Beryllium window welding apparatus with anti-splatter protection

Abstract

The application discloses a beryllium window welding processing device with anti-splashing protection, which comprises a vacuum furnace, an inert gas conveying system connected to the vacuum furnace, an auxiliary mechanism placed on a platform in the vacuum furnace, the auxiliary mechanism comprising an upper base and a lower base, a gasket, a lower cushion block, a window seat, filler metal, a beryllium foil, an upper cushion block and a gasket being sequentially arranged from bottom to top between the upper base and the lower base, a plurality of L-shaped clamps being oppositely arranged to connect the upper base and the lower base, at least two austenitic stainless steel metal expansion pads being transversely inserted into the gap between the clamps, a sealing cover being installed on the lower base, the beryllium foil, the filler metal and the brazing surface of the window seat being exposed in the local protection chamber, and the inert gas conveying system conveying inert gas into the protection chamber so that the brazing surface is in a flowing inert gas environment, and the application solves the problems that harmful substances are easy to splash and pollute and the pressing force cannot be self-adaptively adjusted during beryllium window brazing.

Description

Technical Field

[0001] This invention relates to the field of X-ray tube beryllium window welding technology, and in particular to a beryllium window welding processing apparatus with anti-splash protection. Background Technology

[0002] A beryllium window is an entrance window for X-rays, made by welding beryllium foil to a flange. The core technological challenge in manufacturing a beryllium window is achieving a highly reliable, airtight seal between the brittle and chemically reactive beryllium foil and the metal window base. Currently, the most common method is vacuum brazing.

[0003] However, beryllium is a toxic element. Under vacuum and high-temperature conditions, some components of the brazing filler metal (such as volatile elements in silver-based and copper-based filler metals) and the oxide layer on the beryllium surface may volatilize or splash. This can easily pose significant safety hazards to the environment and operators. Existing welding equipment typically only evacuates the entire furnace cavity, lacking localized and targeted protection for the core source of contamination—the brazing area; furthermore, in a vacuum environment, the evaporation of filler metal and beryllium surface molecules is more pronounced.

[0004] Secondly, beryllium foil is extremely thin and its strength decreases significantly at high temperatures. During brazing, a certain amount of pressure is typically required to promote filler metal spread. Traditional clamping mechanisms are often rigid or simply spring-loaded, unable to dynamically and adaptively adjust to the thermal expansion and contraction of the workpiece and fixture during the long brazing thermal cycle (lasting several hours). This can easily lead to excessive initial pressure cracking the beryllium foil, or pressure relaxation at high temperatures causing increased brazing gaps, resulting in voids and incomplete welds, ultimately affecting the airtightness and strength of the weld. Therefore, providing a beryllium window welding processing device with anti-splash protection is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] One objective of this invention is to provide a beryllium window welding processing device with anti-splash protection. This invention solves the problems of harmful substances easily splashing and contaminating the beryllium window during brazing in the prior art, and the inability to adaptively adjust the clamping force.

[0006] According to an embodiment of the present invention, a beryllium window welding processing apparatus with anti-splash protection includes a vacuum furnace. An inert gas delivery system is connected to a flange below the vacuum furnace. An auxiliary mechanism is placed on a platform inside the vacuum furnace. The auxiliary mechanism includes an upper base and a lower base. Between the upper and lower bases, from bottom to top, are arranged a gasket, a lower pad, a window seat, brazing filler metal, beryllium foil, an upper pad, and a gasket. Multiple L-shaped hooks are arranged in pairs to connect the upper and lower bases. At least two austenitic stainless steel expansion pads are laterally inserted into the gaps between corresponding upper and lower hooks to provide adaptive clamping force during thermal expansion at high temperatures. A sealing cover is installed on the lower base. The sealing cover and the lower base together form a local protective chamber, in which the brazing surfaces of the beryllium foil, brazing filler metal, and window seat are exposed. The inert gas delivery system communicates with the local protective chamber and is used to deliver inert gas into the protective chamber, ensuring that the brazing surfaces are in a flowing inert gas environment during the brazing process.

