JPS6016315B2 - Underwater welding torch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a welding torch for underwater welding equipment, and with particular emphasis on expanding applications and improving operability, the underwater welding torch is made smaller and lighter, and is capable of automatic and semi-automatic welding. The present invention relates to an underwater welding torch that can be used for both underwater and medium (land) welding.

Now, for reference, the principle of "local dry underwater welding", which is one of the known underwater welding methods to which the present invention is applied, will be briefly explained.

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

That is, a high-speed liquid jet 2 is passed through the liquid counterfeit nozzle 1.
is ejected in a radial outward direction to form a water curtain around the entire circumference of the liquid ejection nozzle 1, and the water inside and outside the torch is shredded by the flow at this time. , a suction action (asvilator action) occurs from the inside of the liquid jet nozzle 1 in a radial outward direction.
In this state, by feeding the welding shield gas 4 from inside the liquid jet nozzle 1, a stable gas phase castle 5 (local cavity) is formed inside the liquid jet nozzle 1 as shown in Fig. 2, and power is supplied. This method performs welding underwater by generating a welding arc 8 between the welding core wire 7 fed through the tip 6 and the workpiece 3 to be welded. A submersible underwater welding apparatus to which the above-mentioned underwater welding method is applied will be briefly explained with reference to FIG. In the figure, 9 is a watertight container, 10 is a wire feeding device housed in this watertight container 9 and draws out the welding core wire 7 from a wire reel 11, 12 is a submersible pump attached to the outer surface of the watertight container 9; A torch for underwater welding is located on the core of the feeding device 10 and is directly attached to the watertight container 9, 14 is a water pipe that feeds a high-speed water jet from the submersible pump 12 to the torch for underwater welding 13, and 15 is a welding pipe. This is an operation switch that can be operated at hand.

Reference numeral 16 denotes a position adjustment device mounted on the traveling trolley 17. In addition, 18 is a welding cable, 19 is a control cable, a gas hose for supplying shielding gas, and a work boat 21 is connected to the floating device. It consists of a control device 22 and a shield gas supply device 23 installed at the same time. Next, the operation will be explained.

Position adjustment device 16 for aiming position of underwater welding torch 13
After adjusting the operation switch 1 attached to the watertight container 9,
5 to start welding, a high-speed water jet is sent from the submersible pump 12 to the underwater welding torch 13 through the water pipe 14, and shielding gas is supplied from the shielding gas supply device 23 on the work boat 21 to the rubber hose 20. The water is supplied to the underwater welding torch 13 through the pipe. After the gas phase castle formation time has elapsed, the wire feeding device 10 operates to feed the welding core wire 7 to the underwater welding torch 13, and the welding arc starts and the traveling trolley 17
runs. In addition, in the "local dry underwater melt saddle method" explained in Fig. 1, "high-speed liquid jet" is used to form the gas phase region, but this conventional device uses "high-speed water jet" which is one of the "high-speed liquid jets". Water is taken in by a submersible pump 12.

The attached device is constructed as described above, and when underwater, it becomes light due to buoyancy and can be carried underwater by a diving welder, but on land it is extremely difficult to use because it is equipped with a submersible pump and a wire feeding device. It is heavy and cannot be easily carried.

In addition, since the shielding gas is supplied from the water jet nozzle side, the water jet nozzle remains attached even when performing aerial welding, and spatter is likely to adhere to the water jet nozzle nozzle. Not only is it almost impractical for welding, but since two paths are required inside the water jet nozzle for gas and water, the outside diameter of the water jet nozzle is inevitably large, making it impossible to see the welded area. was there. This invention was made in order to eliminate the drawbacks of the above-mentioned conventional devices, and it separates devices with welding functions other than the welding torch from the welding torch, and also separates the nozzle part of the welding torch from the liquid jet nozzle. Underwater welding enables automatic/semi-automatic welding as well as underwater/air welding by making the nozzle replaceable with the nozzle used in semi-automatic welding torches, and by minimizing the diameter of the liquid jet nozzle. The purpose is to provide a torch for use.

