A steel structure cross column welding method

Abstract

The application discloses a steel structure cross column welding method and belongs to the technical field of steel structure processing. The steps include: manufacturing cross column monomer one and cross column monomer two with different sections; fixing the two through support seat one and support seat two with a preset height to realize automatic and accurate centering of the center line; installing a ring metal piece matched with the monomer as a reference platform; welding connecting web plate three; using the adjustable fixing plate and the limiting bolt installed on the ring metal piece, sequentially performing outside clamping, accurate positioning and rigid constraint on the four flange plates three, and sequentially completing butt welding of the flange plates three with the monomer flanges at two ends and angle welding with the web plate three; and finally removing all toolings. The core of the application is that through the support seat automatic centering system and the adjustable outside rigid constraint system, active control of high-precision positioning and welding deformation and high-quality weld forming are realized, and the application has the advantages of simple operation, stable quality and tooling losslessness.

Description

Technical Field

[0001] This invention belongs to the field of steel structure processing technology, and specifically relates to a method for welding steel structure cross columns. Background Technology

[0002] A cruciform column is a column with a cruciform cross-section or a box-shaped composite column. It is a composite steel column formed by connecting two or more H-beams, T-beams, or steel plates orthogonally in a cruciform shape. Its core feature is that the cross-section is symmetrical about both principal axes, which gives it similar and excellent bending stiffness, compressive bearing capacity, and torsional performance in both the X and Y directions. It has become a key vertical load-bearing component in important steel structure systems such as high-rise buildings, long-span structures, heavy-duty industrial plants, and bridges.

[0003] From the perspective of cross-section composition and manufacturing process, common cross columns are mainly divided into two categories: The first category is "integral assembly type", which means that in the factory, two web plates and four flange plates are directly welded together to form a complete cross-shaped cross section. This process has extremely high requirements for plate cutting, assembly accuracy and welding deformation control; The second category is "profile combination type", which uses existing rolled or welded H-beams as the base, and then welds T-beams symmetrically on both sides of its web plate to form a cross-shaped cross section.

[0004] In practical engineering, due to building function, structural stress, or construction requirements, it is often necessary to connect cross-shaped columns with different cross-sectional dimensions to form variable cross-section columns. For example, larger cross-shaped columns are used in the lower floors of high-rise buildings to bear greater loads, while smaller cross-shaped columns are used in the upper floors. The connection nodes of such variable cross-shaped columns are a challenge in their design and manufacturing.

[0005] In existing technologies, two cross-shaped column units with different cross-sectional dimensions are fabricated according to construction requirements, and then the web and flange plates of the connecting section are welded between the webs of the two cross-shaped column units. The challenge lies in efficiently and accurately aligning and fitting these individual plates simultaneously with the corresponding flange and web edges on both units, while maintaining their stable position during welding. Currently, simple spot welding or manual support is often used, resulting in poor positioning accuracy and a high risk of displacement or deformation under the heat-affected zone of subsequent welding, leading to poor weld quality and uneven transitions. Summary of the Invention

[0006] The purpose of this invention is to solve the aforementioned technical problems in the prior art and to provide a welding method for steel structure cross columns that can achieve rapid and accurate centering, provide precise positioning and stable limiting for the connecting sections, and improve welding quality.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A method for welding a steel structure cross column, characterized by comprising the following steps:

[0009] S1. Fabrication of Cross Column Unit 1: Two T-shaped steels are symmetrically welded on both sides of H-shaped steel to obtain cross column unit 1, which includes flange plate 1 and web plate 1.

[0010] S2. Fabrication of Cross Column Unit Two: Two T-shaped steels are symmetrically welded on both sides of H-shaped steel unit two to obtain cross column unit two, such that cross column unit two includes flange plate two and web plate two, and the cross-sectional area of ​​cross column unit two is smaller than that of cross column unit one.

[0011] S3. Fix the cross column unit 1: Fix the support base 1 on the workbench, then install the cross column unit 1 on the support base, and fix the cross column unit 1 and the support base 1 in place.

[0012] S4. Fix the second cross column unit: Fix the second support base on the workbench, then install the second cross column unit at the second support base, and fix the second cross column unit and the second support base together.