[0007] Furthermore, the inert gas delivery system includes an inlet pipe and an outlet pipe installed on the flange interface. The inlet pipe is connected to the inlet of the sealing cover, and the outlet pipe is connected to the outlet of the sealing cover. A preheating pipe is installed in the middle of the inlet pipe. Both the inlet pipe and the outlet pipe are made of austenitic stainless steel.

[0008] Furthermore, the preheating tube is a spiral coil made of austenitic stainless steel, and the preheating tube is equipped with a turbulence structure inside, which is used to force the inert gas inside the tube to form turbulence.

[0009] Furthermore, the hooks are fan-shaped hooks, evenly distributed on the outer periphery of the upper and lower bases. The hooks of the upper base and the hooks of the lower base are staggered in the circumferential direction, and the hooks of the two are facing opposite directions, so that the upper base and the lower base can achieve the staggered engagement through relative rotation.

[0010] Furthermore, the number of hooks is N sets, each set including at least one upper base hook and one lower base hook, and the central angle of the sector corresponding to each set of hooks does not exceed (180 / N)°.

[0011] Furthermore, the sealing cover is flange-connected to the lower base, and an oxygen-free copper gasket is sandwiched between them.

[0012] Furthermore, the sealing cover is a single-layer thin-walled structure with a wall thickness of 0.5mm to 2mm, and the outer surface of the sealing cover is treated with black oxidation to form a high emissivity surface.

[0013] Furthermore, the sealing cover, lower base, and upper base are all made of the same type of austenitic stainless steel, and their respective inner surfaces facing the protective chamber are all mirror-polished.

[0014] Furthermore, a vacuum brazing method for a beryllium window includes the following steps: S1: Outside the vacuum furnace, beryllium foil, brazing filler metal, window seat and pad are assembled between the upper base and the lower base in a preset order. The upper and lower fan-shaped L-shaped hooks are engaged by relative rotation, and metal expansion pads are inserted into the gap between the hooks to apply room temperature pre-tightening force. S2: Place the oxygen-free copper gasket on the mating surface between the sealing cover and the lower base. The sealing cover is connected to the lower base through a flange to complete the sealing of the local protective chamber. S3: Place the assembled device into the vacuum furnace, connect the inlet pipe and outlet pipe to the sealing cover, and then evacuate the furnace cavity to the preset vacuum level. S4: Through the inert gas delivery system, preheated argon gas is introduced into the sealed hood, so that at least the brazing surfaces of the beryllium foil, brazing filler metal and window seat are exposed to the microenvironment of the flowing argon gas, and a micro-positive pressure is formed in the sealed hood relative to the furnace cavity. S5: Heat the furnace cavity according to the preset temperature curve; during the heating and heat preservation process, the metal expansion pad expands due to heat to continuously increase the clamping force, and the flowing argon gas continuously blows the brazing surface to drive away the interface volatiles; S6: After brazing is completed, stop the argon gas supply and remove the workpiece after the furnace cools to the preset temperature.

[0015] The beneficial effects of this invention are: This invention utilizes an auxiliary mechanism and an inert gas delivery system. By forming a closed space with a lower base and a sealing cover, the core brazing surfaces of the beryllium foil and brazing filler metal are enclosed in a locally protected chamber filled with flowing argon gas. This maintains a flowing inert gas environment and a slight positive pressure within the chamber, effectively preventing harmful substances such as beryllium vapor and brazing filler metal spatter from escaping and contaminating the vacuum furnace. At the same time, the continuous airflow carries away and discharges any trace amounts of volatilized harmful substances, achieving dual safety protection from both the source and the path.

[0016] This invention utilizes an upper base, a lower base, a hook, and a metal expansion pad. It employs a unique combination of a "fan-shaped L-shaped hook + austenitic stainless steel metal expansion pad," which transforms the dimensional changes caused by the thermal expansion coefficient of the metal expansion pad into continuous traction between the upper and lower bases via the hook. This increases the clamping force between the upper and lower bases, and the clamping force changes with temperature, perfectly compensating for the gap changes between the workpiece and the fixture caused by thermal expansion. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1This invention provides a beryllium window welding processing apparatus with anti-splash protection; Figure 2 This is a cross-sectional view of a beryllium window welding processing device with anti-splash protection proposed in this invention.

