Welding method and positioning device

Abstract

The present application relates to the technical field of welding, and discloses a welding method and a positioning device, wherein the welding method is used for welding a grid disc positioned by the positioning device, and the welding method comprises the following steps: spot welding, and then full welding after turning over, so that the welding stress is reduced, and the welding quality of the grid disc is improved. The positioning device comprises a supporting device and a positioning device, the supporting device is configured to support the grid disc, the positioning device comprises a first positioning mechanism, a second positioning mechanism and a third positioning mechanism arranged on the supporting device, the first mechanism is configured to position a back-shaped frame body, the second positioning mechanism is configured to position a first pipe, and the third positioning mechanism is configured to position a second pipe, and the first positioning mechanism, the second positioning mechanism and the third positioning mechanism are respectively adjustable in position with the supporting device. Through the above arrangement, the grid disc is positioned, so that before the grid disc is welded, a user can quickly find the position of the steel pipe according to the above structure, the quick positioning of the grid disc is realized, and the welding speed of the grid disc is improved.

Description

[0001] This application is a divisional application of patent application number 2022112639792 (the original application was filed on October 17, 2022, and the invention was entitled "Positioning Device and Welding Method"). Technical Field

[0002] This invention belongs to the field of welding technology, and specifically relates to a welding method and a positioning device. Background Technology

[0003] A grid is a type of carrier made of steel pipes welded together in a cross pattern. Before welding, existing grids are made by placing steel pipes of different lengths on a platform and splicing them together manually. The corresponding positions are then measured with a ruler or tape measure before welding.

[0004] When welding single or small quantities of steel pipes, the impact on welding efficiency and quality is minimal. However, in mass production, each pipe requires manual assembly and welding after measuring the corresponding positions with a ruler or tape measure, resulting in low work efficiency. Furthermore, during the welding process, the grid is prone to deformation due to welding stress contraction, compromising the quality of the welded grid and further reducing welding efficiency. In addition, arbitrary welding sequences can lead to uneven stress within the grid, increasing its deformation.

[0005] Therefore, there is an urgent need to design a welding method and positioning equipment to solve the problems of low welding efficiency and welding stress deformation. Summary of the Invention

[0006] One object of the present invention is to provide a welding method that can reduce the internal stress of the welded grid disk and reduce the deformation of the grid disk.

[0007] Another objective of this invention is to provide a positioning device that can accelerate the positioning process of welded steel pipes, thereby increasing the welding speed.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A welding method for welding a grid disk, wherein the grid disk includes a loop-shaped frame, a first tube and a second tube, the first tube and the second tube are arranged intersectingly and are both located in the loop-shaped frame, and both ends of the first tube and both ends of the second tube are connected to the loop-shaped frame.

[0010] The tube to be welded to the aforementioned grid is a square tube, with the turning points at both ends of the square tube being inflection points. The aforementioned second tube is composed of multiple sub-tubes, which are arranged between two adjacent aforementioned first tubes or between the aforementioned U-shaped frame and the aforementioned first tubes. As a preferred embodiment, the following steps are included:

[0011] S1: Position the U-shaped frame, the first tube, and the second tube, with the initial face of the grid disk facing upwards;

[0012] S2: Spot weld the joints of the pipes connected to the above-mentioned U-shaped frame;

[0013] S3: Spot weld the four inflection points at both ends of the first tube upward to the loop frame, and spot weld the four inflection points at both ends of the sub-tube upward to the loop frame or to the first tube.

[0014] S4: Flip the above-mentioned grid disk over and perform full soldering on the other side of the above-mentioned grid disk.

[0015] As a preferred embodiment, the first pipe includes a first end and a second end, the first end and the second end being welded to the U-shaped frame respectively, the two inflection points of the first end being the first weld point group, and the two inflection points of the second end being the second weld point group, wherein S3 includes:

[0016] S31: Select one point from the first welding point group above and perform spot welding;

[0017] S32: Select one point from the second welding point group above for spot welding:

[0018] S33: Select any one of the remaining two inflection points mentioned above for spot welding;

[0019] S34: Spot weld the last of the four points; the welding sequence of the four inflection points of the above-mentioned sub-tube is the same as the welding sequence of the four inflection points of the above-mentioned first tube.

