A method and application of preparing an additive body with an interwoven bimetallic interface based on arc additive manufacturing technology

Abstract

The present invention discloses an additive body with an interwoven bimetallic interface prepared based on arc additive manufacturing technology, and its manufacturing method and application, which belong to the field of non-ferrous metal processing technology. The additive body of the present invention is prepared from two different metals, and the additive body is deposited by multiple multi-layer welds. The two different metal bonding interfaces of the additive body present a zigzag or bamboo-shaped shape, and the two materials can be well combined at the interface. The additive body with an interwoven bimetallic interface of the present invention is a new material with good performance formed by combining material A and material B, which expands the application field of the material, has low cost and high efficiency, and is suitable for industrial production. The manufacturing method of the present invention uses two different materials to successfully prepare an additive body with an interwoven bimetallic interface. The present invention adopts interval printing and cooling conditions to make fine grain structure appear between layers and welds, effectively improving the mechanical properties of the additive body.

Description

Technical Field

[0001] The present invention relates to an additive body with an interwoven bimetallic interface prepared based on an arc additive manufacturing technology, a manufacturing method thereof and an application thereof, and belongs to the technical field of non-ferrous metal processing. Background Art

[0002] Arc additive manufacturing (AM) uses an electric arc as a heat source to melt a metal wire, then deposits it layer by layer along a predetermined path onto a metal substrate. Arc AM offers a short cycle time and a high level of automation, enabling digital, intelligent, and flexible manufacturing. It utilizes raw materials efficiently, allowing for the rapid production of parts with complex shapes and structures, while also limiting size restrictions.

[0003] While most arc additive manufacturing research focuses on manufacturing materials of the same type, some specialized applications require the combination of two materials. For example, spacecraft experience extreme high and low temperatures during flight, and there is an urgent need for a material that can provide different thermal properties in different regions to effectively protect the spacecraft. In recent years, researchers have developed various low-temperature manufacturing processes, such as friction welding, diffusion welding, and ultrasonic welding, to join dissimilar metals. However, technologies like friction welding and ultrasonic welding have many drawbacks, such as holes and cracks, and their formability is poor, making it difficult to meet the demands of high-quality, precise forming. Diffusion welding requires a long joining cycle, limiting its application.

[0004] The use of arc additive manufacturing materials to manufacture metal composites is a current research hotspot. The unique flexibility of the present invention in using arc additive manufacturing for spatial design and manufacturing is conducive to combining heterogeneous materials and customized architectures, which can enhance overall performance. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an additive body with an interwoven bimetallic interface prepared based on arc additive manufacturing technology. The additive body enables two materials to be well combined at the interface to form a new material with good performance, expands the application field of the material, has low cost and high efficiency, and is suitable for industrial production.

[0006] At the same time, the present invention provides a manufacturing method for preparing an additive body with an interwoven bimetallic interface based on arc additive manufacturing technology. Through this preparation method, an additive body with an interwoven bimetallic interface can be obtained in the construction direction and the direction perpendicular to the travel of the welding gun (the interface presents a serrated or bamboo-shaped interface), and the two materials can be well combined at the interface. The above-mentioned additive body with an interwoven bimetallic interface is a new material with good performance formed by combining material A and material B, which expands the application field of the material, has low cost and high efficiency, and is suitable for industrial production.

[0007] At the same time, the present invention provides an application of an arc additive manufacturing technology for preparing an additive body with an interwoven bimetallic interface in high and low temperature environments.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A method for preparing an additive body having an interwoven bimetallic interface based on arc additive manufacturing technology comprises the following steps:

[0010] S01, after removing the surface dirt and oxide layer of the substrate, fix it on the workbench, dry the welding wire material A and welding wire material B, and then load them into two cold metal transfer arc additive manufacturing systems respectively;

[0011] S02: After the overall data of the structural part is modeled, it is sliced ​​and sliced ​​using the Yanjiu Robot 3D Printing Software (IungoPNT), the molding trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system;

[0012] S03 uses arc additive manufacturing technology and sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd welds and even welds. A cold metal transition arc additive manufacturing system first prints the odd welds with welding wire material A on the substrate. After printing is completed, it is cooled and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, another cold metal transition arc additive manufacturing system prints the even welds with welding wire material B. After printing is completed, it is cooled again and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, the second layer is printed in a cyclic interval until an additive body with an interwoven bimetallic interface is obtained.

