JPH11229508A - Connection member for iron steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality of a connection member constituted by joining a diaphragm to both ends of a tubular column material. SOLUTION: A whole-peripherally connected tubular column material 22 is formed by forming a liquid phase diffusive joining part 28 by raising a temperature of the joining part to a melting point or more of an insert material by interposing the insert material between them by butting both ends by molding a plate material 27 in a tubular shape. In this column material 22, quality is stabilized by making physical properties of the joining parts almost equal to physical properties of a base material while substantially eliminating a joining interface by uniformizing a structure of the joining part 28. Therefore, quality of a connection material can be improved by using this column material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection member used as a connecting portion between a column member and a beam member in a building having a steel structure or the like.

[0002]

2. Description of the Related Art Conventionally, as a connecting member used for a building having a steel structure, as shown in FIG.
There is known a connection member 1 having a structure in which steel flat diaphragms 3 and 4 are welded to both ends thereof. The connection member 1 of this structure includes a lower diaphragm 3 at the upper end of a lower pillar 6.
Are joined by welding, and the lower ends of the upper pillars 7 are joined by welding to the upper surfaces of the upper diaphragms 4, and beam members such as H-section steel are attached to the ends of the upper and lower diaphragms 3, 4. 8 is used in a form of being welded or bolted, and the use of this connection member 1 has streamlined the on-site assembly work of the steel structure.

[0003] Usually, the column member 2 is a square tubular member. As shown in FIG. 9 (a), the column member 2 is formed by forming a single plate member 11 into a tube in a cold or hot state. Both end faces 11a
9a, and abutted end surfaces 11a are welded and joined to form a one-seam type. As shown in FIG. 9 (b), the two plate members 12, 12 are semi-tubular (cold or hot), respectively. (Substantially U-shape).
a, 12a, and the butted end surface 12a
Seam type, which is integrated by welding
As shown in (c), the end surfaces 14a of the pair of plate members 14, 14 abut against the surface 13a near both ends of the pair of plate members 13, 13, and the abutted surface 13a and the end surface 14a.
Was welded and used to form a 4-seam type.

[0004]

However, since the welded joint is heated to a high temperature exceeding the melting point of the base metal, it is greatly affected by heat, and the structure of the welded joint is different from that of the base metal, and the tensile strength is increased. The mechanical properties such as hardness, elongation and the like also differ from the base material. For this reason, regions having different structures and physical properties exist in the circumferential direction of the column material. In recent years, there has been an increasing demand for uniform quality and high quality of steel structures, and uniformity of quality and high quality have also been demanded for connection members. In the connection member, regions having different structures and physical properties exist in the pillar material in the circumferential direction, and this is not preferable in terms of uniform quality and high quality.

In order to make the properties of the welded joint close to the base metal,
It is conceivable to perform heat treatment on the welded joint or on the entire column. However, performing the heat treatment leads to an increase in the number of steps and causes an increase in cost. Moreover, even when heat treatment is performed, the structure and physical properties of the welded joint cannot be made entirely equal to the base metal. In order to make the physical properties of the column material uniform, a seamless pipe may be used as the column material. However, the seamless pipe is expensive, and there is a problem that the connection member becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a structure and a physical property of a joint portion of a tubular column having one or more joint portions in a circumferential direction, which are very equal to those of a base material. It is another object of the present invention to provide a connection member using a tubular pillar that can be manufactured at a relatively low cost.

[0007]

SUMMARY OF THE INVENTION The present invention uses liquid phase diffusion bonding instead of welding in order to solve the problems caused by welding when manufacturing a tubular column by joining plates. It is. That is, the connection member of the present invention is characterized in that the column material used for the connection member is formed in a tubular shape with a liquid phase diffusion bonding portion.

