JP2006239761A - Backing material for electrogas welding of square cylindrical column and method of electrogas welding square cylindrical column using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backing material used in manufacturing a joint member by electrogas welding using a square cylindrical object as a column material and a welding method using the same. <P>SOLUTION: Rectilinear part coated small piece groups 9 constituted by juxtaposing a plurality of unit small pieces 7 formed to a rectangular shape in section and corner part coated small piece groups 10 constituted by juxtaposing a plurality of unit small pieces 8 formed to a trapezoidal shape in section are alternately arranged apart at prescribed intervals and the back sides of the rectilinear part coated small piece groups 9 and the corner part coated small piece groups 10 are coupled and connected by metallic tapes 11 having flexibility, thereby constituting the backing material in a crawler system. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of welding a tubular body and a diaphragm by electrogas welding at a connection portion between a column and a beam of an iron structure, and more particularly to a welding method when the tubular body is a square tube.

  When connecting columns and beams in steel structures, joint members are used, but when this joint member is formed, or when joint members and column members are joined, cylinders and column members are used. The end face and the diaphragm plate are fixed by welding. Conventionally, what welds the junction part of a cylinder and a diaphragm with an electrogas welding method is proposed, rotating a cylinder strip. (Patent Document 1)

JP-A-11-033716

  However, when the cylindrical body is a cylindrical body, the welded part is located at a certain distance from the center of rotation, so that even if the position of the so-called cooling metal or welding nozzle is fixed, It will slide relative to the welding nozzle, and the position of the molten pool can be held in a stable position. However, if the cylinder is a square cylinder, the center of rotation is between the straight part and the corner part. The distance from will fluctuate. For this reason, since the distance from the center of rotation of the cylindrical portion of the welded portion changes, it is necessary to perform welding while changing the position of the cooling metal and the welding nozzle for those using the square tube in the conventional configuration. In other words, the structure and its control are extremely difficult.

  The present invention pays attention to such a point, and provides a backing material used when a fitting member is manufactured by electrogas welding using a rectangular tube as a column material, and a welding method using the backing material. For the purpose.

In order to achieve the above-mentioned object, the invention according to claim 1 is arranged such that a plurality of unit small pieces each having a cross section formed in a trapezoidal shape and a straight portion covering small piece group formed by juxtaposing a plurality of unit small pieces having a rectangular cross section. The corner-covered small pieces are alternately arranged with a predetermined interval, and the back side of the straight portion-covered small pieces and the corner-covered small pieces are connected and connected with a flexible metal tape. It is characterized by a crawler type backing material.
According to a third aspect of the present invention, the crawler-type backing material is disposed in a state in which a small piece is positioned on the square tube column side so as to cover the melt-opening space formed at the abutting portion between the square tube column and the diaphragm. Then, the crawler type backing material is bent in a direction in which the small piece is separated from the rectangular tube column surface on the welding progress direction side from the insertion position of the welding torch into the groove space, and the crawler type packing material is square tube as the welding progresses. It is characterized by being brought into contact with the column surface.

  In the present invention, a plurality of unit pieces having a rectangular cross section are juxtaposed to form a covering small piece group for a straight portion with a predetermined length, and a plurality of unit pieces having a trapezoidal cross section are juxtaposed to form a predetermined covering small piece group for a corner portion. A crawler type backing material is formed by forming a plurality of sets of covering small piece groups for linear portions and covering small piece groups for corner portions alternately, and backing the back with a flexible metal tape. Therefore, it is possible to satisfactorily follow the shape of the peripheral surface of the rectangular tube column as a workpiece.

  Further, since the backing material of the present invention is formed in a crawler shape in which unit small pieces are lined with a flexible metal tape, the welding direction lower side (unwelded side) than the insertion position of the welding nozzle in electrogas welding It is possible to curve the crawler-like backing material in the part of the part in the direction away from the peripheral surface of the rectangular tube column, and even if the backing material is relatively fixed to the rectangular tube column that is the workpiece, the welding nozzle is inserted in the welded part. Sufficient space can be secured and stable welding can be performed.

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a partially extracted perspective view of a crawler-type backing material, and FIG. 2 is a schematic perspective view showing a forming member forming process.
The joint member (1) is composed of a rectangular tubular body (2) having both ends opened and a rectangular diaphragm plate (3) which is welded and fixed to both end faces of the tubular body (2). The passing dimension of the diaphragm plate (3) is formed larger than the outer dimension of the cylindrical body (2).

  The peripheral edges of both ends of the cylindrical body (2) constituting the joint member (1) are formed on a tapered inclined surface (groove surface). A ring-shaped backing material (4) that abuts against the flat portion of the diaphragm plate (3) is fitted and fixed to both ends of the cylindrical body (2). The backing material (4) projects a smaller size than the tip end surface of the cylindrical body (2), and the outer end surface of the backing material (4) abuts against the flat surface of the diaphragm plate (3). An appropriate gap (5) is formed between the peripheral edge and the flat surface of the diaphragm plate (3).

  As shown in FIG. 4, the welded portion between the cylindrical body (2) and the diaphragm plate (3) is tack-welded between the cylindrical body (2) and the diaphragm plate (3) and the gap (groove space). (5) is closed at one place in the circumferential direction with a receiving plate (not shown) constituted by a flux tab or the like, and this groove space (5) is covered with a crawler type backing material (6), It is a welding cavity.

