Additive body with interlaced bimetal interface prepared based on electric arc additive manufacturing technology and manufacturing method and application of additive body

Abstract

The invention discloses an additive body with an interlaced bimetal interface prepared based on an electric arc additive manufacturing technology and a manufacturing method and application of the additive body, and belongs to the technical field of non-ferrous metal processing. The additive body is prepared from two different metals, the additive body is formed by deposition of multiple layers of welding beads, the bonding interface of the two different metals of the additive body is in a sawtooth shape or a bamboo joint shape, and the two materials can be well bonded at the interface; according to the additive body with the interwoven bimetal interface, the material A and the material B are combined to form a new material with good performance, the application field of the material is expanded, and the additive body is low in cost, high in efficiency and suitable for industrial production. According to the manufacturing method, two different materials are used, and the additive body with the interwoven bimetal interface is successfully prepared. According to the method, interval printing and cooling conditions are adopted, so that fine grain structures appear between layers and between welding beads, and the mechanical property of the additive body is effectively improved.

Description

Technical Field

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

[0002] Arc additive manufacturing is an additive manufacturing process that uses an arc as a heat source to melt metal welding wire, and then deposits it layer by layer on a metal substrate according to a set path. Arc additive manufacturing has a short cycle and a high level of automation, and can achieve digital, intelligent and flexible manufacturing. It has a high utilization rate of raw materials and can quickly manufacture parts with more complex shapes and structures, while having fewer restrictions on the size of parts.

[0003] However, most arc additive manufacturing research focuses on manufacturing the same type of materials. In some special applications, a combination of two materials is required. For example, spacecraft will experience extreme high and low temperature environments during flight, and there is an urgent need for a material that can provide different thermal properties in different areas 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 connect dissimilar metals. However, technologies such as friction welding and ultrasonic welding have many disadvantages such as holes and cracks, and poor formability, which makes it difficult to meet the needs of high-quality and precise forming. Diffusion welding requires a long connection cycle, which limits its application.

[0004] Using arc additive manufacturing materials to manufacture metal composites is a current research hotspot. The unique flexibility of using arc additive manufacturing for spatial design and manufacturing in the present invention 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, thereby expanding the application field of the material, having low cost and high efficiency, and being 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, high efficiency, and is suitable for industrial production.

[0007] At the same time, the present invention provides an application of an additive body with an interwoven bimetallic interface prepared based on arc additive manufacturing technology in high temperature 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 with an interwoven bimetallic interface based on arc additive manufacturing technology comprises the following steps:

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

[0011] S02, after the overall data of the structural parts are modeled, the layered slicing is performed through the Yanju Robot 3D Printing Software (IungoPNT), the forming trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system;

[0012] S03, using arc additive manufacturing technology, sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd-numbered welds and even-numbered welds. A cold metal transition arc additive manufacturing system first prints the odd-numbered welds on the substrate with welding wire material A, and then cools after printing. The surface temperature of the deposited layer is monitored by a temperature measuring device until the deposited layer cools to 200°C. Another cold metal transition arc additive manufacturing system then prints the even-numbered welds with welding wire material B, and then cools after printing. The surface temperature of the deposited layer is also monitored by a temperature measuring device. After the deposited layer cools to 200°C, the second layer is then 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 in opposite directions alternately.

[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 interval 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 by SolidWorks software) and the actual cross-sectional morphology was used to obtain the overlap 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:

[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 protective gas during the printing process, and the protective gas flow rate is 15 to 20 L / min.

[0023] Preferably, during the deposition process, the elongation of welding wire material A and welding wire material B are both 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. The two different metal bonding interfaces of the additive body are serrated or bamboo-shaped.

[0025] The invention provides an application of an additive body having an interwoven bimetallic interface prepared by arc additive manufacturing technology 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] The present invention is based on cold metal transition arc additive manufacturing, and proposes a method for preparing an additive body with an interlaced bimetallic interface by simply adjusting the printing path (interval printing method) and cooling conditions. This is mainly because two cold metal transition devices are operated alternately, using two different materials, changing the printing path, using the interval printing method, and controlling the interlayer temperature, the block structure obtained by the traditional deposition strategy is changed, so that the additive body has an interlaced bimetallic interface in the construction direction and the direction perpendicular to the welding gun.

