Building H-shaped steel welding method

Abstract

The invention relates to the field of steel structure building welding, and discloses a building H-shaped steel welding method which comprises the following steps: (1) assembling plates in a T shape; (2) assembling the plates in an H shape; (3) backing welding; (4) submerged arc welding; (5) correcting the H-shaped steel; (6) end face milling; and (7) stiffening plate welding. According to the method, the H-shaped steel meeting the specification can be produced in batches according to design requirements, the quality detection frequency is large in the production process, and the final H-shaped steel product is high in precision.

Description

Technical Field

[0001] The invention relates to the field of steel structure welding, in particular to a welding method for H-shaped steel used in construction. Background Art

[0002] Steel structure buildings are buildings that use steel plates or steel sections to replace reinforced concrete structures. Their strength and earthquake resistance are greatly improved. Steel structures can be manufactured in factories and installed on site, which greatly reduces the construction period. Steel can be reused, which greatly reduces construction waste. H-shaped steel mainly plays the role of connecting beams in steel structures. The specifications of H-shaped steel correspond to the size and dimensions of the building, which makes the variety of H-shaped steel more and the quantity required for each building is inconsistent. Therefore, the size of H-shaped steel varies according to the specifications of the required building. Therefore, most H-shaped steels are welded after cutting steel plates. The plates of H-shaped steel include webs and wing plates on both sides. After welding, the H-shaped steel is dragged to the site for assembly. However, the existing H-shaped steel welding accuracy is poor, which affects the parameters of steel structure buildings. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and provide a method for welding H-shaped steel for construction.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for welding H-shaped steel for construction, comprising the following steps:

[0006] (1) T-shaped assembly of plates: The flanges cut by the cutting machine are placed on the roller frame for appearance inspection, and then the webs are placed vertically and supported by the assembly machine so that the webs and flanges form a T-shaped structure. Then, the relative positions of the webs and flanges are fixed by spot welding, and then the T-shaped steel is lifted off the roller frame for inspection;

[0007] (2) H-shaped assembly of plates: Place the other wing plate on the roller frame for inspection, then drop the T-shaped steel upside down on the wing plate, and use the assembly machine to support the T-shaped steel so that the wing plate and the T-shaped steel form an H-shaped structure, then fix them by spot welding, and then lift the H-shaped steel off for inspection;

[0008] (3) Bottom welding: Place the H-shaped steel web in parallel on the platform, assemble the arc-starting plate and arc-extinguishing plate at both ends of the H-shaped steel, and perform welding from the middle to both sides by means of segmented back-welding. After welding, check the assembly status;

[0009] (4) Submerged arc welding: After passing the inspection, adjust the position of the welding nozzle so that the angle between the welding nozzle and the web is 40-45°, and then perform welding;

[0010] (5) H-beam correction: After welding, the H-beam is corrected by a correction machine to make it meet the design requirements;

[0011] (6) End milling: Mill the ends of the H-beam to make the specifications of the H-beam consistent;

[0012] (7) Stiffener plate welding: Stiffener plate welding is performed on the web to prevent deformation of the H-beam.

[0013] The inspection in steps (1) and (2) is to inspect whether the web is vertical compared to the wing and whether the web is located at the centerline of the wing.

[0014] During the spot welding process, the length of the spot welding is 40-50 mm, the interval between adjacent spot welding is 300-500 mm, and the gap between the web and the wing is ≤1 mm. When the gap between the web and the wing is greater than 1 mm, repair welding is required.

[0015] The spot welding process uses carbon dioxide gas as the protective gas.

[0016] The arc striking plate and the arc extinguishing plate have a width greater than 80 mm, a length greater than 150 mm, and a thickness greater than 10 mm.

[0017] When the H-shaped steel is welded, the welding is performed in a diagonal sequence.

[0018] When correcting the H-shaped steel, the correction amount each time is less than 5 mm, and the number of corrections is adjusted according to the deformation amount of the H-shaped steel.

[0019] The spacing between the stiffening plates is 500 mm, and the thickness of the stiffening plates is equal to the thickness of the web.

[0020] The H-beam welding method for construction provided by the present invention has the following beneficial effects:

[0021] (1) It is possible to mass produce H-beams that meet the specifications according to the design requirements, and during the production process, the quality inspection is repeated many times, so that the final H-beam products have high precision;

[0022] (2) The splicing process first uses spot welding, base welding, submerged arc welding, etc. to ensure the stability of welding;

[0023] (3) Through the correction step, the deformation during the processing can be adjusted, further ensuring the accuracy of the H-beam;

[0024] (4) By installing a stiffening plate, welding deformation can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of a flow chart provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Example

[0028] like Figure 1 As shown, the H-beam welding method for construction provided in this embodiment includes an assembly machine, a roller frame, an arc welding machine, a submerged arc welding machine, an end milling machine, etc., and includes the following steps:

[0029] (1) T-shaped assembly of plates: The wing plates cut by the cutting machine are placed on a roller frame for appearance inspection. The appearance inspection is to check the flatness, straightness, joint height and misalignment of the plate, whether the burrs are removed, etc. Then, the wing plates are positioned with a transverse clamping wheel, and then the web plates are placed vertically. The web plates are supported by an assembly machine so that the web plates and the wing plates form a T-shaped structure. At this time, it is necessary to ensure that the spacing between the web plate joint and the wing plate joint is ≥200mm, the splicing length of the wing plates shall not be less than 2 times the plate width, the web plate splicing width shall not be less than 300mm, and the length shall not be less than 600㎜, then spot welding is performed to fix the relative position of the web and the wing plate, the length of the spot welding is 40~50㎜, the interval between adjacent spot welding is 300~500㎜, and the gap between the web and the wing plate is ≤1㎜. When the gap between the web and the wing plate is >1㎜, repair welding is required; then the T-shaped steel is lifted off the roller frame for inspection to check whether the web is in the center position and whether the web and the wing plate are in a vertical state, and the ends are spot welded first after corresponding adjustments. The allowable deviation of the web center offset is less than 2mm, and the flange verticality is less than 3mm.

