JPH09225636A - Ceramic backing strip for melt-through bead welding of steelworks connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceramic backing strip which enables a melt-through bead welding method to obtain highly reliable steel frame products by a simple and rational method and which brings a large economic effect. SOLUTION: The ceramic backing strip 1 is the one for melt-through bead welding of a steel frame connection with a square columnar structure, and is used for welding between a column material 3 with a box structure of a structural steelworks or a column material with a steel tube structure and a connection flange 2a or a connection web; the backing strip is provided, on the corner surface and its continuous face of the square columnar structured body, with a tapered face T1 , T2 which comes onto close contact, at the upper end and at an acute angle α, with the rear side on the upward from the root face R of the connection flange 2a or a connection web by the penetration margin of the initial back-bead welding, which faces the root space G between the column material 3 and the connection, and which takes into account the securing of the leg of the initial back-bead; the tapered face T1 , T2 is provided in plurality on the required corner surface and its continuous face of the ceramic backing strip 1; and thus, the one ceramic backing strip 1 is designed to be used for melt-through bead welding in plural number of times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a ceramic backing for constructing a welded portion of a steel-frame joint weld.

[0002]

Conventionally, the Uranami welding method is a method of performing single-sided welding from the inside of a groove using a steel backing, or, after welding the inside of a groove, performing gouging from the back side and performing both sides. It was a method of welding. In the case of the Uranami welding method using a steel backing, there is a danger that cracks may occur due to fatigue from the slits of the non-welded portion of the backing and the column material due to fatigue, or brittle fracture may occur. Further, the double-sided welding method using gouging has problems that it is difficult to find a defect depending on the skill of an operator, the working environment is deteriorated due to dust or the like due to gouging, and the productivity is reduced due to gouging.

[0003]

2. Description of the Related Art As means for solving such a problem, a flux system in which an outer surface facing a joint space between steel members joined by welding is formed into a gentle concave curved surface extending between the two members. And a ceramic backing metal is applied to the two members and welded, and then the backing metal is removed, and the welding is performed on a steel structure having a continuous curved welding portion formed between the two members. Joining methods have been proposed. (See, for example, JP-A-5-8033)

[0004]

According to this welding method, it is possible to fully understand the technical problem of the steel backing described above. However, this welding technique is used for welding between steel members joined by welding. The outer surface facing the joint space is provided with a ceramic backing metal formed in a gentle concave curved surface extending between both members, and welding is performed. However, this means still has the following problems. Is left. That is, (a) as shown in FIG. 12, the ceramic backing surface facing the root interval is formed with a concave curved surface having upper and lower indentations. Generally, the root interval is about 4 mm, and between these 4 mm. It is technically impossible to form a concave curved surface having a depression. Therefore, if the root interval is set to about 10 mm, it is possible to form a gentle concave curved surface on the backing facing this portion, but it is possible to form a concave interval of about 10 mm at the root interval.
It is impossible to carry out backside welding in one pass, and since at least two passes of backside welding are required, welding defects are likely to occur. (B) Further, as is clear from FIG. 12, since the ends of the upper and lower recesses closely contact the steel frame member at an angle close to a right angle,
Since there is a risk of defects in the melting of the members,
After removing the backing, it becomes necessary to gouging this part from the back side. (C) It is extremely uneconomical because the ceramic backing is discarded after one use.

The object of the present invention is to solve the problems of the prior art by a simple and rational method, to carry out a backside welding method for obtaining a highly reliable steel frame product, and to obtain a ceramic having a great economic effect. To provide a backing.

[0006]

[Means for Solving the Problem] The above object is to provide a column member having a box structure of a building steel frame or a column member having a steel pipe structure,
A ceramic backing for welding a steel-framed joint welded portion of a prismatic rod-shaped structure used for welding with a joint flange or a joint web, the corner portion of the ceramic backing main body having the prismatic structure and being connected to this To the surface of the connection flange or the root surface of the connection web, and the upper end is in close contact with the back surface above the penetration margin of the first layer backside welding with an acute angle, facing the root interval between the pillar and the connection and Forming a tapered surface in consideration of securing the leg length of the wave bead, and providing a plurality of tapered surfaces on the required corners of the ceramic backing body and on the surface continuous with this.
This is accomplished by allowing one ceramic backing to be used for multiple backside welds. The above object is achieved by providing a plurality of tapered surfaces of the same kind on the ceramic backing body in claim 1. The above object can be achieved by providing a plurality of different tapered surfaces on the ceramic backing body in claim 1.