[0013] S5. Install the first and second ring-shaped metal parts: Based on the dimensions of the first cross-shaped column unit, manufacture the first ring-shaped metal part. The center of the first ring-shaped metal part has a through hole. Then, fit the first ring-shaped metal part onto the first cross-shaped column unit and fix the first ring-shaped metal part and the first cross-shaped column unit so that the first cross-shaped column unit passes through the through hole in the center. Based on the dimensions of the second cross-shaped column unit, manufacture the second ring-shaped metal part. The center of the second ring-shaped metal part has a through hole. Then, fit the second ring-shaped metal part onto the second cross-shaped column unit and fix the second ring-shaped metal part and the second cross-shaped column unit so that the second cross-shaped column unit passes through the through hole in the center. At this time, the center line of the second cross-shaped column unit coincides with the center line of the first cross-shaped column unit.

[0014] S6. Weld web plate three between web plate one and web plate two.

[0015] S7. Welding the left flange plate three: Install a fixing plate on the annular metal part one and the annular metal part two. The fixing plate is threaded with a limit bolt. The fixing plate and the web plate three on the left side are set accordingly. Then install the flange plate three on the web plate three on the left side. The flange plate three is attached to the web plate three. At the same time, the flange plate three is mated between the flange plate one and the flange plate two. Then tighten the limit bolt. The end of the limit bolt is pressed against the surface of the flange plate three, so that the flange plate three is limited on the web plate three. At this time, the limit bolt and the web plate three correspond to each other. Then weld the flange plate three to the flange plate one, the flange plate three to the flange plate two and fix them. Then weld the flange plate three to the web plate three and fix them.

[0016] S8. Using the same steps as S7, weld the right flange plate three.

[0017] S9. Using the same steps as S7, weld the upper and lower flange plates three to obtain the steel structure cross column.

[0018] S10. After the welded joints of S7 to S9 have cooled naturally, remove all fixing plates. Then remove support seat one and support seat two from the workbench and remove support seat one and support seat two from the steel structure cross column. Then remove ring-shaped metal part one and ring-shaped metal part two from the steel structure cross column.

[0019] Furthermore, the support base includes a base plate and a support plate. The support plate is vertically welded to the base plate. A guide member is welded to the support plate, and the guide member has a guide hole. The support plate has a through hole three, which corresponds to the guide hole. A connecting plate one is fixed to the guide member, and a connecting plate two is fixed between the flange plate one and the web plate one. The cross column unit one is installed on the support base one. At this time, the flange plate one and the web plate one pass horizontally through the guide hole and through the through hole three. When the cross column unit one is in the set position of the support base one, the fixing bolt one is screwed into the threaded hole of the connecting plate one and the threaded hole of the connecting plate two, so that the cross column unit one and the support base one are fixedly connected.

[0020] Furthermore, a reinforcing plate is fixed between the guide component and the support plate.

[0021] Furthermore, the support base 2 includes a base plate 2 and a support plate 2, with the support plate 2 vertically welded to the base plate 2; the cross column unit 1 is installed on the support base 1, at which point the cross column unit 1 is placed at a set position on the top of the support plate 2, and then a clamping plate is installed on the support plate 2. Then, a mounting bolt is inserted between the clamping plate and the top of the support plate 2, and a mounting nut is screwed into the mounting bolt and tightened onto the support plate 2, so that the clamping plate presses against the flange plate 2 located below.

[0022] Furthermore, the top of the support plate 2 is provided with a limiting groove, and the bottom of the pressing plate is provided with a limiting protrusion, which is located in the limiting groove.

[0023] Furthermore, a clamping structure is used to fix the annular metal part one and the cross-shaped column unit one, and the annular metal part two and the cross-shaped column unit two. A connecting plate three is fixed between the flange plate one and the web plate one, and a connecting plate four is fixed between the flange plate two and the web plate two. The clamping structure includes two symmetrically arranged clamping plates. When the clamping structure fixes the annular metal part one and the cross-shaped column unit one, the clamping plate is fixed to the annular metal part one using fixing bolt two. A threaded rod is inserted between the clamping plate and the connecting plate three, and locking nuts are screwed into both ends of the threaded rod and tightened. The two clamping plates clamp the annular metal part one and the connecting plate three. When the clamping structure fixes the annular metal part two and the cross-shaped column unit two, the clamping plate is fixed to the annular metal part two using fixing bolt two. A threaded rod is inserted between the clamping plate and the connecting plate four, and locking nuts are screwed into both ends of the threaded rod and tightened. The two clamping plates clamp the annular metal part two and the connecting plate four.

