A method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology

Abstract

This invention discloses a method for reinforcing steel pipe joints based on arc-wire additive manufacturing technology, comprising the following steps: Step S1, predicting the stress and strain concentration of the steel pipe joint and determining the area to be reinforced based on the dimensions of the steel pipe component; Step S2, cleaning the area to be reinforced on the surface of the steel pipe component, removing the protective layer and oxide layer; Step S3, using arc-wire additive manufacturing technology, performing arc-wire additive printing along an S-shaped trajectory on the corresponding area to be reinforced on the surface of the steel pipe component, and then printing layer by layer to form a metal additive reinforced entity with an arc surface; Step S4, grinding and softening the arc surface of the reinforced entity under complete cooling, grinding the arc surface into a smooth curved surface. This invention, through reasonable design, can improve the load-bearing capacity of the steel pipe joint while greatly reducing the local stress and strain concentration of the pipe joint, with high material utilization and low cost.

Description

Technical Field

[0001] This invention relates to the field of steel structure building technology, and in particular to a method for reinforcing steel pipe joints based on electric arc wire additive manufacturing technology. Background Technology

[0002] Due to their excellent mechanical properties, welded steel pipe structures have been widely used in the spatial structures of various modern buildings, such as platforms, stadiums, bridges, and offshore platforms. However, failure in steel pipe structures often occurs at the joints, necessitating repair or reinforcement of these joints. To meet the design requirements for strong joints, localized reinforcement is often employed to enhance their load-bearing capacity.

[0003] Existing reinforcement methods for steel pipe joints generally include ring plate reinforcement, internal stiffening ring reinforcement, internal insert plate reinforcement, and pad plate reinforcement. Among these, the internal stiffening ring and internal insert plate methods have significant drawbacks, requiring the reinforcement to be placed inside the main pipe, making the construction process relatively complex. While pad plate and ring plate reinforcement can improve the load-bearing capacity of the pipe joint, they still suffer from the problem of hot stress concentration at the corners of the joint, and the location of joint failure simply shifts from the original weld failure point to the connection between the reinforcement and the steel pipe.

[0004] Therefore, there is an urgent need for a method to strengthen steel pipe joints in order to optimize the reinforcement design of pipe joints in engineering applications. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, embodiments of the present invention provide a method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology, thereby reinforcing the steel pipe joints and improving their load-bearing capacity.

[0006] A method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to an embodiment of the present invention includes the following steps:

[0007] Step S1: Predict the stress and strain concentration of the steel pipe joint and determine the area to be reinforced by additive manufacturing based on the size of the steel pipe component. The steel pipe joint is the connection area where the branch pipe connects to the main pipe.

[0008] Step S2: Clean the area to be reinforced on the surface of the steel pipe component, and remove the protective layer and oxide layer on the surface of the steel pipe component;

[0009] Step S3: Using arc wire additive manufacturing technology, arc wire additive printing is performed along an S-shaped trajectory in the area to be reinforced on the surface of the steel pipe component. Layer by layer, an arc-shaped reinforced metal additive body is formed, thereby reinforcing the steel pipe node through additive manufacturing.

[0010] Step S4: Cool the reinforced entity with curved surface after additive manufacturing. In the fully cooled state, grind and soften the curved surface of the reinforced entity with curved surface to make it a smooth curved surface.

[0011] In optional or preferred embodiments, the steel pipe node is a round steel pipe node or a square steel pipe node.

[0012] In optional or preferred embodiments, the steel pipe node is a T-type node, a Y-type node, or a K-type node.

[0013] In optional or preferred embodiments, the area to be reinforced by additive manufacturing includes additive ranges extending axially and radially from the connection point between the branch pipe and the main pipe, respectively. The maximum length of this extension is defined as l0, where l0 is 0.5-1 times the outer diameter of the branch pipe. Furthermore, the radial extension of the branch pipe to the main pipe does not exceed the side surface of the main pipe. Further, the area to be reinforced by additive manufacturing also includes an additive range extending axially from the connection point between the main pipe and the branch pipe, with the extension length being the same as the axial extension length of the area to be reinforced by additive manufacturing in the main pipe.

