JPH10109175A - Stock for gas shield arc welding nozzle and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stock for a gas shield arc welding nozzle capable of easily manufacturing the nozzle made from dispersion-strengthened copper (ODS). SOLUTION: The base stock 21 for the nozzle is provided with the core material 23 formed into a pipe shape from copper or brass, an ODS part 5 formed into a cylindrical shape around the core material 23 and a sheath 7 formed around the ODS part 5. The nozzle 51 is obtained by cutting the stock 21 for the nozzle up to the position shown with broken lines 9, 11. Since the ODS part 5 contains, by wt., 0.05-1.7% alumina, it is formed by hot extruding and provided with excellent wear resistance and spatter deposition resistance or the like. Also, the outer diameter of the base stock 23 is >=50% to <100% to the inner diameter of the nozzle 51, and moreover the inner diameter is 70-98% to the outer diameter. Therefore, the center is easily hollowed out with a drill or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shield arc welding nozzle material for manufacturing a nozzle used for a gas shield arc welding torch and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a gas-shielded arc welding torch as shown in FIG. 3 has been known. That is, the torch shown in FIG.
A tip body 55 having an upper end screwed into the tip of the tip body 55, a contact tip 54 fitted to the lower end of the tip body 55, and an insulating cover attached to an outer surface of the tip body 55 by screwing a large diameter portion. 53 and insulating cover 5
Orifice 5 screwed to the outer surface of the small diameter portion 3
2 and a nozzle 51 concentrically attached to the contact tip 54 by screwing the upper end to the outer surface of the large diameter portion of the insulating cover 53.
And

In the thus constructed torch, current is supplied from the torch body 56 to the contact chip 54 via the tip body 55 by an electrode wire (not shown), and the torch body 56 supplies the current to the contact chip 54 via the tip body 55 and the orifice 52. A shielding gas is supplied. Then, arc welding can be performed by the current supplied to the contact tip 54.

However, this type of gas shielded arc welding torch is always exposed to a high-temperature atmosphere during welding, and high-temperature spatter scattered by welding adheres to the inner surface of the nozzle 51 and the outer surface of the contact tip 54. Conventionally, pure copper or chromium copper is used for these members, and when sputter adheres, the sputter alloys and is welded to the nozzle 51 and the like. When the welding becomes severe, the normal flow of the shielding gas is hindered, and there is a possibility that poor welding may occur. Therefore, each time the spatter is welded, the torch is disassembled,
Each part has been polished to remove spatter. However, frequent repetition of spatter removal causes deformation and premature wear of parts, and shortens the life of the torch.

Therefore, as described in, for example, Japanese Patent Publication No. 3-71943, it has been considered that ceramics are lined on the inner and outer surfaces of the nozzle 51 to suppress welding of spatter. However, according to this technique, not only is production of the torch troublesome and costly, but also there is a possibility that the lined ceramics may be broken during spatter removal. Further, as described in Japanese Patent Publication No. 3-48773, it is considered that the nozzle 51 is made of carbon. However, in this case, the nozzle 51 is easily broken and expensive, and spatter is generated during welding. There is a possibility of falling into the part. If the spatter falls, problems such as corrosion of the vicinity of the weld occur.

[0006]

Therefore, it is conceivable to manufacture the nozzle 51 from dispersion strengthened copper. Dispersion-strengthened copper does not soften even when exposed to high temperatures, and has poor wettability to sputtering. Therefore, when used as a nozzle 51 of a gas shielded arc welding torch, spatter is less likely to be deposited and hinder the flow of gas, and even if spatter adheres, it can be easily removed. Also,
The dispersion-strengthened copper is appropriately blended with the spatter, so that the spatter does not fall during welding, and can be dropped only during polishing. Further, since the dispersion strengthened copper is excellent in heat resistance and abrasion resistance, it is hardly deformed even by removing spatter, and the life of the nozzle 51 becomes very long. Further, since the heat resistance is excellent, the thickness of the nozzle 51 can be reduced.