[0018] Figure 3 This is a schematic diagram of the auxiliary mechanism structure of a beryllium window welding processing device with anti-splash protection proposed in this invention.

[0019] Figure 4 This is an exploded view of the auxiliary mechanism of a beryllium window welding processing device with anti-splash protection proposed in this invention.

[0020] Figure 5 This is a cross-sectional view of the auxiliary mechanism of a beryllium window welding processing device with anti-splash protection proposed in this invention.

[0021] Figure 6 This is a schematic diagram showing the connection relationship between the upper base, lower base, and metal expansion block of a beryllium window welding processing device with anti-splash protection proposed in this invention.

[0022] In the diagram: 1. Vacuum furnace; 2. Inert gas delivery system; 21. Inlet pipe; 22. Outlet pipe; 23. Preheating pipe; 3. Auxiliary mechanism; 31. Upper base; 32. Lower base; 33. Hook; 34. Metal expansion pad; 35. Sealing cover; 351. Oxygen-free copper washer; 4. Gasket; 5. Lower pad; 6. Window seat; 7. Brazing filler metal; 8. Beryllium foil; 9. Upper pad. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0024] refer to Figures 1 to 6The invention includes a vacuum furnace 1, with an inert gas delivery system 2 connected to a flange below the vacuum furnace 1. An auxiliary mechanism 3 is placed on a platform inside the vacuum furnace 1. The vacuum furnace 1 is a high-temperature vacuum welding device in the prior art, with a vacuum port, heating element, and temperature control system on its furnace body. In this invention, the inert gas delivery system 2 is used to provide high-purity inert gas, preferably argon, into the furnace. The auxiliary mechanism 3 includes an upper base 31 and a lower base 32. From bottom to top, the upper base 31 and the lower base 32 are arranged a gasket 4, a lower pad 5, a window seat 6, a brazing filler metal 7, a beryllium foil 8, an upper pad 9, and a gasket 4. Multiple L-shaped hooks 33 are arranged in pairs to connect the upper base 31 and the lower base 32. At least two austenitic stainless steel metal expansion pads 34 are inserted laterally into the gaps between the corresponding upper and lower hooks to provide adaptive clamping force for thermal expansion at high temperatures. The metal expansion pads 34 are preferably made of 304L austenitic stainless steel, whose coefficient of thermal expansion is higher than that of the upper base 31 and the lower base 32. The material of the base 32 expands significantly during heating, effectively compensating for the pressure relaxation caused by thermal softening of various components at high temperatures. This ensures that the beryllium foil 8 and the window seat 6 maintain a stable and sufficient clamping force during brazing, preventing the brazing filler metal 7 from overflowing and splashing. A sealing cover 35 is installed on the lower base 32, which together with the lower base 32 forms a local protective chamber. The brazing surfaces of the beryllium foil 8, brazing filler metal 7, and window seat 6 are exposed in this local protective chamber. The inert gas delivery system 2 is connected to the local protective chamber and is used to deliver inert gas into the protective chamber, so that the brazing surfaces are in a flowing inert gas environment during brazing. The inert gas delivery system 2 is also connected to the local protective chamber and is used to deliver high-purity argon gas into the protective chamber, so that the brazing surfaces are in a flowing inert gas environment during brazing. This flowing atmosphere can continuously carry away low-melting-point impurities and adsorbed gases volatilized from the brazing interface, effectively preventing them from condensing in the weld area to form splashes or pores, thus achieving anti-splash protection.

[0025] In this embodiment, the gasket 4, lower gasket 5, window seat 6, brazing filler metal 7, beryllium foil 8, upper gasket 9, and gasket 4 are sequentially placed between the lower base 32 and the upper base 31, and the intermediate workpiece assembly is clamped by L-shaped buckles and metal expansion pads 34. At room temperature, the metal expansion pads 34 provide an initial, gentle pre-tightening force to ensure that each layer of workpiece adheres. During the heating process of brazing, the volume of the metal expansion pads 34 will increase significantly, thereby converting this expansion into an axial clamping force under the constraint of the hooks 33. The higher the temperature, the greater the clamping force. This force dynamically compensates for the change in the gap between workpiece layers caused by thermal expansion, ensuring the stability of the brazing gap. At the same time, the connection between the inert gas delivery system 2 and the local protection chamber allows the flowing high-purity argon gas to discharge harmful substances volatilized during the brazing process, effectively preventing the escape of toxic beryllium vapor.

