JPH055272U - Spatter adhesion prevention tool for arc welding - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a spatter adhesion preventive tool for preventing a defect due to adhesion of spatter in a welding torch of a consumable electrode type arc welder, for example. [Structure] The surface of the contact tip body of the MIG welding machine or the inner wall surface of the gas nozzle is covered with a heat-resistant insulating resin such as Teflon tube, and the sputter stack on the contact tip and the sputter stack on the gas nozzle are in contact with each other. However, electrical contact should not occur between the contact tip and the gas nozzle. With this configuration,
Even if the gas nozzle comes into contact with the non-welded material on the cathode side, no electric contact (short-circuit) occurs between the contact tips on the anode side, and there is no problem that work is interrupted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is applicable to, for example, spatter deposition of a welding torch in a consumable electrode type arc welder. Regarding preventive equipment.

[0002]

[Prior art]

  Conventionally, arc welding such as MIG welding is performed by welding in an inert gas atmosphere. Arc is generated between the electrode wire of the material and the material to be welded, and the heat is used for welding. However, if spatter adhered to the welding torch during welding, various problems occurred. That is, the MIG welding machine uses the workpiece W as shown in FIG. 4 as the negative electrode. , The core wire 53 in the contact tip 52 of the welding torch 51 as the positive electrode , Welding is performed while feeding an inert gas into the gas nozzle 54, but melts during welding. So-called spattering in which small metal particles are scattered occurs and adheres to the inner surface of the gas nozzle 54. Sputter stack 55 and sputter stack 5 attached to the surface of contact chip 52 6 comes into contact with each other, the lower end of the gas nozzle 54, for example, as shown in FIG. If a part of the part touches the material W to be welded, it will be in an electric contact (short) state and I had to interrupt my work.   For this reason, when such a situation occurs, the worker temporarily suspends the work, and the gas nozzle 54 is removed from the bush 57, and the sputter stack 55 in the gas nozzle 54 and the After removing and cleaning the sputter stack 56 of the contact tip 52, a gas nozzle It is necessary to attach 54 to the bush 57 again and restart the work. It has significantly hindered business.   Therefore, protection from such spatter or early elimination is necessary to improve workability. It is essential, for example, the contact tip 52 of the welding torch 51 is a copper alloy material, By forming the gas nozzle 54 from a conductor alloy material or the like, a spa of a material to be welded of an iron-based member can be obtained. It has a structure that does not easily adhere to the cutter, or the high melting point of Japanese Utility Model Laid-Open No. 63-66577. On the surface of the contact tip, such as "metal-coated contact tip for arc welding" A high melting point metal coating having a melting point of 2500 ° C. or higher is used, or according to JP-A-61-296969. For contact tips such as "Ceramic coated arc welding contact tips" A ceramic coating layer is formed on the surface, or as disclosed in JP-A-61-111783. There have been many proposals such as making the torch nozzle made of ceramic.

[0003]

[Problems to be solved by the device]

  However, if the contact tip 52 and other materials are made of copper alloy, the spa There is a limit to the attachment prevention of the cutter, and other methods such as coating with ceramic etc. There is a problem that it takes time and is expensive.

[0004]

[Means for Solving the Problems]

  In order to solve such a problem, the present invention has a contact tip body in a gas nozzle. In the arc welding machine provided, make the surface of the contact tip body heat resistant. Covered with a resin with excellent insulating properties.   The inner wall surface of the gas nozzle was covered with an insulating resin having excellent heat resistance.

[0005]

[Action]

  To cover the surface of the contact tip body or the inner surface of the gas nozzle with an insulating resin As a result, even if the sputter layers are in contact with each other, they must not be in the electrical contact state. Yes. That is, there is no problem that the work is interrupted during the welding work.   Further, it can be constructed inexpensively and easily.

[0006]

【Example】

  An embodiment of a spatter adhesion prevention tool for arc welding according to the present invention will be described with reference to the attached drawings. I will explain.   Figure 1 (A) shows a torch nozzle in which the contact tip body is covered with a Teflon tube. FIG. 2B is a vertical cross-sectional view of the gas nozzle, FIG. 2A is an improved example thereof, and FIG. Fig. 3 is a vertical cross-sectional view of a torch nozzle covered with grease. Here is an example of use.

