JPH11291047A - Spatter automatic removing nozzle for arc welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the stuck spatter on the inner surface of a gas nozzle and to enable stable welding in a long term by fitting the gas nozzle so as to be freely attached/detached, surrounding a contact tip, connecting a fluid supplying tube feeding the fluid of the air etc., for blowing off the spatter toward the tip opening part from the base part side of the gas nozzle and forming an inert gas outlet in a tip holder. SOLUTION: The tip holder 2 fitting the contacting tip at the tip part 1, is inserted and held into the cylindrical hole part in a nozzle holding part 4. The tip part of the cylindrical hole part in the nozzle holding tool 4 is composed of a frontward diameter expanding part 4a having almost the same diameter as the inner diameter of the gas nozzle 3 and a frontward enlarging-state reverse-tapered cylindrical part 4b connected with the fluid supplying tube 6. The gas nozzle 3 is desirable to form of a ceramic material or a carbon. The inert gas is spouted from an inert gas outlet 7 and made to flow out from the tip opening part to form the air curtain of the inert gas surrounding a welding fused pond. The spatter is blown off by intermittently making to flow the high pressure air from the fluid supplying tube 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic spatter removing nozzle for arc welding which can prevent spatter from adhering to a gas nozzle.

[0002]

2. Description of the Related Art Conventionally, in arc welding, it is usual to shut off a weld pool at the time of welding with an inert gas in order to protect the weld pool from the atmosphere. At this time, a sputter for arc welding in which the contact tip is surrounded by a cylindrical gas nozzle so that the inert gas flows along the inner wall of the gas nozzle so that the inert gas can be accurately supplied to the weld pool without diffusing. Automatic removal nozzles are commonly used.

[0003] However, during welding, a large amount of spatter is generated and scattered from the molten portion and adheres to the inner surface of the gas nozzle, thereby deteriorating the flow of the inert gas and generating blowholes. there were. Also, recently, unattended automatic welding using a robot or the like has been performed, and the problem of the spatter adhesion phenomenon becomes a bottleneck in performing fully automatic welding for a long time. there were.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, prevents spatter from adhering to the inner surface of a gas nozzle, and enables stable welding for a long period of time. The object of the present invention is to provide an automatic spatter removing nozzle for arc welding, which can be applied to unattended automatic welding and can achieve a large labor saving and cost reduction.

[0005]

Means for Solving the Problems An automatic spatter removing nozzle for arc welding according to the present invention made to solve the above-mentioned problem is an automatic spatter removing nozzle for arc welding in which a contact tip is surrounded by a cylindrical gas nozzle. A fluid supply pipe for sending a fluid such as air for blowing off a sputter from a base side of the gas nozzle toward a tip end opening is connected. In order to embody such an automatic spatter removing nozzle for arc welding, a tip holder having a contact tip attached to the tip is inserted into a cylindrical hole of a nozzle holder to which a fluid supply pipe is connected to a side surface of a forward end. Normally, a cylindrical gas nozzle surrounding the contact tip is detachably attached to the tip of the nozzle holder, and this is the invention according to claim 2. Further, in the present invention, in order to improve the flow of the fluid for blowing off the sputter, the fluid supply pipe is connected to the forward end of the cylindrical hole portion of the fluid nozzle holder with the forward enlarged portion having substantially the same diameter as the inner diameter of the gas nozzle. It is preferable that a tapered cylindrical portion having a divergent shape be continued.
Further, in each of the above-mentioned inventions, the invention in which the gas nozzle is formed of a ceramic material or a carbon material is the invention according to claim 4.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a contact tip attached to the tip of a tip holder 2, 3 denotes a cylindrical gas nozzle surrounding the contact tip 1, 4 denotes a nozzle holder for holding the gas nozzle 3, and 5 denotes a nozzle holder for the gas nozzle 3. 4 is a screw-type nozzle fastening member for fixing to the nozzle 4. A tip holder 2 having a contact tip 1 exchangeably attached to the tip thereof has a gas nozzle 3
Nozzle holder 4 connected to a fluid supply pipe 6 for sending a fluid for blowing off the spatter from the base side of the nozzle toward the tip opening.
The above-mentioned cylindrical gas nozzle 3 is detachably attached by the above-mentioned screw-type tightening member 5 by bringing the base flange portion into contact with the tip of the nozzle holder 4. Mounted on

The cylindrical hole of the nozzle holder 4 has a forward enlarged portion 4a having substantially the same diameter as the inner diameter of the gas nozzle 3 so that the forward portion of the cylindrical hole improves the flow of the fluid for blowing off the sputter. The fluid supply pipe 6 is formed of a tapered cylindrical portion 4b with a divergent shape connected thereto, and the base end of the cylindrical hole is a tip holder holding portion 4c. In addition, a gas cylinder (not shown) is connected to the inside of the tip holder 2, and an inert gas supplied from the gas cylinder is blown out from the inert gas outlet 7, flows along the inner wall of the gas nozzle 3, and flows out from the tip opening. By forming an inert gas air curtain around the weld pool, the weld pool is shielded from the atmosphere, and the welding process is performed while protecting the weld pool.

Although the material of the gas nozzle 3 is not particularly limited, it is preferable to use a ceramic material or a carbon material to which spatter is difficult to adhere due to the characteristics of the material. When used together with a fluid supply for use, a stable welding process can be performed for a longer period of time.