[0026] refer to Figure 2 The inert gas delivery system 2 includes an inlet pipe 21 and an outlet pipe 22 installed on the flange interface. The inlet pipe 21 is connected to the inlet of the sealing cover 35, and the outlet pipe 22 is connected to the outlet of the sealing cover 35. One end of the inlet pipe 21 is connected to an external gas source for introducing high-purity argon gas, and the other end of the outlet pipe 22 leads to the outside of the furnace and can be connected to the tail gas treatment device. A preheating pipe 23 is installed in the middle of the inlet pipe. Both the inlet pipe 21 and the outlet pipe 22 are made of austenitic stainless steel to ensure the cleanliness and temperature resistance of the pipes.

[0027] refer to Figure 2 The preheating tube 23 is a spiral coil made of austenitic stainless steel. The spiral structure increases the heat exchange area while ensuring a compact structure. The preheating tube 23 is equipped with a turbulence structure to force the inert gas inside the tube to form turbulence. This turbulence structure can be equipped with baffles, blocks, etc., which can force the inert gas flowing through it to change from laminar flow to forced turbulence, greatly improving the heat exchange efficiency between the gas and the tube wall. This allows the gas to be preheated quickly and uniformly to near the brazing temperature before entering the sealing cover 35, thereby avoiding the impact of cold air on the temperature field of the welding area.

[0028] refer to Figure 3 , 4 5, 6, The hooks 33 are fan-shaped hooks 33, which are evenly distributed on the outer periphery of the upper base 31 and the lower base 32. The hooks 33 of the upper base 31 and the hooks 33 of the lower base 32 are staggered in the circumferential direction, and the hooks of the two are facing opposite directions, so that the upper base 31 and the lower base 32 can achieve the staggered engagement through relative rotation. This rotating buckle structure is easy to assemble and disassemble quickly, and does not require external fasteners, thus avoiding interference with the temperature field inside the furnace.

[0029] refer to Figure 3 , 4 5, 6, The number of hooks 33 is N sets, each set including at least one upper base 31 hook 33 and one lower base 32 hook 33, and the central angle of the sector corresponding to each set of hooks 33 does not exceed (180 / N)°. Taking N=3 as an example, the central angle of each set of hooks 33 is not greater than 60°. This angle limit ensures that the upper and lower hooks 33 can reliably engage and provide uniform circumferential constraint force during the rotational fastening process, while preventing the hooks 33 from disengaging due to excessive rotation angle.

[0030] refer to Figure 3The sealing cover 35 is flanged to the lower base 32, and an oxygen-free copper gasket 351 is sandwiched between them. The oxygen-free copper gasket 351 has good plastic deformation ability at high temperature, which can effectively compensate for the thermal deformation difference of the flange surface, ensure the sealing reliability at high temperature, and ensure the reliable sealing of the local protective chamber by fastening the flange bolts, thus ensuring the stability of argon gas flow.

[0031] refer to Figure 3 The sealing cover 35 is a single-layer thin-walled structure with a wall thickness of 0.5mm to 2mm. The outer surface of the sealing cover 35 is treated with black oxide to form a high emissivity surface. The black oxide layer can significantly improve the radiative heat transfer coefficient of the surface of the sealing cover 35, enabling it to absorb radiant heat more efficiently in the vacuum furnace 1, thereby accelerating the heating and homogenizing the temperature field. At the same time, the thin-walled structure reduces the heat capacity, which is beneficial for the rapid cooling of the sealing cover 35 and the internal workpieces in the furnace.

[0032] refer to Figure 3 The sealing cover 35, the lower base 32, and the upper base 31 are all made of the same type of austenitic stainless steel to ensure consistent thermal expansion and avoid excessive thermal stress caused by material thermal mismatch at high temperatures. Furthermore, the inner surfaces of each of them facing the protective chamber are all mirror-polished. The mirror-polished inner walls can reduce the adsorption of gas molecules and the adhesion of particulate matter, while reducing the absorption of radiant heat, avoiding local overheating, and helping to maintain the purity of the atmosphere and the uniformity of the temperature in the chamber.

