JPH03500A - How to fix end tabs for welding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a welding end tab that is used in contact with the end faces of both ends of a groove line when welding butted materials to be welded, and a welding end tab that is used in contact with the end faces of both ends of a groove line, and The present invention relates to a method for fixing an end tab to a welded material.

[Prior art] When butt-welded materials are arc welded, in order to obtain a sound weld over the entire weld line, it is necessary to remove unstable parts at the beginning and end of the weld bead. Regardless of the length of the welded material, as shown in FIG. 4, grooves 10a, called run-off tabs, for filling weld metal are provided at both ends of the groove line 8 formed by the welded materials 7a and 7b.
The waste plates 9a and 9b having IOb are applied, and the entire length including these run-off tabs is welded, and as a final finishing step, such run-off tabs are cut and removed.

However, the preparation, installation, and removal of such run-off tabs requires a considerable amount of time, and when the material to be welded is short, the ratio of man-hours related to run-off tabs to the total welding time becomes large, and improvement measures are necessary. Ta.

As a countermeasure to this problem, instead of run-off tabs, a tile-shaped solid material mainly composed of a refractory metal oxide is applied to the end faces of both ends of the groove line, and the weld start and end are treated with this part to ensure a defect-free weld. A method was devised to finish it as
No. 8-199697 or JP-A-60-:17296
A welding end tab was proposed in the issue.

That is, in JP-A No. 58-199697, a proposal was made regarding the physical characteristics of a welding end tab to make the weld sound, and in JP-A No. 60-37296, a proposal was made regarding the physical characteristics of a welding end tab in order to make the weld sound. A shape of a welding end tab for forming an excess buildup has been proposed.

These welding end tabs are extremely useful in themselves, but no proposal has been made from the perspective of simply and firmly attaching the welding end tab to the material to be welded, and only by simply pressing it with a magnet. In this case, it is not possible to firmly attach the parts, and there are also cases where the magnetic force is weakened by the welding heat and the parts come off, resulting in unsatisfactory welding.

[Problems to be Solved by the Invention] The purpose of the present invention is to make the operation of attaching a welding end tab to a material to be welded extremely simple and to firmly fix it. Even if there is a spillage accident, or if the medium wave welding material is moved or reversed, the fixation of the welding end tab to the material to be welded will not loosen, and sound welding can proceed.

[Means and effects for solving the problem] The gist of the present invention is to provide a recess into which the end of the mounting jig is fitted on the side opposite to the side that dams up molten metal. The welding end tabs are arranged at both ends of the groove, and the clips are spread so as to straddle both ends of the groove, and both ends of the clip are fitted into the recesses of the both end tabs. The method of fixing an end tab for welding is characterized in that both end tabs are pressed and fixed to both ends of a groove by the spring action of the clip.

The present invention will be explained in detail below.

An example of the welding end tab of the present invention is shown in FIG. The main body 1 of the welding end tab is formed by molding and solidifying a composition mainly composed of a refractory metal oxide into a tile shape.

The welding end tab of the present invention has a small hole 2 on the surface opposite to the side that holds back molten metal. This small hole 2 does not penetrate through the welding end tab, but is in the form of a recess with an appropriate depth, and is located approximately in the center of the back surface of the welding end tab.

3 in FIG. 1 is a groove that forms an appropriate excess in the weld metal on the surface that contacts the groove line end surface, but in the present invention, "C" does not specify the presence or absence of this groove or its shape. do not have.

The end tab for welding of the present invention shown in FIG. 1 is shown in FIG. 2(a).

It is attached to the material to be welded in the manner shown in FIG. 3 using a mounting bracket made by bending the steel wire illustrated in FIG. 3(b).

In the mounting bracket shown in Figure 2, (a) is when expanded (when in use)
(b) is an example of a product that is bent into a rectangular shape, and (b) is an example of a product that is bent into an arc shape when expanded (in use). The clip 4 consists of tip parts 5a and 5b, and is made of a continuous piece of bent steel wire. By the way, the W4 wire is inherently elastic, and if it is pressed with a conventional clip 4 that has been simply bent as shown in Fig. The purpose of attaching a welding end tab can be achieved. However, in such a state, the tip of the clip that is being pressed tends to shift and is extremely unstable. Therefore, although the installation itself is simple, it is difficult to prevent molten metal from flowing away during welding or to solve problems such as dislodgement of the welding end tab due to slight impacts 7 during welding.

The welding end tab of the present invention solves this problem, and the fixing method of the present invention is as shown in FIG. That is, the tip 5 of the clip is oriented toward the inside of the welding line, and is inserted into the small hole 2 of the welding end tab la as a pressing end. This condition is also the same on the welding end tab Ib side. In such a state, if the clip 4 is firmly pressed, the positional relationship between the tip 5 of the clip and the welding end tab will not shift even if there is considerable impact.