[0014] In an optional or preferred embodiment, the cleaning operation in step S2 includes: first, removing impurities from the surface of the steel pipe at the steel pipe joint with acetone before additive manufacturing, and then removing the protective layer and oxide film from the surface of the steel pipe at the steel pipe joint with a wire brush.

[0015] In an optional or preferred embodiment, in step S3, a multi-axis robotic arm is used to adjust the position of the welding torch head during arc wire additive manufacturing.

[0016] In an optional or preferred embodiment, in step S3, the arc wire additive manufacturing technology is a cold metal transition arc wire additive manufacturing process. The process parameters used in the arc wire additive manufacturing technology are: welding current of 130-150A, welding voltage of 16-18V, welding speed of 0.5-0.6m / min, and wire feeding speed of 5.5-6.5m / min.

[0017] In an optional or preferred embodiment, in step S3, during the additive manufacturing reinforcement process, a multi-layer additive manufacturing process is adopted, and the thickness of each additive manufacturing reinforcement layer is 2.0~3.0mm.

[0018] In an optional or preferred embodiment, in step S3, during the additive manufacturing reinforcement process, the additive layer material is a metal wire with the same material and strength as the steel pipe node.

[0019] Based on the above technical solution, the embodiments of the present invention have at least the following beneficial effects: The above technical solution uses arc-wire additive manufacturing technology to progressively deposit metal additive entities of arbitrary shapes to reinforce steel pipe joints, thereby improving the load-bearing capacity of the steel pipe joints. Simultaneously, the arc-shaped additive form can significantly reduce local stress and strain concentration in the steel pipe joints, ensuring good load-bearing performance. It is estimated that the stress and strain concentration of the steel pipe joints will be reduced by 40-50% after reinforcement. The present invention can significantly reduce local stress and strain concentration in steel pipe joints while improving their load-bearing capacity. It also boasts high material utilization, and the additive layer material and the substrate surface are metallurgically bonded, ensuring good load-bearing performance of the joint. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a schematic diagram of overhead welding of the pipe joint;

[0022] Figure 2 This is a stress analysis diagram of a pipe joint;

[0023] Figure 3 This is a schematic diagram of the structure of the square steel pipe node before reinforcement in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure after the square steel pipe node is reinforced in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the circular steel pipe node before reinforcement in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure after the circular steel pipe node is reinforced in an embodiment of the present invention. Detailed Implementation

[0027] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0029] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0031] Currently, for structural connections of pipe joints, laser additive manufacturing can be used. This technology employs coaxial powder feeding additive manufacturing, and when overhead welding is required, the angle of the pipe joint can be adjusted to avoid overhead welding. However, pipe joint reinforcement is for reinforcing existing pipe joint structures, and the welding angle cannot be adjusted like that for newly constructed pipe joints. Therefore, when overhead welding is required, if... Figure 1 As shown, on the one hand, it is difficult to guarantee the quality of additive manufacturing, making it difficult to ensure the mechanical properties of the pipe joint connection; on the other hand, it also results in a significant waste of materials. Considering this point, laser additive manufacturing is not suitable for reinforcing existing pipe joint structures. Therefore, if existing pipe joint structures are to be reinforced, as mentioned in the background art, the current methods still include welding and fixing using ring plate reinforcement, internal stiffening ring reinforcement, internal insert plate reinforcement, and pad plate reinforcement.

[0032] This invention discloses a method for reinforcing steel pipe joints based on arc-fused-wire additive manufacturing technology, comprising the following steps:

[0033] Step S1: Predict the stress and strain concentration of the steel pipe joint and determine the area to be reinforced by additive manufacturing based on the size of the steel pipe component.

[0034] The steel pipe joint is the connection area where the branch pipe connects to the main pipe. The steel pipe joint can be a T-type, Y-type, or K-type joint, or other types of joints.

[0035] In practical applications, the steel pipe joints are either round or square steel pipe joints. Referring to Embodiment 1, using a square steel pipe joint as an example, the method for reinforcing steel pipe joints based on arc-fused-wire additive manufacturing technology is described below; referring to Embodiment 2, using a round steel pipe joint as an example, the method for reinforcing steel pipe joints based on arc-fused-wire additive manufacturing technology is described below; of course, the method for reinforcing steel pipe joints of this invention can be applied to the reinforcement processes of other types of steel pipes.

