A turnover auxiliary device for welding H-shaped steel and a welding method of H-shaped steel

Abstract

The application relates to the technical field of steel structure welding, and particularly discloses a turnover auxiliary device for welding H-shaped steel and a welding method of H-shaped steel. The turnover auxiliary device for welding H-shaped steel comprises turnover mechanisms, both ends of the H-shaped steel to be welded are provided with the turnover mechanisms, the turnover mechanism comprises a roller and a turnover clamping assembly, the turnover clamping assembly is arranged in the roller and connected with the roller, at least one clamping positioning mechanism is arranged on the H-shaped steel to be welded, the clamping positioning mechanism is located between the two turnover mechanisms, and the clamping positioning mechanism is used for clamping and positioning the wing plates and the web plate of the H-shaped steel to be welded; and the clamping positioning mechanism comprises a pressing clamping assembly, both ends of the pressing clamping assembly are detachably provided with clamping vertical plates. The application has the advantages that the positioning precision, the production efficiency and the finished product quality of the H-shaped steel welding can be improved.

Description

Technical Field

[0001] This invention relates to the field of steel structure welding technology, and in particular to a flipping auxiliary device for welding H-beams and a welding method for H-beams. Background Technology

[0002] With the increasing scale of equipment in thermal power plants, refineries, and other fields, the requirements for the strength, thickness, and dimensions of steel structural materials used to support the equipment are constantly increasing. This places higher demands on the manufacturing processes and procedures for large or extra-large steel structural components. Producing large components to quality within a short manufacturing cycle has become a crucial guarantee for the timely commissioning of large thermal power plants and refineries. H-beams, as key supports for large equipment, are important load-bearing components, often bearing the weight of most equipment and components. They also withstand a certain amount of vibration during use and are not replaceable; their service life is typically the same as the natural lifespan of the equipment they support. Therefore, strict requirements are placed on their installation accuracy and load-bearing capacity during installation.

[0003] Due to their heavy load-bearing capacity, and given a fixed material, the corresponding components are large in size and weight, often requiring the use of low-alloy high-strength thick steel plates for welding. Therefore, ensuring overall manufacturing precision, reducing internal stress during manufacturing, and guaranteeing weld quality have become the key challenges and difficulties in producing qualified thick-plate welded H-beams.

[0004] Currently, the conventional process for welding H-beams using low-alloy high-strength thick steel plates is as follows: pre-assembly using auxiliary tooling, followed by fixing with positioning plates, and then welding the weld between the web and flanges. Because welding low-alloy high-strength steel plates often requires preheating, interpass heat control, and slow cooling after welding, and to control welding deformation, the H-beams need to be flipped during the welding process.

[0005] The conventional method for turning over H-beams during welding involves tying the H-beams with ropes, setting shackles at the lowest point, connecting the shackles with slings, and then using lifting equipment to hook onto the slings for raising and lowering, thus turning the H-beam over. However, this existing technology has the following limitations and drawbacks: 1. It relies heavily on workers' skills and experience, resulting in low work efficiency and hindering the mass welding of H-beams; 2. The positioning plate needs to be welded and ground off, which involves a lot of work, and the positioning plate will affect the continuous welding of the flange and web welds. 3. Using a lifting device for turning over requires the use of lifting equipment, which is inefficient. In addition, the lifting device is a flexible connection, and improper operation during the turning over process can easily cause collisions or damage to parts, resulting in production losses. 4. Welding of low-alloy high-strength thick plates involves a large workload, is difficult to control in terms of welding deformation, has low turnover efficiency for H-beams, is not conducive to maintaining welding continuity, and is prone to welding defects. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a flipping auxiliary device for welding H-beams and a welding method for H-beams, which has the advantages of improving the positioning accuracy, production efficiency and finished product quality of H-beam welding.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: In one aspect, the present invention provides a flipping auxiliary device for welding H-beams, comprising: A flipping mechanism is provided at both ends of the H-beam to be welded. The flipping mechanism includes a roller and a flipping clamping assembly. The flipping clamping assembly is disposed inside the roller and connected to the roller. At least one clamping and positioning mechanism is provided on the H-beam to be welded and is located between the two flipping mechanisms. The clamping and positioning mechanism is used to clamp and position the flange and web of the H-beam to be welded. The clamping and positioning mechanism includes a clamping assembly, and clamping uprights are detachably provided at both ends of the clamping assembly.