Here, in the liquid phase diffusion bonding portion, an insert material having a lower melting point than the base material is interposed between the surfaces of the base material to be bonded, and the insert material has a temperature equal to or higher than the melting point of the insert material under pressure. By heating to a temperature lower than the melting point, boron and the like in the insert material are diffused and assimilated into the base material to be bonded and bonded. Therefore, in the liquid phase diffusion bonding part, metallurgical bonding can be performed at a lower temperature than welding without melting the base material to be bonded, so that the thermal effect on the bonding part and the vicinity thereof is small, changes in material properties, There is little thermal deformation, etc., and thus it has physical properties very close to those of the base material. Moreover, in the liquid phase diffusion joint,
The joining is performed on the surface, and the structure at the joining portion is uniform, the interface of the joining is substantially eliminated, and a joining portion having high strength can be formed. In addition, the quality is determined by the temperature of the joining portion during liquid phase diffusion joining. And the pressure can be controlled, so that a joint of constant quality can be easily obtained without a skilled person, and the reliability is improved. In addition, since surface joining can be performed at a stretch, production efficiency is good and suitable for line production at factories. As described above, although the connection member of the present invention has a configuration in which the tubular column member has the joint, the joint strength of the joint is large and the physical properties thereof are very close to those of the base material. And it can be manufactured to a constant quality without relying on skilled workers,
This has the effect that uniform quality and high quality of the connection member can be expected, as well as cost reduction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The joint member for steel structure of the present invention
It has a short tubular column material and a pair of diaphragms joined to both ends of the column material, and the column material is formed in a tubular shape with a liquid phase diffusion joint.
The steel mentioned here is ordinary steel, high-strength steel, cast steel,
It refers to all iron-based metals that can be used as strength members such as stainless steel. Thus, it is desirable that the joint member of the present invention be made of the same material as the column member or the beam member.

[0010] The tubular pillar used in the connection member of the present invention usually has a square cross section or a round cross section. As a specific structure of the tubular column material, a one-sheet type one in which one plate material is formed into a tubular shape and the both end surfaces are butted together, and the butted end surfaces are integrally joined by a liquid phase diffusion joint,
Each of the two plate members is formed into a semi-tubular shape, the two end surfaces of the two plate members are abutted, and the abutted end surfaces are integrally joined together with a liquid phase diffusion joint, and four plate members are assembled into a square tubular shape. Examples thereof include a 4-seam type in which respective bonding surfaces are integrally bonded with a liquid phase diffusion bonding portion.

In the production of a column material, the liquid phase diffusion bonding at the joint portion of the plate material (base material) constituting the column material is performed in such a manner that surfaces to be joined to each other are brought into close contact with an insert material interposed therebetween, and the insert material and its This is performed by heating the base material portion in contact with the insert material to a temperature equal to or higher than the melting point of the insert material. By the above operation, boron and the like in the insert material are diffused and assimilated into the base materials on both sides, and a bonding state across both base materials occurs,
Both base materials are integrated. When vibration is applied to the butted portion during the heating, an oxide film on the surface of the melted insert material or the like is easily broken, and the quality of bonding is improved.
The joining can also be performed by forming a molten film of the insert material on both base material surfaces and sliding the two molten films together. This method also provides high quality bonding due to the action of squeezing out the oxide film on the surface during sliding.

The insert material used here is arbitrary as long as it can be used for liquid phase diffusion bonding. When the base material to be bonded is steel, it is usually an iron-based material containing boron, silicon, or the like. An amorphous metal foil such as nickel is used. Powder of amorphous metal or the like can be applied by a thermal spraying method, a slurry coating method, or the like to form a layer of the insert material on the base material surface. The contact pressure applied to the bonding surface during the liquid phase diffusion bonding is preferably as low as possible so that both can be kept in close contact with each other.
a, preferably about 5 to 10 MPa. In addition, during liquid phase diffusion bonding at such a low contact pressure, it is also possible to increase the contact pressure for a short time to press the bonding surface. When such a short-time pressurization is performed, a state such as mechanical entanglement occurs on the bonding surface and the bonding strength can be increased, and even if an oxide film is generated on the bonding surface, the bonding surface As a result, the oxide film is broken, the metals come into contact with each other, and true metal-to-metal bonding is obtained, and this also increases the bonding strength. However, if the pressurization is too large or the pressurization time is prolonged, undesired deformation may occur at the end of the column, and the strength may be reduced. In consideration of these, the contact pressure at the time of performing the short-time pressurization is selected to be about 20 to 100 MPa, preferably about 40 to 60 MPa, and the pressurization time is selected to be about 2 to 10 seconds. Is done.

The column material used in the present invention may have the same cross section in the longitudinal direction, or may have a shape in which the cross section changes in the longitudinal direction like a tapered column, and is appropriately determined according to the place of use. . Naturally, the length of the short column material is also appropriately determined according to the place of use. For example, when used in a place where H-shaped steel is attached as a beam material to the diaphragm attached to both ends, the end of the diaphragm at both ends is used. The length of the column material is set so that the flanges on both sides of the H-shaped steel beam can be connected to each other.

