JP2002018572A - Nozzle for vertical underwater welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form stable voids around an arc and a molten pool when welding in a vertical position. SOLUTION: A nozzle for underwater welding is composed so that a Fallopian tube shaped water curtain d is formed by curtain water w being spouted out from the water curtain outlet 16 of the welding nozzle 1, and a local void e is formed inside the water curtain d by a shielding gas (a) flowed inside the water curtain d from a shielding gas spouting-out hole 11. The shielding gas spouting-out hole 11 and a torch 2 are tilted toward an oblique lower part to the welding nozzle 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a trumpet-shaped water curtain formed by curtain water ejected from a water curtain outlet of a welding nozzle, and to the water by a shield gas flowing from a shield gas ejection hole to the inside of the water curtain. The present invention relates to a nozzle for underwater welding that forms a local cavity inside a curtain.

[0002]

2. Description of the Related Art Conventionally, a trumpet-shaped water curtain is formed by curtain water ejected from a water curtain outlet of a welding nozzle, and the inside of the water curtain is shielded by a shield gas flowing from a shield gas ejection hole to the inside of the water curtain. Underwater welding nozzles have been proposed in which a local cavity is formed to remove water from around an arc or a molten pool.

[0003]

However, when welding is performed in the vertical position, the torch angle becomes horizontal, so that the shielding gas a ejected from the nozzle 61 is discharged upward as shown in FIG. There is water intrusion from the bottom of the building. For this reason, there was a problem that it was difficult to stabilize the cavity around the arc or the molten pool.

The present invention has been made in view of such a conventional problem, and an object thereof is to form a vertical cavity capable of forming a stable cavity around an arc or a molten pool when welding is performed in a vertical position. It is an object of the present invention to provide a nozzle for underwater welding.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a wrapper-shaped water curtain formed by curtain water ejected from a water curtain outlet of a welding nozzle, and a water curtain formed from a shielding gas ejection hole. In a submerged welding nozzle that forms a local cavity inside the water curtain by a shielding gas flowing inside the nozzle, the shield gas ejection hole and the torch are inclined obliquely downward with respect to the welding nozzle. And

As described above, by inclining the shield gas ejection hole and the torch obliquely downward with respect to the welding nozzle, the shield gas is ejected obliquely downward with respect to the welding nozzle, and the welding is performed in a vertical position. In this case, a stable cavity can be formed around the arc and the molten pool.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a vertical underwater welding nozzle (hereinafter, referred to as a welding nozzle) 1 of the present invention is used by being attached to the tip of a commercially available torch 2.

The welding nozzle 1 mainly includes a connecting screw portion 3, a main body 4, first and second two partition walls 5, 6, an outer cylinder 8, and a pair of square nozzle portions 45.

The main body 4 has a torch insertion hole 10 at its axial center, and a torch insertion hole 10 at its tip.
So that the inner surfaces of the first partition wall 5 are flush with each other.
Is attached to form the shield gas ejection hole 11. The first partition 5 has a conical portion 12 at its tip.

The torch insertion hole 10 and the shield gas ejection hole 11 are inclined by an angle θ with respect to the axis A of the main body 4, so that the tips of the holes 10, 11 are directed obliquely downward. I have.

Accordingly, when a torch tip 20 described later is mounted in the torch insertion hole 10, the torch 2 is directed obliquely downward with respect to the axis A of the main body 4. In the figure,
The symbol B indicates the torch insertion hole 10 and the shield gas ejection hole 1
1 shows the axis.

Most of the second partition 6 is cylindrical, and is arranged concentrically with the axis A of the main body 1. And, it has a horn 13 at its tip. Furthermore, the second
Is fixed to the main body 4 via the outer cylinder 8 so that the wrapper portion 13 and the conical portion 12 of the above-mentioned first partition wall together form the water curtain outlet 16. Outer cylinder 8
Is provided with a water supply hose connection portion 17.