[0008] Compared to existing technologies, this application achieves flexible rotation of the H-beam by setting a rotating mechanism including rollers and a rotating clamping assembly at both ends of the H-beam to be welded, meeting the welding requirements at different angles. At the same time, at least one clamping and positioning mechanism is set between the two rotating mechanisms, with clamping upright plates detachably set at both ends of the clamping assembly. This mechanism can effectively clamp and position the flanges and webs of the H-beam to be welded, ensuring the stability of the H-beam's position during welding, reducing deformation, and improving welding accuracy and quality. Furthermore, the detachable structure facilitates adjustment according to different specifications of H-beams, enhancing the versatility and practicality of the device.

[0009] As a preferred embodiment of the present invention, the clamping and positioning mechanism includes two sets of clamping components, which are arranged facing each other, and the clamping plate is detachably connected to the two sets of clamping components respectively.

[0010] By adopting the above scheme, by setting two sets of opposing clamping components and detachably connecting the clamping plate to the two sets of components, an integral clamping frame can be formed on the upper and lower sides of the H-beam, realizing all-round synchronous positioning of the flange and web, further improving the stability and symmetry of clamping and positioning, and effectively preventing deformation caused by uneven force during welding.

[0011] As a preferred embodiment of the present invention, the clamping assembly includes: A clamping seat is provided with a pull rod on the bottom wall of the clamping seat. Both ends of the pull rod are provided with external threads. A through hole is provided on the clamping plate. The pull rod passes through the through hole and is threadedly connected to the clamping plate with a fastening nut. A web plate positioning assembly is disposed on the top wall of the clamping seat; The wing plate clamping assembly has two sets of wing plate clamping assemblies on the top wall of the clamping seat, and the two sets of wing plate clamping assemblies are respectively arranged facing the two clamping upright plates.

[0012] The above-mentioned solution uses a structure in which a tie rod, a fastening nut and a clamping plate work together. Combined with the web plate positioning assembly and the wing plate clamping assembly, it realizes independent adjustment and locking of the lateral position of the wing plate and the longitudinal position of the web plate. This allows the device to flexibly adapt to the assembly requirements of H-beams of different specifications, while ensuring the precise positioning of each component before welding.

[0013] As a preferred embodiment of the present invention, the web plate positioning assembly includes a positioning sleeve disposed on the top wall of the clamping seat, and a positioning stud is disposed inside the positioning sleeve.

[0014] Using the above method, the height of the web plate can be quickly adjusted by adjusting the height of the positioning stud. The operation is simple and the positioning accuracy is high, ensuring the accurate position of the web plate in the height direction and providing a good foundation for subsequent welding.

[0015] As a preferred embodiment of the present invention, the wing plate clamping assembly includes: A clamping seat, wherein the clamping seat is disposed on the top wall of the clamping clamping seat; Reinforcing ribs are respectively connected to the top clamping seat and the top clamping seat; A tightening bolt is provided, which passes through the tightening seat and is threadedly connected to the tightening seat, and the tightening bolt is positioned toward the clamping plate.

[0016] By adopting the above scheme, a lateral clamping structure with a stable structure and reliable clamping force is formed through the cooperation of the clamping seat, the reinforcing rib and the clamping bolt. The reinforcing rib effectively improves the rigidity of the clamping seat, making it less likely for the clamping bolt to deform when clamping force is applied, thus ensuring the lateral positioning stability of the flange during the welding process.

[0017] As a preferred embodiment of the present invention, a fixing plate is provided between the flipping mechanism and the inner sidewall of the roller, and the fixing plate is connected to the flipping mechanism and the roller respectively.

[0018] With the above - mentioned solution, by setting a fixed plate between the flipping mechanism and the inner side wall of the drum, the connection strength and overall stiffness between the flipping clamping component and the drum are enhanced, enabling the flipping mechanism to maintain structural stability when bearing the weight and flipping torque of the H - beam, and improving the reliability and service life of the flipping operation.

