JPH0679796B2 - Fixing of welding end tabs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a welding material for an end tab for welding, which is used by abutting the end faces of both ends of a groove line when welding the welding materials to be butted. It is related to the fixing method to.

[Prior Art] When arc welding a butt-welded material, in order to obtain a sound weld over the entire weld line, it is necessary to remove the unstable portion at the beginning and end of the weld bead. As shown in Fig. 4, regardless of the length of the material to be welded,
At the both ends of the groove line 8 formed by 7a, 7b, the scrap plates 9a, 9b having the grooves 10a, 10b for filling with the weld metal called runoff tabs are applied, and the entire length including these runoff tabs is welded to finish. As a general finish, such runoff tabs are cut and removed. However,
Preparation, installation, and removal of such a runoff tab require a considerable amount of time, and when the material to be welded is short, the ratio of man-hours for the runoff tab to the total welding time becomes enormous, and an improvement measure is required.

As a measure against this, instead of a run-off tab, a tile-shaped solid material containing a refractory metal oxide as a main component is applied to the end faces of both ends of the groove line, and the welding start and end are processed in this part to ensure that there is no defect in the welded part. The method of finishing as
-199697 or Japanese Patent Laid-Open No. 60-37296 proposes an end tab for welding.

That is, Japanese Patent Laid-Open No. 58-199697 proposes a physical property of a welding end tab for making a welded part sound, and Japanese Laid-Open Patent Publication No. 60-37296 discloses a suitable welding end. The shape of the welding end tabs for forming the overfill has been proposed.

Although these welding end tabs are extremely useful by themselves, no proposal has been made from the viewpoint of easily and firmly attaching the welding end tab to the material to be welded, and they are simply pressed by a magnet. However, in this case, it is not possible to firmly attach, and there are cases where the magnetic force is weakened by the welding heat and it comes off, so that satisfactory welding cannot be performed.

[Problems to be Solved by the Invention] The present invention has an object to make the operation of attaching a welding end tab to a material to be welded extremely simple and to firmly fix the welding end tab. If there is an outflow accident, the welding end tab can be fixed to the welding material even if the welding material is moved or inverted during welding, and sound welding can be performed.

[Means and Actions for Solving the Problems] The gist of the present invention is that welding end tabs having recesses on the surface opposite to the side for stopping molten metal are arranged at both ends of the groove, and Clip both ends of the wire curved or bent inward toward the end tab surface so as to extend over both ends of the groove, and insert both ends of the clip into the recesses of the end tabs. hand,
A welding end tab fixing method is characterized in that both end tabs are pressed and fixed to both ends of the groove by a spring action of a clip.

The present invention will be described in detail below.

First Example of Welding End Tab Used in the Method of the Present Invention
Shown in the figure. The main body 1 of the welding end tab is a tile-shaped composition formed by solidifying a composition containing a refractory metal oxide as a main component.

The welding end tab used in the method of the present invention has a small hole 2 on the surface opposite to the side where the molten metal is dammed. The small hole 2 does not pass through the welding end tab but has a recessed shape having an appropriate depth, and is located substantially at the center of the back surface of the welding end tab.

Reference numeral 3 in FIG. 1 is a groove for forming an appropriate swell on the molten metal on the surface contacting the groove end surface, but the present invention does not specify the presence or shape of this groove.

In the present invention of FIG. 1, the welding end tab is shown in FIG.
The steel wire illustrated in (b) is attached to the material to be welded in the manner shown in FIG.

In the mounting bracket shown in Fig. 2, (a) is when expanded (when used)
In the example shown in FIG. 4B, the shape is bent into a rectangular shape, and in FIG. 6B, the shape is bent into an arc shape when expanded (in use). The clip 4 is composed of a single continuous steel wire that is formed by bending and is made up of the tip portions 5a and 5b. By the way, the steel wire originally has elasticity, and if the conventional welding end tabs 11a and 11b are pressed while being sandwiched by the ordinary clip 4 simply bent as shown in FIG. The purpose of attaching the welding end tabs can be achieved. However, in such a state, there is a drawback that the tip of the pressed clip is easily displaced and extremely unstable. Therefore, although the mounting itself is simple, it is difficult to prevent the molten metal from flowing out during welding or to eliminate the problems such as the detachment of the welding end tab due to a slight impact during welding.

