Method for joining steel material, joint member, and joint structure

Abstract

[Problem] To propose a simple on-site construction method excellent in temporary fixing properties for joining steel materials using an adhesive. [Solution] Provided is a joining method that provides temporary fixation using a neodymium magnet when joining steel materials by adhering a steel material (B) to a steel material (A) using an adhesive.

Description

Steel joining method, joining material, and joining structure

[0001] The present invention relates to a method for joining steel materials using an adhesive, and more particularly to a simple on-site construction method that provides excellent temporary fixation when joining steel materials for the purpose of reinforcing and / or stiffening the steel materials.

[0002] There are a wide variety of joining methods for steel materials and steel plates, and their use depends on the steel material type and application. These include welding, mechanical joining (such as caulking, bolting, and riveting), and adhesive bonding. However, while welding provides high joint strength, it has several challenges, including extensive fire prevention work area protection, significant impact on the work environment, potential issues with deformation and distortion at the weld, and the need for skilled workers. Mechanical joining also requires pre-processing of the steel, can reduce structural performance due to cross-sectional defects, and can deform the steel plates during joining, limiting the applicable thickness and location. Adhesive bonding has been addressing traditional issues, such as low joint strength and reliability over time, and is gaining popularity. However, it faces challenges, such as the need for temporary fixing or pressure clamping after construction due to the time required for adhesives to harden.

[0003] Patent Document 1 proposes a solar panel installation method that uses both double-sided tape and adhesive to attach magnets to the panel in advance. However, this method requires a pre-installation process of double-sided tape, which is not only time-consuming but also generates waste from the release paper of the double-sided tape. Patent Document 2 describes a structure in which, when adhering FRP to steel material, the pressing force of a neodymium magnet is used to uniformly thin the adhesive layer thickness after curing, thereby reinforcing the adhesive. However, there is no mention of bonding steel materials together, and the adhesive layer thickness is adjusted to an extremely thin thickness of less than 0.05 mm. Patent Document 3 proposes a construction method in which an adhesive and a magnet are used together when adhering an adherend to a base surface, making it easy to adjust the position of the adherend until the adhesive hardens. However, the method only exemplified methods for finishing interior walls of houses and methods for replacing chalkboards, etc., and does not mention steel materials together. Furthermore, the adhesives exemplified are only modified silicone resin adhesives and architectural caulking materials, and there is no mention of structural adhesives.

[0004] Japanese Patent Laid-Open No. 6-85303 Japanese Patent Laid-Open No. 2017-25620 Japanese Patent Laid-Open No. 2015-174982

[0005] When joining steel materials together using adhesives, particularly when joining steel materials together using adhesives at construction sites or in existing structures, there is a demand for a simple joining method that provides excellent temporary fixation.

[0006] An object of the present invention is to provide a simple joining method that is excellent in temporary fixation when joining steel materials together.

[0007] As a result of intensive research to solve the above problems, the inventors discovered that when joining steel materials together, temporary fixing using a neodymium magnet provides excellent temporary fixation properties and allows for easy joining, and have completed the present invention.