However, dispersion-strengthened copper is conventionally produced from a powder material by hot extrusion or the like in order to uniformly disperse the ceramic particles and make internal oxidation uniform. For this reason, the dispersion strengthened copper is supplied in the form of a bar, and in order to manufacture the nozzle 51, it was necessary to cut out the center of the bar and cut it out. Since the dispersion strengthened copper is strong, this cutting operation requires a great deal of labor and cost.

Accordingly, an object of the present invention is to provide a material for a gas shielded arc welding nozzle from which a dispersion strengthened copper nozzle can be easily manufactured.

[0009]

Means for Solving the Problems and Effects of the Invention The invention according to claim 1, which has been made to achieve the above object, is a material for manufacturing a nozzle used in a torch for gas shielded arc welding, comprising copper. Or a pillar-shaped or pipe-shaped core material made of brass and having an outer diameter of 50% or more and less than 100% with respect to the inner diameter of the nozzle, and 0.05 to 1.7.
A dispersion-strengthened copper portion formed around the core material and having an outer diameter equal to or larger than the outer diameter of the nozzle by alumina-dispersion-strengthened copper containing alumina by weight and the balance consisting of copper and unavoidable impurities; A material for a gas shielded arc welding nozzle characterized by comprising:

In the present invention having the above-described structure, the center of the dispersion-strengthened copper portion is 50% or more with respect to the inner diameter of the nozzle.
It has a copper or brass core material having an outer diameter of less than 0%. Then, by hollowing out this core material together with the surrounding dispersion strengthened copper, the hollow portion of the nozzle can be formed. Further, the dispersion strengthened copper portion has an outer diameter equal to or larger than the outer diameter of the nozzle, and the outer periphery of the nozzle can be formed by cutting the outer periphery as necessary.

Here, copper and brass are extremely excellent in workability as compared with dispersion strengthened copper. For this reason, the work of cutting and hollowing out the center of the material becomes extremely easy.
If the outer diameter of the core material is less than 50% of the inner diameter of the nozzle, the effect of improving machinability is small, and a large amount of expensive dispersion strengthened copper is wasted. Also, the outer diameter of the core material is equal to or larger than the inner diameter of the nozzle (100% or more)
This leaves copper or brass on the inner surface of the finished nozzle. In this case, spatter similar to that of a conventional nozzle adheres to the copper or brass, causing problems such as a reduction in wear resistance and welding of spatter.

On the other hand, in the present invention, since the outer diameter of the core is 50% or more and less than 100% with respect to the inner diameter of the nozzle, it is possible to improve the machinability and reduce the material cost. And no copper or brass remains on the inner surface of the finished nozzle.

On the other hand, if the alumina content of the dispersion-strengthened copper constituting the dispersion-strengthened copper portion is less than 0.05% by weight, sufficient wear resistance, spatter welding resistance and heat resistance cannot be obtained. Further, this kind of material is manufactured by a processing method such as hot extrusion. However, if the alumina content exceeds 1.7% by weight, the workability is reduced, and it becomes difficult to manufacture the material itself. On the other hand, in the present invention, since the alumina content is 0.05 to 1.7% by weight, the production of the material itself is easy and the nozzle of the finished product has sufficient abrasion resistance and spatter resistance. Weldability is obtained.

Therefore, by using the material of the present invention, it is possible to easily produce a dispersion-hardened copper nozzle which is hardly deformed and has excellent wear resistance and spatter welding resistance. Claim 2
The described invention is characterized in that, in addition to the structure of the first aspect, the core is formed in a pipe shape having an inner diameter of 70 to 98% with respect to the outer diameter of the core.

As described above, in the present invention, since a pipe-shaped core material is used, the cutting operation for forming the hollow portion of the nozzle is further facilitated. If the inner diameter of the core material is less than 70% of its outer diameter, the effect of forming the core material into a pipe shape is not sufficiently exhibited, and the machinability is significantly improved as compared with the case where a columnar core material is used. Can not be seen. Further, the strength of the core material itself decreases as the inner diameter of the core material increases, but if the inner diameter exceeds 98% of the outer diameter, it becomes difficult to manufacture the core material by hot extrusion or the like.

