JP2002079377A - Equipment and method for welding stud pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide welding equipment for stud pin, which has an energizing shaft with a stud pin mounted on its tip, which is welded to a steel material, a means rotating the energizing shaft by a motive power and a means energizing for welding to the energizing shaft. SOLUTION: The welding equipment for stud pin has the energizing shaft 12 with the stud pin 3 mounted on its tip, which is welded to the steel material 5, a motor 11 rotating the energizing shaft 12 by the motive power and a switch 15 energizing for welding to the energizing shaft 12. Its welding method has a process pushing the tip of the stud pin 3 on the steel material 5, which is mounted on the energizing shaft 12, a process rotating the energizing shaft 12, rubbing the surface of the steel material 5 with the tip of the stud pin 3 and removing its insulating coating and a process welding the tip of the stud pin 3 to the steel material 5 by energizing the energizing shaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stud pin welding apparatus for attaching and covering a heat insulating material or a fire-resistant heat insulating material to a surface of a structure made of a steel material such as a steel frame or an iron plate coated with corrosion resistance. It relates to the welding method.

[0002]

2. Description of the Related Art For example, a steel frame material of a building is provided with a fire-resistant coating by winding a fire-resistant heat insulating material made of ceramic fibers. In addition, pipes and ducts made of steel, such as plant facilities, are heat-insulated with a ceramic fiber heat insulating material for heat insulation.

A ceramic fiber material such as a rock wool mat is used as the above-mentioned fire-resistant heat insulating material or heat insulating material (hereinafter referred to as a covering material).

[0004] In order to obtain this fire-resistant structure or heat-insulating structure,
The covering material is pressed against a steel material to be protected or kept warm, for example, a T-type steel material or a steel material, and the stud pin is welded to the steel material by a welding gun from above the covering material, thereby forming the covering material through the stud pin. A construction method is adopted in which the steel is pressed against steel and held.

[0005] In this method, there is a problem that the electric current during welding is hindered by the paint or oxide film on the surface of the steel material.

As a method for solving this problem, Patent No. 1
In the technique disclosed in Japanese Patent No. 944636, a stud pin is attached to a welding gun, and the welding gun is rotated by 50 to 90 degrees in a state where the stud pin is pressed against a steel item. The stud pins are welded to the steel material by removing the paint and oxide film, and then conducting electricity.

[0007]

Incidentally, in an outdoor plant facility or the like, there is a case where a steel material is coated with a corrosion-resistant paint thickly. In such a case, in the method in which the stud pin is rotated while being pressed against a steel material, there is a problem that the insulating film does not peel off and hardly peels off, so that the working efficiency is reduced.

In order to solve this problem, the steel material at the place where the stud pin is to be welded may be lightly shaved in advance with a vibrating drill or the like, or the insulating film may be peeled off. .

There is also a method in which the surface of the steel material is polished with a grinder or the like. However, when the coating is fixed, corrosion of the polished portion proceeds after the coating is fixed. Therefore, this method cannot be adopted.

An object of the present invention is to solve the problem relating to removal of an insulating film on the surface of a steel material generated when the above-mentioned stud pin is welded to a steel material by a welding gun.

[0011]

According to a first aspect of the present invention, there is provided an energized shaft having a stud pin welded to a steel material mounted on a tip thereof, and a power supply shaft for powering the energized shaft. And means for energizing the current-carrying shaft for welding.

According to the first aspect of the invention, in a state in which the stud pin attached to the tip of the energized shaft is pressed against the steel material, the energized shaft is energized to rotate the power.
The stud pins are rubbed against the steel material to remove the paint or oxide film, which is an insulating film on the surface thereof, so that subsequent welding can be reliably performed.

Further, since the rotation of the current-carrying shaft is a power rotation, a predetermined insulating film work can be performed without special skill and labor.

As the means for attaching the stud pin to the current-carrying shaft, conventionally known means such as a means by magnetic force, a male / female type fitting means, a screw fitting means, and an engaging pin means can be adopted. As means for power-rotating the energizing shaft, means using a motor can be mentioned.

