Continuous rolling welding method for steel formwork U-shaped profile

Abstract

The invention relates to the field of steel processing, and particularly discloses a steel template U-shaped section bar continuous rolling welding method which comprises the following steps: S1, synchronous feeding: synchronously feeding a base material A, a base material B and a base material C which form a U-shaped section bar into rolling equipment through a multi-channel continuous feeding device; s2, rolling forming: pre-rolling the base material A and the base material C in rolling equipment to form an edge 90-degree bending structure, and meanwhile, keeping the base material B in a straight state so as to preliminarily form a U-shaped outline; through a differential material selection strategy, the A / C side plates are made of 750MPa high-strength steel, it is ensured that no cracking is caused when 90-degree bending is conducted, the B bottom plate is made of 1100MPa ultrahigh-strength steel, and the overall bending strength is improved; the industrial problem that the formability and the strength of high-strength steel cannot be obtained at the same time is thoroughly solved, and the concrete supporting reliability is remarkably enhanced; double-welding-seam synchronous laser welding is innovatively adopted, a seamless interface is formed after the two plates are spliced, the risk of concrete slurry leakage is avoided, and meanwhile the production speed is greatly increased.

Description

Technical Field

[0001] The invention belongs to the field of steel processing, in particular to a continuous roll-pressing welding method for a steel template U-section material. Background Art

[0002] In construction, especially in projects involving concrete pouring, steel formwork plays a vital role as temporary support structures. They not only need to provide a stable support environment for concrete to form the desired shape during the solidification process, but also possess the strength and durability to withstand the various loads and environmental influences during construction. Steel formwork U-profiles, a common structural form, are widely used in construction due to their excellent mechanical properties and ease of fabrication.

[0003] With the continuous advancement of construction technology, the performance requirements for steel formwork U-profiles are becoming increasingly stringent. On the one hand, U-profiles must possess sufficient strength and bending resistance to withstand the various loads during construction; on the other hand, they must also exhibit good formability to meet the demands of complex building structures. However, traditional high-strength steel often suffers from insufficient elongation during the forming process, making it difficult to meet complex forming requirements such as 90° bends. While the use of ultra-high-strength steel with low elongation can improve bending strength, it also increases forming difficulty and joint gaps, affecting the overall performance and service life of the U-profile.

[0004] Existing methods for fabricating U-profiles using steel formwork have significant drawbacks in addressing the contradiction between high-strength steel forming and strength. Traditional methods often struggle to achieve both strength and good formability, resulting in large joint gaps that compromise the U-profile's overall sealing and load-bearing capacity. This not only reduces the efficiency of the U-profile but also increases safety risks and subsequent maintenance costs during construction. Therefore, it is crucial to develop a novel method that can simultaneously address the contradiction between high-strength steel forming and strength, improving both the efficiency and performance of U-profile fabrication. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a continuous roll welding method for steel template U-profiles to solve the problems in the prior art that high-strength steel is difficult to form, the splicing gap is obvious, and it is difficult to balance the strength and forming performance of the U-profiles.

[0006] A method for continuous roll welding of steel template U-profiles comprises the following steps:

[0007] S1. Synchronous feeding: The A base material, B base material and C base material constituting the U-profile are synchronously fed into the roller pressing equipment through a multi-channel continuous feeding device;

[0008] S2. Roll forming: Pre-rolling substrates A and C in a rolling device to form a 90° bend structure at the edge, while keeping substrate B in a straight state, thereby initially forming a U-shaped profile;

[0009] S3, welding forming: using laser welding to continuously weld the joints of substrates A and B, and substrates B and C, formed in step S2; during the welding process, the welding current, welding voltage, and welding speed are monitored and dynamically adjusted in real time;

[0010] S4, anti-corrosion treatment: zinc supplementation treatment is performed on the welding area formed in step S3.

[0011] Preferably, in step S2, the pre-rolling of substrates A and C is performed simultaneously, and the 90° bending is completed in the same rolling station or in consecutive rolling stations, while ensuring that substrate B is not affected by the bending force and remains straight.

[0012] Preferably, in step S3, the welding current adjustment range is 150A to 250A, the welding voltage adjustment range is 22V to 28V, and the welding speed is 10-20m / min.

