CN-121972846-A - Nuclear power gas collecting header dense connecting pipe welding deformation preventing device and welding method

CN121972846ACN 121972846 ACN121972846 ACN 121972846ACN-121972846-A

Abstract

The invention discloses a nuclear power gas collecting header dense connecting pipe welding deformation preventing device which comprises a deformation preventing ring, a door-shaped support and a connecting pipe connecting cover, wherein the deformation preventing ring is fixed on a welded box bottom and a box body with rib plates at the bottom to provide support for the door-shaped support, the door-shaped support is provided with a plurality of door-shaped supports, the door-shaped supports are in one-to-one correspondence with the connecting pipes, the door-shaped supports are all fixed on the deformation preventing ring, one end of the connecting pipe connecting cover is fixed on the door-shaped support, and the other end of the connecting pipe connecting cover is fixedly connected with the connecting pipes. The device disclosed by the invention can provide good anti-deformation stress for welding the connecting pipe and can directly offset the thermal shrinkage stress on the welding seam of the connecting pipe and the cylinder body.

Inventors

LU YANG
ZHUANG SIMING
ZHANG HUI
LI JIN
LIU HAN
ZHANG JIANLEI
PAN HAIQUAN
GUO HONGBO

Assignees

哈电集团（秦皇岛）重型装备有限公司

Dates

Publication Date: 20260505
Application Date: 20251208

Claims (10)

1. The nuclear power gas collecting header dense connecting pipe welding deformation preventing device comprises a welded tank bottom (53), a tank body (52) with a bottom rib plate (55), and connecting pipes (51) and a tank cover (54) to be welded on the tank body (52), and is characterized by comprising a deformation preventing ring (1), a door-shaped bracket (2) and a connecting pipe connecting cover (3), The deformation-preventing ring (1) is fixed on a box body (52) of the welded box bottom (53) and the bottom rib plate (55) to provide support for the door-shaped bracket (2); The door-shaped supports (2) are multiple and correspond to the connecting pipes (51) one by one, the door-shaped supports (2) are fixed on the anti-deformation ring (1), one end of the connecting pipe connecting cover (3) is fixed on the door-shaped supports (2), and the other end of the connecting pipe connecting cover is fixedly connected with the connecting pipes (51).
2. The nuclear power gas collecting header dense pipe welding deformation preventing device according to claim 1, wherein, The deformation-preventing device also comprises a tensioning screw rod (4) connected with the plurality of door-shaped brackets (2) or the connecting pipe connecting cover (3).
3. The nuclear power gas collecting header dense pipe welding deformation preventing device according to claim 1, wherein, The anti-deformation ring (1) comprises a ring plate (11) and a plurality of connecting seats (12) fixed on the ring plate (11), The circular ring plates (11) are arranged on the side walls of the box body (52) close to the upper end face, the connecting seats (12) are in one-to-one correspondence with the connecting pipes (51) and are located above the connecting pipes (51) to be welded.
4. The nuclear power gas collecting header dense pipe welding deformation preventing device according to claim 1, wherein, The door-shaped bracket (2) comprises a C-shaped door-shaped plate (21) and a supporting seat (22) arranged on the door-shaped plate (21), wherein the supporting seat (22) is used for fixing the connecting pipe connecting cover (3).
5. The nuclear power gas collecting header dense pipe welding deformation preventing device according to claim 4, wherein, The lower end of the door-shaped plate (21) is provided with an arc-shaped base plate (23), and the arc-shaped base plate (23) has the same radian as the outer diameter of the box body (52).
6. The nuclear power gas collecting header dense pipe welding deformation preventing device according to claim 1, wherein, The connecting pipe connecting cover (3) is in flange connection with the connecting pipe (51).
7. A nuclear power gas collecting header dense connecting pipe welding deformation-preventing welding method, which is carried out by adopting the nuclear power gas collecting header dense connecting pipe welding deformation-preventing device according to one of claims 1-6, and is characterized by comprising the following steps: s1, welding a welded box bottom and a bottom rib plate on a box body; s2, installing the anti-deformation ring on the box body; S3, arranging the connecting pipe at a proper position, and performing ring spot welding on the root of the connecting pipe groove to fix the connecting pipe on the box body; s4, installing a connecting pipe connecting cover on the connecting pipe, installing a door-shaped bracket on the anti-deformation ring, and fixing the connecting pipe connecting cover and the door-shaped bracket; S5, welding between the connecting pipe and the box body is completed; S6, welding the box cover to the box body; S7, removing the deformation preventing device.
8. The nuclear power gas collecting header dense joint pipe welding deformation-preventing welding method according to claim 1, wherein, S5 comprises the following substeps: s51, placing the end part of the box body downwards and supporting the box body on the deformation-preventing ring by using a stand column, wherein the height is adjusted to meet the requirement of inner-side multi-person welding connection pipes; S52, welding a connecting pipe and a first layer of welding bead of the box body, and then pre-tightening a screw connecting nut of the door-shaped bracket and the connecting cover again; s53, performing water spray cooling on the back surface of the welding seam at the outer side of the box body in the welding process in a welding mode for connecting the welding seam of the 2 th layer to the 4 th layer.
9. The nuclear power gas collecting header dense joint pipe welding deformation-preventing welding method according to claim 8, wherein, In S51, two or four persons are adopted to symmetrically weld the connecting pipes, and the welding sequence of the connecting pipes adopts a space welding machine mode.
10. The nuclear power gas collecting header dense joint pipe welding deformation-preventing welding method according to claim 8, wherein, And S53, adopting cooling water to spray water for cooling, wherein the flow rate of the cooling water is not less than 4L/min, and the temperature of each group of pipes after welding is reduced to below 40 ℃ and then the next group of pipes is welded.