When an annular bent part is provided in the center of the clip, this acts as a spring, making it possible to strengthen the pressing force on the welding end tab and making it easier to attach and remove the clip. I can do it.

As described above, the welding end tab and the fixing method thereof according to the present invention enable the welding end tab to be easily and firmly attached to the workpiece to be welded, and it is possible to obtain an extremely sound welded part.

By the way, the welding end tab in the present invention has a refractory metal oxide as its main component, but the present invention does not specify this component, and instead uses ordinary silica, alumina, zircon, magnesia, etc. The shape is similar to that of a conventional welding end tab except that it has a small hole.

Although the small holes are shown as circular in FIG. 1, they are not particularly limited to this. The size of the small hole needs to fit the tip of the mounting bracket used, but it is usually 4~
10III [about 11Φ, and the depth is about 1 to 5 mm. Furthermore, the welding end tab of the present invention is within the scope of the present invention as long as it is used in a method other than the mounting bracket according to the present invention method in which the pressing end is inserted into a small hole. The steel wire of the clip is usually 2 to 5
A circular cross section of about mmΦ is used, but other shapes such as a rectangular shape may also be used. Regarding the composition of the steel wire, ordinary carbon steel may be used, but it is necessary to select it by taking into consideration the size of the material to be welded, the amount of welding heat input, whether preheating is required, etc. (
1-9% Gr and 1-3! Heat-resistant steel or stainless steel containing kMo9 is preferable.

[Examples] The present invention has been described in detail above, and examples of the present invention will be described below.

First of all, Sin245wt! In, AR20335wt%
i, Mg020wt! A powder mixture having a composition of was sintered at high temperature to produce both the welding end tab of the present invention shown in FIG. 1 and the conventional type welding end tab shown by lla in FIG. In this case, the size and shape of the end tab are 7 x 35 x 35 mm square,
The groove for excess weld metal has a depth of 1. o fight, width 15m
m, the small hole of the end tab of the present invention has a depth of 2.0 mm,
It is a circular hole with a diameter of 4.0 mm.

Furthermore, a second metal fitting for mounting the welding end tab is also available.
The clip of the shape shown in figures (a) and (b) and the fifth
Three types, indicated by 4 in the figure, were prepared. The materials used for the clips were steel wires with a circular cross section of 3.2 mmΦ, and the compositions were stainless steel in Figure 2 (a), 50 kg steel in Figure 2 (b), and 50 kg steel in Figure 5. 4
stainless steel was used.

Using these welding end tabs and clips, welded 5M-50B with a plate thickness of 25+ nm and a length of 250III (
JIS G310 [i) Steel butt welding was performed using C02 semi-automatic arc welding.

Table 2 shows the combinations of welding end tabs and clips and the welding results. Note that the welding wire used was
Shown in the table.

As shown in Table 2, good results were obtained for the invention examples &1 and 52, but for the comparative examples -NCL3 and &4, the fixation of the welding end tab to the welded material was poor, and the casting Alternatively, a problem occurred in which molten metal was washed away.

[Effects of the Invention] As described above, by using the end tab and the attachment method to the welded material of the present invention, it is possible to extremely easily attach the end tab to the welded material firmly, and the end tab does not move during welding. It is possible to obtain sound weld metal without any problems.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining the welding end tab of the present invention, FIGS. 2(a) and (b) are perspective views for explaining the welding end tab mounting bracket used in the method of the present invention, and FIG. 3 4 is a perspective view for explaining the method of the present invention, FIG. 4 is a perspective view for explaining welding using a conventional run-off tab, and FIG.
The figure is a perspective view for explaining a method of using a welding end tab other than the present invention. ! ...Welding end tab, 2...Small hole, 3...Groove, 4...Mounting bracket (clip), 5a, 5b...
・Mounting bracket tip, 6... Annular bent part, 7a, 7
b...material to be welded, 8...bevel line, 9a, 9b-run-off tab, IOa, lOb...groove, 11a, l
lb... conventional welding end tab.

Claims (1)

[Scope of Claims] 1. An end tab for welding, characterized in that a recess into which an end of a mounting jig is inserted is provided on the side opposite to the side that holds back molten metal. 2. Arranging the welding end tabs according to claim 1 at both ends of the groove, spreading the clips so as to straddle both ends of the groove, and fitting both ends of the clip into the recesses of the both end tabs. A method for fixing an end tab for welding, characterized in that both end tabs are pressed and fixed to both ends of a groove by the spring action of a clip.