JPH0910992A - Method for joining h-shape steel beam with steel column and electric conductor used therefor - Google Patents

Abstract

PURPOSE: To expedite welding by using a ceramic back-up material as a backing material, welding with an electric conductor applied on the entire face of a weld zone, and eliminating the tack-welding of a backing as a cause of breaking. CONSTITUTION: A steel column, scallop 12 and an H shape steel beam 2 with a groove face provided are assembled; a ceramic back-up material 8 is put through the scallop 12 and arranged on the lower side of the flange 3a and upper side of the flange 3b of the steel beam 2 so that the front face may come into contact with the steel column 1. The electric conductor 11a of a welding wire is put in the groove 16 thus formed, and welding is performed with a ceramic end tab fixed on both sides. The steel column 1 and steel beam 2 are turned so that the groove 16 on the lower side is up, the electric conductor 11b of the welding wire is put in the groove 16, and welding is performed with the ceramic end tab fixed on both sides. Thus, the component composition of the weld metal can be made uniform.

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 frame column of a building structure and an H-section steel beam, and a conductor used in this joining method.

[0002]

2. Description of the Related Art Conventionally, when welding a steel frame column of a building structure and an H-shaped steel beam, a scallop 12 is attached to a beam web 4 of an H-shaped steel beam 2 as shown in FIGS. 9 and 10. Installation, Figure 10
As shown in, the backing plate 13 is temporarily welded and fixed to the steel column 1 and then main welded so that the welded portions 14 of the beam flange portions 3a and 3b and the welded portion of the beam web portion 4 do not overlap each other. Were joined together. However, the provision of such a scallop 12 means that a large cross-section defect is inherently present, which significantly reduces the proof strength and deformation capacity of the column-beam joint against repeated loads such as earthquakes, which may cause early failure. There is
It was not structurally preferable. 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. This non-scallop method is applied to the beam flanges 3a and 3b of H-section steel and the fillet portion 5
11, a groove surface 7 is formed, and a curved surface having the same radius as the radius (R) of the H-shaped steel transition portions 6a and 6b is formed at the end portion facing the H-shaped steel transition portions 6a and 6b. Two back deposits attached
Angle θ between 13a and 13b and the groove surface 7 provided on the fillet portion 5
This is a joining method in which a metal spacer 15 provided with an inclined surface having the same angle as the above is arranged as shown in FIGS. 10 and 11, and is temporarily welded and fixed, and then main welding is performed.

[0004]

However, in both the conventional joining method in which the scallop 12 is provided and in the joining method in which the scallop 12 is not provided, the backing metal 13, 13a,
13b is temporarily welded between the steel column 1 and the steel beam 2 as shown in FIGS. 14 (a) and 14 (b). Since this temporary weld 17 is a partial weld, it is not welded. Since the stress is concentrated on the part 18 of the and the distortion occurs during cooling of the welded part, the gap between the base metal (steel column and steel beam) of the welded part and the backing metal 13, 13a, 13b becomes larger. There was a problem of breaking from that part. Further, there is a problem that the base material (steel column and steel beam) of the tack welded portion 17 melts to cause an undercut 19.

INDUSTRIAL APPLICABILITY The present invention is a welding method for welding a steel column 1 and a steel beam 2 made of H-section steel without using a backing metal which causes breakage, and a method for this welding. The purpose is to provide a conductor

[0006]

In order to achieve the above object, in a joining method for welding a steel column and an H-shaped steel beam of the present invention, a ceramic backup material is used as a backing material, That is, the conductor is applied to the entire surface of the welded portion for welding. Further, in the joining method for welding the steel frame column and the H-shaped steel beam of the present invention, a welding wire, a welding wire formed or a steel material is used as the conductor.

Further, in the joining method for welding the steel column and the H-shaped steel beam of the present invention, the angle of the groove face provided on the flange of the steel beam on the surface facing the steel column as a ceramic backup material. Or a pair of two ceramic back-up materials, each of which is provided at the end facing the transition from the flange to the web of the steel beam of H-section steel. A curved surface with the same radius as the transition portion is attached, and an inclined surface having the same angle as the angle of the groove surface provided on the flange of the H-shaped steel beam and the fillet portion is provided on the surface facing the steel column. Is. Further, in the electric conductor of the present invention, the component composition is the same as that of the welding wire.

The welded wire used as the metal spacer of the present invention has a triangular cross section as shown in FIG. 5B, and the steel frame column 1 and the ceramic backup material 8, 8a, The groove 16 is formed between the groove 8b and 8b. Further, the steel material used as the conductor 10 has a round cross section, a triangular cross section, etc. as shown in FIGS. 6 (a) and 6 (b), and the material has been conventionally used as a backing metal. Is similar to.