[0024] Furthermore, both ends of the fixing plate are fixed with fixing ends. A first annular metal part is welded with a first fixing post, which is threadedly connected to an adjusting nut. The first fixing post passes through the mounting hole of the fixing end, and the fixing end is clamped by two adjusting nuts. By changing the position of the adjusting nut on the first fixing post, the distance between the fixing plate and the web plate is changed.

[0025] Furthermore, the inner surface of the fixing plate is parallel to the outer surface of the flange plate three.

[0026] Furthermore, after the welding of flange plate three and flange plate one, and flange plate three and flange plate two is completed, an angle steel is fixed on the annular metal part one by fixing bolt three. Two angle steels are used to clamp flange plate three. After the welded area cools naturally, the fixing bolt three is unscrewed and the angle steel is removed.

[0027] Furthermore, after S10 is completed, an anti-corrosion layer is sprayed onto the surface of the steel structure cross column.

[0028] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0029] 1. This invention achieves high-precision and high-efficiency automatic shaft centering, significantly improving positioning accuracy.

[0030] By pre-calculating and setting the height difference between support base one and support base two, directly installing and fixing the cross-shaped column unit one and unit two ensures that their central axes automatically and accurately coincide, eliminating the need for traditional manual repeated measurements and adjustments. This method simplifies the complex three-dimensional spatial positioning problem into a single-variable control of the height of two support bases, and by fixing support base one and support base two separately, it eliminates quality hazards such as uneven weld stress and stress concentration caused by alignment deviations. Practice shows that the axis alignment deviation is stably controlled within ±0.8mm, providing a precise assembly foundation for achieving uniform stress and stable load-bearing of the full penetration weld.

[0031] 2. The design of the external tightening limit bolt enables active control of welding deformation and improves the quality of weld formation.

[0032] The limiting bolt of this invention is tightened and fixed from the outside of the flange plate three. This design has two advantages: First, the tightening force of the bolt is directly transmitted to the inner web plate three through the flange plate three, forming a highly efficient rigid constraint closed loop, which can actively offset the welding shrinkage stress and reduce the welding angular deformation of the flange plate by more than 65%. Second, there is no tooling obstruction on the inner side of the T-shaped joint to be welded between the flange plate three and the web plate three (i.e., the fillet weld position), providing unobstructed space and clear vision for the welding torch. This allows the welder to perform all-position welding with the optimal posture, ensuring root penetration and uniform weld leg size, resulting in a first-pass yield rate of over 98%, excellent appearance, and significantly reduced rework rate and correction workload.

[0033] 3. A modular and adjustable assembly benchmark system was established, enabling high-precision and rapid assembly of the connecting sections.

[0034] Using a ring-shaped metal component as a customizable annular reference platform, along with adjustable limiting bolts, a separate, finely adjustable, and precise positioning and clamping solution is provided for the four independent flange plates. This system allows for individual adjustment of each flange plate, ensuring smooth alignment with the flange plates on the first and second cross-shaped units and a tight fit with the web plate. This eliminates welding defects such as incomplete fusion and undercut caused by misalignment, excessive gaps, or unevenness during assembly, ensuring weld fusion quality from the outset. Using this system, the assembly accuracy (misalignment) between the flange plate and the web plate can be controlled within ±0.5mm, laying a reliable assembly foundation for subsequent high-quality welding.

[0035] 4. It enables non-destructive assembly and disassembly, ensuring the integrity of components and the quality of subsequent processing.

[0036] After the process is completed, all tooling can be completely removed without leaving any weld marks, cutting marks, or permanent connectors on the surface of the cross-shaped column. This preserves the integrity of the base material, avoids potential damage caused by cleaning temporary welds, and allows for direct post-processing such as spraying on the component surface, improving the adhesion of the anti-corrosion coating. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the structure of the cross-shaped column unit one in this invention;

[0039] Figure 2 This is a schematic diagram of the structure of the second cross-shaped column in this invention;

[0040] Figure 3 This is a schematic diagram of the structure of the present invention when the cross-shaped column is fixed;

[0041] Figure 4 This is a schematic diagram of the structure of the present invention when the cross-shaped column unit is fixed.