[0020] As a preferred embodiment, S2 specifically involves spot welding at the middle of the outermost connecting line of the pipes connected to the aforementioned loop frame.

[0021] A positioning device for positioning a grid disk manufactured by the above welding method, the positioning device comprising:

[0022] A support device is configured to support the aforementioned grid disk; and

[0023] The positioning device includes a first positioning mechanism, a second positioning mechanism, and a third positioning mechanism disposed on the support device. The first positioning mechanism is configured to position the U-shaped frame, the second positioning mechanism is configured to position the first tube, and the third positioning mechanism is configured to position the second tube. The positions of the first positioning mechanism, the second positioning mechanism, and the third positioning mechanism relative to the support device are adjustable.

[0024] As a preferred embodiment, the first positioning mechanism includes a first positioning component and a second positioning component. At least two of the first positioning components are arranged on the outer side of each tube of the loop frame, and at least two of the second positioning components are arranged on the inner side of each tube of the loop frame.

[0025] As a preferred embodiment, the first positioning component and the second positioning component are staggered along their length.

[0026] As a preferred embodiment, the second positioning mechanism includes a third positioning component, which is attached to one side of the first tube; the third positioning mechanism includes a fourth positioning component, which is attached to one side of the second tube.

[0027] As a preferred embodiment, the third positioning components arranged on the sides of the plurality of first pipes are located on the same side of the respective first pipes, and the fourth positioning components arranged on the sides of the plurality of sub-pipes are located on the same side of the respective sub-pipes.

[0028] As a preferred embodiment, the aforementioned support device includes multiple guide members arranged side-by-side in sequence, with a guide gap formed between the tops of adjacent guide members. The first positioning mechanism includes a first positioning component and a second positioning component, the second positioning mechanism includes a third positioning component, and the third positioning mechanism includes a fourth positioning component. All three positioning components (first, second, third, and fourth) are capable of sliding along the guide gap. The first, second, third, and fourth positioning components have identical structures. The first positioning component includes:

[0029] The positioning component is a U-shaped structure and is mounted on two adjacent guide components. The frame of the positioning component is rectangular, and through holes are provided on the positioning component.

[0030] A screw, the threaded end of which passes sequentially through the guide gap and the through hole; and

[0031] The nut is threadedly connected to the screw and can fix the positioning element to the guide element.

[0032] As a preferred option, the aforementioned via is an oblong hole.

[0033] The beneficial effects of this invention are as follows:

[0034] This invention provides a welding method in which, after positioning using the aforementioned positioning device, the U-shaped frame is first spot-welded, and then the first tube and sub-tube in the middle are spot-welded, so that one side of the grid is spot-welded first. At this time, the entire grid is connected and the stress is very small. Then, the other side is flipped over for full welding, so that the welding stress on both sides is relatively balanced. In the whole process, the welding stress is reduced to the greatest extent and the welding quality of the grid is improved.

[0035] This invention provides a positioning device that uses a first positioning mechanism, a second positioning mechanism, and a third positioning mechanism to position various parts of a grid disk. This allows the user to quickly locate the steel pipe before welding the grid disk by using the positions of the first, second, and third positioning mechanisms, thus achieving rapid positioning of the grid disk and improving the welding speed of the grid disk. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the grid disk structure provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the positioning device provided in this embodiment of the invention, which positions the grid disk on the support device. Figure 1 ;

[0038] Figure 3 This is a schematic diagram of the positioning device provided in this embodiment of the invention, which positions the grid disk on the support device. Figure 2 ;

[0039] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0040] Figure 5 This is a cross-sectional view of the first positioning component provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the first pipe spot welding provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of spot welding of a loop-shaped frame provided in an embodiment of the present invention.