[0019] As a preferred solution of the present invention, the flipping mechanism includes four groups of flipping clamping components, and the four groups of flipping clamping components are distributed in a "square" shape and all four groups are arranged towards the axis of the drum.

[0020] With the above - mentioned solution, the flipping mechanism adopts four groups of flipping clamping components distributed in a "square" shape, which can uniformly press against the flange of the H - beam from four directions, forming a stable clamping state, avoiding loosening or displacement of the workpiece during the flipping process, and is particularly suitable for the smooth flipping of large or heavy H - beams.

[0021] As a preferred solution of the present invention, the flipping clamping component includes a clamping plate, the clamping plate is connected to the fixed plate, and a flipping bolt is threadedly connected to the clamping plate corresponding to the flange of the to - be - welded H - beam.

[0022] With the above - mentioned solution, the flipping clamping component is connected to the fixed plate through the clamping plate, and the flipping bolt connected by threads directly presses against the flange. The structure is simple and the operation is convenient. The pressing degree can be flexibly adjusted according to the size of the workpiece, ensuring that the workpiece and the drum remain relatively fixed during the flipping process, and enhancing the safety and adaptability of the flipping.

[0023] As a preferred solution of the present invention, it further includes a base, and a groove for placing the pressing and clamping component is provided on the base.

[0024] With the above - mentioned solution, by setting a base with a groove, a stable placement reference is provided for the pressing and clamping component, facilitating quick positioning and adjustment of the levelness during assembly, effectively improving the initial installation accuracy of the entire clamping and positioning mechanism, and laying a foundation for the high - precision assembly of the subsequent flange and web.

[0025] On the other hand, the present invention also provides a method for welding H - beams, which adopts the flipping auxiliary device for welding H - beams as described above. The method includes the following steps: S1. Place the base on the platform and adjust the levelness of the base device to ensure that the levelness ≤ 2mm; S2. Place a set of pressing and clamping components on the base and adjust the distance between the two clamping vertical plates according to the height of the to - be - welded H - beam; S3. Place the two flanges of the to - be - welded H - beam on the flange clamping components, and use the pressing bolts, clamping vertical plates, tie rods and fastening nuts to clamp and limit the two flanges; S4. Adjust the height of the positioning stud in the web positioning assembly so that the height of the positioning stud is consistent with the width of the H-beam, and then place the web of the H-beam to be welded. S5. Place another set of clamping components above the web plate. Similarly, use clamping bolts, clamping plates, tie rods, fastening nuts and positioning studs to clamp and fix the two wing plates and the web plate. Check the installation dimensions, verticality, horizontality and straightness of the web plate and wing plates. If they pass the inspection, proceed to the next process. Otherwise, adjustments should be made. S6. Install a flipping mechanism at both ends of the H-beam to be welded, adjust the flipping bolts to make them tighten against the H-beam to be welded so that they are not loose, and place the flipping mechanism on the roller frame after the inspection is qualified. S7. When welding the web and flange of the H-beam, the preheating, interpass heat control and post-heating measures of the H-beam must be strictly implemented according to the welding process. The weld should be multi-layer and multi-pass, and each layer of weld should not exceed 4mm. During the welding process, the deformation of the H-beam should be checked regularly. When the flange deformation exceeds 2mm, the H-beam should be flipped over using a flipping device to weld the reverse side weld symmetrically. The reverse deformation of the weld is used to reduce and eliminate the welding deformation of the H-beam. S8. After welding is completed, remove the clamping assembly, place the H-beam on the assembly fixture, level the fixture surface, check the deformation of the welded H-beam, and perform flame correction as needed to correct the deformation of the flange angle.