[0042] Figure 5 This is a schematic diagram of the structure of the support base one in this invention;

[0043] Figure 6 This is an exploded view of the second support base in this invention;

[0044] Figure 7 This is a schematic diagram of the structure when the first annular metal part and the second annular metal part are installed according to the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the annular metal part one in this invention;

[0046] Figure 9 This is a schematic diagram of the structure of the second annular metal part in this invention;

[0047] Figure 10 This is a schematic diagram of the clamping structure in this invention;

[0048] Figure 11 This is a schematic diagram of the structure when web plate three is welded between web plate one and web plate two in this invention;

[0049] Figure 12 This is a schematic diagram of the structure when welding the left and right flange plates of the present invention.

[0050] Figure 13 This is a schematic diagram of the structure of the fixing plate in this invention;

[0051] Figure 14 This is a schematic diagram of the structure of the fixing plate connecting fixing column one and fixing column two in this invention;

[0052] Figure 15 This is a schematic diagram of the structure of the upper and lower flange plates of the present invention when they are welded together;

[0053] Figure 16 This is a schematic diagram of the structure of the angle steel clamping flange plate three of the present invention;

[0054] Figure 17 This is a schematic diagram of the steel cross column structure of the present invention.

[0055] In the diagram, 100 - Cross-shaped single unit; 101 - Flange plate 1; 102 - Web plate 1; 103 - Connecting plate 3; 104 - Connecting plate 2;

[0056] 200-Cross-shaped single unit, part two; 201-Flange plate, part two; 202-Web plate, part two; 203-Connecting plate, part four;

[0057] 300-Support base one; 301-Base plate one; 302-Support plate one; 303-Guide component; 304-Guide hole; 305-Reinforcing plate; 306-Through hole three; 307-Connecting plate one; 308-Fixing bolt one;

[0058] 400 - Support base two; 401 - Base plate two; 402 - Support plate two; 403 - Pressure plate; 404 - Mounting bolt; 405 - Limiting groove; 406 - Limiting protrusion; 407 - Mounting nut;

[0059] 501 - Ring-shaped metal part; 502 - Through hole; 503 - Fixing post; 504 - Adjusting nut;

[0060] 601 - Two ring-shaped metal parts; 602 - Two through holes; 603 - Two fixing posts; 604 - Two adjusting nuts;

[0061] 700-Clamping structure; 701-Clamping plate; 702-Threaded rod; 703-Locking nut; 704-Securing bolt II;

[0062] 801 - Web plate three; 802 - Flange plate three;

[0063] 901 - Fixing plate; 902 - Limiting bolt; 903 - Fixing end;

[0064] 1001 - Angle steel; 1002 - Fixing bolt three;

[0065] a-Workbench. Detailed Implementation

[0066] like Figures 1 to 17 As shown, the present invention provides a method for welding steel structure cross columns.

[0067] Example:

[0068] This embodiment describes the welding process for variable cross-section cross columns required in a high-rise building. The lower cross column has a larger cross-section, while the upper cross column has a smaller cross-section. Precise butt welding of the two columns needs to be completed in the factory.

[0069] Step S1: Create a single cross-shaped column unit - 100:

[0070] Select an H-beam that meets the design requirements. According to the design dimensions, cut the H-beam along the centerline of its web to prepare two T-beams. Symmetrically weld the webs of the two T-beams to both sides of the web of the H-beam, so that the steel structure section consists of flange plate 101 and web plate 102. Then, weld connecting plate 104 and connecting plate 103 between flange plate 101 and web plate 102, ensuring the welding quality meets specifications. After welding, a cross-shaped column unit 100 is formed. The welds are then cleaned and visually inspected.

[0071] Step S2: Construct a cross-shaped single unit, 200:

[0072] Select a smaller H-beam II. According to the design dimensions, cut the H-beam II along the centerline of its web to prepare two T-beam IIs. Symmetrically weld the webs of the two T-beam IIs to both sides of the web of the H-beam II, so that the steel structure section consists of flange plate II 201 and web plate II 202. Then, weld connecting plate IV 203 between flange plate II 201 and web plate II 202, ensuring the welding quality meets specifications. After welding, a cross-shaped column unit II 200 is formed. The cross-sectional area of ​​cross-shaped column unit II 200 is smaller than that of cross-shaped column unit I 100. Then, clean and visually inspect the welds.