[0013] Preferably, in step S4, the thickness of the zinc layer formed by the zinc supplementation treatment is 80 μm to 120 μm.

[0014] Preferably, the multi-channel continuous feeding device in step S1 includes a guiding mechanism to ensure that the spacing tolerance of the A, B, and C substrates is maintained at ≤0.5 mm before entering the roller pressing device.

[0015] Preferably, a pre-welding cleaning process is added before welding in step S3: high-pressure gas is used to blow out the areas to be welded at the AB junction and the BC junction.

[0016] Preferably, a weld inspection process is added after welding in step S3: continuous defect scanning of the welding area is performed using an ultrasonic flaw detector.

[0017] Preferably, the zinc supplementation treatment in step S4 adopts a hot-dip galvanizing process, and the temperature of the zinc solution is controlled at 450±10°C.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] Through a differentiated material selection strategy, the A / C side panels are made of 750MPa high-strength steel, ensuring crack-free 90° bending. The B bottom panel is made of 1100MPa ultra-high-strength steel, improving overall bending strength. This completely solves the industry's dilemma of high-strength steel's compromise between formability and strength, significantly enhancing the reliability of concrete supports.

[0020] The innovative use of double-seams synchronous laser welding forms a seamless interface after the two plates are spliced ​​together, avoiding the risk of concrete leakage and greatly improving production speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 As shown:

[0024] Embodiment 1: The present invention provides a method for continuous roll welding of a steel template U-profile, comprising the following steps:

[0025] S1. Synchronous feeding: The A base material, B base material and C base material constituting the U-profile are synchronously fed into the roller pressing equipment through a multi-channel continuous feeding device;

[0026] Among them, the substrate specifications are as follows:

[0027] A / C substrate: thickness 1.5mm, width 50mm, B substrate: thickness 1.5mm, width 300mm;

[0028] The A / C substrate uses 750MPa high-strength steel, and the B substrate uses 1100MPa ultra-high-strength steel, which allows the A / C substrate to retain sufficient elongation to meet the 90° bending requirement. The B substrate uses ultra-high-strength steel with low elongation, which greatly improves the overall bending strength.

[0029] The multi-channel continuous feeding device uses three sets of independent servo motors to drive the feeding rollers;

[0030] S2. Roll forming: Pre-rolling substrates A and C in a rolling device to form a 90° bend structure at the edge, while keeping substrate B in a straight state, thereby initially forming a U-shaped profile;

[0031] The A / C substrates are rolled to form a 90° bent structure at the edge, and the B substrate is rolled to make it straight, ensuring that the A / C substrates are located on both sides of the B substrate respectively;

[0032] S3, welding forming: using laser welding to continuously weld the joints of substrates A and B, and substrates B and C, formed in step S2; during the welding process, the welding current, welding voltage, and welding speed are monitored and dynamically adjusted in real time;

[0033] Among them, a laser welding head is used to perform double-seam simultaneous welding on the AB / BC joint. The dynamic parameters during the welding process are as follows:

[0034] The current is 200A, the voltage is 22V, and the substrate travel speed is 10m / min;

[0035] By using laser welding, the splicing gap can be made ≤0.15mm.

[0036] S4, anti-corrosion treatment: zinc supplementation treatment is performed on the welding area formed in step S3, so that the zinc layer reaches 80 μm.

[0037] The steel formwork U-profile prepared by the present invention is suitable for providing temporary support for concrete during the construction of buildings such as houses to ensure that it forms the design shape after solidification. It solves the contradiction between the forming and strength of high-strength steel, uses laser welding to eliminate splicing gaps, and greatly improves production efficiency.

[0038] Example 2: The present invention provides a method for continuous roll welding of steel template U-profiles, the specific steps of which are as follows:

[0039] S1, synchronous feeding:

[0040] A multi-channel continuous feeding device, including a guide mechanism, uses three independent servo motors to drive the feed rollers, simultaneously feeding the U-profiles—base material A (2mm thick, 60mm wide, made of 800MPa high-strength steel), base material B (2mm thick, 400mm wide, made of 1200MPa ultra-high-strength steel), and base material C (same specifications as base material A)—into the roller-forming equipment. The guide mechanism ensures that the spacing between base materials A, B, and C is maintained within a tolerance of ≤0.5mm before entering the roller-forming equipment, paving the way for subsequent precise rolling and welding.

