TIG arc additive manufacturing system and manufacturing method for cross-structure metal components

Abstract

The present invention discloses a TIG arc additive manufacturing system and method for cross-structured metal components. The system comprises a robotic system, an additive power supply, a digital wire feeder, and a welding torch mounted on the robot's distal end. The robotic system is communicatively connected to the additive power supply and the digital wire feeder, which delivers welding wire to the torch. This system and method can address the challenges of difficult path planning and quality control in the TIG arc additive manufacturing process for cross-structured metal components.

Description

Technical Field

[0001] This invention relates to the field of electric arc additive manufacturing technology, and more specifically to a TIG electric arc additive manufacturing system and method for cross-structure metal components. Background Technology

[0002] Wire-arcadditive manufacturing (WAAM) is an additive manufacturing technology that uses an electric arc as a heat source and metal wire as the raw material. Compared with other metal additive manufacturing processes, WAAM has advantages such as high production efficiency, low raw material cost, low equipment cost, flexible forming control, and simple forming system structure, and has become a research hotspot in the field of additive manufacturing.

[0003] In aerospace, rail vehicle, and weapons manufacturing, "lightweight and high strength" has become one of the important goals in component design and manufacturing, and large-size frame design has been increasingly widely used. Cross structures are a common structural feature of large-size frame parts, and also the structural feature with the greatest difficulty in molding control. The molding quality of cross structures directly determines the final molding quality of large-size frame components.

[0004] In current theoretical research and engineering applications of arc additive manufacturing, the consumable electrode process holds a dominant position due to its mature equipment technology and high manufacturing efficiency. However, due to the strongly coupled heat and mass transfer characteristics of the consumable electrode process, when forming cross-structure metal components using this process, bulges inevitably occur at the path overlap points. (The consumable electrode process uses welding wire as the electrode; as long as the arc is ignited, the wire must be continuously fed. If the wire feeding stops, the arc will also extinguish. Therefore, when forming cross structures using the consumable electrode process, without taking additional measures such as reducing the wire feeding speed or extinguishing the arc and stopping the wire feeding when the welding torch passes the intersection for the second time, the amount of welding wire filling at the path intersection will definitely be greater than at other locations, causing bulges.) Figure 1 As shown), this affects subsequent additive manufacturing. Therefore, it's necessary to use composite subtractive processing during the additive manufacturing process (e.g., removing excess material at overlapping areas via mechanical milling after additive manufacturing to ensure the intersection maintains the same height as other locations) or a tangent circular arc path method (e.g., changing two intersecting straight paths into two tangent circular arc paths when forming an intersecting structure, effectively avoiding vertical overlap between the two paths, which would cause repeated wire feeding at the same location, leading to protrusions, such as...). Figure 2(As shown) Eliminating interference from protrusions at path intersections increases equipment costs and path planning difficulty, while also reducing manufacturing efficiency. (For example, additive and subtractive manufacturing processes generally require the addition of a robot equipped with a milling head to form a dual-robot system, significantly increasing costs. Adding milling after additive manufacturing also significantly extends component manufacturing time, reducing production efficiency. While using tangential circular arc paths can avoid protrusions at intersections due to overlapping paths to some extent, the tangent points are prone to forming defects such as necking. In practice, the two circular arc paths cannot be completely tangent; they must overlap to some extent. However, determining the overlap size and the amount of overlap to minimize forming defects such as necking while ensuring the forming dimensions of the intersecting structure is extremely difficult in path planning and calculation.) Therefore, developing an arc additive manufacturing process with high manufacturing efficiency and high forming quality for intersecting metal components has significant theoretical research and engineering application value.

