JP3194308B2 - Joining method of steel pipe and diaphragm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a steel pipe or a steel pipe of a joint part constituting a pillar of an architectural structure or a civil engineering structure to a beam joining diaphragm.

[0002]

2. Description of the Related Art Conventionally, in order to obtain complete penetration, a steel pipe or a connection part steel pipe and a beam connecting diaphragm are usually provided with a groove in the steel pipe, and the root interval is reduced. The method of opening by about mm and joining by back welding using fusion welding is adopted.

[0003] In addition, as a method of joining strips such as reinforcing bars, pipes, steel bars, sections, etc., liquid phase diffusion welding using an amorphous metal insert material is mainly intended to eliminate the swelling of joints in gas pressure welding. A joining method by a legal method has been developed (JP-A-2-75478, JP-A-2-2-2).
No. 41677).

[0004]

In the conventional welding method for forming a groove in a conventional shape, it is troublesome to machine the groove at the end of the steel pipe and attach a backing metal, and it is necessary to maintain a route interval. Become.

[0005] Further, after welding is completed, not only the appearance of welding is increased at the joint portion between the diaphragm and the steel pipe and the appearance is poor, but also the presence of the welding excess may interfere with beam joining.

Further, in the conventional joining method, since the groove is filled with the molten metal, when this solidifies, welding shrinkage inevitably occurs.

The present invention is intended to solve the above-mentioned problems by applying a liquid phase diffusion bonding method to a steel pipe and a diaphragm. It is an object of the present invention to provide a joining method that omits the attachment of the wire and the maintenance of the route interval, has little welding margin, and has almost no welding shrinkage.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method of joining a steel pipe or a steel pipe at a connection part to a diaphragm for beam joining, which comprises a column, wherein a flat joining surface is formed at an end of the steel pipe.
Insert a thin-film amorphous metal insert between the joint surface of the steel pipe and the joint surface of the diaphragm,
A steel pipe and a diaphragm are joined by a liquid phase diffusion joining method.

In the case of a square steel pipe column, the connection steel pipe is made of a short rectangular steel pipe, and in the case of a round steel pipe column, the connection steel pipe is made of a short round steel pipe.

[0010] The diaphragm is not only a processed steel plate but also a ring-shaped cast steel having an outer peripheral projection for joining a flange of an H-shaped steel beam or the like.

In the liquid phase diffusion bonding method, the diaphragm and the steel pipe are abutted with each other, and the insert material is sandwiched at the bonding interface without any need for a groove, and the material is heated to such a degree that plastic deformation hardly occurs in a state of surface contact. , Press and join.

[0012]

[Function] The principle of the liquid phase diffusion bonding method is that the objects to be bonded are abutted, an insert material made of amorphous metal with a low melting point is sandwiched at the bonding interface, and heated and pressed to such a degree that plastic deformation hardly occurs. The object to be bonded is bonded at a temperature equal to or lower than the melting point by utilizing the diffusion of the generated atoms.

This liquid phase diffusion bonding method has the following features.

[0014] Irrespective of the size of the article to be joined, the joining time is constant, and short-time joining is possible.

[0015] A smooth joint with almost no deformation can be obtained.

Accordingly, the processing of the groove, the mounting of the backing metal, and the maintenance of the route interval in the conventional joining method can be omitted. Further, since there is almost no welding margin, there is no hindrance to beam joining, and almost no welding shrinkage occurs.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings, in comparison with a conventional joining method.

FIGS. 1 (a) and 1 (b) show a joint steel pipe 1 made of a short rectangular steel pipe with diaphragms 2 joined to both ends by a joining method of the present invention. )
FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 2 shows a conventional joining method corresponding to the part A, in which a groove 11 is formed on the side of the steel pipe 1 on the side of the joint, and a backing metal 12 is provided inside the steel pipe 1 of the joint. , And the backing metal 12 is used to hold the root interval r, hold the molten metal, and perform welding. In the figure, reference numeral 13 denotes a weld margin.

On the other hand, as shown in FIGS. 1 (a) to 1 (c), when the liquid phase diffusion bonding method is used, the cut connection steel pipe 1 is simply sandwiched between the diaphragms 2 at both ends. With such a structure, there is an advantage that the groove forming process of the end of the steel pipe 1 at the connection portion is not required and the backing metal is not required.

FIG. 1 (c) shows the details of the portion A, which is the joint portion. The joint surface at the end of the steel pipe 1 is flat.
The insert material 3 made of a thin-film amorphous metal is sandwiched between the joint surface of the diaphragm 2 and heated and pressed.

The heating temperature is lower than the melting point of the structural steel forming the connection part steel pipe 1 and the diaphragm 2, higher than the melting point of the insert material 3, and the pressure is about 1-2 kg / mm ² . The joining time is set to be about 1 to 30 minutes regardless of the outer diameter, wall thickness, and the like of the connection portion steel pipe 1. This is necessary in order to diffuse the melting point lowering element of the insert material, Toko that time depends on the heating temperature
The filtrate is large. That is, the higher the temperature, the faster the diffusion speed and the shorter the bonding time. The thickness of the insert 3 made of an amorphous metal is about 20 μm.

In the joining method of the present invention, since the amount of the molten metal is extremely small as compared with the conventional joining method, there is almost no welding shrinkage, and the accuracy of the height h in FIG. 1 (b) can be easily controlled. That is, in the conventional method of FIG. 2, since the amount of the molten metal increases in proportion to the thickness of the connection portion steel pipe 1,
Welding time becomes longer and welding shrinkage becomes larger,
By using the liquid phase diffusion bonding method, bonding can be performed in a very short time of about 1/10 or less as compared with the conventional method, regardless of the thickness of the steel pipe 1 at the joint.

