JP3455766B2 - Shield gas nozzle - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a shield gas nozzle used for arc welding.

[0001]

2. Description of the Related Art A shield gas nozzle is used in arc welding, and the conventional shield gas nozzle is formed, for example, as shown in FIG.

That is, a conventional shield gas nozzle is one in which a contact tip 2 is disposed on the shaft core of a nozzle body 1 formed in a tubular shape, and a wire W is projected from the tip of the contact tip 2. The shield gas is ejected from the orifice 2a on the base end side of the contact tip 2 which is the upper end side in the figure.

Therefore, the wire W and the base materials A and B are made to be close to the welded portions of the base materials A and B which are butted to each other.
By generating an arc between and, the wire W is melted to form the weld pool C and the welding of the base materials A and B is realized.

When an arc is generated, a shield gas is jetted from the orifice 2a of the contact tip 2 so that the welding pool C is not mixed with oxygen from the surroundings.

[0005]

When the above arc occurs, a large amount of spatter S, which is a welding slag, is generated, but a part of the spatter S is attached to the nozzle body 1.

Incidentally, the nozzle body 1 is formed by using copper as a base material, and conventionally, it is considered that the surface of the nozzle body 1 is plated 3 to reduce the adhesion of the spatter S.

However, since the spatter S is generated from the molten wire W when an arc is generated and is, so to speak, a molten metal, it is attached from the mouth end 1a of the nozzle body 1 to its inner peripheral surface 1b. easy.

Then, even if the amount of spatter S that is temporarily adhered is very small, as shown in the figure, the mouth end 1a of the nozzle body 1 is blocked over a long period of time.
As a result, the subsequent ejection of the shield gas becomes incomplete, and oxygen easily mixes in the welding pool C, which may lead to poor welding.

Therefore, the spatter S attached to the nozzle body 1 is regularly removed, but in the present situation, the spatter S can be removed manually by using a proper tool such as a wire brush or a file. Is running.

However, since the spatter S adheres to the mouth end 1a and the inner peripheral surface 1b of the nozzle body 1 in a molten state, there is an inconvenience that it takes time to remove it.

Further, when the mouth end 1a and the inner peripheral surface 1b of the nozzle body 1 are scratched by removing the spatter S, the spatter S adheres quickly when it is reused. There is inconvenience.

Particularly, when the mouth end 1a of the nozzle body 1 is damaged, the mouth end 1a is easily melted thereafter, and the life of the nozzle body 1, that is, the shield gas nozzle is shortened. There is a problem that becomes.

The present invention was originally devised in view of the above-mentioned circumstances, and the purpose thereof is not only to realize perfect welding but also to sputter directly on the inner peripheral surface of the nozzle body. It is an object of the present invention to provide a shield gas nozzle that is optimal for preventing spatter from adhering and facilitating removal of spatter adhering to the inner peripheral side of the nozzle body, etc., and prolonging its life.

[0014]

In order to achieve the above-mentioned object, the structure of the present invention has a structure in which a contact tip is arranged in the axial center portion of a nozzle body formed in a cylindrical shape, and In a shield gas nozzle that is formed by projecting a wire from the tip and ejecting a shield gas from the orifice on the base end side of the contact tip, the nozzle body has a step, and the temperature at which the sputter release material exceeds the melting temperature of the metal. It is made of a material with high heat resistance and high hardness, and is composed of a tubular body and a bent part that is bent at a right angle with one end of the body facing outward.
The tubular body is press-fitted into the inner circumference of the nozzle body while the bent portion is brought into contact with the step portion, and the step portion becomes a horizontal plane.
It is composed of a vertical surface, and the length of the horizontal surface is the length of the bent portion.
And is provided at the inner peripheral end of the nozzle body so that the length of the vertical surface is the same as the wall thickness of the bent portion. Then, more specifically, it is assumed that the sputter release material is made of graphite as a base material and the cylindrical main body is press-fitted on the inner peripheral side of the nozzle main body.

[0015]

Therefore, the inner peripheral surface of the nozzle body is protected by the spatter peeling material which is another member, and the spatter which is the welding slag when the arc is generated adheres to the spatter peeling material and the inner circumference of the nozzle body It will not adhere to the surface.

Since the sputter release material is formed by using graphite as a base material, it becomes difficult for the spatter to be attached to the sputter release material, and even if the spatter is attached to the sputter release material, the spatter of the spatter is removed. It can be easily removed.

Further, the sputter release material has a cylindrical body and a bent portion whose one end is bent outward at a right angle, and is deteriorated by being press-fitted into the inner circumference of the nozzle body. New spatter by removing spatter release material
The so-called exchange of press-fitting the release material becomes possible.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. As shown in FIG. 1, a shield gas nozzle according to an embodiment of the present invention is basically the same as the above-mentioned conventional one. Similar to the shield gas nozzle, the contact tip 2 is provided in the axial center of the nozzle body 1 formed of a copper material in a tubular shape, and the wire W is projected from the tip of the contact tip 2 to form the base of the contact tip 2. It is formed so that the shield gas is ejected from the orifice 2a on the end side.

Of the surfaces of the nozzle body 1, the outer peripheral surface 1
Only c is plated 3 times.

It is assumed that the nozzle body 1 is provided with the sputter release material 10 from the mouth end 1a to the inner peripheral surface thereof. The sputter release material 10 is a metal, for example, the base materials A and B to be welded. (See FIG. 3) and wire W (see FIG. 3)
It is said that it is formed of a material having heat resistance at a temperature higher than the melting temperature and having high hardness.

