JPS5940545B2 - Underwater welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater welding device that performs welding underwater, and with particular emphasis on expanding the range of applications and improving operability, the underwater welding torch is made smaller and lighter, and the underwater welding apparatus is capable of performing underwater welding. The purpose is to allow technicians to freely weld.

Most of the underwater welding currently being carried out is a wet method in which a diving welder manually performs arc welding directly underwater using a coated welding rod, resulting in poor work efficiency and inferior joint performance of the welded part. Due to these drawbacks, it is mainly used for repair welding.

On the other hand, the dry method, in which the welding part is surrounded by a watertight container and carried out under the same conditions as welding on land, requires a large amount of expense because it is necessary to manufacture a watertight container that matches the shape of the welding part. Due to the current state of underwater welding technology, many underwater welding methods have been rapidly developed. Among them, the local dry underwater welding method, which has excellent performance and has put full-scale underwater welding into practical use, is the underwater welding method of the present invention. The present invention was applied to a device (hereinafter referred to as the device of the present invention).

Before entering into a detailed description of the present invention, a known local dry underwater welding method (hereinafter referred to as underwater welding method) used in the apparatus of the present invention will be explained.

FIG. 1 illustrates the principle of the underwater welding method, and FIG. 2 is a diagram of the inside of a water jet nozzle 1, which will be described later, as seen from below in FIG.

The outer cylinder of a conventional gas-shielded arc welding torch is made double, and a taper-shaped water jet nozzle 1 is provided at its tip. A high-speed water jet 2 is passed diagonally through this water jet nozzle 1.
When water is discharged in a radial outward direction and a water curtain is formed around the entire circumference of the water jet nozzle 1, the water inside and outside the torch is blocked by this jet flow, and at the same time, the narrow gap between the tip of the water jet nozzle 1 and the workpiece 3 is At this point, a suction action (aspirator action) occurs in the radial direction from inside the torch. In this state, when the welding shield gas 4 is fed from inside the water jet nozzle 1, due to the blocking action and suction action of this jet flow and the crushing action of the escaped gas bubbles, the area directly under the water jet nozzle 1 is stabilized as shown in Fig. 2. A gas phase region (local cavity) 5 is formed,
Welding is carried out underwater by generating a welding arc 8 between the welding wire 7 fed through the power supply chip 6 and the workpiece 3 in the same way as in the air in this gas atmosphere. It is. A conventional underwater welding apparatus to which the above-mentioned underwater welding method shown in FIG. 1 is applied will be briefly explained with reference to FIG. Underwater welding systems can be roughly divided into a control device above the water and a welding device underwater.The method of feeding the welding wire is to push the welding wire from the floating device to the underwater welding device when welding in a relatively shallow place. The welding wire is fed by a pull feeding method, and in cases where push/pull wire feeding control is difficult due to the depth, a method of mounting the welding wire on an underwater welding device is adopted.

The conventional underwater welding apparatus shown in FIG. 3 has a water-based control device mainly mounted on a work boat 9, a water jet pump 10, a pusher side welding wire feeder 11, a control power source for welding and a welding device. 12, a welding shield gas cylinder 13 is installed. A welding wire supply conduit tube 14, a shielding gas supply hose 15, a water jet supply hose 16, and other hoses, a welding cable 17, and a control cable 18 are connected between the floating control device and the underwater welding device. etc., are connected by cables.

The underwater welding device has a welding line 19 of the workpiece 3.
A traveling truck rail 20 is laid in parallel with the rail 20, on which a traveling truck 21 having a drive device for welding traveling runs, and a workpiece 3 to be welded is fabricated based on the underwater welding method described above on the traveling truck 21. A position adjustment drive device 23 for vertically and horizontally adjusting the position of the underwater welding torch (hereinafter referred to as underwater welding torch) 22, a pull-side welding wire feeding device 24, and the underwater welding torch 22 are provided. Although this conventional underwater welding device has the advantage of being able to weld continuously for a long time, it is necessary to install the traveling cart 21 even when welding a short welding length such as repair or tack welding. Traveling trolley 21
The underwater welding torch 22, the position adjustment drive device 23, and the pull-side welding wire feeding device 24 are integrated, and the hoses 14, 15, 16 and cables 17, 18 are connected between the surface of the water and the traveling cart 21. Because of this, when changing the welding position, it is necessary to relocate the traveling carriage 21 in which the position adjustment drive device 23 and pull-side welding wire feeding device 24 are integrated together with the underwater welding torch 22. It is difficult to rearrange the configuration (the machine is designed specifically for each welding position, so it is difficult to use it in common with other welding positions)
Since this is a method of remotely controlling the underwater welding equipment from above the water, there are many drawbacks such as difficulty in establishing communication between the underwater and surface areas during preparatory work. In order to eliminate the above-mentioned drawbacks, the present invention reduces the size and weight of an underwater welding torch, and eliminates the need for various welding jigs such as a traveling truck by allowing a diving welder to directly hold the torch in his hand while welding.

FIG. 4 is a configuration diagram showing an embodiment of the apparatus of the present invention.

The underwater welding torch 22 is lightweight and small so that welding can be carried out underwater by a diving welder.