In the present invention, the inner diameter of the core material is set to 70 to 9 of the outer diameter.
Since it is 8%, in addition to the effect of the invention described in claim 1, there is an effect that the manufacture of the nozzle can be further facilitated. The invention according to claim 3 is a method for producing the material for a gas shielded arc welding nozzle according to claim 1 or 2, wherein the dispersion-strengthened copper portion is made of copper or brass having an inner diameter larger than the outer diameter. Inside the container, a column or pipe made of copper or brass having an outer diameter smaller than the inner diameter of the container and larger than the outer diameter of the core material is disposed, and between the column or the pipe and the container. A method for producing a material for a gas shielded arc welding nozzle, characterized by filling a powdery alumina dispersion-strengthened copper into a billet and hot extruding the billet.

In the present invention thus constituted, the powdery alumina dispersion-strengthened copper is pressurized when the billet is hot-extruded to form the dispersion-strengthened copper portion. At this time, the brass column or pipe is reduced in diameter to become the core material. As a result, the material for a gas shielded arc welding nozzle according to claim 1 or 2 is obtained.

As described above, according to the present invention, the material for a gas shielded arc welding nozzle according to claim 1 or 2 can be easily manufactured by hot extrusion. Therefore, if the above-described material is manufactured according to the present invention, and then a nozzle is manufactured from the material, a dispersion-reinforced copper nozzle that is hardly deformed and has excellent wear resistance and spatter welding resistance can be manufactured very easily. .

[0019]

Next, an embodiment of the present invention will be described. FIG. 1A shows a material for a gas shielded arc welding nozzle to which the present invention is applied (hereinafter simply referred to as a material for a nozzle).
FIG. 2 is a cross-sectional view illustrating the configuration of FIG. As shown in FIG. 1 (A), a nozzle material 1 includes a core material 3 formed of copper or brass in a cylindrical shape, and a dispersion strengthened copper portion (hereinafter, referred to as a cylindrical shape) formed around the core material 3. ODS section) 5,
And an outer skin 7 formed around the ODS portion 5. The outer skin 7 is not essential to the nozzle material 1 but is formed by the following manufacturing process.

The manufacturing process of the nozzle material 1 is as follows. First, a copper or brass cylindrical body having an outer diameter smaller than the inner diameter of the copper or brass cylindrical container is provided inside the cylindrical container. Subsequently, a powder of alumina dispersion strengthened copper is filled between the column and the container to form a billet. The billet 1 is obtained by hot extruding the billet. The outer cover 7 is obtained by reducing the diameter of the container. In addition, the outer cover 7 has an effect of smoothing the billet through the die during the hot extrusion.

The thus-produced nozzle material 1 shown in FIG. 1A includes a core material 3 and an ODS portion 5 around the core material 3.
Is cut out to a position shown by a broken line 9 with a drill or the like, and a process of cutting the outer skin 7 and the ODS portion 5 inside thereof to a position shown by a broken line 11 with a cutting tool or the like.
By this processing, the nozzle 51 shown in FIG. 1B can be manufactured. The nozzle 51 thus manufactured is
It can be used as a part of a torch for gas shielded arc welding as illustrated in FIG.

Here, copper or brass is extremely excellent in workability as compared with dispersion strengthened copper. For this reason, the above operation of hollowing out the center of the nozzle material 1 with a drill or the like becomes extremely easy. Note that the outer diameter of the core material 3 is 50% or more and less than 100% with respect to the inner diameter of the nozzle 51 (the diameter of the broken line 9).

If the outer diameter of the core material 3 is less than 50% of the inner diameter of the nozzle 51, the effect of improving the machinability is small and a large amount of the expensive ODS portion 5 is wasted. Also, 1
If it is not less than 00%, copper or brass remains on the inner surface of the nozzle 51. In this case, spatter similar to that of a conventional nozzle adheres to the copper or brass, causing problems such as a reduction in wear resistance and welding of spatter. On the other hand, in the nozzle material 1, since the outer diameter of the core material 3 is set in the above range, the machinability can be improved satisfactorily and the material cost can be reduced. No copper or brass remains on the inner surface of the metal. In addition, as a material constituting the core material 3, of pure copper and brass, brass is more excellent in workability, and the machinability can be further improved.