[0005] Therefore, how to provide a TIG electric arc additive manufacturing system and method for cross-structure metal components that can simultaneously guarantee the forming efficiency and forming quality of cross-structure metal components is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a TIG arc additive manufacturing system and method for cross-structure metal components that can simultaneously ensure the efficiency and quality of cross-structure metal component forming.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A TIG additive manufacturing system for cross-structure metal components includes: a robot system, an additive power supply, a digital wire feeder, and a welding torch mounted on the end shaft of the robot system. The robot system is connected to the additive power supply and the digital wire feeder via an industrial bus. The digital wire feeder feeds the welding wire onto the welding torch. The robot system can drive the welding torch to perform additive manufacturing of the cross-structure metal components by first following the additive path of arc initiation point 1 at the head end of the transverse single-wall component → arc extinguishing point 2 at the tail end of the transverse single-wall component → arc extinguishing point 3 at a distance L from the tail end in the opposite direction; and then following the additive path of arc initiation point 4 at the head end of the longitudinal single-wall component → point 5 reaching one side of the transverse single-wall component → lifting height point 6 → longitudinal translation point 7 → descending to the other side of the transverse single-wall component point 8 → arc extinguishing point 9 at the tail end of the longitudinal single-wall component → arc extinguishing point 10 at a distance L from the tail end in the opposite direction.

[0009] As can be seen from the above technical solution, compared with the prior art, this invention discloses a TIG arc additive manufacturing system for cross-structure metal components. A digital wire feeder is connected to a robot system and achieves control data interaction. During the additive manufacturing process, the digital wire feeder receives instructions from the robot system in real time and adjusts the wire feeding speed parameters. The additive power supply is also connected to the robot system and achieves control data interaction. During the additive manufacturing process, the additive power supply receives instructions from the robot system in real time and adjusts the current parameters. This system uses ABB's Rapid programming language and, through secondary development, completes the development of the additive control system based on the robot system's control platform. This allows the robot system to achieve real-time coordinated control of the parameters of the additive power supply and the digital wire feeder during robot movement. This method is superior to existing additive manufacturing systems that require a separate host computer to control the robot, additive power supply, and digital wire feeder in terms of cost, parameter control coordination, and control speed. Therefore, this system achieves high-quality and efficient additive manufacturing of cross-structure metal components by utilizing the robot to achieve real-time coordinated control of the welding torch's spatial position and posture, additive current parameters, and wire feeding parameters during the arc additive manufacturing process.

[0010] Furthermore, the digital wire feeder is connected to the robot system via an RS485 bus to enable control data interaction.

[0011] Furthermore, the additive power supply is connected to the robot system via an Ethernet / IP bus to enable control data interaction.

[0012] This invention provides a TIG arc additive manufacturing method for cross-structure metal components, which involves the following steps using the aforementioned TIG arc additive manufacturing system for cross-structure metal components:

[0013] S1: Plan the spatial movement additive manufacturing path of the welding torch: The path is as follows: first, follow the arc starting point 1 at the head end of the transverse single-wall component → the arc ending point 2 at the tail end of the transverse single-wall component → the arc ending point 3 at a distance L from the tail end in the opposite direction; then follow the additive manufacturing path as follows: arc starting point 4 at the head end of the longitudinal single-wall component → point 5 at one side of the transverse single-wall component → lifting height point 6 → longitudinal translation point 7 → descending to the other side of the transverse single-wall component point 8 → the arc ending point 9 at the tail end of the longitudinal single-wall component → the arc ending point 10 at a distance L from the tail end in the opposite direction.

[0014] S2: Before performing arc additive manufacturing, the additive substrate is pretreated to fully remove impurities from the surface of the additive substrate;

[0015] S3: Under the coordinated control of the robot system, the additive power supply, and the digital wire feeder, the welding torch performs an additive manufacturing process on the surface of the additive substrate according to the additive path in S1.

[0016] S4: Repeat S3 to perform additive manufacturing through multiple processes until the additive manufacturing of the cross-structure metal components is completed.

