JPH0217745Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an arc welding stud mainly used for attaching a lining material to a metal plate.

[Conventional technology]

Conventionally, the above types of studs had a constriction at one location of the shaft whose upper end was attached to an arc welding gun, and a tapered protrusion at the lower end of the shaft. . Such studs are
After the lower end of the shaft is welded to the metal plate together with the projection, the shaft above the constriction is torn off from the constriction and discarded.

[Problem that the invention attempts to solve]

However, the length of the shaft at the top of the constriction must be long enough to be held in the arc welding gun, and the actual dimension needs to be more than ten millimeters. Discarding the shaft is
Approximately half of each shaft body must be discarded, which is uneconomical. In addition, conventionally, a single shaft could only be used for arc welding at one location, and it was necessary to replace the shaft on the arc welding gun each time a different location was to be welded. There was a problem that the replacement work was troublesome.

The present invention was devised to solve these problems, and its purpose is to provide a stud that can be arc welded at multiple locations, although it is composed of a single shaft.

[Means for solving problems]

In order to solve the above problems, the stud of the present invention has a shaft body whose upper end is attached to an arc welding gun, which is provided with constrictions that can be separated at multiple locations, and a tapered constriction at the lower end of the shaft body. The gist is that a protrusion of the shape is provided.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As illustrated in FIG. 1, the stud of the present invention is provided with a tapered projection 2 at the lower end of a shaft body 1,
In addition, narrow portions 3a, 3b, 3 are provided at multiple locations on the shaft body 1.
c is provided. In this shaft body 1, the portion above the uppermost constricted portion 3a becomes a head 1a that is held by an arc welding gun. Further, the part below the constricted part 3a is divided into three equal parts by constricted parts 3b and 3c, and these are divided into three parts in order from the bottom: a first shaft part 1b, a second shaft part 1c, and a third shaft part 1d. The shaft is arc welded to the metal plate.

Figure 2 shows the shaft 1 described above in the arc welding gun 4.
The upper end portion, that is, the head portion 1a is held, and the first shaft portion 1b is pressed against the metal plate 5 on which the lining material A is applied. In the figure, 6 is a holding cylinder for holding the shaft body 1, and 7 is an expandable shield support cylinder. At the lower end of this shield support cylinder 7 is an arc shield that helps in shaping the excess weld and slowly cooling the welded part. 8 is installed. When a predetermined voltage is applied to the shaft body 1 from this state, the lower end portion of the shaft body 1 including the protrusion 2 and the metal plate 5 are arc welded.

After arc welding the first shaft portion 1b in this manner, the second shaft portion 1c and the third shaft portion 1d are peeled off from the first shaft portion 1b to separate the constricted portion 3c. It is useful for the shield support tube 7 to be configured to be expandable and retractable for dividing the constricted portion 3c. That is, the shield support tube 7 is contracted so that its lower end faces the second shaft portion 1c,
From this state, by tilting the arc welding gun, the shield support tube 7 can be attached to the constriction 3 as shown in FIG.
The second shaft portion 1c and the third shaft portion 1d above c can be peeled off from the first shaft portion 1b. When the constricted portion 3c is separated from the first shaft portion 1b, the constricted portion 3c is located at the lower end of the shaft body 1, and this constricted portion 3c performs the same function as the above-mentioned protrusion 2. The shaft portion 1c can be arc welded to other locations on the metal plate 5. Similarly, after arc welding the second shaft portion 1c, the third shaft portion 1d can be arc welded by dividing the constricted portion 3b.

The shaft body 1 explained in FIGS. 1 to 3 has thread grooves on its first shaft portion 1b, second shaft portion 1c, and third shaft portion 1d, and after arc welding, a nut 20 is used to press the lining material A. is now being installed.

FIG. 4 illustrates the expansion and contraction mechanism of the shield support cylinder 7. That is, the telescopic mechanism shown in the figure moves the shield support tube 7 to the upper tube body 7 supported by the arc welding gun.
a and a lower cylindrical body 7b, a spiral groove 8 is formed in the upper cylindrical body 7a, and a plurality of projections 9 are formed in the lower cylindrical body 7b to be slidably fitted into the grooves 8, Further, concave portions 8a are formed at a plurality of locations in the groove 8 at intervals of 45 degrees. Then, a protrusion 9 is placed in the groove 8.
When the lower cylindrical body 7b is rotated 45 degrees clockwise or counterclockwise, the lower cylindrical body 7b rotates as described above with respect to the upper cylindrical body 7a. It is adapted to move upward or downward by the length of the triaxial portion 1d. Note that if the projection 9 is fitted into the recess 8a, rotation of the lower cylinder 7b is prevented. In addition, the upper cylinder 7a and the lower cylinder 7b may be threaded so that they can be expanded and contracted by rotation, or they may simply be slid in the vertical direction.

FIG. 5 shows a modification of the shaft. The shaft body 1 shown in the figure has flanges 10b, 10c, and 10d formed on the first shaft portion 1b, the second shaft portion 1c, and the third shaft portion 1d, respectively, and constricted portions 3 at multiple locations on the shaft body 1.
It is the same as that shown in FIG. 1 in that a, 3b, and 3c are formed and that the upper end of the shaft body 1 is the head 1a. In such a shaft body 1, the first shaft portion 1
b, at the time when the second shaft part 1c or the third shaft part 1d is arc welded, the flange parts 10b, 10c, 10
The lining material is pressed against the metal plate by d, which saves the effort of tightening the nuts later.

[Effect of idea]

As is clear from the above, the stud of the present invention has multiple parts to be arc welded to the metal plate, and these parts are separated by separable constrictions. It becomes possible to stud weld multiple locations with a single attached shaft. Therefore, work efficiency is greatly improved compared to the conventional method in which it was necessary to replace the shaft body for each welding location. Further, even if the upper end portion of the shaft body held in the arc welding gun is discarded, the amount thereof is drastically reduced compared to the conventional method, which is advantageous in terms of resource saving.

[Brief explanation of drawings]

Fig. 1 is an overall side view of a stud according to an embodiment of the present invention, Fig. 2 is a side view showing the state in which the stud is used, Fig. 3 is a partial side view showing a state in which the constriction is divided, and Fig. 4 The drawing is a partially cutaway side view illustrating the expansion and contraction mechanism of the seal support tube, and FIG. 5 is an overall side view showing a modified example of the stud. 1... Shaft body, 1a... Head, 1b... First shaft part, 1c
...Second shaft part, 1d...Third shaft part, 2...Protrusion, 3a,
3b, 3c... Narrow portion.

Claims (1)

[Scope of utility model registration request] A stud for arc welding, comprising a shaft body whose upper end is attached to an arc welding gun, which is provided with constricted parts that can be separated at a plurality of locations, and a tapered projection is provided at the lower end of the shaft body.