JPH073868U - Welding torch - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents spatter from adhering to the contact tip and nozzle of the welding torch, and easily removes the accumulated spatter, shortening the preparation time during welding work and causing welding defects. Prevent. [Structure] Contact tip 2 of welding torch 1 and nozzle 6
The surface of the graphite-based graphite has good heat resistance and good lubricity.
It is coated with bon or ceramics to prevent the spatter from welding on the surfaces of the contact tip 2 and the nozzle 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding torch for gas shield arc welding, and more particularly to prevention of adhesion and accumulation of a spatter generated during welding.

[0002]

[Prior art]

 As shown in the sectional view of FIG. 5, the welding torch 1 has a hollow contact tip 2 made of a copper alloy and a contact tip 2 attached thereto, and has a plurality of orifices 3 at the outer periphery of the tip end thereof. It has a shield gas injection part 5 whose end is connected to the shield gas conduit 4, and a nozzle 6 made of copper alloy that covers the contact tip 2 and the shield gas injection part 5. Then, the shield gas 7 supplied from the shield gas injection part 5 is injected from the nozzle 6 to the joint part 8 to shield the arc 9 and the molten metal 10 from the air, while the welding wire 11 is connected to the contact tip 2 Weld inside by sliding at a constant speed and welding.

When this welding torch 1 is used, for example, when a welding operation is performed by a robot, an arc is generated for a long time, so that the amount of spatter attached to the nozzle 6 of the welding torch 1 increases. In particular, as shown in the perspective view of the welding operation state of FIG. 6, when performing the welding operation in the upward posture, the spatter 12 enters the inside of the nozzle 6 and the inner surface of the nozzle 6 made of copper alloy and the contact tip. 2 adheres to and accumulates on the surface of No. 2 and closes the orifice 3 of the shield gas injecting unit 5, causing welding defects. In order to prevent the occurrence of this welding defect, it is necessary to frequently remove the spatter 12 adhered and accumulated between the nozzle 6 and the contact tip 2.

In order to remove the spatter 12 accumulated between the nozzle 6 and the contact tip 2, for example, as shown in the perspective view of FIG. And the spatter 12 in the nozzle 6 is scraped off by the cutting blade 72 while rotating the cutting tool 71.

[0005]

[Problems to be solved by the device]

 As described above, since the contact tip 2 of the welding torch 1 and the nozzle 6 are each formed of a copper alloy, the spatter 12 that has entered between the contact tip 2 and the nozzle 6 easily adheres, and the adhesion and deposition It was not easy to remove the spatter 12 because the spatter 12 adhered firmly to the surfaces of the contact tip 2 and the nozzle 6. In addition, since spatters are frequently removed, it takes a lot of time to remove spatters, resulting in poor work efficiency of welding work.

The present invention has been made in order to improve such disadvantages, and it is possible to obtain a welding torch capable of preventing spatter from adhering to a contact chip or a nozzle and easily removing deposited spatter. The purpose is.

[0007]

[Means for Solving the Problems]

 The welding torch according to the present invention is characterized in that the surface of the contact tip and the inner surface of the nozzle or the inner and outer surfaces of the nozzle are coated with graphite-based carbon. The surface of the contact tip and the inner surface of the nozzle or the inner and outer surfaces of the nozzle may be coated with ceramics.

[0008]

[Action]

 In this invention, the contact tip of the welding torch and the surface of the nozzle are coated with graphite-based carbon and ceramics, which have good heat resistance and good lubricity, to prevent spatter from welding to the surface of the contact tip and nozzle. .

Further, even if spatter invades and accumulates between the contact tip and the nozzle, the deposited spatter is prevented from being deposited on the surfaces of the contact tip and the nozzle, and the welding torch is vibrated. The spatter deposited by is easily separated from the surface of the contact tip or nozzle.

[0010]

【Example】

 1 and 2 are sectional views showing a contact tip and a nozzle of a welding torch according to an embodiment of the present invention. As shown in FIG. 1, a protection tube 13 made of graphite-based carbon is screwed into the tip of the hollow contact tip 2 made of a copper alloy, and the protection tube 13 covers the entire tip of the contact tip 2. Covering. Further, as shown in FIG. 2, the tip of the nozzle 6 made of a copper alloy is made of graphite carbon, has an outer diameter corresponding to the inner diameter of the nozzle 6, and has a brim at the tip. The cylinder 14 is screwed in, and the cylinder 14 covers the tip of the nozzle 6 and the entire inner surface of the tip. A contact tip 2 whose outer surface is covered with the protective tube 13 and a nozzle 6 whose inner surface is covered with a cylinder 14 are incorporated in a welding torch 1 as shown in the sectional view of FIG.

