JPH07110434B2 - Backing metal for welding - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing metal used in the process of welding when manufacturing a column (column material) having a flange joint portion at one end or both ends.

[0002]

2. Description of the Related Art A column with a flange joint portion is manufactured by welding a flat plate material having a size larger than the end contours to both end portions of a strip material formed in a square pipe shape or the like. The welding in this case is to form a gap having a constant width between the frame-shaped end surface of the strip and one plane of the flat plate material (between the base materials), and perform overlay welding in the gap. In order to prevent the weld metal from flowing into the strip through the gap, a frame-shaped backing metal that fits into the opening is inserted in advance at the end of the strip, and a part of this backing metal is used. Adjust them so that they project from the end of the material, then temporarily attach both by welding, and then contact the projecting side frame-shaped end surface of the backing metal with the flat plate material before performing the main welding. Was there .

[0003] Article material to end If you want to temporarily attached to the backing metal, follow
The most common positioning method has been to perform marking in advance on the surface of the backing metal as a guide for the amount of fitting, and to align the backing metal with the edge of the strip based on this marking line. Was there. However, the scribing work and the alignment work are troublesome, and the backing metal may be displaced during welding for temporary attachment. When the backing plate is displaced, the plane direction of the flat plate material does not form a right angle with respect to the longitudinal direction of the strip material, which is obviously unsuitable as a column.

Therefore, for example, Japanese Utility Model Publication No. 1-172493
Press the tool against the surface of the backing metal as shown in the publication.
To form a wedge-shaped recess, and the volume of this recess.
A protrusion is formed as a raised portion of the injury, and the backing metal is positioned with respect to one of the base materials by the protrusion.
Sometimes .

[0005]

[Problems to be Solved by the Invention] But such a back
By means of cutting the surface of the metal with a tool to spread the protrusions
Must be pressed diagonally against the surface of the backing metal.
Therefore, except when manually processing the protrusion by hand,
It is difficult to automatically process the protrusion using a press machine.
is there.

[0006] That is, FIG. 5 shows a conventional process for expanding a protrusion.
It shows an example of performing the method with a press device,
In this case, the back side of the back metal 31 set on the base 30
The backing money 31 is backed up in the fixed block 32.
A molding die having a molding concave portion 33, which serves as a projection mold, at the lower surface thereof.
34 is attached. And in this case, the back deposit 31
Push the punch 35 against the surface of the
A metal that is crushed by the punch 35 when it is brazed
Flow into the molding recess 33 to form a protrusion
However, to move the punch 35 in such an oblique direction
Needs to have a complicated interlocking mechanism in the press machine.
Since the device will be expensive, the surface of the backing metal 31 is ground.
Use the press apparatus in the way of conventional to spread processing the projections I
It is not suitable for automatic processing of the protrusions.

On the other hand, a projection for positioning is provided on the backing plate 31.
If it is peeled, the protrusion will fit in the gap between the base materials.
Therefore, the welded meat at the part with the protrusion is reduced and the fixing strength is increased.
It may reduce the degree . The present invention has been made in view of the above circumstances, in which a positioning projection is formed.
The backing metal is suitable for automatic processing using a press machine.
It can be manufactured at low cost and has a protrusion.
The purpose is to prevent the reduction of the fixing strength between the base materials due to.

[0008]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention, a gap is provided between the base material cross a backing metal subjected to welding and closes from the base material the back surface side, the surface of the backing metal that contacts the rear surface of the base material , One base metal to the other base metal
The surface of one of the base materials has a protrusion for positioning it relative to
In backing metal for welding which projects to the side, the projections,
Width of the front side corner of the one side edge in the width direction of the backing metal
Press with a punch that progresses toward the other side and the corner
By spreading the over portion, said being formed into a thin tongue shape than the gap between the preform other, and spreading processing of the projection
At the same time, there is a recess formed in the corner of the backing metal.
Extend from the widthwise one side edge of the backing metal to the root of the protrusion
It is characterized by being formed .

[0009]

According to the present invention, when the backing metal is brought into contact with the back surface of one of the base materials (for example, the strip material), the projection is brought into contact with the end surface of the base material, so that The position of the backing metal with respect to the material can be fixed. Therefore, the positioning of this base material and the other base material (for example, flat plate material) can also be determined.

The protrusion is a front surface of one side edge surface of the backing plate in the width direction.
A punch that advances from the surface corner toward the other side in the width direction.
It is formed by pressing and spreading the same corner.
Therefore, for example, as shown in FIG.
By operating the punch parallel to the width direction of the money
Protrusions can be formed, and the punch can be
The structure of the press machine is complicated because there is no need to move it diagonally.
do not do.