Description

Nuclear power gas collecting header dense connecting pipe welding deformation preventing device and welding method Technical Field The invention relates to a nuclear power gas collecting header dense connecting pipe welding deformation preventing device, in particular to a gas collecting header dense arrangement pipeline welding deformation preventing device and a welding method in a nuclear power high-temperature gas cooled reactor steam generator, and belongs to the technical field of welding. Background The high-temperature gas cooled reactor is an advanced fourth generation nuclear power technology in the world at present, the steam generator is an important heat exchange device in a unit, heat in the nuclear reactor is circularly transferred by taking helium as a heat transfer medium in the steam generator during operation, a large fan is arranged at the upper end in the device for pumping circulation, and helium is collected and conveyed to the fan through a gas collecting header and fourteen gas guide pipes. The gas collecting header structurally has important helium collecting and guiding conveying functions and is mainly formed by welding fourteen connecting pipes, a box body, a box bottom, a box cover and bottom rib plates, and the connecting pipes are connected with an external gas guide pipeline in a sealing mode through flanges. In order to ensure the connection accuracy of all the connecting pipes, the angles of all the connecting pipes of the gas collecting header and the distance from the flange end face to the center of the header are strictly required, the angle deviation is controlled within 0.5 degrees, and the tolerance of the distance L between the flange of the connecting pipe and the center of the header is controlled within 2 mm. In order to ensure the strength among all welding parts of the header during high-temperature operation, the connecting pipe and the welding seam of the box body are arranged on the inner side and require the groove to be processed for filling and welding, and the box cover cannot be installed before the connecting pipe is welded from the structure. The mounting sequence of each part of the gas collecting header comprises the steps of firstly welding the bottom of the header with the header body, welding a bottom rib plate on the inner side of the header body, then processing a connecting pipe mounting hole and an inner side welding groove on the header body, mounting and welding fourteen connecting pipes, and finally mounting the header cover and the header body, and welding the outer side of the header body to finish the manufacturing of the header. The rigidity of the lower side of the box body is better after the box body is welded with the box bottom and the bottom rib plates, but the diameters of the connecting pipe holes are larger, fourteen connecting pipes are distributed on two sides of the box body, the interval arrangement is compact, the minimum interval between the wall holes of the box body is only 38mm after the connecting pipe holes are processed on the box body, and the strength of the box body is greatly reduced. The full filled surface of the welding groove of the connecting pipe is flush with the inner wall of the cylinder body, and the welding filling quantity is large. The welding heat output of each layer is gradually increased along with the gradual increase of the filling width of the groove, so that the welding area of the connecting pipe at the top end of the box is contracted inwards to reduce the diameter, the distance from the flange of the connecting pipe to the center is reduced, the connecting pipe of the gas collecting header cannot be normally connected with the gas guide pipe, and the joint of the box cover and the box cannot be installed normally due to dislocation. In view of the foregoing, there is a great difficulty in controlling the welding deformation of the gas collecting header connection pipe, and there is a need for a device and a control method for suppressing the welding deformation and shrinkage of the gas collecting header connection pipe. Disclosure of Invention The present inventors have conducted intensive studies in order to overcome the above problems, and devised a nuclear power gas collecting header dense pipe welding deformation preventing apparatus comprising a tank body 52 to which a tank bottom 53, a bottom rib 55 are welded, and a pipe 51 and a tank cover 54 to be welded to the tank body 52, characterized in that the deformation preventing apparatus comprises a deformation preventing ring 1, a portal frame 2, a pipe connecting cover 3, wherein, The deformation-preventing ring 1 is fixed on the box body 52 of the welded box bottom 53 and the bottom rib plate 55 to provide support for the door-shaped bracket 2; The door-shaped supports 2 are provided with a plurality of connecting pipes 51 in one-to-one correspondence, the plurality of door-shaped supports 2 are fixed on the anti-deformation ring