[0007]   As shown in FIG. 1, the welding torch 1 includes a gas nozzle 4 screwed to a bush 7, The gas diffuser 8 with its tip facing the inside of this gas nozzle 4 and this gas diffuser The contact tip 2 screwed to the tip of the laser 8 is provided. An arc is generated between the core wire 3 provided inside and the material W to be welded, and the core wire is generated by the heat. 3 is melted and welded. Therefore, the material to be welded is minus and the core wire 3 is The core wire 3 is fed at a constant speed as an electrode of the nozzle. At this time, the gas diffuser 8 An inert gas such as argon gas is supplied from inside to shield the periphery of the arc.

[0008]   Here, the contact tip 2 of the present invention has a Teflon tube made of fluorine resin on the outer periphery. Cover 10 This Teflon tube 10 is better than other plastics. All of them have excellent heat resistance, melting resistance from high heat, and electrical insulation. Even when the cap 2 is covered, it can be easily removed from the contact tip 2 by heating and softening it. It has the characteristic that it can be fitted into the circumference.

[0009]   Therefore, the welding torch 1 adheres to the inner wall surface of the gas nozzle 4. The sputter stack 5 and the sputter stack 6 attached to the outer peripheral surface of the contact chip 2 are in contact with each other. When touched, there is no electrical connection between the contact tip 2 and the gas nozzle 4, i.e. gas Even if a part of the nozzle 4 comes into contact with the material W to be welded, it is possible to work by touching it electrically. There is no such a problem that is interrupted.

[0010]   By the way, as shown in (B), the Teflon tube 11 is also attached to the lower surface of the contact tip 2. It is intended to be covered. This is the contact tip 2 as shown in FIG. Eliminates problems such as clogging of the outlet of core wire 3 due to sputter stack 6 attached to the bottom surface The Teflon tube 11 covers the sputter stacking layer. It is difficult to cause.

[0011]   Next, FIG. 2 shows that the inner wall surface of the gas nozzle 4 is covered with the urethane sheet 12. It is a thing. In this case as well, the contact chip due to the contact between the sputter laminated layers 5 and 6 There is no electrical connection between the nozzle 2 and the gas nozzle 4, and the same effect is exhibited.   Further, in FIG. 7B, the lower end portion of the urethane sheet 13 is folded back so that The end surface is covered, and the gas nozzle 4 Even if the lower end of the contacting member W contacts the welded material W, no electrical conduction occurs.

[0012]   Furthermore, FIG. 3 shows that the surface of the contact tip 2 is covered with a Teflon tube 10. In addition, the inner wall surface of the gas nozzle 4 is covered with the urethane sheet 12. And, in this case, the effect of preventing the electric contact is further enhanced.

[0013]

[Effect of device]

  As described above, the spatter adhesion preventive tool of the present invention can be used for arc welding such as MIG welding. Conventionally, the spatter that adheres to contact tips and gas nozzles has been Causes work to be interrupted, resulting in mental fatigue for workers due to increased downtime. However, it is possible to eliminate such adverse effects and at the same time remove It is also possible to eliminate the physical burden on workers such as.   Moreover, the structure of the present invention has the effect of being extremely simple and inexpensive.

[Brief description of drawings]

FIG. 1A is a vertical sectional view of a torch nozzle in which a contact tip body is covered with a Teflon tube, and FIG. 1B is a further improved example thereof.

FIG. 2A is a vertical cross-sectional view of a torch nozzle in which an inner surface of a gas nozzle is covered with an insulating resin, and FIG. 2B is a further improved example thereof.

FIG. 3 Example in which the contact tip body is covered with a Teflon tube and the gas nozzle inner surface is covered with an insulating resin.

FIG. 4 is a vertical sectional view of a conventional torch nozzle.

[Explanation of symbols]

1 welding torch 2 contact tips 4 gas nozzles 5,6 Sputter lamination 10,11 Teflon tube 12,13 Urethane sheet

Claims (2)

[Scope of utility model registration request] 1. An arc welding machine in which a contact tip body is provided in a gas nozzle, wherein the surface of the contact tip body is covered with an insulating resin having excellent heat resistance. Ingredient 2. An arc welding machine having a contact tip body provided in a gas nozzle, wherein an inner wall surface of the gas nozzle is covered with an insulating resin having excellent heat resistance. .