The present invention solves such a problem, and the fixing method in the present invention is as shown in FIG. That is, the tip portion 5 of the clip is directed toward the inside of the welding line and is fitted into the small hole 2 of the welding end tab 1a as a pressing end. This state is the same on the side of the welding end tab 1b. In such a state, if the clip 4 is pressed firmly, the positional relationship between the tip portion 5 of the clip and the welding end tab surface does not shift even if a considerable impact is applied.

When an annular bent part is provided in the center of the clip, it acts as a spring, so that the pressing force on the welding end tab can be made stronger, and the mounting and dismounting operations can be facilitated. You can

As described above, by the welding end tab fixing method of the present invention, the welding end tab can be easily and firmly attached to the material to be welded, and an extremely sound welded portion can be obtained.

By the way, the welding end tab in the present invention contains a refractory metal oxide as a main component, but does not specify this component, and ordinary silica, alumina, zircon, magnesia, etc. are used, and the shape thereof also has small holes. The same thing as the conventional welding end tab is used except that it is provided. Although the small holes are circular in FIG. 1, the small holes are not particularly limited thereto. The size of the small hole needs to be able to fit the tip of the mounting bracket used, but it is usually 4 to 10 mm.
It is about Φ and the depth is about 1 to 5 mm. The steel wire of the clip usually has a circular cross section of about 2-5 mmΦ,
Other shapes such as a prism may be used. The composition of the steel wire may be ordinary carbon steel, but it is necessary to select it in consideration of the size of the material to be welded, the amount of welding heat input, the presence or absence of preheating, etc., and 1.0 to 9% Cr and 1 to 3% Heat-resistant steel or stainless steel containing Mo is desirable.

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

First, a powdery mixture having a composition of SiO ₂ 45 wt%, Al ₂ O ₃ 35 wt% and MgO 20 wt% is sintered at a high temperature, and the welding end tab of the present invention shown in FIG. 1 and a conventional one shown by 11a in FIG. Both types of welding end tabs were produced. The size and shape of the end tabs in this case are 7 ^t × 35 ^w × 35 ^l prismatic, and the groove for the extra weld metal is 1.0 mm deep and 15 m wide.
m, and the small hole of the end tab of the present invention has a depth of 2.0 mm, 4.0 mmΦ
It is a circular hole.

Furthermore, as a metal fitting for attaching the welding end tab, the second
Three types of clips having the shapes shown in FIGS. (A) and (b) and those shown by 4 in FIG. 5 were prepared. The material used for the clips was a steel wire with a circular cross section of 3.2 mmΦ. The composition was stainless steel in Fig. 2 (a), 50 kg steel in Fig. 2 (b), and 4 in Fig. 5. For this, stainless steel was used.

Plate thickness with these welding end tabs and clips
Butt welding of 25 mm and 250 mm long SM-50B (JIS G3106) steel was performed using CO ₂ semi-automatic arc welding.

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

As shown in Table 2, No. 1 and No. 2 of the present invention example gave good results, while No. 3 and No. 4 of the comparative example fixed the welding end tab to the material to be welded. Inferior in properties, and problems such as casting and the loss of molten metal occurred.

[Advantages of the Invention] As described above, by using the welding end tab fixing method of the present invention, it is possible to attach the end tab to the material to be welded very easily and firmly, and the end tab does not move during welding and is sound. Weld metal can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a welding end tab used in the method of the present invention, and FIGS. 2 (a) and 2 (b) are perspective views for explaining a welding end tab mounting metal fitting used in the method of the present invention.
FIG. 3 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. 5 is a method for using a welding end tab outside the present invention. FIG. 1 ... Welding end tab, 2 ... Small hole, 3 ... Groove, 4 ...
… Mounting brackets (clips), 5a, 5b …… Mounting bracket tips,
6 ... annular bent portion, 7a, 7b ... welded material, 8 ... groove line, 9a, 9b ... run-off tab, 10a, 10b ... groove, 11a, 11b
...... Conventional welding end tabs.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-5255 (JP, A) Actual development 49-63127 (JP, U) Actual public 44-11060 (JP, Y1)

Claims (1)

[Claims] 1. A welding end tab having a recess on the surface opposite to the side for stopping the molten metal is arranged at both ends of the groove, and both ends of the steel wire are inwardly directed toward the end tab surface. Expand the clip that is curved or bent toward both ends of the groove, and insert both ends of the clip into the recesses of the end tabs. A method for fixing an end tab for welding, which comprises pressing and fixing the end tab for welding.