In the illustrated example, the sputter separation material 10 is made of graphite as a base material, and the sputter separation material 10 is press-fitted into the inner peripheral side of the nozzle body 1.

The sputter release material 10 has a cylindrical body 10b and a bent portion 10a whose one end is bent outward at a right angle.

As a result, the nozzle body 1 is covered with the sputter peeling material 10, which is another member, from the mouth end 1a to the inner peripheral surface 1b, and the spatter S, which is a welding slag when an arc occurs (see FIG. 3). Will not be attached.

Further, even if the spatter S is attached to the sputter release material 10, the sputter release material 1
Since 0 has heat resistance at a temperature exceeding the melting temperature of the metal and has high hardness with graphite as the base material, the spatter S can be easily removed.

The bent portion 10a of the sputter release material 10 is formed on the mouth end 1a of the nozzle body 1 as follows.

That is, in the embodiment shown in FIGS. 1 and 2, the bent portion 10a of the sputter peeling material 10 is located inside the mouth end 1a of the nozzle body 1 on the inner peripheral side of the mouth end 1a of the nozzle body 1. It is assumed that the positioning is performed by the step portion 1b provided on the circumference.

In this case, even if the outer peripheral side of the mouth end 1a of the nozzle body 1 comes into contact with another portion, the bent portion 10a of the sputter peeling material 10 is not brought into contact with the other portion, and the spattering is prevented. The bent portion 10a of the release material 10 can be protected.

In this case, the stepped portion 1b may have a horizontal surface and a vertical surface.
The length of the horizontal plane is the same as the length of the bent part
The vertical surface is provided at the inner peripheral end of the nozzle body 1 so that the axial length thereof is the same as the wall thickness of the bent portion 10a.

According to this embodiment, the bent portion 10a of the sputter release material 10 can be further protected.

In the shield gas nozzle formed as described above, the inner peripheral surface 1a of the nozzle body 1 is protected by the sputter peeling material 10 which is another member, and the spatter which is a welding slag when an arc occurs. S is attached to the sputter release material 10 and is not attached to the inner peripheral surface 1a of the nozzle body 1.

Since the sputter peeling material 10 is formed by using graphite or silicon carbide as a base material, the spatter S is sputter peeled as shown in the comparison of the effects shown in Table 2 under the welding conditions shown in Table 1 below. It is difficult for the spatter S to be attached to the material 10, and the spatter S is temporarily removed.
The spatter S can be easily removed even if the spatter S is attached to.

[0032]

[Table 1]

[Table 2] Further, the sputter peeling material has a cylindrical main body and a bent portion whose one end is bent outward at a right angle, and is sprinkled into the inner circumference of the nozzle main body. It is possible to replace by removing the spatter and pressing in a new sputter release material.

[0033]

As described above, according to the inventions of the respective claims , of course, complete welding can be realized, and in the shield gas nozzle, spatter is prevented from directly adhering to the inner peripheral surface of the nozzle body. At the same time, there is an advantage that the spatter adhered to the inner peripheral side of the nozzle body can be easily removed and the life of the spatter is optimized.

Further, since the sputter release material has a cylindrical main body and a bent portion whose one end is bent outward at a right angle, and is press-fitted into the inner circumference of the nozzle main body, It is possible to replace the deteriorated sputter release material by removing it and press-fitting a new sputter release material.

[Brief description of drawings]

FIG. 1 is a partial front view showing a partially cutaway shield gas nozzle according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a mouth end of a nozzle body.

FIG. 3 is a partial front view showing a state in which a conventional shield gas nozzle is partially broken and a base material is welded.

[Explanation of symbols]

1 nozzle body 1a mouth end 1b step 2 contact tips 2a Orifice 10 Sputter release material 10a bent part 10b body W wire

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsumi Kuwahara 2548 Tsuchida, Kani City, Gifu Prefecture Kayaba Industry Co., Ltd. Gifu North Factory (72) Inventor Nanjo Tenshumaru 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. (56) Reference JP 62-38773 (JP, A) JP 61-46375 (JP, A) JP 47-14037 (JP, A) JP 64-64 83379 (JP, A) Actually opened 63-62282 (JP, U) Actually opened 58-76388 (JP, U) Actually opened 61-82780 (JP, U) Actually opened 62-193973 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23K 9/29 C23C 14/34

Claims (2)

(57) [Claims] 1. A contact tip is provided on the shaft core of a cylindrical nozzle body, a wire is projected from the tip of the contact tip, and a shield gas is ejected from an orifice on the base end side of the contact tip. In the shield gas nozzle formed as described above, the nozzle body has a step portion, and the sputter release material is formed of a material having high heat resistance and high hardness that exceeds the melting temperature of the metal, and has a cylindrical shape. a body, formed of one end of the outwardly perpendicularly folded bent portion toward the body, while the bent portion is brought into contact with the stepped portion, is pressed into the tubular body to the inner circumference of the nozzle body, the stepped From the horizontal and vertical planes
And the length of the horizontal plane is the same as the length of the bent part,
A shield gas nozzle provided on the inner circumference of the end of the nozzle body so that the length of the vertical surface is the same as the wall thickness of the bent portion. 2. The shield gas nozzle according to claim 1, wherein the sputter release material is made of graphite as a base material, and the cylindrical main body is press-fitted into the inner peripheral side of the nozzle main body.