JPS62296995A - Production of backing strip for welding h-beam - Google Patents

Abstract

PURPOSE:To enable plastic working of a backing strip for welding by a relatively simple method by forming the outside contour of the backing strip by 1st plastic working and forming the slopes of the deep wall of the grooved hole of such backing strip and the neighborhood thereof by 2nd plastic working. CONSTITUTION:The outside contour of the backing strip 10 is formed by the 1st hot forging (1st plastic working) using dies corresponding thereto. The backing strip 10 is burred by the hot forging and is, therefore, subjected to trimming. While the front and rear surface of the backing strip 10 are held pinched by dies, etc., the backing strip is subjected to the 2nd hot forging from the longitudinal direction of the grooved hole 11, by which the slopes 12 of the deep wall 13 are formed. Such backing strip 10 fits into the crossed part of the web part 5 and flange part 3 of an H-beam 1 cut to a prescribed design groove and is used for welding of the H-beam 1 and the flange of a column, etc. The above- mentioned backing strip is plastically worked by the simple method and contributes to the reduction of man-hours for manufacture.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is for welding H-section steels used for welding between H-section steels or between H-section steels and other structural members. The present invention relates to a method for manufacturing a backing metal.

[Conventional technology]

Conventionally, when performing complete welding between H-section steel or between L-section steel and other structural steel materials, there is a method in which a groove is provided on one side and a backing metal is used for welding.

The method of welding by lifting the back side is used for this purpose. In the latter of the above welding methods, it is necessary to weld twice on the front and back sides, and the so-called back chisel work, in which the back side is cut after welding one side, is extremely complicated and requires a lot of processing man-hours and processing time. . Therefore, it is common to use the former method, in which a notch called a scallop is provided in the web portion of the H-shaped steel that is the welding portion, and a flat bar is passed through this portion to be welded as a backing metal.

FIG. 10 is a side view showing the main parts when welding using the above-mentioned backing metal. In the same figure, 1 is an H-beam steel,
2 is a flange of, for example, a column to which the H-section steel 1 is to be welded.

The H-shaped flange portion 3 is provided with a groove 4, and the web portion 5 is provided with a scallop 6. As described above, a welded portion 8 is formed with gold 7 using the backing material, and the H-section steel 1 and the flange 2 of the column are welded together. However, in this method, processing of the arcuate portion of the scallop 6 is complicated, and in particular, processing of the boundary portion between the flange portion 3 and the web portion 5 requires scraping with a chisel or a grinder to bring the backing metal 7 into contact. It is extremely inefficient because it requires a lot of work, is confined to a narrow space, and must be done manually. Further, when the scallop 6 is formed by gas cutting, notches are likely to occur, and the structure may be destroyed from this portion. In addition, in order to provide a scallop 6,
There are problems such as the occurrence of cross-sectional defects in the web portion 5 that are undesirable in terms of structural strength.

In order to solve the above-mentioned problems, 1. For example, the H-section steel cut into a designed groove shape has a groove that fits into the intersection of the web part and the flange part.

A backing metal for welding an H-section steel is disclosed in which the back wall of the groove is formed into an inclined surface along the plane of the designed groove shape (Japanese Utility Model Publication No. 59-42237). FIG. 1 is a perspective view of the main parts of the backing metal, FIGS. 2 to 4 are a plan view, a front view, and a side view of the center cross section, respectively, and FIGS. 5 and 6 are a perspective view of the backing metal. 10 is a perspective view of a main part and a side view of a main part showing a state of use, and the same parts are indicated by the same reference numerals as in FIG. 10. In these figures, reference numeral 10 denotes a backing metal, which is made of steel or other suitable material and is a web of H-shaped steel 1 cut into a predetermined groove shape 1, for example, at a designed groove angle θ as shown in FIG. A slot hole H is provided at one end surface so as to fit into the portion 5.

Both sides of this slot H are curved portions 12 that match the rounded portions 9 defined by JIS at the intersections of the web portions 5 and flange portions 3 of the H-section steel 1. Also, slot H
The back wall 13 is formed into an inclined surface having the same head angle as the designed groove angle θ.

The backing metal 10 configured as described above is shown in FIG. 5 or 6.
As shown in the figure, when the slot H is fitted into the web portion 5 of the H-beam 1 cut at a predetermined design bevel angle θ, the backing metal 10
The upper surface is installed along the lower surface of the flange portion 3, and has a slotted hole H having an inclined surface having the same inclination angle θ as the groove angle θ.
A back wall 13 is installed along the cut surface of the web portion 5.

As described above, the end face of the backing metal 10 attached to the groove of the H-section steel 1 is arranged to face the flange 2 of the column to which the H-section steel 1 is to be joined, and the two are welded together.

Ru.

[Problem that the invention seeks to solve]

By welding the H-section steel to, for example, the flange of a column using the backing metal as described above, it is possible to solve the problems that conventionally occur due to the provision of scallops. However, manufacturing this backing metal is too complicated to machine from a flat plate of material.

