JP6473343B2 - Slag adhesion preventing liquid applicator and welding method - Google Patents

Description

  The present invention relates to an applicator for applying a weld spatter adhesion inhibitor to a surface to be welded.

In particular, when a stud is welded to a surface-treated steel sheet containing a large amount of zinc, such as a hot-dip galvanized steel sheet or a ZAM steel sheet (registered trademark of Nisshin Steel Co., Ltd.), a large amount of slag adheres around the weld. That is, as shown in FIG. 8, when the stud 12 is welded onto the surface to be welded 3, the slag 18 adheres to the outer periphery of the welded portion. Even if this slag 18 is simply wiped with a waste cloth or the like, it cannot be wiped off.
In addition, in order to prevent the slag from occurring during welding, air is blown from the inside of the welding gun toward the stud tip to blow the slag, but the slag 18 cannot be blown away. Slag 18 adheres around the stud.

In order to prevent the slag from adhering, there has conventionally been a slag adhesion preventing liquid. The slag adhesion preventing liquid includes an aqueous solution based on water and an aqueous solution based on an insoluble solvent.
When the insoluble solvent is applied to the steel sheet, the welding work can be performed immediately after the application, and the workability is excellent. However, it has a strong odor and toxicity and has a problem in terms of safety. On the other hand, water-based materials are excellent in safety, but welding directly after application causes welding defects such as blow holes. Therefore, after application, a drying process is necessary, and there is a drawback that workability is poor.
As a slag adhesion preventing liquid based on water, there is a composition in which porous silica particles and polyvinyl alcohol are mixed with water and dispersed to form a thriller. In order to apply these slag adhesion preventing liquids to the steel sheet, it has been performed with a sprayer or a brush.

JP 2004-276104 A

An object of the present invention is to provide an applicator that can immediately perform a welding operation without requiring a drying step even when a dedicated aqueous slag adhesion preventing liquid based on water that does not have odor and toxicity is used.
Further, regarding the slag removal, the inventors' experiments have shown that slag can be removed even if a commercially available soap or detergent having a surface-active action is used as the aqueous slag adhesion preventing liquid. Therefore, an object of the present invention is to provide a method capable of removing slag using an inexpensive liquid detergent having a surface active action.

The invention according to claim 1 comprises an applicator body (1),
An annular liquid supply (2) provided around the center of the lower end of the applicator body (1);
Comprising
In a state where the liquid is attached to the liquid supply (2), the liquid supply (2) is brought into contact with the surface to be welded (3),
A slag adhesion preventing liquid applicator configured to form an annular liquid adhesion portion (4) on the welded surface (3).

The invention according to claim 2 is the applicator according to claim 1,
The paper liquid (2) is made of water-absorbing material such as rubber or sponge, the lower end surface (2a) is a sprayer slag release liquid, characterized in that it is flat.

The invention according to claim 3 is the applicator according to claim 1 or 2,
This is a slag adhesion preventing liquid applicator having a through hole (14) penetrating the central axis of the applicator main body (1).

Invention of Claim 4 in the method of welding using the applicator of the slag adhesion prevention liquid in any one of Claims 1-3,
Attaching a liquid to the surface of the liquid supply (2), contacting the surface to be welded (3), and forming the liquid adhering portion (4) in an annular shape on the surface to be welded (3); ,
Welding at the center of the liquid adhering portion (4).

The invention according to claim 5 is the welding method according to claim 4,
A welding method comprising the step of bringing the lower surface of the liquid supply (2) of the applicator main body (1) into contact with the liquid supply pad (7) and attaching the liquid to the liquid supply (2) It is.

The invention according to claim 6 is the welding method according to claim 5,
In the automatic welding machine (24) having the welding robot (21), the applicator (10) and the liquid supply pad (7) are arranged in advance,
After the step of holding the applicator main body (1) by the welding robot (21) and bringing the liquid supply (2) into contact with the liquid supply pad (7),
In this welding method, the liquid adhering portion (4) is formed on the welded surface (3), and a stud (12) is welded to the center thereof.

The invention according to claim 7 is the welding method according to claims 4 to 6,
This is a welding method using a soap or detergent having a surface active action as a slag adhesion preventing liquid.

The applicator of the present invention is such that an annular liquid adhering portion 4 can be formed by contacting the welded surface 3 with the liquid adhering to the annular liquid supply 2 of the applicator main body 1. It is.
For this reason, when welding is performed at the center of the annular liquid adhesion portion 4, the slag scattered during welding is captured by the liquid adhering in an annular shape. Thereafter, if the liquid is wiped off, the slag can be removed from the surface to be welded. Since the liquid adhesion part 4 at this time is formed in an annular shape, when the stud or the like is welded to the center thereof, the adhered liquid does not interfere with the welding. Therefore, immediately after forming the liquid adhesion part 4, welding becomes possible and a quick welding operation can be performed.

