JPH0910930A - Joining method for welding wide flange steel beam to steel column, and conductor used in the joining method - Google Patents

Abstract

PURPOSE: To eliminate generation of defects associated with the temporary welding of a backing, and to improve the welding efficiency and the properties of the weld metal by providing a ceramics back-up member to which conductors are fixed as the backing of a part to be welded when a steel column or a diaphragm of the steel column is welded to a steel beam of wide flange shape. CONSTITUTION: Conductors 11, 11a, 11b to be used for a backing are made of steel, preferably made of welding wire. The backing is fixed to grooves 10, 10a, 10b at an upper side angle part of ceramics back-up materials 8, 8a, 8b so as to bring the conductors 11, 11a, 11b into contact with at least a steel column. Alternatively, the conductors 11, 11a, 11b are fixed to the grooves 10, 10a, 10b in the upper center part of the ceramics back-up members 8, 8a, 8b so as to be brought into contact with at least a diaphragm of a steel column and a flange of a steel beam of wide flange shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method for welding a steel column of a building structure or a diaphragm of the steel column and a steel beam of H-section steel, and a conductor used in the joining method.

[0002]

2. Description of the Related Art Conventionally, when welding a steel column of a building structure or a diaphragm of a steel column (hereinafter referred to as a steel column etc.) and a steel beam of H-section steel, as shown in FIGS. A scallop 12 is provided on the web 4 of the steel beam 2 of steel, and as shown in FIG. 8, a backing metal 13 is fixed to the steel column 1 or the diaphragm 1a of the steel column 1 by temporary welding and then main welding, and the flange portion 3a , 3b and the welded portion of the web portion 4 were joined so as not to overlap each other. However, the provision of such a scallop 12 means that a large cross-section defect is inherently present, and the proof stress and deformability of the steel column-steel beam beam joint against a repeated load such as an earthquake are significantly reduced, causing an early failure. However, this is not preferable in terms of structure. There is also a drawback that it takes time to form the scallop 12.

Therefore, recently, a non-scallop method without the scallop 12 has been proposed. According to this non-scalloping method, a groove surface 7 is formed on the flanges 3a, 3b and the fillet portion 5 of the H-section steel as shown in FIG. 9, and the H-section steel is formed at the ends facing the transition sections 6a, 6b of the H-section steel. Two backing plates 13a, 13 with curved surfaces of the same radius as the transition parts 6a, 6b of
b and the metal spacer 15 provided with an inclined surface having the same angle as the angle (θ) of the groove surface 7 provided on the fillet portion 5 are shown in FIGS.
This is a joining method of arranging as shown in 11, fixing by temporary welding and then performing main welding.

[0004]

However, in both the conventional joining method in which the scallop 12 is provided and the joining method in which the scallop 12 is not provided, the backing metal 13 is provided between the steel column 1 and the steel beam 2. As shown in Fig. 12, tack welding is performed.Since tack welding 17 is partial welding, stress concentrates on the notch-shaped portion 18 that is not welded, and distortion occurs when the welding portion is cooled. In addition, there was a problem that the gap between the base material (steel frame column or steel beam) of the welded portion and the backing metal 13 was further increased and the portion was broken. Also, the undercut that the base metal of the tack weld 17 melts down
There was also the problem that 19 occurred. The present invention relates to a steel column 1
In a method of welding and joining a steel frame beam 2 of H-section steel and the like, a joining method for welding a backing metal that causes breakage without temporary welding, and a conductor used in this joining method are provided. It is an object.

[0005]

In order to achieve the above object, in the joining method for welding a steel column or the like and an H-shaped steel beam of the present invention, a ceramic backup material to which a conductor is fixed is backed up. It is to use as welding material and weld. Further, in the joining method for welding a steel frame pillar or the like of the present invention and a steel frame beam of H-shaped steel, a conductor formed by welding wire, a steel material or the like is used as the conductor.

Further, in the joining method for welding a steel frame column or the like of the present invention and an H-shaped steel beam, a ceramic backup material having a fixed conductor is used as a ceramic backup material so as to contact at least the steel column. Conductors are fixed to the corners of the upper steel column side, or the center of the upper part of the ceramic backup material is in contact with at least one of the diaphragm of the steel column and the flange of the H-shaped steel beam. The conductor is fixed to the part.

