A diffusion welded structure of molybdenum and titanium alloys

Abstract

This invention relates to the field of diffusion welding technology and discloses a diffusion welding structure for molybdenum and titanium alloys. The structure includes a vacuum diffusion welding furnace, employing a stable magnetic field environment to suppress adverse phenomena. A magnetic field compensation unit adjusts the height of a ring track via four electric push rods. A samarium-cobalt permanent magnet slides within the ring track, interacting with symmetrically installed electromagnetic coils. The superposition of the two symmetrical magnetic fields, when properly distributed, stabilizes the permanent magnet's force, allowing it to move smoothly along the ring track and ensuring a stable magnetic field distribution. Simultaneously, the interaction of the magnetic fields affects the trajectory of current electrons between the electrodes and pure copper, causing them to form a spiral motion, effectively suppressing partial discharge and electron accumulation. Furthermore, a Hall sensor follows the movement of the permanent magnet, capturing real-time magnetic field change data and feeding it back to the controller. The controller automatically adjusts the power parameters of the electromagnetic coils accordingly, further ensuring magnetic field stability and creating stable magnetic field conditions for the welding process.

Description

Technical Field

[0001] This invention relates to the field of diffusion welding technology, specifically to a diffusion welding structure of molybdenum and titanium alloy. Background Technology

[0002] The development of molybdenum-titanium alloy diffusion welding technology stems from the material application requirements and the limitations of traditional welding methods. Under the stringent requirements for material performance in aerospace, electronics and other fields, it has become a key technology to solve the problem of material joining. Combining molybdenum and titanium alloys can integrate the properties of both and meet the special needs of aerospace, electronics, chemical and other fields for materials in extreme environments.

[0003] According to Chinese Patent Publication No. CN118808864A, this patent relates to a diffusion welding process for titanium-steel dissimilar metal components. The process involves precision machining and cleaning of the titanium and steel surfaces to be welded, followed by assembly into a rigid mold. The components are then placed in a vacuum diffusion furnace for diffusion welding. During the diffusion welding process, the rigid mold and axial diffusion welding pressure place the diffusion-welded joint under triaxial compressive stress, resulting in a titanium-steel dissimilar metal component. This process allows for more complete plastic flow and element diffusion at the interface, thereby obtaining a titanium-steel welded joint that is free of porosity and cracks, has a reliable interface, and exhibits excellent performance.

[0004] However, due to the differences in thermal conductivity and specific heat capacity between molybdenum and titanium alloys, it is difficult to achieve absolute uniformity in the temperature field generated in a vacuum cavity using radiative heating. Molybdenum, which heats up faster, may reach its suitable diffusion temperature earlier, and its atoms begin to diffuse actively. Meanwhile, the titanium alloy, which heats up more slowly, has not yet fully reached its ideal diffusion state. This results in inconsistent atomic diffusion levels between the two alloys, leading to uneven elemental distribution at the weld joint, affecting the uniformity of the microstructure, and reducing the mechanical properties of the joint. Therefore, a diffusion welding structure for molybdenum and titanium alloys is proposed to address the aforementioned problems. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a diffusion welding structure for molybdenum and titanium alloys, which solves the problem that the different heating efficiencies of molybdenum and titanium alloys lead to uneven element distribution at the weld joint, affecting the uniformity of the microstructure and reducing the mechanical properties of the joint.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a diffusion welding structure for molybdenum and titanium alloys, comprising a vacuum diffusion welding furnace, a vacuum chamber installed inside the furnace cavity of the vacuum diffusion welding furnace, a mounting part disposed on the vacuum chamber for mounting diffusion welding tools, a magnetic field compensation part installed on the vacuum chamber for stable distribution of magnetic field superposition and suppression of partial discharge and electron accumulation, a heat compensation part installed on the mounting part for balancing the heating efficiency of the contact surface between molybdenum and titanium alloys, and a sealing part installed at the opening of the vacuum chamber for sealing the vacuum chamber and providing thermal radiation.

