Bimetal diffusion welding method and device for copper alloy steel

Abstract

The invention discloses a double-metal diffusion welding method and device for copper alloy steel, and relates to the technical field of metal material welding, and the technical scheme is characterized by comprising the following steps: step 1, forming: taking copper alloy and steel, and carrying out cutting processing to obtain processed and formed copper alloy and processed and formed steel with corresponding sizes for later use; step 2, cleaning: carrying out ultrasonic cleaning on the surfaces of the processed and formed copper alloy and the processed and formed steel to obtain the clean processed and formed copper alloy and the processed and formed steel; 3, compounding is conducted, specifically, the machined and formed copper alloy and the machined and formed steel are tightly attached, pressure facing the attaching face is applied, and pre-compounded metal is obtained; and 4, welding is conducted, specifically, the pre-composite metal sequentially passes through a preheating zone to be subjected to preheating treatment, then passes through a diffusion welding zone to be subjected to diffusion welding treatment and finally passes through a 4000 mm refractory material afterheat tempering zone to be discharged out of a furnace, the discharging temperature is lower than 400 DEG C, and the composite metal material is obtained. The method has the effect of continuously producing the high-strength composite metal materials in batches.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material welding, and more specifically, it relates to a bimetal diffusion welding method and device for copper alloy steel. Background Art

[0002] Bimetal welding technology belongs to advanced welding processes. Currently, it mainly involves connecting and combining two different metal materials to achieve a high-strength, wear-resistant, and corrosion-resistant composite structure through melting, metallurgical bonding, or mechanical interlocking. Therefore, bimetal welding technology has been widely applied in aerospace, oil pipelines, automobile manufacturing, and the processing of high-precision tools. Among them, copper alloy and steel are two metal materials widely used in the industrial field. Due to the excellent wear resistance, electrical conductivity, thermal conductivity, and corrosion resistance of copper alloy, while steel has high strength, high hardness, and good mechanical properties. Therefore, combining copper alloy and steel using bimetal welding technology and applying it to the flow surfaces of hydraulic pumps, hydraulic motor cylinders, etc. has become the current mainstream choice to achieve the combination of the advantages of copper alloy and steel.

[0003] However, since the combination of existing copper alloy and steel mainly uses brazing or fusion welding processes, and due to the large differences in the physical and chemical properties of copper alloy and steel, such as differences in melting point, thermal expansion coefficient, and oxygen-binding ability, etc., the composite materials of copper alloy and steel prepared by existing welding processes have problems such as interfacial brittle phases and large thermal deformations, making it difficult to achieve high-quality and high-strength bimetal welding of copper alloy and steel, and it is extremely easy to produce problems such as cracks, pores, and insufficient bonding strength. At the same time, traditional diffusion welding requires a vacuum environment, with high equipment costs and unable to produce continuously, which seriously affects production efficiency while making it difficult to obtain high-strength composite metal materials and needs to be improved. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the first object of the present invention is to provide a bimetal diffusion welding method for copper alloy steel, which has the effect of continuously mass-producing high-strength composite metal materials.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bimetal diffusion welding method for copper alloy steel includes the following steps:

[0007] Step 1, forming: Take copper alloy and steel, and obtain processed and formed copper alloy and processed and formed steel with corresponding dimensions through cutting processing for later use;

[0008] Step 2, cleaning: Ultrasonically clean the surfaces of the processed and formed copper alloy and processed and formed steel to obtain clean processed and formed copper alloy and processed and formed steel;

[0009] Step 3, Compounding: Press the processed and formed copper alloy and the processed and formed steel tightly against each other and apply a pressure towards the contacting surface to obtain a pre-compounded metal;

[0010] Step 4, Welding: Preheat the pre-compounded metal successively through a preheating zone at 800 - 900 °C, then perform diffusion welding treatment through a diffusion welding zone at 900 - 1000 °C, and finally take it out through a refractory material post-weld tempering zone of 4000 mm, and control the temperature of the post-weld tempering zone to be lower than 400 °C and the taking-out temperature to be lower than 400 °C to obtain a composite metal material.

