JPH0857652A - Shield nozzle for narrow gap welding - Google Patents

Abstract

PURPOSE: To change the part greatly damaged only, further to reduce production cost and to make mounting/dismounting easy by making a shield nozzle for narrow gap welding changeable and separate type. CONSTITUTION: Left/right symmetrical two lower nozzles B for improving shielding of weld zone are mounted under an upper nozzle A for narrow gap welding. By fitting two fastening holes 4 arranged in the longitudinal direction of upper nozzle A to projecting parts arranged to both faces in the longitudinal direction of lower nozzles B, Joining between the upper nozzle A and lower nozzles B is integrated by inserting lower nozzles B, B to the upper nozzle A from rear. In welding in a narrow gap with use of this shield nozzle, the tip of shield nozzle is close to weld zone and is exposed to high temp. to be eroded and the shielding performance is deteriorated. In this case, the lower nozzle only is simply changed and welding is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a narrow groove welding shield nozzle for supplying a shielding gas to a narrow groove welding portion.

[0002]

2. Description of the Related Art FIG. 5 shows a narrow groove welding torch using a conventional shield nozzle. In FIG. 5, 11 is a welding wire to be fed, 12 is a torch main body, 13 is a tip rotation drive shaft which is fitted in the torch main body 12 and into which the welding wire 11 is inserted, and which is connected to a gear 14 and a rotating disk 15. Has been done. The rotating disk 15 is provided with a hole or groove through which the light of the photomicrosensor 16 passes.
Is fixed to a support 17 so that the tip rotation angle can be adjusted, and is attached to the torch body 12. Reference numeral 18 denotes a gear directly connected to a chip rotation driving motor 19,
It meshes with the gear 14.

Therefore, the gear 1 is driven by the motor 19.
The chip rotation drive shaft 13 is rotated via 8 and 14, and the rotation angle in this case is adjusted by the relative position of the photomicrosensor 16 with respect to the rotary disk 15.

A conventional integral type shield nozzle is attached to the lower portion of the torch body 12. As shown in FIG. 4, the integral box-shaped shield nozzle C has a chip hole 1 through which a chip penetrates in the central portion of the upper end portion, a plurality of shield gas holes 2 on both sides thereof, and bolt holes 3 at both end portions of the upper end portion. The shield nozzle C is attached to the lower part of the torch body 12 which is the upper structure by the bolt 3'through the bolt hole 3.

Shield gas hole 2 of the shield nozzle C
Is a shield gas introduction pipe 2 provided in the torch body 12.
A shield gas (inert gas such as Ar) supplied from 0 is jetted from the lower part of the shield nozzle C, and a tip rotating drive shaft 13 and a tip made of a welding wire 11 penetrate through the tip hole 1.

In FIG. 5, 21 is a cooling water inlet of the torch body, and 22 is its outlet.

The shield nozzle C injects the shield gas from the lower portion thereof as described above in order to shield the narrow groove weld portion from the atmosphere.

[0008]

The conventional integrated shield nozzle described above supplies a shield gas (an inert gas such as Ar) for shielding the narrow groove weld portion from the atmosphere, but the tip of the nozzle is used. If the metal melts and loses its shape, the shield performance of the welded part deteriorates, so replace the shield nozzle.

However, since the shield nozzle has the shield gas hole for supplying the shield gas and is formed so that the chip penetrates, the shield nozzle has a complicated shape and is not inexpensive as a consumable item. In addition, the shield region may be widened depending on the shape of the welding groove, but at this time, it is advantageous that the tip of the shield nozzle is long, and it takes time and effort to replace the entire nozzle.

The present invention is intended to provide a shield nozzle for narrow groove welding which can solve the above problems.

[0011]

According to the present invention, a shield nozzle for narrow groove welding which supplies a shield gas to a narrow groove welding portion is a split type in which the shield nozzle can be replaced.

[0012]

In the shield nozzle for narrow groove welding, the tip close to the welded portion is melted due to adhesion of spatter or exposure to high temperature, and the shield performance is deteriorated. Therefore, in the present invention, the shield nozzle is replaced. Since it is a replaceable split type, only the severely damaged parts can be replaced, and it can be attached and detached with one touch, improving work efficiency. Moreover, since the shield nozzle is of a split type, it is easy to process.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The present embodiment relates to a split type box-shaped shield nozzle used in the welding torch shown in FIG. 5 instead of the integrated shield nozzle shown in FIG.

In this embodiment, a chip hole 1 provided at the center of the upper end and through which a chip penetrates, a plurality of shield gas holes 2 provided on both sides of the chip hole, and further connected to an upper structure on both sides of the upper end. Nozzle A with bolt holes 3 for
The upper nozzle A is composed of two symmetrical lower nozzles B for improving the shield property of the welded portion. Also,
The upper nozzle A and the lower nozzle B are joined to each other by two stop holes 4 provided on each side of the upper nozzle A in the longitudinal direction.
And the convex portions 5 provided on both surfaces of the lower nozzle B in the longitudinal direction are fitted to each other, so that the lower nozzles B and B are connected to each other.
It is integrated by inserting it from below.

When the shield nozzle according to this embodiment described above is used in the welding torch shown in FIG. 5 to weld in the narrow groove, the tip of the shield nozzle is exposed to high heat and melts and melts because it is close to the welded portion. Since the shield performance is deteriorated when melted, the entire shield nozzle C is replaced in the conventional integrated type, but only the lower nozzle B is replaced in this embodiment. Further, when only one of the lower nozzles B is significantly melted and damaged, only one of them may be replaced. Therefore, the upper nozzle A having a complicated shape does not need to be replaced, and the lower nozzle B can be easily replaced to perform welding again.

If it is desired to elongate the tip of the shield nozzle in order to widen the shield area due to the shape of the weld groove, it is possible to easily cope with this by replacing the lower nozzle B. it can.

[0017]

In the conventional integrated type shield nozzle, it was necessary to replace the whole even if it was partially melted. However, since the shield nozzle of the present invention is a replaceable split type, only the part with significant damage is required. Can be replaced, the manufacturing cost is low, and the attachment / detachment is easy.

[Brief description of drawings]

FIG. 1 is an external view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the embodiment.

FIG. 3 is an external view of a lower nozzle of the embodiment.

FIG. 4 is an external view of a conventional integrated shield nozzle.

FIG. 5 is an external view of the entire conventional narrow groove welding torch.

[Explanation of symbols]

 A Upper nozzle B Lower nozzle 1 Tip hole 2 Shield gas hole 3 Bolt hole 4 Stop hole 5 Convex part

Claims (1)

[Claims] 1. A shield nozzle for narrow groove welding, which is a shield nozzle for narrow groove welding that supplies a shield gas to a narrow groove weld portion, wherein the shield nozzle is a replaceable split nozzle.