[0026] The aforementioned flipping auxiliary device and welding method for H-beams have the following advantages: By setting flipping mechanisms including rollers and flipping clamping components at both ends of the H-beam to be welded, and setting a clamping and positioning mechanism with a clamping clamping component and a detachable clamping upright between the two flipping mechanisms, welding-free precise positioning and clamping of the flanges and webs is achieved, avoiding the welding and grinding processes of the positioning plate in traditional processes and ensuring the continuity of the weld. At the same time, with the cooperation of rollers and flipping clamping components, the assembled H-beam can be mechanically flipped smoothly and efficiently, replacing the flexible flipping method of rope binding and lifting equipment, significantly reducing the difficulty of operation and safety risks, improving the flipping efficiency and workpiece protection, thereby improving the overall positioning accuracy, production efficiency and finished product quality of H-beam welding. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the flipping mechanism in a flipping auxiliary device for welding H-beams according to the present invention. Figure 2 This is a schematic diagram of the clamping and positioning mechanism in a flipping auxiliary device for welding H-beams according to the present invention. Figure 3 This is a schematic diagram of the base in a flipping auxiliary device for welding H-beams according to the present invention; Figure 4 is a schematic diagram of the welding process of an H-beam according to the present invention; In the diagram: 1. Tilting mechanism; 11. Roller; 12. Tilting clamping assembly; 121. Clamping plate; 122. Tilting bolt; 13. Fixing plate; 2. Clamping positioning mechanism; 21. Tightening clamping assembly; 211. Tightening clamping seat; 212. Pull rod; 213. Fastening nut; 22. Web plate positioning assembly; 221. Positioning sleeve; 222. Positioning stud; 23. Wing plate clamping assembly; 231. Tightening seat; 232. Reinforcing rib; 233. Tightening bolt; 24. Clamping upright plate; 3. Base; 31. Support plate; 32. Base plate; 4. H-beam; 41. Wing plate; 42. Web plate; 5. Roller frame.

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] To make the above-mentioned objectives and beneficial effects of the present invention more apparent and easily understood, the following detailed description, in conjunction with the accompanying drawings and multiple embodiments, will provide a detailed description of the flipping auxiliary device for welding H-beams and the welding method for H-beams provided by the present invention. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] Example 1 On the one hand, refer to Figures 1 to 3 This invention provides a flipping auxiliary device for welding H-beams, comprising a flipping mechanism 1, at least one clamping and positioning mechanism 2, and a base 3. Flipping mechanisms 1 are provided at both ends of the H-beam 4 to be welded. Each flipping mechanism 1 includes a roller 11 and a flipping clamping assembly 12, which is disposed inside and connected to the roller 11. The roller 11 cooperates with an external roller frame 5 or other driving device to achieve smooth flipping of the entire device. The clamping and positioning mechanism 2 is disposed on the H-beam 4 to be welded and located between the two flipping mechanisms 1. In this embodiment, there are three sets of clamping and positioning mechanisms 2. In other embodiments, the number of clamping and positioning mechanisms 2 can be adjusted according to actual conditions; the number of clamping and positioning mechanisms 2 is not limited here. The clamping and positioning mechanism 2 is used to clamp and position the flange 41 and web 42 of the H-beam 4 to be welded. The clamping and positioning mechanism 2 includes a clamping clamping assembly 21, both ends of which are detachably provided with clamping uprights 24. Specifically, the clamping plate 24 is connected to the top clamping assembly 21 by bolts so that it can be replaced or adjusted according to different specifications of H-beams 4.

[0033] Reference Figure 2 The clamping and positioning mechanism 2 includes two sets of clamping assemblies 21, which are arranged facing each other, with one set located above the H-beam 4 to be welded and the other below it. The clamping uprights 24 are detachably connected to both sets of clamping assemblies 21, thus connecting the upper and lower sets of clamping assemblies 21 into a single frame. During assembly, the lower clamping assembly 21 is placed on the base 3, while the upper clamping assembly 21 is pressed against the web 42 and wing 41. The upper and lower clamping assemblies 21 are tightened by the pull rod 212 and the fastening nut 213, achieving omnidirectional clamping and positioning of the H-beam 4's wing 41 and web 42. Each clamping assembly 21 includes a clamping seat 211, a web positioning assembly 22, and a wing clamping assembly 23.

