JPS6341679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe welding method and apparatus.

When welding piping, for example piping for a nuclear power plant, conventionally, as shown in FIG. are welded at three to four locations on the outer periphery of the temporary plate 3, and both ends of the pipes 1 and 2 are restrained via fasteners 4 attached to each temporary plate 3. Then, as shown in FIG. 2, a plurality of spacer blocks 5 are spot-welded in the circumferential direction of the grooves that are the welded joints of both pipes 1 and 2.
Thereafter, welding is performed along the groove portion, and the temporary plate 3 and spacer block 5 described above are completely removed after the actual welding. Therefore, according to this type of welding method that has been conventionally performed, temporary welding work of the temporary plate 3 and spacer block 5, removal work of the above-mentioned members 3 and 5 after the actual welding, and removal of the temporary welded parts are required. Not only does the grinding work require a lot of time and effort, but it is undeniable that the pipes 1 and 2 are affected by heat due to the temporary welding of the members 3 and 5.

The present invention has been made in consideration of the above points, and its purpose is to simultaneously improve the efficiency of work required for pipe welding and improve the reliability of pipe materials. Furthermore, the present invention aims to provide an economical pipe welding method and apparatus.

In order to achieve the above object, the present invention provides a pipe welding method for welding and connecting one pipe end to another pipe end, in which a support member for pressing a spacer block is detachably attached to the outer periphery near the first pipe end. A plurality of spacer blocks are attached to the welded joints of both pipes in the circumferential direction of the grooves, which are the welded joints, and are pressed inward through the fasteners attached to the support member for pressing the spacer blocks. The first feature is that at the same time as the grooves are aligned, both pipes are fixed together, and then welding is performed along the grooves. The present invention also provides a device for carrying out the above-mentioned welding method, which includes a support ring for pressing a half-split spacer block that is detachably attached to the outer periphery of one of the pipes via a fastener;
It is made by combining a plurality of spacer blocks that are pressed inward of the pipe through a fastener attached to the support ring for pressing the spacer block, and simultaneously align the groove of the weld joint and fix the pipe. This is the second feature.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIGS. 3 and 4. In FIG. 3, reference numeral 6 indicates a support ring for pressing a spacer block which is divided into two parts, and one half member 6a and the other half member 6b are attached to the outer periphery of the pipe 1 near the end with a fastener 7 interposed therebetween. It is removably attached. Furthermore, arms 8 are protruded from a plurality of locations in the circumferential direction of the half members 6a and 6b constituting the spacer block pressing support ring 6.
As shown in FIG. 4, a fastener 9 is attached to the holder. Thus, a plurality of spacer blocks 10 are arranged in the circumferential direction of the groove, which is the weld joint, and each block 10 is inserted into the pipe through a fastener 9 attached to the arm 8. Being pressed. That is, each block 10 is pressed inward of the pipe via the fastener 9 attached to the arm 8, thereby aligning the grooves of the weld joint and fixing both the pipes 1 and 2 together. In this state, welding can be performed along the groove portion.

As described above, according to the pipe welding method of the present invention,
A spacer block 10 disposed in the circumferential direction of the grooves, which are the welded joints of both pipes 1 and 2, is pressed inward through the pipes 9, aligning the grooves of the welded joints, and Since both pipes 1 and 2 are to be fixed integrally, the temporary plate 3 and the spacer block 5 are temporarily welded as in the conventional method shown in FIGS. 1 and 2 before the main welding of the groove part. It's not what you need. Therefore, according to the pipe welding method of the present invention, the temporary welding work of temporary plates and spacer blocks that has been conventionally performed, the removal work of the above-mentioned members after main welding, and the grinding work of the parts removed by temporary welding can be eliminated. Not only can this be omitted, but the pipes 1 and 2 will not be affected by heat due to the temporary welding of the temporary plate and spacer block, which eliminates the amount of heat input from welding other than the actual welding, and eliminates the occurrence of pipe distortion due to heating. can be kept as small as possible.

In addition, in the pipe welding device according to the present invention, since the support member for pressing the spacer block is constituted by the support ring 6 for pressing the spacer block in half, the attachment and detachment of each of the half members 6a and 6b is easy from both sides of the outer periphery of the pipe 1. It was carried out in 10 spacer blocks.
Similarly to the block pressing support ring 6, the piping 1, 2
Unlike conventional spacer blocks and temporary plates that are temporarily welded to pipes, they are not discarded after actual welding, and can be used repeatedly and economically. It is.

As described above in detail, according to the present invention, a method and apparatus for welding pipes that can simultaneously improve the efficiency of work required for pipe welding and improve the reliability of pipe materials, and that are also highly economical. can be provided.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining a conventional example of a pipe welding method, FIG. 3 is a diagram for explaining an embodiment of a pipe welding method and apparatus according to the present invention, and FIG. 4 is a diagram for explaining a conventional example of a pipe welding method. It is a partially enlarged view in the direction of arrows. 1 and 2...Piping, 6...Support ring for pressing spacer block, 6a and 6b...Half member, 7
... Fastener, 8 ... Arm, 9 ... Fastener, 10
...Space block.

Claims (1)

[Scope of Claims] 1. In a pipe welding method for welding and connecting one pipe end to another pipe end, a spacer block pressing support member is detachably attached to the outer periphery of the first pipe near the end, and Place multiple spacer blocks in the circumferential direction of the grooves that are the welded joints of both pipes.
Press the spacer block inward through the fastener attached to the support member to align the groove of the welded joint, fix both pipes together, and then press along the groove. A piping welding method characterized by welding with a pipe. 2. A support ring for pressing a half-split spacer block that is removably attached to the outer periphery near the end of one pipe via a fastener, and a fastener attached to the support ring for pressing the spacer block. A pipe welding device characterized by a combination of a plurality of spacer blocks that are pressed in a direction to simultaneously align the grooves of a weld joint and fix the pipe.