JPH0457432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for efficiently circumferentially welding abutted portions of pipe materials whose joint end surfaces are abutted against each other, and an apparatus capable of realizing this method.

<Prior Art> When a plurality of pipes are joined together to make them longer, the joining end surfaces of the pipes to be connected are abutted against each other and the abutted portions are welded circumferentially.

As an automatic welding device for such pipe circumference welding, one having an appearance as shown in FIG. 5 is known. That is, a set screw member 15 having a presser block 14 at the tip is screwed into one of a pair of support rings 13 which are connected in an annular manner so as to surround the pipe member 12 via a connecting fitting 11. By screwing in the support rings 15, the pair of connected support rings 13 can be fixed at any position on the tube 12. A pair of rotating tubes 16 each having a semi-cylindrical shape are rotatably engaged with the upper ends of these support rings 13 so as to be concentric with the tube material 12,
The rotary cylinders 16 are designed to function as one cylinder, and a drive motor 1 attached to the other support ring 13 is attached to the outer periphery of the rotating cylinders 16 located inside the support ring 13.
A worm wheel 18 that meshes with a worm 7 (not shown) is carved. An arc length control device (hereinafter referred to as AVC) 21 that supports the TIG welding torch 19 via a control arm 20 is fixed at the upper end of one of the pair of rotating tubes 16.
The attitude of the TIG welding torch 19 can be finely adjusted by operating an adjustment handle 23 of a torch fine adjustment device 22 attached to the tip of a control arm 20. A filler wire tip 2 is connected to this TIG welding torch 19 via a bracket 24.
5 is held, and the filler wire 29 is fed from the filler wire reel 28 via the conduit cable hose 27 to the filler wire tip 25 by the operation of the filler wire feeding device 26 installed on the other support ring 13. will be sent. Note that a cab tire hose 30 for power supply and a gas hose 31 for shielding gas supply are connected to the TIG welding torch 19, and a control cable hose 32 for power and signals is connected to the AVC 21. The hose 32 also serves as power and signal to the drive motor 17. Fork,
These hoses 27, 30-32 are connected to the other support ring 1
The cable pinch rollers 33 are held between a pair of cable pinch rollers 33 that are rotatably supported by the cable pinch rollers 33, and are extended or retracted in an aligned state as the rotating tube 16 rotates.

<Problems to be Solved by the Invention> The conventional tube circumference welding device shown in Figure 5 is heavy and may damage the TIG welding torch, etc. if special care is not taken when attaching or detaching it to the tube material. There was a lot of danger that this would happen. Moreover, the butt part of the pipe material
Because it is necessary to accurately oppose the TIG welding torch, the entire device is slid along the pipe material after operating the connecting fittings, positioned, and the set screw member is screwed in to fix the support ring to the pipe material. Combined with the large overall weight, it takes a lot of time to set up the equipment, and especially in areas where there are many pipes, it takes time to position the equipment relative to the pipes, which significantly reduces work efficiency. bring about.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional pipe circumference welding apparatus, it is an object of the present invention to provide a method for efficiently circumferentially welding butt portions of pipe materials, and a welding apparatus capable of realizing this method. .

<Means for Solving the Problems> The pipe circumferential welding method of the present invention provides a method for circumferentially welding the butt portions of a plurality of pairs of pipe materials that are positioned with their joining end surfaces abutting each other. A positioning ring for accurately opposing the welding torch and the welding torch is attached in advance to the pair of pipe materials to be welded next, and a welding device is mounted on this positioning ring to sequentially weld the plurality of pairs of pipe materials. The butt portions of the two are welded together.

Further, the tube circumferential welding method of the present invention includes two halves that are connected in an annular manner so as to surround one of a pair of tube materials whose joint end surfaces are abutted against each other, and that are detachable from each other. a pair of positioning rings having an arcuate shape, a fixing means that is attached to at least one of the pair of positioning rings and capable of fixing the pair of positioning rings in a connected state to the one pipe material; a pair of support rings that are connected in an annular manner so as to surround the tubes, are placed on the pair of positioning rings, and are removable from the one of the tubes; A pair of rotating tubes each having a semicircular arc shape that can be rotatably engaged concentrically with a tube material, and a rotating tube driving means that is assembled to one of the pair of support rings and drives and rotates the pair of rotating tubes. and a welding torch attached to one of the pair of rotating tubes and facing the abutting portion of the pair of tubes.

<Operation> First, a pair of positioning rings are opposed to each other with one of the pipe materials of a pair of pipe materials whose joint end surfaces are abutted against each other, and these positioning rings are connected to each other and fitted onto the pipe material by a fixing means. After the support ring is placed in place, the pair of support rings are opposed to each other with the tube located directly above the positioning ring interposed therebetween, and they are connected to each other and placed on the positioning ring. At this time, it is necessary to accurately set the vertical position of the positioning ring relative to the abutting part so that the welding torch supported by the rotating tube of the support ring accurately faces the abutting part of the pipe material.

Thereafter, the rotating tube is rotated around the tube by the rotating tube driving means, and the butt portions of the tube are butt-welded by a welding torch attached to the rotating tube. In addition, if there is a butt part of another pipe material to be welded separately, prepare one or more pairs of positioning rings, and fit the positioning rings to the other pipe material during this welding work. Immediately after this welding work is completed, the support ring is attached to the new pipe material, and circumferential welding of the pipe materials is performed one after another.

<Example> As shown in FIG. 1, which shows the external appearance of an example of the pipe circumference welding device according to the present invention, the device of this example has a fifth pipe circumference welding device.
This is a partially improved version of the conventional pipe circumference welding device shown in the figure, and has almost the same structure. Therefore, only the different parts will be explained, and other parts will be designated with the same symbols as the conventional one. The explanation will be omitted.

