JPH091347A - Underwater tig welding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To achieve high quality welding results by freely performing underwater welding with a simple structure. [Structure] When a work 57 in water is welded underwater by a TIG welding torch body 30 immersed in water,
The dome-forming gas injection nozzle 43 provided on the outer periphery of the IG welding torch body 30 injects the dome-forming gas 42 toward the workpiece 57, and the dome-forming water injection nozzle 43 provided on the outer periphery of the dome-forming gas injection nozzle 43. Nozzle 4
By injecting the dome-forming water 49 from 6 toward the work 57, the water around the work 57 is locally drained to form the dome 61 in which no water enters, so that a chamber or the like is used. Underwater welding can be performed even without it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater TIG welding apparatus.

[0002]

2. Description of the Related Art When welding a work (material to be welded) submerged in water, conventionally, a welding portion for a work submerged in water is completely surrounded by a chamber to drain water from the chamber and After making the inside a shield gas atmosphere,
A welding torch is inserted into the chamber and the work is welded using the welding torch.

[0003]

However, in the case where the welding portion for the work is completely surrounded by the chamber, a very large chamber is required and the chamber is not versatile. Therefore, depending on the work. The chamber must be manufactured each time, which is uneconomical.

Moreover, unless the chamber is manufactured and positioned with high precision, the sealing property between the chamber and the work cannot be ensured, so that water may enter the chamber and the welding quality may be deteriorated. there were.

Furthermore, since moving the welding torch inserted into the chamber is mechanically complicated, it is difficult to bring the welding torch closer to the welding point at a free angle (that is, accessibility is improved). There were many restrictions on the welding position.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an underwater TIG welding apparatus capable of freely performing underwater welding with a simple structure to obtain a high quality welding result.

[0007]

The present invention relates to an underwater TIG welding apparatus in which a work in water is welded underwater by a TIG welding torch body immersed in water.
A dome-forming gas injection nozzle that can inject dome-forming gas toward the work is provided on the outer circumference of the IG welding torch body, and dome-forming water can be injected toward the work on the outer circumference of the dome-forming gas injection nozzle. The present invention relates to an underwater TIG welding device characterized in that a water injection nozzle for forming a dome is provided.

[0008]

[Function] When a work in water is to be underwater welded by the TIG welding torch body immersed in water, the dome forming gas is injected toward the work from the dome forming gas injection nozzle provided on the outer periphery of the TIG welding torch body. In addition, the dome-forming water jet nozzle provided on the outer periphery of the dome-forming gas jet nozzle jets the dome-forming water toward the work, so that the water around the work is locally drained, and Since the dome that does not enter is formed, underwater welding can be performed without using a chamber or the like.

[0009]

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

FIGS. 1 to 6 show an embodiment of the present invention. As shown in FIG. 1, a pipe 3 penetratingly arranged at the bottom of a large metal container 2 in which water 1 is stored. The case where fillet welding is performed on the bottom of the metal container 2 is illustrated.

In this case, a gate-type crane 63 is provided above the metal container 2, and the upper end of the hanging rope 4 is wound around the winch 65 attached to the traveling girder 64 of the crane 63, and the hanging rope 4 is The articulated robot 5 attached to the lower end is suspended in the water 1 inside the metal container 2, and the TIG welding torch 6 held at the tip of the articulated robot 5 performs underwater welding.

At the lower end of the articulated robot 5,
A positioning member 7 that clamps the upper end of the pipe 3 is rotatably mounted.

The TIG welding torch 6 according to the present invention has a structure as shown in FIG.

That is, the torch body block 11 having the cooling water jacket 10 is formed by fitting and fixing the body shaft portion 9 to the body cylindrical portion 8, and the body water shaft 10 and the cooling water jacket 10 are connected to each other. A cooling water supply passage 12 and a cooling water discharge passage (not shown) are formed to communicate with the end portion, a cooling water supply pipe 12 is connected to the cooling water supply passage 12, and a cooling water discharge flow is formed. A cooling water discharge pipe 14 (see FIG. 4) is connected to the passage to supply and discharge the cooling water 16 from a cooling water supply source 15 such as an underwater pump attached to the articulated robot 5 as shown in FIG. To get it.

Further, a welding electrode 18 such as a tungsten electrode is provided in an electrode insertion hole 17 formed on the tip side of the main body shaft portion 9.
Insert the electrode chuck 1 into the welding electrode 18
9 is externally fitted, and the chuck nut 2 is attached to the tip of the main body shaft portion 9.
The electrode chuck mechanism 21 is configured by screwing 0, and the electrode chuck 19 is tightened by the tapered surface 22 formed inside the chuck nut 20 so that the welding electrode 18 can be fixed.