[0008] [Item 1] A method for joining steel materials by bonding steel material (B) to steel material (A) using an adhesive, characterized in that a neodymium magnet is used for temporary fixation. [Item 2] A method for joining steel materials according to Item 1, characterized in that steel material (A) is reinforced and / or stiffened by joining steel material (B). [Item 3] A method for joining steel materials according to Item 1 or 2, characterized in that the adhesive is a structural adhesive. [Item 4] A method for joining steel materials according to Item 1 or 2, characterized in that the steel materials (A) and / or steel materials (B) are steel plates. [Item 5] A method for joining steel materials according to Item 1 or 2, characterized in that the steel materials (A) and / or steel materials (B) are steel plates. [Item 6] A method for joining steel materials according to Item 1 or 2, characterized in that the steel materials (A) and / or steel materials (B) are steel materials selected from H-beams, I-beams, C-beams, T-beams, L-beams, Z-beams, U-beams, square steel pipes, circular steel pipes, square steel, round steel, hexagonal steel, and hat-shaped steel. [Item 6] A method for joining steel materials for installing a brace using the joining method described in item 1 or 2. [Item 7] A method for joining steel materials for installing a knee brace using the joining method described in item 1 or 2. [Item 8] A method for joining steel materials for installing a reinforcing material and / or a stiffening material to steel materials selected from H-shaped steel, C-shaped steel, L-shaped steel, square steel pipe, circular steel pipe, and steel plate using the joining method described in item 1 or 2. [Item 9] A method for joining steel materials for installing a gusset plate and / or a rib plate using the joining method described in item 1 or 2. [Item 10] A method for joining steel materials for repair with a backing plate using the joining method described in item 1 or 2. [Item 11] A method for joining steel materials for fixing a deck plate using the joining method described in item 1 or 2. [Item 12] A method for joining steel materials in which the plastic deformation capacity of steel material (A) is improved by joining steel material (B) using the joining method described in item 1 or 2. [Item 13] A joined member in which a steel material (A) and a steel material (B) are joined using the joining method according to item 1 or 2. [Item 14] A joined structure in which a steel material (A) and a steel material (B) are joined using the joining method according to item 1 or 2.

[0009] The present invention provides excellent temporary fixing properties and allows for easy construction when joining steel materials, particularly when joining new steel materials that provide reinforcement and / or stiffening effects to steel materials at construction sites or in existing structures. This method can be easily applied not only to horizontal surfaces, but also to slopes, vertical surfaces, ceiling surfaces, etc.

[0010] (a) and (b) are diagrams for explaining Example 1; (a) and (b) are diagrams for explaining Example 2; (a) and (b) are diagrams for explaining Example 3; (a) and (b) are diagrams for explaining Example 4; (a) and (b) are diagrams for explaining Example 5; (a) and (b) are diagrams for explaining Example 6; (a) and (b) are diagrams for explaining Example 7; (a) and (b) are diagrams for explaining Comparative Example 1.

[0011] This is a method for joining steel materials by bonding steel material (B) to steel material (A) with an adhesive, characterized in that the steel materials are temporarily fixed using a neodymium magnet.

[0012] <Steel Material (A) and Steel Material (B)> Any steel material containing iron as a main component can be used as the steel material (A) and / or the steel material (B), including pure iron, carbon steel, and alloy steel. Among these, carbon steel is particularly preferred, and examples of carbon steel include SPC, SS, SC, SK, SM, and SB materials depending on the carbon content. These steel materials may be painted or plated to the extent that they can be temporarily fixed with a neodymium magnet. Furthermore, to improve the adhesive strength of the adhesive, black scale (mill scale) on the surface of the steel material may be removed, or a primer may be applied to the joining surface.

[0013] The shape of the steel material is preferably a steel plate (plate material) or structural steel, and examples of structural steel include H-shaped steel, I-shaped steel, C-shaped steel, T-shaped steel, L-shaped steel, Z-shaped steel, U-shaped steel, square steel pipe, circular steel pipe, square steel, round steel, hexagonal steel, hat steel, etc., but are not limited to these.

[0014] <Neodymium Magnet> The neodymium magnet used for temporary fixing is a magnet containing neodymium (Nd), such as a sintered body primarily composed of neodymium, iron, and boron. An example of the neodymium magnet's composition is 60-70% by mass of iron (Fe), 23-30% by mass of neodymium (Nd), 2-10% by mass of dysprosium (Dy), and 1% by mass of boron (B). Dysprosium need not be added. Neodymium magnets with different composition ratios may be used to improve magnetic or mechanical properties, or may contain elements other than those included in the composition ratios. Resin-bonded magnets using neodymium magnet powder as one of the raw materials may also be used. Neodymium magnets are cheaper to procure than samarium-cobalt magnets or aluminum-nickel-cobalt magnets (alnico magnets), and have the advantage of being easier to process into smaller, thinner magnets due to their stronger magnetic force compared to ferrite magnets.

