JPH022554Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a side nozzle type welding torch that suppresses the temperature rise of the welding torch.

Generally, there are various types of welding torches used for automatic and semi-automatic arc welding, depending on the purpose of use.For example, welding torches are used for fillet welding in narrow spaces where there is no space perpendicular to the welding direction. In this case, a so-called side nozzle type welding torch is used, in which a gas nozzle for ejecting shielding gas is provided on the side of the welding torch body, and the shielding gas is supplied to the welding part from the side of the welding torch.

However, this type of welding torch has a structure in which the tip of the gas nozzle protrudes toward the workpiece, so the tip of the gas nozzle comes into contact with the workpiece during welding, and the welding current flows through the gas nozzle, causing the gas nozzle to overflow. Conventionally, the gas nozzle was attached to a bracket protruding from the side of the welding torch body via an insulator to electrically insulate the gas nozzle from the welding torch body. This prevented damage to the gas nozzle.

Therefore, even though relatively low-temperature shielding gas is supplied to the gas nozzle, this gas can hardly be expected to have any cooling effect on the welding torch. At present, sufficient concrete countermeasures have not been taken.

Therefore, when welding is performed continuously in a very narrow space, such as when fillet welding automobile wheels, etc., the temperature of the welding torch increases rapidly, causing the tip at the tip of the welding torch to deteriorate. There is significant wear and tear, and the threaded joint between the welding torch and the tip is sewn up, making it impossible to replace the tip.
Alternatively, an increase in electrical resistance as the temperature rises causes various problems such as deterioration in power supply to the welding wire.

The present invention was developed in view of these circumstances, and its purpose is to suppress the temperature rise of the welding torch, and to develop a side nozzle type that can solve the above-mentioned conventional problems all at once. The point is to provide welding torches.

The present invention is characterized in that it is constructed as follows to achieve the above object.

That is, the gas nozzle is attached to the side of the welding torch body via a bracket with good thermal conductivity, and the shielding gas supplied to the gas nozzle is made to flow through the bracket to cool the welding torch via the bracket. By forming a gas flow path, it is possible to effectively suppress the temperature rise of the welding torch by using the shielding gas necessary for welding work, preventing wear of the tip and seizure of the threaded part between the welding torch and the tip. Therefore, it is possible to prevent deterioration of the power supply performance to the welding wire.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

1 is a welding torch body, and a tip 2 is removably screwed onto the tip of the welding torch body.

Reference numeral 3 denotes a welding wire supply cable connected to the upper end of the welding torch body, and a welding wire (not shown) fed through the cable 3 is inserted into the welding torch body 1 to supply the tip of the tip 2. Protrude more outward.

4 is a copper collar 5 on the outer periphery of the welding torch body 1.
A bracket made of copper with good thermal conductivity is fixed with a clamp bolt 6 through the bracket 4, and a hollow cylindrical male screw 7 is fixed to the lower side of the tip of the bracket 4, and the inner circumference of the male screw 7 is The orifice 8 and the base end of the gas nozzle 9 are inserted into the section, and the gas nozzle 9 is fixed so that it cannot be removed by a tightening nut 10 that is screwed onto the outer periphery of the male screw 7.

Further, a cap 11 for supplying shielding gas is screwed onto the upper surface of the tip of the bracket 4 at a position where the center of the cap 11 is offset from the center of the mounting portion of the gas nozzle 9, so that the cap 11 and the gas nozzle 9 are connected to each other. They are communicated via a crank-shaped gas flow passage 12 formed inside the bracket 4 and an outflow hole 8a of the orifice 8.

A gas tube (not shown) for supplying a shielding gas such as CO ₂ is connected to the tip of the mouthpiece 11, and the shielding gas at a temperature lower than room temperature is supplied to the gas nozzle 9 via the gas flow path 12. Supplied.

Further, to attach the bracket 4 to the welding torch main body 1, as shown in FIG.
A set bolt 1 is fixed so as to clamp the welding torch main body 1 with
4 prevents the bracket 4 from rotating relative to the welding torch body 1.

Furthermore, power is supplied to the welding torch body 1 via a conductor portion 15 fixed to the upper end of the welding torch body 1, and a power supply cable 16 is connected to a terminal portion 15a formed at the tip of this conductor portion 15. .

According to such a configuration, the shielding gas supplied through the base 11 flows through the gas flow passage 12 formed in the bracket 4 and the flow passage 8 of the orifice 8.
Since the gas is supplied to the gas nozzle 9 through the bracket 4, the welding torch body 1 and tip 2, which have become hot due to continuous welding, etc., are effectively cooled through the bracket 4, and the welding torch body 1 and tip 2 are cooled down. Since the temperature rise can be suppressed, consumption of the tip 2 can be prevented, and the threaded part between the welding torch body 1 and the tip 2 will not seize and the tip 2 will not be able to be replaced. It also solves the problem that power supply performance deteriorates due to an increase in electrical resistance as the temperature rises.

In particular, the gas flow passage 12 is not provided straight,
As shown in this embodiment, by providing the gas flow passage 12 in a crank shape, the cooling area of the gas flow passage 12 is increased, and a higher cooling effect can be obtained.

Incidentally, in the case of CO ₂ welding, the shielding gas supplied to the gas nozzle is used by passing liquefied carbon dioxide gas through a heater and vaporizing it, but the temperature at the time it is supplied to the nozzle 11 is lower than room temperature. The cooling effect was much lower, and when the fillets of the aforementioned automobile wheels were continuously welded, a remarkable cooling effect was confirmed compared to when a conventional welding torch was used.

In addition, some welding torches are forced water-cooled by circulating cooling water through the main body, but this method makes the welding torch complicated and expensive, and requires constant circulation of cooling water. However, by skillfully utilizing the shielding gas supplied to the gas nozzle 9 as in the present invention, the side nozzle has an extremely simple structure and is highly economical. type welding torch.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing how the bracket of the same embodiment is attached to the welding torch body. 1...Welding torch, 4...Bracket, 9...
Gas nozzle, 12... gas flow path.

Claims (1)

[Scope of utility model registration request] Attach the gas nozzle to the side of the welding torch body via a bracket with good thermal conductivity, and
A side nozzle type welding torch, characterized in that a gas flow path is formed in the bracket to allow a shielding gas supplied to the gas nozzle to flow therethrough to cool the welding torch through the bracket.