[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 printing an additive body with interwoven bimetallic interface by arc additive in Example 1;

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

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

[0033] Figure 5 The microhardness images of both sides of the interface of the arc additive with interlaced bimetallic interface additive in Example 1;

[0034] Figure 6 The engineering stress-strain picture of the arc-assisted material with interwoven bimetallic interface in Example 1;

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

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0037] Example 1

[0038] A method for preparing an additive body with 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 an 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 transition arc additive manufacturing system.

[0040] (2) After the overall data modeling of the structural part (i.e., the additive body with interwoven bimetallic interface to be manufactured) is completed, layered slicing is performed through the Ingo Robot 3D Printing Software (IungoPNT), the molding trajectory is planned, and the data file is generated and imported into the arc fuse additive manufacturing system (i.e., the cold metal transition 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 a Q235 substrate, and the printing path of each layer is set to interval printing (e.g. Figure 1 and Figure 5 As shown in the figure, the specific process is: the welding wire material A is the nickel-based alloy Inconel625 with a diameter of 1.2 mm, and the material B is the stainless steel alloy SS 316L with a diameter of 1.2 mm. 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 at intervals according to the printing method of the first layer until a certain volume of additive body with an interwoven bimetallic interface 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 calculated 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, the odd-numbered welds and the even-numbered welds are cooled to 200° C. by air cooling after printing.

[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 two different metal bonding interfaces of the additive body present a serrated or bamboo-shaped shape.

[0050] The present embodiment uses arc additive manufacturing technology to prepare an additive body with an interwoven bimetallic interface for application 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 perpendicular to the direction of the welding torch 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 perform energy spectrum analysis on the sample. The line scanning direction was from Inconel 625 to SS 316L. The results are shown in Figure 2. Figure 3 As shown, the Fe and Ni element compositions change smoothly in steps 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, and there is an obvious delamination phenomenon.

[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, 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 the raw materials IN 625 and SS 316L, indicating that a new material with good performance can be created using this technology.

[0056] Figure 7The scanning electron microscope image shows that there are no cracks or holes at the interface of the two materials in this embodiment. The purpose of rotating 180° between layers during deposition is to improve the quality of the deposited thin-walled body and reduce the pores. The calculation method of the interval width w between passes makes the weld filling scientific and reasonable. There are no cracks or holes at the interface of the filled weld, and the bonding performance is excellent.

[0057] In some special applications, such as nuclear power plants and aerospace vehicles, components require different performance in different locations. However, it is almost impossible to achieve this using the characteristics of a single material. Bimetallic material is a new type of composite material. Through the combination of two different materials, the obtained parts or parts of them have different performance in one or more dimensions. The present invention adopts appropriate printing parameters and a method of rationally planning the printing path 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 the interval printing and cooling conditions mainly to make fine grain structures appear between layers and between 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. Two different materials are used, suitable printing parameters and a reasonable printing path are adopted to successfully prepare an additive body with an interwoven bimetallic interface. 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, and is suitable for industrial production.

[0060] Example 2

[0061] A method for preparing an additive body with 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 material A and welding wire material B, and then fill them into two cold metal transfer arc additive manufacturing systems respectively;

[0063] S02, after the overall data of the structural parts are modeled, the layered slicing is performed through the Yanju Robot 3D Printing Software (IungoPNT), the forming trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system;

[0064] S03, using arc additive manufacturing technology, sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd-numbered welds and even-numbered welds. A cold metal transition arc additive manufacturing system first prints the odd-numbered welds on the substrate with welding wire material A, and then cools after printing. The surface temperature of the deposited layer is monitored by a temperature measuring device until the deposited layer cools to 200°C. Another cold metal transition arc additive manufacturing system then prints the even-numbered welds with welding wire material B, and then cools after printing. The surface temperature of the deposited layer is also monitored by a temperature measuring device. After the deposited layer cools to 200°C, the second layer is then 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 an alternating reverse direction.

[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 interval width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter;

[0070] The overlap model is obtained by using the relative error between the predicted cross-sectional morphology and the actual cross-sectional morphology. Then, mathematical modeling is performed in MATLAB software. Finally, the expression of the weld spacing, that is, the interval width w between passes, is 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 It is 4m / min, and the unit conversion is 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 two different metal bonding interfaces of the additive body present a serrated or bamboo-shaped shape.