The thickness of the short column material is usually constant in the longitudinal direction or changes at a constant gradient like a certain tapered column. Although the invention-made joint member may be formed, it is also possible to form a joint member in which both ends of the pillar material are thickened. According to the latter configuration, the bonding area between the column member and the diaphragm increases, the bonding force increases, and the reliability of the bonding portion is further improved.

[0015] The pair of diaphragms is made of a plate material such as a steel plate, and the shape thereof is set to a shape suitable for connection of a beam material or the like, and is usually a square or a rectangle. Further, the size of the diaphragm is usually selected to be larger than the end face of the pillar, and the end face of the short pillar is pressed against the flat face of the diaphragm and joined. Welding may be used for joining the diaphragm and the end surface of the column material, but it is preferable to use liquid phase diffusion joining also for this portion. That is, it is preferable that the column material and a pair of diaphragms disposed at both ends of the column material be integrated with a liquid-phase diffusion bonding portion, and this configuration avoids the thermal effect of welding. In addition, a joint having high strength and high reliability can be obtained.

Further, in the case where the column material and the diaphragm are integrated with a liquid phase diffusion bonding portion, if necessary, the periphery of the liquid phase diffusion bonding portion can be reinforced by applying fillet welding. Fillet welding eliminates troublesome pre-processing such as beveling, or pre-processing of providing a simple bevel in the local area can be easily performed.
Reinforces the end of the joint surface where the greatest force acts,
High reinforcement effect. Furthermore, when welding is performed, the heat is propagated to the liquid-phase diffusion bonding portion to raise the temperature, so that the liquid-phase diffusion is further ensured, and the quality of the liquid-phase diffusion bonding portion can be improved. Thus, when the surface joining by liquid phase diffusion welding and fillet welding are used together, the liquid phase diffusion joining portion exerts the stress dispersion effect by surface joining, and the edge of the joining surface where the largest force acts on the fillet welding is used. This will reinforce and form a very strong and reliable joint.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention shown in the drawings will be described below. FIG. 1A is a schematic perspective view of a connection member 21 according to a first embodiment of the present invention, FIG.
(C) is a schematic end view of the column member used for the connection member 21. This connection member 21 is a rectangular tubular short column member 22.
And a pair of steel plate diaphragms 23 and 24 attached to both ends thereof. As can be clearly understood from FIG. 1C, the column member 22 is formed by forming a single plate member 27 into a tubular shape, butting both end surfaces thereof, and joining the butted end surfaces together with a liquid phase diffusion bonding part 28. It is a tubular body. In addition, the column member 22 is not limited to the one-seam type tubular body shown in FIG. 1C, and as shown in FIG. In this case, a two-seam type tubular body 22A in which both end faces are butted together and the butted end faces are integrally joined with liquid phase diffusion joints 31, 31 or FIG.
As shown in (c), a total of four plate members, that is, a pair of plate members 33, 33 and a pair of plate members 34, 34, are assembled into a rectangular tube, and the respective joining surfaces (the surface near the end surface of the plate member 33 and the plate member 34) are assembled.
May be used as a four-seam type tubular body 22 </ b> B integrally joined with a liquid-phase diffusion joint 35.

In FIG. 1, a pair of diaphragms 23,
Reference numeral 24 denotes a flat plate having a size capable of pressing the end face of the column member 22, and the diaphragm 23,
The two ends of the column member 22 are pressed against the flat surface of the column member 24, and the column member 22 is integrated with the column member 22 by a liquid phase diffusion bonding portion 25 formed by liquid phase diffusion bonding. This port member 21 is used, for example, in the same manner as the conventional port member 1 shown in FIG. 8, and the dimensions of each part are appropriately determined according to the use conditions.

Next, a method of manufacturing the connection member 21 shown in FIG. 1 will be described. First, the manufacture of the column member 22 will be described. FIG.
As shown in (a), a plate material 27 of an appropriate length is formed into a tubular shape so that both end surfaces 27a, 27a face each other.
This molding may be performed either hot or cold, but is preferably performed hot from the viewpoint of reducing residual strain. The length of the plate member 27 may be a length required for the column member 22 or may be several times as long as the column member 22, and may be cut to the length of the column member 22 later. . Next, plate 2
The both end surfaces 27a, 27a are processed by grinding, polishing, blasting or the like to a flatness required for liquid phase diffusion bonding, a necessary surface finish is performed, and cleaning is performed. This operation may be performed at an appropriate time before or during bending of the plate material 27.