Further, the ceramic backup material 8, 8
One of a and 8b is used for a joining method of providing a scallop, that is, a steel column 1 as shown in FIG. 5 (a).
Is provided with a sloped surface 10 having the same angle as the angle (θ) of the flanges 3a and 3b of the steel beam 2 and the groove surface 7 provided on the fillet portion 5, and the other one is provided with a scallop. Not used for joining methods, ie, the radius (R) of the transitions 6a, 6b at the end facing the transitions 6a, 6b of the steel beam 2 of H-section steel to be joined as shown in Fig. 5b. Curved surfaces 9a and 9b having the same radius as the above are attached, and the flanges 3a and 3b of the H-shaped steel beam 2 and the fillet portion 5 are provided on the surface facing the steel column 1.
The inclined surface 10a having the same angle as the angle (θ) of the groove surface 7 provided on the
, 10b are provided.

In the present invention, "applying the conductors (11a, 11b) to the entire welded portion" means that the conductor (11a, 11b) having a length equal to or longer than the welding length is used.
a, 11b), the conductors (11a, 11b) come into contact with at least one location of the steel column (1) and the steel beam (2) as shown in FIGS. 1, 2 and 3. To be present over the entire length of the weld.

[0011]

In the joining method for welding the steel column 1 and the H-shaped steel beam 2 of the present invention, since the ceramic backup materials 8, 8a, 8b are used as the backing material for welding, the cause of breakage There is no need to tack weld the backing metal. Further, by using the conductors 11a, 11b, it is possible to generate an arc between the conductors 11a, 11b and the welding rod,
Since there is no need to generate between the welding base metal (steel frame column 1 and steel frame beam 2) and the welding rod, there is no adverse effect on the welding base metal. In addition, since the conductors 11a and 11b are melted to form a weld metal, the welding can be speeded up.
By using welding wires as 10a and 10b, it is possible to make the composition of the weld metal uniform.

[0012]

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
A joining method of welding to the steel frame column 1 having a welded assembly box-shaped cross section of 00 mm × 400 mm and a wall thickness of 25 mm will be described.

FIG. 1 is a view for explaining a joining method for providing a scallop according to the present invention, showing a state in which a steel frame beam, a ceramic backup material, and a conductor having a circular or triangular cross section (a steel frame column is omitted). The perspective view shown in FIG. 2 is for explaining the joining method without providing the scallop of the present invention, and is a state in which the steel frame beam, the ceramic backup material, and the conductor having a circular or triangular cross section are combined (the steel column is omitted). ) Shown in FIG. 3, FIG. 3 is an enlarged side view of the upper portion of FIGS. 1 and 2, and FIG. 4 is an enlarged side view of a conductor having a triangular cross section in place of the circular conductor of FIG. FIG. 5 is a perspective view of a ceramic backup material used in the present invention,
6 is a perspective view of a conductor, FIG. 7 is a perspective view showing a combination of a ceramic backup material used in the present invention and a conductor having a circular cross section, and FIG. 8 is a ceramic backup material used in the present invention. FIG. 6 is a perspective view showing a combination of a conductor with a triangular cross section.

Example 1 First, a joining method with a scallop will be described with reference to FIGS. 1, 3, 4, 5, 6A, 7A and 8A. As shown in FIGS. 1 and 3, an H-shaped steel beam 2 having a steel column 1, a scallop 12 and a groove surface 7 is assembled, and a ceramic backup material 8 having a thickness of 15 mm, a width of 25 mm and a length of 231 mm ( 5 a) is passed through the scallop 12 and the lower side of the flange 3 a of the steel beam 2 and the flange
It was arranged on the upper side of 3b so that the front surface was in contact with the steel column 1, and was fixed by a jig (not shown). 4m diameter in the groove 16
Conductor 11 of welding wire with circular cross section of m and length 231
Insert a (a in FIG. 6), fix ceramic end tabs (not shown) on both sides, and perform normal welding. Lower groove groove
Rotate the steel column 1 and the steel beam 2 so that (16) is on top, and the groove groove made in the same manner as above has a base of 7 mm and a height of 9 m.
m, length 231 mm, welding wire conductor 11b (Fig. 6)
B) was put in, ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed. When the ceramic backup material 8 was removed after welding, the conductors 11a and 11b of the welding wire were melted and integrated with the welded portion, and there were no welding defects.

Embodiment 2 Next, a joining method without providing a scallop will be described with reference to FIGS. 2, 3, 4, 5, 6 b, 7 b and 8 b. As shown in FIG. 2 and FIG. 3, the H-shaped steel frame beam 2 provided with the steel frame column 1 and the groove surface 7 is assembled, and the thickness 15
mm, width 25 mm, length 110 mm, two ceramic backup materials 8a, 8b (b in FIG. 5) having a curved surface at one end sandwiching the web 4 of the steel frame beam 2 with the flange of the steel frame beam 2
The front surface was placed on the lower side of 3a and the upper side of the flange 3b so as to contact the steel column 1 and fixed by a jig (not shown). Conductor made of steel with a diameter of 4 mm and a length of 231 mm in the resulting groove 16
11a (a in FIG. 6) was put in, ceramic end tabs (not shown) were fixed on both sides, and ordinary welding was performed. Rotate the steel pillar 1 and the steel beam 2 so that the groove groove 16 on the lower side is on the upper side, and the groove groove 16 made by the same method has a bottom side of 6 mm and a height of 8 mm,
A steel material conductor 11b (b in FIG. 6) having a length of 231 mm was put in, ceramic end tabs (not shown) were fixed to both sides, and ordinary welding was performed. After welding, the ceramic backup materials 8a, 8b were removed, and the steel conductor 11a,
11b was melted and integrated with the weld, and there were no welding defects.