[0033] This invention also provides a vacuum brazing method for a beryllium window, specifically including the following steps: S1: In a clean environment outside the vacuum furnace 1, place the gasket 4, lower gasket 5, window seat 6, brazing filler metal 7, beryllium foil 8, upper gasket 9, and gasket 4 in sequence between the lower base 32 and the upper base 31; then, by rotating the upper base 31 or the lower base 32, make the interlocking fan-shaped L-shaped hooks 33 interlock; then, insert the metal expansion washer into the gap of the corresponding hook 33 so that it can generate a certain elastic preload at room temperature, thus completing the fixation and preloading of the workpiece; S2: Place the oxygen-free copper gasket 351 into the sealing groove of the lower base 32, then cover the lower base 32 with the sealing cover 35 and fasten it with flange bolts to ensure that the local protection chamber is reliably sealed. S3: Move the fully assembled auxiliary mechanism 3 into the vacuum furnace 1 and place it stably on the placement platform. Connect the air inlet pipe 21 to the air inlet of the sealing cover 35 inside the furnace, connect the air outlet pipe 22 to the air outlet, close the furnace door, and start the vacuum system to evacuate the furnace cavity until the preset vacuum level is reached. S4: High-purity argon gas is continuously introduced into the sealing cover 35 through the inert gas delivery system 2 and the gas inlet pipe 21. When the argon gas flows through the preheating pipe 23, it is rapidly heated to the predetermined temperature and then enters the local protection chamber at a set flow rate. The flowing hot argon gas continuously blows across the brazing surfaces of the beryllium foil 8, the brazing filler metal 7 and the window seat 6, carrying away any trace amounts of volatile substances that may be present. Furthermore, by continuously introducing argon gas, the air inside the local protection chamber can be discharged. S5: Start the heating system of vacuum furnace 1 and heat up according to the preset brazing temperature curve. During the heating and holding stages, the metal expansion pad 34 thermally expands as the furnace temperature rises, continuously and steadily increasing the clamping force on the workpiece assembly. At the same time, the flowing hot argon gas continuously protects and purifies the brazing surface. The brazing temperature and time are set according to the type of brazing filler metal 7. For example, for AgCu28 brazing filler metal 7, the temperature can be raised to 780-800℃ and held for 10-20 minutes. S6: After the brazing and heat preservation are completed, stop heating and stop the argon gas supply (or maintain a small flow rate until the temperature drops); allow the auxiliary mechanism 3 to cool naturally with the furnace or cool to the preset temperature under program control; finally, open the vacuum furnace 1, take out the auxiliary mechanism 3, disassemble the sealing cover 35 and the upper and lower bases 32, and you can obtain the welded beryllium window assembly.

[0034] Working principle: First, in a clean environment outside the vacuum furnace 1, the beryllium foil 8, window seat 6, and brazing filler metal 7 to be welded are pickled to remove the oxide film and oil stains on their surfaces, thereby ensuring a clean interface and good wetting during subsequent brazing. After pickling, the gasket 4, lower gasket 5, window seat 6, brazing filler metal 7, beryllium foil 8, upper gasket 9, and another gasket 4 are placed sequentially from bottom to top between the lower base 32 and the upper base 31. Then, by rotating the upper base 31 or the lower base 32 relative to each other, the circumferentially staggered L-shaped fan-shaped hooks 33 are interlocked, initially locking each layer of workpieces. Next, at least two austenitic stainless steel expansion pads 34 are inserted laterally into the gaps between the corresponding upper and lower hooks 33, using their slight interference fit at room temperature to apply an initial gentle pre-tightening force, ensuring that each workpiece layer is tightly bonded at room temperature.

[0035] After the workpiece assembly is completed, the oxygen-free copper gasket 351 is placed on the lower base 32, and then the sealing cover 35 is placed on the lower base 32 and fastened through the flange, so that the sealing cover 35 and the lower base 32 together form a local protective chamber, ensuring that the chamber is reliably sealed, and the brazing surfaces of the beryllium foil 8, the brazing filler metal 7 and the window seat 6 are all exposed in the local protective chamber.

