JPS6020116B2 - Vertical welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical welding torch, particularly to a welding torch suitable for shortening the welding length in narrow joints such as joints of steel structures, and for vertical electrogas welding.

In recent years, the welding method for vertical butt joints such as steel structures and oil storage tanks involves moving the welding torch back and forth from the front to the back of the joint and from the back to the front to weld the steel plates vertically butt. Electrogas welding equipment that performs this process has come to be adopted.
Particularly recently, in order to improve the operability of the welding equipment and to reduce the weight of the equipment, a method has been developed in which the welding torch alone is raised to carry out welding without the use of a trolley for raising and lowering the equipment.

The present inventors have conducted various research experiments on welding equipment suitable for shortening the welding length and for narrow-gap electrogas welding, and as a result, we have developed a welding torch that is held by a roller mechanism and can be raised and lowered freely. We have developed and filed an application for a vertical electrogas welding device that includes a relay box for shielding gas through which the welding torch penetrates, a consumable gas nozzle attached to the relay box to surround the welding torch, and a vibration mechanism for the welding torch. (Tokukoshi No. 53-161209)
.

When electrogas welding is performed using this welding device, there are fewer defects in the welded part, and complex electrical control means are not required to control the vibration of the welding torch.In addition, the range of application of the device is expanded and operability is improved. Many benefits were obtained, including the ability to measure improvements. The outline of the device of the above-mentioned special face number 16120 will be explained based on FIGS. 1 and 2.
Fig. 1 shows a welding device for performing vertical electrogas welding by inserting a welding torch 5 into a joint formed by surrounding the materials 1 and 2 to be welded whose ends are butted together by a backing metal 3 and a front metal 4 made of steel plates. and shown in FIG.

In other words, the welding torch 5 is a non-consumable one made of steel or copper alloy with good electrical conductivity in the shape of a tube, and is pressurized by a roller 7 driven by a lifting motor 6 and a pressure screw 8. It is held by pressure rollers 9, passes through the gas relay box 10, is concentrically surrounded by an expendable gas nozzle 11 made of glass fiber, etc. provided at the bottom of the relay box 10, and is inserted into the joint. is set up. The base 12 holding these members is provided so as to be vibrated by a motor 13 in the direction of an arrow 14 using a sliding shaft 20 as a guide via a slider mechanism, and passes through the welding torch 5 to weld the welding part. The wire 25 supplied to the is also vibrated in the direction of the same arrow 14. Furthermore, the welding device is clamped to the workpiece 2 by screws 15, and a gas relay box 101 is fitted with a cap 16 for introducing shielding gas. Further, a clamp 24 provided in the vibrating section is used to turn a push screw 23 for stopping the vibration of the base 12 at one end. To explain the operation of the above-mentioned welding device, as the wire 25 is fed through the welding torch 5 and melted, the gas nozzle 11 is gradually consumed, the welding torch 5 is driven by the roller 7 and raised, and the welding progresses. To go.

The shielding gas taken into the gas relay box passes through the gap between the gas nozzle 11 and the welding torch 5 and shields the welding part. On the other hand, the base 12 attached to the sliding block 19 is vibrated in the direction of the arrow 14, and the welding torch 5 and gas nozzle 11 are also vibrated within the groove, distributing heat input evenly from the front to the back of the groove. At the V-type joint, screws 23 are fed as necessary to temporarily stop the vibration at the joint surface and distribute the amount of heat input corresponding to the cross-sectional area of the groove, thereby sufficiently melting the groove surface. However, the weld metal fills the weld, resulting in a sound weld with no defects such as insufficient penetration. However, in the above-mentioned vertical electrogas welding device, the vertical welding torch requires a length equivalent to at least the welding length, as well as the length of the part that is set in the torch lifting mechanism, making it a fairly long torch. At the same time, since it is inserted into a narrow joint and subjected to vibrating motion, it is required to have a narrow recess.

However, since welding torches must be made of copper or copper alloy in consideration of electrical conductivity, if the torch is long and has a diameter as described above, its rigidity becomes a problem. Since the end of the wire conduit, the wire straightening mechanism, etc. are attached to the upper part, the weight causes sag, which interferes with the wire feeding or the raising/lowering operation of the torch. Furthermore, since the tip of the welding torch is exposed to a high-temperature welding atmosphere, heat loss of the torch also becomes a problem, and an efficient cooling structure is desired.

Even if a hollow torch is simply provided with water supply and drainage ports for water cooling, the cooling water evaporates in the high temperature section at the bottom of the torch and the pressure becomes higher than the water supply pressure, preventing good cooling water circulation. The effect may not be as expected. Therefore, there is a need for a structure that can effectively cool the lower part of the welding torch even in the case of the largest welding torch. In view of the above-mentioned points, it is an object of the present invention to provide a vertical welding torch that has sufficient rigidity to maintain linearity with little deformation and is capable of strongly distributing cooling water even to the lower part of the torch. purpose.

Another object of the present invention is to provide a vertical welding torch that is effective for use in the above-mentioned vertical electrogas welding, particularly for shortening the weld tangent at narrow joints, and for use in the electrogas welding method. The present invention will be explained in detail below.

The welding torch according to the present invention can be made long, with a length of 30 m or more, and in some cases up to nearly 100 m.
Also, its diameter is approximately the same size as one gong skin.

