) Select a suitable connection heat source and determine the corresponding connection method, set the heat source process parameters, start the heat source equipment, and connect the titanium metal A and the metal transition section B in the bimetallic layer stamping structural part W to prepare a dissimilar material structural component S for vacuum sealing; (6) Use a welding method to connect the dissimilar material structural component S for vacuum sealing with other parts of the container to form an integral container V; (7) Place the solder D at the stamping small hole formed after stamping the bimetallic layer of the container V, then place the container V in a vacuum furnace, set the process parameters, start the vacuum furnace, and perform vacuum sealing on the solder D and the container V to prepare a vacuum container.

2. The method for joining dissimilar materials according to claim 1, wherein, The titanium metal A includes pure titanium or a titanium alloy, the solder D includes a metal solder or an inorganic solder, and the type of the cladding material R includes a welding wire or powder.

3. The method for joining dissimilar materials according to claim 2, wherein The pure titanium includes TA1 pure titanium, TA2 pure titanium, TA3 pure titanium, TA1G pure titanium, TA2G pure titanium, TA3G pure titanium or TA4G pure titanium.

4. The method for joining dissimilar materials according to claim 2, characterized in that, The titanium alloy includes TA10 titanium alloy, TA15 titanium alloy, TA18 titanium alloy, TC4 titanium alloy or TB2 titanium alloy.

5. The method for joining dissimilar materials according to claim 2, characterized in that, The inorganic solder includes an oxide or a fluoride.

6. The method for joining dissimilar materials according to claim 1, wherein The connection form between the titanium metal A and the metal transition section B in the bimetallic layer stamping structural part W is butt joint or lap joint.

7. The method for joining dissimilar materials according to claim 1, characterized in that, The type of the cladding heat source includes a consumable electrode arc heat source, a non-consumable electrode arc heat source, a plasma arc heat source, a laser heat source or a laser + arc composite heat source.

8. The method for joining dissimilar materials according to claim 7, wherein The consumable electrode arc heat source, the non-consumable electrode arc heat source, the plasma arc heat source, the laser heat source and the laser + arc composite heat source are clad under the protection of an inert gas.

9. The method for joining dissimilar materials according to claim 7 or 8, characterized in that, The cladding method corresponding to the consumable electrode arc heat source is consumable electrode arc welding, the cladding method corresponding to the non-consumable electrode arc heat source is filler wire non-consumable electrode arc welding, the cladding method corresponding to the plasma arc heat source is plasma spray welding or plasma filler wire welding, the cladding method corresponding to the laser heat source is laser filler wire welding or powder-fed laser cladding, and the cladding method corresponding to the laser + arc hybrid heat source is laser consumable electrode arc hybrid welding.

10. The method for joining dissimilar materials according to claim 1, characterized in that, The types of the connecting heat sources include a consumable electrode arc heat source, a non-consumable electrode arc heat source, a plasma arc heat source, an electron beam heat source, a laser heat source, or a laser + arc hybrid heat source.

11. The method for joining dissimilar materials according to claim 10, characterized in that, The consumable electrode arc heat source, the non-consumable electrode arc heat source, the plasma arc heat source, the laser heat source, and the laser + arc hybrid heat source are connected under the protection of an inert gas, and the electron beam heat source is connected under vacuum conditions.

12. The method for joining dissimilar materials according to claim 10 or 11, characterized in that, The connecting method corresponding to the consumable electrode arc heat source is consumable electrode arc welding, the connecting method corresponding to the non-consumable electrode arc heat source is non-consumable electrode arc welding or filler wire non-consumable electrode arc welding, the connecting method corresponding to the plasma arc heat source is plasma arc welding or plasma filler wire welding, the connecting method corresponding to the electron beam heat source is vacuum electron beam welding, the connecting method corresponding to the laser heat source is pure laser welding or laser filler wire welding, and the connecting method corresponding to the laser + arc hybrid heat source is laser consumable electrode arc hybrid welding.

13. The method for joining dissimilar materials according to claim 12, characterized in that, The welding materials used in the consumable electrode arc welding, filler wire non-consumable electrode arc welding, plasma filler wire welding, laser filler wire welding, and laser consumable electrode arc hybrid welding are welding wire H, and it is required that the welding wire H has good chemical compatibility with the titanium metal A and the metal transition section B.

14. The method for joining dissimilar materials according to claim 9 or 11, characterized in that, The welding mode of the consumable electrode arc welding is CMT mode, pulse mode, DC mode, or AC mode.

15. The method for joining dissimilar materials according to claim 12, characterized in that, The welding mode of the non-consumable electrode arc welding is pulse mode, DC mode, or AC mode.

16. A dissimilar material structural component for vacuum sealing, characterized in that, It is formed by connecting the bimetallic layer stamping structure part W and the titanium metal A; The bimetallic stamping structure part W is obtained by stamping the bimetallic layer L. The stamping is performed from the side of the cladding layer C of the bimetallic layer L. The bimetallic layer L forms a depression and a stamping small hole is formed in the center; The bimetallic layer L is composed of a cladding layer C and a metal transition section B. The cladding layer C is prepared by locally cladding the surface of the metal transition section B with a cladding material R; The material of the metal transition section (1) has good chemical compatibility with the material of the titanium metal (4); The material of the cladding layer (2) has good plasticity and good chemical compatibility with the material of the metal transition section (1).

17. The dissimilar material structure component according to claim 16, wherein The connection methods are butt joint and lap joint; When the connection method is butt joint, it also includes a butt weld (5); When the connection method is lap joint, it also includes a lap weld (6).

18. A method for preparing the dissimilar material structural component according to claim 16 or 17, characterized in that, It includes the following steps: (1) According to the composition, physical and chemical property characteristics of the titanium metal A to be connected, design and prepare a metal transition section B, and it is required that the metal transition section B has good chemical compatibility with the titanium metal A; (2) According to the compositions, physical and chemical properties of the metal transition section B and the solder D, design and prepare the cladding material R, requiring that the cladding material R has good plasticity, good chemical compatibility between the cladding material R and the metal transition section B, and good wettability between the cladding material R and the solder D; (3) Select a suitable cladding heat source and determine the corresponding cladding method, set the heat source process parameters, start the heat source equipment, and locally clad the surface of the metal transition section B with the cladding material R to prepare the cladding layer C, forming a bimetallic layer L composed of the cladding layer C and the metal transition section B; (4) Grind the surface of the cladding layer C, and use a stamping device to stamp the bimetallic layer L from one side of the cladding layer C, so that the bimetallic layer L forms a depression and a stamping small hole is formed in the center, preparing a bimetallic layer stamping structural part W; (5) Select a suitable connection heat source and determine the corresponding connection method, set the heat source process parameters, start the heat source equipment, and connect the titanium metal A and the metal transition section B in the bimetallic layer stamping structural part W to prepare a dissimilar material structural component for vacuum sealing.

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