Further, in the joining method for welding a steel column or the like of the present invention and a steel beam of H-section steel, a ceramic backup material to which a conductor is fixed is made up of a pair of two ceramic backup materials. The material has a curved surface having the same radius as the radius (R) of the transition portion at the end facing the transition portion from the flange of the H-section steel beam to the web, and at least the upper steel column side so as to be in contact with the steel column. A conductor is fixed to the corners of the, or it is composed of a pair of two, and each ceramic backup material is at the end facing the transition part from the flange of the H-section steel beam to the web. A curved surface having the same radius as that of the transition portion (R) is attached, and a conductor is provided in the central portion of the upper portion so as to contact at least one of the diaphragm of the steel column and the flange of the steel beam of H-section steel. Is to that there was boss. Further, in the conductor of the present invention, its composition is an alloy having the same composition as the welding wire.

The conductors 11, 11a, 11b of the present invention are welding wires, steel materials, etc., which are columnar or plate-like with a rectangular cross section as shown in FIGS. 3 to 6, and the length thereof is a scallop. In the joining method for providing the joint, that is, what is used in the so-called scallop construction method, it is slightly longer than the welding length, and in the one used in the non-scallop construction method, the total length of the two wires used on the left and right is slightly longer than the welding length. It was done.

The ceramic back-up member 8 to which a conductor is fixed is shown in FIG. 5 (a) when it is used in the joining method of welding the H-shaped steel beam 2 to the steel column 1 by the scallop method. As described above, the groove 10 for fixing the conductor 11 is provided in the corner portion on the upper side of the steel column 1 and the conductor 11 is fixed to the groove 10 with an adhesive or the like. In the joining method for welding the H-shaped steel beam 2 to the diaphragm 1a of Fig. 6, as shown in Fig. 6 (a), the diaphragm 1a of the steel column 1 and the flange 3a of the H-shaped steel beam 2 , 3b is provided with a groove 10 for fixing the conductor 11 in the central portion of the upper portion so as to contact with at least one of them, and the conductor 11 is fixed to the groove 10 with an adhesive or the like.

Further, the other ceramic backup materials 8a and 8b to which the electric conductors are fixed are non-scalloped constructions and are used in the joining method of welding the H-shaped steel beam 2 to the steel column 1 as shown in FIG. As shown in (b) of Figure 2, it is composed of a pair of two, and each ceramic backup material 8a,
8b is a curved surface of the same radius as the radius (R) of the transition portions 6a, 6b at the end facing the transition portions 6a, 6b (see FIG. 11) from the flanges 3a, 3b of the H-shaped steel beam to the web 4. 9a and 9b are attached, and at least the steel pillar 1 on the upper side is in contact with the steel pillar 1
Grooves 10a, 10 for fixing the conductors 11a, 11b to the corners on the side
b is provided and the conductors 11a and 11b are fixed to the grooves 10a and 10b with an adhesive material or the like.

Further, the ceramic backup materials 8a and 8b to which other conductors are fixed are non-scalloped, and are used in the joining method of welding the H-shaped steel beam 2 to the flange 1a of the steel column 1. As shown in FIG. 6 (b), it is composed of a pair of two ceramic backing materials 8a, 8b, and the respective transition parts 6a, 6b from the flanges 3a, 3b of the H-section steel beam to the web 4 are provided. (Refer to FIG. 11) Curved surfaces 9a and 9b having the same radius as the radius (R) of the transition portions 6a and 6b are attached to the ends facing each other, and the diaphragm 1a of the steel column 1 and the flange 3a of the steel beam 2 of H-section steel, A groove that fixes the conductors 11a and 11b in the center of the upper part so that it contacts at least one of the 3b.
10a and 10b are provided, and conductors 11a and 11b are provided in the grooves 10a and 10b.
Is fixed with an adhesive or the like.

