JPS6133717A - Backing plate easy for bend work - Google Patents

Abstract

PURPOSE:To prevent the defect of a welding bead together with the accuracy elevation in bend work by providing a notch in lateral direction on the surface of a strip shaped plane steel plate. CONSTITUTION:Plural V shaped notch 2 or U shaped notch 3 is provided on the surface of the backing plates 1, 1' consisting of a strip shaped plane steel plate. The backing plate 1 having plural V shaped notches 2 is provisionally fitted in a correct projecting dimension with abutting over the whole length of the welding of a tubular column, etc. for welding after its bend work in the necessary curve. The backing plate 1' having a U shaped notch 3 is provisionally fitted to the inner face of the joining part with performing a correct bend work in right angles. The correct bend work of the backing plates 1, 1' is made easy with this method and so a good welding bead without defects can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backing metal that is prepared for tacking on the back side of a weld joint so that a good weld bead is formed.

Conventionally, commonly used backing metals (6) for welded joints are flat steel materials such as FB6X25, FB9X25, and FB.
I2X82, etc., and they are pressed into an L-shape or U-shape and attached to the inner surface of the steel pipe, but the curves of the corners are uneven and uneven, and the pressed backing metal (
6) is also not uniform, so the adhesion is poor in some corners, and the next process of welding cannot be carried out in the best condition, so defects can be found by ultrasonic inspection etc. Even if press processing is performed to match the width, there will be deviations in the width direction, so corrections are made each time.

Taking this process as an example of pillar material for a steel-framed building, after cutting the square steel pipe and preparing a bevel for the joint, welding the backing material (6).
Attach. (See Figures 3 and 4) Backing money (6)
In this method, a strip of flat steel is bent and temporarily welded to the inner surface of the joint of the square steel pipe.In addition to the degree of adhesion to the inner surface of the square steel pipe, the cut surface of the square steel pipe and the backing metal The protruding sides of (6) are parallel and must be installed accurately at right angles to the center of the column, which requires skilled technique and a lot of work time. The reality is that it is installed.

In this invention, horizontal notches are provided on the surface of a flat steel plate in the form of a band, thereby making it possible to bend the steel plate accurately against the inner surface of a joint portion of a steel pipe.

To explain the configuration of this invention with reference to an embodiment shown in the drawings, (1) and (1) are backing plates in which a plurality of V-shaped notches (2) are provided on the surface of a band-shaped flat steel. Either it can be bent into a curve, or it can be bent at right angles by providing a T-shaped U notch (3). (4) is a steel pipe, which is a square steel pipe column being processed, (5) is a bevel, which is a cut part on the cut surface to facilitate welding of the joint, and (6) is a conventional backing metal. , (7) is a steel plate, and in the case of a square steel pipe column, it is a base plate or a blind lid. (8) is a weld bead, which is a welded part of a weld joint.

Since it is constructed as shown in 2 below, bend the backing plate (1) into the required curve with the V notch (2) inward, align it with the inner surface of the steel pipe, and contact the entire length of the joint. Temporarily attach with accurate protrusion dimensions. Welding is performed by applying a steel plate (7) to the edge of a backing plate (1) protruding from the steel pipe to obtain a good weld bead (8). The backing plate (one piece) is bent at a right angle with the U notch (3) inward, and is brought into contact with the inner surface of the joint, and the welding work is performed by temporarily attaching with the correct protrusion dimensions.

As explained above, the backing plate (1), (1)l, which is in close contact with the cut inner surface of the #f4 pipe, can be easily bent (3) with one piece, so multiple V notches (2) can be formed. The backing plate (1) has a flexible curve that can be easily obtained, and at the same time, a consistent dimension in the width direction can be obtained, and the adhesion is good, so there is only one joint part of the backing plate (1). The steel plate (7) can be attached at an accurate angle to the center of the steel pipe, resulting in a defect-free weld bead (8).

In addition, since the remaining plate thickness is bent at the cutout of the flat steel band, the bending process is simple and the bending process using a press machine is not required.

[Brief explanation of the drawing]

1 and 2 are partial perspective views of the backing plates (1) and (I)' of the present invention. FIG. 3 is a perspective view of a conventional backing metal (6). FIG. 4 is a perspective view of a steel pipe with a conventional backing metal (6) temporarily attached. FIG. 5 is a perspective view of the backing plate (1) of the present invention. FIG. 6 is a perspective view of a steel pipe to which a backing plate (1) of the present invention is temporarily attached. FIG. 7 is a cross-sectional view of a steel pipe (4) and a steel plate (7) welded together. FIG. 8 shows an enlarged view of the welding location.

Claims (1)

[Claims] A backing metal for welding joints that facilitates bending by providing a horizontal notch on the surface of a flat steel plate in the form of a belt so that the required bending angle or bending curve can be accurately obtained. Money for the secret.