[0015] The shape of the neodymium magnet is not particularly limited. For example, it may be a hexahedron such as a cube, rectangular parallelepiped, or flat plate, or it may be a circular shape such as a disk, cylinder, or doughnut shape. It may also be cylindrical, rectangular, spherical, or a pyramid such as a triangular or square pyramid. It may also be a segmented type with a curved fan-shaped cross section. It may also be a flat plate or disk with a screw hole or countersunk screw hole formed in the center. The screw hole or countersunk screw hole may have multiple holes. These may also be used with protrusions.

[0016] The thickness of the neodymium magnet can be determined according to the desired thickness, but is preferably 0.1 mm to 50 mm, more preferably 0.2 mm to 20 mm, and even more preferably 0.3 mm to 5 mm. If it is thinner than 0.1 mm, the neodymium magnet will be prone to cracking and difficult to handle, and it will be difficult to adequately adjust the coating thickness. Furthermore, if it is thicker than 50 mm, a large amount of adhesive will be required, which is economically disadvantageous.

[0017] The size of the neodymium magnet can be determined according to the size and shape of the members to be bonded together, but is preferably 0.01 mm to 1,000,000 mm, and more preferably 1 mm to 10,000 mm. If it is smaller than 0.01 mm, it will be too small and difficult to handle, and if it is larger than 1,000,000 mm, it will be too heavy and difficult to handle, and it will also be economically disadvantageous.

[0018] The neodymium magnet can be used in any direction of magnetization, such as vertical, horizontal, or with two poles on one side, but it is preferable to use one that is manufactured to be economical.

[0019] The surface of the neodymium magnet may be surface treated as long as it does not impair its temporary fixing function. For example, because neodymium magnets are relatively weak against impact and prone to cracking, they can be coated or plated with resin or metal to form a protective layer. These surface treatments can also impart rust prevention properties to the magnet. Nickel plating is particularly preferred from the perspective of rust prevention.

[0020] <Adhesive> The adhesive used in the present invention is not particularly limited, and a general adhesive can be used, but structural adhesives are preferred because they have high adhesive strength and excellent reliability. Structural adhesives are defined in JIS K 6800, Adhesive and Bonding Terminology, as "reliable adhesives that can withstand large loads for long periods of time," and epoxy-based adhesives, acrylic-based adhesives, urethane-based adhesives, etc. are commonly used. These structural adhesives have high adhesive strength and are suitable for joining steel materials, but among these, adhesives that have the ability to allow the adhesive joint to follow large displacements, i.e., so-called toughness, are preferred.

[0021] As a structural adhesive, it is necessary for the adhesive to be "an adhesive that can withstand large loads for a long period of time," and therefore the tensile shear bond strength must be 5 N / mm2 or more, preferably 10 N / mm2 or more, more preferably 15 N / mm2 or more, and even more preferably 20 N / mm2 or more. Furthermore, in the fields of construction and civil engineering, where heating on site is difficult, an adhesive that cures quickly at room temperature (25°C ± 5°C) is preferred. More preferably, an adhesive that develops an adhesive strength of 80% or more of its final strength within 24 hours at room temperature (25°C ± 5°C) is preferred.

[0022] <Joining Method> The method of joining steel materials using a neodymium magnet for temporary fixation and an adhesive according to the present invention may be any method that achieves the desired purpose. However, for temporary fixation, it is necessary to place the neodymium magnet between the steel materials (A) and (B). Placing the neodymium magnet on the outside of either the steel material (A) or the steel material (B) results in insufficient temporary fixing strength. For example, the joining method may involve affixing a neodymium magnet to one of the steel materials (A), applying an adhesive to the steel material (A), and then bonding the steel material (B). Alternatively, the adhesive may be applied to the steel material (B) and then bonding the steel material (A) to which the neodymium magnet is attached. Conversely, the neodymium magnet may be affixed to the steel material (B), and then bonding the steel material (B) to the adhesive-applied steel material (A), or the adhesive may be applied to the steel material (B) to which the neodymium magnet is attached, and then bonding the steel material (B) to the steel material (A). Depending on the type and usage of the adhesive, the adhesive may be applied to both the steel materials (A) and (B).