[0013] Preferably, in S01, the substrate is made of Q235 steel plate.

[0014] Preferably, in S03, adjacent deposition layers are rotated 180° and deposited alternately in opposite directions.

[0015] Preferably, in S03, the process parameters of arc additive manufacturing are: welding speed of 6 to 10 mm / s, wire feeding speed of 4 to 8 m / min, welding current of 102 to 167 A, welding voltage of 13.4 to 15.6 V, and interval width between passes of 1.33 to 5.29 mm.

[0016] Preferably, the interval width between passes is determined by the welding speed and the wire feeding speed. First, the parabolic function relationship y=a+cx is used in SolidWorks software. 2 Modeling a single-layer single-pass weld, we get the relationship:

[0017]

[0018] In formula (1), w is the weld width, i.e. the width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter;

[0019] The relative error between the predicted cross-sectional morphology (obtained using SolidWorks software) and the actual cross-sectional morphology was used to obtain the overlap model, which was then mathematically modeled in MATLAB software. The expression for the weld spacing, i.e., the width w between passes, was finally obtained as follows:

[0020]

[0021] Preferably, the temperature measuring device is one of a handheld infrared temperature measuring gun, a thermocouple, and a thermal imager.

[0022] Preferably, pure argon is used as the shielding gas during the printing process, and the shielding gas flow rate is 15 to 20 L / min.

[0023] Preferably, the elongation of welding wire material A and welding wire material B during the deposition process is 10-15 mm; welding wire material A is a nickel-based alloy Inconel 625 with a diameter of 1.0-1.2 mm, and welding wire material B is a stainless steel alloy SS316L with a diameter of 1.0-1.2 mm.

[0024] The manufacturing method of the present invention is used to prepare an additive body with an interwoven bimetallic interface based on arc additive manufacturing technology. The additive body is prepared from two different metals. The additive body is deposited by multiple multi-layer welds, and the interface between the two different metals of the additive body presents a zigzag or bamboo-shaped shape.

[0025] The present invention provides an arc-based additive manufacturing technology for preparing an additive body with an interwoven bimetallic interface for use in high-temperature and low-temperature environments, including applications in spacecraft or nuclear power plants.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] Based on cold metal transfer arc additive manufacturing, this invention proposes a method for producing an additive body with an interwoven bimetallic interface simply by adjusting the printing path (interval printing method) and cooling conditions. This is achieved by alternating two cold metal transfer devices, using two different materials. By changing the printing path and adopting an interval printing method, and by controlling the interlayer temperature, the bulk structure obtained by traditional deposition strategies is modified, resulting in an additive body with an interwoven bimetallic interface in both the build direction and the direction perpendicular to the welding torch's travel.

[0028] The present invention can obtain an additive body with an interwoven bimetallic interface simply by adjusting the printing strategy. Different areas in the additive body correspond to different properties. The two materials are well combined at the interface, the deposition efficiency is high, the equipment is simple, and the manufacturing cycle and manufacturing cost are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of arc additive printing with interwoven bimetallic interface in Example 1;

[0030] Figure 2 This is a cross-sectional image of the arc additive with interwoven bimetallic interface in Example 1;

[0031] Figure 3 This is an X-ray energy spectrum analysis line scan image of the arc additive with interwoven bimetallic interface in Example 1;

[0032] Figure 4 This is an X-ray energy spectrum analysis surface scanning image of the arc additive with interwoven bimetallic interface additive body in Example 1;

[0033] Figure 5 This is a microhardness image of both sides of the interface of the arc additive with interwoven bimetallic interface in Example 1;

[0034] Figure 6 This is an engineering stress-strain picture of the arc-assisted additive with an interwoven bimetallic interface in Example 1;

[0035] Figure 7 This is an SEM image of the interface of the arc additive with an interwoven bimetallic interface in Example 1. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0037] Example 1

[0038] A method for preparing an additive body having an interwoven bimetallic interface based on arc additive manufacturing technology comprises the following steps:

[0039] (1) First, a Q235 substrate (with dimensions of 500 mm × 300 mm × 20 mm (length × width × height)) was placed on the operating table, and the deposition side of the substrate was laser polished. After polishing, it was first cleaned with clean water, then with anhydrous ethanol, then with anhydrous acetone, and finally with clean water to make the surface of the substrate free of oil and other impurities; after drying the welding wire, it was filled into the cold metal transfer arc additive manufacturing system.