[0007] Preferably, the mounting part includes a shaft hole, which is located in the middle of the top of the vacuum chamber. A vacuum valve is provided on one side of the top of the vacuum chamber, and an inert gas valve is provided on the other side of the top of the vacuum chamber. A worktable is installed in the center of the bottom of the inner wall of the vacuum chamber. Rod holes are provided at the four corners of the top of the vacuum chamber, and two insulation holes are provided on the back of the vacuum chamber.

[0008] Preferably, a hydraulic cylinder is installed on the inner wall of the shaft hole, a titanium alloy body is provided on the top of the worktable, a molybdenum body is provided above the titanium alloy body, and pure copper is provided between the titanium alloy body and the molybdenum body.

[0009] Preferably, the magnetic field compensation unit includes four electric actuators, which are respectively installed at the four corners of the top of the vacuum chamber. The inner rods of the four electric actuators slide through the inner walls of the four rod holes. Each inner rod end of the four electric actuators is fixedly connected to a support arm. The four support arms are slidably connected to the four corners of the inner wall of the vacuum chamber. A ring track is fixedly connected between the four support arms. A samarium cobalt permanent magnet is slidably connected in the track groove of the ring track. Two electromagnetic coils are symmetrically installed in the furnace cavity of the vacuum diffusion welding furnace.

[0010] Preferably, the two electromagnetic coils are located on opposite sides of the outer wall of the vacuum cavity, and a clamping plate is fixedly connected to the samarium cobalt permanent magnet. A Hall sensor is clamped onto the clamping plate, and the Hall sensor is electrically connected to the two electromagnetic coils.

[0011] Preferably, the thermal compensation part includes an electrode, one end of which has a sliding hole, and a guide plate is slidably connected to the inner wall of the sliding hole.

[0012] Preferably, there are two thermal compensation parts, and the ends of the two electrodes in the two thermal compensation parts away from the guide plate are respectively fixed through two insulating holes, and the two insulating holes are staggered vertically.

[0013] Preferably, there are two pure copper electrodes, which are respectively bonded to the titanium alloy body and the molybdenum body, and are bonded to each other. The two pure copper electrodes, the titanium alloy body, and the molybdenum body are aligned with each other. The guide plate on one electrode is bonded to one side of the pure copper electrode, and the guide plate on the other electrode is bonded to one side of the other pure copper electrode.

[0014] Preferably, the sealing part includes a sealing door, which is hinged to the opening of the vacuum chamber. A compression spring is connected to the front of the sealing door, and the sealing door abuts against the furnace door of the vacuum diffusion welding furnace through the compression spring. A heat radiation pipe is installed on the back of the sealing door.

[0015] Preferably, a control panel is installed on the outer wall of the furnace door of the vacuum diffusion welding furnace. The control panel is electrically connected to a vacuum valve, an inert gas valve, four electric push rods, a Hall sensor, two electromagnetic coils, and two electrodes.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides a diffusion weld structure of molybdenum and titanium alloy, which has the following beneficial effects: 1. This diffusion welding structure of molybdenum and titanium alloy employs a stable magnetic field environment to suppress undesirable phenomena. The magnetic field compensation unit adjusts the height of the annular track through four electric push rods. The samarium cobalt permanent magnet slides within the annular track and interacts with symmetrically installed electromagnetic coils. The superposition of the two symmetrical magnetic fields, when properly distributed, stabilizes the permanent magnet, allowing it to move smoothly along the annular track and ensuring a stable magnetic field distribution. Simultaneously, the interaction of the magnetic fields affects the trajectory of current electrons between the electrodes and pure copper, causing them to form a spiral motion, effectively suppressing partial discharge and electron accumulation. Furthermore, Hall sensors follow the movement of the permanent magnet, capturing real-time magnetic field change data and feeding it back to the controller. The controller then automatically adjusts the power parameters of the electromagnetic coils to further ensure magnetic field stability, creating stable magnetic field conditions for the welding process.