[0007]

Embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are perspective views of a steel frame product obtained by using the ceramic backing of the present invention, FIG. 3 is a perspective view showing setting of a box pillar material and a connection flange of a building steel frame, and FIG. 3 is an enlarged view of an essential part of FIG. 3, FIG. 5 is a perspective view showing setting of a steel pipe column material and a connection web, FIG. 6 is an enlarged view of an essential part of FIG. 5, and FIG. 7 is a first part of a ceramic backing body.
8 is a perspective view showing a second embodiment of the ceramic backing body, FIG. 9 is a perspective view showing a third embodiment of the ceramic backing body, and FIG. 10 is a ceramic backing body. FIG. 11 is a perspective view showing a fourth embodiment of the main body, and FIG. 11 is a perspective view showing a fifth embodiment of the ceramic backing main body.

With reference to FIGS. 1, 3 and 4, the details of the ceramic backing used for welding the box pillar material and the connection flange of the building steel frame will be described. Reference numeral 1 is a ceramic backing main body, 2 is a connection, 2a is a connection flange, 2b is a connection web, and 3 is a box pillar material of architectural steel frame. Further, R shown in FIG. 4 is a root surface of the connection flange 2a, G is a root interval, T ₁ , T ₂
Is the tapered surface of the ceramic backing main body, and ΔG is the upper end of the tapered surface T ₁ of the ceramic backing main body 1, which is the connection flange 2.
a is a length between the root surface R and a portion that abuts the upper side of the melted portion of the first layer backside weld above the root surface R at an acute angle α, and D is a direction along the pillar material 3 of the ceramic backing 1. Depth, that is, the length of the back bead leg, θ is the connection flange 2a
Shows the angle of the groove. Further, ΔG corresponding to the back surface of the finish flange 2a sandwiching the acute angle α and the tapered surface T ₁
The upper side and the horizontal extension line of the root surface R constitute a groove 5 having a right-angled triangular cross-section for the purpose of melting the first-layer back-side welding.

[0009]

[Explanation of construction method] At a predetermined position marked on the upper surface of a horizontally installed pillar member 3, a joint 2 composed of an H-shaped joint flange 2a and a joint web 2b is vertically attached. . At this time, the root surface R of the connection flange 2a and the pillar 3
A predetermined route interval G is provided between and. This root gap G is fixed by welding the joint web 2b to the pillar 3. A scallop 4 is provided on the joint web 2b, and the ceramic backing main body 1 is fixed to the back surface of the joint flange 2a and the upper surface of the pillar 3 through the scallop 4. Then, as described above, the ceramic backing body 1 has a predetermined tapered surface T _{1 in} consideration of ensuring the leg length D in the direction along the pillar material 3 of the melted back bead at the root surface R portion of the finish flange 2a. To provide. The length of the leg length D due to the tapered surface T ₁ , the width of the root surface R, the root interval G and ΔG
The length of is a value that can be known from the result of the experiment.
After assembling the joint 2 and the column member 3 under such conditions, welding in the groove is performed. When the welding in the groove is completed, remove the ceramic backing 1. It is inspected whether or not the required leg length D is secured by the plate thickness, and if the leg length D of the back bead is further required, reinforcement welding is performed on the back wave, which is not shown in the figure, and the predetermined length is obtained. Secure leg length D.

[0010]

[Embodiment] Incidentally, the root surface R of the connection flange 2a is about 0 to 4 mm, the root interval G is about 4 mm, and ΔG
Is about 2 mm and leg length D is about 5 mm.

Next, with reference to FIGS. 2, 5, and 6, the details of the ceramic backing used for welding the steel pipe column member and the connection flange will be described. 2 and 5, 1 is a ceramic backing body, 6 is a connection, 6a is a connection flange, 6b is a storage web, and 7 is a steel pipe pillar. Further, T ₁ and T ₂ shown in FIG. 6 are tapered surfaces provided on the ceramic backing main body 1, R is a root surface,
G is the root distance, Ga is the distance between the lower end of the ceramic backing body 1 and the root surface R of the finish web 6b, Gb is the height of the tapered surface T ₁ of the ceramic backing body 1, and ΔG is the ceramic backing body. The upper end of the tapered surface T ₁ of _{No. 1} is the connection web 6
The length between the root surface R and the portion of the b that abuts at the upper side of the melted portion of the first layer backside weld above the root surface R at an acute angle α, D is the leg length of the backside bead, and r is the radius of the steel pipe column material. Is. Since the construction method in this embodiment is the same as that described above, detailed description will be omitted.

FIG. 7 shows a first embodiment of the ceramic backing main body 1, and the back wall of the box pillar member 3 and the joint flange 2a is attached to the lower one corner of the ceramic backing main body 1. A taper surface T ₁ used for welding is provided, and a taper surface T ₂ used for back-side welding of the steel pipe pillar material 7 and the connection web 6b is provided at the upper one corner. .
In the figure, H is the height of the ceramic backing body 1, W is the width of the ceramic backing body 1, and L is the length of the ceramic backing body 1.