[0040] (2) After the overall data modeling of the structural part (i.e., the additive body with an interwoven bimetallic interface to be manufactured) is completed, layered slicing is performed using the Yanjiu Robot 3D Printing Software (IungoPNT), the molding trajectory is planned, and a data file is generated and imported into the arc fuse additive manufacturing system (i.e., the cold metal transfer arc additive manufacturing system). The data modeling and molding trajectory planning in this step are all existing technologies.

[0041] (3) Arc additive manufacturing based on cold metal transition is performed on the Q235 substrate, and the printing path of each layer is set to interval printing (such as Figure 1 and Figure 5 As shown), the specific process is: welding wire material A selects nickel-based alloy Inconel625 with a diameter of 1.2mm, and material B selects stainless steel alloy SS 316L with a diameter of 1.2mm. Figure 1 As shown, the welds are divided into odd-numbered welds and even-numbered welds. The odd-numbered welds are first printed on the substrate with Inconel 625 welding wire, and then cooled to 200°C after printing. The even-numbered welds are then printed with SS316L welding wire, and then cooled to 200°C after printing. Then, the deposition direction is changed by rotating 180°, and the second layer is printed cyclically according to the printing method of the first layer until an additive body with an interwoven bimetallic interface of a certain volume is obtained. The process parameters are as follows: the welding speed is 10 mm / s, the wire feeding speed is 6 m / min, the welding current and welding voltage at this time are 150 A and 14 V respectively, the pure argon shielding gas flow rate is 20 L / min, and pure argon is used as the shielding gas to prevent the deposited layer from being oxidized during the manufacturing process.

[0042] According to formula (2):

[0043]

[0044] The interval width w between calculation passes is 2.39 mm.

[0045] The calculation method is: the wire feeding speed v w The unit is 6m / min, and the wire feeding speed is converted into 6m / min=6000mm / min=100mm / s;

[0046] w=5×1.2×100 / (8×3.14×10)=2.39.

[0047] In this embodiment, after the odd-numbered weld beads and the even-numbered weld beads are printed, they are cooled to 200° C. by air cooling.

[0048] In this embodiment, the widths of the odd-numbered weld beads and the even-numbered weld beads are the same.

[0049] The manufacturing method of this embodiment obtains an additive body with an interwoven bimetallic interface prepared based on arc additive manufacturing technology. The additive body is prepared from two different metals. The additive body is deposited by multiple multi-layer welds. The interface between the two different metals of the additive body presents a zigzag or bamboo-shaped shape.

[0050] The present embodiment uses arc additive manufacturing technology to prepare additive bodies with interwoven bimetallic interfaces for applications in high and low temperature environments, including applications in spacecraft or nuclear power plants.

[0051] After the accumulation is completed, the sample is cut into thin slices with a thickness of about 2 mm along the direction perpendicular to the travel direction of the welding gun using a wire cutting machine, and then polished on sandpaper to observe the interwoven bimetallic interface, such as Figure 2 shown.

[0052] In order to analyze the transition smoothness of the sample composition, a scanning electron microscope equipped with an energy spectrum analyzer was used to analyze the sample. The line scanning direction was from Inconel 625 to SS 316L. The results are shown in the figure below. Figure 3 As shown, the Fe and Ni elemental compositions change smoothly in a step-like manner in the transition zone, and the width of the transition zone is about 120 μm.

[0053] The surface scanning results are as follows Figure 4 As shown in the figure, it can be observed that Ni is significantly enriched on the Inconel 625 side, and then significantly reduced on the SS 316L side near the interface, with obvious stratification.

[0054] The hardness values ​​measured at different positions of the interwoven bimetallic interface additive body in this embodiment are as follows Figure 5 As shown in the figure, it can be seen that the hardness values ​​on both sides of the interface are significantly different and change in a gradient. The average hardness of SS 316L on the left is 201HV, and the average hardness of Inconel 625 on the right is 227HV.

[0055] Figure 6 The tensile stress-strain graph of the additive body with interwoven bimetallic interface in this embodiment is shown. It can be seen that the performance of IN 625-SS 316L is between that of the raw materials IN 625 and SS 316L, indicating that a new material with good performance can be created using this technology.