[0036] Step S2: Clean the area to be reinforced on the surface of the steel pipe component, and remove the protective layer and oxide layer on the surface of the steel pipe component.

[0037] Specifically, the cleaning process includes: first, using acetone to remove impurities from the surface of the steel pipe at the joint, and then using a wire brush to remove the protective layer and oxide film from the surface of the steel pipe at the joint.

[0038] Step S3 involves using arc-wire additive manufacturing technology to perform arc-wire additive printing along an S-shaped trajectory on the surface of the steel pipe component, corresponding to the area to be reinforced. Layer by layer, an arc-shaped reinforced metal additive structure is formed, thereby reinforcing the steel pipe joint through additive manufacturing. During the additive manufacturing process, a multi-layer additive manufacturing process is employed, with each layer having a thickness of 2.0~3.0mm. The additive layer material is a metal wire with the same material and strength as the steel pipe joint. Alternatively, in some other embodiments, a metal wire with a similar material and strength to the component to be reinforced may be used.

[0039] Preferably, a multi-axis robotic arm is used to adjust the position of the welding torch head during arc wire additive manufacturing.

[0040] In applications, arc wire additive manufacturing technology is a cold metal transfer (CMT) arc wire additive manufacturing process. The process parameters for arc wire additive manufacturing technology are: welding current of 130-150A, welding voltage of 16-18V, welding speed of 0.5-0.6m / min, and wire feed speed of 5.5-6.5m / min. The shielding gas used in arc wire additive manufacturing technology is argon or helium.

[0041] Step S4: Cool the reinforced solid with curved surface after additive manufacturing. In the fully cooled state, grind and soften the curved surface of the reinforced solid with curved surface to make it a smooth curved surface.

[0042] In this invention, the method for reinforcing steel pipe joints is based on arc wire additive manufacturing technology. Arc wire additive manufacturing involves directly depositing molten welding wire onto the surface to be reinforced. Welding materials can be deposited on existing pipe joint structures, with molten metal deposited on the substrate surface or an earlier deposition layer. This allows for reinforcement of various angles of existing pipe joint structures, even in overhead welding. Because the additive layer material and the substrate surface are metallurgically bonded, the joint has excellent load-bearing capacity. In some embodiments, the area to be reinforced includes the additive range extending axially and radially from the connection point between the branch pipe and the main pipe, respectively. The maximum extension length is defined as l0, where l0 is 0.5-1 times the outer diameter of the branch pipe. Furthermore, the radial extension of the additive range from the connection point between the branch pipe and the main pipe does not exceed the side of the main pipe. The outer diameter of a round steel pipe refers to the diameter of its outer wall, and the outer diameter of a square steel pipe refers to the side length of its outer wall. Furthermore, the area to be reinforced by additive manufacturing includes the additive range extending along the axial direction of the branch pipe at the connection position between the main pipe and the branch pipe, and the length of its extension is the same as the length of the area to be reinforced by additive manufacturing extending along the axial direction of the main pipe.

[0043] The stress analysis results of the pipe joint were obtained through finite element numerical analysis, and the areas of stress and strain concentration were as follows: Figure 2 As shown, the stress is mainly concentrated in the weld at the connection between the branch pipe wall and the main pipe wall. Because the stress and strain concentration is relatively high at the pipe joint within the range of 0.5-1.0 times the outer diameter of the branch pipe, the maximum length of the additive manufacturing process is determined to be within this range. Simultaneously, the area to be reinforced by additive manufacturing is rounded, and this rounded additive design is also determined based on the distribution of hot-spot stress at the pipe joint, effectively reducing the stress and strain concentration at the pipe joint.

[0044] The following examples, using square steel pipe nodes and round steel pipe nodes as specific embodiments, illustrate the method of reinforcing steel pipe nodes based on arc-fused wire additive manufacturing technology of the present invention.