[0043] In the picture:

[0044] 10. Support device; 11. Guide component; 12. Guide clearance; 13. Support platform;

[0045] 20. Positioning device;

[0046] 21. First positioning mechanism; 211. First positioning assembly; 2111. Positioning element; 21111. Through hole; 2112. Screw; 2113. Nut; 212. Second positioning assembly;

[0047] 22. Second positioning mechanism; 221. Third positioning component;

[0048] 23. Third positioning mechanism; 231. Fourth positioning component;

[0049] 300, grid plate; 310, first tube; 311, first end; 3111, first welding point group; 31111, first point; 31112, second point; 312, second end; 3121, second welding point group; 31211, third point; 31212, fourth point; 320, second tube; 321, sub-tube; 330, U-shaped frame; 331, fifth point. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0054] A grid is a type of carrier made of steel pipes welded together in a crisscross pattern. Currently, before welding, steel pipes of different lengths are placed on a platform and manually assembled. The corresponding positions are then measured using a ruler or tape measure before welding. For example... Figure 1 As shown, the grid disk 300 includes a U-shaped frame 330, a first tube 310, and a second tube 320. The first tube 310 and the second tube 320 are arranged intersectingly and are both located within the U-shaped frame 330. Both ends of the first tube 310 and both ends of the second tube 320 are connected to the U-shaped frame 330. To maintain the flatness of the grid disk 300, the second tube 320 is composed of multiple sub-tubes 321. The sub-tubes 321 are arranged between two adjacent first tubes 310 or between the U-shaped frame 330 and the first tubes 310. It can be understood that each sub-tube 321 can exist independently. Due to the large number of tubes, during mass production of the grid disk 300, manual positioning often results in slow positioning speed or inaccurate positioning dimensions, leading to poor consistency of the finished grid disk 300 and low welding efficiency.

[0055] To solve the above problems, such as Figure 2As shown, this embodiment provides a positioning device including a support device 10 and a positioning device 20. The support device 10 is configured to support a grid disk 300. The positioning device 20 includes a first positioning mechanism 21, a second positioning mechanism 22, and a third positioning mechanism 23 disposed on the support device 10. The first positioning mechanism 21 is configured to position a U-shaped frame 330, the second positioning mechanism 22 is configured to position a first tube 310, and the third positioning mechanism 23 is configured to position a second tube 320. The positions of the first positioning mechanism 21, the second positioning mechanism 22, and the third positioning mechanism 23 relative to the support device 10 are adjustable. When using this positioning device, first, a grid plate 300 is manually welded according to the drawings. This grid plate 300 serves as the reference for the positions of the first positioning mechanism 21, the second positioning mechanism 22, and the third positioning mechanism 23. First, the pre-welded grid plate 300 is placed on the support device 10. Then, the positions of the first positioning mechanism 21, the second positioning mechanism 22, and the third positioning mechanism 23 are adjusted so that the first positioning mechanism 21 is in contact with the U-shaped frame 330, the second positioning mechanism 22 is in contact with the first tube 310, and the third positioning mechanism 23 is in contact with the second tube 320. Here, each sub-tube 321 needs to be in contact with the third positioning mechanism 23. Then, the standard grid plate 300 is removed. When making the grid plate 300 again, each tube of the U-shaped frame 330 is connected to the first positioning mechanism 21 in turn, then the first tube 310 is connected to the second positioning mechanism 22, and finally the second tube 320 is connected to the third positioning mechanism 23. After all the positions of the steel tubes are determined, welding can begin. The positioning of each part of the grid disk 300 is achieved by setting the first positioning mechanism 21, the second positioning mechanism 22 and the third positioning mechanism 23. This allows the user to quickly locate the position of the steel pipe before welding the grid disk 300, thereby achieving rapid positioning of the grid disk 300 and improving the welding speed of the grid disk 300.

[0056] Preferably, such as Figure 2 As shown, the first positioning mechanism 21 includes a first positioning component 211 and a second positioning component 212. The second positioning component 212 and the first positioning component 211 are respectively provided on the inner and outer sides of each tube of the U-shaped frame 330. That is, the second positioning component 212 and the first positioning component 211 are closely arranged on the inner and outer sides of each tube of the U-shaped frame 330, so that each tube of the U-shaped frame 330 is clamped, thereby improving the positioning stability of the U-shaped frame 330 and thus better preventing the deformation of the U-shaped frame 330 after welding.