[0056] Figure 7Scanning electron microscope images show the absence of cracks or holes at the interface between the two materials in this example. The deposition process involves alternating 180° rotations between layers to improve the quality of the deposited thin-walled structure and reduce porosity. The calculation method for the interval width w between passes ensures scientific and rational weld filling. The weld interface is free of cracks or holes after filling, demonstrating excellent bonding performance.

[0057] In some special applications, such as nuclear power plants and aerospace vehicles, the components involved require different performance in different positions. However, it is almost impossible to achieve this using the characteristics of a single material. Bimetallic material is a new type of composite material. By combining two different materials, the obtained parts or parts thereof have different performance in one or more dimensions. The present invention adopts a method of suitable printing parameters and reasonable planning of printing paths based on arc additive manufacturing. By fusing two different metals, an additive body with an interwoven bimetallic interface is successfully prepared on a Q235 substrate. The additive body with an interwoven bimetallic interface prepared by the present invention has different properties in different areas, and the interface is well bonded, which can expand the application field of the material. It has high practical value and economic benefits and is suitable for industrial production.

[0058] The present invention adopts interval printing and cooling conditions mainly to make fine grain structure appear between layers and welds, thereby effectively improving the mechanical properties of the additive body.

[0059] The present invention proposes a method for preparing an interwoven bimetallic interface based on arc additive manufacturing technology. By using two different materials, appropriate printing parameters and a reasonable printing path, an additive body with an interwoven bimetallic interface is successfully prepared. This not only expands the application field of the material and achieves the effect of 1+1>2, but also the method is efficient and low-cost, making it suitable for industrial production.

[0060] Example 2

[0061] A method for preparing an additive body having an interwoven bimetallic interface based on arc additive manufacturing technology comprises the following steps:

[0062] S01: After removing the surface dirt and oxide layer of the Q235 substrate, fix it on the workbench, dry the welding wire materials A and B, and then load them into two cold metal transfer arc additive manufacturing systems respectively;

[0063] S02: After the overall data of the structural part is modeled, it is sliced ​​and sliced ​​using the Yanjiu Robot 3D Printing Software (IungoPNT), the molding trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system;

[0064] S03 uses arc additive manufacturing technology and sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd welds and even welds. A cold metal transition arc additive manufacturing system first prints the odd welds with welding wire material A on the substrate. After printing is completed, it is cooled and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, another cold metal transition arc additive manufacturing system prints the even welds with welding wire material B. After printing is completed, it is cooled again and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, the second layer is printed in a cyclic interval until an additive body with an interwoven bimetallic interface is obtained.

[0065] In S03, adjacent deposition layers are rotated 180° and deposited in opposite directions alternately.

[0066] In S03, the process parameters of arc additive manufacturing are as follows: welding speed of 6 mm / s, wire feeding speed of 4 m / min, welding current of 102 A, welding voltage of 13.4 V, and pure argon shielding gas flow rate of 15 L / min.

[0067] The interval width between passes is determined by the welding speed and wire feeding speed. First, the parabolic function relationship y=a+cx is used in SolidWorks software. 2 Modeling a single-layer single-pass weld, we get the relationship:

[0068]

[0069] In formula (1), w is the weld width, i.e. the width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter;

[0070] The relative error between the predicted cross-sectional morphology and the actual cross-sectional morphology was used to obtain the overlapping model, and then mathematical modeling was performed in MATLAB software. Finally, the expression of the weld spacing, that is, the interval width w between passes, was obtained as follows:

[0071]

[0072] According to formula (2), the interval width w between passes is calculated to be 2.67 mm.

[0073] The calculation method is: the wire feeding speed v w The unit is 4m / min, which is converted to wire feeding speed 4m / min=4000mm / min=67mm / s;

[0074] w=5×1.2×67 / (8×3.14×6)=2.67.

[0075] The temperature measuring device is any one of a handheld infrared temperature measuring gun, a thermocouple, and a thermal imager.

[0076] During the deposition process, the elongation of welding wire material A and welding wire material B is 10 mm; welding wire material A is a nickel-based alloy Inconel 625 with a diameter of 1.2 mm, and welding wire material B is a stainless steel alloy SS 316L with a diameter of 1.2 mm.