A second invention is characterized in that a vibration applying means is provided to the energized shaft.

According to the second aspect of the present invention, the stud pins are vibrated by vibrating the energizing shaft, and act together with the rotation of the stud pins, so that the insulating film can be more efficiently removed.

Examples of the vibration applying means include a method using the rotational force of a current-carrying shaft, and a method using a motor for applying vibration or a crimping element.

According to a third aspect of the present invention, the tip of the stud pin is-
It is characterized by being processed into a mold or a + mold.

According to the third aspect, when the stud pin is rotated while being in contact with the steel material, the surface of the steel material can be effectively shaved and the insulating film can be efficiently peeled off.

If the tip of the stud pin is sharp like a needle, it is not preferable because the steel material can be cut only at points and a contact area at the time of welding cannot be secured. Further, if the tip of the stud pin has a simple arc shape, the steel material surface cannot be effectively shaved.

According to a fourth aspect of the present invention, there is provided a step of pressing a tip of a stud pin mounted on a current-carrying shaft against a steel material, and rotating the current-carrying shaft to rub the surface of the steel material with the tip of the stud pin to remove the insulating film. And a step of welding the tip of the stud pin to the steel material by energizing the current-carrying shaft.

According to the fourth aspect of the present invention, the stud pin is mounted on the welding device, and the energizing shaft is rotated while the tip of the stud pin is in contact with the steel material. The insulating film on the surface can be efficiently and easily removed, and then the energization is performed to weld the stud pins to the surface of the steel material, thereby simplifying the entire work process.

According to a fifth aspect of the present invention, in the step of pressing the tip of the stud pin against a steel material, the stud pin penetrates by inserting a coating material applied to the steel material, and a coating material is provided at a base end of the stud pin. , And a corrosion-resistant paint is applied to the surface of the steel material.

According to the fifth aspect, in the step of keeping the surface of the steel material coated with the corrosion-resistant paint warm with the coating material, the stud pin can be welded while the coating material is pressed against the steel material. The coating material can be easily fixed to the steel material by the pin.

Further, since the paint only at the welding portion of the stud pin can be removed by the rotating action of the current-carrying shaft of the welding device of the present invention immediately before welding, the surface of the steel material is protected in advance by a sufficient corrosion-resistant treatment, usually with a corrosion-resistant paint. A coating can be applied.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a stud pin welding apparatus of the present invention, FIG. 2 is a partially cutaway perspective view showing a stud pin, and FIG. 3 is a schematic sectional view of a step of covering the surface of a steel material with a heat insulating material. , (A) is a schematic sectional view showing a steel material provided with a heat insulating material, (b) is a schematic sectional view showing a time when a welding gun is used, and (c) is a schematic sectional view showing a steel material provided with a stud pin. 4A and 4B show an example of mounting a stud pin on an energized shaft. FIG. 4A shows a first example, FIG. 4B shows a second example, and FIG.
Is a third example.

The present invention is most suitable for a step of welding a stud pin for holding a steel material by applying the coating material to the steel material when coating the surface of the steel material with a fireproof coating material or a heat insulating material. .

In this case, a coating material for fireproof coating or heat insulating coating is temporarily placed on the surface of the steel material. Usually, the coating material is simply pressed against the steel material, and a stud pin is inserted in that state. In a state where the pin is brought into contact with the steel material by penetrating the coating material, the current-carrying shaft of the welding device is rotated to remove the insulating film on the surface of the steel material. Next, the stud pin is welded to the steel material by turning on the welding device.
The coating material is fixed on the surface of the steel material.

When the surface of the steel material is coated with the coating material as described above, it is not possible to perform a corrosion-resistant treatment on a portion except for a welded portion. For this reason, anticorrosion treatment is performed on the part by applying anticorrosion paint in advance. Therefore, a method capable of removing a paint film that is a corrosion-resistant coating only on a welded portion as in the present invention is an optimal method.