This is unfavorable from an industrial economic point of view because it requires a large number of processing steps.

Furthermore, when casting means is used, the back wall 13 of the slot H becomes a so-called undercut, which requires the use of a core, and the back wall 13 is extremely thin compared to other constituent parts. Therefore, there is a problem in that casting defects such as non-turning, cavities in thick parts, and cracks are likely to occur. On the other hand, when using plastic working means such as forging, there is a problem that the inner wall 13 of the slot H becomes an obstacle, so that it cannot be manufactured using only ordinary forging means.

It is an object of the present invention to solve the problems existing in the above-mentioned conventional techniques and to provide a method for manufacturing the above-mentioned H-section steel welding backing metal by plastic working such as forging.

[Means for solving problems]

In order to solve the above problems, the present invention has a slot that fits into the intersection of the web part and the flange part of the H-beam cut into the designed groove shape, and also has a slot on the back wall of the slot. In the method for manufacturing a backing metal for H-beam steel welding, which is formed into an inclined surface along the surface of the designed groove shape, the outer contour of the outer surface other than the inclined surface of the inner wall of the slot and the vicinity thereof is formed in a first manner. After forming by plastic working and trimming process.

The inclined surface of the inner wall of the slot and its vicinity are formed by second plastic working. This technical method was adopted.

〔Example〕

FIG. 7 is a perspective view showing the material in the embodiment of the present invention, FIG. 8 is a plan view of the same, and FIG. 9 is a side view of the center cross section, which are similar to FIGS. 1, 2, and 4, respectively. Corresponding and identical parts are designated by the same reference numerals. In these figures, unlike the back wall 13 shown in FIGS. 1, 2, and 4, the back wall 13a of the slot H is not provided with an inclined surface, and the material 10 is
It is formed approximately perpendicular to the front or back surface of a. Therefore, a mold corresponding to the external contour of the material 10a is separately produced,
The raw material 10a can be formed by first hot forging from directions A and B in FIG. In this case material 1
In order to prevent underfilling from occurring at 0a, it is common to use raw materials with a volume slightly larger than the material tOa.

Because so-called "burrs" are generated in the material 10a by the hot forging, a trimming process is performed using a mold that corresponds to the external contour of the material 10a. Next, with the front and back surfaces of the material 10a sandwiched between a mold or a press jig, second hot forging is performed from the longitudinal direction of the slot H, that is, from the direction C in FIG. This forms the inclined surface of the back wall 13 shown in FIGS. 2 and 4.

In the above embodiment, an example of hot forging was described as an example of plastic working, but depending on the raw material, cold forging can also be applied, and press forming or other plastic working means can be applied. The processing means may be different. Further, the dimension of the backing metal in the longitudinal direction (direction perpendicular to the slot) can be variously selected depending on the purpose, and the entire backing metal can be formed integrally or flat pars can be connected to both ends. Furthermore, in this example, the case where the groove inclined surface is a flat surface is shown, but there is no problem even if it has a cylindrical convex curved surface other than a flat surface (applicable.
The second plastic working direction is normally 90°, but may be at an angle other than 90″ depending on the condition of the inclined surface of the inner wall of the slot.

[Effects of the Invention] As described above, the present invention provides a backing metal for H-shaped steel welding that has a part that becomes an undercut, and which was conventionally considered to be incapable of plastic working. This method enables plastic working by a simple method, and has the effect of greatly reducing the number of manufacturing steps and manufacturing time of the welding backing metal, as well as reducing variations in quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of a backing metal for welding, which is the object of the present invention, FIGS. are a perspective view of the main part and a side view of the main part showing the usage state of the above-mentioned backing metal, respectively;
FIGS. 7 to 9 are perspective views of essential parts showing materials in embodiments of the present invention, respectively. FIG. 10 is a plan view, a side view in central section, and a side view of a main part showing how a conventional backing metal for welding is used. 1: H-shaped steel, 3: flange part, 5: web part. 7.10: Backing metal, H: Groove, 13, 13a: Back wall.

Claims (4)

[Claims] (1) It has a slot that fits into the intersection of the web part and the flange part of the H-beam cut into the designed groove shape, and the back wall of the slot is sloped along the surface of the designed groove shape. In the method for manufacturing a backing metal for welding H-section steel formed on a surface, the outer contour of the slope of the inner wall of the slot and other than the vicinity thereof is formed by a first plastic working, and a trimming process is performed. A method for manufacturing a backing metal for welding an H-beam steel, characterized in that the inclined surface of the inner wall of the slot and its vicinity are formed by second plastic working. (2) The method for manufacturing a backing metal for H-section steel welding according to claim 1, wherein the plastic working is hot forging or hot press forming. (3) Claim 1 or 2 in which the directions of application of external force in each of the first and second plastic workings form an angle of 90°.
A method for manufacturing a backing metal for welding an H-shaped steel as described in 2. (4) The method for manufacturing a backing metal for welding H-section steel according to any one of claims 1 to 3, wherein the inclined surface of the back wall of the slot is a flat surface or a cylindrical convex curved surface.