JPH06285693A - Tab holding jig - Google Patents

Abstract

PURPOSE:To facilitate the an operation for attaching/detaching a tab by which the molten metal is prevented from flowing from a welded end. CONSTITUTION:The tab holding jig 15 for holding a tab 14 placed on a backing strip 13 is constituted of a C-shaped body 16 which is formed to have a pair of free end parts oppositely facing each other with the backing strip 13 clamped in between, a tab supporting body 17 which is fixedly arranged on one free end part, and a rod 18 which is supported by the rod supporting part 19 of the other free end part in a freely displaceable manner in the direction to approach or recede the tab supporting body 17. In order to repulsively hold the backing strip 13 between the tab supporting body 17 and the rod 18, a compression coil spring 21 is interposed between the nut 20 which is screwed in the thread part 18a of the rod 18 and the rod supporting part 19. Thus, by displacing the rod 18 against a spring force, the tab holding jig 15 is easily attached/detached to the backing strip 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tab holding jig, and more particularly to a case where a root gap is provided between two members and both members are joined by welding using a backing metal. The present invention relates to a tab holding jig for fixing a tab provided so as to hold molten metal at a welding end in order to prevent the generated molten metal from flowing out from the welding end.

[0002]

2. Description of the Related Art Conventionally, when two members are joined together by butt welding or fillet welding, a root gap may be provided between the two members, and a backing metal may be attached to perform welding. At the time of welding, in order to prevent the molten metal from flowing out from the welding end in the welding line direction, a tab is provided at the welding end to prevent the molten metal from flowing out. As the tab, a steel tab, a flux tab, or a ceramic tab is used. In the case of the above steel tabs and flux tabs,
A part of the tab was melted as it was welded together.

On the other hand, in the case of a ceramic tab, since it does not melt, it is used to hold down molten metal and can be removed after welding. By using both sides of the tab, the tab can be reused. You can However, when a ceramic tab is used, temporary welding cannot be performed. Therefore, for example, a general-purpose C-type clamp having a screw rod screwed to one free end is used to clamp the backing plate and fix the tab. Was there.

In the C type clamp as described above,
There is a problem in that it is necessary to rotate or tighten the screw rod when attaching or detaching the tab to tighten or loosen it, which complicates the work of attaching or detaching the tab.

[0005]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the main object of the present invention is to provide a tab used when a root gap is provided between both members and a backing plate is attached for welding. It is to provide a tab holding jig that can easily perform attachment / detachment work.

[0006]

According to the present invention, such an object is provided in the case where a root gap is provided between two members and the two members are joined together by welding using a backing metal. In order to prevent molten metal generated during welding from flowing out from the welding end, a tab holding jig for fixing a tab provided so as to dam the molten metal at the welding end, wherein the tab holding jig is A C-shaped body formed to have a pair of free ends that can face each other with the backing metal sandwiched therebetween, and one free end of the C-shaped body can support the back surface of the tab. A tab support provided on the
A movable body provided at the other free end portion of the C-shaped body so as to be displaceable in the contact / separation direction with respect to the tab support body, and the backing metal by the tab support body and the movable body. It is achieved by providing a tab pressing jig having a movable body and a spring body provided between the movable body and the other free end portion of the C-shaped body for elastically sandwiching. .

[0007]

With this configuration, the movable body is displaced in the direction in which it is separated from the tab support body against the elastic urging force of the spring body, and the backing plate is provided between the tab support body and the movable body. The backing plate can be elastically sandwiched between the tab support and the movable body by releasing the movable body in such a state that the C-shaped body is attached to the backing plate. Is attached, the tab can be supported and fixed by the C-shaped tab support.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of an apparatus for performing automatic welding in manufacturing a column core to which the present invention is applied. This automatic welding apparatus 1 includes a welding robot 4 having an articulated arm 2 and a welding torch 3 supported by the arm 2, and a joint core 5 which is an object to be welded in synchronization with the welding robot 4. It is composed of a positioner 6 for rotating.

A welding electrode rod 7 is attached to the tip of the welding torch 3.
Is provided, and by applying a reciprocating amplitude motion to this, welding with an appropriate bead width can be performed. The positioner 6 has a turntable 8 for supporting the finish core 5 in a cantilever manner, and by rotating the turntable 8 to give an arbitrary angle to the finish core 5. ing.

The joint core 5 comprises a column 9 made of a square steel pipe formed by bending a plate material into a rectangular tubular shape, and a steel plate diaphragm 10 welded to both ends of the column 9 in the axial direction. In the diaphragm 10 of the thus formed joint core 5, for example, a groove 12 is formed at a proper position along a cross section orthogonal to the axis of the H-shaped steel 11 as shown in FIG. The H-shaped steel 11 and the backing plate 13 extending from the end surface of the diaphragm 10 to the back surfaces of the plate portions of the H-shaped steel 11 which are parallel to each other are welded and brought into a joined state, and the multilayered structure is provided between the diaphragm 10 and the groove 12. The H-shaped steel 11 and the diaphragm 10 are integrally connected by performing fillet welding of the heap.

As shown in FIG. 2, the welding torch 3 is arranged so as to have an appropriate inclination angle α when viewed from a direction orthogonal to the axis of the H-shaped steel 11 and to direct its tip toward the groove portion 12. It Further, when viewed from the axial direction of the H-shaped steel 11 (direction of arrow III in FIG. 2), the axis of the welding electrode rod 7 is arranged so as to be orthogonal to the welding line in the direction shown by the arrow A in FIG. 3 ( (See FIG. 3).

