JPH10263825A - Nozzle for welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adhesion of sputters at the time of welding to an inside surface and to prevent the degradation in the channelling and stagnating of a shielding gas and the degradation in the effect of shielding to welding sections by forming a shielding gas injection nozzle body of heat resistant fibers to a cylindrical shape and coating the inner peripheral surface thereof with a heat resistant resin. SOLUTION: The nozzle body 7 is formed of the fibers, such as glass fibers, having heat resistance to the cylindrical shape and its inner peripheral surface or inner and outer peripheral surfaces are coated with the heat resistant resin, such as silicone, by a suitable method, such as vapor deposition. The nozzle body 7 is directly inserted in the state of cutting the cylindrical fiber body into an insulating joint 4 and is fixed by means of a band 8 to the front end of a welding torch and, therefore, not only the adhesion of the sputters is prevented but the front end of the torch is made lighter in weight and the operator's burden is lessened. The black heat resistant resin is used for coating the nozzle 7, by which the reflection of welding arc light in the nozzle body 7 is prevented and the welding work is made much easier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch nozzle for an arc welding machine.

[0002]

2. Description of the Related Art A welding torch of an arc welding machine includes a nozzle for injecting a shielding gas such as a carbon dioxide gas, and a tip installed inside the nozzle. The tip has a hole for guiding a wire automatically supplied from the wire supply device to a welding site, and the welding wire receives electric power for arc generation when passing through the hole of the tip.

[0003] In this welding torch, an arc is generated between the tip of a welding wire and an object to be welded, and the heat of the arc causes the welding surface of the wire and the object to be welded to melt. To be welded in a shield gas atmosphere.

[0004] In arc welding using such a welding torch, it is inevitable that fine metal particles (spatter) melted during welding are scattered and adhere to the inner surface of the nozzle. The remarkable spatter adhesion on the inner surface of the nozzle causes the drift and stagnation of the shielding gas, reduces the shielding effect between the atmosphere and the welded part, and generates bubbles (blow holes) in the welded part.
And welding defects such as minute holes (pinholes).

[0005] Further, if the sputters accumulate and the nozzle and the chip are electrically connected by the spatter, a short circuit (spark) occurs when the nozzle comes into contact with the workpiece, and the torch may be damaged. Therefore, it is necessary to remove spatters attached to the inner surface of the nozzle as soon as possible.

[0006]

However, since the nozzle of the conventional welding torch has a cylindrical shape, when removing the spatter adhered to the inner surface thereof, for example, a sharp pointed tip such as a screwdriver is attached to the tip of the nozzle. There is no alternative but to insert the spatter from the opening to scrape off the spatter, or to wrap a paper file around the rod member and insert it into the nozzle to scrape off the spatter. .

[0007] The present invention has been made in view of such problems of the conventional technology, and has as its object to provide a welding torch nozzle capable of preventing spatter from adhering to the inner surface.

[0008]

SUMMARY OF THE INVENTION The present invention is a nozzle for a welding torch, and is configured as follows to solve the above-mentioned technical problem. That is, in the present invention, in a nozzle for injecting a shielding gas used in a welding torch of an arc welding machine, a nozzle body is formed in a cylindrical shape with heat-resistant fiber, and at least an inner peripheral surface of the fiber has heat resistance. It is characterized by being coated with a resin.

In this welding torch nozzle, since at least the inner peripheral surface of the nozzle body is coated with a heat-resistant resin, it is possible to prevent spatter from adhering. Also,
Since the nozzle body is formed of a heat-resistant fiber in a cylindrical shape, it is lightweight and deformable.

[0010] The fiber may be glass fiber and the resin may be silicon. In this case, processing of glass fiber and coating of silicon become easy. One end of the nozzle body can be directly fitted and attached to the attachment portion of the welding torch. In this case, the nozzle body can be easily attached.

[0011] A mounting bracket may be provided at an end of the nozzle body. In this case, the nozzle body can be securely attached. A nozzle can be provided at the tip of the nozzle body. In this case, the tip of the nozzle body can be prevented from being crushed, and the tip can be deformed and held as it is.

A net-like guide may be provided inside or outside the nozzle body. In this case, the nozzle body can be held in a bent state by bending the guide.

[0013] A cylindrical guide may be provided outside the nozzle body, and the guide may be provided with an attaching means.
In this case, the rigidity of the nozzle body can be increased.
The nozzle body can be inserted only into a range at the tip of the cylindrical guide where spatter tends to adhere. In this case, the length of the nozzle body can be reduced.