[0073] Step S3: Fix the cross-shaped column unit 100:

[0074] Using a horizontal platform as workbench a, a pre-fabricated support base 300 is positioned and fixed onto workbench a using bolts. The support base 300 includes a base plate 301 and a support plate 302 vertically welded to it. A guide member 303 is welded onto the support plate 302, and a reinforcing plate 305 is welded between the guide member 303 and the support plate 302 to enhance overall rigidity. A guide hole 304 is provided on the guide member 303, and a through hole 306 is provided at a corresponding position on the support plate 302. The cross-shaped column unit 100 is hoisted to the support base 300, so that its flange plate 101 and web plate 102 horizontally pass through the guide hole 304 and the through hole 306. When the cross-shaped column unit 100 reaches the preset position (by marking the length on the cross-shaped column unit 100 so that the marked point aligns with the side of the support plate 302), the fixing bolt 308 is screwed into the threaded hole of the connecting plate 104, which is welded to the cross-shaped column unit 100 (at the angle between the flange plate 101 and the web plate 102), and then screwed into the threaded hole of the connecting plate 307 on the guide member 303 and tightened. This achieves precise positioning and secure fixing of the cross-shaped column unit 100 on the support base 300. Figure 3 As shown.

[0075] Step S4: Fix the cross-shaped column unit 200:

[0076] On workbench a, a support base 400 is designed based on the pre-calculated height difference. The support base 400 includes a base plate 401 and a support plate 402 vertically welded to the base plate 401. A limiting groove 405 is machined on the top of the support plate 402. The pre-made support base 400 is positioned and fixed on workbench a using bolts. The cross column unit 200 is hoisted onto the support base 400, so that its lower flange plate 201 sits at the top of the support plate 402. A clamping plate 403 is installed, so that the limiting protrusion 406 at the bottom of the clamping plate 403 is embedded in the limiting groove 405 of the support plate 402 to prevent the clamping plate 403 from moving laterally. Then, insert mounting bolts 404 into the mounting holes at the top of the clamping plate 403 and the second support plate 402, and screw mounting nuts 407 onto the mounting bolts 404 and tighten them, so that the clamping plate 403 firmly presses against the lower flange plate 201, completing the fixation of the cross column unit 200. At this time, by precisely setting the height of the two support seats, it is ensured that the center line of the cross column unit 200 coincides with the center line of the cross column unit 100, such as... Figure 4 As shown.

[0077] Step S5: Install the ring-shaped metal part:

[0078] Based on the cross-sectional outer contour dimensions of cross-shaped column unit 100, an annular metal part 501 is manufactured, with the central through hole 502 larger than the cross-section of cross-shaped column unit 100 to ensure smooth insertion. Simultaneously, based on the cross-sectional outer contour dimensions of cross-shaped column unit 200, an annular metal part 601 is manufactured, with the central through hole 602 larger than the cross-section of cross-shaped column unit 200 to ensure smooth insertion.

[0079] Insert the annular metal part 501 onto the fixed cross-shaped column unit 100 and move it to a position close to the end to be connected. Secure it using a clamping structure 700: place two symmetrical clamping plates 701 on both sides of the annular metal part 501 and the connecting plate 103. First, use fixing bolts 704 to initially connect the clamping plates 701 to the annular metal part 501. Then, pass the threaded rod 702 through the holes on the clamping plates 701 and the connecting plate 103. Screw the locking nuts 703 into both ends of the threaded rod 702 and tighten them, so that the two clamping plates 701 simultaneously clamp the annular metal part 501 and the connecting plate 103, ensuring that there is no relative displacement between the annular metal part 501 and the cross-shaped column unit 100, and that the cross-shaped column unit 100 passes centrally through the through hole 502.

[0080] Insert the annular metal part 601 onto the fixed cross-shaped column unit 200 and move it to a position close to the end to be connected. Secure it using a clamping structure 700: place two symmetrical clamping plates 701 on both sides of the annular metal part 601 and the connecting plate 203. First, use fixing bolts 704 to initially connect the clamping plates 701 to the annular metal part 601. Then, pass the threaded rod 702 through the holes in the clamping plates 701 and the connecting plate 203. Screw the locking nuts 703 into both ends of the threaded rod 702 and tighten them, so that the two clamping plates 701 simultaneously clamp the annular metal part 601 and the connecting plate 203, ensuring that there is no relative displacement between the annular metal part 601 and the cross-shaped column unit 200, and that the cross-shaped column unit 200 passes centrally through the through hole 602.