That is, a working handle 32 is attached to the underwater welding torch 22, and the handle 32 has a built-in welding start switch 31 having a waterproof structure. By pressing the welding start switch 31, the welding wire 7 is fed from the wire feeding device 11 on the work boat 9 through the conduit tube 14. Also, a high-speed water jet 2 is jetted from the water jet pump 10 on the work boat 9 to the water jet nozzle 1 via the water pipe 33, and a shielding gas 4 is supplied between the inner surface of the water jet nozzle 1 and the gun barrel 27. . As a result, a gas phase region 5 is formed within the water jet nozzle 1. An insulator 30 holds the gun barrel 27.

In addition, the welding cable 17 connects the welding power source 12 above the water and the gun barrel 27.
connecting between. (It is known that this welding cable 17 can also be integrated with the conduit tube 14.) Also, the welding wire 7 is pulled out from the wire reel 35 on the work boat 9 by the wire feeding device 11, Guided by the Tutotube 14 and guided by the gun barrel 27,
The power is supplied from the power supply chip 6 to the workpiece 3 and welding is performed underwater by generating a welding arc 8 in the shielding gas 4 atmosphere.

As mentioned above, only the handle 32 is attached to the underwater welding torch 22, and the welding condition adjuster etc. necessary for welding operations are provided on the work boat 9, and the diving welder uses the underwater welding torch 22. I only hold it in my hand and weld it. or,
FIG. 5 shows a case in which the welding torch 22 is attached to a well-known welding jig, a vertical and horizontal position adjustment device 23, and a self-propelled traveling trolley 21 for automatic welding. It is an example figure.

The device of the present invention is easily attached and detached to the vertical and horizontal position adjustment device 23, and the device 23 allows the welding line 1 of the workpiece 3 to be
9, and the welding movement of the traveling carriage 21 is driven in synchronization with the underwater welding torch 22 of the apparatus of the present invention. Furthermore,
FIG. 6 is a diagram showing an embodiment of manual welding using the apparatus of the present invention.

As shown in the figure, 33 is a nozzle gap holder, which is fixed to the outer cylinder of the water jet nozzle 1 and is used to stably form the gas phase region 5 described in the principle of the local dry underwater welding method. This is to keep the gap A between the lower surface of the workpiece 3 and the workpiece 3 constant. This gap A is determined by the flow rates of the water jet 2 and the shielding gas 4, and serves as a gas phase region forming performance. Therefore, once the nozzle gap holder 33 is set in this gap A, there is no need to adjust it, so it may be fixed to the water jet nozzle 1 in a semi-fixed manner. As an embodiment of the device of the present invention, the water jet pump 10 and the wire feeding device 11 are installed on the work boat 9. However, as the water depth increases, the water pressure increases.
Unless the discharge performance of the water jet pump 10 is increased above this water pressure, a stable gas phase region 5 cannot be obtained, and the wire feeding capacity is also 10% if the feed control is performed only by pushing.
up to about 20 to 3 m, even in the case of push and pull.
The welding wire 7 cannot be fed more stably up to about 0 m.

Therefore, when performing welding work in deep water, it is necessary to install the water jet pump 10 and the wire feeding device 11 underwater.

FIG. 7 is an example illustrating this situation. As shown in the figure, the water jet pump 10 uses a submersible pump,
The wire feeding device 11 is housed in a watertight container 36.
As detailed above, the apparatus of the present invention has the following features. (1) A diving welder can bring the welding torch to the welding site and directly hold the underwater welding torch in his hand to weld, making it unnecessary to install a traveling cart when welding a short welding length.

(2) Underwater welding torches are lightweight, compact, and have good operability.

(3) It becomes easy to rearrange the constituent devices when changing the welding position.

(4) It can be used in various ways depending on the welding situation.

In other words, when welding short welding lengths, the torch can be held in the hand without installing a traveling trolley, and the hoses are not affected by waves or currents. During deep sea (10m or more) welding work, the wire feeder and water jet pump can be installed near the torch so that welding performance is not affected by the distance between above and below water.
Furthermore, in order to carry out welding for a long period of time, an integrated torch and traveling trolley can be used underwater, and other devices can be installed above water.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the principle of local dry underwater welding, FIG. 3 is a configuration diagram of a conventional underwater welding device, FIG. 4 is a configuration diagram of an underwater welding torch showing an embodiment of the present invention, and FIG. The figure shows an embodiment of the present invention in which the torch is combined with a traveling truck. Figure 6 shows an example of manual welding using the underwater welding torch of the present invention. Figure 7 shows an underwater water jet pump and wire feeder. This is an example in which a Note that the same reference numerals in the drawings indicate the same or equivalent parts, and in the drawings, 1 is a water jet nozzle, 3 is a workpiece to be welded, 5 is a gas phase region, and 7 is a water jet nozzle.
10 is a welding wire, 10 is a water jet pump, 11 is a push side wire feeding device, 21 is a traveling truck, 22 is an underwater welding torch, 24 is a pull side wire feeding device, 31 is a switch,
32 is a handle.

Claims (1)

[Claims] 1. An underwater welding device that performs welding while forming a gas phase region at the welding part of the workpiece by means of a water jet underwater, which has a handle equipped with a welding start switch, which is disposed opposite to the welding part. an underwater welding torch, a wire feeding device and a water jet pump disposed separately from the underwater welding torch underwater or above the water, and the underwater welding torch;
Connecting between the wire feeding device and the water jet pump,
A hose through which a welding wire or a water jet is fed, and a mounting portion that is provided on the underwater welding torch and is detachably attached to a vertical and horizontal position adjustment device of a traveling trolley that travels over the object to be welded. Underwater welding equipment.