As described above, in the present invention, the fluid supply pipe 6 for blowing off the sputter is connected to the base side of the gas nozzle 3, and the fluid such as high-pressure air flows intermittently from the fluid supply pipe 6. It is characterized in that it is configured to blow off sputter attached to the inner surface of the nozzle. In addition, in addition to high-pressure air, for example, an inert gas such as carbon dioxide gas or argon can also flow from the fluid supply pipe 6, and in this case, the inert gas also acts as a refrigerant,
This is preferable because the effect of increasing the durability by cooling the contact tip 1 and the gas nozzle 3 can be exhibited.

The nozzle having such a configuration is used as an automatic spatter removing nozzle for arc welding according to a conventional method. In this case, an inert gas is supplied from an inert gas outlet 7 of the tip holder 2. Flow from the opening of the tip of the gas nozzle 3 to form an inert gas air curtain around the weld pool, so that the welding process can be performed accurately while protecting the weld pool in a state of being shielded from the atmosphere. Become. Further, by flowing high-pressure air intermittently at regular intervals from the fluid supply pipe 6, spatters attached to the inner surface of the nozzle are completely blown off, and the inner surface of the nozzle is always kept in a smooth state. However, the flow welding molten pool is always stable and does not cause defects such as blowholes. As a result, high-quality and stable welding can be performed over a long period of time, and further, since maintenance is unnecessary, it is possible to incorporate the welding into an unmanned automatic welding device using a robot or the like.

[0011]

As is apparent from the above description, the present invention can prevent a spatter from adhering to the inner surface of a gas nozzle, perform stable welding for a long time, and can be applied to unmanned automatic welding. It is possible to greatly reduce labor and cost. Therefore, the present invention is extremely useful as an automatic spatter removing nozzle for arc welding that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact tip 2 Tip holder 3 Gas nozzle 4 Nozzle holding tool 4a Increasing diameter part 4b Increasing taper cylinder part 6 Fluid supply pipe

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[Procedure amendment]

[Submission date] March 4, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

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[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

Means for Solving the Problems An automatic spatter removing nozzle for arc welding according to the present invention made to solve the above-mentioned problem is an automatic spatter removing nozzle for arc welding in which a contact tip is surrounded by a cylindrical gas nozzle. A fluid supply pipe for sending fluid such as air for blowing off the sputter from the base side of the gas nozzle toward the tip opening is connected .
And a tip holder for attaching the contact tip.
The die is characterized in that an inert gas outlet is formed . In order to embody such an automatic spatter removing nozzle for arc welding, a tip holder having a contact tip attached to the tip is inserted into a cylindrical hole of a nozzle holder to which a fluid supply pipe is connected to a side surface of a forward end. Let me hold
Usually, a cylindrical gas nozzle surrounding the contact tip is detachably attached to the tip of the nozzle holder, and this is the invention according to claim 2. Further, in the present invention, in order to improve the flow of the fluid for blowing off the sputter, the fluid supply pipe is connected to the forward end of the cylindrical hole portion of the fluid nozzle holder with the forward enlarged portion having substantially the same diameter as the inner diameter of the gas nozzle. It is preferable to continue the tapered cylindrical portion having a divergent shape, and this is defined as the invention according to claim 3, and further,
In each of the above-described inventions, the gas nozzle formed of a ceramic material or a carbon material is defined as the invention according to claim 4. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 31, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

In order to solve the above-mentioned problems, an automatic spatter removing nozzle for arc welding according to the present invention has a contact tip (1) having a cylindrical gas nozzle.
In the nozzle for automatically removing spatter for arc welding surrounded by (3), the tip where the contact tip is attached to the tip is
Insert the holder into the cylinder hole of the nozzle holder,
The tip of the nozzle holder has a cylindrical shape surrounding the contact tip.
The gas nozzle is detachably mounted, and the base of this gas nozzle
Air for blowing off the spatter from the side to the tip opening
And a fluid supply pipe for feeding the fluid.
Inert gas is output to the tip holder where the tact tip is mounted.
A mouth is formed . Further, in the present invention, in order to improve the flow of the fluid for blowing off the sputter, the fluid supply pipe is connected to the forward end of the cylindrical hole portion of the fluid nozzle holder with the forward enlarged portion having substantially the same diameter as the inner diameter of the gas nozzle. It is preferable that the tapered cylindrical portion of the divergent shape be continued. This is the invention according to claim 2 , and in each of the above-mentioned inventions, the gas nozzle is formed of a ceramic material or a carbon material. Claim
The present invention relates to the third aspect .

Claims (4)

[Claims] In an automatic spatter removal nozzle for arc welding in which a contact tip (1) is surrounded by a cylindrical gas nozzle (3), air or the like for blowing off spatter from a base side of the gas nozzle (3) toward a tip end opening is provided. An automatic spatter removal nozzle for arc welding, wherein a fluid supply pipe (6) for sending a fluid is connected. 2. A tip holder (2) to which a contact tip (1) is attached at a tip is inserted and held in a cylindrical hole of a nozzle holder (4) to which a fluid supply pipe (6) is connected to a side surface of a tip. ,
An automatic spatter removing nozzle for arc welding, wherein a cylindrical gas nozzle (3) surrounding a contact tip (1) is detachably attached to the tip of the nozzle holder (4). The forward end of the cylindrical hole of the nozzle holder (4) has a forward enlarged portion (4a) having substantially the same diameter as the inner diameter of the gas nozzle (3).
And a tapered cylindrical portion with a flared shape to which the fluid supply pipe (6) is connected.
3. The spatter automatic removal nozzle for arc welding according to claim 2, wherein the nozzle comprises (4b). 4. The automatic spatter removing nozzle for arc welding according to claim 1, wherein the gas nozzle is formed of a ceramic material or a carbon material.