[0036] The fully assembled auxiliary mechanism 3 is placed on the placement platform inside the vacuum furnace 1. The inlet pipe 21 of the inert gas delivery system 2 is connected to the inlet of the sealing cover 35, and the outlet pipe 22 is connected to the outlet of the sealing cover 35. After closing the furnace door of the vacuum furnace 1, the vacuum system is started to evacuate the furnace cavity to the preset vacuum level. Then, high-purity argon gas is continuously introduced into the sealing cover 35 through the inert gas delivery system 2 and the inlet pipe 21. When the argon gas flows through the preheating pipe 23 in the middle of the inlet pipe 21, the preheating pipe 23 is a single... The spiral coil made of austenitic stainless steel has an internal turbulence structure that can change the laminar flow of inert gas inside the tube into forced turbulence, greatly improving heat exchange efficiency. This allows the argon gas to be rapidly preheated to near the brazing temperature. The preheated hot argon gas then enters the local protection chamber and continuously blows the brazing surface, carrying away any trace amounts of potentially volatile harmful substances and discharging them through the exhaust pipe 22 to the external exhaust gas treatment device. At the same time, a slight positive pressure is formed in the chamber relative to the furnace cavity, effectively preventing beryllium vapor and brazing filler metal 7 spatter from escaping and contaminating the vacuum furnace 1 and the environment.

[0037] Next, the heating system of vacuum furnace 1 is started, and the furnace cavity is heated and kept warm according to the preset temperature curve. During the heating and holding process, since the metal expansion pad 34 is made of 304L austenitic stainless steel, its volume increases significantly after heating. This expansion is converted into a continuously increasing axial clamping force under the constraint of hook 33, which dynamically compensates for the gap changes caused by the thermal expansion or softening of the workpiece and fixture at high temperature. This ensures that the beryllium foil 8 and the window seat 6 maintain a stable and sufficient clamping force during the brazing process, and avoids the increase in brazing gap due to pressure relaxation. At the same time, the flowing hot argon gas continuously blows the brazing surface, timely removing low melting point impurities and adsorbed gases volatilized from the interface, preventing them from condensing in the weld area to form spatter or pores, thus achieving anti-splash protection.

[0038] During this process, the sealing cover 35 is a single-layer thin-walled structure. Its outer surface is treated with black oxidation to form a high emissivity surface, which can efficiently absorb radiant heat in the vacuum furnace 1, accelerate the heating of the internal workpiece and homogenize the temperature field. At the same time, the sealing cover 35, the lower base 32 and the upper base 31 are all made of the same type of austenitic stainless steel to ensure the consistency of thermal expansion at high temperature. Moreover, each inner surface is mirror polished to reduce the adsorption of gas molecules and the adhesion of particulate matter, and maintain the purity of the atmosphere and the uniformity of temperature in the chamber.

[0039] After the brazing and heat preservation are completed, heating is stopped, and the argon gas supply is stopped or kept at a low flow rate until the temperature drops, allowing the auxiliary mechanism 3 to cool naturally with the furnace or to be cooled to the preset temperature by program control; finally, the vacuum furnace 1 is opened, the auxiliary mechanism 3 is taken out, and the sealing cover 35, the upper base 31 and the lower base 32 are disassembled to obtain the welded beryllium window assembly.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A beryllium window welding processing device with anti-splash protection, characterized in that, The system includes a vacuum furnace (1), with an inert gas delivery system (2) connected to the flange below the vacuum furnace (1). An auxiliary mechanism (3) is placed on a platform inside the vacuum furnace (1). The auxiliary mechanism (3) includes an upper base (31) and a lower base (32). From bottom to top, the upper base (31) and the lower base (32) are arranged a gasket (4), a lower pad (5), a window seat (6), brazing filler metal (7), beryllium foil (8), an upper pad (9), and a gasket (4). Multiple L-shaped hooks (33) are arranged in pairs to connect the upper base (31) and the lower base (32). At least Two austenitic stainless steel expansion pads (34) are inserted laterally into the gap between the corresponding upper and lower clips to provide adaptive clamping force for thermal expansion at high temperature; a sealing cover (35) is installed on the lower base (32), and the sealing cover (35) and the lower base (32) together form a local protective chamber, in which the brazing surfaces of the beryllium foil (8), brazing filler metal (7) and window seat (6) are exposed; the inert gas delivery system (2) is connected to the local protective chamber and is used to deliver inert gas into the protective chamber so that the brazing surfaces are in a flowing inert gas environment during the brazing process.