The welding nozzle 1 is attached to the tip of the torch 2 via a connection screw 3 fitted in a hole 19 at the rear end of the main body. The welding wire 21 and the shielding gas a are supplied through the inside. Shielding gas a
Is supplied from a hole 22 provided on a side surface of the torch tip 20.

Further, a pair of upper and lower rectangular nozzle portions 45 are provided at the tip of the welding nozzle 1. Each of the square nozzle portions 45 is formed of a pair of cantilever plates 45 a and 45 b provided so as to sandwich an extension (not shown) of the water curtain outlet 16, and one of the cantilever plates 45 a is connected to the wrapper portion 13.
The other cantilever plate 45b is attached to the conical portion 1
2 attached.

As shown in FIG. 2, the cantilever plate 45 is formed in a trapezoidal shape, a V shape, a U shape, or the like in accordance with the groove shape. The cantilever plate 45 is made of a metal such as copper, which is easy to process, or a material having high heat resistance and flexibility, such as heat resistant rubber. The gap between both cantilever plates 45a and 45b is
It is desirably the same as the gap at the water curtain outlet 16.

Next, the vertical position welding using the welding nozzle will be described.

In the case of welding in a vertical position, as shown in FIG. 3, the welding shaft, that is, the groove 52 of the one-sided butt joint member 51 is substantially vertical, so that the welding nozzle 1 is held horizontally. Weld in condition.

At this time, the curtain water w introduced from the water supply hose connection portion 17 is rectified during the U-turn of the second partition 6 and communicates with the annular water curtain outlet 16 and the water curtain outlet 16. A jet is uniformly ejected from the periphery of the rectangular nozzle portion 45 forming a trumpet-shaped water curtain d.

On the other hand, as described above, since the shield gas injection hole 11 and the torch tip 20 are inclined obliquely downward by the angle θ with respect to the axis A of the welding nozzle body 4,
The shielding gas a supplied from the hole 22 provided on the side surface of the torch tip 20 is ejected obliquely downward from the shielding gas ejection hole 11 to form a stable cavity e around the arc f and the molten pool g. . Since this cavity e is located below the axis A of the welding nozzle body 1, water can be prevented from entering from below the water curtain d.

As described above, according to the present invention, the shield gas injection hole 11 and the torch 2 are inclined obliquely downward with respect to the welding nozzle 1. When it is jetted and welded in a vertical position, a stable cavity e can be formed around the arc and the molten pool.

[0022]

As described above, according to the present invention, the shielding gas ejection hole and the torch are inclined obliquely downward with respect to the welding nozzle, so that the shielding gas is ejected obliquely downward with respect to the welding nozzle. When welding in a vertical position, a stable cavity can be formed around an arc or a molten pool. Since this cavity is located below the axis A of the welding nozzle body, it is possible to prevent water from entering from below the water curtain.

[Brief description of the drawings]

FIG. 1 is a side view including a partial cross section of a vertical underwater welding nozzle according to the present invention.

FIG. 2 is a cross-sectional view of the welding nozzle according to the present invention.

FIG. 3 is an operation explanatory view of the welding nozzle according to the present invention.

FIG. 4 is an explanatory view of a conventional shield gas injection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding nozzle 2 Torch 11 Shield gas ejection hole 16 Water curtain outlet a Shield gas d Water curtain e Cavity w Curtain water

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takahiro Irie No. 1 Yawata Kaigandori, Ichihara City, Chiba Prefecture Mitsui Engineering & Shipbuilding Co., Ltd. Chiba Works F-term (reference) 4E001 AA03 BB06 DA03 DF08 4E081 AA01 BA40 CA07 DA20 DA76 EA07

Claims (1)

[Claims] 1. A trumpet-shaped water curtain is formed by curtain water spouting from a water curtain outlet of a welding nozzle, and a local part of the inside of the water curtain is formed by a shielding gas flowing from the shielding gas jetting hole to the inside of the water curtain. A vertical underwater welding nozzle, wherein the shield gas ejection hole and the torch are inclined obliquely downward with respect to the welding nozzle.