In the above embodiment, the conductors 11a and 11b
The shape of the conductor has a circular or triangular cross section, but the conductors 11a and 11b may have other shapes. Further, the present invention is not limited to the examples in other points than the above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0017]

EFFECTS OF THE INVENTION The present invention having the above-mentioned structure has the following excellent effects. (1) Ceramic back-up material 8, 8 as backing material
Since a and 8b are used, it is not necessary to temporarily attach the backing metal, and the temporary attachment does not cause breakage. (2) Since the conductors 11a and 11b are used, an arc can be generated between the conductors 10a and 10b and the welding rod,
Since it does not need to occur between the welding base material and the welding rod, it does not adversely affect the welding base material. (3) Since the conductors 11a and 11b are melted and become the weld metal, the welding can be speeded up. (4) By using a welding wire or a processed welding wire as the conductors 11a and 11b, the composition of the weld metal can be made uniform.

[Brief description of the drawings]

1 is a perspective view for explaining a joining method for providing a scallop according to the present invention, showing a state in which a steel frame beam, a ceramic backup material, and a conductor having a circular or triangular cross section (a steel frame column is omitted). It is a figure.

FIG. 2 is a perspective view for explaining a joining method without providing a scallop of the present invention, showing a state in which a steel frame beam, a ceramic backup material, and a conductor having a circular or triangular cross section (steel column is omitted). It is a figure.

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

FIG. 4 is an enlarged side view when a conductor having a triangular cross section is used instead of the conductor having a circular cross section in FIG. 3;

FIG. 5 is a perspective view of a ceramic backup material used in the present invention.

FIG. 6 is a perspective view of a conductor used in the present invention.

FIG. 7 is a perspective view showing a combination of a ceramic backup material used in the present invention and a conductor having a circular cross section.

FIG. 8 is a perspective view showing a combination of a ceramic backup material used in the present invention and a conductor having a triangular cross section.

FIG. 9 is a perspective view showing a combination of a steel column and an H-shaped steel for explaining a conventional method of providing a scallop and joining them.

FIG. 10 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. 11 is a perspective view for explaining a joint portion of a steel frame beam in a joining method in which welding is performed without providing a scallop.

FIG. 12 is a perspective view for explaining a usage state of a backing metal and a spacer in a conventional joining method of welding without providing a scallop.

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

14A and 14B 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 2 Steel beam 3a, 3b Beam flange 4 Beam web 5 H-shaped steel fillet 6a, 6b Transition between flange and beam web (corner R
7) Steel beam groove surface 8, 8a, 8b Ceramic backup material 9a, 9b Ceramic backup material curved surface 10, 10a, 10b Inclined surface 11a, 11b Conductor 12 Scallop 13 Back metal 14 Welding portion 16 Open Lead groove 17 Temporary weld 18 Notch-shaped part that is not welded 19 Undercut

Claims (7)

[Claims] 1. In a joining method of welding a steel column (1) and an H-shaped steel beam (2), a ceramic backup material (8, 8a, 8b) is used as a backing material, and a conductor ( 11
A welding method for welding a steel column and an H-shaped steel beam, which comprises applying a and 11b) to the entire welded portion and performing welding. 2. The joining method for welding a steel column and an H-shaped steel beam according to claim 1, wherein the conductors (11a, 11b) are welding wires. 3. The joining method for welding a steel frame column and an H-shaped steel frame beam according to claim 1, wherein the conductors (11a, 11b) are formed by welding wires. 4. The joining method for welding a steel frame column and a steel beam of H-section steel according to claim 1, wherein the electric conductors (11a, 11b) are made of steel. 5. A ceramic backup material (8) comprises:
The flange (3a, of the H-shaped steel beam (2) on the surface of the steel column (1) or the surface of the steel column (1) facing the diaphragm (1a),
The steel frame column and the steel beam of H-section steel according to claim 1, characterized in that an inclined surface (10) having the same angle as the angle (θ) of the groove surface (7) provided in 3b) is provided. Joining method for welding and. 6. A ceramic backup material (8a, 8b)
, A pair of two ceramic backup materials (8a, 8b) at the transitions (6a, 6b) from the flanges (3a, 3b) of the H-section steel beam to the web (4). A curved surface (9a, 9b) having the same radius as that of the transitional portion (6a, 6b) is attached to the opposite ends, and a flange (3a, 3a, The steel frame according to claim 1, characterized in that inclined surfaces (10a, 10b) having the same angle as the angle (θ) of the groove surface (7) provided on the 3b) and the fillet portion (5) are provided. A joining method for welding a column and an H-shaped steel beam. 7. A conductor used in a joining method for welding a steel frame 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.