The coated heat-resistant resin can be made black. In this case, it is possible to prevent the light of the welding arc from being reflected by the nozzle body.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a welding arch nozzle according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of a welding torch 1 to which a nozzle for a welding torch according to the present invention is applied. The welding torch 1 is used for an arc welding machine using a carbon dioxide gas or a mixed gas as a shielding gas, and includes a torch body 3 connected to a tip of a torch holder 2, an insulating joint 4,
An orifice 5, a tip 6, a nozzle body 7, and a band 8 for fixing the nozzle body 7 are provided.

The insulating joint 4 insulates between the torch body 3 and the nozzle body 7. The orifice 5 straightens the shield gas supplied through the torch body 3 and supplies the same to the nozzle 7. The chip 6 is made of a magnesium alloy (MD1D,
MD2B), for example, by die casting. At the tip of the tip 6, a tubular power supply section (not shown) made of a tungsten alloy is inserted. The exposed surface of the chip 6 can be prevented from being sputtered by applying a fluororesin coating or Nimflon plating.

As shown in FIG. 2, the nozzle body 7 is formed of a heat-resistant fiber 7a, such as glass fiber, in a tubular shape, and at least the inner peripheral surface of the fiber 7a, in this embodiment, the inner and outer peripheral surfaces. A resin 7b having heat resistance such as silicon is coated by an appropriate method such as coating or vapor deposition. By making the resin 7b black, it is possible to prevent the light of the welding arc from being reflected by the nozzle body 7, and the welding operation is facilitated.

The nozzle body 7 is used in a state where the tubular fiber 7a is cut. That is, the nozzle body 7
Is directly fitted into the insulating joint 4 and is fixed by being tightened with a band 8 from above the nozzle body 7. The tip of the nozzle body 7 is used while being cut.

The shield gas supplied into the nozzle body 7 is jetted from the tip of the nozzle body 7 to a welding site.
The welded part of the workpiece melted by the heat of the arc generated between the tip of the welding wire and the welded part of the workpiece is shielded from the atmosphere.

As shown in FIG. 1, the welding wire (not shown) supplied from the wire supply device is inserted into the through hole 6a of the tip 6 through the torch body 3, and then passes through the nozzle body 7 to form the nozzle. It is automatically supplied to the welding part in front of the main body 7. Then, the welding wire is inserted into the through hole 6a of the tip 6.
, Electric power for arc generation is supplied from the tip 6 to the welding wire.

As described above, since the nozzle body 7 of the welding torch 1 is formed in a tubular shape with the heat-resistant fiber 7a, the tip portion can be made extremely lightweight, so that the burden on the operator is increased. Can be lightened. In addition, since the nozzle body 7 is freely deformable, the nozzle body 7 can be easily inserted and welded even when the welded portion is narrow, for example.

Further, since the surface of the nozzle body 7 is coated with a resin 7b having heat resistance, it is possible to almost completely prevent the spatter from adhering. Therefore, the conventional spatter removing operation is not required. In addition, it does not cause drift or stagnation of the shielding gas, so it is possible to sufficiently achieve the shielding effect between the atmosphere and the welding part, preventing the occurrence of welding defects such as bubbles and minute holes in the welding part. As a result, the welding quality can be improved.
Further, the life of the nozzle body 7 can be prolonged, and the frequency of replacement is reduced, which is economical.

FIG. 3 shows a nozzle 10 according to a second embodiment. The nozzle 10 has a mounting member 12 fixed to one end of a nozzle body 11 and a base 13 fixed to the other end. The nozzle body 11 is formed of a fiber having heat resistance in a cylindrical shape similarly to the nozzle body 7 described above, and the inner and outer peripheral surfaces thereof are coated with a resin having heat resistance. The mounting bracket 12 is provided with a screw hole 12a that is screwed into a mounting screw of the insulating joint 4 (FIG. 1).

The base 13 has a circular shape as shown in FIG. 4A, an oval shape as shown in FIG. 4B, or a circular shape as shown in FIG.
Since various shapes such as a deformed circular shape of the upper constriction shown in FIG. 1 can be used, welding work can be performed according to the condition of the welded portion. Note that only one of the mounting bracket 12 and the base 13 can be used.

FIG. 5 shows a nozzle 15 according to a third embodiment. As shown in FIG. 1A, the nozzle 15 has a rectangular mesh-shaped guide 17 fitted outside the nozzle body 16. Further, as shown in FIG. 3B, a mesh-shaped guide 18 of a diamond-shaped square can be fitted to the outside of the nozzle body 16. The nozzle body 16 is the same as the nozzle body 7 described above.

The nozzle 15 has mesh guides 17 and 18.
By bending the nozzle body, the nozzle body 16 can be held in a state of being bent into an arbitrary shape according to the situation of the welded portion. Therefore, welding according to the condition of the welded portion can be performed. Further, in the case of using the net-shaped guide 18 of the diamond-shaped cells, the diameter can be changed to some extent, so that the mounting becomes easy. Note that the mesh guides 17 and 18 can also be inserted inside the nozzle body 16. Further, these net-shaped guides 17 and 18 can be applied to the above-described nozzle 10 (FIG. 3).