[0017] Furthermore, S3 specifically includes:

[0018] The welding torch first travels to the arc initiation point 1 at the head end of the transverse single-walled component. At this position, the arc initiation current and wire feeding speed are I0 and 0, respectively. Then, the current and wire feeding speed are increased to I1 and S1, respectively. At the same time, the welding torch travels towards the tail end 2 of the transverse single-walled component. When it reaches the tail end 2, the current and wire feeding speed decrease to I2 and S2, respectively. Then, the welding torch travels in the opposite direction to the arc extinguishing point 3 at a distance L from the tail end. At this time, the arc extinguishing current and wire feeding speed are I0 and 0, respectively.

[0019] Then, the welding torch travels to the arc-starting point 4 at the head end of the longitudinal single-walled component. At this time, the current and wire feed speed are increased from I0 and 0 to I1 and S1, respectively. Simultaneously, the welding torch moves towards point 5 on the side of the transverse single-walled component. When it reaches point 5 on the side of the transverse single-walled component, the current and wire feed speed decrease to I2 and S2, respectively. Wire feed is continued at point 5 for 1-3 seconds. Subsequently, the current drops to the arc-extinguishing current I0, and the wire feed speed drops to 0. The welding torch rises 3-5 mm to point 6, then moves to point 7, and the welding torch descends 3-5 mm to point 6. After point 8, the current and wire feed speed are increased to I2 and S2 respectively, and the wire feed is maintained at point 8 for 1-3 seconds. Then the current and wire feed speed are restored to I1 and S1, completing the arc additive manufacturing of the transverse single-walled part and the longitudinal single-walled part at the intersection. Then the welding torch continues to move towards the tail end point 9 of the longitudinal single-walled part. When it reaches the tail end point 9 of the longitudinal single-walled part, the current and wire feed speed decrease to I2 and S2 respectively. Then the welding torch moves in the opposite direction to the arc extinguishing point 10 at a distance L from the tail end. At this time, the current and wire feed speed are I0 and 0 respectively.

[0020] The beneficial effects of adopting the above technical solution are as follows: Utilizing the decoupled heat and mass transfer characteristics of the TIG process, the ignition and wire feeding processes are independent, allowing wire feeding to be stopped while the arc is ignited—something the consumable electrode process cannot do. Furthermore, when forming cross structures, wire feeding can be stopped and the current reduced to a minimum when the welding torch reaches the overlapping position. Stopping wire feeding prevents bulging at the cross joint due to repeated wire filling, and reducing the current avoids frequent arc starting and ending (where defects such as porosity and cracks are easily generated). The low current is also insufficient to melt the already formed part of the component, thus avoiding a reduction in component forming quality. In addition, points 1 and 4 of the component are the arc initiation points, and points 3 and 10 are the arc extinguishing points. The forming control strategy can be carried out by arc additive manufacturing according to the applicant's authorized patent (202111581391.7-System and method for improving the accuracy and efficiency of aluminum alloy GTAWWAAM), thereby ensuring the forming quality of the arc initiation and arc extinguishing ends of the component.

[0021] Furthermore, the speed range for raising the welding torch at point 5, moving it from point 6 to point 7, and lowering it at point 7 should be between 10 mm / s and 30 mm / s.

[0022] The beneficial effects of adopting the above technical solution are: it can prevent the component from collapsing due to the arc dwell time caused by the welding torch moving too slowly, and prevent the mechanical structure of the robot from being greatly impacted due to the welding torch moving too fast.

[0023] Furthermore, points 5 and 8 are 0-3mm away from the edges of the formed transverse single-walled component on both sides.

[0024] Furthermore, in S2: the pretreatment method is to process the additive substrate by mechanical grinding and wipe the surface of the additive substrate with an alcohol solution.

[0025] The beneficial effects of adopting the above technical solution are: it can effectively remove impurities such as wear debris and grease from the surface of the additive substrate, thereby preventing impurities from entering the additive component and forming defects such as inclusions and pores, which would affect the component performance. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1This is a schematic diagram showing the protrusions generated at the path overlap when forming a cross-structure metal component using a melting electrode process, as provided by the present invention.