In this way, the H-section steel 11 and the diaphragm 10 are automatically welded, but in order to prevent the molten metal generated at the time of welding from flowing out from the weld end in the direction shown by the arrow A of the welding line, A ceramic tab 14 is provided at the weld end to prevent the molten metal from flowing out. Since the tab 14 is made of ceramic, it does not melt during welding, so that the tab 14 can be reused by utilizing both sides of the tab 14. The tab 14 is placed on the backing plate 13 in an upright state, but cannot be adhered and fixed due to the influence of welding temperature, or cannot be welded because it is made of ceramics. Has been done.

As shown in FIG. 3, the tab pressing jig 15 has a C-shaped body 16 formed to have a pair of free ends which can face each other with the backing plate 13 interposed therebetween, and one of them. A substantially L-shaped block-shaped tab support 1 fixed to the free end.
7 and a rod 18 as a movable body which is provided at the other free end portion so as to be displaceable in a direction in which it comes in contact with and separates from the tab support body 17.
Have and. The base end portion of the lower half portion of the rod 18 in the figure is slidably supported by the guide hole 19a of the rod support portion 19 formed at the free end portion of the C-shaped body 16. The threaded portion 18 is on the upper half of the figure.
a is formed, and at the upper end of the rod 18 in the drawing, the expansion head 1 facing the lower surface of the tab support 17 in the drawing is formed.
8b is formed.

A nut 20 is screwed into the threaded portion 18a, and a compression coil spring 21 as a spring body is coaxially interposed between the nut 20 and the rod support portion 19 as a rod. There is. The compression coil spring 21 elastically urges the rod 18 toward the tab support 17 in the direction in which the expanded head portion 18b strikes (the direction of arrow B in the drawing).

A procedure for fixing the tab 14 using the tab holding jig 15 thus constructed will be described below with reference to FIGS. 3 and 4.

First, a part of the tab 14 placed in an upright state on the backing metal 13 is pressed against the side edge of the H-shaped steel 11 serving as a welding end to position the tab 14 with respect to the welding end.
Next, the rod 18 is pulled in the direction opposite to the arrow B against the biasing force of the compression coil spring 21 so that the distance between the tab support 17 and the expansion head 18b becomes larger than the thickness of the backing plate 13. Meanwhile, the backing metal 13 is sandwiched between the tab support 17 and the expanding head 18b, and the end surface of the tab support 17 is brought into contact with the back surface of the tab 14 opposite to the welding side.

By releasing the rod 18, the backing metal 13 can be elastically sandwiched between the lower surface of the tab support 17 and the end surface of the expanding portion 18b in the projecting direction, and the backing metal 13 can be held. The tab holding jig 15 is fixed to.
In this way, the tab 14 is fixed while being sandwiched between the side edge of the H-shaped steel 11 and the end surface of the tab support 17, so that the tab holding jig 15 used for fixing the tab 14 is attached. Can be done easily.

After the welding is completed, the tab pressing jig 15 can be easily removed from the backing plate 13 by pulling the rod 18 in the direction of arrow B in FIG. Further, when the tab 14 is used only once, the tab 14 can be reused for damming another welding portion so that the other surface is used as a new dam.

By properly changing the position of the nut 20 in the axial direction, it is possible to adjust so that an appropriate elastic clamping force is generated even when the thickness of the backing plate is different.

[0021]

As described above, according to the present invention, the C-shaped body is attached to the backing plate by elastically sandwiching the backing plate between both the tab support and the movable body, and Can be supported and fixed by a C-shaped tab support, and the movable body can be displaced only in the direction in which it is separated from the tab support against the elastic biasing force of the spring body. The tab holding jig can be attached / detached, and the workability when fixing the tab can be improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an automatic welding device for a joint core to be measured to which the present invention is applied.

FIG. 2 is a partial sectional view of a welded portion in a joint core.

FIG. 3 is an enlarged view of a main part as seen from the direction of arrow III in FIG.

FIG. 4 is an enlarged plan view of an essential part seen from the line IV in FIG.

[Explanation of symbols]

 1 Automatic Welding Equipment 2 Arm 3 Welding Torch 4 Welding Robot 5 Joint Core 6 Positioner 7 Welding Electrode Rod 8 Rotating Plate 9 Column 10 Diaphragm 11 H-Shaped Steel 12 Groove 13 Backing Plate 14 Tab 15 Tab Holding Tool 16 C-shape Form 17 Tab support 18 Rod 18a Screw part 18b Expanding head 19 Rod support 19a Guide hole 20 Nut 21 Compression coil spring

Claims (1)

[Claims] 1. When a root gap is provided between two members and the two members are joined together by welding using a backing metal, it is intended to prevent molten metal generated during welding from flowing out from the weld end. A tab holding jig for fixing a tab provided so as to dam the molten metal at the welding end, wherein the tab holding jig is a pair of free end portions that can face each other with the backing plate sandwiched therebetween. A C-shaped body formed to have
A tab support member provided to support the back surface of the tab at one free end of the C-shaped member, and the C-shaped member so that the tab support member can be displaced toward and away from the tab support member. The movable body provided at the other free end of the body, the tab support body, and the movable body elastically clamp the backing plate so that the other movable body and the C-shaped body move freely. A tab pressing jig having a spring body provided between the tab and the end.