[0017] 2. This diffusion welding structure of molybdenum and titanium alloy employs optimized heating efficiency to improve welding quality. The two electrodes of the heat compensation section heat the two pure copper intermediate layers respectively. The temperature is adjusted according to the different thermal conductivity and specific heat capacity of molybdenum and titanium alloys, so that the heating rate of the contact surface of the two materials tends to be balanced. This can more efficiently provide a suitable thermal environment for molybdenum and titanium alloys, promote atomic diffusion, and make the mutual diffusion of copper, molybdenum and titanium atoms more complete. This reduces the inhomogeneity of composition and structure at the weld joint, improves the mechanical properties of the weld joint, enhances the load-bearing capacity of the weld joint, reduces the risk of cracking, debonding and other problems during use, and improves the reliability and service life of the welded structure.

[0018] 3. The diffusion welding structure of molybdenum and titanium alloy is designed to enhance safety and avoid the hazards of discharge. The electrodes and pure copper are connected by a sliding contact method. When a discharge occurs, the instantaneously changing current generates a strong magnetic field. According to Lenz's law, the magnetic field generated by the discharge in the vacuum cavity will oppose the magnetic field generated by the electromagnetic coil and permanent magnet. This characteristic is used to push the electrodes to slide and spring away, so that the electrodes and pure copper are quickly separated, avoiding continuous discharge from damaging the equipment and materials, and greatly improving the safety of the welding process.

[0019] 4. The diffusion welding structure of this molybdenum and titanium alloy adopts improved welding conditions to ensure welding effect. The sealing door of the sealing part is tightly abutted against the furnace door of the vacuum diffusion welding furnace by a compression spring to prevent the high-temperature expansion gas inside the vacuum chamber from creating gaps and enhance the sealing of the vacuum working environment. The heat radiation pipe on the back of the sealing door, together with the electrode heating, heats up the molybdenum and titanium alloy to promote atomic diffusion. The inert gas valve can inject inert gas to displace residual oxygen in the chamber and form an inert gas protective atmosphere around the weldment to prevent the material from oxidizing at high temperature, avoid the oxide layer from hindering atomic diffusion, and ensure the quality of the weld joint. The inert gas can also improve heat transfer, absorb the energy generated by the discharge, reduce the discharge intensity and frequency, reduce interference with the welding process, and ensure smooth welding.

[0020] 5. The diffusion welding structure of molybdenum and titanium alloy adopts automated control to improve the convenience of operation. The control panel on the outer wall of the vacuum diffusion welding furnace door is electrically connected to components such as vacuum valve, inert gas valve, electric actuator, Hall sensor, electromagnetic coil and electrodes, realizing automated control of diffusion welding operation. Operators can conveniently control the operation of each component through the control panel, such as adjusting the vacuum degree, controlling the electrode heating temperature, adjusting the magnetic field parameters, etc., which improves the convenience and accuracy of operation, reduces human operation error, and improves the overall efficiency of welding operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a diffusion-welded structure of molybdenum and titanium alloy proposed in this invention. Figure 2 This is a cross-sectional view inside a vacuum diffusion welding furnace of a molybdenum-titanium alloy diffusion welding structure proposed in this invention. Figure 3 This is a schematic diagram of the structure of a vacuum cavity for diffusion welding of molybdenum and titanium alloy proposed in this invention; Figure 4 This is a schematic diagram of the mounting part of a diffusion welding structure for molybdenum and titanium alloy proposed in this invention. Figure 5 This is a schematic diagram of the magnetic field compensation part of a diffusion welding structure of molybdenum and titanium alloy proposed in this invention. Figure 6This invention proposes a diffusion-welded structure for molybdenum and titanium alloys. Figure 5 Enlarged view of A in the middle; Figure 7 This is a schematic diagram of the heat compensation part and pure copper structure of the diffusion welding structure of molybdenum and titanium alloy proposed in this invention. Figure 8 This invention proposes a diffusion-welded structure for molybdenum and titanium alloys. Figure 7 A magnified view of B in the middle.

