JPH03142096A - Method for repair by backing strip - Google Patents
Method for repair by backing stripInfo
- Publication number
- JPH03142096A JPH03142096A JP1278237A JP27823789A JPH03142096A JP H03142096 A JPH03142096 A JP H03142096A JP 1278237 A JP1278237 A JP 1278237A JP 27823789 A JP27823789 A JP 27823789A JP H03142096 A JPH03142096 A JP H03142096A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- repair
- defective part
- piping
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 16
- 238000003466 welding Methods 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 230000002950 deficient Effects 0.000 claims abstract description 17
- 230000007547 defect Effects 0.000 claims description 16
- 239000007789 gas Substances 0.000 description 12
- 210000000569 greater omentum Anatomy 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、プラントの配管又は容器等に欠陥が生した場
合の応急補修に好適な当て板補修方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a patch plate repair method suitable for emergency repair when a defect occurs in plant piping, containers, etc.
プラントの配管又は容器等（以下配管類という）に生じ
た亀裂等の欠陥から管内液体の漏洩がある場合、欠陥部
分に当て板を溶接にて取付けて一時的に漏洩を阻止して
おり、従来の当て板補修方法としては、第２図（Ａ）部
分縦断正面図、（Ｂ）横断面図に示す全周当て板式と、
第３図（Ａ）縦断面図、 （Ｂ）横断面図に示す部分当
て板式とがあり、その手順は、補修管１の漏洩中の欠陥
２に全周当て板３又は部分当て板３ａを取付け、その周
囲をすみ肉溶接４で密閉する。なお全周当て板３は分割
部溶接５を施す。When liquid leaks from a defect such as a crack in a plant's piping or containers (hereinafter referred to as piping), a patch plate is welded to the defective part to temporarily prevent the leakage. The method of repairing the caul plate is the full-circumference caul plate method shown in Figure 2 (A) partial longitudinal sectional front view and (B) cross sectional view.
There is a partial patch plate method shown in FIG. 3 (A) longitudinal sectional view and (B) cross sectional view, and the procedure is to apply a full circumference patch plate 3 or a partial patch plate 3a to the leaking defect 2 in the repair pipe 1. Install and seal around it with fillet weld 4. Note that the entire circumference patch plate 3 is welded at the divided portions 5.
しかしながら、このような方法においては、第４図部分
拡大図に示すように、管内液体６が欠陥２を出口として
漏洩した場合は、補修管１と当て板３，３ａとの間にた
まり水６Ｉ！となってたまり、このたまり水６１がすみ
肉溶接４の初層溶接時に溶接熱により加熱されて水蒸気
となり、溶接アーク７に乱れを生しさせるとともに、加
熱によりすき間内圧が上昇し溶接中に溶融池の吹上げ現
象が起こり、アーク持続性を阻害して溶接作業性を極め
て悪くし、結局光て板温接部の欠陥となり溶接継手の健
全性が保てない。However, in such a method, if the liquid 6 in the pipe leaks through the defect 2 as an outlet, as shown in the partially enlarged view of FIG. ! This accumulated water 61 is heated by the welding heat during welding of the first layer of fillet welding 4 and turns into water vapor, which causes disturbances in the welding arc 7 and increases the internal pressure in the gap due to heating, causing it to melt during welding. A phenomenon of water blowing up occurs, which impedes arc sustainability and makes welding workability extremely poor.Eventually, the shine causes defects in the hot welded parts of the plates, making it impossible to maintain the integrity of the welded joint.
また管内ｌ皮体６の漏洩が多量ある場合には、当て板３
．３ａの溶接が不可能で補修ができないため、プラント
の運転を停止せざる得ないこともある。In addition, if there is a large amount of leakage from the inner skin 6 of the pipe, the patch plate 3
．． 3a cannot be welded and cannot be repaired, so plant operations may have to be stopped.
本発明は、このような事情に鑑みて提案されたもので、
配管類の欠陥部から漏洩する管内液体を阻止することが
でき、当て板の溶接作業性が大きく向上するとともに、
補修後の強度が向上しく建全な溶接継手が得られ、更に
補修工数の低減化が達成できる当て板補修方法を提供す
ることを目的とする。The present invention was proposed in view of these circumstances, and
It is possible to prevent liquid from leaking from piping defects, greatly improving the welding workability of the patch plate, and
It is an object of the present invention to provide a patch plate repair method that can improve the strength after repair, provide a sound welded joint, and further reduce the number of repair man-hours.
そのために本発明は、配管類に生じた欠陥部の外表面に
管内液体漏洩を防止する当て板をすみ肉溶接して補修す
るにあたり、上記配管類の欠陥部の外表面からガス圧に
より液体漏洩を阻止しながら同欠陥部をレーザー溶接し
たのち、その上に当て板をすみ肉溶接して取付けること
を特徴とする。To this end, the present invention aims to repair piping by fillet welding a patch plate to the outer surface of the defective part to prevent liquid leakage in the pipe, and to repair the defect by gas pressure. The feature is that the defective part is laser welded while preventing the damage, and then a patch plate is attached thereon by fillet welding.