[0057] Preferably, at least two second positioning components 212 are arranged on the inner side of each tube of the U-shaped frame 330, and at least two first positioning components 211 are arranged on the outer side of each tube of the U-shaped frame 330. With the above arrangement, on the basis of clamping each tube of the U-shaped frame 330, since each tube of the U-shaped frame 330 is relatively long, the above arrangement can, on the one hand, prevent each tube of the U-shaped frame 330 from being accidentally touched and moving during positioning, ensuring the uniqueness of the well-positioned U-shaped frame 330; on the other hand, it can prevent the U-shaped frame 330 from deforming after welding.

[0058] Preferably, such as Figure 2 As shown, each tube of the U-shaped frame 330 has a first positioning component 211 at both ends of its outer side. During welding of the U-shaped frame 330, stress contraction often causes the tube to deform and shrink, manifesting externally as a concave middle and outward-curving ends. The aforementioned arrangement uses a second positioning component 212 to limit the curvature force at both ends of the tube, preventing deformation and ensuring the appearance quality of the U-shaped frame 330. Preferably, the first positioning components 211 and the second positioning components 212 are staggered along their length, which helps to limit the welding stress of each tube in the U-shaped frame 330, resulting in a uniform distribution of welding stress. In this embodiment, two first positioning components 211 are located at both ends of the outer side of each tube, and two second positioning components 212 are located at the middle of the inner side of each tube. In other embodiments, multiple second positioning components 212 may be provided, which is not limited here.

[0059] Preferably, such as Figure 2 As shown, the second positioning mechanism 22 includes a third positioning component 221, which is attached to one side of the first tube 310. The third positioning mechanism 23 includes a fourth positioning component 231, which is attached to one side of the second tube 320. Because the U-shaped frame 330 is clamped during positioning, if both the first tube 310 and the second tube 320 are clamped during part removal after welding, a large clamping force must be overcome to remove the grid plate 300 due to the large number of tubes, which may also cause deformation of the grid plate 300. The above-mentioned design ensures that the tubes inside the U-shaped frame 330 are not subjected to clamping force while maintaining the shape of the grid plate 300, thus making part removal from the grid plate 300 smoother.

[0060] Preferably, at least two third positioning components 221 are arranged on one side of the first tube 310 to prevent the first tube 310 from rotating around a third positioning component 221 during the positioning process. Optionally, at least one fourth positioning component 231 is arranged close to one side of each sub-tube 321. Since the sub-tube 321 is relatively short and its two ends can abut against the U-shaped frame 330 or the first tube 310, setting one fourth positioning component 231 can ensure a good positioning effect for the sub-tube 321, and the above arrangement prevents the positioning components from being arranged too densely.

[0061] Furthermore, such as Figure 2 As shown, the third positioning components 221 arranged on the sides of multiple first tubes 310 are located on the same side of the corresponding first tubes 310, and the fourth positioning components 231 arranged on the sides of multiple sub-tubes 321 are located on the same side of the corresponding sub-tubes 321. The above arrangement can make the force direction of all first tubes 310 and all sub-tubes 321 uniform, and minimize the generation of clamping force that would cause inconvenience in picking up parts.

[0062] Optionally, such as Figure 3 As shown, the support device 10 includes multiple guide members 11 arranged side by side. A guide gap 12 is formed between the tops of adjacent guide members 11. The first positioning component 211, the second positioning component 212, the third positioning component 221, and the fourth positioning component 231 can all slide along the guide gap 12. This arrangement allows the first positioning mechanism 21, the second positioning mechanism 22, and the third positioning mechanism 23 to be adjustable relative to the support device 10. Optionally, the support device 10 also includes a support platform 13, on which the multiple guide members 11 are disposed. The support platform 13 allows for easier operation of the work surface. In this embodiment, the guide members 11 are I-beams, spaced apart to form the guide gap 12. An installation space is formed between two I-beams at both ends along the length of the I-beam, facilitating the installation and insertion of the first positioning component 211, the second positioning component 212, the third positioning component 221, and the fourth positioning component 231 from the ends. Here, it is preferable that the width of the guide gap 12 is smaller than the width of the steel pipe to prevent the steel pipe from getting stuck in the guide gap 12. In other embodiments, the guide member 11 can also be integral, as long as it has guide gaps 12 for adjusting each positioning component, which is not limited here.