FIG. 8 shows a second embodiment of the ceramic backing main body 1, in which both lower corners of the ceramic backing main body 1 face each other.
A tapered surface T _{1 of the} same kind used for back wave welding of the box pillar material 3 and the joint flange 2a is provided, while the steel pipe pillar material 7 and the joint web 6b are provided at one corner of the upper side of the ceramic backing main body 1.
And a taper surface T ₂ used for back-side welding.

FIG. 9 shows a third embodiment of the ceramic backing main body 1, in which diagonal corners of the ceramic backing main body 1 are
The same kind of taper surface T ₁ used when performing the backside welding of the box pillar member 3 and the connection flange 2a is provided.

FIG. 10 shows a fourth embodiment of the ceramic backing body 1, which is of the same type used for back-wave welding of the box column 3 and the joint flange 2a at all corners of the ceramic backing body 1. The taper surface T1 is formed.

FIG. 11 shows a ceramic backing main body 1 according to a fifth embodiment of the present invention, in which both the lower corners and the upper one corner of the ceramic backing main body 1 are provided with a box pillar member 3 and a joint flange 2.
The taper surface T1 of the same kind used for backside welding with a is provided.

[0017]

According to the configuration of the present invention as described above,
The following effects can be obtained. Prevents defects such as insufficient melting and undercuts that occur near the root surface of the joint flange and the joint web, and ensures that the leg length necessary for the back bead and the wetting angle of the extra bead and groove in the groove are appropriate Then
Moreover, since one ceramic backing can be repeatedly used a plurality of times, the economical effect is great, and further, one ceramic backing can be applied to a box column and a steel pipe column.

[Brief description of drawings]

1 is a perspective view of a steel frame product obtained using the ceramic backing of the present invention.

FIG. 2 is a perspective view of a steel frame product obtained using the ceramic backing of the present invention.

FIG. 3 is a perspective view showing setting of a box pillar material and a connection flange of a building steel frame.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a perspective view showing setting of a steel pipe column member and a connection web.

FIG. 6 is an enlarged view of a main part of FIG.

FIG. 7 is a perspective view showing a first embodiment of the ceramic backing main body.

FIG. 8 is a perspective view showing a second embodiment of the ceramic backing main body.

FIG. 9 is a perspective view showing a third embodiment of the ceramic backing main body.

FIG. 10 is a perspective view showing a fourth embodiment of the ceramic backing main body.

FIG. 11 is a perspective view showing a fifth embodiment of the ceramic backing main body.

FIG. 12 is an enlarged view of a main part of a conventional example using a ceramic backing.

[Explanation of symbols]

1 Ceramic backing 2 Joint 2a Joint flange 2b Joint web 3 Building steel pillar material 4 Scallop 5 Right angled triangular groove 6 Reinforcement welding 7 First layer back wave welding R Joint flange, root surface of joint web G Root distance Ga Distance to root surface R Gb Height of tapered surface T1 △ G Penetration length of root surface T ₁ Tapered surface for welding box clearing material and joint flange T _{2 For} welding steel pipe column material and joint web Tapered surface D Leg length H Ceramic backing body height W Ceramic backing body width L Ceramic backing body length

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Kikuchi 118 Futtsuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries, Ltd. Noda Factory (72) Inventor Kazuo Hasegawa 2-2-17 Sotokanda, Chiyoda-ku, Tokyo Sakae Toyo Bussan Within the corporation

Claims (3)

[Claims] 1. A ceramic for a back wall construction of a steel rod joint welded portion having a prismatic rod-like structure used for welding a column member having a box structure of a building steel frame or a column member having a steel pipe structure to a joint flange or a joint web. It is a backing, and on the corner portion of the main body of the ceramic backing having the prismatic structure and the surface connected to this, on the back surface above the penetration margin of the first layer back wave welding from the root surface of the joint flange or the joint web. The upper end is closely contacted with an acute angle to face the root distance between the pillar and the joint, and a tapered surface is formed in consideration of securing the leg length of the first layer Uranami bead, and this tapered surface is formed at the corner of the ceramic backing body. A ceramic backing for the construction of a steel back joint, which is characterized in that a plurality of surfaces are provided on the surface connected to this and one ceramic backing can be used for multiple backside welding. 2. The ceramic backing according to claim 1, wherein the ceramic backing main body is provided with a plurality of tapered surfaces of the same type. 3. The ceramic backing according to claim 1, wherein a plurality of different tapered surfaces are provided on the ceramic backing body.