When the welding torch 1 configured as described above is used, for example, as shown in FIG. 6, when the welding operation is performed in the upward posture, the spatter 12 is surrounded by the welding torch 1 during welding. Scatter on. Part of the scattered spatter 12 enters between the nozzle 6 and the contact tip 2 and adheres to the inner surface of the nozzle 6 and the surface of the contact tip 2. The inner surface of the nozzle 6 to which the spatter 12 adheres is covered with a cylinder 14 of graphite-based carbon having heat resistance, and the surface of the contact tip 2 is also covered with a protective tube 13 of graphite-based carbon. Even if the high temperature slag or the spatter 12 composed of metal particles adheres, it is possible to prevent the spatter 12 from being welded.

When the welding is continuously repeated for a long period of time, the spatter 12 that has entered between the nozzle 6 and the contact tip 2 is successively deposited between the nozzle 6 and the contact tip 2 to form a ring shape. Therefore, after welding a certain span, the welding torch 1 that had been welded in the upward position is rotated 180 degrees as shown in the perspective view of FIG. 4, and the tip of the welding torch 1 is directed downward. Vibration is applied to the welding torch 1. At this time, since the contact surface between the nozzle 6 of the sputter 12 and the contact tip 2 which have a ring shape is not welded, the contact surface between the nozzle 6 and the contact tip 2 of the sputter 12 which has a ring shape is separated by this vibration. To do. When vibration is applied to the welding torch 1, the ring-shaped spatter 12 separated from the surfaces of the nozzle 6 and the contact tip 2 slides down along the surface of the nozzle 6 and the contact tip 2. When the ring-shaped spatter 12 slides off, the surfaces of the nozzle 6 and the contact tip 2 are covered with a graphite-based carbon having good lubricity, so the ring-shaped spatter 12 can be easily slid off and removed. Can be released into parts. In this way, the spatter 12 deposited between the nozzle 6 and the contact tip 2 can be easily removed, so that the spatter 12 can be removed in a short time before the start of welding.

In the above embodiment, the case where the inner surface and the tip of the nozzle 6 are covered with the cylinder 14 of graphite type carbon has been described, but if the outer surface of the nozzle 6 is also covered with the graphite type carbon. The spatter 12 attached to the outer surface of the nozzle 6 can also be easily removed.

Further, in the above embodiment, the case where the surfaces of the contact tip 2 and the nozzle 6 are coated with a graphite-based carbon having heat resistance and lubricity has been described, but the surfaces of the contact tip 2 and the nozzle 6 are sandblasted. Etc., and then spraying non-oxide ceramics such as silicon nitride and silicon carbide or oxide ceramics such as alumina, which has a high altitude excluding the screw part and is excellent in heat resistance and wear resistance, The surfaces of the contact tip 2 and the nozzle 6 may be covered with ceramics.

When the surfaces of the nozzle 6 and the contact tip 2 are covered with the ceramics having a low affinity with the metal as described above, it is possible to prevent the spatter 12 from being welded, and the welding torch 1 is directed downward. It is possible to easily remove the deposited spatter 12 simply by shaking or applying a small vibration.

[0016]

[Effect of device]

 As described above, according to the present invention, since the contact tip of the welding torch and the surface of the nozzle are coated with graphite-based carbon or ceramics having high heat resistance and good lubricity, spatter spattered during welding is contact tip. It is also possible to prevent welding to the nozzle surface.

Further, even if spatter enters between the contact tip and the nozzle and accumulates, the deposited spatter is prevented from being deposited on the surface of the contact tip or nozzle. Even if it gets in and accumulates, the spatter that accumulates can be easily separated and removed from the surface of the contact tip and nozzle simply by applying vibration to the welding torch, and the preparation time for welding is greatly reduced. It is possible to prevent the occurrence of welding defects.

[Brief description of drawings]

FIG. 1 is a sectional view showing a contact tip of a welding torch according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a nozzle of the above embodiment.

FIG. 3 is a sectional view showing a welding torch according to the above embodiment.

FIG. 4 is a perspective view showing a step of removing spatter.

FIG. 5 is a cross-sectional view showing a conventional welding torch.

FIG. 6 is a perspective view showing a welding operation state in an upward posture.

FIG. 7 is a perspective view showing conventional removal of spatter.

[Explanation of symbols]

 1 Welding torch 2 Contact tip 6 Nozzle 13 Protective tube 14 Cylinder

Claims (2)

[Scope of utility model registration request] 1. A welding torch characterized in that the surface of a contact tip and the inner surface of a nozzle or the inner and outer surfaces of a nozzle are coated with graphite-based carbon. 2. A welding torch wherein the surface of the contact tip and the inner surface of the nozzle or the inner and outer surfaces of the nozzle are coated with ceramics.