[0063] The following is combined Figure 2 and Figure 3 The tube positioning sequence of the grid disk 300 is described.

[0064] like Figure 2 and Figure 3As shown, the handmade standard grid plate 300 is placed on multiple support devices 10. The positions of the first positioning component 211 and the second positioning component 212 are adjusted on the corresponding guide gap 12 so that they abut against the inner and outer sides of the grid plate 300 template, respectively. Then, the position of the third positioning component 221 is adjusted on the corresponding guide gap 12 so that it abuts against the first tube 310. Finally, the position of the fourth positioning component 231 is adjusted on the corresponding guide gap 12 so that it abuts against the sub-tube 321. The standard grid plate 300 is then removed. Each tube of the U-shaped frame 330 is then pressed against the corresponding first positioning component 211 and the second positioning component 212. Then, the first tube 310 is pressed against the corresponding third positioning component 221. Finally, each sub-tube 321 is pressed against the corresponding fourth positioning component 231. The above completes the positioning work of the entire grid plate 300 before welding.

[0065] Optionally, the first positioning component 211, the second positioning component 212, the third positioning component 221, and the fourth positioning component 231 have the same structure, which will be discussed below. Figure 4 and Figure 5 The structure of the first positioning component 211 is described below. Figure 4 and Figure 5 As shown, the first positioning component 211 includes a positioning element 2111 and a fixing element. The positioning element 2111 can slide along the guide gap 12, and the fixing element is used to fix the positioning element 2111 onto the guide element 11. The positioning element 2111 has a U-shaped structure and is mounted on two guide elements 11, with a rectangular outer edge. This configuration ensures that the positioning element 2111 has a certain length at both ends of the U-shaped structure and in the extending direction, allowing it to be positioned against the tube body in both directions. Furthermore, when the space inside the grid 300 for placing the positioning component is insufficient in one direction, a positioning component (hereinafter referred to as the first positioning component 211, the second positioning component 212, the third positioning component 221, and the fourth positioning component 231) can be selectively installed to adapt to the limited installation space. See also... Figure 2 The positioning component 2111 can have various specifications. For example, if there is no limitation on the installation space on the outside of the U-shaped frame 330, a slightly larger positioning component 2111 can be used for positioning. If there is insufficient space for the internal positioning component, the end of the positioning component 2111 can be used for positioning, and if there is sufficient space, the long side can be used for positioning.

[0066] Optionally, the positioning component 2111 has a through hole 21111, and the fixing components include a screw 2112 and a nut 2113. The threaded end of the screw 2112 passes through the guide gap 12 and the through hole 21111 in sequence. The nut 2113 is threadedly connected to the screw 2112 and can fix the positioning component 2111 to the guide component 11. Based on the above configuration, when the user adjusts the position of the positioning component, he / she loosens the nut 2113 and slides or rotates the positioning component to adjust its position. After the position of the positioning component is adjusted to the correct position, he / she tightens the nut 2113 so that the positioning component 2111, which is sandwiched between the head of the nut 2113 and the screw 2112, abuts against the guide component 11, thereby fixing the positioning component 2111. This method is simple and convenient to operate. In other embodiments, other fixing methods may also be used, which are not limited here.

[0067] Preferably, the through hole 21111 is an elongated hole, which allows the position of the positioning member 2111 to be finely adjusted when the nut 2113 is inserted into a certain guide gap 12, without having to remove the positioning member 2111 from the guide member 11 and move it to another guide gap 12, making the determination of the position of the positioning component more flexible.

[0068] In the existing technology, during the welding of steel pipes, the grid disk 300 is prone to deformation due to welding stress shrinkage, which cannot guarantee the quality of the grid disk 300 after welding. In addition, arbitrary welding sequence can also lead to uneven stress inside the grid disk 300, increasing the amount of deformation of the grid disk 300.