[0012]

In the joining method for welding the steel column 1 etc. of the present invention and the H-shaped steel beam 2, welding is performed using the ceramic backup materials 8, 8a, 8b to which the conductors 11, 11a, 11b are fixed. This eliminates the need for temporary welding of the backing metal that causes breakage. Also, by using the conductors 11, 11a, 11b in contact with the welding base metal, an arc can be generated between the conductors 11, 11a, 11b and the welding rod, and the welding base metal (steel frame Since there is no need to generate between the column 1 etc., the steel beam 2) and the welding rod, there is no adverse effect on the welding base material. In addition, the conductors 11, 11a, 11b
As it becomes a weld metal by melting, the welding can be speeded up, and the composition of the weld metal can be made uniform by using the same composition as the welding wire as the conductor 11, 11a, 11b. You can

[0013]

EXAMPLES Examples of the present invention will be described below using rolled H-section steel of 506 mm × 201 mm as the steel beam 2, with a web thickness of 11 mm, a flange thickness of 19 mm, a maximum width b50 mm of the fillet portion 5, and an angle of the inclined surface ( θ) 35
Cross section 4 with a root gap (g) of 7 mm
Steel column 1 with a welded assembly box-shaped cross section of 00 mm x 400 mm and a wall thickness of 25 mm, or fixed to this steel column 1 4
A joining method of welding to a diaphragm having a thickness of 50 mm × 450 mm and a thickness of 19 mm will be described.

FIG. 1 is a view for explaining a joining method in which a scallop of the present invention is provided and an H-shaped steel frame beam is welded to a steel frame column. A ceramic backup material having a steel frame beam and a metal spacer fixed thereto is used. FIG. 2 is a perspective view showing a combined state (a steel frame column is omitted), and FIG. 2 is a view for explaining a joining method for welding an H-shaped steel beam to the steel column without the scallop of the present invention. And a perspective view showing a combination state (a steel frame pillar is omitted) with a ceramic backup material to which a conductor is fixed, FIG. 3 is an enlarged side view of the upper part of FIGS. 1 and 2, and FIG. 4 is a diaphragm of the steel frame pillar. FIG. 5 is an enlarged side view for explaining a joining method for welding a steel beam of H-shaped steel, showing a combined state of a steel column and a ceramic backup material to which the steel beam and the conductor are fixed, and FIG.
FIG. 6 is a perspective view of a ceramic backup material to which a conductor is fixed, which is used in a joining method for welding a steel column and a steel beam of the present invention. FIG. 6 is a joining method for welding a diaphragm and a steel beam of the steel column of the present invention. It is a perspective view of the electric conductor used for.

Example 1 First, a joining method for providing a scallop and welding an H-shaped steel beam to a steel column will be described with reference to FIGS. 1, 3 and 5a. As shown in FIG. 1 and FIG. 3, an H-shaped steel frame beam 2 provided with a steel frame column 1, a scallop 12 and a groove surface 7 was assembled, and as shown in FIG. 5A, a thickness of 6 mm and a width of 8 mm,
A ceramic backup material 8 having a thickness of 15 mm, a width of 25 mm, and a length of 231 mm, to which a conductor obtained by processing a welding wire having a length of 231 mm is fixed, is fixed by a fixing jig (not shown), and further ceramics (not shown) are provided on both sides. The end tabs were fixed and normal welding was performed. The steel column 1 and the steel beam 2 were rotated so that the groove groove 16 on the lower side was on the upper side, ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed on the groove groove 16. After welding ceramic backup material 8
Was removed, the conductor obtained by processing the welding wire was melted and integrated with the weld, and there was no welding defect.

Example 2 Next, a joining method for welding a steel frame beam of H-shaped steel to a steel frame column without providing a scallop will be described with reference to FIGS. 2, 3 and 5 (b). As shown in FIGS. 2 and 3, the steel column 1
Assembling the H-shaped steel frame beam 2 provided with the groove surface 7 and a thickness of 6 mm, a width of 8 mm, and a length of 110 as shown in FIG.
Thickness of 15 mm with fixed conductor processed by mm welding wire
mm, width 25 mm, length 110 mm, two ceramic backup materials 8a, 8b with curved surfaces at one end
The web 4 is sandwiched between the lower side of the flange 3a of the steel beam 2 and the upper side of the flange 3b so that the front surface is in contact with the steel column 1,
After fixing with a fixing jig (not shown), ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed.
The steel frame column 1 and the steel frame beam 2 were rotated so that the groove groove 16 on the lower side was on the upper side, ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed on the groove 16. After the welding, the ceramic backup materials 8a and 8b were removed. As a result, the conductors 11a and 11b processed with the welding wire were melted and integrated with the welded portion, and there were no welding defects.