Next, as shown in FIG.
Insert material 37 is interposed between both end surfaces 27a, 27a, and plate 27 formed into a tubular shape is supported by support table 41 and press 4
2, the two end surfaces 27a, 27a are butted via an insert material 37, and the butted end surfaces 27a
a, pressing force required between 27a (for example, 5-20 MPa
Degree) to act. In this state, the insert material 37 and a portion (base material) of the plate material 27 in contact with the insert material 37 are heated by a heating means (not shown) such as an induction coil so as to have a melting point of the insert material 37 or higher. After the temperature is raised to a desired temperature lower than the melting point of the material, the temperature is maintained for a certain time. Thereby, the insert material 37 is melted,
Boron and the like diffuse into the base material in contact with it, and
Are joined by liquid phase diffusion bonding. Thus, as shown in FIG.
A pipe 22C in which both end surfaces are integrated by the liquid phase diffusion bonding portion 28 is manufactured.

Here, the bonding strength of the liquid phase diffusion bonding portion 28 is ensured by optimizing the heating temperature, heating time, contact pressure and the like of the bonding portion during liquid phase diffusion bonding, and these are controlled. This makes it possible to obtain a liquid-phase diffusion bonded part of extremely uniform quality. In addition, since the control of the heating temperature, heating time, contact pressure, etc. of the joint can be easily performed using the control device, no skill is required, and a pipe having a liquid phase diffusion joint of a constant quality can be easily obtained. 22C can be manufactured.

In the above embodiment, the contact force during the liquid phase diffusion bonding is constant, but the pressing force P of the press 42 is increased at a desired timing during the liquid phase diffusion to apply a large contact pressure to the bonding surface. Thus, the joining strength can be further increased.

The liquid-phase diffusion bonding operation described above may be performed in the air. However, in order to ensure that the bonding surface is not oxidized, an antioxidant coating is applied to both sides of the bonding portion to perform the bonding. For example, by performing sealing in a sealed state or by blowing an inert gas to the joint, or by covering the entire plate member 27 with a shield case and filling the inside with the inert gas, the portion where liquid phase diffusion bonding is performed can be inaccurate. It is preferable to hold in an active atmosphere and perform liquid phase diffusion bonding in that state.

Next, the tube 22C formed in the above-described process is used.
Is cut to the length required for the pillar material to form a pillar material 22 having a predetermined length as shown in FIG.
a is processed to the flatness required for liquid phase diffusion bonding, and the necessary surface finish and cleaning are performed. In parallel with this,
The diaphragms 23 and 24 having a predetermined shape and dimensions are manufactured, and necessary surface finishing, cleaning, and the like are performed on the surfaces of the diaphragms 23 and 24 that are joined to the end surfaces 22a of the column members 22.

Next, as shown in FIG.
Of both ends of the diaphragm 2 through the insert material 45.
3 and 24, and the diaphragms 23 and 24 are clamped from the outside by a support 46 and a press 47 so that the diaphragms 23 and 24 are not separated from both end surfaces of the pillar 22 butted through the insert material 45. A suitable contact pressure (for example, about 5 to 20 MPa) is applied. In this state, the insert material 45 and the base material in contact with the insert material 45 are heated by a heating means (not shown) such as an induction coil so as to have a temperature equal to or higher than the melting point of the insert material 45 and lower than the melting point of the base material. After the temperature is raised to the desired temperature, the temperature is maintained for a certain time. As a result, the insert material 45 is melted, and the end face of the pillar material 22 and the diaphragm 2 in contact with the insert material 45 are melted.
Boron and the like are diffused into 3, 24, and the end surface of the column member 22 and the flat surfaces of the diaphragms 23, 24 are liquid-phase diffusion bonded. Thus, as shown in FIG.
The connection member 21 in which the diaphragms 23 and 24 are integrated by the liquid phase diffusion joint 25 is manufactured.