[0078] The present embodiment uses arc additive manufacturing technology to prepare an additive body with an interwoven bimetallic interface for application 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 with 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 material A and welding wire material B, and then fill them into two cold metal transfer arc additive manufacturing systems respectively;

[0082] S02, after the overall data of the structural parts are modeled, the layered slicing is performed through the Yanju Robot 3D Printing Software (IungoPNT), the forming trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system;

[0083] S03, using arc additive manufacturing technology, sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd-numbered welds and even-numbered welds. A cold metal transition arc additive manufacturing system first prints the odd-numbered welds on the substrate with welding wire material A, and then cools after printing. The surface temperature of the deposited layer is monitored by a temperature measuring device until the deposited layer cools to 200°C. Another cold metal transition arc additive manufacturing system then prints the even-numbered welds with welding wire material B, and then cools after printing. The surface temperature of the deposited layer is also monitored by a temperature measuring device. After the deposited layer cools to 200°C, the second layer is then 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, which adopts coaxial wire feeding technology. A welding gun and a metal wire outlet are arranged 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, and the molten metal is deposited layer by layer on the substrate.

[0086] The Q 235 substrate has a polycrystalline structure and is prepared by at least one of casting or forging.

[0087] In S03, adjacent deposition layers are rotated 180° and deposited in an alternating reverse direction.

[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 interval width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter;

[0092] The overlap model is obtained by using the relative error between the predicted cross-sectional morphology and the actual cross-sectional morphology. Then, mathematical modeling is performed in MATLAB software. Finally, the expression of the weld spacing, that is, the interval width w between passes, is 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 It is 4m / min, and the unit conversion is 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 two different metal bonding interfaces of the additive body present a serrated or bamboo-shaped shape.

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

[0101] Example 4

[0102] The difference between this embodiment and embodiment 1 is that the welding speed is 6 mm / s, the wire feeding 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 formula (2), the interval width w between passes is 5.29 mm.

[0103] The calculation method is: the wire feeding speed v w It is 8m / min, and the unit conversion is 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 in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those 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. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0106] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and didactic purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, 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 illustrative, not restrictive, with respect to the scope of the present 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 principle 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 dirt and oxide layer on the surface of the substrate, fix it on the workbench, dry the welding wire material A and the welding wire material B, and then fill them into two cold metal transfer arc additive manufacturing systems respectively; S02, after the overall data of the structural parts are modeled, the layered slicing is performed through the Yanjiu robot 3D printing software IungoPNT, the forming trajectory is planned, and the data file is generated and imported into the cold metal transfer arc additive manufacturing system; S03, using arc additive manufacturing technology, sets the printing path of each layer to interval printing. The specific process is: the welds are divided into odd-numbered welds and even-numbered welds. A cold metal transition arc additive manufacturing system first prints the odd-numbered welds on the substrate with welding wire material A, and then cools after printing. The surface temperature of the deposited layer is monitored by a temperature measuring device until the deposited layer cools to 200°C. Another cold metal transition arc additive manufacturing system then prints the even-numbered welds with welding wire material B, and then cools after printing. The surface temperature of the deposited layer is also monitored by a temperature measuring device. After the deposited layer cools to 200°C, the second layer is then printed in a cyclic interval until an additive body with an interwoven bimetallic interface is obtained.

2. The manufacturing method according to claim 1, characterized in that: In S01, the base plate 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 an alternating reverse direction.

4. The manufacturing method according to claim 1, characterized in that: 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.

5. The manufacturing method according to claim 4, characterized in that: 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: In formula (1), w is the weld width, i.e. the interval width between passes, v t is the welding speed, v w is the wire feeding speed, d w is the wire diameter; The overlap model is obtained by using the relative error between the predicted cross-sectional morphology and the actual cross-sectional morphology. Then, mathematical modeling is performed in MATLAB software. Finally, the expression of the weld spacing, that is, the interval width w between passes, is obtained as follows:

6. 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.

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

8. The manufacturing method according to claim 1, characterized in that: During the deposition process, the elongation of welding wire material A and welding wire material B are both 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 SS 316L with a diameter of 1.0-1.2 mm.

9. The additive body having an interwoven bimetallic interface prepared by arc additive manufacturing technology according to any one of claims 1 to 8, 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 of the two different metals of the additive body presents a zigzag shape or a bamboo-joint shape.

10. The use of the arc additive manufacturing technology to prepare an additive body with an interwoven bimetallic interface in high temperature and low temperature environments according to claim 9, characterized in that: Including applications in spacecraft or nuclear power plants.

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