[0028] Figure 2 This is a schematic diagram of the path when forming a cross-structure metal component using a tangent circular arc path method, as provided by the present invention.

[0029] Figure 3 A schematic diagram of the TIG arc additive manufacturing system for cross-structure metal components provided by the present invention.

[0030] Figure 4 A schematic diagram of the TIG arc additive manufacturing process for cross-structure metal components.

[0031] Figure 5 This is a schematic diagram of the arc additive manufacturing path and control points.

[0032] Figure 6 This diagram illustrates the additive current control strategy at different locations along the additive manufacturing path.

[0033] Figure 7 A schematic diagram illustrating the wire feeding speed control strategy at different locations along the additive manufacturing path. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Figure 1 and Figure 2 The reference is DonghongDing,ChenShen,ZengxiPanetal.Towardsanautomatedroboticarc-welding-basedadditivemanufacturingsystemfromCADtofinishedpart[J].Computer-AidedDesign.2016.73:66-75.

[0036] See Figures 3-7This invention discloses a TIG additive manufacturing system for cross-structure metal components, including: a robot system 100, an additive power supply 200, a digital wire feeder 300, and a welding torch 400 mounted on the end shaft of the robot system 100. The robot system 100 is communicatively connected to the additive power supply 200 and the digital wire feeder 300. The digital wire feeder 300 feeds the welding wire onto the welding torch 400. The robot system 100 can drive the welding torch 400 to first move along the transverse single-wall component 5... The additive manufacturing of the cross-structure metal component 500 is carried out according to the following additive manufacturing path: starting point 1 of the head end of 001 → ending point 2 of the tail end of the transverse single-wall component 5001 → ending point 3 of the reverse distance from the tail end L; then the additive manufacturing of the cross-structure metal component 500 is carried out according to the following additive manufacturing path: starting point 4 of the head end of the longitudinal single-wall component 5002 → ending point 5 of the transverse single-wall component 5001 → lifting height point 6 → longitudinal translation point 7 → descending to the other side of the transverse single-wall component 5001 → ending point 9 of the longitudinal single-wall component 5002 → ending point 10 of the reverse distance from the tail end L.

[0037] Specifically, the digital wire feeder 300 is connected to the robot system 100 via an RS485 bus to achieve control data interaction.

[0038] The additive power supply 200 is connected to the robot system 100 via an Ethernet / IP bus to enable control data interaction.

[0039] The TIG arc additive manufacturing method for cross-structure metal components of the present invention uses the above-mentioned TIG arc additive manufacturing system for cross-structure metal components to perform the following steps:

[0040] S1: Plan the spatial movement additive manufacturing path of the welding torch 400: The path is as follows: first, follow the arc starting point 1 at the head end of the transverse single-wall component 5001 → the tail end point 2 of the transverse single-wall component 5001 → the arc extinguishing point 3 at a distance L from the tail end in the opposite direction; then follow the additive manufacturing path as follows: arc starting point 4 at the head end of the longitudinal single-wall component 5002 → point 5 on one side of the transverse single-wall component 5001 → lifting height point 6 → longitudinal translation point 7 → descending to point 8 on the other side of the transverse single-wall component 5001 → the tail end point 9 of the longitudinal single-wall component 5002 → the arc extinguishing point 10 at a distance L from the tail end in the opposite direction.

[0041] S2: The additive substrate 600 is processed by mechanical grinding, and the surface of the additive substrate 600 is wiped with alcohol solution to fully remove the grinding debris and grease and other impurities on the surface of the additive substrate.

[0042] S3: Under the coordinated control of robot system 100, additive power supply 200 and digital wire feeder 300, welding torch 400 performs an additive manufacturing process on the surface of additive substrate 600 according to the additive path in S1.

[0043] S4: Repeat S3 to perform additive manufacturing of multiple processes until the additive manufacturing of the cross-structure metal component 500 is completed.