The dispersion-strengthened copper constituting the ODS portion 5 is composed of alumina-dispersion-strengthened copper powder containing 0.05 to 1.7% by weight of alumina and the balance of copper and unavoidable impurities.
It was formed by pressurization by the above hot extrusion. If the alumina content of the alumina dispersion strengthened copper is less than 0.05% by weight, sufficient wear resistance, spatter welding resistance, and heat resistance cannot be obtained. On the other hand, when the alumina content exceeds 1.7% by weight, the workability in hot extrusion is reduced, and the production of the raw material itself becomes difficult. On the other hand, in the nozzle material 1, since the alumina content is set in the above range, the material itself can be easily manufactured, and the nozzle 51 of the finished product can be easily manufactured.
Sufficient abrasion resistance, spatter welding resistance, and heat resistance are obtained.

Therefore, if the nozzle material 1 is used, it is possible to easily manufacture the nozzle 51 made of dispersion-strengthened copper which is hardly deformed and has excellent wear resistance and spatter welding resistance. Next, FIG. 2A is a cross-sectional view illustrating a configuration of another nozzle material 21 to which the present invention is applied. This nozzle material 2
1 has the same configuration as the nozzle material 1 except that the core material 23 is formed in a pipe shape having a hollow portion 23a. In FIG. 2 (A), the same reference numerals as those used in FIG. 1 are used for portions configured similarly to the nozzle material 1, and detailed description of the configuration is omitted. Further, the manufacturing process of the nozzle material 21 includes a point that a pipe made of copper or brass is used instead of the cylindrical body used for manufacturing the nozzle material 1 and a male mandrel penetrating the pipe in hot extrusion. Is different in that

In this nozzle material 21 as well, the core material 23 and the ODS portion 5 around the core material 23 are cut out to the position shown by the broken line 9, and the outer skin 7 and the ODS portion 5 inside the same are cut out by the broken line 1.
1 and the nozzle 5 shown in FIG.
1 can be manufactured. Further, in the nozzle material 21, since the core material 23 is formed in a pipe shape, the cutting operation for hollowing out the center is further facilitated.

In the nozzle material 21, the inner diameter of the core material 23 is set to 70 to 98% of the outer diameter. Core material 23
If the inner diameter is less than 70% of the outer diameter, the effect of making the core material 23 into a pipe shape does not sufficiently appear, and no significant improvement in machinability is observed. Also, as the inner diameter of the core 23 increases, the strength of the core 23 itself decreases, but the inner diameter is
If it exceeds 8%, it becomes difficult to produce the core material 23 by hot extrusion. In the nozzle material 21, since the inner diameter of the core material 23 is set in the above range, the manufacture of the nozzle 51 can be extremely facilitated.

[0028]

Next, in order to verify the operation and effect of the present invention,
Various nozzle materials were actually manufactured as follows, and the nozzles 51 were manufactured from the nozzle materials. In addition,
As described below, all the finished nozzles 51 have the same standard.

Example 1 Cu- with a particle size of 149 μm or less
The 0.4 wt% Al alloy powder was kept in the atmosphere at 350 ° C. for 1 hour to oxidize the powder surface. This is heated and maintained in an Ar gas atmosphere at 850 ° C. for 3 hours to diffuse oxygen on the surface of the powder into the powder, oxidize Al in Cu to alumina, and further, in an atmosphere of hydrogen gas at 700 ° C. ×
Excessive oxygen on the surface of the powder was removed by heating for 1 hour.
The powder is cooled to a density of 80 by CIP (cold isostatic pressing).
%, And a container made of adjacent deoxidized copper (φ254 mm × φ2) in which a rod of φ150 mm made of brass (73 brass) is arranged at the center.
34mm x 500mmL) by TIG welding. This is hot-extruded as a billet to φ28mm and drawn by φ
A 22 mm rod (material 1 for nozzle) was used. The outer diameter of the core material 3 was 15 mm, and the amount of alumina in the ODS portion 5 was 0.7% by weight. Φ20mm × φ16mm × 73
The nozzle 51 of mmL was formed by lathing with a cutting tool on the outside and by a single drilling process on the inside with a drill.