[0022] In the diagram: 1. Vacuum diffusion welding furnace; 2. Vacuum chamber; 3. Mounting part; 31. Shaft hole; 32. Vacuum valve; 33. Inert gas valve; 34. Worktable; 35. Rod hole; 36. Insulation hole; 4. Magnetic field compensation part; 41. Electric actuator; 42. Support arm; 43. Circular track; 44. Samarium cobalt permanent magnet; 45. Clamping plate; 46. Hall sensor; 47. Electromagnetic coil; 5. Thermal compensation part; 51. Electrode; 52. Guide plate; 6. Sealing part; 61. Sealing door; 62. Compression spring; 63. Heat radiation pipeline; 7. Hydraulic cylinder; 8. Titanium alloy body; 9. Molybdenum body; 10. Pure copper; 11. Control panel. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-8 This invention provides a technical solution: a diffusion welding structure for molybdenum and titanium alloys, comprising a vacuum diffusion welding furnace 1, a vacuum chamber 2 installed inside the furnace cavity of the vacuum diffusion welding furnace 1, a mounting part 3 disposed on the vacuum chamber 2 for mounting diffusion welding tools, a magnetic field compensation part 4 installed on the vacuum chamber 2 for superimposing and stabilizing the magnetic field distribution and suppressing partial discharge and electron accumulation, a heat compensation part 5 installed on the mounting part 3 for balancing the heating efficiency of the contact surface between the molybdenum and titanium alloys, and a sealing part 6 installed at the opening of the vacuum chamber 2 for sealing the vacuum chamber 2 and providing thermal radiation.

[0025] In this invention, in order to reasonably install the tools and equipment required for diffusion welding, the mounting part 3 includes a shaft hole 31, which is opened in the middle of the top of the vacuum chamber 2. A vacuum valve 32 is provided on one side of the top of the vacuum chamber 2, and an inert gas valve 33 is provided on the other side of the top of the vacuum chamber 2. A worktable 34 is installed in the center of the bottom of the inner wall of the vacuum chamber 2. Rod holes 35 are opened at the four corners of the top of the vacuum chamber 2. Two insulation holes 36 are opened on the back of the vacuum chamber 2. A hydraulic cylinder 7 is installed on the inner wall of the shaft hole 31. A titanium alloy body 8 is provided on the top of the worktable 34. A molybdenum body 9 is provided above the titanium alloy body 8. Pure copper 10 is provided between the titanium alloy body 8 and the molybdenum body 9. High-purity oxygen-free copper with a purity of not less than 99.95% is selected to ensure good electrical and thermal conductivity.

[0026] In this embodiment, in order to stabilize the ring motion of the permanent magnet through the superposition of magnetic fields and to compensate for changes in the magnetic field at high temperatures through the ring motion, the magnetic field compensation unit 4 includes four electric push rods 41. The four electric push rods 41 are respectively installed at the four corners of the top of the vacuum chamber 2. The inner rods of the four electric push rods 41 slide through the inner walls of the four rod holes 35. The ends of the inner rods of the four electric push rods 41 are fixedly connected to support arms 42. The four support arms 42 are respectively slidably connected to the four corners of the inner wall of the vacuum chamber 2. A ring track 43 is fixedly connected between the four support arms 42. Samarium cobalt permanent magnets 44, such as SmCo5 or Sm2Co17, are slidably connected in the track grooves of the ring track 43. They can maintain a certain magnetism at high temperatures. Two electromagnetic coils 47 are symmetrically installed in the furnace cavity of the vacuum diffusion welding furnace 1. Two electromagnetic coils 47 are located on opposite sides of the outer wall of the vacuum chamber 2. A clamping plate 45 is fixedly connected to the samarium cobalt permanent magnet 44, and a Hall sensor 46 is clamped onto the clamping plate 45. A high-temperature resistant Hall effect magnetic field sensor, such as Honeywell's SS495A1, is selected. It can work in high-temperature environments and has high sensitivity and stability. The Hall sensor 46 is electrically connected to the two electromagnetic coils 47. The two electromagnetic coils 47 need to be connected to an adjustable power supply through a controller, such as the ITECH-IT6500C series programmable DC power supply. It can quickly adjust the output parameters according to the controller's instructions. The controller, such as the Siemens S7-1200 series PLC, can adjust the power supply parameters of the electromagnetic coils 47 in real time based on the data fed back by the Hall sensor 46.