[0044] Specifically, S3 includes:

[0045] The welding torch 400 first moves to the arc-starting point 1 at the beginning of the transverse single-walled component 5001. At this position, the arc-starting current and wire feed speed are I0 and 0, respectively. Then, the current and wire feed speed are increased to I1 and S1, respectively. Simultaneously, the welding torch 400 moves towards the tail end 2 of the transverse single-walled component. When it reaches the tail end 2, the current and wire feed speed decrease to I2 and S2, respectively. Then, the welding torch 400 moves in the opposite direction to the arc-extinguishing point 3, a distance L from the tail end. At this point, the arc-extinguishing current and wire feed speed are I0 and 0, respectively. Then, the welding torch 400 moves to the arc-starting point 4 at the beginning of the longitudinal single-walled component 5002. At this point, the current and wire feed speed are increased from I0 and 0, respectively. The current and wire feed speed are increased to I1 and S1, respectively, while the welding torch 400 moves towards point 5 on one side of the transverse single-wall component 5001. When it reaches point 5 on one side of the transverse single-wall component 5001, the current and wire feed speed are reduced to I2 and S2, respectively. Wire feed is continued at point 5 for 1-3 seconds. (The welding torch should continue feeding wire at point 5 for a period of time to prevent necking defects caused by insufficient wire filling. If the current is not reduced, it is very easy for the formed part of the component to melt and collapse due to heat. Although the low current and low wire feed speed process will reduce manufacturing efficiency to some extent, it can effectively avoid the melting and collapse of the formed part of the component. Moreover, even with low wire feed speed parameters, the welding torch needs to stay at point 5 to feed wire.) The wire feeding time generally does not exceed 3 seconds, and its impact on manufacturing efficiency is limited. Then, the current is reduced to the arc-extinguishing current I0, the wire feed speed is reduced to 0, and the welding torch is raised 3-5 mm to point 6, then moved to point 7. After the welding torch is lowered 3-5 mm to point 8, the current and wire feed speed are increased to I2 and S2 respectively, and wire feeding is continued at point 8 for 1-3 seconds. (The welding torch should continue feeding wire at point 8 for a period of time to prevent necking defects due to insufficient wire filler. If the current is not reduced, it is very easy for the already formed part of the component to melt and collapse due to heat. Although the low current and low wire feed speed process will reduce manufacturing efficiency to some extent, it can effectively prevent the already formed part from collapsing.) Partial melting collapses, and even with small wire feed speed parameters, the welding torch generally does not need to stay at point 5 for more than 3 seconds to feed the wire, so the impact on manufacturing efficiency is limited. Then the current and wire feed speed are restored to I1 and S1, completing the arc additive manufacturing of the transverse single-wall part 5001 and the longitudinal single-wall part 5002 at the intersection. Then the welding torch 400 continues to move towards the tail end point 9 of the longitudinal single-wall part 5002. When it reaches the tail end point 9 of the longitudinal single-wall part 5002, the current and wire feed speed drop to I2 and S2, respectively. Then the welding torch 400 moves in the opposite direction to the arc extinguishing point 10 at a distance L from the tail end. At this time, the current and wire feed speed are I0 and 0, respectively.

[0046] In the above, the arc initiation and arc extinguishing currents I0 are generally small, serving to maintain the arc from being extinguished and to avoid repeated arc initiation and extinguishing. They are generally selected in the range of 10-30A.

[0047] In the above manufacturing method, in order to prevent the welding torch from moving too slowly, resulting in a long arc dwell time and causing the component to collapse, and to prevent the welding torch from moving too fast, resulting in a large impact on the mechanical structure of the robot, the speed range of raising the welding torch 400 at point 5, moving it from point 6 to point 7, and lowering the welding torch 400 at point 7 should be between 10 mm / s and 30 mm / s.