Example 2 Cu- with a particle size of 74 μm or less
The 0.2 wt% Al alloy powder was oxidized in the air at 400 ° C. for 1 hour. This was heated and held in a nitrogen gas atmosphere at 900 ° C. for 3 hours, and further heated at 500 ° C. × 1 in a hydrogen gas atmosphere.
Heated and held for hours. This powder was placed in a brass container (φ254 mm × φ234 mm × 5) centered on a rod of φ115 mm made of brass.
(00 mmL) and the above rod, and sealed by TIG welding. This is hot extruded as a billet to φ60mm,
Φ22mm rod by rolling and drawing (Nozzle material 1)
And The outer diameter of the core material 3 is 12 mm, and the ODS portion 5
Was 0.3% by weight. Φ from this bar
A nozzle 51 of 20 mm × φ16 mm × 73 mmL was formed.

Example 3 Cu- with a particle size of 74 μm or less
The 0.7 wt% Al alloy powder was oxidized in the air at 400 ° C. for 1 hour. This was heated and held at 900 ° C. for 3 hours in a nitrogen gas atmosphere.
Heated and held for hours. This powder is made of brass φ115mm × φ
A 95 mm pipe was centered and filled between a brass (64 brass) container (φ254 mm × φ234 mm × 500 mmL) and the pipe and sealed by TIG welding. This was hot extruded into a billet of φ90 mm × φ13 mm, rolled and drawn to form a φ22 mm × φ9 mm tube (material 2 for nozzle).
1). The outer diameter of the core material 23 is 10.5 mm,
The amount of alumina in the ODS part 5 was 1.3% by weight. A nozzle 51 of φ20 mm × φ16 mm × 73 mmL was formed from this raw tube.

Example 4 Cu- with a particle size of 74 μm or less
The 0.4 wt% Al alloy powder was oxidized in the air at 400 ° C. for 1 hour. This was heated and held at 900 ° C. for 3 hours in a nitrogen gas atmosphere.
Heated and held for hours. This powder is made of brass φ115mm × φ
Oxygen-free copper container centered on a 95 mm pipe (φ254
(mm × φ234 mm × 500 mmL) and the above pipe, and sealed by TIG welding. This was hot-extruded into a billet of φ90 mm × φ13 mm, rolled and drawn to form a φ22 mm × φ9 mm tube (material 21 for nozzle).
The outer diameter of the core material 23 was 10.5 mm, and the amount of alumina in the ODS portion 5 was 0.7% by weight. Φ2 from this tube
A nozzle 51 of 0 mm × φ16 mm × 73 mmL was formed.

Example 5 Cu- with a particle size of 74 μm or less
The 0.4 wt% Al alloy powder was oxidized in the air at 400 ° C. for 1 hour. This was heated and held at 900 ° C. for 3 hours in a nitrogen gas atmosphere.
Heated and held for hours. This powder is made of brass φ115mm × φ
Brass container (φ254mm ×
(φ234 mm × 500 mmL) and the above pipe, and sealed by TIG welding. This as billet φ
Hot extruded to 90 mm x 30 mm, rolled and drawn to form a 22 mm x 5.0 mm tube (material 21 for nozzle). The outer diameter of the core material 23 was 8 mm, and the amount of alumina in the ODS portion 5 was 0.7% by weight. Φ20 from this tube
A nozzle 51 of mm × φ16 mm × 73 mmL was formed.

[Comparative Example 1] Cu- with a particle size of 149 μm or less
The 0.4 wt% Al alloy powder was oxidized in the air at 350 ° C. for 1 hour. This was heated and maintained at 850 ° C. × 3 hours in an Ar gas atmosphere, and further heated at 700 ° C. × 1 in a hydrogen gas atmosphere.
Heated and held for hours. This powder is subjected to a density ratio of 8 by CIP.
Solidified and molded to 0%, oxygen-free copper container (φ254mm × φ234mm × 500mm) centered on a rod of φ75mm made of brass
L) and the above-mentioned rod were filled and sealed by TIG welding. This was hot-extruded as a billet to φ28 mm and drawn into a φ22 mm rod by drawing. The outer diameter of this core is 7.5mm
And the amount of alumina in the ODS part was 0.7% by weight. A nozzle 51 of φ20 mm × φ16 mm × 73 mmL was formed from this rod.