Further, a large number of shield gas supply passages 24 extending in the axial direction 23 are formed inside the main body tubular portion 8 to form the main body tubular portion 8
While the shield gas nozzle 25 is screwed to the tip side of the
A shield gas supply pipe 27 is connected to an annular shield gas supply chamber 26 that is formed on the rear end side of the main body cylindrical portion 8 and communicates with the shield gas supply passage 24, and as shown in FIG.
Shield gas 29 such as an inert gas from a gas supply source 28 such as a gas cylinder arranged outside the metal container 2
To be able to supply.

The TIG welding torch body 30 is constructed as described above.

On the other hand, a tubular torch casing 31 is provided, and a dome-forming gas ejection plate 34 having a large number of dome-forming gas ejection holes 33 is provided in a step portion 32 formed on the inner peripheral side of the tip of the torch casing 31. By locking and screwing the insulating tubular member 35 into the torch casing 31 from the rear end side of the torch casing 31, the dome-forming gas ejection plate 34 is held between the torch casing 31 and the insulating tubular member 35. At the same time, the insulating cylinder member 35 is formed with a partition wall portion 37 that forms a pressure equalizing chamber 36 with the dome-forming gas ejection plate 34. Then, as shown in FIG. 3, a through hole 38 is formed in the partition wall portion 37 of the insulating tubular member 35, and a flow path forming member 40 having a dome forming gas supply flow path 39 is screwed into the through hole 38. A dome forming gas supply pipe 41 is connected to the rear end side of the dome forming gas supply passage 39 in the flow passage forming member 40 to supply a dome forming gas 42 such as an inert gas from the gas supply source 28. To be able to do.

The gas supply sources 28 may be separate from each other.

A dome-forming gas injection nozzle 43 for guiding the injection of the dome-forming gas 42 is attached to the tip of the torch casing 31.

Further, the dome-forming gas injection nozzle 43 is constructed by fitting the inner nozzle member 44 and the outer nozzle member 45, and the inner nozzle member 44 and the outer nozzle member 4 are formed.
5, an annular dome-forming water jet nozzle 46 is formed, and a dome-forming water supply pipe 47 is connected to the rear end side of the dome-forming water jet nozzle 46 to attach the submersible pump 5 to the articulated robot 5. The dome forming water 49 having a pressure higher than the water pressure can be jetted from the dome forming water source 48.

Although the cooling water supply source 15 and the dome forming water supply source 48 are shown as the same in FIG. 1 for convenience of drawing, they may be provided separately.

Further, a wire feeding hole 50 is formed in the partition wall portion 37 of the insulating tubular member 35 and the dome-forming gas ejection plate 34, and wire guides 51 and 52 are inserted and supported in the wire feeding hole 50. On the rear end side of the wire guides 51 and 52, as shown in FIG.
As shown in FIG. 3, a wire conduit 54 (a flexible tube formed by winding a metal wire and coated with Teflon on the outside of a flexible tube formed by winding a metal wire) guided from a waterproof chamber 53 installed on the water 1 is connected to the waterproof chamber 53. A welding wire 56 fed from a wire feeding device 55 housed inside
The wire conduit 54 and the wire guide 51,
The wire guides 51 and 52 are passed through the guide 52 and guided toward the welded portion 58 of the work 57.

In the figure, 59 is an electromagnetic valve provided on the side of the gas supply source 28 in the shield gas supply pipe 27,
Reference numeral 60 denotes an electromagnetic valve provided on the side of the gas supply source 28 in the dome forming gas supply pipe 41, and 61 denotes a dome forming gas 42 formed between the dome forming gas injection nozzle 43 and the welded portion 58. The dome 62 is a wire guide retainer.

Next, the operation of the present invention will be described.

First, prior to welding, the position and shape of a welded portion 58 such as a fillet welded portion with respect to the pipe 3 is measured by using a contact sensor or the like (not shown), and the obtained position data and the like are not shown in the welding controller. Enter in. The position data and the like may be measured, for example, by attaching a contact sensor instead of the TIG welding torch 6 to the tip of the articulated robot 5 in FIG. 1 and moving the articulated robot 5.