Further, since the protrusions are formed in a tongue shape thinner than the gaps between the base materials by such spreading, the gaps between the base materials are not cut off by the protrusions, and the protrusions in the gaps are not separated. The welded meat also turns to the position where the mark is provided. Besides,
Due to the light spreading, whether the root of the protrusion corresponds to the protrusion.
A recess extending from one side edge of the backing plate to the width direction is formed.
Therefore, the weld meat will also enter this recess.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a situation in which a square pipe material 10 and a flat plate material 11 are welded together by using a backing metal 1 according to the present invention to manufacture a column (column material). The backing metal 1 of this embodiment is formed by bending a thin strip steel into a frame shape that fits into the end opening of the strip 10. A projection 3 that points toward is projected.

These protrusions 3 are formed on one side edge surface 1A in the width direction of the backing metal 1 by, for example, a pressing device 20 described later .
Corner part located on the surface side (left side of FIGS. 2 and 4)
Of the backing metal 1 that moves toward the other side in the width direction.
It is formed by pressing and spreading with a die 22 . By either mow spreading, each projection 3 is formed in a thin tongue shape to be thinner than the gap between (among base materials each other) with the elongated member 10 and the flat plate member 11, formed of the projections 3 At the corner portion which is the position , one side edge surface in the width direction of the backing metal
A recess 3A extending from 1A to the root of the projection 3 is formed (see FIGS. 1 and 2).

As shown in FIG. 2, these projections 3 have a position dimension h of, for example, 4 to 6 mm from one frame-shaped end surface of the backing plate 1 (the surface on the side contacting the flat plate member 11). And the projecting dimension t from the side surface 2 is
It is formed so as not to exceed the wall thickness dimension of the strip 10. The position dimension h and the protrusion dimension t may be variously changed according to the wall thickness dimension of the strip material 10 and the flat plate material 11 to be used. It is necessary to unify the dimension h for all the protrusions 3.

When such a backing plate 1 is fitted into the end opening of the strip 10, all the projections 3 are brought into contact with the frame-shaped end surface of the strip 10 and further fitting is impossible. In this state, the amount of protrusion of the backing metal 1 protruding from the end face of the strip 10 is constant over the entire circumference. Therefore, by bringing the flat plate member 11 into contact with the frame-shaped end surface of the backing plate 1 on the protruding side, the longitudinal direction of the strip member 10 and the plane direction of the flat plate member 11 can be held in an orthogonal relationship. Since the backing metal 1 never fits too much into the strip 10 as described above, it is possible to perform the main welding from the beginning without welding them for temporary attachment. Is.

On the other hand, since each protrusion 3 is formed in a tongue shape thinner than the gap between the strip member 10 and the flat plate member 11, the gap is not completely blocked by the protrusion 3. The welded meat also goes to the position where the projection 3 is provided in the gap, and the reduction in the fixing strength between the members 10 and 11 is prevented. further,
Each of the protrusions 3 is formed by spreading by a pressing device as described later , and at this time , the recesses 3 formed at the same time as the respective protrusions 3 are formed.
A is the width direction one side edge surface 1A of the backing metal 1 to the root of the projection 3
Since it extends to the original position, as shown in FIG. 2, the welded meat enters the recess 3A at the position where each projection 3 is formed, and the fixing strength at the position where the projection 3 is provided in the gap is improved.

Here, in FIG. 6, the surface of the backing metal 1 is scraped off.
According to the conventional spreading processing method (FIG. 5) for spreading the projections 3,
Shows the usage of the backing metal 1 made by
The same members as those in FIG. 2 such as the plate member 11 are designated by the same reference numerals.
It Then, as in the conventional case, the surface of the backing metal 1 is scraped and projected.
When spreading 3 is processed, the surface of the backing metal 1 is scraped
The wedge-shaped recess 3B that is sometimes formed is the surface center side of the backing plate 1.
The strip 10 and the flat plate located below (the protrusion 3 in FIG. 6)
Since it is not located in the gap between the materials 11, its wedge-shaped recess 3
Welded meat does not enter B. Therefore, in the past
Is the welded meat in the position where the protrusion 3 is formed.
Since it will decrease, the solid between the strip 10 and the flat plate 11
The constant strength may decrease.