Further, the present invention is not limited to the above-described fixing and fixing of the covering material to the steel material by using stud pins, but can be used for mounting stud bolts.

A welding gun 1 as a welding device shown in FIG.
An energizing shaft 12 rotated by a motor 11 is provided in the main body 10, and a magnet chuck 2 is attached to a tip of the energizing shaft 12. Reference numeral 13 denotes a grip portion of the main body 10, which is provided with a start button 14 for operating the welding gun 1, a trigger type switch 15, and the like.

The magnet chuck 2 has a structure in which the stud pins 3 can be mounted. More specifically, the washer 4 having a locking hole 40 for locking the large-diameter base end portion 31 of the stud pin 3 whose tip is machined into the negative shape or the positive shape 30.
Is provided. The washer 4 is provided with a recess 41 for fitting a rectangular metal sheet into the magnet chuck 2 as shown in the figure, and each edge 42, 42,... Is formed.
The stud pin 3 can be attached to the energizing shaft 12 via the washer 4 by the suction force of the stud pin 3.

As described above, the magnetic chuck 2 has a function of attracting the washer 4 by the magnetic force and transmitting the rotational force of the power supply shaft 12 to the stud pin 3 by fitting into the recess 41 of the washer 4.

The washer 4 also has a function as a stopper for holding down the coating material on the steel material. The energizing shaft 12 and the magnet chuck 2 are made of a good metal conductor.

Next, the steps of using the welding gun 1 of the present invention will be described with reference to FIG. This process can be used for the construction of heat insulation structures such as ducts, pipes, and furnaces in plant construction such as power plants and incinerators. Further, here, a material in which a paint is applied to the surface of a steel material for corrosion resistance processing is used, and examples of the steel material include an exterior material of a duct or a pipe.

First, a heat insulating material 6 is applied as a coating material to the surface of the steel material 5 (FIG. 3A). Examples of the heat insulating material 6 include a material made of rock wool or the like in a mat shape.

As shown in FIG. 3A, the stud pins 3 are attached to the magnet chuck 2 of the welding gun 1, and the stud pins 3 are inserted into the heat insulating material 6 and penetrated through the heat insulating material 6 (FIG. 3B). ), The tip of the stud pin 3 is brought into contact with the steel material 5. In this case, the welding gun 1 simply has to insert the tip of the stud pin 3 into the heat insulating material 6.

Next, in order to start the motor 11 of the welding gun 1, the start button 14 is pressed to rotate the energized shaft 12, so that the stud pin 3 is driven through the energized shaft 12.
Is rotated, the tip 30 of the stud pin 3 comes into contact with the surface of the steel material 5, the paint on the surface of the steel material 5 in contact with the tip 30 of the stud pin 3 is scraped off, and the paint is removed.

With the removal of the paint, the stud pins 3 and the steel material 5 are electrically contacted. In this contact state, when the switch 15 is turned on and power is supplied to the power supply shaft 12, the tip of the stud pin 3 is welded to the steel material 5.

When the switch 15 is turned off, the power supply to the power supply shaft 12 is stopped, and the welding gun 1 is pulled forward, the welding gun 1 and the stud pin 3 are attached by the magnetic force of the magnet chuck 2. The welding gun 1 can be easily separated from the stud pin 3.

In this way, the heat insulating material 6 is pressed and supported by the washer 4 at the base end of the stud pin 3, and the heat insulating material 6 fixed to the steel material 5 is obtained (FIG. 3C). ).

Here, the means for mounting the stud pin 3 on the energizing shaft 12 will be described. In the above-described embodiment, an example in which the magnet chuck 2 is used as the mounting means by magnetic force is described. However, an example shown in FIG. 4 will be described as another mounting means.

In the first example shown in FIG. 4A, a male projection 21 is formed substantially at the center of the front surface 20 of the magnet chuck 2, and the base end 31 of the stud pin 3 is correspondingly formed.
A female recess 32 is formed in the male projection 21 and the female recess 32.
The stud pin 3 is mounted on the energizing shaft 12 via the magnet chuck 2 by fitting. The magnet chuck 2 may alternatively be a simple polygonal support. Hereinafter, the same applies.