[0034] Reference Figure 2The clamping seat 211 serves as the mounting base, and its bottom wall is provided with a pull rod 212, both ends of which are provided with external threads. A through hole is provided on the clamping plate 24, through which the pull rod 212 passes and is threadedly connected to a fastening nut 213. By tightening the fastening nut 213, the clamping plate 24 can be pulled towards the clamping seat 211, thereby clamping the upper and lower sides of the wing plate 41. A web plate positioning assembly 22 is provided on the top wall of the clamping seat 211 and is used to position the web plate 42 in the height direction. In this embodiment, there are two sets of web plate positioning assemblies 22. In other embodiments, the number of web plate positioning assemblies 22 can be increased or decreased according to actual needs; the number of web plate positioning assemblies 22 is not limited here. The wing plate clamping assembly 23 is disposed on the top wall of the clamping seat 211, and the top wall of the clamping seat 211 is provided with two sets of wing plate clamping assemblies 23. The two sets of wing plate clamping assemblies 23 are respectively disposed facing the two clamping upright plates 24, and are used to clamp the wing plates 41 of the H-beam 4 from both sides. In this embodiment, the clamping seat 211 is formed by casting or welding and has sufficient structural strength. The pull rod 212 can be fixedly connected to the clamping seat 211 by welding. In some other embodiments, the pull rod 212 can also be connected to the clamping seat 211 by threaded connection, as long as the connection strength between the pull rod 212 and the clamping seat 211 can be guaranteed.

[0035] Reference Figure 2 The web plate positioning assembly 22 includes a positioning sleeve 221 and a positioning stud 222. The positioning sleeve 221 is disposed on the top wall of the clamping seat 211, and has an internal thread. The positioning stud 222 is threadedly disposed within the positioning sleeve 221. By rotating the positioning stud 222, its extension height can be easily adjusted to accommodate web plates 42 of different widths. When multiple clamping and positioning mechanisms 2 are provided, all positioning studs 222 need to be adjusted to the same height to ensure that the web plate 42 can be placed stably and to ensure the horizontality of the web plate 42.

[0036] Reference Figure 2 The wing plate clamping assembly 23 includes a clamping seat 231, a reinforcing rib 232, and a clamping bolt 233. The clamping seat 231 is disposed on the top wall of the clamping seat 211. The reinforcing rib 232 is connected to both the clamping seat 231 and the clamping seat 211 to enhance the structural rigidity of the clamping seat 231. The clamping bolt 233 passes through the clamping seat 231 and is threadedly connected to it. The clamping bolt 233 faces the clamping upright plate 24. In use, the clamping bolt 233 is rotated so that its end clamps against the side of the wing plate 41, which, in conjunction with the clamping upright plate 24 on the other side, achieves precise lateral positioning of the wing plate 41.

[0037] Reference Figure 1A fixing plate 13 is provided between the flipping mechanism 1 and the inner wall of the roller 11. The fixing plate 13 is connected to both the flipping mechanism 1 and the roller 11. Specifically, the fixing plate 13 is a fan-shaped fixing plate, with its arc-shaped edge welded to the inner wall of the roller 11 and its flat side welded to the flipping clamping assembly 12. By setting the fan-shaped fixing plate, the connection area between the flipping clamping assembly 12 and the roller 11 is increased, thereby improving the overall structural strength. The flipping mechanism 1 includes four sets of flipping clamping assemblies 12, which are arranged in a "U" shape and all four sets of flipping clamping assemblies 12 are oriented towards the axis of the roller 11 to evenly clamp the H-beam 4 from four directions. Each set of flipping clamping assemblies 12 includes a clamping plate 121 and a flipping bolt 122. The clamping plate 121 is welded to the fixing plate 13, and the flipping bolt 122 is threaded onto the clamping plate 121, corresponding to the flange 41 of the H-beam 4 to be welded. By tightening and turning the bolt 122, the flange 41 of the H-beam 4 can be tightened to achieve fixation. In some other embodiments, the fixing plate 13 can also be connected to the roller 11 by riveting or integral molding, as long as sufficient connection strength can be ensured.