[0030] (2) H-shaped assembly of plates: Place another flange on the roller frame and repeat the appearance inspection in step (1). Then, drop the T-shaped steel upside down on the flange and use the assembly machine to support the T-shaped steel so that the flange and T-shaped steel form an H-shaped structure. Then fix them by spot welding. The spot welding length is required to be 40-50 mm, the interval between adjacent spot welding is 300-500 mm, and the gap between the web and the flange is ≤1 mm. When the gap between the web and the flange is greater than 1 mm, it is necessary to perform repair welding. Then, the H-shaped steel is lifted off for inspection to check whether the web is in the middle position and whether the web and the flange are in a vertical state. After making corresponding adjustments, the ends are first spot welded. The allowable deviation of the web center offset is less than 2 mm, and the flange verticality is less than 3 mm.

[0031] In order to ensure the welding quality, carbon dioxide gas is used as the shielding gas during spot welding.

[0032] (3) Bottom welding: Place the web of the H-shaped steel in parallel on the platform, and assemble the arc-starting plate and the arc-extinguishing plate at both ends of the H-shaped steel. The width of the arc-starting plate and the arc-extinguishing plate should be greater than 80 mm, the length should be greater than 150 mm, and the thickness should be greater than 10 mm. Perform welding from the middle to both sides by means of segmented back-welding. After welding, check the assembly state. The segmented welding can also be welded by segmented skip welding. Try to use symmetrical welding when welding.

[0033] (4) Submerged arc welding: After passing the inspection, adjust the position of the welding nozzle so that the angle between the welding nozzle and the web is 40-45°, and then weld; if the inspection fails, it is necessary to repair the gap greater than 1mm. When welding the H-beam, the diagonal sequence is used for welding;

[0034] (5) H-beam correction: After welding, the H-beam is corrected by a correction machine to meet the design requirements. When correcting the H-beam, the correction amount is less than 5 mm each time, and the number of corrections is adjusted according to the deformation of the H-beam. When one side is corrected to pass, it is turned 180° and corrected again.

[0035] (6) End milling: mill the ends of the H-beam to make the H-beam specifications consistent. When milling the end faces, use a backing to secure the H-beam;

[0036] (7) Stiffening plate welding: Stiffening plates are welded on the web to prevent deformation of the H-shaped steel. The spacing of the stiffening plates is 500 mm, and the thickness of the stiffening plates is equal to the thickness of the web.

[0037] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention shall be included in the protection scope of the present invention. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the present invention omits the description of known components and processing technologies and processes to avoid unnecessary limitation of the present invention.

Claims

1. A method for welding H-beam for construction, characterized in that: The following steps are involved: (1) T-shaped assembly of plates: The flanges cut by the cutting machine are placed on the roller frame for appearance inspection, and then the webs are placed vertically and supported by the assembly machine so that the webs and flanges form a T-shaped structure. Then, the relative positions of the webs and flanges are fixed by spot welding, and then the T-shaped steel is lifted off the roller frame for inspection; (2) H-shaped assembly of plates: Place the other wing plate on the roller frame for inspection, then drop the T-shaped steel upside down on the wing plate, and use the assembly machine to support the T-shaped steel so that the wing plate and the T-shaped steel form an H-shaped structure, then fix them by spot welding, and then lift the H-shaped steel off for inspection; (3) Bottom welding: Place the H-shaped steel web in parallel on the platform, assemble the arc-starting plate and arc-extinguishing plate at both ends of the H-shaped steel, and perform welding from the middle to both sides by means of segmented back-welding. After welding, check the assembly status; (4) Submerged arc welding: After passing the inspection, adjust the position of the welding nozzle so that the angle between the welding nozzle and the web is 40-45°, and then perform welding; (5) H-beam correction: After welding, the H-beam is corrected by a correction machine to make it meet the design requirements; (6) End milling: Mill the ends of the H-beam to make the specifications of the H-beam consistent; (7) Stiffener plate welding: Stiffener plate welding is performed on the web to prevent deformation of the H-beam.

2. The H-beam welding method for construction according to claim 1, characterized in that: The inspection in steps (1) and (2) is to inspect whether the web is vertical compared to the wing and whether the web is located at the centerline of the wing.

3. The H-beam welding method for construction according to claim 1, characterized in that: During the spot welding process, the length of the spot welding is 40-50 mm, the interval between adjacent spot welding is 300-500 mm, and the gap between the web and the wing is ≤1 mm. When the gap between the web and the wing is greater than 1 mm, repair welding is required.

4. The H-beam welding method for construction according to claim 1, characterized in that: The spot welding process uses carbon dioxide gas as the protective gas.

5. The H-beam welding method for construction according to claim 1, characterized in that: The arc striking plate and the arc extinguishing plate have a width greater than 80 mm, a length greater than 150 mm, and a thickness greater than 10 mm.

6. The method for welding H-beam for construction according to claim 1, characterized in that: When the H-shaped steel is welded, the welding is performed in a diagonal sequence.

7. The H-beam welding method for construction according to claim 1, characterized in that: When correcting the H-shaped steel, the correction amount each time is less than 5 mm, and the number of corrections is adjusted according to the deformation amount of the H-shaped steel.

8. The method for welding H-beam for construction according to claim 1, characterized in that: The spacing between the stiffening plates is 500 mm, and the thickness of the stiffening plates is equal to the thickness of the web.

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