[0011] Preferably: In Step 2, the ultrasonic cleaning is carried out using a cleaning liquid, and the cleaning liquid includes borax with a mass percentage of 1.1 - 1.6%, boric acid with a mass percentage of 2.0 - 2.4%, activated carbon fiber with a mass percentage of 2.1 - 4.2%, ferric citrate with a mass percentage of 0.2 - 0.6%, and the balance being water.

[0012] Preferably: The activation of the activated carbon fiber includes Step ① preparing an acid and the carbon fiber to be activated; Step ② preparing a concentrated nitric acid with a mass concentration of 70%; Step ③ dispersing the carbon fiber in the concentrated nitric acid, controlling the temperature of the concentrated nitric acid to be 60 °C, taking it out after shaking for 2 - 4 h; Step ④ cleaning with clear water and drying to obtain the activated carbon fiber.

[0013] Preferably: In Step 1, the surface roughness of the processed and formed copper alloy and the processed and formed steel is less than 0.8 μm.

[0014] Preferably: In Step 4, the preheating treatment time is 30 - 60 min, and the diffusion welding treatment time is 2 - 3 h.

[0015] Preferably: The interfacial bonding strength of the composite metal material is greater than 300 MPa.

[0016] The second object of the present invention is to provide a bimetallic diffusion welding device for copper alloy steel, including a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine, and a continuous mesh belt furnace; wherein, the polishing machine is used to polish and remove oxidation from the surfaces of the processed and formed copper alloy and the processed and formed steel; the ultrasonic cleaning machine is used to clean the processed and formed copper alloy and the processed and formed steel treated by the polishing machine in a cleaning liquid at a temperature above 70 °C; the constant pressure locking machine is used to compound, pressurize, and fix the processed and formed copper alloy and the processed and formed steel cleaned by the ultrasonic cleaning machine to form a pre-compounded metal; the continuous mesh belt furnace is used to supply the pre-compounded metal to pass successively through a preheating zone, a diffusion welding zone, and a post-weld tempering zone to obtain a composite metal material treated by diffusion welding.

[0017] Preferably, the temperature of the preheating zone is 800 - 900 °C; the temperature of the diffusion welding zone is 900 - 1000 °C; the temperature of the post-welding tempering zone is 360 - 398 °C.

[0018] The third object of the present invention is to provide a bimetal diffusion welding device for copper alloy steel, including a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine and an electric furnace; wherein, the polishing machine is used to polish and remove oxidation on the surfaces of the processed copper alloy and the processed steel; the ultrasonic cleaning machine is used to clean the processed copper alloy and the processed steel treated by the polishing machine in a cleaning liquid with a temperature above 70 °C; the constant pressure locking machine is used to compound and press-fix the processed copper alloy and the processed steel cleaned by the ultrasonic cleaning machine to form a pre-compound metal; the electric furnace is used to supply the pre-compound metal to pass through the preheating zone, the diffusion welding zone and the post-welding tempering zone in sequence to obtain a compound metal material treated by diffusion welding.

[0019] The temperature of the preheating zone is 800 - 900 °C; the temperature of the diffusion welding zone is 900 - 1000 °C; the temperature of the post-welding tempering zone is 200 - 398 °C.

[0020] From the above solutions, it can be seen that the present application provides a bimetal diffusion welding method and device for copper alloy steel. The bimetal diffusion welding of copper alloy steel has the following beneficial effects: continuously and batch producing complex geometric-shaped compound metal materials through a continuous mesh belt furnace, and making the interfacial bonding strength of the compound metal material greater than 300 MPa; among them, a cleaning liquid containing borax, boric acid, activated carbon fiber and ferric citrate is used to form an oxide film on the contact interface of the processed copper alloy and the processed steel to prevent oxidation, while reducing the difficulty of metal atoms during the diffusion process, and due to the activated carbon fiber enhancing the interfacial bonding strength, the iron ions reduce the stress difference between the processed copper alloy and the processed steel, thereby significantly enhancing the interfacial bonding strength of the compound metal material. Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of this embodiment.