Embodiment 3 Next, a scallop is provided, and a joining method of welding a steel frame beam of H-section steel to a diaphragm of a steel frame column is shown in FIGS. 4 and 6 (a).
This will be described with reference to FIG. As shown in FIG. 4, the H-shaped steel beam 2 having the diaphragm 1a of the steel column 1, the scallop 12 and the groove surface 7 is assembled, and as shown in FIG. 6 (a), the thickness is 4 mm, the width is 9 mm, and the length is 9 mm. 15 mm thick, 25 mm wide, 231 m long with a conductor made of steel 231 mm thick
The ceramic backup material 8 of m was fixed by a fixing jig (not shown), ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed. The steel column 1 and the steel beam 2 are rotated so that the groove groove 16 on the lower side is on the upper side, and further, ceramic end tabs (not shown) are fixed on both sides, and the groove 16
We did normal welding on. When the ceramic backup material 8 was removed after welding, the conductor made of steel was melted and integrated with the welded portion, and there were no welding defects.

Embodiment 4 Next, a joining method for welding a steel frame beam of H-section steel to a diaphragm of a steel frame column without providing a scallop will be described with reference to FIGS. 4 and 6B. As shown in FIG. 4, the steel column 1
H-shaped steel beam 2 with a diaphragm 1a and groove surface 7
Assemble, as shown in FIG. 6 (b), thickness 4 mm, width 9
mm, 110 mm long welding wire fixed conductor, thickness 15 mm, width 25 mm, length 110 mm, two ceramic backup materials with a curved surface at one end 8
Place a and 8b on the lower side of the flange 3a and the upper side of the flange 3b of the steel beam 2 with the web 4 of the steel beam 2 sandwiched between them so that the front surface is in contact with the steel column 1 and fixed by a fixing jig (not shown). Further, ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed. The steel frame column 1 and the steel frame beam 2 were rotated so that the groove groove 16 on the lower side was on the upper side, ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed on the groove 16. When the ceramic backup materials 8a and 8b were removed after welding, the steel conductors 11a and 11b were melted and integrated with the welded portion, and there were no welding defects.

In the above-mentioned embodiment, the conductor has a columnar shape having a rectangular cross section or a plate-shaped material, but other shapes such as a columnar shape having a circular cross section can be used as well. it can. In addition, the conductor 11a shown in FIG.
, 11b fixed ceramic backup material 8a, 8b
Has curved surfaces (9a, 9b), but the conductor 11a
, 11b, the ceramic backup material on either side may have the same length as the conductors 11a, 11b so that no gap is formed when they are butted.

[0020]

EFFECTS OF THE INVENTION The present invention having the above-mentioned structure has the following excellent effects. (1) As the backing material uses the ceramic backup materials 8, 8a, 8b to which the conductors 11, 11a, 11b are fixed,
Since there is no need to tack-weld the backing metal, the tacking does not cause breakage. In addition, the arc is a conductor 11,
It can occur between the welding rods 11a and 11b and does not need to occur between the welding base metal and the welding rod, so that the welding base metal is not adversely affected. (2) Since the conductors 11, 11a and 11b are melted and become the weld metal, the welding can be performed quickly. (3) By using the conductors 11, 11a and 11b having the same composition as the welding wire, the composition of the weld metal can be made uniform.

[Brief description of the drawings]

FIG. 1 is a view for explaining a joining method in which a scallop of the present invention is provided and an H-shaped steel beam is welded to a steel column, and a state in which the steel beam and a ceramic backup material to which a conductor is fixed are combined. It is a perspective view showing (steel frame pillar omitted).

FIG. 2 is a view for explaining a joining method for welding an H-shaped steel beam to a steel column without a scallop according to the present invention,
It is a perspective view which shows the combination state (steel frame pillar is abbreviate | omitted) with the ceramic backup material which fixed the steel frame beam and the conductor.

FIG. 3 is an enlarged side view of the upper portion of FIGS. 1 and 2.

FIG. 4 is a view for explaining a joining method of welding an H-shaped steel frame beam to a diaphragm of the steel frame column of the present invention, and shows a combination state of the steel frame column and the ceramic backup material to which the steel frame beam and the conductor are fixed. FIG.

FIG. 5 is a perspective view of a ceramic backup material to which a conductor is fixed, which is used in the joining method for welding a steel column and a steel beam of the present invention.