Comparative Example 2 Cu- with a particle size of 149 μm or less
The 0.4 wt% Al alloy powder was oxidized in the air at 350 ° C. for 1 hour. This was heated and maintained at 850 ° C. × 3 hours in an Ar gas atmosphere, and further heated at 700 ° C. × 1 in a hydrogen gas atmosphere.
Heated and held for hours. This powder is subjected to a density ratio of 8 by CIP.
Solidified and molded to 0%, and next to a rod made of brass made of φ190 mm, a container made of adjacent deoxidized copper (φ254 mm × φ234 mm × 500
mmL) and the above rod, and sealed by TIG welding. This was hot-extruded as a billet to φ28 mm and drawn into a φ22 mm rod by drawing. The outer diameter of this core material is 16.2
mm, and the amount of alumina in the ODS part was 0.7% by weight. A nozzle 51 of φ20 mm × φ16 mm × 73 mmL was formed from this rod.

[Comparative Example 3] Cu-particles having a particle size of 74 μm or less
0.02 wt% Al alloy powder was oxidized in the air at 350 ° C. for 1 hour. This is placed in an Ar gas atmosphere at 850 ° C.
Heat and hold for 700 hours in a hydrogen gas atmosphere.
The heating was maintained for one hour. This powder is made of brass φ150mm
Filled between the rubber mold and the above-mentioned bar centering on the bar of
Solidified and molded to a density ratio of 77% with P, and a brass container (φ
(254 mm x 234 mm x 500 mm L) by TIG welding. This was hot-extruded as a billet to φ28 mm and drawn into a φ22 mm rod by drawing. The outer diameter of this core material was 10.5 mm, and the amount of alumina in the ODS portion was 0.04% by weight. Φ20mm × φ16mm × 73
An mmL nozzle 51 was formed.

COMPARATIVE EXAMPLE 4 Cu- with a particle size of 74 μm or less
The 1.0 wt% Al alloy powder was oxidized in the air at 400 ° C. for 1 hour. This was heated and maintained in an Ar gas atmosphere at 900 ° C. for 3 hours.
Heated and held for hours. This powder is subjected to a density ratio of 8 by CIP.
Solidified and molded to 0%, a container made of adjacent deoxidized copper (φ254 mm × φ234 mm × 500) centered on a rod of φ150 mm made of brass
mmL) by TIG welding. This was hot-extruded as a billet to φ28 mm, and the production was stopped because V-shaped cracks occurred frequently.

[Comparative Example 5] Conventionally, a core material was not provided at the center,
It is made by simply putting dispersion strengthened copper powder in a copper can. When cutting into a nozzle, a large amount of the central ODS must be removed by cutting, resulting in poor cutting efficiency and expensive OD.
Many S parts were wasted. This comparative example is a manufacturing method without a core material.

Cu-0.4% by weight having a particle size of 149 μm or less
The Al alloy powder was oxidized in air at 350 ° C. for 1 hour.
This was heated and maintained in an Ar gas atmosphere at 850 ° C. for 3 hours, and further heated and maintained in a hydrogen gas atmosphere at 700 ° C. for 1 hour. This powder was solidified and molded to a density ratio of 80% by CIP, and a container made of adjacent deoxidized copper (φ254 mm × φ234 mm ×
(500 mmL) and sealed by TIG welding. This is hot-extruded as a billet to φ28mm and drawn by φ
A 22 mm rod was used. The amount of alumina in this ODS part is 0.7
% By weight. Φ20mm × φ16mm × 7
A 3 mmL nozzle 51 was formed.