  As shown in FIGS. 1 and 3, this backing material (6) is composed of unit small pieces (8) in which ceramic is formed in a trapezoidal cross section as well as unit small pieces (7) in which ceramic is formed in a rectangular cross section. A plurality of unit pieces (7) having a rectangular cross section are juxtaposed to form a cover piece group (9) for a straight portion to a predetermined length, and a plurality of unit pieces (8) having a trapezoidal cross section are juxtaposed for a corner portion. The covering small piece group (10) is formed in a predetermined length, and a plurality of sets of the covering small piece group (9) for the straight portion and the covering small piece group (10) for the corner portion are alternately arranged, and the back surface is made of aluminum. It is backed by a flexible metal tape (11) such as a tape.

  The straight section unit piece (7) having a rectangular cross section and the corner unit unit piece (8) having a trapezoidal cross section are made of ceramics, and correspond to the groove space (5) as shown in FIG. A portion to be cut is cut out in an arc shape so that a surplus is obtained after welding. Moreover, the unit piece (8) for the corner part of the trapezoidal cross section is formed in an isosceles trapezoid shape, and a plurality of oblique sides of the isosceles trapezoid contact each other to follow the corner part of the rectangular tube (2). A certain curvature is obtained.

  The rectangular cylinder (2) and the diaphragm plate (3) configured in this way are arranged in a horizontal axis around the axis of the rectangular cylinder (2) as a rotation support device such as a positioner or a turning roller (not shown). A crawler-type backing material (6) is used for a straight portion in a state where it is supported so as to be rotatable around and covers a groove space (5) formed at a joint portion between the rectangular tube (2) and the diaphragm plate (3). The covering piece group (9) is positioned in a straight line portion of the groove space (5), and the covering small piece group (10) for the corner portion is positioned in a state corresponding to the corner portion of the groove space (5).

  Then, the location where the receiving plate for closing the gap (groove space) (5) is provided as a welding start point, and an electrogas welding welding nozzle (12) is inserted into the location to perform electrogas welding. However, if the outer periphery of the groove space (5) is entirely covered with the crawler type backing material (6), the welding nozzle (12) for electrogas welding cannot be inserted. The crawler type backing material (6) on the lower side in the rotational direction (unwelded location side) than the entry position (welded location) of the nozzle (12) is bent and retracted in a direction away from the peripheral surface of the rectangular tube (2). As the welding progresses, the crawler backing material (6) is brought into contact with the peripheral surface portion of the rectangular tube (2).

  In addition, when the square tube (2) is rotated and circumferentially welded, the distance from the rotation center axis to the outer circumferential surface is different between the diagonal direction and the wall surface orthogonal direction. It is necessary to control the movement of the welding nozzle (12) for gas welding in the horizontal direction. Further, the rotation of the square tube (2) may be an intermittent rotation operation in which the rotation is stopped when the wall portion of the square tube (2) is welded and the rotation is driven when the corner is welded. Is possible.

  The present invention can be used for welding a rectangular column using electrogas welding.

It is a partial extraction perspective view of a crawler type backing material. It is a schematic perspective view which shows the formation process of a joint member. FIG. 3A is a perspective view of a unit piece for a straight portion, and FIG. 3B is a perspective view of a unit piece for a corner portion. It is principal part sectional drawing of a welding part.

Explanation of symbols

2 ... Square column, 3 ... Diaphragm plate, 5 ... Gap space, 6 ... Backing material, 7 · 8 ... Unit piece, 9 ... Straight piece covered piece group, 10 ... Corner covered piece group, 11 ... Metal tape, 12 ... Welding nozzle.

Claims (4)

A backing material (6) used for welding the square column (2) and the diaphragm plate (3) by electrogas welding,
A straight section covering small piece group (9) configured by juxtaposing a plurality of unit small pieces (7) having a rectangular cross section and a corner covering small piece group configured by arranging a plurality of unit small pieces (8) having a trapezoidal cross section. And (10) are alternately arranged at a predetermined interval, and the back side of the linear part covering small piece group (9) and the corner part covering small piece group (10) is connected by a flexible metal tape (11). A backing material for electrogas welding of a rectangular column, characterized in that the backing material (6) is connected to form a crawler type. 2. The rectangular tube column for electrogas welding according to claim 1, wherein each of the unit pieces (7) and (8) constituting the straight portion covering piece group (9) and the corner portion covering piece group (10) is made of ceramic. Backing material. When welding the joint between the square column (2) and the diaphragm plate (3) by electrogas welding,
The crawler type backing material (6) and the unit small pieces (7) and (8) are square cylinders so as to cover the groove space (5) formed at the abutting portion between the square cylinder column (2) and the diaphragm plate (3). Placed on the column side, the crawler type backing material (6) is squared from the insertion position of the welding nozzle (12) into the groove space (5) on the welding direction side. An electrogas for a rectangular column that is curved in a direction away from the surface of the cylindrical column (2) so that the crawler type packing material (6) is brought into contact with the surface of the rectangular column (2) as welding progresses. Welding method. The method for electrogas welding of a rectangular column according to claim 3, wherein the rectangular column (2) is intermittently rotated.

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