[0069] To solve the above problems, such as Figure 1 and Figure 6 As shown, this embodiment provides a welding method for welding square tubes into a grid 300. The welding method includes the following steps: S1: Using the positioning device, the U-shaped frame 330, the first tube 310, and the second tube 320 are positioned. At this time, the upward-facing surface of the grid 300 is the initial surface; S2: Spot welding is performed on the tubes connected to the U-shaped frame 330; S3: Spot welding is performed on the four upward-facing corners of the first tube 310 to the U-shaped frame 330 and on the four upward-facing corners of the sub-tube 321 to the U-shaped frame 330 or to the first tube 310; S4: The grid 300 is flipped over, and the other side of the grid 300 is fully welded; S5: The grid 300 is flipped back, and the initial surface is fully welded. After positioning using the aforementioned positioning device, the U-shaped frame 330 is first spot-welded, and then the first tube 310 and the second tube 320 in the middle are spot-welded, so that one side of the grid disk 300 is spot-welded first. At this time, the entire grid disk 300 is connected and the stress is very small. Then, the other side is flipped over for full welding, so that the welding stress on the two sides is relatively balanced. Then, the initial side is fully welded, so that the whole is welded in place. In the whole process, the welding stress is minimized and the welding quality of the grid disk 300 is improved.

[0070] The following is combined Figure 6 The welding sequence of the four upward-facing inflection points of the first pipe 310 or the four upward-facing inflection points of the sub-pipe 321 is explained. Taking the first pipe 310 as an example, the first pipe 310 includes a first end 311 and a second end 312. The first end 311 and the second end 312 are welded to the U-shaped frame 330. The two inflection points of the first end 311 at the top are the first welding point group 3111, and the two inflection points of the second end 312 at the top are the second welding point group 3121. S3 includes: S31: Select one point from the first welding point group 3111 for spot welding; S32: Select one point from the second welding point group 3121 for spot welding; S33: Select any one of the remaining two welding points for spot welding; S34: Spot weld the last point among the four points. Therefore, when welding the square tube, the operator performs spot welding at both ends of the tube. This results in lower welding stress and relatively balanced stress at both ends, achieving the goal of rough welding the square tube. This prevents stress concentration at one end after welding the entire tube, which could lead to excessive deformation at the other end. Welding the other end would then cause excessive stress throughout the entire square tube. Furthermore, spot welding is used to avoid generating excessive stress on the initial surface of the grid 300, which could lead to excessive deformation of the initial surface. Specifically, as... Figure 6 As shown, the first welding point group 3111 includes a first point 31111 and a second point 31112, and the second welding point group 3121 includes a third point 31211 and a fourth point 31212. The first point 31111, the second point 31112, the third point 31211, and the fourth point 31212 all need to be spot-welded to the U-shaped frame 330. The welding sequence of the above four points can be: first point 31111, third point 31211, second point 31112, fourth point 31212; first point 31111, third point 31211, fourth point 31212, second point 31112; first point 31111... The welding sequences are as follows: 4. Point 31212, 3.1211, 2. 3.1112; 1. Point 31111, 4. 3.1212, 2. 3.1112, 3.1211, 4. 3.1212, 1. 3.1111; 2. 3.1112, 3.1211, 1. 3.1111, 4. 3.1212; 2. 3.1112, 4. 3.1212, 1. 3.1111, 3.1211; or 2. 3.1112, 4. 3.1212, 3.1211, 1. 3.1111. All eight welding sequences are acceptable.

[0071] Optionally, such as Figure 7 As shown, S2 specifically involves spot welding at the middle of the outermost connecting line of the pipe connected to the loop frame 330, i.e., the fifth point 331 in the figure, to balance the welding stress on the upper and lower surfaces of the loop frame 330.

[0072] Obviously, the embodiments of the present invention are merely examples for clearly illustrating the invention, and are not intended to limit the implementation of the invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A welding method for welding a grid disk (300), the grid disk (300) comprising a U-shaped frame (330), a first tube (310) and a second tube (320), the first tube (310) and the second tube (320) being arranged crosswise and both located in the U-shaped frame (330), both ends of the first tube (310) and both ends of the second tube (320) being connected to the U-shaped frame (330); The tube to be welded in the grid disk (300) is a square tube, with the turning points at both ends of the square tube being inflection points. The second tube (320) is composed of multiple sub-tubes (321), and the sub-tubes (321) are arranged between two adjacent first tubes (310) or between the U-shaped frame (330) and the first tubes (310). The characteristic of this design is that... Includes the following steps: S1: Position the spiral frame (330), the first tube (310), and the second tube (320), with the grid disk (300) initially facing upwards; S2: Spot weld the connection points of the pipes connected to the spiral frame (330); S3: Spot weld the four upward-facing inflection points of the first tube (310) to the loop frame (330), and spot weld the four upward-facing inflection points of the sub-tube (321) to the loop frame (330) or to the first tube (310). S4: Flip the grid disk (300) over and perform full soldering on the other side of the grid disk (300).