In the second example shown in FIG. 4B, the male screw portion 22 is formed on the male projection 21 and the female screw portion 3 is formed on the female recess 32 of the above example.
3 is an example in which each is formed and screwed together. In the third example shown in FIG. 4C, a plurality of engagement pins 23 are formed at substantially the center of the front surface 20 of the magnet chuck 2, and the base end 3 of the stud pin 3 is correspondingly formed.
In this example, a plurality of engagement holes 34 are formed in one, and these are engaged with each other, and the stud pins 3 are attached to the energizing shaft 12 via the magnet chuck 2.

Here, as an example of the method of fixing the stud pin 3 to the welding gun 1, an example is shown in which the magnet chuck 2 which is easy to fix and remove is used, but the stud pin 3 can be easily fixed to the energized shaft 12. In addition, the rotating force of the energized shaft 12 can be transmitted to the stud pin 3, the energization between the energized shaft 12 and the stud pin 3 can be reliably ensured, and the energized shaft 12 can be easily removed from the stud pin 3 after welding the stud pin 3. Other structures can be adopted as long as the structure can be used. For example, in the structure shown in FIG. 4C, a simple metal body (this metal body secures a contact area with the washer 4) is arranged instead of the magnet chuck 2, and the metal male screw part 22 and the female screw Energized shaft 12 in part 33
And secure the stud pins 3 and electrical contact,
The structure in which the current-carrying shaft 12 is separated from the stud pin 3 by reversely rotating the current-carrying shaft 12 after welding may be employed.

[0046]

The stud pin can be easily welded to a steel material by employing the welding device of the present invention. In particular, when a coating material such as a heat insulating material is coated on the surface of a steel material to which a paint is applied, an operation of driving and fixing a stud pin for fixing through the coating material can be easily performed.

Further, by employing the welding method of the present invention, it is possible to easily remove the insulating film on the surface of the steel material by using the stud pins and weld the stud pins to the steel material. In addition, when the coating material is applied to the surface of the steel material, the coating material can be easily welded and fixed via the fixing stud pins.

[Brief description of the drawings]

FIG. 1 is a side view showing a stud pin welding device of the present invention.

FIG. 2 is a partially cutaway perspective view showing a stud pin.

3A and 3B are schematic cross-sectional views of a step of coating the surface of a steel material with a heat insulating material, wherein FIG. 3A is a schematic cross-sectional view showing a steel material provided with a heat insulating material, and FIG. Schematic sectional view,
(C) is the schematic sectional drawing which shows the steel material which gave the stud pin.

FIG. 4 shows an example of mounting stud pins on a current-carrying shaft;
(A) is the first example, (b) is the second example, and (c) is the third example.
Example.

[Explanation of symbols]

 3 Stud pin 5 Steel 11 Motor 12 Energized shaft 15 Switch

Claims (5)

[Claims] 1. A power supply shaft having a stud pin welded to a steel material mounted on a tip thereof, means for rotating the power supply shaft by power, and means for supplying power to the power supply shaft for welding. A stud pin welding device. 2. The stud pin welding apparatus according to claim 1, wherein vibration applying means is provided on the energized shaft. 3. The stud pin welding apparatus according to claim 1, wherein a tip of the stud pin is machined into a minus shape or a plus shape. 4. A step of pressing a tip of a stud pin mounted on a current-carrying shaft against a steel material, and a step of rotating the current-carrying shaft to rub the surface of the steel material with the tip of the stud pin to remove an insulating film thereof. Energizing the energized shaft to weld the tip of the stud pin to a steel material. 5. A step of pressing the tip of a stud pin against a steel material, wherein the stud pin inserts and penetrates a coating material applied to the steel material, and the base material of the stud pin presses the coating material. The stud pin welding device according to claim 4, wherein a washer is provided, and a corrosion-resistant paint is applied to a surface of the steel material.