When the liquid-phase diffusion bonding portion 25 is formed, the liquid-phase diffusion bonding portion 25 is formed in the same manner as in the case of manufacturing the pipe 22C.
The bonding strength of the liquid-phase diffusion bonding is ensured by optimizing the heating temperature, heating time, contact pressure, etc. of the joints during liquid-phase diffusion bonding. You can get a part. In addition, since the control of the heating temperature, heating time, contact pressure, etc. of the joint can be easily performed using the controller, no skill is required, and a connection having a liquid phase diffusion joint of a constant quality can be easily achieved. The member 21 can be manufactured. Conventionally, welding by manual work is used for joining the column member and the diaphragm, and thus a skilled person is required. However, such an expert is not required in the present embodiment.

In the case of forming the liquid-phase diffusion bonding section 25 described above, similarly to the case of manufacturing the pipe 22C, the pressing force is temporarily increased during the liquid-phase expansion bonding, or the liquid-phase diffusion bonding is performed. Preferably, the operation is performed in an inert atmosphere.

The above description is for the case of manufacturing the connection member 21 using the one-seam type column member 22, but FIG.
(A) and (b) can be manufactured in the same manner when manufacturing a joint member using the two-seam type column member 22A and the four-seam type column member 22B.

FIG. 5 shows a connection member 21A according to another embodiment of the present invention. This connection member 21A
Similarly to the connection member 21 shown in FIG. 1, a column member 22D made of a one-seam type tubular body integrated into a tubular shape by a liquid phase diffusion bonding portion 28 and both ends thereof are integrally formed by a liquid phase diffusion bonding portion 25. It is composed of a pair of diaphragms 23 and 24, and here, a column member 22D is provided with a thickened portion 22 at both ends.
b. The other configuration is the same as that of the connection member 21, and is manufactured in the same manner as the connection member 21 except for the step of forming the thickened portion 22 b.

The column member 22D provided with the thickened portions 22b at both ends can be manufactured as follows. That is, by the process described with reference to FIG.
Is manufactured by cutting it into a slightly longer length than the column member 22D, and pressing the end face of the tube with a press or the like in a state where both ends are heated. At this time, the heating is concentrated on the end face and the end face side is pressed in a state where a steep temperature gradient is formed at a high temperature, so that the skirt-spread thickened portion 22b as shown in FIG. 6 is obtained. The thickened portion can also be formed by compressing and deforming the heated end of the tube using a mold. Further, a tube 22C having a length several times or more of the length of the column member 22D is manufactured, and a compressive force in a longitudinal direction is applied to the divided position of the tube 22C at a specific interval in a state where the part is glowing red, and a middle height is applied to the divided position. Also, by cutting the center of the thickened portion, the thickened portion 22
b can be formed. Incidentally, the specific interval is set such that the thickened portion formed by the above processing is continuous at an interval at which the short column material can be cut out.

As described above, since the connection member 21A of the embodiment shown in FIG. 5 uses the column member 22D having the thickened portion 22b, the connection area with the diaphragms 23 and 24 is increased. This has the effect of increasing the force and further increasing the reliability of the joint. Further, the thickened portion 22 at the end of the column member 22D is provided.
If b is formed in a flared shape, the deformation due to the pressure at the time of diffusion bonding is concentrated in the pressing direction, so that undesired deformation of the bonded portion can be avoided.

The wall thickness ratio (the wall thickness t at the extreme end) of the thickened portion 22b (see FIG. 6) at the end of the column member 22D in the connection member 21A.
₁ / Thickness of non-increased portion t ₀ ) is about 1.1 to 2.0, and the above-mentioned effect is obtained. The inclination angle θ of the skirt spread is 5 ° to 45 ° in consideration of the above-mentioned effects and the manufacturing circumstances.
The degree is preferred.

In each of the embodiments shown in FIGS. 1 and 5, a pair of diaphragms 23 and 24 are integrated at both ends of tubular column members 22 and 22D having a rectangular cross section only by a liquid phase diffusion joint 25. However, if necessary, the outer periphery of the liquid phase diffusion bonding portion 15 may be reinforced by applying a fillet weld. When this reinforcement is applied, the liquid-phase diffusion joint surface-joins the column material and the diaphragm to exert a stress dispersion effect, and the fillet weld reinforces the end of the joint surface where the largest force acts. This has the advantage that the joining strength between the column and the diaphragm is extremely high. When performing fillet welding, it is not always necessary to perform groove preparation in the area where the column material is to be subjected to fillet welding.However, in order to increase the weld joint strength, a slight groove processing is performed. May be.