[0022] Description of the reference numerals: 1. Polishing machine; 2. Ultrasonic cleaning machine; 3. Constant pressure locking machine; 4. Continuous mesh belt furnace. Detailed Embodiments

[0023] To make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0024] A bimetal diffusion welding method for copper alloy steel, comprising the following steps:

[0025] Step 1, forming: Take copper alloy and steel, and obtain the processed and formed copper alloy and processed and formed steel with corresponding dimensions by cutting, and control the surface roughness of the processed and formed copper alloy and processed and formed steel to be less than 0.8 μm.

[0026] Step 2, cleaning: Ultrasonically clean the surfaces of the processed and formed copper alloy and processed and formed steel to obtain clean processed and formed copper alloy and processed and formed steel; wherein, ultrasonic cleaning is carried out using a cleaning solution. The cleaning solution includes 1.1 - 1.6% by mass of borax, 2.0 - 2.4% of boric acid, 2.1 - 4.2% of activated carbon fiber, 0.2 - 0.6% of ferric citrate, and the balance of water.

[0027] Step 3, compounding: Press the processed and formed copper alloy and processed and formed steel tightly and apply a pressure towards the tight contact surface to obtain a pre-compounded metal.

[0028] Step 4, welding: Preheat the pre-compounded metal successively through a preheating zone at 800 - 900 °C, then perform diffusion welding treatment through a diffusion welding zone at 900 - 1000 °C, and finally take it out through a refractory material afterheat tempering zone of 4000 mm, and control the temperature of the afterheat tempering zone to be lower than 400 °C, and the out-of-furnace temperature to be lower than 400 °C to obtain a compound metal material.

[0029] It should be noted that the activation of the activated carbon fiber includes step ① preparing an acid and the carbon fiber to be activated; step ② preparing a concentrated nitric acid with a mass concentration of 70%; step ③ dispersing the carbon fiber in the concentrated nitric acid, controlling the temperature of the concentrated nitric acid to be 60 °C, taking it out after shaking for 2 - 4 h; step ④ washing with clean water and drying to obtain the activated carbon fiber.

[0030] In the embodiment of the present application, the preheating treatment time is 30 - 60 min, and the diffusion welding treatment time is 2 - 3 h. And the interfacial bonding strength of the compound metal material is greater than 300 MPa.

[0031] Such as Figure 1As shown in the figure, a bimetal diffusion welding device for copper alloy steel includes a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine, and a continuous mesh belt furnace. Among them, the polishing machine is used to polish and remove oxidation on the surfaces of the processed copper alloy and the processed steel. The ultrasonic cleaning machine is used to clean the processed copper alloy and the processed steel treated by the polishing machine in a cleaning liquid with a temperature above 70°C. The constant pressure locking machine is used to compound and press-fix the processed copper alloy and the processed steel cleaned by the ultrasonic cleaning machine to form a pre-compounded metal. The continuous mesh belt furnace is used to supply the pre-compounded metal to pass through the preheating zone, the diffusion welding zone, and the afterheat tempering zone in sequence, control the temperature of the preheating zone to be 800 - 900°C, the temperature of the diffusion welding zone to be 900 - 1000°C, and the temperature of the afterheat tempering zone to be 360 - 398°C, and obtain a composite metal material processed by diffusion welding.

[0032] It should be mentioned that the running speed of the continuous mesh belt furnace can be adaptively adjusted according to the differences in thickness, weight, and structure caused by the specifications of the processed copper alloy and the processed steel, and the parameters and network speed can be adaptively adjusted in view of the differences in heat absorption and conduction efficiency of the corresponding composite metal material products, which will not be elaborated here.

[0033] Example 1

[0034] A bimetal diffusion welding method for copper alloy steel includes the following steps:

[0035] Step 1, forming: Take copper alloy and steel, and obtain the processed copper alloy and the processed steel with corresponding dimensions by cutting processing for use, and control the surface roughness of the processed copper alloy and the processed steel to be less than 0.8μm.