[0027] It is worth noting that, in order to provide a suitable thermal environment for the diffusion welding of molybdenum and titanium alloy by controlling the temperature rise rate and final temperature of the welding intermediate layer, promoting atomic diffusion and improving welding efficiency, the heat compensation part 5 of this case includes an electrode 51 made of tungsten copper alloy, which has good electrical conductivity, thermal conductivity and high temperature resistance. One end of the electrode 51 is provided with a sliding hole, and a guide plate 52 is slidably connected to the inner wall of the sliding hole. There are two heat compensation parts 5. The ends of the two electrodes 51 in the two heat compensation parts 5 that are away from the guide plate 52 are respectively fixed through two insulating holes 36. The two insulating holes 36 are staggered vertically. The through ends of the two electrodes 51 need to be connected to a power supply, such as a TDK-LambdaZ+ series programmable DC power supply.

[0028] In order to more reasonably control the temperature of molybdenum and titanium alloy separately and balance their heating rates, there are two pure copper 10s in this case. The two pure copper 10s are respectively attached to the titanium alloy body 8 and the molybdenum body 9. The two pure copper 10s are attached to each other and are aligned with each other between the two pure copper 10s, the titanium alloy body 8 and the molybdenum body 9. The guide plate 52 on one electrode 51 is attached to one side of the pure copper 10, and the guide plate 52 on the other electrode 51 is attached to one side of the other pure copper 10.

[0029] It is worth noting that, in order to enhance the sealing of the vacuum working environment, the sealing part 6 of this invention includes a sealing door 61, which is hinged at the opening of the vacuum chamber 2. A compression spring 62 is connected to the front of the sealing door 61, and the sealing door 61 abuts against the furnace door of the vacuum diffusion welding furnace 1 through the compression spring 62. A heat radiation pipe 63 is installed on the back of the sealing door 61.

[0030] To further automate the diffusion welding operation, a control panel 11 is installed on the outer wall of the furnace door of the vacuum diffusion welding furnace 1 in this case. The control panel 11 is electrically connected to the vacuum valve 32, the inert gas valve 33, four electric push rods 41, the Hall sensor 46, two electromagnetic coils 47 and two electrodes 51.

[0031] The working principle involves placing the molybdenum body 9 and the titanium alloy body 8 on the worktable 34 inside the vacuum chamber 2, with two pure copper 10 layers in between. The guide plates 52 on the two electrodes 51 are slidably attached to one side of the two pure copper 10 layers. Through the sliding attachment of the guide plates 52, when a discharge occurs, the instantaneously changing current generates a strong magnetic field. According to Lenz's law, the magnetic field generated by the discharge change inside the vacuum chamber 2 will oppose the magnetic field generated by the electromagnetic coil 47 and the samarium cobalt permanent magnet 44. Utilizing this characteristic, the electrodes 51 can be pushed to slide and spring away, allowing the electrodes 51 to quickly separate from the pure copper 10, avoiding damage to the equipment and materials caused by continuous discharge, and improving safety.