[0081] At this point, a precisely centered annular metal component is fixed to each of the two aligned cross-shaped column units, together forming a stable reference frame for the connecting area, such as... Figure 7 As shown.

[0082] Step S6: Weld the web of the joint section 3801:

[0083] Measure the precise distance between the end faces of web plate 102 and web plate 202, and prepare web plate 3 801 by cutting the material. Insert web plate 3 801 into the gap between them, and adjust its position so that its two sides align with the end faces of web plate 102 and web plate 202 respectively. After initial fixation by tack welding, perform double-sided bevel welding using a suitable welding process (such as CO2 gas shielded welding) to complete the installation of web plate 3 801. Figure 11 As shown.

[0084] Step S7: Segmented assembly and welding of the flange plate of section 3802:

[0085] S7-1: Tooling Positioning and Adjustment

[0086] For the side to be welded (taking the left side as an example), a special fixing plate 901 is installed. The fixing plate 901 is formed by stamping. The fixing ends 903 at both ends of the fixing plate 901 are respectively fitted onto the fixing posts 503 on the annular metal part 501 and the fixing posts 603 on the annular metal part 601. In this invention, both fixing posts 503 and 603 are threaded with two adjusting nuts. One adjusting nut can be screwed in first, then the fixing plate 901 is installed, and then the other adjusting nut is screwed in. By rotating the two adjusting nuts 504 on fixing post 503 and the two adjusting nuts 604 on fixing post 603, the position of the fixing plate 901 is precisely adjusted until its inner surface is parallel to the outer surface of the flange plate 802 to be installed, leaving room for the plate thickness and operation. After adjustment, the adjusting nuts are tightened to lock the fixing ends 903 onto fixing posts 503 and 603.

[0087] S7-2: Flange plate 3802 in place and active restraint:

[0088] Insert the left flange plate 3 802, ensuring it fits tightly against the welding side (left side) of the web plate 3 801, and ensuring seamless planar connection between its two ends and the flange plate 101 of the cross column unit 100 and the flange plate 201 of the cross column unit 200. Then, simultaneously tighten the multiple limiting bolts 902 distributed on the fixing plate 901. This invention uses three limiting bolts 902 on the fixing plate 901, ensuring their ends are evenly and firmly pressed against the outer surface of the flange plate 3 802. Since the fixing plate 901 is pre-positioned precisely, and the force application points of each limiting bolt 902 are directly opposite the position of the internal web plate 3 801, a rigid constraint system consisting of the limiting bolts, flange plate 3, and web plate 3 is formed, effectively counteracting the shrinkage stress generated during subsequent welding.

[0089] S7-3: Sequential Welding and Process Monitoring

[0090] First, the butt welds between flange plate 3 (802) and flange plate 1 (101), and between flange plate 3 (802) and flange plate 2 (201) are welded using multi-layer, multi-pass welding to ensure full penetration. Then, the fillet welds between flange plate 3 (802) and web plate 3 (801) are welded. During welding, the tightness of the limiting bolts 902 and the deformation trend of flange plate 3 (802) are monitored in real time, and fine adjustments are made as necessary. To further suppress deformation during the welding cooling process, a pair of angle steels 1001 can be temporarily added to the annular metal part 1 (501) using fixing bolts 3 (1002) to clamp the edge of the already welded butt welded flange plate 3 (802), providing auxiliary constraint.

[0091] S7-4: Complete the full cycle of welding using a cyclical operation:

[0092] After completing the welding of the left flange plate 3.802, repeat operations S7-1 to S7-3 to complete the assembly and welding of the right, upper, and lower flange plates 3.802 in sequence. Figure 15 As shown. This step-by-step cyclic operation mode ensures that each flange plate 3802 can obtain independent and precise positioning and rigid constraint, thereby ensuring the uniformity and consistency of the weld quality around the perimeter while operating efficiently.

[0093] After all four flange plates 3802 are welded and cooled, a complete steel structure cross column is formed. The web plate 3801 and the flange plate 3802 constitute the connecting section. In each steel structure cross column, the connecting section is fixed between cross column unit 100 and cross column unit 200.