When the position and the like are measured in this way, the winch 65 of the crane 63 shown in FIG. 1 is hoisted to pull up the contact sensor together with the articulated robot 5 from the metal container 2 to the outside of the water 1 and the articulated robot 5 Of the TIG welding torch 6 instead of the contact sensor, and then the TIG welding torch 6 together with the articulated robot 5 is immersed in the water 1 and attached to the lower end of the articulated robot 5. The upper end of the pipe 3 is clamped by the positioning member 7 so as to restore the state of FIG.

Next, the dome-forming water supply source 48 such as the submersible pump attached to the articulated robot 5 is driven to drive the dome-forming water supply pipe 47 and the dome-forming water injection nozzle 4.
The dome-forming water 49 having a pressure higher than the water pressure is jetted toward a welded portion 58 such as a fillet welded portion between the pipe 3 and the metal container 2 via 6. At the same time, the electromagnetic valve 60 is opened to allow the dome-forming gas 42 from the gas supply source 28 to flow through the dome-forming gas supply pipe 41, the dome-forming gas supply passage 39 of the passage forming member 40, the pressure equalizing chamber 36, and the dome. Forming gas ejection hole 3
3. The dome-forming water 49 is injected through the dome-forming gas injection nozzle 43.

Then, the dome forming water 49 and the dome forming gas 42 locally forcibly drain the welded portion 58 to form a dome 61 of the dome forming gas 42 having no water 1 at the welded portion 58. It This can eliminate the need to use a special chamber or the like.

The injection amount of the dome-forming water 49 varies depending on the water depth, but is about 4 to 5 times or more that of the shield gas 29 described later. Similarly, the injection amount of the dome forming gas 42 is about 1 of the shield gas 29.
The amount is 0 to 15 times or more.

After the dome 61 is formed in this manner, an arc is generated between the welding electrode 18 and the welded portion 58 to start underwater welding.

At this time, by injecting the shield gas 29 from the gas supply source 28 to the weld 58 in the dome 61 through the shield gas supply pipe 27, the shield gas supply passage 24, and the shield gas nozzle 25, Try to prevent oxidation.

In addition, the welding wire 56 from the wire feeding device 55 is connected to the wire guide 51 of the TIG welding torch 6,
By feeding the welded portion 58 in the dome 61 via 52, a necessary build-up amount can be secured.

When the underwater welding is started in this way, a multi-joint robot 5 is operated by a welding control device (not shown) based on the data such as the position of the fillet weld portion with respect to the pipe 3 which has been measured in advance to perform TIG welding. By moving the torch 6, the fillet weld is welded underwater over the entire circumference.

As described above, according to the present invention, the water 1 is locally forced by directly injecting the dome-forming water 49 and the dome-forming gas 42 into the welding portion 58 separately from the shield gas 29. Since the dome 61 having no water 1 can be formed around the welded portion 58 by draining the water, it is possible to easily perform high-quality underwater welding without using a chamber or the like.

Further, by adjusting the pressure and amount of the dome forming water 49 and the dome forming gas 42, the water depth 20
Underwater welding can also be performed on the welded portion 58 having a depth of 0 m to 300 m or more.

The underwater TIG welding apparatus of the present invention is not limited to the above-mentioned embodiment, and the underwater TIG welding apparatus can adopt various configurations other than the illustrated example. Needless to say, various changes can be made without departing from the scope of the present invention.

[0038]

According to the present invention described above, it is possible to obtain an excellent effect that high-quality welding results can be obtained by freely performing underwater welding with a simple structure.

[Brief description of the drawings]

FIG. 1 is an overall schematic side view showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the TIG welding torch of FIG.

3 is a partially enlarged side sectional view of the TIG welding torch viewed from a phase different from that of FIG. 2, and is a view of FIG. 4 viewed from the III direction.

4 is a view taken in the direction of arrows IV-IV in FIG. 2;

FIG. 5 is a view taken in the direction of arrows VV in FIG. 2;

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 2;

[Explanation of symbols]

 1 Water 30 TIG welding torch main body 42 Dome forming gas 43 Dome forming gas injection nozzle 46 Dome forming water injection nozzle 49 Dome forming water 57 Work 61 Dome

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuyuki Tsuchiya No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Ltd. Technical Research Institute

Claims (1)

[Claims] 1. In a submersible TIG welding apparatus in which a submerged work is submerged by a TIG welding torch body immersed in water, a dome-forming gas can be injected toward the work on the outer periphery of the TIG welding torch body. An underwater TIG welding apparatus, characterized in that a dome-forming gas injection nozzle is provided, and a dome-forming water injection nozzle capable of injecting dome-forming water toward the workpiece is provided on the outer periphery of the dome formation gas injection nozzle.