In this respect, the backing metal 1 of the present invention has the above
The recess 3A is located in the gap between the strip 10 and the flat plate 11.
Therefore, at the position where each protrusion 3 is formed,
Also has welded meat and fixed strength due to the provision of protrusions 3.
Deterioration is prevented. The backing metal 1 is not limited to the one integrally formed in a frame shape, but a frame shape is formed by combining a plurality of various shapes as shown in FIGS. 3 (a) to 3 (d). It may be allowed to.

In this case, each backing metal 1 has a shape including a frame-shaped corner portion, and at least one protrusion 3 is arranged on each piece sandwiching the corner portion. Preferably. In such a backing metal 1, the protrusion 3 can be formed by using a pressing device 20 as shown in FIG. In this press device 20, an upper die 21 moves up and down on a fixed lower die 23, a punch 22 is attached to the upper die 21, and a lower die 23 is a material for forming a backing metal 1. A chucking mechanism 24 that holds the steel strip 5 immovably is provided.

The chucking mechanism 24 includes a fixed block 25 serving as a backrest of the steel strip 5, and the fixed block 2.
Support blocks 27 that are installed opposite to each other at a predetermined interval in 5
And a slide block 26 which is held so as to be able to slide back and forth automatically or manually from the support block 27 toward the fixed block 25. Slide block 26
Is formed lower than the strip steel 5 in the chucking state, and when the upper die 21 is lowered most, the punch 22
Is adjusted so as to form a gap between the lower end of the slide block 26 and the upper surface of the slide block 26. At this time, the punch 22 is positioned so as to slightly bite into the ridge portion of the strip steel 5 near the slide block 26.

A portion of the upper surface of the slide block 26, which faces the lower surface of the punch 22, also serves as a die for the punch 22. Therefore, when the upper die 21 is lowered, the punch 22 crushes the corresponding portion of the ridge portion of the strip steel 5 and horizontally spreads this crushed portion along the upper surface of the slide block 26. Finally, the protrusions 3 are formed in the gap between the lower end of the punch 22 and the upper surface of the slide block 26.

In the present invention, the protrusion 3 is formed long along the longitudinal direction of the side surface 2 of the backing metal 1 (when the backing metal 1 is frame-shaped as shown in FIG. It may be in the form of a protruding flange). Strip 10
It is optional to use a round pipe shape or a flat plate material 11 as a disk shape. It is also possible to use various shaped steels (H shaped steel, C shaped steel, etc.) as the strip 10.

[0023]

According to the present invention , for positioning the base material
Of the back side of the backing metal in the width direction on one side
Press the punch to move to the other side in the width direction
I made it by spreading the inner part
So, in order to operate the punch parallel to the width direction of the backing metal
Therefore, a protrusion can be formed and the punch can be slanted with respect to the back metal.
There is no need to move it, and for this reason the protrusions using the press device
It is suitable for automatic processing of
You can make it with

Further, due to such spreading, the width direction of the backing metal
A recess is formed that extends from one edge surface to the root of the protrusion .
Since the welded meat will also enter into the concave part,
There is a decrease in the fixing strength between the base materials due to the
It can be effectively prevented.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a situation in which a column with a flange joint portion is manufactured using a backing metal according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a column showing a welding state using a backing metal.

FIG. 3 is a layout diagram showing an example of forming a frame shape by using backing metal plates having various shapes.

FIG. 4 is an explanatory diagram showing a method of forming protrusions.

FIG. 5 is an explanatory diagram showing a conventional method of forming protrusions.

[Figure 6] Enlarged cross-sectional view of the main part showing the state of use of the conventional backing metal
Is.

[Explanation of symbols]

1 Backing metal 1A Edge surface 3 Protrusion 3A Recess 10 Strip material (base material) 11 Flat plate material (base material) 22 Punch

Claims (1)

[Claims] 1. A clearance provided between the base material cross a backing metal subjected to welding and closes from the base material the back side, the is brought into contact with the back <br/> surface of the base material Urato on the surface of the gold and the other one of the base metals
Mother projections of the one for positioning against the base material
In backing metal for welding that protrudes to the surface side of the timber, the protrusions, the surface side Kor widthwise one side edge surface of the backing metal
Press the punch with a punch that advances to the other side in the width direction
By spreading the same corner to the are formed in the base material inter thin tongue shape than the gap of the corner of the spread processing at the same time as the backing metal of the projection
The recess formed in the portion is formed from the one side edge surface in the width direction of the backing metal.
A backing metal for welding, which is formed to extend to the base of the protrusion .