[0032] After the material is loaded, the sealing door 61 is closed. After the door of the vacuum diffusion welding furnace 1 is closed, the sealing door 61 is continuously pressed by the compression spring 62 to prevent the high-temperature expansion gas inside the vacuum chamber 2 from creating a closed gap. The vacuum valve 32 is controlled to evacuate to a suitable vacuum level. The inner rod of the electric push rod 41 pushes the support arm 42 down, which drives the annular track 43 down to a suitable height. Then, the power supply of the electrode 51 is turned on to heat the intermediate layer of the two pure copper 10 pieces respectively. According to the thermal conductivity and specific heat capacity of the molybdenum body 9 and the titanium alloy body 8, the heating temperature of the pure copper 10 is adjusted to heat the contact surface of the molybdenum body 9 and the titanium alloy body 8 more efficiently, so that the heating rate of the two materials tends to be uniform and balanced. In conjunction with turning on the heat radiation pipe 63 to heat the molybdenum body 9 and the titanium alloy body 8, the atomic diffusion is promoted. The mutual diffusion between copper atoms and molybdenum and titanium atoms is more complete, which helps to form a more stable and uniform transition layer between molybdenum and titanium alloy, reduce the composition and structure inhomogeneity at the weld joint, and improve the mechanical properties of the weld joint.

[0033] The heat generated by the current enhances atomic diffusion at the interface between the pure copper 10 intermediate layer and the molybdenum and titanium alloy, promoting the mutual penetration and fusion of elements. This helps to eliminate tiny gaps and defects at the interface, making the welded interface more tightly bonded together. Good interface bonding can effectively transfer loads, improve the load-bearing capacity of the welded joint, reduce the risk of cracking and debonding during use, and improve the reliability and service life of the welded structure. When current is applied to the pure copper 10 intermediate layer, a magnetic field will be generated around it according to Ampere's law. In the vacuum cavity 2, this magnetic field will interact with the magnetic field generated by the externally set electromagnetic coil 47 and the magnetic field formed by the samarium cobalt permanent magnet 44. The superposition and interaction of the magnetic fields can affect the trajectory of the current electrons between the electrode 51 and the pure copper 10, causing them to form a spiral motion and suppressing partial discharge and electron accumulation phenomena.

[0034] The electromagnetic coils 47 on both sides generate magnetic fields. The superposition effect of the two symmetrical magnetic fields directly determines the force on the permanent magnet. When the magnetic fields are symmetrical and the direction and intensity distribution are reasonable, the resultant force on the samarium cobalt permanent magnet 44 is stable, and it can make a smooth circular motion along the circular track 43, ensuring the stability of the magnetic field distribution, suppressing partial discharge and electron accumulation between the electrode 51 and the pure copper 10, and providing a stable magnetic field environment for the welding process. The Hall sensor 46 moves with the samarium cobalt permanent magnet 44, captures the change data of the magnetic field affected by the high temperature in the high temperature environment and feeds it back to the controller. The controller automatically adjusts the current, voltage and power of the power supply of the compensation electromagnetic coil 47 according to the feedback data to further ensure the stability of the magnetic field.

[0035] Inert gas valve 33 can inject inert gas to further displace residual oxygen in the cavity, forming an inert gas protective atmosphere around the weldment. This effectively isolates molybdenum from contact with the titanium alloy and oxygen, preventing the material surface from being oxidized during the high-temperature diffusion welding process. It also avoids the presence of an oxide layer that hinders atomic diffusion, ensuring the quality and performance of the weld joint. Furthermore, it improves heat transfer. When inert gas molecules interact with electrons and ions generated by the discharge, they can absorb energy, reduce the intensity and frequency of the discharge, and minimize the interference of partial discharge on the welding process, ensuring the smooth progress of the welding process.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A diffusion-welded structure of molybdenum and titanium alloy, characterized in that, include: Vacuum diffusion welding furnace (1); A vacuum chamber (2) is installed inside the furnace cavity of the vacuum diffusion welding furnace (1); Mounting part (3) is provided on the vacuum chamber (2) for mounting diffusion welding tools; A magnetic field compensation unit (4) is installed on the vacuum cavity (2) to stabilize the magnetic field distribution and suppress partial discharge and electron accumulation; A heat compensation unit (5) is installed on the mounting unit (3) to balance the heating efficiency of the contact surface between molybdenum and titanium alloy; A sealing part (6) is installed at the opening of the vacuum chamber (2) to seal the vacuum chamber (2) and provide thermal radiation.