[0036] Step 2, cleaning: Ultrasonically clean the surfaces of the processed copper alloy and the processed steel to obtain clean processed copper alloy and processed steel; among them, ultrasonic cleaning is carried out using a cleaning liquid. The cleaning liquid includes 1.1% borax, 2.0% boric acid, 2.1% activated carbon fiber, 0.2% ferric citrate, and the balance is water by mass percentage.

[0037] Step 3, compounding: Press the processed copper alloy and the processed steel closely and apply pressure towards the close surface to obtain a pre-compounded metal.

[0038] Step 4, welding: Pass the pre-compounded metal through a preheating zone at 800°C for preheating treatment, then through a diffusion welding zone at 900°C for diffusion welding treatment, and finally out of the furnace through a refractory afterheat tempering zone of 4000mm, and control the temperature of the afterheat tempering zone to be lower than 400°C, and the out-of-furnace temperature to be lower than 400°C to obtain a composite metal material.

[0039] It should be noted that the activation of activated carbon fiber includes step ① preparing acid and carbon fiber to be activated; step ② preparing concentrated nitric acid with a mass concentration of 70%; step ③ dispersing the carbon fiber in the concentrated nitric acid, controlling the temperature of the concentrated nitric acid at 60°C, taking it out after shaking for 4 hours; step ④ washing with clean water and drying to obtain activated carbon fiber.

[0040] In the embodiment of the present application, the preheating treatment time is 30 minutes, and the diffusion welding treatment time is 2 hours. And the interfacial bonding strength of the composite metal material is greater than 300 MPa.

[0041] As Figure 1 shown, a bimetallic diffusion welding device for copper alloy steel includes a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine and a continuous mesh belt furnace. Among them, the polishing machine is used to polish the surfaces of the processed copper alloy and the processed steel to remove oxidation. The ultrasonic cleaning machine is used to clean the processed copper alloy and the processed steel treated by the polishing machine in a cleaning liquid with a temperature above 70°C. The constant pressure locking machine is used to compound and press-fix the processed copper alloy and the processed steel cleaned by the ultrasonic cleaning machine to form a pre-composite metal. The continuous mesh belt furnace is used to supply the pre-composite metal to pass through the preheating zone, the diffusion welding zone and the post-welding tempering zone in sequence, controlling the temperature of the preheating zone at 800°C, the temperature of the diffusion welding zone at 900°C, and the temperature of the post-welding tempering zone at 360°C, and obtaining a composite metal material after diffusion welding treatment. After testing, the interfacial bonding strength of the composite metal material in Embodiment 1 of the present application is 386 MPa.

[0042] Embodiment 2

[0043] A bimetallic diffusion welding method for copper alloy steel includes the following steps:

[0044] Step 1, forming: taking copper alloy and steel, obtaining processed copper alloy and processed steel with corresponding dimensions by cutting processing for use, and controlling the surface roughness of the processed copper alloy and the processed steel to be less than 0.8 μm.

[0045] Step 2, cleaning: ultrasonically cleaning the surfaces of the processed copper alloy and the processed steel to obtain clean processed copper alloy and processed steel; among them, ultrasonic cleaning is carried out with a cleaning liquid. The cleaning liquid includes 1.3% borax, 2.2% boric acid, 3.5% activated carbon fiber, 0.4% ferric citrate and the balance of water by mass percentage.

[0046] Step 3, compounding: closely attaching the processed copper alloy and the processed steel and applying pressure towards the attaching surface to obtain a pre-composite metal.

[0047] Step 4, Welding: The pre-composite metal is preheated by passing through a preheating zone at 830 °C in sequence, then undergoes diffusion welding treatment through a diffusion welding zone at 930 °C, and finally is taken out through a refractory material afterheat tempering zone of 4000 mm. The temperature of the afterheat tempering zone is controlled to be lower than 400 °C, and the out-of-furnace temperature is lower than 400 °C to obtain a composite metal material.