The basic cross-sectional structure of the welding torch consists of an outer tube and a gun barrel inserted into the outer tube, with a wire insertion hole bored in the center of the barrel, and a gap between the outer tube and the gun barrel. A cooling water supply and drainage channel is formed extending in all directions of the axis. From the viewpoint of electrical conductivity, it is preferable that the welding torch of the present invention is made of copper for both the outer tube and the barrel.
If it is made entirely of copper, it will not have high rigidity, so if you want to make it the longest, it is desirable to use a steel alloy such as brass or phosphor bronze that has high mechanical properties for at least one of the outer tube and barrel, and also has good electrical conductivity. Parts that do not require much consideration can be made of iron or stainless steel. Next, embodiments of the present invention will be described based on the drawings.

FIG. 3 is a longitudinal sectional view showing a specific example of the welding torch of the present invention, in which an outer tube 31 having a circular cross section and a desired length and diameter;
A barrel 3 that is slightly longer than the outer tube 31 is inserted into the outer tube 31.
2, a power supply tip 36 attached to the tip of the barrel 32, and a water supply pipe 37 and a drainage pipe 38 disposed opposite to the rear end of the outer tube 31.

The entire periphery of the front part 32a and rear part 32b of the gun barrel 32 is closely attached to the inner periphery of the outer tube 31, and the outer tube 31 is fixed to the outer tube 31 by means such as brazing.

As shown in the figure, the front part 32a is a chip attachment part that is iron-coupled and screwed together with the rear end of the power supply chip 36, and the other rear part 32a is
b is an introduction part for wires sent through a conduit (not shown). Further, a wire insertion hole 33 is drilled through the center of the barrel 32. Furthermore, the gun barrel 32 between the front and rear parts 32a and 32b of the gun barrel 32 is
Two chambers 34 and 35 are formed extending in the axial direction between the outer pipe 31 and the cooling water passage, and these chambers 34 and 35 are connected to the water supply pipe 37, respectively.
and the drainage pipe 38.

The mouth in FIG. 4A shows an example of the configuration taken along the line A-A' in FIG. It is formed by forming.

The example shown in FIG.
Two chambers 34 and 35 are formed by inserting the two chambers 34 and 35 into the chamber. Further, the mouth shown in FIG. 4 is an example in which circular entrances, which become chambers 34 and 35, are formed on opposite sides of a gun barrel 32 having a diameter that substantially matches the inner diameter of the outer tube 31. Among these, the one having the cross-sectional structure shown in FIG. 4C is the most preferable in terms of ease of processing and the largest area in close contact with the outer tube 31, in terms of maintaining the straightness of the torch. Of course, any cross-sectional structure other than the illustrated example may be adopted as long as it can achieve the object of the present invention. Note that the chamber 34 is formed separately and independently.
As shown in FIG. 5, the cooling water supplied through the cylinders 35 and 35 serves as a cooling function and is drained at the end thereof, that is, at the front 32a side of the gun barrel 32, as shown in FIG.

Further, as for the material, as described above, copper, steel alloy, iron, stainless steel, etc. may be appropriately selected or combined.

In the present invention, as described above, the gun barrel 32 is inserted into the outer tube 31 and cooling water is supplied between them.
The barrel 32 must be in close contact with the inner surface of the gun.

Therefore, it is preferable that both the outer tube 31 and the gun barrel 32 be manufactured with high dimensional accuracy and surface finish accuracy. The use of the welding torch of the present invention constructed as above is as already described in the explanation based on FIGS. 1 and 2.

During welding, cooling water is forcibly fed into the chamber 34 from a cooling water supply source connected to the water supply pipe 37 to cool the lower part of the torch, and then the heated cooling water passes through the chamber 35 to the drainage pipe. It is taken out from 38. Also, the wire is connected to the rear part of the barrel 32.
The wire fed through the wire insertion hole 33 from b protrudes from the tip 36 at the tip and is supplied to the welding part. In addition,
As for the power supply method in the present invention, power may be supplied from the water supply piping 37 or the barrel rear part 32b. The effects obtained by the welding torch of the present invention described above are as follows.

'11 It has a double structure of the outer tube and the barrel, and the inside of the outer tube is partitioned by the barrel to form a water supply and drainage channel, so the outer tube and the barrel have close contact in all directions, and the barrel This has the effect of reinforcing the outer tube.

Therefore, even as a long torch with a pongee diameter, it has high strength and there is no risk of damage during use, making it particularly suitable as a torch for vertical electrogas welding using a narrow gap. Furthermore, since the gun barrel can be manufactured using a steel alloy with good conductivity and the outer tube can be manufactured using a high-strength steel material, it is possible to provide a torch with even higher rigidity.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing a welding device to which the welding torch of the present invention is applied, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view showing a specific example of the torch of the present invention, and FIG. 4 3 shows an example of the cross-sectional structure of the torch shown in FIG. 3, and FIG. 3 is a sectional view taken along the line A-A' in FIG. 3, and FIG. 5 is a sectional view taken along the line B--B' in FIG. 1, 2... Material to be welded, 5... Welding torch, 11... Consumable gas nozzle, 31...
・Outer tube, 32... Barrel, 33... Wire insertion hole, 34, 35... Chamber, 36... Chip, 37, 38
...Water supply and drainage piping. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 In a welding torch that is inserted into a narrow gap in a welding base material and can be pulled up in synchronization with the welding speed, there is an outer tube 31 and a wire insertion hole 33 in the center that is inserted and fixed into the outer tube.
The inside of the outer tube 31 is partitioned and separated in the axial direction by the gun barrel 32 to form chambers 34 and 35 that serve as cooling water condensation and drainage channels.
A vertical welding torch characterized by having a structure in which the two are connected at the front part 32a side of the gun barrel 32.