[0023] If the temporary fixation by the neodymium magnet is insufficient, the temporary fixation can be further reinforced by placing a heavy object on the joined steel materials, or by using various methods such as clips, adhesive tape, a vice, bolts, welding, etc. Furthermore, when the bonding strength is additionally increased by bolting, welding, rivets, drill screws, etc. in addition to the adhesive bonding, the additional force can be applied regardless of whether the temporary fixation by the neodymium magnet is sufficient or insufficient.

[0024] The number and location of neodymium magnets are not limited as long as the desired temporary fixing performance is achieved. This is determined appropriately based on the size, shape, and magnetic force of the magnets and the size, shape, and rigidity of the steel material. However, it is preferable to use multiple neodymium magnets of the same thickness within the same plane. If there are unevennesses on the joining surface between the steel materials, neodymium magnets of different thicknesses can be used to eliminate the unevenness, or in some cases, multiple neodymium magnets can be stacked to achieve the desired thickness. When only one neodymium magnet is installed, it is preferable to install it in the center of the joining surface, and it is preferable that the neodymium magnet have as large an area as possible. Generally, it is preferable to install multiple neodymium magnets, and in this case, they are preferably installed at the edge of the area where the adhesive is applied. If the rigidity of the steel material is low and the areas without neodymium magnets bend, preventing the required adhesive thickness from being maintained, neodymium magnets are required as spacers in the bent areas as well.

[0025] <Applications> The method for joining steel materials of the present invention can provide a simple joining method with excellent temporary fixation properties, and therefore can be used in a variety of fields, including various electrical and electronic fields, automobiles, airplanes, ships, motorcycles, trains, machinery, buildings, civil engineering, office supplies, and household goods. In particular, when applied to construction sites or existing structures, the method is particularly suitable because it often requires inexpensive and simple joining during on-site work. Examples of applications include, but are not limited to, attaching reinforcing members and / or stiffening members to steel materials to improve their rigidity, strength, or yield strength, or to improve their plastic deformation capacity, installing earthquake-resistant or vibration-damping braces on pillars or beams, and attaching repair plates to steel structures such as bridges.

[0026] [Brace installation] This joining method is applied to the installation of braces. A brace is a reinforcing material inserted diagonally into a rectangular frame, also known as a "bracing beam." Applicable braces include earthquake-resistant braces, seismic control braces with built-in dampers, and buckling-restrained braces. When attaching braces to columns or beams using adhesive, neodymium magnets are used to temporarily fix them, eliminating the need for clamping jigs and the need to remove the clamping jigs after the adhesive has hardened. Furthermore, the neodymium magnets act as spacers, making it possible to maintain a consistent thickness and increasing the reliability of the joint.

[0027] [Installation of knee braces] This joining method is applied to the installation of knee braces. A knee brace is a component that is inserted diagonally into the joint between a column and a cross member, or between two cross members, connecting the middle of the materials. It prevents the attached part from being deformed by earthquakes or wind pressure. When attaching knee braces to columns or beams with adhesive, neodymium magnets are used to temporarily fix them at the joint, eliminating the need for a clamping jig and the need to remove the clamping jig after the adhesive has hardened. The neodymium magnet also acts as a spacer, making it possible to maintain a consistent thickness and increasing the reliability of the joint.

[0028] [Installation of Reinforcement and / or Stiffening Materials in Steel Materials] This joining method is applicable to the installation of reinforcement and / or stiffening materials in steel materials. The reinforcement and / or stiffening materials are not particularly limited as long as they reinforce and / or stiffen the steel material. Examples include stiffeners placed on the web surface of H-shaped steel to prevent buckling, or reinforcing and / or stiffening plates on the flange surface. Since stress concentrates at the beam end of H-shaped steel used as a beam, it is preferable to reinforce and / or stiffen the beam end. A reinforcement and / or stiffening method using adhesives that apply temporary fixation using neodymium magnets is a particularly preferred joining method for existing structures, as it does not require processing of the steel material and does not pose the risk of fire that can occur with welding. When attaching reinforcement and / or stiffening materials to steel materials using adhesives, temporary fixation using neodymium magnets at the joint eliminates the need for processes such as fixing with a clamping jig and removing the clamping jig after the adhesive has hardened. In addition, the neodymium magnet acts as a spacer, making it possible to maintain a constant thickness and increasing the reliability of the joint.