[0048] It should be noted that the activation of activated carbon fiber includes Step ① preparing an acid and carbon fiber to be activated; Step ② preparing to obtain concentrated nitric acid with a mass concentration of 70%; Step ③ dispersing the carbon fiber in the concentrated nitric acid, controlling the temperature of the concentrated nitric acid to be 60 °C, taking it out after shaking for 3 h; Step ④ washing with clear water and drying to obtain activated carbon fiber.

[0049] In the embodiment of the present application, the preheating treatment time is 45 min, and the diffusion welding treatment time is 2.5 h. And the interfacial bonding strength of the composite metal material is greater than 300 MPa.

[0050] As Figure 1 shown, a bimetal diffusion welding device for copper alloy steel includes a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine, and a continuous mesh belt furnace. Among them, the polishing machine is used to polish and remove oxidation on the surfaces of the processed copper alloy and the processed steel. The ultrasonic cleaning machine is used to clean the processed copper alloy and the processed steel treated by the polishing machine in a cleaning liquid with a temperature above 70 °C. The constant pressure locking machine is used to compound and press-fix the processed copper alloy and the processed steel cleaned by the ultrasonic cleaning machine to form a pre-composite metal. The continuous mesh belt furnace is used to supply the pre-composite metal to pass through the preheating zone, the diffusion welding zone, and the afterheat tempering zone in sequence, control the temperature of the preheating zone to be 830 °C, the temperature of the diffusion welding zone to be 930 °C, and the temperature of the afterheat tempering zone to be 378 °C, and obtain a composite metal material after diffusion welding treatment. After testing, the interfacial bonding strength of the composite metal material in the second embodiment of the present application is 401 MPa.

[0051] Example Three

[0052] A bimetal diffusion welding method for copper alloy steel includes the following steps:

[0053] Step 1, Shaping: Take copper alloy and steel, and obtain processed copper alloy and processed steel with corresponding dimensions by cutting processing for use, and control the surface roughness of the processed copper alloy and the processed steel to be less than 0.8 μm.

[0054] Step 2, Cleaning: Ultrasonically clean the surfaces of the processed copper alloy and the processed steel to obtain clean processed copper alloy and processed steel; among them, ultrasonic cleaning is carried out using a cleaning liquid. The cleaning liquid includes 1.6% borax, 2.4% boric acid, 4.2% activated carbon fiber, 0.6% ferric citrate, and the balance is water by mass percentage.

[0055] Step 3, Compounding: Press the formed copper alloy and the formed steel tightly together and apply pressure towards the tight contact surface to obtain a pre-compounded metal.

[0056] Step 4, Welding: Pass the pre-compounded metal through a preheating zone at 900 °C for preheating treatment, then through a diffusion welding zone at 1000 °C for diffusion welding treatment, and finally exit through a refractory material afterheat tempering zone of 4000 mm. Control the temperature of the afterheat tempering zone to be lower than 400 °C, and the exit temperature to be lower than 400 °C to obtain a composite metal material.

[0057] It should be noted that the activation of activated carbon fiber includes Step ① preparing an acid and the carbon fiber to be activated; Step ② preparing to obtain concentrated nitric acid with a mass concentration of 70%; Step ③ dispersing the carbon fiber in the concentrated nitric acid, controlling the temperature of the concentrated nitric acid to be 60 °C, taking it out after shaking for 2 h; Step ④ washing with clean water and drying to obtain activated carbon fiber.

[0058] In the embodiment of the present application, the preheating treatment time is 60 min, and the diffusion welding treatment time is 2 - 3 h. And the interfacial bonding strength of the composite metal material is greater than 300 MPa.

[0059] As Figure 1 shown, a bimetal diffusion welding device for copper alloy steel includes a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine, and a continuous mesh belt furnace. Among them, the polishing machine is used to polish and remove oxidation on the surfaces of the formed copper alloy and the formed steel. The ultrasonic cleaning machine is used to clean the formed copper alloy and the formed steel processed by the polishing machine in a cleaning liquid with a temperature above 70 °C. The constant pressure locking machine is used to compound, pressurize, and fix the formed copper alloy and the formed steel cleaned by the ultrasonic cleaning machine to form a pre-compounded metal. The continuous mesh belt furnace is used to supply the pre-compounded metal to pass through the preheating zone, the diffusion welding zone, and the afterheat tempering zone in sequence, control the temperature of the preheating zone to be 850 °C, the temperature of the diffusion welding zone to be 950 °C, and the temperature of the afterheat tempering zone to be 398 °C, and obtain a composite metal material after diffusion welding treatment. After testing, the interfacial bonding strength of the composite metal material in Embodiment 3 of the present application is 396 MPa.