2. The beryllium window welding processing device with anti-splash protection according to claim 1, characterized in that, The inert gas delivery system (2) includes an inlet pipe (21) and an outlet pipe (22) installed on the flange interface. The inlet pipe (21) is connected to the inlet of the sealing cover (35), and the outlet pipe (22) is connected to the outlet of the sealing cover (35). A preheating pipe (23) is installed in the middle of the inlet pipe. Both the inlet pipe (21) and the outlet pipe (22) are made of austenitic stainless steel.

3. The beryllium window welding processing device with anti-splash protection according to claim 2, characterized in that, The preheating tube (23) is a spiral coil made of austenitic stainless steel. The preheating tube (23) is equipped with a turbulence structure inside, which is used to force the inert gas inside the tube to form turbulence.

4. The beryllium window welding processing device with anti-splash protection according to claim 1, characterized in that, The hooks (33) are fan-shaped hooks (33) and are evenly distributed on the outer periphery of the upper base (31) and the lower base (32). The hooks (33) of the upper base (31) and the hooks (33) of the lower base (32) are staggered in the circumferential direction, and the hooks of the two are facing opposite directions, so that the upper base (31) and the lower base (32) can achieve the staggered engagement through relative rotation.

5. The beryllium window welding processing device with anti-splash protection according to claim 1, characterized in that, The number of hooks (33) is N sets, each set including at least one upper base (31) hook (33) and one lower base (32) hook (33), and the central angle of the sector corresponding to each set of hooks (33) does not exceed (180 / N)°.

6. The beryllium window welding processing apparatus with anti-splash protection according to claim 1, characterized in that, The sealing cover (35) is flanged to the lower base (32), and an oxygen-free copper gasket (351) is sandwiched between them.

7. The beryllium window welding processing apparatus with anti-splash protection according to claim 1, characterized in that, The sealing cover (35) is a single-layer thin-walled structure with a wall thickness of 0.5mm to 2mm. The outer surface of the sealing cover (35) is treated with black oxidation to form a high emissivity surface.

8. The beryllium window welding processing apparatus with anti-splash protection according to claim 1, characterized in that, The sealing cover (35), lower base (32), and upper base (31) are all made of the same type of austenitic stainless steel, and their inner surfaces facing the protective chamber are all mirror polished.

9. A vacuum brazing method for a beryllium window, using the apparatus as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Outside the vacuum furnace (1), beryllium foil (8), brazing filler metal (7), window seat (6) and pad are assembled between the upper base (31) and the lower base (32) in a preset order. The upper and lower fan-shaped L-shaped hooks (33) are fastened by relative rotation, and metal expansion pads (34) are inserted into the gap of the hooks (33) to apply room temperature pre-tightening force. S2: Place the oxygen-free copper gasket (351) on the mating surface between the sealing cover (35) and the lower base (32). The sealing cover (35) is connected to the lower base (32) through a flange to complete the sealing of the local protective chamber. S3: Place the assembled device into the vacuum furnace (1), connect the inlet pipe and outlet pipe to the sealing cover (35), and then evacuate the furnace cavity to the preset vacuum level. S4: Through the inert gas delivery system (2), preheated argon gas is introduced into the sealing cover (35) through the preheating tube (23) so that at least the brazing surfaces of the beryllium foil (8), the brazing filler metal (7) and the window seat (6) are exposed to the microenvironment of the flowing argon gas, and a micro-positive pressure relative to the furnace cavity is formed in the sealing cover (35); S5: Heat the furnace cavity according to the preset temperature curve; during the heating and heat preservation process, the metal expansion pad (34) is heated and expands to continuously increase the clamping force, and the flowing argon gas continuously blows the brazing surface to drive away the interface volatiles; S6: After brazing is completed, stop the argon gas supply and remove the workpiece after the furnace cools to the preset temperature.

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