[0045] Example 1

[0046] Reference Figure 3 A structural schematic diagram of the square steel pipe joint before reinforcement is shown. In this embodiment, the first square steel pipe component 11 and the second square steel pipe component 21 are welded together to form an intersecting square steel pipe joint. The first square steel pipe component 11 serves as a branch pipe, and the second square steel pipe component 21 serves as the main pipe. The reinforcement object is the square steel pipe joint; the main pipe dimensions are 100 mm × 100 mm × 5 mm, the branch pipe dimensions are 40 mm × 40 mm × 4 mm, and the angle between the main pipe and the branch pipe is 90°.

[0047] The above-mentioned method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology is used to improve stress and strain concentration at steel pipe joints. The specific steps include:

[0048] Step S1: Predict the stress and strain concentration of the steel pipe joint. Based on the cross-sectional dimensions of the branch pipe (40 mm × 40 mm × 4 mm), determine the range of the area to be reinforced by additives to be 30 mm.

[0049] The area to be reinforced by additive manufacturing includes the additive range extending axially and radially along the connection point of the first square steel tube component 11 and the second square steel tube component 21, respectively. The maximum extension length l0 is 30mm. Specific dimensions for the arc fuse additive manufacturing can be found by referring to... Figure 4 Furthermore, the maximum range of the additive manufacturing process extending radially along the second square steel pipe component 21 from the connection position of the first square steel pipe component 11 and the second square steel pipe component 21 shall not exceed the side surface of the second square steel pipe component 21. Here, the side surface of the second square steel pipe component 21 refers to the outer side surface of the side wall of the second square steel pipe component 21.

[0050] The area to be reinforced by additives includes the additive range extending along the axial direction of the first square steel pipe component 11 from the connection position between the second square steel pipe component 21 and the first square steel pipe component 11. The length of this extension is the same as the length of the area to be reinforced by additives extending along the axial direction of the second square steel pipe component 21.

[0051] Step S2: Clean the area to be reinforced on the surface of the steel pipe component, removing the protective layer and oxide layer from the surface of the steel pipe component. The cleaning operation includes: before adding material, first use acetone to remove oil, sewage and other impurities from the surface of the steel pipe at the steel pipe joint, and use a stainless steel wire brush to remove the protective layer and oxide film from the surface of the steel pipe at the steel pipe joint.

[0052] Step S3: Using arc wire additive manufacturing technology, arc wire additive printing is performed along an S-shaped trajectory in the area to be reinforced on the surface of the steel pipe component. Then, the metal additive is printed layer by layer to form the first reinforced entity 31 with an arc surface, thereby reinforcing the steel pipe node through additive manufacturing.

[0053] It should be noted that after completing the additive printing of one layer, the welding torch head is raised, and then the scanning and printing path of each layer is completed layer by layer, finally forming the first reinforced entity 31 with an arc surface of metal additive. Among them, the printing direction is from the connection position between the branch pipe and the main pipe along the axial direction of the branch pipe, that is, printing layer by layer along the axial direction of the first square steel pipe component 11.

[0054] After the square steel pipe joint is processed in step S3, as follows: Figure 4 As shown.

[0055] Step S4: Cool the first reinforced entity 31 with an arc surface after additive manufacturing reinforcement. In the fully cooled state, grind and soften the arc surface of the reinforced entity with an arc surface to make it a smooth curved surface.

[0056] In this embodiment, the arc wire additive manufacturing technology is a cold metal transfer (CMT) arc wire additive manufacturing process. The process parameters used in the arc wire additive manufacturing technology are: welding current of 130~150A, welding voltage of 16~18V, welding speed of 0.5~0.6m / min, and wire feed speed of 5.5~6.5m / min.

[0057] In this embodiment, a multi-layer additive manufacturing process is adopted in the process of additive manufacturing reinforcement. The thickness of each additive manufacturing reinforcement layer is 2.0~3.0mm, and the additive layer material is metal wire with the same material and strength as the steel pipe node.

[0058] Example 2

[0059] Reference Figure 5 A structural schematic diagram of the circular steel pipe node before reinforcement is shown. In this embodiment, the first circular steel pipe component 12 and the second circular steel pipe component 22 are welded together to form an intersecting node. The first circular steel pipe component 12 serves as a branch pipe, and the second circular steel pipe component 22 serves as the main pipe. The reinforcement object is the circular steel pipe node; the main pipe has dimensions of φ203×6mm, the branch pipe has dimensions of φ140×6mm, and the angle between the main pipe and the branch pipe is 90°.