FIG. 6 is a perspective view of a ceramic backup material to which a conductor is fixed, which is used in a joining method for welding a diaphragm of a steel frame pillar and a steel frame beam of the present invention.

FIG. 7 is a perspective view for explaining a conventional method of providing a scallop and joining them, and is a perspective view showing a combination of a steel column or a diaphragm of the steel column and an H-shaped steel.

FIG. 8 is a side view for explaining a usage state of a backing metal in a conventional joining method of providing a scallop and welding.

FIG. 9 is a perspective view for explaining a joint portion of a steel frame beam in a joining method of welding without providing a scallop.

FIG. 10 is a perspective view for explaining a usage state of a backing metal and a metal spacer in a conventional joining method of welding without providing a scallop.

11 is a cross-sectional view taken along the line AA of FIG.

12A and 12B are a front view and a right side view for explaining problems of a conventional joining method using a backing metal.

[Explanation of symbols]

 1 Steel column 1a Diaphragm 2 Steel beam 3a, 3b Flange 4 Web 5 Fillet part of H-section steel 6a, 6b Transition part between flange and web 7 Steel beam groove face 8, 8a, 8b Ceramic backup material 9a, 9b Curved surface of ceramic backup material 10, 10a, 10b Groove 11, 11a, 11b Conductor 12 Scallop 13, 13a1, 13b Backing metal 14 Welded portion 15 Metal spacer 16 Groove 17 Temporary welded portion 18 Notch-shaped portion that is not welded 19 undercut

Claims (8)

[Claims] 1. A conductor (11, 11a, 11b) is fixed in a joining method of welding a steel column (1) or a diaphragm (1a) of the steel column (1) and a steel beam (2) of H-section steel. A welding method for welding a steel column or a diaphragm of a steel column and a steel beam of H-section steel, wherein the ceramic backup material (8, 8a, 8b) is welded as a backing material. 2. The steel column or the diaphragm of the steel column and the H-shaped steel beam of claim 1 are welded, wherein the conductor (11, 11a, 11b) is formed by forming a welding wire. How to join. 3. The joining method for welding a steel column or a diaphragm of a steel column and a steel beam of H-section steel according to claim 1, wherein the electric conductors (11, 11a, 11b) are made of steel. 4. A ceramic backup material (8, 8a, 8b) to which a conductor (11, 11a, 11b) is fixed so that the ceramic backup material (8, 8a, 8b) contacts at least the steel column (1). 2. A steel column and an H-section steel beam according to claim 1, characterized in that a conductor (11, 11a, 11b) is fixed to a corner portion on the steel column (1) side of the upper part of FIG. Joining method for welding. 5. A ceramic backup material (8, 8a, 8b) to which conductors (11, 11a, 11b) are fixed is a diaphragm (1a) of a steel column (1) and a steel beam (2) of H-shaped steel.
Characterized in that the electric conductors (11a, 11b) are fixed to the central portion of the upper part of the ceramic backup material (8, 8a, 8b) so as to contact at least one of the flanges (3a, 3b) of Diaphragm and H of the steel column according to claim 1.
A joining method for welding a steel beam of a shaped steel. 6. A ceramic backup material (8a, 8b) to which conductors (11a, 11b) are fixed is made up of a pair of two ceramic backup materials (8a, 8b).
At the end facing the transition part (6a, 6b) from the flange (3a, 3b) of the H-section steel beam to the web (4), the curved surface of the same radius as that of the transition part (6a, 6b) ( 9a, 9b) are attached, and conductors (11a, 11b) are fixed to the corners of the upper steel column (1) side so as to contact at least the steel column (1). A joining method for welding the steel column according to 1 and a steel beam of H-section steel. 7. A ceramic backup material (8a, 8b) to which conductors (11a, 11b) are fixed is made up of a pair of two ceramic backup materials (8a, 8b).
At the end facing the transition part (6a, 6b) from the flange (3a, 3b) of the H-section steel beam to the web (4), the curved surface of the same radius as that of the transition part (6a, 6b) ( 9a, 9b), and a conductor ((a) 11a, 11b) is fixed, The joining method for welding the steel column or the diaphragm of the steel column and the steel beam of H-section steel according to claim 1. 8. The joining method for welding a steel column or a diaphragm of a steel column and a steel beam of H-section steel according to claim 1, characterized in that the material is an alloy having the same composition as the welding wire. conductor.