[0094] Step S8: Tooling removal and post-processing:

[0095] After all welded areas have cooled to room temperature naturally, safely remove all fixtures in the following order:

[0096] 1. If angle steel 1001 is installed, unscrew fixing bolt 3 1002 and remove all auxiliary constraint angle steel 1001.

[0097] 2. Loosen the limit bolt 902, then unscrew the adjusting nut 1 504 and adjusting nut 2 604, and remove all the fixing plates 901.

[0098] 3. Unscrew the fixing bolt 308 on the support base 300, then remove the support base 300 on the workbench a. At the same time, unscrew the mounting nuts 407 and mounting bolts 404 on the clamping plate 403 and the support plate 402. Then remove the support base 400 on the workbench a. Remove the support base 300 and the support base 400 from the steel structure cross column, and hoist the steel structure cross column to the designated position.

[0099] 4. Unscrew the threaded rod 702, locking nut 703 and fixing bolt 704 on the clamping structure 700, remove the clamping plate 701, remove the annular metal part 501 and annular metal part 601, and then place the steel structure cross columns in an orderly manner.

[0100] All welded joints were visually inspected and subjected to non-destructive testing to confirm their quality was up to standard.

[0101] Step S9: Finally, clean the surface of the entire steel structure cross column and spray an anti-corrosion coating according to the design requirements. A single-layer high-performance anti-corrosion coating can be used, usually epoxy coating. The dry film thickness of the film formed in one step should reach more than 120-150μm.

[0102] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A method for welding a steel structure cross column, characterized in that, Specifically, the steps include the following: S1. Fabrication of Cross Column Unit 1: Two T-shaped steels are symmetrically welded on both sides of H-shaped steel to obtain cross column unit 1, which includes flange plate 1 and web plate 1. S2. Fabrication of Cross Column Unit Two: Two T-shaped steels are symmetrically welded on both sides of H-shaped steel unit two to obtain cross column unit two, such that cross column unit two includes flange plate two and web plate two, and the cross-sectional area of ​​cross column unit two is smaller than that of cross column unit one. S3. Fix the cross column unit 1: Fix the support base 1 on the workbench, then install the cross column unit 1 on the support base, and fix the cross column unit 1 and the support base 1 in a fixed connection. S4. Fix the second cross column unit: Fix the second support base on the workbench, then install the second cross column unit at the second support base, and fix the second cross column unit and the second support base together. S5. Installing Ring-shaped Metal Part 1 and Ring-shaped Metal Part 2: Based on the dimensions of Cross-shaped Column Unit 1, manufacture Ring-shaped Metal Part 1. Ring-shaped Metal Part 1 has a through hole 1 at its center. Then, fit Ring-shaped Metal Part 1 onto Cross-shaped Column Unit 1 and fix Ring-shaped Metal Part 1 and Cross-shaped Column Unit 1 so that Cross-shaped Column Unit 1 passes through the through hole 1 in the center. Based on the dimensions of Cross-shaped Column Unit 2, manufacture Ring-shaped Metal Part 2. Ring-shaped Metal Part 2 has a through hole 2 at its center. Then, fit Ring-shaped Metal Part 2 onto Cross-shaped Column Unit 2 and fix Ring-shaped Metal Part 2 and Cross-shaped Column Unit 2 so that Cross-shaped Column Unit 2 passes through the through hole 2 in the center. At this time, the center line of Cross-shaped Column Unit 2 coincides with the center line of Cross-shaped Column Unit 1. S6. Weld web plate three between web plate one and web plate two; S7. Welding the left flange plate three: Install a fixing plate on the annular metal part one and the annular metal part two. The fixing plate is threaded with a limit bolt. The fixing plate and the web plate three on the left side are set accordingly. Then install the flange plate three on the web plate three on the left side. The flange plate three is attached to the web plate three. At the same time, the flange plate three is mated between the flange plate one and the flange plate two. Then tighten the limit bolt. The end of the limit bolt is pressed against the surface of the flange plate three, so that the flange plate three is limited on the web plate three. At this time, the limit bolt and the web plate three correspond to each other. Then weld the flange plate three to the flange plate one, the flange plate three to the flange plate two, and then weld the flange plate three to the web plate three. S8. Using the same steps as S7, weld the third flange plate on the right side; S9. Using the same steps as S7, weld the upper and lower flange plates three to obtain the steel structure cross column. S10. After the welded joints of S7 to S9 have cooled naturally, remove all fixing plates. Then remove support seat one and support seat two from the workbench and remove support seat one and support seat two from the steel structure cross column. Then remove ring-shaped metal part one and ring-shaped metal part two from the steel structure cross column.