Table 1 shows the cutting time required for forming the nozzle 51 from the nozzle material manufactured by the methods of the above Examples and Comparative Examples, and the life of the formed nozzle 51. In addition, in Table 1, the cutting time and the nozzle life were represented by a ratio of Comparative Example 5 which is a conventional material as 1. Table 1 shows that the core members 3 and 23 with respect to the inner diameter of the nozzle 51 are shown.
The ratio of the outer diameter (X%) is also described, and the ratio of the inner diameter to the outer diameter (Y%) of the material using the pipe-shaped core material 23 is also described.

[0041]

[Table 1]

As shown in Table 1, in Comparative Example 1 in which X% was less than 50%, the cutting time was as long as 0.9, and the effect of improving the machinability was not sufficiently observed. In addition, expensive ODS
There is also a problem that a large amount of parts are wasted. X% is 10
In Comparative Example 2, which was 0% or more, the brass portion remained on the inner surface of the nozzle 51. For this reason, spatter adhered to the remaining brass portion in the nozzle 51 manufactured according to Comparative Example 2.
In Comparative Example 3 in which the alumina content of the ODS portion was less than 0.05% by weight, the nozzle life ratio was as short as 0.2, and sufficient wear resistance and spatter welding resistance could not be obtained. Comparative Example 4 in which the alumina content exceeds 1.7% by weight
In this case, cracks occurred during extrusion, making it difficult to manufacture the nozzle material itself.

On the other hand, in Examples 1 to 5, X% is 50% or more and less than 100%, so that the machinability can be improved satisfactorily and the material cost can be reduced. No copper or brass remained on the inner surface of No. 51. In addition, the alumina content is 0.05
Since the content is set to be from 1.7% by weight to 1.7% by weight, the material itself can be easily manufactured, and the abrasion resistance, the heat resistance, and the sputter welding resistance of the finished nozzle 51 are sufficient.

Further, when comparing Examples 3 to 5 using the pipe-shaped core material 23, in Example 5 in which Y% is less than 70%, the effect of making the core material 23 into a pipe shape appears sufficiently. And no significant improvement in machinability is observed. In addition, Y% is 9
If it exceeds 8%, it is expected that production by hot extrusion of the core material 23 will be difficult. In Examples 3 and 4, Y% is 7
0 to 98%, the cutting time is 0.3 and the nozzle 5
1 could be made very easy.

In the present invention, the core is made of copper or brass. For example, the core is made of a copper alloy, such as bronze, which is more workable than dispersion strengthened copper. It is expected that the same operation and effect as those of the present invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a nozzle material to which the present invention is applied.

FIG. 2 is a cross-sectional view illustrating a configuration of another nozzle material to which the present invention is applied.

FIG. 3 is a cross-sectional view illustrating the configuration of a torch for gas shielded arc welding.

[Explanation of symbols]

1,21 ... Material for gas shielded arc welding nozzle
3, 23 ... core material 5 ... dispersion strengthened copper part 7 ... outer skin 23a ... hollow part 51 ... nozzle

Claims (3)

[Claims] 1. A material for manufacturing a nozzle used for a gas-shielded arc welding torch, which is made of copper or brass and has a diameter of 50 to the inner diameter of the nozzle.
% Or less and less than 100% by weight, and a columnar or pipe-like core material, and an alumina dispersion strengthened copper containing 0.05 to 1.7% by weight of alumina and the balance of copper and inevitable impurities. And a dispersion strengthened copper portion formed as a center and having an outer diameter equal to or larger than the outer diameter of the nozzle. 2. The core according to claim 1, wherein said core has an outer diameter of 7 mm.
2. The material for a gas shielded arc welding nozzle according to claim 1, wherein the material is formed in a pipe shape having an inner diameter of 0 to 98%. 3. A method for manufacturing a material for a gas shielded arc welding nozzle according to claim 1, wherein the inside of a copper or brass container having an inner diameter larger than an outer diameter of the dispersion strengthened copper part. A column or pipe made of copper or brass having an outer diameter smaller than the inner diameter of the container and larger than the outer diameter of the core material, and a powdery material is provided between the column or the pipe and the container. A method for producing a material for a gas shielded arc welding nozzle, comprising: filling the above alumina dispersion strengthened copper into a billet; and extruding the billet hot.