2. The welding method according to claim 1, characterized in that, The first tube (310) includes a first end (311) and a second end (312). The first end (311) and the second end (312) are respectively welded to the U-shaped frame (330). The two inflection points of the first end (311) are the first welding point group (3111), and the two inflection points of the second end (312) are the second welding point group (3121). S3 includes: S31: Select one point from the first welding point group (3111) for spot welding; S32: Select one point from the second welding point group (3121) for spot welding: S33: Select any one of the remaining two inflection points for spot welding; S34: Spot weld the last of the four points; the welding sequence of the four inflection points of the sub-tube (321) is the same as the welding sequence of the four inflection points of the first tube (310).

3. The welding method according to claim 1, characterized in that, Specifically, S2 involves spot welding at the middle of the outermost connecting line of the pipe connected to the loop frame (330).

4. A positioning device, characterized in that, For positioning a grid disk (300) manufactured by the welding method as described in any one of claims 1-3, the positioning device comprises: Support device (10), configured to support the grid disk (300); and The positioning device (20) includes a first positioning mechanism (21), a second positioning mechanism (22), and a third positioning mechanism (23) disposed on the support device (10). The first positioning mechanism (21) is configured to position the U-shaped frame (330), the second positioning mechanism (22) is configured to position the first tube (310), and the third positioning mechanism (23) is configured to position the second tube (320). The positions of the first positioning mechanism (21), the second positioning mechanism (22), and the third positioning mechanism (23) relative to the support device (10) are adjustable.

5. The positioning device according to claim 4, characterized in that, The first positioning mechanism (21) includes a first positioning component (211) and a second positioning component (212). At least two of the first positioning components (211) are arranged on the outside of each tube of the spiral frame (330), and at least two of the second positioning components (212) are arranged on the inside of each tube of the spiral frame (330).

6. The positioning device according to claim 5, characterized in that, The first positioning component (211) and the second positioning component (212) are offset along their length.

7. The positioning device according to claim 5, characterized in that, The second positioning mechanism (22) includes a third positioning component (221), which is attached to one side of the first tube (310); the third positioning mechanism (23) includes a fourth positioning component (231), which is attached to one side of the second tube (320).

8. The positioning device according to claim 7, characterized in that, The third positioning components (221) arranged on the side of the plurality of first tubes (310) are located on the same side of the corresponding first tubes (310), and the fourth positioning components (231) arranged on the side of the plurality of sub-tubes (321) are located on the same side of the corresponding sub-tubes (321).

9. The positioning device according to claim 4, characterized in that, The support device (10) includes multiple guide members (11), which are arranged side by side in sequence. A guide gap (12) is formed between the tops of two adjacent guide members (11). The first positioning mechanism (21) includes a first positioning component (211) and a second positioning component (212). The second positioning mechanism (22) includes a third positioning component (221). The third positioning mechanism (23) includes a fourth positioning component (231). The first positioning component (211), the second positioning component (212), the third positioning component (221), and the fourth positioning component (231) can all slide along the guide gap (12). The first positioning component (211), the second positioning component (212), the third positioning component (221), and the fourth positioning component (231) have the same structure. The first positioning component (211) includes: The positioning component (2111) is a U-shaped structure and is mounted on two adjacent guide components (11). The frame of the positioning component (2111) is rectangular, and a through hole (21111) is provided on the positioning component (2111). A screw (2112), the threaded end of which passes sequentially through the guide gap (12) and the through hole (21111); and The nut (2113) is threaded to the screw (2112) and can fix the positioning member (2111) to the guide member (11).

10. The positioning device according to claim 9, characterized in that, The via (21111) is an oblong hole.

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