[0029] [Installation of Gusset Plates and / or Rib Plates] This joining method is applicable to the installation of gusset plates and / or rib plates. A gusset plate is a support plate attached to steel materials (e.g., H-shaped steel) when joining a sub-beam to a main beam or column in a structure. A rib plate is a reinforcing plate installed on the opposite side of the gusset plate. When attaching gusset plates and / or rib plates with adhesive, neodymium magnets are used to temporarily fix them at the joint, eliminating the need for clamping jigs and the need to remove the clamping jigs after the adhesive has hardened. The neodymium magnets also act as spacers, allowing for a consistent thickness to be maintained, increasing the reliability of the joint.

[0030] [Backing Plate Repair] This joining method is applicable to backing plate repair. Backing plate repair is a method of reinforcing and / or stiffening joints by using a steel plate as a backing plate in areas of steel structures, particularly bridges, that have been damaged by corrosion or fatigue cracks. When attaching the steel plate to the damaged area using adhesive, a neodymium magnet is used to temporarily fix the joint, eliminating the need for a clamping jig and the need to remove the clamping jig after the adhesive has hardened. The neodymium magnet also acts as a spacer, making it possible to maintain a consistent thickness and increasing the reliability of the joint.

[0031] [Fixing deck plates] This joining method is applied to the temporary fixing of deck plates. A common construction method for constructing each floor of a steel-framed building, a reinforced concrete building, or a reinforced steel-reinforced concrete building involves laying a steel plate called a deck plate on top of the beams, arranging reinforcing bars on top of that, and then pouring concrete onto the deck plate to construct a reinforced concrete floor structure. When adhesive is used to fix the deck plate to the beams, the process can be simplified by temporarily fixing it at the joint using a neodymium magnet.

[0032] [Members] Various members are provided as members joined using the method of joining steel materials with an adhesive of the present invention, in which the members are temporarily fixed using a neodymium magnet. Furthermore, structures using the members are also provided.

[0033] The present invention will be described in more detail below with reference to the accompanying drawings and examples. It should be noted that these examples are merely illustrative and should not be construed as limiting.

[0034] Example 1 will be described with reference to Figures 1(a) and 1(b). Steel materials (A) and (B) were 1.6 mt x 25 mm x 100 mm SPCC (common cold-rolled steel) plates. The adhesive application area S1 (25 mm x 25 mm) was sandblasted on both sides of steel materials (A) and (B) and then cleaned with solvent to form the adherend surface. Cylindrical neodymium magnets M1 (1 mmt x 2 mmφ) were placed at the four corners of the adhesive area S1 (see Figure 1(a)). The adhesive was placed on a desk with the adherend surface facing up. A room-temperature-curing acrylic structural adhesive (catalog value 22.3 N / mm2) was mixed and applied to the adhesive area S1, and steel material (B) was then bonded to form a joint. Steel materials (A) and (B) were temporarily fixed by the neodymium magnets, eliminating the need for additional clamping tools. Furthermore, the coating thickness was controlled by the thickness of the neodymium magnets.

[0035] Example 2 will be described with reference to Figures 2(a) and (b). SS400 (carbon steel, general structural rolled steel) steel plates measuring 4.5 mm thick x 40 mm thick x 150 mm thick were used as steel materials (A) and (B). The adhesive application area S2 (40 mm x 60 mm) on both sides of steel materials (A) and (B) was sandblasted and then cleaned with a solvent to form the adherend surface. Rectangular neodymium magnets M2 (1 mm thick x 5 mm thick x 30 mm thick, N45) were placed on both ends of the adhesive area S2 of steel material (A), which was then placed on a desk with the adherend surface facing up. A room-temperature-curing acrylic structural adhesive (catalog value 29.2 N / mm²) was mixed and applied to the adhesive area S2, and steel material (B) was then bonded to form a joint. The steel materials (A) and (B) were temporarily fixed by neodymium magnets, no additional clamping tool was required, and the coating thickness was controlled by the thickness of the neodymium magnets.