[0060] Example 4

[0061] The difference between Example 4 and Example 3 is that the bimetal diffusion welding device for copper alloy steel in Example 4 includes a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine, and an electric furnace; among them, the polishing machine is used to polish the surfaces of the processed copper alloy and the processed steel to remove oxidation. The ultrasonic cleaning machine is used to clean the processed copper alloy and the processed steel treated by the polishing machine in a cleaning liquid at a temperature above 70°C. The constant pressure locking machine is used to compound and press-fix the processed copper alloy and the processed steel cleaned by the ultrasonic cleaning machine to form a pre-compounded metal. The continuous mesh belt furnace is used to supply the pre-compounded metal to pass through the preheating zone, the diffusion welding zone, and the afterheat tempering zone in sequence, controlling the temperature of the preheating zone to be 850°C, the temperature of the diffusion welding zone to be 950°C, and the temperature of the afterheat tempering zone to be 200°C. And a composite metal material treated by diffusion welding is obtained. After testing, the interfacial bonding strength of the composite metal material in Example 4 of this application is 382 MPa.

[0062] Example 5

[0063] The difference between Example 5 and Example 4 is that the temperature of the afterheat tempering zone in Example 5 is 300°C. After testing, the interfacial bonding strength of the composite metal material in Example 5 of this application is 387 MPa.

[0064] Comparative Example 1

[0065] The difference between Comparative Example 1 and Example 2 is that the cleaning liquid in Comparative Example 1 is clean water. After testing, the interfacial bonding strength of the composite metal material in Comparative Example 1 of this application is 343 MPa.

[0066] Comparative Example 2

[0067] The difference between Comparative Example 2 and Example 2 is that the cleaning liquid in Comparative Example 2 does not add activated carbon fiber. After testing, the interfacial bonding strength of the composite metal material in Comparative Example 1 of this application is 378 MPa.

[0068] In summary, this application provides a bimetal diffusion welding method and device for copper alloy steel. The bimetal diffusion welding of copper alloy steel has the following beneficial effects: continuously and batch producing composite metal materials with complex geometric shapes through a continuous mesh belt furnace, and making the interfacial bonding strength of the composite metal material greater than 300 MPa; among them, a cleaning liquid containing borax, boric acid, activated carbon fiber, and ferric citrate is used to form an oxide film on the contact interface between the processed copper alloy and the processed steel to prevent oxidation, while reducing the difficulty of metal atoms during the diffusion process, and due to the activated carbon fiber enhancing the interfacial bonding strength, the iron ions can reduce the stress difference between the processed copper alloy and the processed steel, thereby significantly enhancing the interfacial bonding strength of the composite metal material.

[0069] The "first", "second", "third", "fourth", etc. (if any) involved in this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods or devices.

[0070] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0071] Specific examples are used herein to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only for helping to understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, based on the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A bimetallic diffusion welding method for copper alloy steel, characterized in that, It includes the following steps: Step 1, forming: Take copper alloy and steel, and obtain processed and formed copper alloy and processed and formed steel with corresponding dimensions through cutting processing for standby; Step 2, cleaning: Ultrasonically clean the surfaces of the processed and formed copper alloy and the processed and formed steel to obtain clean processed and formed copper alloy and processed and formed steel; Step 3, compounding: Press the processed and formed copper alloy and the processed and formed steel closely and apply pressure towards the close surface to obtain pre-compounded metal; Step 4, welding: Pass the pre-compounded metal through a preheating zone at 800 - 900 °C for preheating treatment, then through a diffusion welding zone at 900 - 1000 °C for diffusion welding treatment, and finally take it out through a refractory material afterheat tempering zone of 4000 mm, and control the temperature of the afterheat tempering zone to be lower than 400 °C, and the out-of-furnace temperature to be lower than 400 °C to obtain a composite metal material.