Next, the result of actually manufacturing the connection member will be described. [Example 1] (1) Manufacture of pillar material A steel plate having a thickness of 12 mm, a width of 800 mm, and a length of 370 mm was prepared, and both end faces were machine-finished (finishing accuracy:
▽). Next, this steel plate is hot-worked to form a rectangular tube as shown in FIG. 3A, and an insert material 37 is inserted between both end surfaces as shown in FIG. Was. Then, a one-turn induction coil is arranged along the inner and outer surfaces of the joint, and the whole is covered with a shield case.
Nitrogen gas was supplied inside. In this state, a constant pressing force is applied by the press 42 and the induction coil is energized (frequency: about 10 kHz, power: about 80 kW) so that the contact pressure at the joining surface becomes 10 MPa, and the butted portion is heated. When the temperature reached about 1250 ° C., the temperature was maintained at that temperature for about 3 minutes, and then the heating was stopped and the temperature was allowed to cool. Thus, a tube 22C was obtained.

The specifications of the steel sheet and the insert material used here are as follows. Steel sheet: Nominal composition: C 0.16%, Si 0.18%,
Mn 0.83%, P 0.020%, S 0.013
% Insert material: Name; Amorphous metal foil Nominal composition: Cr 5.3%, Si 7.3%, B1.4%,
Remaining Ni Melting point: 1040 ° C Thickness: 38 μm

(2) Manufacture of Connection Member Both end surfaces of the tube body 22C manufactured in the above process were cut flat and machine-finished (finishing accuracy: ▽) to obtain a column member 22. Meanwhile, in parallel with this work, prepare a steel plate diaphragm, grind the surface to be joined to the pillar material,
And finished with sandpaper. The specifications of the diaphragm used here are as follows. Diaphragm: Dimensions: 250 mm x 250 mm x 15 mm Nominal composition: C 0.15%, Si 0.19%, Mn
0.85%, P 0.015%, S 0.012%

The column member 22 and the diaphragms 23 and 24 prepared as described above are assembled as shown in FIG. 4B, and an induction coil (not shown) is arranged on the outer periphery of the upper and lower ends of the column member 22. The whole was covered with a shield case, and nitrogen gas was supplied inside. In this state, the contact pressure at the joint surface is 1
A constant pressing force is applied by the press 47 so that the pressure becomes 0 MPa, and power is supplied to the induction coil (frequency: about 40 kHz).
z, power: about 80 kW), the butted portion was heated and heated, and when the butted portion reached about 1250 ° C., the temperature was maintained for about 3 minutes, and then the heating was stopped and allowed to cool. By the above joining operation, as shown in FIG.
Thus, a connection member 21 having a configuration in which the upper and lower end surfaces of No. 2 were joined to the flat surfaces of the diaphragms 23 and 24 could be manufactured.

(3) Results The appearances of the liquid-phase diffusion bonding portion 28 of the column member 22 and the liquid-phase diffusion bonding portion 25 of the column member 22 and the diaphragms 23 and 24 of the joint member 21 manufactured in the above steps were observed. However, all of the joints had a good appearance.

Next, the surface hardness of the column member 22 in the direction crossing the joint 28 on the outer surface side of the column member 22 was measured.
The result shown in FIG. 7 was obtained. Further, a portion including the joint 28 was cut out from the column member 22, and the tensile strength of the cut test piece was measured. As a result, the vicinity of the joint was broken at 552 N / mm ² . In addition, a similar tensile strength test was performed on test pieces cut from a position 40 mm apart from each other on both sides from the joint 28, and the result was 554 N / m.
m ² , breaking at 542 N / mm ² . This result is also shown in FIG. As is evident from the results, the surface hardness was almost the same in the joint portion 28 and in the other portions. Further, the tensile strength characteristics of the joint 28 were almost comparable to the tensile strength of the base material (the column member 22). Further, when the cross section of the joint portion 28 was cut and observed, no boundary of the joint surface was seen, and a uniform structure was surely diffused in the liquid phase. in this way,
The column member 22 of the connection member obtained in the present example had uniform physical properties in the circumferential direction despite having the joining portion 28 in a part of the circumferential direction.

The joint strength of the joint 25 between the column member 22 and the diaphragm was measured in the same manner. When the tensile strength of the joint was measured, the vicinity of the joint was broken at 547 N / mm ^2. Had.

[0041]

As is apparent from the above description, the connecting member of the present invention has the following effects because the column material used for the connecting member is formed in a tubular shape with a liquid phase diffusion joint. .