FIG. 3 (a) shows a beam-column joint using the steel pipe 1 and the diaphragm 2 of the joint of the column material joined by the joining method of the present invention. 3 (c) is an enlarged view of a portion B and a portion C of FIG. 3 (a), respectively.

FIGS. 4 (a) and 4 (b) show a conventional example corresponding to the portions B and C. In the conventional method, since there is an extra weld 13, the diaphragm 2 and the upper flange of the beam are shown. It is necessary to secure the gap g shown in FIG. 4 (a) when the welding backing metal 4 is attached to the welding backing 1a. In the connection using the liquid phase diffusion bonding method, as shown in FIG. Without having to secure
There is an advantage that the size of the diaphragm 2 can be reduced accordingly.

FIG. 3 (c) shows the shape of the scallops 5 formed on the beam web 1c required for welding the diaphragm 2 and the lower flange 1b of the beam, as shown in FIG. 4 (b). There is an advantage that small scallop processing is sufficient compared to the method of (1).

FIGS. 5 (a) and 5 (b) show a ring-shaped cast steel having outer peripheral projections 7 for beam joining at both ends of a joint steel pipe 1 made of a short round steel pipe by the joining method of the present invention. FIG. 5 (c) is an enlarged view of a portion D in FIG. 5 (b).

FIG. 6 shows a conventional joining method corresponding to the portion D. In this case, the groove 11 is required to be formed on the side of the steel pipe 1 and the backing metal 12 is required. , Steel pipe 1
Is limited to the thickness obtained by subtracting the thickness of the backing metal 12 from the upper and lower flat portion dimensions (radial width) e of the ring-shaped diaphragm 6, but the liquid phase diffusion bonding method was used. In this case, the thickness in the radial direction can be increased up to the dimension e of the upper and lower flat portions of the diaphragm 6 as shown in FIG.

FIGS. 7 (a) and 7 (b) show the relationship between the joining method of the present invention and the posture of the steel pipe 1 at the joint.
The joining can be performed in a state where the steel pipe 1 is vertical as shown in FIG. 7 or a state where the steel pipe 1 is horizontal as shown in FIG. 7 (b). In the figure, 9 is a pressurizing device for pressurizing the joint,
Reference numeral 10 denotes a heating coil for heating the joint.

On the other hand, FIG. 8 shows a conventional joining method, in which it is necessary to rotate the to-be-worked steel pipe 1 or to move the torch 14, so that the quality of the joined portion can be improved. In general, it is in a downward posture from the viewpoint of the joining time (efficiency).

That is, in the present invention, a good joint can be obtained irrespective of the orientation of the steel pipe at the time of joining, and the joining time is irrelevant to the orientation at the time of joining. Since the degree is large and there is no need to rotate the connection part steel pipe 1 or to move the torch 14, the joining device can be simplified.

[0032]

[Effects of the Invention] It is unnecessary to form a groove on the end of a steel pipe, and the cut steel pipe member can be directly joined as a steel pipe at a connection portion.

[0033] Since the joint portion is made to be a metal touch via an insert material, it is not necessary to attach a backing metal and maintain a route interval. Also, since no backing money is required,
Thickness of steel pipe in connection between steel pipe and diaphragm
Or structural constraints on the width of the diaphragm interface
There is an advantage that is reduced.

Since there is almost no welding shrinkage, an improvement in accuracy in manufacturing can be expected.

[0035] Obstacles in the welding margin when attaching a beam member or the like to the connection portion are avoided , and the size of the diaphragm is reduced.
Such as or, it is possible to reduce the scallop
Structural benefits are obtained.

By controlling the heating temperature, the pressing force, and the joining time, a high-quality joint can be obtained, so that a skilled operation is not required.

[0037] Irrespective of the outer diameter and thickness of the steel pipe, joining can be performed in a fixed joining time and a large number of joining portions can be joined at the same time, so that a reduction in manufacturing time can be expected.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the joining method of the present invention.
(a) is a plan view, (b) is a front view, and (c) is an enlarged view of a portion A of (b).

FIG. 2 is a view showing a conventional joining method corresponding to a portion A in FIG. 1 (b).

3A and 3B show a beam-column joint using a joint joined by the joint method of the present invention, wherein FIG. 3A is a front view, FIG.
(c) is an enlarged view of part B and part C of (a), respectively.

FIGS. 4 (a) and (b) are diagrams showing a conventional example corresponding to a portion B and a portion C in FIG. 3 (a), respectively.

5A and 5B show another embodiment of the joining method of the present invention, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG.

FIG. 6 is a view showing a conventional joining method corresponding to a portion D in FIG. 5 (b).

FIGS. 7A and 7B are schematic views showing the relationship between the joining method of the present invention and the posture of the steel pipe at the connection part.

FIG. 8 is a schematic view showing a relationship between a conventional joining method and a posture of a steel pipe at a connection portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel pipe of connection part 2 ... Diaphragm 3 ... Insert material 4 ... Backing metal 5 ... Scallop, 6 ... Diaphragm,
7 ... outer peripheral projection, 8 ... inner peripheral projection, 9 ... pressurizing device, 10 ... heating coil, 11 ... reed groove, 12 ... backing metal, 13 ... extra welding, 14 ... torch

Claims (1)

(57) [Claims] 1. A method of joining a steel pipe or a steel pipe at a connection part to a column and a diaphragm for beam joining, wherein a flat joining surface is formed at an end of the steel pipe, and the joining surface of the steel pipe and the diaphragm are joined. A joining method of a steel pipe and a diaphragm, characterized in that an insert material made of a thin-film amorphous metal is sandwiched between surfaces and joined by a liquid phase diffusion joining method.