[0060] The above-mentioned method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology is used to improve stress and strain concentration at steel pipe joints, and includes the following steps:

[0061] Step S1: Predict the stress and strain concentration of the steel pipe joint. Based on the cross-sectional dimensions of the branch pipe φ140×6mm, determine the range of the area to be reinforced by the additive manufacturing process to be 70mm.

[0062] The area to be reinforced by additive manufacturing includes the additive range extending axially and radially along the connection point of the first circular steel pipe component 12 and the second circular steel pipe component 22, respectively. The maximum extension length l0 is 70mm. Specific dimensions for the arc fuse additive manufacturing can be found by referring to… Figure 6 Furthermore, the maximum extent of the additive manufacturing process extending radially from the connection point between the first round steel pipe component 12 and the second round steel pipe component 22 shall not exceed the side surface of the second round steel pipe component 22, where the side surface of the second round steel pipe component 22 refers to the outer perimeter of the second round steel pipe component 22.

[0063] The area to be reinforced by additive manufacturing includes the additive range extending along the axial direction of the first round steel pipe component 12 from the connection position between the second round steel pipe component 22 and the first round steel pipe component 12. The length of this extension is the same as the length of the area to be reinforced by additive manufacturing along the axial direction of the second round steel pipe component 22.

[0064] Step S2: Clean the area to be reinforced on the surface of the steel pipe component, removing the protective layer and oxide layer from the surface of the steel pipe component. The cleaning operation includes: before adding material, first use acetone to remove oil, sewage and other impurities from the surface of the steel pipe at the steel pipe joint, and use a stainless steel wire brush to remove the protective layer and oxide film from the surface of the steel pipe at the steel pipe joint.

[0065] Step S3: Using arc wire additive manufacturing technology, arc wire additive printing is performed along an S-shaped trajectory in the area to be reinforced on the surface of the steel pipe component. Then, layer by layer, a second reinforced entity 32 with an arc surface of metal additive is formed, thereby reinforcing the steel pipe node through additive manufacturing.

[0066] It should be noted that after completing the additive printing of one layer, the welding torch head is raised, and then the scanning and printing path of each layer is completed layer by layer, finally forming the second reinforced entity 32 with an arc surface of metal additive. Among them, the printing direction is from the connection position between the branch pipe and the main pipe along the axial direction of the branch pipe, that is, printing layer by layer along the axial direction of the first component 12 of the round steel pipe.

[0067] After the circular steel pipe node is processed in step S3, as follows: Figure 6 As shown.

[0068] Step S4: Cool the second reinforced entity 32 with an arc surface after additive manufacturing reinforcement. In the fully cooled state, grind and soften the arc surface of the reinforced entity with an arc surface to make it a smooth curved surface.

[0069] In this embodiment, the arc wire additive manufacturing technology is a cold metal transfer (CMT) arc wire additive manufacturing process. The process parameters used in the arc wire additive manufacturing technology are: welding current of 130~150A, welding voltage of 16~18V, welding speed of 0.5~0.6m / min, and wire feed speed of 5.5~6.5m / min.

[0070] In this embodiment, a multi-layer additive manufacturing process is adopted in the process of additive manufacturing reinforcement. The thickness of each additive manufacturing reinforcement layer is 2.0~3.0mm, and the additive layer material is metal wire with the same material and strength as the steel pipe node.

[0071] Arc welding wire additive manufacturing technology is a direct energy deposition technology using welding wire as raw material. Under the control of a set program, it can deposit molten metal on the surface of the substrate or on an earlier deposition layer according to a preset path. Currently, arc welding wire additive manufacturing technology has not been used to reinforce pipe joints.

[0072] Arc-fused wire additive manufacturing technology has the following main advantages:

[0073] (1) The electric arc wire additive manufacturing technology adopts a layer-by-layer stacking printing method to design any form of metal additive entity to reinforce the pipe node. The amount of material used can be increased or decreased in the high stress and low stress parts of the structure, which greatly improves the material utilization rate.

