JPS633746Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to improving a welding torch, preventing overheating of its inert gas nozzle, reducing production costs,
The purpose is convenience of operation. The general construction of an arc welding torch, which uses a welding wire as a consumable electrode and performs welding work while shielding the welding area with an inert gas such as carbon dioxide or argon, is as shown in FIG. In FIG. 1, reference numeral 1 denotes a torch cable (conduit cable), which guides a welding wire to the torch portion and has a built-in conductor through which welding current flows. Reference numeral 2 denotes a crimp connection tube, which is attached to the end of the torch cable 1. 3 is a nozzle, which is a chip (not shown) that applies welding current to the welding wire.
is installed internally. 4 is a connecting pipe, and 5 is an insulating tube, one end of which is attached to the connecting tube 4, and the other end of which the nozzle 3 is attached. A connector 6 connects the connecting pipe 4 and the crimp connecting pipe 2.
Reference numeral 7 denotes a gas hose for sending inert gas from the outside through the connecting pipe 4 and the nozzle 3 to the welding location. 8 is a switch lever, 9 is a micro switch, and switch lever 8 controls the intermittent welding current.
Do it through. Reference numeral 10 denotes a holder that houses and protects the connecting portion between the torch cable 1 and the connecting pipe 4, the connecting portion between the connecting pipe 4 and the gas hose 7, the micro switch 9, the switch lever 8, and the like. Recently, in the field of arc welding that uses carbon dioxide gas, carbon dioxide gas + argon gas has been used as shielding gas to reduce spatter. As a result, the amount of heat generated by the arc increases, and the nozzle closest to the arc may overheat and become deformed, or in extreme cases, the tip of the nozzle may crack. Pure copper, which has good thermal conductivity, is generally used as the material for the nozzle. This reduces the amount of spatter that adheres to the nozzle, and allows for easy removal of spatter that has once adhered. However, since copper begins to soften at around 150℃,
As mentioned above, if carbon dioxide + argon gas is used as the shielding gas, the temperature of the nozzle can exceed 600°C, so even a small amount of force will deform it, making it impossible to use it again. Therefore, the first idea was to increase the thickness of the nozzle so that it would not easily deform even at high temperatures. This nozzle is called a high usage rate nozzle, and the one before that is called a standard nozzle. FIG. 2 shows these conventional nozzles. Figure 2 a is a standard nozzle, and its wall thickness t is 1.5 mm.
2 mm, and FIG. 2b shows a high usage rate nozzle whose wall thickness t is 3.5 mm to 5 mm. As explained above, a high usage rate nozzle is less likely to deform at high temperatures than a standard nozzle due to its large wall thickness, but it is still heavy and subject to overheating. In this invention, an outer tube made of a light alloy such as aluminum is tightly fitted into a nozzle inner tube made of copper or copper alloy, and spline-shaped heat dissipation fins are provided on the entire outer circumferential surface of the nozzle in the length direction. It is something that FIG. 3 shows another embodiment of the present invention, in which 13
14 is a nozzle inner cylinder made of copper, and 14 is an outer cylinder with fins 12 made of aluminum, into which the copper nozzle inner cylinder is press-fitted. This embodiment is especially designed for mass production, and the aluminum finned outer cylinder 14 has fins parallel to the outer cylinder axis A-A' as shown in FIG. can be used, so it can be manufactured at low cost. If these fins are provided perpendicularly to the outer cylinder axis A-A' as shown in the unevenness shown in Figure 4a, drawn material cannot be used, and the fins must be cut out, resulting in higher costs. That cannot be avoided. Next, we will examine the weight of the conventional nozzle and the finned nozzle of the present invention, and under certain conditions: using carbon dioxide + argon gas as shielding gas, using a mild steel wire at a voltage of 38V, a welding current of 350A, and a distance between the nozzle and base materials. When welding with a diameter of 20 mm, the nozzle temperature will be as shown in Table 1.

[Table] As is clear from Table 1, the nozzle according to the embodiment of the present invention has a welding temperature of 80° to 80° compared to the standard nozzle.
100℃ lower, 20℃~40℃ compared to high usage rate nozzles
℃low. Although the weight of the nozzle according to the embodiment of the present invention is heavier than a standard nozzle, it is 10g to 90g (5% to 40%) lighter than a high usage rate nozzle. As described above, the present invention has the following excellent effects. (b) Since the torch is formed by closely fitting an aluminum outer cylinder into an inner cylinder made of copper or copper alloy, it has greater strength even at high temperatures than one made of aluminum alone, and the entire torch is made of copper. It also has the advantage of being lighter and easier to work with than those made of copper alloy. (b) Heat dissipation fins are provided on the outer circumferential surface of the outer cylinder, so the torch does not overheat. (c) Since the heat dissipation fins are provided on the outer circumferential surface of the outer cylinder over the entire length thereof, the outer cylinder can be made from drawn material, so production costs can be reduced. (d) Since the torch is formed of an inner cylinder and an outer cylinder, it is economical because only the damaged cylinder can be replaced.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the configuration of a general torch;
Fig. 2a is a perspective view of a conventional standard nozzle, Fig. 2b is a perspective view of a conventional high usage rate nozzle, Fig. 3 is a perspective view of an embodiment of the present invention, and Figs. 4a and b are directions of the fins. FIG. 11... Nozzle with fins, 12... Fins, 1
3... Nozzle inner cylinder, 14... Outer cylinder with fins.

Claims (1)

[Scope of utility model registration request] In an arc welding torch that uses a welding wire as a consumable electrode and shields the welding area with an inert gas such as carbon dioxide or argon gas, a light material such as aluminum is used in the nozzle inner tube made of copper or copper alloy. 1. A welding torch, characterized in that a cylindrical outer cylinder made of an alloy is tightly fitted, and heat dissipation fins are provided on the outer surface of the outer cylinder in a spline shape in the length direction of the outer cylinder.