An embodiment of the present invention will be described below with reference to the drawings. Fourth
In the figure, the inner nozzle la is made of glass and is screwed into the inner nozzle adapter 24a having a packing 37, and the outer nozzle lb is made of glass and is screwed into the outer nozzle adapter 24b by concentric screws of the nozzle or adapter. The inner nozzle adapter 24a has an orifice 25 sandwiched between it and the end surface of the torch body 27, and a ring 26 is interposed between the inner nozzle adapter 24a and the outer peripheral surface of the torch body 27 to seal water. In the state
A female threaded portion formed on the inner peripheral surface of the adapter 24a,
It is screwed and fixed to the torch body 27 by screwing into a male thread formed on the outer peripheral surface of the torch body 27. Further, the outer nozzle adapter 24b is
The female thread formed on the inner circumferential surface of b is screwed into the male thread formed on the outer circumferential surface of the inner nozzle adapter 24a, and the ring nut 28 is screwed into the male thread formed on the outer circumferential surface of the inner nozzle adapter 24a. By supporting the upper end surface of the nozzle adapter 24b, it is fixed to the inner nozzle adapter 24a using a double nut method.

The barrel 29 has a conduit cable 30 and a gas hose 2
0 is connected, stored in the torch body 27, and sealed with a cap 31. This conduit cable 30 consists of a welding power supply cable and a conduit tube for feeding the welding core wire 7 (not shown as it is publicly known) and is connected to a wire feeding device (not shown) installed underwater or on the water.

On the other hand, the gas hose is connected to a shield gas supply device installed on the water, as in the past. V supplied from the liquid jet nozzle
A gas phase region is formed inside the liquid jet nozzle 1 by the supplied high-speed liquid jet 2 and the shielding gas 4 supplied from the gas discharge port 32 through the inside of the gun barrel 29.

The welding core wire 7 is connected to the gun barrel 29 from the conduit cable 301.
and is supplied from the power supply tip 6 to the material to be welded 3,
Welding arc 8 in the gas phase castle 5 in the above shielding gas 4 atmosphere
Welding is performed underwater by generating .

The formation conditions of this gas phase castle 5 are influenced by many factors such as the welding posture, the flow rate and velocity of the high-speed liquid jet, and the diameter of the liquid jet nozzle (outer diameter of the nozzle). In a welding torch, in order to adjust the flow velocity of the high-speed liquid jet 2, concentric screws are provided on both the inner nozzle adapter 24a and the outer nozzle adapter 24b, and the outer nozzle adapter 24b is turned to adjust the ejection gap of the liquid ejection nozzle 1. was adjusted, and a structure was adopted in which the outer nozzle adapter 24b was fixed with the ring nut 28. In addition, it has been confirmed through experiments that welding is possible even when the diameter of the liquid jetting nozzle 1 is as large as 4 mm by investigating the above-mentioned gas phase region formation conditions. This is a major improvement over the conventional nozzle diameter, which was thought to have to be somewhat large in order to stabilize cavity formation.
Nozzle diameter (outer diameter) of torch for semi-automatic welding in air
Being close to the 2W proboscis◇, the welding groove position can be monitored more accurately. FIG. 5 shows a case where the welding torch according to the present invention is used as a semi-automatic welding torch in air.

When automatic welding is performed in combination with other jigs, such as a traveling trolley, there is little need to provide a welding start switch on the welding torch, and the welding start switch is placed in a location other than the welding torch, as shown in Figure 4. For example, it can also be used in a state where it is provided on the traveling truck side. However, when carrying out semi-automatic welding while holding a welding torch in hand, whether underwater or in the air, the welding start switch 33 is attached to the torch body 27 as shown in FIG.
It is preferable to use the attachment handle 34 from the viewpoint of workability and the like.