[0038] Reference Figure 3 The base 3 is used to place the clamping assembly 21 during assembly. The base 3 includes a support plate 31 and a base plate 32, which are connected by welding. After welding, the overall structure needs to be leveled to ensure that the levelness of the base plate 32 is ≤2mm, so as to provide a precise reference for subsequent assembly. The top wall of the support plate 31 has a groove for placing the clamping assembly 21. In this embodiment, the groove is a semi-circular hole, which provides space for the pull rod 212 in the clamping assembly 21, ensuring that the clamping assembly 21 can be placed stably on the base 3. When multiple sets of clamping and positioning mechanisms 2 are provided, the clamping assembly 21 under each set is placed in a corresponding groove.

[0039] Example 2 Reference Figures 4a to 4g On the other hand, the present invention also provides a method for welding H-beams, which employs the flipping auxiliary device for welding H-beams as described in Example 1, and the method includes the following steps: Step S1. Refer to Figure 4a Place base 3 on the platform and adjust the level of base 3 to ensure that the levelness is ≤2mm; Step S2. Refer to Figure 4b Place a set of clamping components 21 on the base 3, and adjust the distance between the two clamping plates 24 according to the height of the H-beam 4 to be welded. Step S3. Refer to Figure 4cPlace the two wing plates 41 of the H-beam 4 to be welded on the wing plate clamping assembly 23, and use the top bolt 233, clamping upright plate 24, pull rod 212 and fastening nut 213 to clamp and limit the two wing plates 41. Step S4. Refer to Figure 4d After adjusting the height of the positioning stud 222 in the web positioning assembly 22 so that the height of the positioning stud 222 is consistent with the width of the H-beam 4, place the web 42 of the H-beam 4 to be welded. Step S5. Refer to Figure 4e Another set of clamping components 21 is placed above the web plate 42. The two wing plates 41 and the web plate 42 are clamped and fixed using clamping bolts 233, clamping upright plates 24, pull rods 212, fastening nuts 213 and positioning studs 222. The installation dimensions, verticality, horizontality and straightness of the web plate 42 and wing plates 41 are checked. If they pass the inspection, the next process is carried out. Otherwise, adjustments should be made. Step S6. Refer to Figure 4f and Figure 4g Tilting mechanism 1 is installed at both ends of the H-beam 4 to be welded. Adjust the tilting bolt 122 to make it tighten against the H-beam 4 to be welded and prevent it from loosening. After the inspection is qualified, the tilting mechanism is placed on the roller frame 5. Step S7. Weld the weld between the web plate 42 and the flange plate 41 of the H-beam 4. Welding must strictly follow the welding process to do a good job in preheating, inter-pass heat control and post-heating of the H-beam 4. The weld should be multi-layer and multi-pass, and each layer of weld should not exceed 4mm. During the welding process, the deformation of the H-beam 4 should be checked regularly. When the deformation of the flange plate 41 exceeds 2mm, the H-beam 4 should be flipped over using a flipping device to weld the reverse side weld symmetrically. The welding reverse deformation is used to reduce and eliminate the welding deformation of the H-beam 4. Step S8. After welding is completed, remove the clamping assembly 21, place the H-beam 4 on the assembly fixture, level the fixture surface, check the deformation of the welded H-beam 4, and perform flame correction as needed to correct the angular deformation of the flange 41.

[0040] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A flipping auxiliary device for welding H-beams, characterized in that, Comprising: A turning mechanism, with turning mechanisms provided at both ends of the H-shaped steel to be welded. The turning mechanism includes a roller and a turning clamping component. The turning clamping component is arranged inside the roller and connected to the roller; At least one clamping and positioning mechanism, which is arranged on the H-shaped steel to be welded, and the clamping and positioning mechanism is located between the two turning mechanisms. The clamping and positioning mechanism is used to clamp and position the flange and web of the H-shaped steel to be welded; the clamping and positioning mechanism includes a top clamping component, and clamping vertical plates are detachably arranged at both ends of the top clamping component.

2. The flipping auxiliary device for welding H-beams according to claim 1, characterized in that: The clamping and positioning mechanism includes two groups of the top clamping components, and the two groups of the top clamping components are arranged facing each other. The clamping vertical plates are detachably connected to the two groups of the top clamping components respectively.