2. The diffusion-welded structure of molybdenum and titanium alloy according to claim 1, characterized in that: The mounting part (3) includes a shaft hole (31), which is located in the middle of the top of the vacuum chamber (2). A vacuum valve (32) is provided on one side of the top of the vacuum chamber (2), and an inert gas valve (33) is provided on the other side of the top of the vacuum chamber (2). A worktable (34) is installed in the center of the bottom of the inner wall of the vacuum chamber (2). Rod holes (35) are provided at the four corners of the top of the vacuum chamber (2). Two insulating holes (36) are provided on the back of the vacuum chamber (2).

3. The diffusion-welded structure of molybdenum and titanium alloy according to claim 2, characterized in that: A hydraulic cylinder (7) is installed on the inner wall of the shaft hole (31), a titanium alloy body (8) is provided on the top of the worktable (34), a molybdenum body (9) is provided above the titanium alloy body (8), and pure copper (10) is provided between the titanium alloy body (8) and the molybdenum body (9).

4. The diffusion-welded structure of molybdenum and titanium alloy according to claim 3, characterized in that: The magnetic field compensation unit (4) includes four electric push rods (41), which are respectively installed at the top four corners of the vacuum chamber (2). The inner rods of the four electric push rods (41) slide through the inner walls of the four rod holes (35). The ends of the inner rods of the four electric push rods (41) are fixedly connected to support arms (42). The four support arms (42) are respectively slidably connected to the four corners of the inner wall of the vacuum chamber (2). A ring track (43) is fixedly connected between the four support arms (42). A samarium cobalt permanent magnet (44) is slidably connected in the track groove of the ring track (43). Two electromagnetic coils (47) are symmetrically installed in the furnace cavity of the vacuum diffusion welding furnace (1).

5. The diffusion welded structure of molybdenum and titanium alloy according to claim 4, characterized in that: The two electromagnetic coils (47) are located on the outer walls of the vacuum cavity (2) respectively. A clamping plate (45) is fixedly connected to the samarium cobalt permanent magnet (44). A Hall sensor (46) is clamped on the clamping plate (45). The Hall sensor (46) is electrically connected to the two electromagnetic coils (47).

6. The diffusion-welded structure of molybdenum and titanium alloy according to claim 5, characterized in that: The thermal compensation part (5) includes an electrode (51), one end of which has a sliding hole, and a guide plate (52) is slidably connected to the inner wall of the sliding hole.

7. The diffusion welded structure of molybdenum and titanium alloy according to claim 6, characterized in that: There are two thermal compensation parts (5). The two electrodes (51) of the two thermal compensation parts (5) are fixedly inserted through two insulating holes (36) at the ends away from the guide plate (52). The two insulating holes (36) are staggered vertically.

8. The diffusion-welded structure of molybdenum and titanium alloy according to claim 7, characterized in that: There are two pure copper (10) pieces. The two pure copper (10) pieces are respectively attached to the titanium alloy body (8) and the molybdenum body (9). The two pure copper (10) pieces are attached to each other. The two pure copper (10) pieces are aligned with each other with the titanium alloy body (8) and the molybdenum body (9). The guide plate (52) on one of the electrodes (51) is attached to one side of the pure copper (10), and the guide plate (52) on the other electrode (51) is attached to one side of the other pure copper (10).

9. The diffusion-welded structure of molybdenum and titanium alloy according to claim 8, characterized in that: The sealing part (6) includes a sealing door (61), which is hinged to the opening of the vacuum chamber (2). A compression spring (62) is connected to the front of the sealing door (61), and the sealing door (61) abuts against the furnace door of the vacuum diffusion welding furnace (1) through the compression spring (62). A heat radiation pipe (63) is installed on the back of the sealing door (61).

10. The diffusion-welded structure of molybdenum and titanium alloy according to claim 9, characterized in that: The vacuum diffusion welding furnace (1) has a control panel (11) installed on the outer wall of the furnace door. The control panel (11) is electrically connected to the vacuum valve (32), the inert gas valve (33), four electric push rods (41), the Hall sensor (46), two electromagnetic coils (47) and two electrodes (51).

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