One of the pair of positioning rings 35 connected annularly to surround the pipe 12 via the connecting fitting 34 is provided with a set screw member 36 that can fix the connected positioning rings 35 at any position on the pipe 12. By screwing in this set screw member 36 and pressing it against the outer peripheral surface of the tube 12, the positioning ring 35 is fixed to the tube 12 by the reaction force. Note that in this embodiment, the set screw member 36
Although the positioning rings 35 are fixed to the pipe material 12 using the connecting fittings 34, it is also possible to perform a tightening operation on the pipe material 12 by the pair of positioning rings 35 using only the connecting fittings 34, and thereby perform the positioning and fixing. be.

The pair of support rings 13 connected in an annular manner surrounding the pipe member 12 via the connecting fittings 11 are mounted on the upper end of the positioning ring 35, so that the position of the positioning ring 35 depends on the position of the positioning ring 35. The position of the TIG welding torch 19 facing the butt portion of the tube material 12 can be adjusted as desired.

Therefore, as shown in FIGS. 2 to 4 showing the work procedure according to this embodiment, first the pair of positioning rings 3 are
5 is fitted and fixed onto one of the pipe members 12 (see Fig. 2), but naturally, when the support ring 13 is mounted on these positioning rings 35, the TIG welding torch 1
It is desirable to set the position of the positioning ring 35 with respect to the tube material 12 using a jig such as a gauge so that the positioning ring 9 accurately faces the abutting portion 37 of the tube material 12. Next, after placing the support ring 13 on the positioning ring 35, the drive motor 17 is rotated in the normal direction to drive the rotating tube 16 to rotate one or more rotations, and a pair of cable pinch rollers 33 rotate in synchronization with the rotating tube 16. The hoses 27, 30 to 32 are retracted into the rotating tube 16 and wound around the tube material 12 one or more times. Then, the drive motor 17 is reversed to drive the rotating tube 16 and the cable pinch roller 33 in the opposite direction, and at the same time, the filler wire feeding device 26 feeds the filler wire 29 from the filler wire reel 28 via the conduit cable hose 27. At the same time, the power supplied through the cab tire hose 30 causes TIG
An arc is generated between the welding torch 19 and the butt portion 37 of the pipe material 12, and shielding gas is jetted from the TIG welding torch 19 via the gas hose 31 to perform butt welding of the butt portion 37 ( (See Figure 3). In this case, the positional deviation of the arc with respect to the butt portion 37 is adjusted by operating the adjustment handle 23 via the torch fine adjustment device 22, and the arc length is automatically adjusted by the AVC 21, so that Automatic circumferential welding is performed.

When there are a large number of pipe materials 12 to be welded, positioning rings 35 are attached to the remaining pipe materials 12 prior to welding or during this welding operation. Then, the support ring 13 is removed from the pipe material 12 that has been welded by rotating the rotating cylinder 16 once in the opposite direction, and this support ring 13 is attached to the next pipe material 1 to be welded.
2 and repeat the above-mentioned procedure to sequentially weld the abutting portions 37.

In this embodiment, the pair of positioning rings 35 are rotatably connected to each other by a hinge 38, but it is also possible to separate them by a pair of connecting members 34, and similarly, the support ring 13 itself can be separated. The structure can also be the same. Further, in this embodiment, the case where the pipe material 12 is vertical has been described, but the present invention can also be applied to a case where the pipe material 12 is positioned horizontally as long as the connection state of the support ring 13 to the positioning ring 35 is reliable. is possible.

<Effects of the Invention> According to the pipe circumference welding method and pipe circumference welding device of the present invention, a positioning ring is attached to the pipe material in advance, and a support ring to which a welding device is assembled is mounted on the positioning ring. Therefore, it has become possible to efficiently perform circumferential welding of the butt portions of the pipe materials.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of an embodiment of the pipe circumference welding device according to the present invention, Figs. 2 to 4 are work process diagrams thereof, and Fig. 5 is a perspective view showing the external appearance of an example of the conventional pipe circumference welding device. It is a diagram. In addition, the symbols 11 and 34 in the figure are connecting members, and 12
1 is a tube material, 13 is a support ring, 16 is a rotating cylinder, 17 is a drive motor, 19 is a TIG welding torch, 35 is a positioning ring, 36 is a set screw member, 37 is a butt part, 3
8 is a hinge.

Claims (1)

[Scope of Claims] 1. A method for precisely opposing the butt portions and a welding torch when circumferentially welding the butt portions of a plurality of pairs of pipe materials positioned with their joint end surfaces abutting each other. A positioning ring is attached in advance to the pair of pipe materials to be welded next,
A pipe circumference welding method characterized in that a welding device is mounted on the positioning ring to sequentially weld the abutting portions of the plurality of pairs of pipe materials. 2. A pair of semicircular positioning rings connected in an annular manner so as to surround one of the pair of tube materials whose joint end surfaces abut each other, and each having a semicircular arc shape that can be attached to and detached from the one tube material; a fixing means capable of fixing the pair of positioning rings attached to at least one of the pair of positioning rings in a connected state to the one pipe member; a pair of support rings that are placed on the pair of positioning rings and are removable from the one of the tubes; a pair of rotating tubes each having a semicircular arc shape, a rotating tube driving means assembled to one of the pair of support rings to drive and rotate the pair of rotating tubes, and one of the pair of rotating tubes. A pipe circumference welding device comprising a welding torch attached to one end and facing the abutted portion of the pair of pipe materials.