[0041] S2, Roll Forming:

[0042] In the rolling equipment, substrates A and C are pre-rolled simultaneously. The edges of substrates A and C are bent 90° at the same rolling station or in successive rolling stations, while substrate B is protected from bending forces and remains straight, thus initially forming a U-shaped profile.

[0043] S3, welding forming:

[0044] Cleaning before welding: Before welding, a cleaning process is added, using high-pressure gas to purge the areas to be welded at the AB joint and BC joint to remove surface impurities and dust to ensure welding quality.

[0045] Laser welding: A laser welding head was used to continuously weld the AB and BC joints. During the welding process, welding parameters were monitored and adjusted dynamically in real time. The welding current was 250A, the welding voltage was adjusted to 28V, and the welding speed was 20m / min.

[0046] Weld seam inspection: After welding is completed, a weld seam inspection process is added. The welding area is continuously scanned for defects using an ultrasonic flaw detector to promptly detect and address possible welding defects and ensure that the welding quality meets the requirements.

[0047] S4. Anticorrosion treatment:

[0048] The welded area formed in step S3 is zinc-coated using a hot-dip galvanizing process. The zinc bath temperature is controlled at 450±10°C, so that the zinc layer thickness reaches 120μm, effectively improving the corrosion resistance of the U-profile and extending its service life.

[0049] The steel formwork U-profile prepared through the above embodiment not only solves the contradiction between the forming and strength of high-strength steel, but also realizes the effective control of the splicing gap. At the same time, it has good anti-corrosion performance and is suitable for providing temporary support for concrete during the construction of buildings such as houses to ensure that it forms the shape required by the design after solidification.

[0050] All standard parts used in the present invention can be purchased commercially, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. In addition, the circuit connections adopt conventional connection methods in the prior art and will not be described in detail here. Any matters not described in detail in this specification belong to the prior art known to professionals in this field.

[0051] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0052] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0055] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0056] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for continuous roll welding of steel template U-profiles, characterized in that: The following steps are involved: S1. Synchronous feeding: The A base material, B base material and C base material constituting the U-profile are synchronously fed into the roller pressing equipment through a multi-channel continuous feeding device; S2. Roll forming: Pre-rolling substrates A and C in a rolling device to form a 90° bend structure at the edge, while keeping substrate B in a straight state, thereby initially forming a U-shaped profile; S3, welding forming: using laser welding to continuously weld the joints of substrates A and B, and substrates B and C, formed in step S2; during the welding process, the welding current, welding voltage, and welding speed are monitored and dynamically adjusted in real time; S4, anti-corrosion treatment: zinc supplementation treatment is performed on the welding area formed in step S3.

2. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: In step S2, the pre-rolling of substrates A and C is performed simultaneously, and the 90° bending is completed in the same rolling station or in consecutive rolling stations, while ensuring that substrate B is not affected by the bending force and remains straight.

3. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: In step S3, the welding current is adjusted in the range of 150A to 250A, the welding voltage is adjusted in the range of 22V to 28V, and the welding speed is 10-20m / min.

4. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: In step S4, the zinc layer formed by the zinc supplementation treatment has a thickness of 80 μm to 120 μm.

5. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: In step S1 , the multi-channel continuous feeding device includes a guide mechanism to ensure that the spacing tolerance of substrates A, B, and C is maintained at ≤0.5 mm before entering the roller pressing device.

6. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: In step S3, a pre-welding cleaning process is added before welding: high-pressure gas is used to purge the areas to be welded at the AB junction and the BC junction.

7. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: Step S3: After welding, a weld inspection process is added: the weld area is continuously scanned for defects using an ultrasonic flaw detector.

8. A method for continuous roll welding of steel template U-profiles according to claim 1, characterized in that: The zinc supplementation treatment in step S4 adopts a hot-dip galvanizing process, and the temperature of the zinc solution is controlled at 450±10°C.

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