FIG. 6 shows a nozzle 20 according to a fourth embodiment. The nozzle 20 has a cylindrical guide 22 fitted on the outside of the nozzle body 21 as shown in FIG. 1A, and a screw hole 23 for attachment is provided at an end of the guide 22. I have. This nozzle 20 can almost completely prevent the spatter from adhering.

In addition, as shown in FIG. 3B, the nozzle body 24 can be inserted into the nozzle 20 only in a range at the tip of the guide 22 where spatter is likely to adhere. In this case, the cost of the nozzle body 24 can be reduced. Furthermore,
The nozzle 20 is formed by adding a nozzle body 2 to a conventional cylindrical nozzle.
It can also be manufactured by inserting 1, 24,
This makes it possible to easily prevent spatter from adhering to the conventional nozzle.

[0030]

As described above, according to the welding torch nozzle of the present invention, since at least the inner peripheral surface of the nozzle body is coated with a heat-resistant resin, it is possible to reliably prevent spatter from adhering. it can. Therefore, the conventional spatter removing operation is not required, and the welding quality can be improved. In addition, since the nozzle body is formed of a heat-resistant fiber in a cylindrical shape, it is lightweight and freely deformable, so that a welding operation according to the condition of the welded portion can be performed.

When the fiber is glass fiber and the resin is silicon, the processing of the glass fiber and the coating of silicon become easy, so that the production of the nozzle becomes easy. If one end of the nozzle body is directly fitted into the mounting part of the welding torch and installed, the installation of the nozzle body becomes easy,
The assembly man-hour can be reduced. .

When the mounting member is provided at the end of the nozzle main body, the nozzle main body can be securely mounted and there is no possibility that the nozzle main body will come off. When a nozzle is provided at the tip of the nozzle body, the tip of the nozzle body can be prevented from being crushed, and the shape of the tip can be deformed and held as it is, so that it is easy to cope with the situation of the welded portion.

When a net-like guide is provided inside or outside the nozzle body, the guide can be bent to hold the nozzle body in an arbitrary shape, so that the welding operation according to the situation of the welded portion can be performed. Becomes possible.

A cylindrical guide is provided outside the nozzle body,
When the guide is provided with the attaching means, the rigidity of the nozzle main body can be increased, so that the nozzle main body can be prevented from being bent or crushed.

When the nozzle body is inserted only into a range where the spatter at the tip of the cylindrical guide is likely to adhere, the length of the nozzle body can be shortened, so that the cost can be reduced. When the coated heat-resistant resin is black, the reflection of the light of the welding arc can be prevented, so that the welding operation is facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a welding torch using a welding torch nozzle according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a welding torch nozzle according to a first embodiment of the present invention.

FIG. 3 is a perspective view showing a welding torch nozzle according to a second embodiment of the present invention.

FIG. 4 is a view taken in the direction of arrow A in FIG. 3;

FIG. 5 is a perspective view showing a welding torch nozzle according to a third embodiment of the present invention.

FIG. 6 is a view showing a nozzle for a welding torch according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 welding torch 7, 11, 16, 21, 24 nozzle body 7a glass fiber (heat-resistant fiber) 7b silicon (heat-resistant resin) 10, 15, 20 nozzle 12 mounting bracket 13 base 17, 18 mesh guide 22 cylindrical guide 23 screw hole (attachment means)

Claims (9)

[Claims] 1. A nozzle used for a welding torch of an arc welding machine for injecting a shielding gas, wherein a nozzle body is formed of a heat-resistant fiber in a cylindrical shape, and at least an inner peripheral surface of the fiber has heat resistance. A welding torch nozzle characterized by being coated with resin. 2. The welding torch nozzle according to claim 1, wherein the fibers are glass fibers, and the resin is silicon. 3. The nozzle for a welding torch according to claim 1, wherein one end of the nozzle body is directly fitted and attached to a mounting portion of the welding torch. 4. The welding torch nozzle according to claim 1, wherein a mounting bracket is provided at an end of the nozzle body. 5. The welding torch nozzle according to claim 1, wherein a nozzle is provided at a tip of the nozzle body. 6. The welding torch nozzle according to claim 1, wherein a mesh-shaped guide is provided inside or outside the nozzle body. 7. The welding torch nozzle according to claim 1, wherein a cylindrical guide is provided outside the nozzle body, and a mounting means is provided on the guide. 8. The nozzle for a welding torch according to claim 7, wherein the nozzle body is inserted only in a range where spatter at the tip of the cylindrical guide is likely to adhere. 9. The welding torch nozzle according to claim 1, wherein the coated heat-resistant resin is black.