[0077] The manufacturing method of this embodiment obtains an additive body with an interwoven bimetallic interface prepared based on arc additive manufacturing technology. The additive body is prepared from two different metals. The additive body is deposited by multiple multi-layer welds. The interface between the two different metals of the additive body presents a zigzag or bamboo-shaped shape.

[0078] The present embodiment uses arc additive manufacturing technology to prepare additive bodies with interwoven bimetallic interfaces for applications in high and low temperature environments, including applications in spacecraft or nuclear power plants.

[0079] Example 3

[0080] A method for preparing an additive body having an interwoven bimetallic interface based on arc additive manufacturing technology comprises the following steps:

[0081] S01: After removing the surface dirt and oxide layer of the Q235 substrate, fix it on the workbench, dry the welding wire materials A and B, and then load them into two cold metal transfer arc additive manufacturing systems respectively;

[0082] S02: After the overall data of the structural part is modeled, it is sliced ​​and sliced ​​using the Yanjiu Robot 3D Printing Software (IungoPNT), the molding trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system;

[0083] S03 uses arc additive manufacturing technology and sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd welds and even welds. A cold metal transition arc additive manufacturing system first prints the odd welds with welding wire material A on the substrate. After printing is completed, it is cooled and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, another cold metal transition arc additive manufacturing system prints the even welds with welding wire material B. After printing is completed, it is cooled again and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, the second layer is printed in a cyclic interval until an additive body with an interwoven bimetallic interface is obtained.

[0084] Specifically, the arc welding wire deposition path is to first print odd-numbered passes one, three, five, and seven, then fill the second pass into the gap between the first and third passes, fill the fourth pass into the gap between the third and fifth passes, and fill the sixth pass into the gap between the fifth and seventh passes, and the whole is deposited along the construction direction.

[0085] The cold metal transfer arc additive manufacturing system includes a robotic arm and uses coaxial wire feeding technology. A welding gun and a metal wire outlet are provided at the end of the robotic arm. The robotic arm is movably arranged above the substrate. The welding gun is used to generate an arc to melt the metal wire. The molten metal is deposited layer by layer on the substrate.

[0086] The Q235 substrate has a polycrystalline structure and is prepared by at least one of casting and forging.

[0087] In S03, adjacent deposition layers are rotated 180° and deposited in opposite directions alternately.

[0088] In S03, the process parameters of arc additive manufacturing are as follows: welding speed of 10 mm / s, wire feeding speed of 4 m / min, welding current of 167 A, welding voltage of 15.6 V, and pure argon shielding gas flow rate of 18 L / min.

[0089] The interval width between passes is determined by the welding speed and wire feeding speed. First, the parabolic function relationship y=a+cx is used in SolidWorks software. 2 Modeling a single-layer single-pass weld, we get the relationship:

[0090]

[0091] In formula (1), w is the weld width, i.e. the width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter;

[0092] The relative error between the predicted cross-sectional morphology and the actual cross-sectional morphology was used to obtain the overlapping model, and then mathematical modeling was performed in MATLAB software. Finally, the expression of the weld spacing, that is, the interval width w between passes, was obtained as follows:

[0093]

[0094] According to formula (2), the interval width w between passes is calculated to be 1.33 mm.

[0095] The calculation method is: the wire feeding speed v w The unit is 4m / min, which is converted to wire feeding speed 4m / min=4000mm / min=67mm / s;

[0096] w=5×1.0×67 / (8×3.14×10)=1.33.

[0097] The temperature measuring device is any one of a handheld infrared temperature measuring gun, a thermocouple, and a thermal imager.

[0098] During the deposition process, the elongation of welding wire material A and welding wire material B is 10 mm; welding wire material A is a nickel-based alloy Inconel 625 with a diameter of 1.0 mm, and welding wire material B is a stainless steel alloy SS 316L with a diameter of 1.0 mm.

[0099] The manufacturing method of this embodiment obtains an additive body with an interwoven bimetallic interface prepared based on arc additive manufacturing technology. The additive body is prepared from two different metals. The additive body is deposited by multiple multi-layer welds. The interface between the two different metals of the additive body presents a zigzag or bamboo-shaped shape.

[0100] The present embodiment uses arc additive manufacturing technology to prepare additive bodies with interwoven bimetallic interfaces for applications in high and low temperature environments, including applications in spacecraft or nuclear power plants.