3. The flipping auxiliary device for welding H-beams according to claim 1, characterized in that, The top clamping component includes: A top clamping seat, with a pull rod provided on the bottom wall of the top clamping seat. External threads are provided at both ends of the pull rod. A through hole is provided on the clamping vertical plate. The pull rod passes through the clamping vertical plate through the through hole and is threadedly connected with a fastening nut; A web positioning component, which is arranged on the top wall of the top clamping seat; Flange clamping components, with two groups of flange clamping components arranged on the top wall of the top clamping seat. The two groups of flange clamping components are respectively arranged facing the two clamping vertical plates.

4. The flipping auxiliary device for welding H-beams according to claim 3, characterized in that: The web positioning component includes a positioning sleeve, which is arranged on the top wall of the top clamping seat, and a positioning stud is arranged inside the positioning sleeve.

5. The flipping auxiliary device for welding H-beams according to claim 3, characterized in that, The flange clamping component includes: A top seat, which is arranged on the top wall of the top clamping seat; Reinforcing ribs, which are respectively connected to the top seat and the top clamping seat; A top bolt, which passes through the top seat and is threadedly connected with the top seat. The top bolt is arranged facing the clamping vertical plate.

6. The flipping auxiliary device for welding H-beams according to claim 1, characterized in that: A fixing plate is arranged between the turning mechanism and the inner side wall of the roller. The fixing plate is respectively connected to the turning mechanism and the roller.

7. The flipping auxiliary device for welding H-beams according to claim 1, characterized in that: The turning mechanism includes four groups of turning clamping components. The four groups of turning clamping components are distributed in a "mouth" shape and all four groups of turning clamping components are arranged facing the axis of the roller.

8. The flipping auxiliary device for welding H-beams according to claim 6, characterized in that: The turning clamping component includes a clamping plate, which is connected to the fixing plate. A turning bolt is threadedly connected to the clamping plate corresponding to the flange of the H-shaped steel to be welded.

9. The flipping auxiliary device for welding H-beams according to claim 1, characterized in that: It further includes a base, and a groove for placing the top clamping component is provided on the base.

10. A method for welding H-beams, characterized in that, Adopting the turning auxiliary device for welding H-shaped steel according to any one of claims 1 to 9, the method includes the following steps: S1. Place the base on the platform and adjust the levelness of the base device to ensure that the levelness ≤ 2 mm; S2. Place a group of top clamping components on the base and adjust the distance between the two clamping vertical plates according to the height of the H-shaped steel to be welded; S3. Place the two flanges of the H-shaped steel to be welded on the flange clamping components, and use the top bolt, clamping vertical plate, pull rod and fastening nut to clamp and limit the two flanges; S4. Adjust the height of the positioning stud in the web positioning assembly so that the height of the positioning stud is consistent with the width of the H-beam, and then place the web of the H-beam to be welded. S5. Place another set of clamping components above the web plate. Similarly, use clamping bolts, clamping plates, tie rods, fastening nuts and positioning studs to clamp and fix the two wing plates and the web plate. Check the installation dimensions, verticality, horizontality and straightness of the web plate and wing plates. If they pass the inspection, proceed to the next process. Otherwise, adjustments should be made. S6. Install a flipping mechanism at both ends of the H-beam to be welded, adjust the flipping bolts to make them tighten against the H-beam to be welded so that they are not loose, and place the flipping mechanism on the roller frame after the inspection is qualified. S7. When welding the web and flange of the H-beam, the preheating, interpass heat control and post-heating measures of the H-beam must be strictly implemented according to the welding process. The weld should be multi-layer and multi-pass, and each layer of weld should not exceed 4mm. During the welding process, the deformation of the H-beam should be checked regularly. When the flange deformation exceeds 2mm, the H-beam should be flipped over using a flipping device to weld the reverse side weld symmetrically. The reverse deformation of the weld is used to reduce and eliminate the welding deformation of the H-beam. S8. After welding is completed, remove the clamping assembly, place the H-beam on the assembly fixture, level the fixture surface, check the deformation of the welded H-beam, and perform flame correction as needed to correct the deformation of the flange angle.

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