[0036] Example 3 will be described with reference to Figures 3(a) and (b). SS400 (carbon steel, general structural rolled steel) steel plates measuring 4.5 mm thick x 40 mm thick x 150 mm thick were used as steel materials (A) and (B). The adhesive application area S3 (40 mm x 60 mm) on both sides of steel materials (A) and (B) was sandblasted and then cleaned with a solvent to form the adherend surface. Rectangular neodymium magnets M3 (3 mm thick x 6 mm thick x 12 mm thick, N40) were placed on both ends of the adhesive area S3 of steel material (A), which was then placed on a desk with the adherend surface facing up. A room-temperature-curing acrylic structural adhesive (catalog value 22.3 N / mm²) was mixed and applied to the adhesive area S3, and steel material (B) was then bonded to form a joint. The steel materials (A) and (B) were temporarily fixed by neodymium magnets, no additional clamping tool was required, and the coating thickness was controlled by the thickness of the neodymium magnets.

[0037] Example 4 Example 4 will be described with reference to Figure 4. A bonded structure was produced in the same manner as in Example 3, except that when applying the adhesive, a support H (10 mmt x 35 mm x 50 mm) having a three-dimensional knitted structure was placed in the bonding area, and a room-temperature curing acrylic structural adhesive (catalog value 22.3 N / mm2) was injected and impregnated into the support. Steel materials (A) and (B) were temporarily fixed in place by neodymium magnets, eliminating the need for an additional clamping jig to suppress the repulsive force of the support, and the coating thickness was controlled by the thickness of the neodymium magnet.

[0038] Example 5 will be described with reference to Figure 5. SS400 (carbon steel, general structural rolled steel) steel plates measuring 3.2 mm thick x 25 mm x 100 mm were used as steel materials (A) and (B). The adhesive application area S5 (25 mm x 25 mm) of steel material (A) was left unsandblasted and used as the adherend surface, with the black surface still attached. Steel material (A) was placed so that the adhesive application area S5 was vertical. Rectangular parallelepiped neodymium magnets M50 (2 mm thick x 5 mm x 25 mm, N40) and M51 (3 mm thick x 5 mm x 25 mm, N40) were placed on both ends of the adhesive application area S5 so that the application thickness was 5 mm. The neodymium magnets were easily applied to vertical surfaces and did not slide off or peel off. A room-temperature curing urethane structural adhesive (catalog value 25 N / mm2) was mixed and applied to the adhesive area S5, and steel material (B) was attached to create a joint. Steel materials (A) and (B) were temporarily fixed in place with neodymium magnets, so no additional clamping tools were required, and the thickness of the adhesive was controlled by the thickness of the neodymium magnet.

[0039] Example 6: Example 6 will be described with reference to Figure 6. SS400 (carbon steel, general structural rolled steel) steel plates measuring 4.5 mm thick x 40 mm thick x 150 mm thick were used as steel materials (A) and (B). The adhesive application area S6 (40 mm thick x 50 mm thick) of steel material (A) was left unsandblasted and left as a black surface. Steel material (A) was positioned so that adhesive area S6 was vertical, and two disk-shaped neodymium magnets M6 (0.3 mm thick x 10 mm diameter) were placed approximately in the center of both ends of adhesive area S6. The neodymium magnets M6 were easily installed on the vertical surface and did not slip off or peel off. A room-temperature-curing acrylic structural adhesive (catalog value 22.3 N / mm²) was mixed and applied to adhesive area S6, and steel material (B) was bonded to produce a joint. The steel materials (A) and (B) were temporarily fixed by neodymium magnets, no additional clamping tool was required, and the coating thickness was controlled by the thickness of the neodymium magnets.