[0101] Example 4

[0102] The only differences between this embodiment and embodiment 1 are: the welding speed is 6 mm / s, the wire feed speed is 8 m / min, the elongation of welding wire material A and welding wire material B is 15 mm, and the diameter of welding wire material A and welding wire material B is 1.2 mm. According to equation (2), the interval width w between passes is calculated to be 5.29 mm.

[0103] The calculation method is: the wire feeding speed v w The unit is 8m / min, which is converted to wire feeding speed 8m / min=8000mm / min=133mm / s;

[0104] w=5×1.2×133 / (8×3.14×6)=5.29.

[0105] It should be understood that in order to streamline the present disclosure and aid understanding of one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the previously disclosed embodiments. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the invention.

[0106] Although the present invention has been described with respect to a limited number of embodiments, it will be apparent to those skilled in the art, having benefit of the foregoing description, that other embodiments are contemplated within the scope of the invention thus described. Furthermore, it should be noted that the language used in this specification has been selected primarily for readability and didactic purposes, rather than for the purpose of explaining or limiting the subject matter of the present invention. Consequently, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative rather than restrictive of the scope of the invention, which is defined by the appended claims.

[0107] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing an additive body with an interwoven bimetallic interface based on arc additive manufacturing technology, characterized in that: The following steps are involved: S01, after removing the surface dirt and oxide layer of the substrate, fix it on the workbench, dry the welding wire material A and welding wire material B, and then load them into two cold metal transfer arc additive manufacturing systems respectively; S02: After the overall data of the structural part is modeled, it is sliced ​​and sliced ​​using the Yanjiu robot 3D printing software IungoPNT, the molding trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system; S03 uses arc additive manufacturing technology, setting the printing path of each layer to intermittent printing. The specific process is as follows: the welds are divided into odd-numbered welds and even-numbered welds. One cold metal transfer arc additive manufacturing system first prints the odd-numbered welds on the substrate with welding wire material A. After printing, it is cooled and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, another cold metal transfer arc additive manufacturing system prints the even-numbered welds with welding wire material B. After printing, it is cooled again and the surface temperature of the deposited layer is monitored with a temperature measuring device. After the deposited layer cools to 200°C, the second layer is printed in an intermittent manner until an additive body with an interwoven bimetallic interface is obtained. In S03, the process parameters of arc additive manufacturing are as follows: welding speed of 6–10 mm / s, wire feeding speed of 4–8 m / min, welding current of 102–167 A, welding voltage of 13.4–15.6 V, and interval width between passes of 1.33–5.29 mm; During the deposition process, the elongation of welding wire material A and welding wire material B was 10-15 mm; welding wire material A was a nickel-based alloy Inconel 625 with a diameter of 1.0-1.2 mm, and welding wire material B was a stainless steel alloy SS 316L with a diameter of 1.0-1.2 mm.

2. The manufacturing method according to claim 1, characterized in that In S01, the substrate is made of Q235 steel plate.

3. The manufacturing method according to claim 1, characterized in that In S03, adjacent deposition layers are rotated 180° and deposited in opposite directions alternately.

4. The manufacturing method according to claim 1, characterized in that The interval width between passes is determined by the welding speed and wire feeding speed. First, the parabolic function relationship is used in SolidWorks software. y = a + cx 2 Modeling a single-layer single-pass weld, we get the relationship: （1） In formula (1), w is the melt width, that is, the width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter; The relative error between the predicted cross-sectional morphology and the actual cross-sectional morphology is used to obtain the overlapping model, and then mathematical modeling is performed in MATLAB software to finally obtain the weld spacing, that is, the width of the interval between passes. w The expression is: （2）。 5. The manufacturing method according to claim 1, characterized in that The temperature measuring device is one of a handheld infrared temperature measuring gun, a thermocouple, and a thermal imager.

6. The manufacturing method according to claim 1, characterized in that During the printing process, pure argon was used as the shielding gas, and the shielding gas flow rate was 15~20 L / min.

7. The additive body having an interwoven bimetallic interface obtained by the manufacturing method according to any one of claims 1 to 6, characterized in that: The additive body is prepared from two different metals, and the additive body is deposited by multiple multi-layer welds. The bonding interface between the two different metals of the additive body presents a zigzag or bamboo-shaped shape.

8. The additive body with a weaved bimetallic interface according to claim 7, characterized in that: Application in spacecraft or nuclear power plants.

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