[0074] (2) Arc wire additive manufacturing technology can significantly reduce local stress and strain concentration by achieving arc-shaped additive design at the node, thus ensuring that the node has good stress performance.

[0075] (3) Compared with other direct energy deposition technologies, the cost of arc wire additive manufacturing technology is relatively low. Due to its high deposition rate, it can effectively improve production efficiency and shorten the production cycle.

[0076] This invention employs the aforementioned method for reinforcing steel pipe joints based on arc-fused-wire additive manufacturing technology. By progressively stacking layers of arbitrarily designed metal additive entities using this technology, the steel pipe joint is reinforced, thereby improving its load-bearing capacity. Simultaneously, the arc-shaped additive form significantly reduces local stress and strain concentration at the joint, ensuring excellent load-bearing performance. It is estimated that the stress and strain concentration at the reinforced steel pipe joint will decrease by 40-50%. This method not only improves the load-bearing capacity of the steel pipe joint but also significantly reduces local stress and strain concentration, resulting in high material utilization. Furthermore, the additive layer material and the substrate surface are metallurgically bonded, ensuring excellent load-bearing performance of the joint.

[0077] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for reinforcing steel pipe joints based on arc-fused-wire additive manufacturing technology, characterized in that, Includes the following steps: Step S1: Predict the stress and strain concentration at the steel pipe joint and determine the area to be reinforced by additive manufacturing based on the dimensions of the steel pipe component. The steel pipe joint is the connection area where the branch pipe connects to the main pipe. The area to be reinforced by additive manufacturing includes the additive range extending axially and radially from the connection point between the branch pipe and the main pipe, respectively. The maximum length of this extension is defined as l0, where l0 is 0.5-1 times the outer diameter of the branch pipe. Furthermore, the maximum length of the additive range extending radially from the connection point between the branch pipe and the main pipe does not exceed the side of the main pipe. The area to be reinforced by additive manufacturing also includes the additive range extending axially from the connection point between the main pipe and the branch pipe, with the same length as the area to be reinforced by additive manufacturing extending axially from the main pipe. Step S2: Clean the area to be reinforced on the surface of the steel pipe component, and remove the protective layer and oxide layer on the surface of the steel pipe component; Step S3: Using arc wire additive manufacturing technology, arc wire additive printing is performed along an S-shaped trajectory in the area to be reinforced on the surface of the steel pipe component. Layer by layer, an arc-shaped reinforced metal additive body is formed, thereby reinforcing the steel pipe node through additive manufacturing. During the additive manufacturing reinforcement process, a multi-layer additive manufacturing process is adopted, and the thickness of each additive manufacturing reinforcement layer is 2.0~3.0mm. Step S4: Cool the reinforced entity with curved surface after additive manufacturing. In the fully cooled state, grind and soften the curved surface of the reinforced entity with curved surface to make it a smooth curved surface.

2. The method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to claim 1, characterized in that: The steel pipe joint is either a round steel pipe joint or a square steel pipe joint.

3. The method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to claim 1, characterized in that: The steel pipe joint is a T-type joint, a Y-type joint, or a K-type joint.

4. The method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to claim 1, characterized in that, The cleaning operation in step S2 includes: first, using acetone to remove impurities from the surface of the steel pipe at the steel pipe joint before additive manufacturing, and then using a wire brush to remove the protective layer and oxide film from the surface of the steel pipe at the steel pipe joint.

5. The method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to claim 1, characterized in that: In step S3, a multi-axis robotic arm is used to adjust the position of the welding torch head during arc wire additive manufacturing.

6. The method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to claim 1, characterized in that, In step S3, the arc wire additive manufacturing technology is a cold metal transition arc wire additive manufacturing process. The process parameters used in the arc wire additive manufacturing technology are: welding current of 130-150A, welding voltage of 16-18V, welding speed of 0.5-0.6m / min, and wire feeding speed of 5.5-6.5m / min.

7. The method for reinforcing steel pipe joints based on arc-fused wire additive manufacturing technology according to claim 1, characterized in that: In step S3, during the additive manufacturing reinforcement process, the additive layer material is a metal wire with the same material and strength as the steel pipe node.

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