[0040] Example 7: Example 7 will be described with reference to Figure 7. SS400 (carbon steel, general structural rolled steel) steel plates measuring 3.2 mm thick x 25 mm x 100 mm were used as steel materials (A) and (B). The adhesive application area S7 (25 mm x 25 mm) of steel material (A) was left unsandblasted, leaving the black surface intact. Two rectangular neodymium magnets M7 (1 mm thick x 5 mm x 20 mm, N40) were placed on top of each other at approximately the center of both ends of the adhesive application area S7 to achieve a coating thickness of 2 mm. A room-temperature-curing acrylic structural adhesive (catalog value 29.2 N / mm²) was mixed and applied to the adhesive application area S7, and steel material (B) was bonded to produce a joint. Steel materials (A) and (B) were temporarily fixed by the neodymium magnets, eliminating the need for additional clamping tools. Furthermore, the coating thickness was controlled by the thickness of the neodymium magnets.

[0041] Comparative Example 1 will be described with reference to Figure 8. Instead of a neodymium magnet, a rectangular parallelepiped ferrite magnet M108 (4 mm thick x 10 mm thick x 30 mm thick) was used and placed approximately at the center of both ends of the adhesive area S104 (40 mm thick x 50 mm thick) so that the applied thickness was 4 mm. The ferrite magnet was easily applied even to vertical surfaces and did not slide off or peel off. A room-temperature curing urethane structural adhesive (catalog value 25 N / mm²) was mixed and applied to the adhesive area S104, and an attempt was made to bond steel material (B) to produce a bonded structure. However, the bonded steel material (B) slid off and could not be temporarily fixed, so a bonded structure could not be produced.

[0042] From the above examples, it can be seen that when joining steel materials using adhesive, temporary fixing using neodymium magnets allows for easy construction and the thickness of the adhesive to be controlled. Neodymium magnets can be easily installed not only on horizontal surfaces, but also on vertical, inclined, curved, and ceiling surfaces, eliminating the need for clamping or temporary fixing using a fixing jig. Furthermore, since neodymium magnets can be fixed by overlapping them, unevenness on site can be easily addressed.

Claims

1. A method for joining steel materials by bonding steel material (B) to steel material (A) using an adhesive, characterized in that the steel materials are temporarily fixed using a neodymium magnet.

2. A method for joining steel materials according to claim 1, characterized in that the steel material (A) is reinforced and / or stiffened by joining the steel material (B).

3. A method for joining steel materials according to claim 1 or 2, characterized in that the adhesive is a structural adhesive.

4. A method for joining steel materials according to claim 1 or 2, characterized in that the steel material (A) and / or the steel material (B) is a steel plate.

5. A method for joining steel materials according to claim 1 or 2, characterized in that the steel material (A) and / or steel material (B) is a steel material selected from H-shaped steel, I-shaped steel, C-shaped steel, T-shaped steel, L-shaped steel, Z-shaped steel, U-shaped steel, square steel pipe, circular steel pipe, square steel, round steel, hexagonal steel, and hat-shaped steel.

6. A method for joining steel materials to install braces using the joining method described in claim 1 or 2.

7. A method for joining steel materials in which knee braces are installed using the joining method described in claim 1 or 2.

8. A method for joining steel materials, using the joining method described in claim 1 or 2, to install reinforcing and / or stiffening materials for steel materials selected from H-shaped steel, C-shaped steel, L-shaped steel, square steel pipes, circular steel pipes, and steel plates.

9. A method for joining steel materials, in which a gusset plate and / or a rib plate is installed, using the joining method according to claim 1 or 2.

10. A method for joining steel materials, in which the joining method according to claim 1 or 2 is used to repair the steel materials using a patch plate.

11. A method for joining steel materials to fix a deck plate using the joining method described in claim 1 or 2.

12. A method for joining steel materials according to claim 1, characterized in that the plastic deformation capacity of steel material (A) is improved by joining steel material (B).

13. A joined member in which steel material (A) and steel material (B) are joined using the joining method described in claim 1 or 2.

14. A joining structure in which steel material (A) and steel material (B) are joined using the joining method described in claim 1 or 2.

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