[0048] In the above-mentioned planned path, points 5 and 8 are 0-3mm away from the edges of the formed transverse single-wall component on both sides (the selection is mainly based on the material type (aluminum alloy, titanium alloy, high temperature alloy, etc.) and the wall thickness of the formed component).

[0049] In the aforementioned manufacturing system and method, the robot in the robotic system is a six-axis robot with a maximum arm span of 1.44m, a spatial repeatability of 0.05mm, and a maximum load of 5kg on the sixth axis wrist. Based on the Rapid language, the robot is equipped with CAN bus and RS485 bus communication control interfaces through secondary development, supporting Modbus and standard CAN communication protocols. During the movement, it can issue parameter control commands to the additive power supply and digital wire feeder in real time through the industrial bus according to process requirements.

[0050] The TIG additive manufacturing power supply has a rated output base current amplitude of 300A and supports multiple current output modes, including ordinary DC, composite pulse DC, ordinary AC, and composite pulse AC. The AC polarity frequency is 0-100Hz, with a duty cycle of 0-100%; the pulse current frequency is 0-50kHz, with a pulse current amplitude of 0-100A and a duty cycle of 0-100%. The power supply features CAN bus communication control, allowing it to receive real-time commands from the robot system during arc additive manufacturing and modify parameters such as additive current amplitude, frequency, and duty cycle. The switching time for the power supply's output current parameters after receiving a command from the robot system is less than 5ms.

[0051] The digital wire feeder supports high-precision adjustment of the wire feeding speed within the range of 0.5-12 m / min, and supports multiple wire feeding modes such as continuous wire feeding, pulsed wire feeding, and fixed-length wire feeding. It can control multiple parameters, including the wire feeding speed rise / fall rate, wire feeding speed, retraction speed, and arc filling speed. The digital wire feeder has an RS485 bus interface and supports the Modbus communication protocol, allowing it to receive commands from the robot system in real time during additive manufacturing and modify parameters such as wire feeding speed and arc filling speed. The switching time for wire feeding parameters after receiving control commands is less than 10 ms.

[0052] The TIG arc additive manufacturing system and method for cross-structure metal components provided in this invention have been developed and optimized for the forming control strategy of arc additive manufacturing of cross-structure metal components. Utilizing the independent decoupling of the heat transfer (arc) and mass transfer (wire feeding) processes in the TIG process, the system achieves real-time coordinated control of the welding torch's spatial position and posture, additive current parameters, and wire feeding parameters. A 5→6→7→8 path planning method is used to complete the forming of the cross positions. Points 2 to 3 and 9 to 10 represent the arc extinguishing control strategy, which can be found in the authorized patent (202111581391.7 - System and Method for Improving the Accuracy and Efficiency of Aluminum Alloy GTAWWAAM). This invention eliminates the need for additional subtractive processing equipment and other auxiliary equipment, reducing equipment costs and path planning difficulty, simplifying the additive manufacturing process of cross-structure metal components, and improving additive manufacturing efficiency.

[0053] This invention effectively solves the problem of unavoidable protrusions at the path overlap points in the forming of cross-structure metal components using the fused electrode arc additive manufacturing process, which affects subsequent manufacturing processes. Furthermore, compared to the fused electrode process using tangential arc paths, this strategy has lower path planning difficulty (cross-shaped path) and lower difficulty in controlling the quality of component forming. The system and method proposed in this invention have high theoretical research and engineering application value.