The welding torch according to the present invention is not equipped with a submersible pump or a wire feeding device unlike conventional ones, and the nozzle is also structured so that it can be replaced depending on the usage conditions in water and in the air.
The diameter of the jet nozzle of the liquid jet nozzle 1 is made as small as possible, so that it can be used automatically, semi-automatically, underwater, and in the air.
By adding it to the main body 27, it can be easily used as a semi-automatic device either underwater or in the air.

The control cable 35 of this welding start switch 33 is preferably relayed from a wire feeding device or the like near this underwater welding torch and brought to the control device. Furthermore, in the welding torch according to the present invention, the diameter of the spout of the liquid spouting nozzle 1 is made as small as possible so that the diameter of the screw for attaching it to the torch body 27 is the same as the screw diameter of the nozzle 36 used in aerial welding. The structure is such that the nozzle 1 and the aerial nozzle 36 can be easily replaced.

As detailed above, according to the present invention, even if the welded part of a structure built underwater continues from underwater to above the water surface, other parts can be used in the air by simply replacing the nozzle. There is no need to replace the welding torch, which significantly improves welding work efficiency, and the welding torch itself can be used for any type of welding.In addition, the wire feeding device, submersible pump, etc. can be separated from the welding torch to reduce weight. As a result, in addition to automatic welding, it can also be used for semi-automatic purposes such as temporary repair by holding the welding torch in hand.

In addition, by making the liquid jet nozzle made of glass, it is possible to directly monitor the welding arc, and by reducing the diameter of the liquid jet nozzle to 4 mm, it is possible to accurately monitor the weld joint position and adjust the flow speed of the high-speed liquid jet. The effects of this, such as improving the stability of the gas phase castle, are enormous.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams explaining the principle of local dry underwater welding, which is one of the underwater welding methods, Figure 3 is a configuration diagram of a conventional underwater welding device, and Figure 4 is an underwater welding method according to an embodiment of this invention FIG. 5 is a sectional view showing a welding torch, and FIG. 5 is a front view of semi-automatic aerial welding showing another embodiment of the present invention. In the figure, 1 is a liquid jet nozzle, la is an inner nozzle,
lb is an outer nozzle, 2 is a high-speed liquid jet, 4 is a shielding gas, 7 is a welding core wire, 20 is a rubber hose, 24a is an inner nozzle adapter, 24b is an outer nozzle adapter, 27
is the torch body, 28 is the ring nut, 29 is the barrel, 30
is a conduit cable, 33 is a welding start switch, 34
is a handle, and 36 is an air nozzle. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A conduit cable and a gas hose for supplying shielding gas are connected to the welding torch barrel disposed inside the welding torch body, and a high-speed liquid jet is applied to the tip of the welding torch body. Equipped with a liquid jet nozzle that spouts out,
A high-speed liquid jet is ejected from the liquid jet nozzle, and the welding core wire sent to the inside of the liquid jet nozzle through the conduit cable and gun barrel is surrounded by the high-speed liquid jet at a predetermined distance, and the shielding gas is sent to the welding torch gun barrel. An underwater welding torch that performs welding in a space surrounded by a high-speed liquid jet by supplying the welding core wire through the inside of the welding torch, which is equipped with a handle that is detachable from the welding torch body and has a built-in welding start switch. An underwater welding torch, characterized in that the handle is attached to the welding torch body during semi-automatic welding, and the liquid jet nozzle is detachably attached to the welding torch body. 2. The underwater welding torch according to claim 1, which can be used even in the air by taking out the nozzle adapter and attaching a nozzle that is the same or equivalent to a semi-automatic welding torch commonly used on land. . 3. A patent claim characterized in that, in a nozzle adapter for attaching a liquid jet nozzle, the inner adapter and the outer adapter are both provided with concentric screws and screwed together, and the outer adapter is turned to adjust the liquid jet gap of the liquid jet nozzle. The underwater welding torch according to item 1. 4. The underwater welding torch according to claim 3, wherein the outer adapter is fixed with a ring nut. 5. An underwater welding torch according to claim 3, characterized in that the material of the liquid ejection nozzle that ejects a high-speed liquid jet is made of glass and is attached to a nozzle adapter.