The invention according to claim 2, the feed liquid 2, formed of a liquid absorbing material such as rubber or sponge, the lower end surface 2a is obtained by flat. Therefore, the slag adhesion preventing liquid can be easily adhered to the surface of the liquid supply liquid 2 and transferred to the surface to be welded 3 so that the workability is good.

  According to the third aspect of the present invention, a through hole 14 having a central axis is formed at the center of the lower end of the applicator main body 1. Therefore, the liquid adhering to the liquid supply 2 can be easily transferred to the welded surface 3. Moreover, when the through-hole 14 is formed, the center position can be visually observed from the through-hole 14, and the liquid adhesion part 4 can be formed reliably around the welding position.

  In the welding method according to claim 4, a liquid is attached to the surface of the liquid supply 2, the liquid is attached to the surface to be welded 3, and an annular liquid attaching portion 4 is formed on the surface to be welded 3. This is a method of welding. The presence of the annular liquid adhering portion 4 can prevent the outer periphery of the surface to be welded from being soiled, and welding can be performed quickly.

  In the welding method according to the fifth aspect, the lower surface of the liquid supply 2 of the applicator main body 1 is brought into contact with the liquid supply pad 7 and the liquid is adhered thereto. Therefore, an appropriate amount of liquid can be quickly attached to the liquid supply 2, and it can be quickly transferred to the surface to be welded.

According to the sixth aspect of the present invention, the applicator 10 and the liquid supply pad 7 are arranged in the welding robot, the applicator main body 1 is held by the welding robot, and the liquid supply 2 is supplied to the liquid supply pad. 7, the liquid adhesion portion 4 is formed on the surface 3 to be welded, and the stud 12 is welded to the center thereof. Therefore, also in the automatic welding machine, the contamination of the welded surface 3 can be prevented quickly.

  According to the seventh aspect of the present invention, a soap or detergent liquid having a surface active action is used as a slag adhesion preventing liquid, so that it can be used inexpensively and easily without using a special spatter adhesion preventing liquid. .

The perspective view of the applicator 10 and the liquid supply pad 7 of the present invention. The longitudinal cross-sectional view which shows the use condition of the applicator 10 and the pad 7. FIG. Explanatory drawing which shows the process of attaching spatter prevention liquid to the to-be-welded surface 3 using the applicator 10. FIG. The top view of the liquid adhesion part 4 at the time of making the liquid adhere. (A) to (C) sequentially show the procedure for welding the stud 12 after the liquid adhesion portion 4 is adhered on the surface 3 to be welded, and (D) shows the slag 18 after the welding. Explanatory drawing which shows the state wiped off with. FIG. 6 is a perspective view showing the state of FIG. Explanatory drawing which used the applicator 10 of this invention for the automatic welding machine 9. FIG. Explanatory drawing of the slag 18 produced on the outer periphery of the welding part, when the stud 12 is welded on the to-be-welded surface 3. FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a perspective view of the applicator 10 of the present invention and a liquid supply pad 7 used therefor. FIG. 2 is an explanatory diagram showing the preparation stage of the method of the present invention.
The applicator 10 has an applicator main body 1 and a liquid supply 2. As shown in FIG. 2, the applicator main body 1 has a lower end surface formed in a cylindrical shape with an inner flange, and a through hole 14 is formed in the center of the lower end surface. A hole 5 having an inner diameter larger than the inner diameter of the through hole 14 is formed above the through hole 14. The hole 5 may be formed to have the same inner diameter as that of the through hole 14 with a smaller inner diameter.
Further, an annular groove is formed on the lower end surface of the applicator 10 on the radially outer side of the through-hole 14, and a liquid supply 2 made of a liquid-absorbing material such as sponge or rubber is fitted into the lower end surface. 2a protrudes from the lower surface of the applicator body 1 and is formed flat. 5A, when the supply body 2 of the applicator main body 1 is pressed against the surface to be welded 3 as shown in FIG. 5A, only the front end surface 2a of the supply body 2 is in contact with the surface to be welded 3. .

Next, the liquid supply pad 7 adheres the slag adhesion preventing liquid 22 to the liquid supply 2 of the applicator 10. The pad 7 includes a pad main body 13, a sponge 15 accommodated therein, and a slag adhesion preventing liquid 22. Then, with the slag adhesion preventing liquid 22 contained in the sponge 15, the applicator 10 is pressed against the sponge 15 as shown in FIG.
Then, the slag adhesion preventing liquid 22 is adhered to the liquid supply 2 of the applicator 10.