2. The bimetal diffusion welding method of a copper alloy steel according to claim 1, characterized in that: In Step 2, the ultrasonic cleaning is carried out using a cleaning solution, and the cleaning solution includes borax with a mass percentage of 1.1 - 1.6%, boric acid with a mass percentage of 2.0 - 2.4%, activated carbon fiber with a mass percentage of 2.1 - 4.2%, ferric citrate with a mass percentage of 0.2 - 0.6%, and water as the balance.

3. A bimetal diffusion welding method for copper alloy steel according to claim 2, characterized in that: The activation of the activated carbon fiber includes Step ① preparing acid and carbon fiber to be activated; Step ② preparing a concentrated nitric acid with a mass concentration of 70%; Step ③ dispersing the carbon fiber in the concentrated nitric acid, controlling the temperature of the concentrated nitric acid to be 60 °C, taking it out after shaking for 2 - 4 h; Step ④ washing with clean water and drying to obtain activated carbon fiber.

4. A bimetallic diffusion welding method for copper alloy steel according to claim 1, characterized in that: In Step 1, the surface roughness of the processed and formed copper alloy and the processed and formed steel is less than 0.8 μm.

5. A bimetal diffusion welding method for copper alloy steel according to claim 1, characterized in that: In Step 4, the preheating treatment time is 30 - 60 min, and the diffusion welding treatment time is 2 - 3 h.

6. The bimetal diffusion welding method of a copper alloy steel according to claim 1, characterized in that: The interfacial bonding strength of the composite metal material is greater than 300 MPa.

7. A bimetal diffusion welding device for copper alloy steel, characterized in that: It includes a polishing machine, an ultrasonic cleaning machine, a constant pressure locking machine, and a continuous mesh belt furnace; among them, the polishing machine is used to polish and remove oxidation from the surfaces of the processed and formed copper alloy and the processed and formed steel; the ultrasonic cleaning machine is used to clean the processed and formed copper alloy and the processed and formed steel treated by the polishing machine in a cleaning solution at a temperature above 70 °C; the constant pressure locking machine is used to compound, pressurize, and fix the processed and formed copper alloy and the processed and formed steel cleaned by the ultrasonic cleaning machine to form pre-compounded metal; the continuous mesh belt furnace is used to supply the pre-compounded metal to pass through the preheating zone, the diffusion welding zone, and the afterheat tempering zone in sequence to obtain a composite metal material treated by diffusion welding.

8. A bimetallic diffusion welding device for copper alloy steel according to claim 7, characterized in that: The temperature of the preheating zone is 800 - 900 °C; the temperature of the diffusion welding zone is 900 - 1000 °C; the temperature of the afterheat tempering zone is 360 - 398 °C.

9. A bimetallic diffusion welding device for copper alloy steel, characterized in that: It includes a polishing machine, an ultrasonic cleaning machine, a constant-pressure locking machine and an electric furnace; among them, the polishing machine is used to polish and remove oxidation on the surfaces of the processed and formed copper alloy and the processed and formed steel; the ultrasonic cleaning machine is used to clean the processed and formed copper alloy and the processed and formed steel treated by the polishing machine in a cleaning liquid above 70°C; the constant-pressure locking machine is used to compound and press-fix the processed and formed copper alloy and the processed and formed steel cleaned by the ultrasonic cleaning machine to form a pre-compound metal; the electric furnace is used to supply the pre-compound metal to pass through a preheating zone, a diffusion welding zone and a post-welding tempering zone in sequence to obtain a composite metal material treated by diffusion welding.

10. A bimetallic diffusion welding device for copper alloy steel according to claim 9, characterized in that: The temperature of the preheating zone is 800 - 900°C; the temperature of the diffusion welding zone is 900 - 1000°C; the temperature of the post-welding tempering zone is 200 - 398°C.

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