Since the liquid-phase diffusion bonding portion is metallurgically bonded without melting the base material to be bonded, there is little thermal influence on the bonding portion and its vicinity, and there is little change in material properties, thermal deformation, and the like. Therefore, the properties are very close to those of the base material.

In the liquid-phase diffusion bonding portion, the bonding is performed on the surface, the texture at the bonding portion is uniform, the interface of the bonding is substantially eliminated, and a bonding portion having high strength can be formed. Since it is possible to control the temperature and pressure of the joint during liquid phase diffusion joining, a joint of constant quality can be easily obtained without a skilled person, and the reliability is improved.

Since the liquid-phase diffusion bonding portion can be surface-bonded at a stretch, the production efficiency is good and suitable for line production in a factory.

As a result, the connection member of the present invention
The joint strength of the tubular column material used is large,
And its physical properties are very close to those of the base material,
In addition, it can be manufactured to a constant quality without relying on a skilled person, so that the quality of the connection member can be made uniform and high quality, and a cost improvement can be expected.

Further, when the column material and the diaphragm are integrated at the liquid phase diffusion bonding portion, the structure becomes uniform at the liquid phase diffusion bonding portion, the bonding interface is substantially eliminated, and the strength is increased. In addition, the properties are very close to those of the base material, and the quality can be controlled by the temperature and pressure of the joints during liquid phase diffusion joining. Stabilization can further improve the quality of the entire connection member.

[Brief description of the drawings]

1A is a schematic perspective view of a connection member 21 according to a first embodiment of the present invention, FIG. 1B is a schematic sectional view thereof, and FIG.
Is a schematic end view of a column member used for the connection member 21.

FIGS. 2 (a) and 2 (b) are schematic end views of modified examples of a pillar used for a connection member.

FIG. 3A is a schematic perspective view showing a state in which a plate material is formed into a tubular shape, FIG. 3B is a schematic side view showing a state in which butted ends of the plate material are liquid-phase diffusion-bonded, and FIG. Schematic end view of

FIG. 4 (a) shows a state before manufacturing the connection member shown in FIG.
FIG. 3B is a schematic cross-sectional view showing a column material and a diaphragm, and FIG. 4B is a schematic cross-sectional view showing a state where the column material and the diaphragm are joined.

5A is a schematic perspective view of a connection member according to another embodiment of the present invention, and FIG. 5B is a schematic cross-sectional view thereof.

6 is a column member 12A used for manufacturing the connection member shown in FIG.
Schematic sectional view showing the lower end shape of

FIG. 7 is a graph showing the results of measuring the physical properties of the column members of the connection member manufactured in Example 1.

FIG. 8 is a schematic perspective view showing an example of a conventional connection member and a use state thereof.

9 (a), (b), and (c) are schematic end views of a column member used for a conventional connection member, respectively.

[Explanation of symbols]

 21, 21A Connection member 22, 22A, 22B, 22D Column material 22C Tube 23, 24 Diaphragm 25 Liquid phase diffusion bonding part 27, 30, 33, 34 Plate material 27a End face 28, 31, 35 Liquid phase diffusion bonding part 37 Insert Materials 41, 46 Supports 42, 47 Press

Claims (5)

[Claims] 1. A steel structural member having a short tubular pillar and a pair of diaphragms joined to both ends of the pillar, wherein the pillar is formed in a tubular shape with a liquid phase diffusion joint. A connection member for a steel structure, comprising: 2. The method according to claim 1, wherein the column member is a one-seam type tubular body formed by forming a single plate member into a tubular shape and abutting both end surfaces thereof, and joining the abutted end surfaces together with a liquid phase diffusion bonding portion. The steel structural member according to claim 1, wherein: 3. A two-seam type tubular body in which the column member is formed by molding two plate members into a semi-tubular shape, butting both end surfaces thereof, and joining the butted end surfaces together by a liquid phase diffusion bonding part. The joint member for a steel structure according to claim 1, wherein: 4. A four-seam type tubular body in which four plate members are assembled into a rectangular tube, and respective joint surfaces are integrally joined with a liquid phase diffusion joint. 2. The connection member for steel structure according to 1. 5. The method according to claim 1, wherein the short column and a pair of diaphragms disposed at both ends of the column are integrated with a liquid-phase diffusion joint. 2. The steel structural member according to claim 1.