[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A TIG arc additive manufacturing method for cross-structured metal components, characterized in that, The system used in this method is a cross-structure metal component TIG arc additive manufacturing system, which includes: a robot system (100), an additive power supply (200), a digital wire feeder (300), and a welding torch (400) mounted on the end shaft of the robot system (100). The robot system (100) is communicatively connected to the additive power supply (200) and the digital wire feeder (300). The steps of this method are as follows: S1: Plan the spatial movement additive manufacturing path of the welding torch (400): The path is as follows: first, follow the arc starting point 1 at the head end of the transverse single-wall component (5001) → the tail end point 2 of the transverse single-wall component (5001) → the arc extinguishing point 3 at a distance L from the tail end in the opposite direction; then follow the additive manufacturing path as follows: arc starting point 4 at the head end of the longitudinal single-wall component (5002) → point 5 reaching one side of the transverse single-wall component (5001) → lifting height point 6 → longitudinal translation point 7 → descending to the other side of the transverse single-wall component (5001) point 8 → the tail end point 9 of the longitudinal single-wall component (5002) → the arc extinguishing point 10 at a distance L from the tail end in the opposite direction. S2: Before performing arc additive manufacturing, the additive substrate (600) is pretreated to fully remove impurities from the surface of the additive substrate (600); S3: Under the coordinated control of the robot system (100), the additive power supply (200), and the digital wire feeder (300), the welding torch (400) performs an additive manufacturing process on the surface of the additive substrate (600) according to the additive path in S1. S4: Repeat S3 to perform additive manufacturing of multiple processes until the additive manufacturing of the cross-structure metal component (500) is completed; S3 specifically includes: The welding torch (400) first moves to the arc-starting point 1 at the head end of the transverse single-wall component (5001). At this position, the arc-starting current and wire feeding speed are I0 and 0, respectively. Then, the current and wire feeding speed are increased to I1 and S1, respectively. At the same time, the welding torch (400) moves towards the tail end 2 of the transverse single-wall component. When it reaches the tail end 2 of the transverse single-wall component, the current and wire feeding speed decrease to I2 and S2, respectively. Then, the welding torch (400) moves in the opposite direction to the arc-extinguishing point 3 at a distance L from the tail end. At this time, the arc-extinguishing current and wire feeding speed are I0 and 0, respectively. Then, the welding torch (400) moves to the arc-starting point 4 at the head end of the longitudinal single-wall component (5002). At this time, the current and wire feeding speed are increased from I0 and 0 to I1 and S1, respectively. Simultaneously, the welding torch (400) moves towards point 5 on the side of the transverse single-wall component (5001). When it reaches point 5 on the side of the transverse single-wall component (5001), the current and wire feeding speed are reduced to I2 and S2, respectively. Wire feeding continues at point 5 for 1-3 seconds. Then, the current drops to the arc-extinguishing current I0, the wire feeding speed drops to 0, the welding torch (400) rises 3-5 mm to point 6, then moves to point 7, and the welding torch descends 3-5 mm to point 8. Then, the current and wire feeding speed are increased to I2 and S2 respectively, and the wire is fed continuously at point 8 for 1-3 seconds. Then the current and wire feeding speed are restored to I1 and S1, completing the arc additive manufacturing of the transverse single-wall part (5001) and the longitudinal single-wall part (5002) at the intersection. Then the welding torch (400) continues to move towards the tail end point 9 of the longitudinal single-wall part (5002). When it reaches the tail end point 9 of the longitudinal single-wall part (5002), the current and wire feeding speed decrease to I2 and S2 respectively. Then the welding torch (400) moves in the opposite direction to the arc extinguishing point 10 at a distance L from the tail end. At this time, the current and wire feeding speed are I0 and 0 respectively.

2. The TIG arc additive manufacturing method for cross-structure metal components according to claim 1, characterized in that, The speed range for raising the welding torch (400) at point 5, moving it from point 6 to point 7, and lowering it at point 7 should be between 10 mm / s and 30 mm / s.

3. The TIG arc additive manufacturing method for cross-structure metal components according to claim 1, characterized in that, Points 5 and 8 are 0-3mm away from the edges of the formed transverse single-walled part on both sides.

4. The TIG arc additive manufacturing method for cross-structure metal components according to claim 1, characterized in that, In S2: the pretreatment method is to process the additive substrate (600) by mechanical grinding and wipe the surface of the additive substrate (600) with an alcohol solution.

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