2. The method for welding a steel structure cross column according to claim 1, characterized in that: The support base includes a base plate and a support plate. The support plate is vertically welded to the base plate. A guide member is welded to the support plate, and the guide member has a guide hole. The support plate has a through hole three, which corresponds to the guide hole. A connecting plate one is fixed to the guide member. A connecting plate two is fixed between the flange plate one and the web plate one. The cross column unit one is installed on the support base one. At this time, the flange plate one and the web plate one pass through the guide hole and the through hole three in the horizontal direction. When the cross column unit one is in the set position of the support base one, the fixing bolt one is screwed into the threaded hole of the connecting plate one and the threaded hole of the connecting plate two, so that the cross column unit one and the support base one are fixedly connected.

3. The method for welding a steel structure cross column according to claim 2, characterized in that: A reinforcing plate is fixed between the guide member and the support plate.

4. The method for welding a steel structure cross column according to claim 1, characterized in that: The second support base includes a second base plate and a second support plate, with the second support plate vertically welded to the second base plate. The first cross column unit is installed on the first support base, at which point the first cross column unit is placed at a predetermined position on the top of the second support plate. Then, a clamping plate is installed on the second support plate. A mounting bolt is then inserted between the clamping plate and the top of the second support plate, and a mounting nut is screwed into the mounting bolt. The mounting nut is then tightened onto the second support plate, so that the clamping plate presses against the lower flange plate.

5. The method for welding a steel structure cross column according to claim 4, characterized in that: The top of the second support plate is provided with a limiting groove, and the bottom of the pressing plate is provided with a limiting protrusion, which is located in the limiting groove.

6. The method for welding a steel structure cross column according to claim 1, characterized in that: A clamping structure is used to fix the annular metal part 1 and the cross-shaped column unit 1, and the annular metal part 2 and the cross-shaped column unit 2. A connecting plate 3 is fixed between the flange plate 1 and the web plate 1, and a connecting plate 4 is fixed between the flange plate 2 and the web plate 2. The clamping structure includes two symmetrically arranged clamping plates. When the clamping structure fixes the annular metal part 1 and the cross-shaped column unit 1, the clamping plate is fixed to the annular metal part 1 with a fixing bolt 2. A threaded rod is inserted between the clamping plate and the connecting plate 3, and locking nuts are screwed into both ends of the threaded rod and tightened. The two clamping plates clamp the annular metal part 1 and the connecting plate 3. When the clamping structure fixes the annular metal part 2 and the cross-shaped column unit 2, the clamping plate is fixed to the annular metal part 2 with a fixing bolt 2. A threaded rod is inserted between the clamping plate and the connecting plate 4, and locking nuts are screwed into both ends of the threaded rod and tightened. The two clamping plates clamp the annular metal part 2 and the connecting plate 4.

7. The method for welding a steel structure cross column according to claim 1, characterized in that: Both ends of the fixing plate are fixed with fixing ends. The first annular metal part is welded with a fixing post. The first fixing post is threaded with an adjusting nut. The first fixing post passes through the mounting hole of the fixing end. The fixing end is clamped by two adjusting nuts. By changing the position of the adjusting nut on the first fixing post, the distance between the fixing plate and the third web plate is changed.

8. The method for welding a steel structure cross column according to claim 7, characterized in that: The inner surface of the fixing plate is parallel to the outer surface of the flange plate.

9. The method for welding a steel structure cross column according to claim 1, characterized in that: After the flange plate three and flange plate one, and flange plate three and flange plate two are welded together, an angle steel is fixed to the annular metal part one by fixing bolt three. The flange plate three is clamped by two of the angle steels. After the welded area cools down naturally, the fixing bolt three is unscrewed and the angle steel is removed.

10. The method for welding a steel structure cross column according to claim 1, characterized in that: After S10 is completed, an anti-corrosion layer is sprayed onto the surface of the steel structure cross column.

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