Next, as shown in FIGS. 3 and 5A, with the welding position of the surface 3 to be welded at the center 17, the liquid supply 2 of the applicator 10 is brought into contact, and the slag adhesion preventing liquid 22 adhering to the surface is applied. Transfer onto the welding surface 3. At this time, if the through-hole 14 is provided in the applicator main body 1, the welding position can be seen through the through-hole 14 manually, and the slag adhesion preventing liquid 22 is stamped at an accurate position as shown in FIG. Can be transferred.
Then, in the state of FIG. 5B, the tip of the stud 12 is positioned at the center thereof, and a welded portion 19 is formed as shown in FIG. At this time, the slag 18 scatters from the outer periphery of the welded part 19, but it floats on the liquid adhesion part 4.
Therefore, if the slag 18 is removed together with the liquid adhering portion 4 by using a waste cloth or the like, good-looking welding with minimal spatter traces is completed as shown in FIGS. Moreover, by doing in this way, a welding operation can be performed rapidly.

Next, FIG. 7 shows an application of the applicator 10 and the liquid supply pad 7 of the present invention to an automatic welding machine 24. The applicator 10 and the liquid supply pad 7 are arranged at appropriate positions on the automatic welding machine 24, the applicator 10 is gripped by the robot 21 moving on the XY table 20, and the end surface thereof contacts the liquid supply pad 7. In this state, it is contacted with the surface of the work 23 to form the liquid adhesion portion 4. The stud 12 can be automatically welded to the center.
In the case of the automatic welding machine 24, the through hole 14 does not need to be provided in the applicator main body 1 in order to accurately position the welding position by the automatic control device.

In this example, an example in which an aqueous slag adhesion preventing liquid is used is shown, but the slag adhesion preventing liquid of the present invention is not limited thereto and may be oily.
Also, in the case of surface-treated steel sheets containing a large amount of zinc, it is best to stud weld immediately after transferring the aqueous slag adhesion prevention liquid, but wipe it in a wet state, but surface-treated steel sheets with low zinc content such as electrogalvanized steel sheets In this case, it is possible to perform stud welding or wiping after waiting for the drying.
Furthermore, it is also possible to use a commercially available soap or detergent liquid having a surface active action as the slag adhesion preventing liquid. For example, it was possible to remove slag after welding even when the dishwashing detergent “Mama Lemon (trademark of Lion Co., Ltd.)” was used as a slag adhesion preventing liquid.

1 Applicator body 2 Liquid supply
2a Lower end surface 3 Welded surface 4 Liquid adhering part 5 Hole 7 Liquid supply pad
10 Applicator
12 Stud
13 Pat body
14 Through hole
15 sponge

17 center
18 Slag
19 Welded part
20 XY table
21 Welding robot
22 Slag adhesion prevention liquid
23 Workpiece
24 automatic welding machine

Claims (7)

Applicator body (1),
An annular liquid supply (2) provided around the center of the lower end of the applicator body (1);
Comprising
In a state where the liquid is attached to the liquid supply (2), the liquid supply (2) is brought into contact with the surface to be welded (3),
A slag adhesion preventing liquid applicator configured to form an annular liquid adhesion portion (4) on the welded surface (3). The applicator according to claim 1, wherein
The paper liquid (2) is made of water-absorbing material such as rubber or sponge, applicator slag release liquid to the lower end surface (2a) is characterized by being flat. The applicator according to claim 1 or 2,
A slag adhesion preventing liquid applicator having a through hole (14) penetrating the central axis of the applicator body (1). In the method of welding using the applicator of the slag adhesion prevention liquid in any one of Claims 1-3,
Attaching a liquid to the surface of the liquid supply (2), contacting the surface to be welded (3), and forming the liquid adhering portion (4) in an annular shape on the surface to be welded (3); ,
Welding at the center of the liquid adhering portion (4). The welding method according to claim 4,
A welding method comprising the step of bringing the lower surface of the liquid supply (2) of the applicator main body (1) into contact with the liquid supply pad (7) and attaching the liquid to the liquid supply (2) . The welding method according to claim 5,
In the automatic welding machine (24) having the welding robot (21), the applicator (10) and the liquid supply pad (7) are arranged in advance,
After the step of holding the applicator main body (1) by the welding robot (21) and bringing the liquid supply (2) into contact with the liquid supply pad (7),
A welding method in which the liquid adhesion part (4) is formed on the welded surface (3) and a stud (12) is welded to the center thereof. In the welding method of Claim 4-6,
A welding method using a soap or detergent having a surface active action as a slag adhesion preventing liquid.

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