〔作用〕
上述の手段により、配管類の欠陥部から漏洩する管内液
体を阻止することができ、当て板の溶接作業性が大きく
向上するとともに、補修後の強度が向上し健全な溶接継
手が得られ、更に補修工数の低減化が達成できる当て板
補修方法を得ることができる。[Function] By the above-mentioned means, it is possible to prevent the liquid inside the pipes from leaking from the defective parts of the pipes, and the welding workability of the patch plate is greatly improved, and the strength after repair is improved and a sound welded joint can be obtained. In addition, it is possible to obtain a caul plate repair method that can further reduce the number of repair man-hours.
本発明光て板補修方法の一実施例を第１図縦断面図につ
いて説明する。An embodiment of the shingle repair method of the present invention will be described with reference to a vertical cross-sectional view in FIG.
同図において、管内液体６漏洩中の欠陥２の外表面を取
巻く補修管１外表面に、ガス加圧によって漏洩を阻止す
るための加圧チャンバー８をガス密閉のゴムシール９を
介して取付ける。この加圧チャンバー８の頂部には、加
圧ガス１１を取入れるガス人口１０が設けられるととも
に、集光光学系１５を介して送られるレーザー光１６を
導入するための石英ガラス板１２が、０リング１３と押
さえフランジ１４により嵌着されている。In the figure, a pressurized chamber 8 for preventing leakage by pressurizing gas is attached via a gas-tight rubber seal 9 to the outer surface of the repair tube 1 surrounding the outer surface of the defect 2 where the liquid 6 inside the tube is leaking. At the top of this pressurized chamber 8, a gas port 10 for taking pressurized gas 11 is provided, and a quartz glass plate 12 for introducing laser light 16 sent via a condensing optical system 15 is provided. It is fitted by a ring 13 and a holding flange 14.
このような加圧チャンバー８を用いて欠陥２をレーザー
光１６でレーザー溶接するにあたっては、加圧ガス１１
をガス人口ｌＯから送給し、チャンバー内圧を上昇させ
ることにより欠陥２を出口として漏洩してくる液体６を
管内へ押し戻しながら、石英ガラス板１２から集光光学
系１５を介したレーザー光１６を欠陥２に照射し、漏洩
阻止の溶接部１７を形成する。この場合加圧ガス１１は
、補修管１への溶接による品質及び材質的影響を与えな
い不活性ガス等の溶接シールドガスを用いのが好ましい
。When laser welding the defect 2 with the laser beam 16 using such a pressurized chamber 8, the pressurized gas 11 is
is supplied from the gas population 10, and by increasing the chamber internal pressure, the liquid 6 leaking through the defect 2 as an outlet is pushed back into the tube, and the laser beam 16 is emitted from the quartz glass plate 12 via the condensing optical system 15. The defect 2 is irradiated to form a leak-preventing weld 17. In this case, the pressurized gas 11 is preferably a welding shielding gas such as an inert gas that does not affect the quality and material properties of the repair pipe 1 by welding.
このようにして、欠陥２の外表面にレーザー溶接による
溶接部１７を形威し、液体６の届洩を阻止したのちに、
第２図、第３図に示ｒ従来方法で施工した全周当て板３
又は部分て板３ａを、補修管ｌの外表面に当てその囲を
すみ肉ｌ容接４で取付ける。このとき液体６の漏洩はな
いので、当て板溶接時のアーク接続性は向上し、溶接作
業性及び溶接部の健全性が向上する。In this way, after forming a weld 17 by laser welding on the outer surface of the defect 2 to prevent the liquid 6 from reaching,
Figures 2 and 3 show full-circumference patch plate 3 constructed using the conventional method.
Alternatively, place the partial plate 3a on the outer surface of the repair pipe l and attach the circumference with the fillet l connection 4. At this time, since there is no leakage of the liquid 6, the arc connectivity during patch plate welding is improved, and the welding workability and the soundness of the welded part are improved.
かくして本発明の補修方法によれば、補修管１の欠陥２
から漏洩する管内液体６をガス圧により管内へ押し戻し
ながら、レーザー溶接し阻止するので、当て板３，３ａ
の溶接に関して障害がなくなり溶接作業性が大きく向上
し、また欠陥２を直接溶接したのちに当て板３，３ａを
取付けるため、補修後の強度が向上するとともに、供全
な溶接継手が得られる。従ってプラント現地補修工事に
おけるこの方法の採用による工数減は大きい。Thus, according to the repair method of the present invention, the defect 2 of the repair pipe 1 can be fixed.
Since the liquid 6 leaking from the pipe is pushed back into the pipe by gas pressure and prevented by laser welding, the backing plates 3, 3a
There is no problem with welding, and welding workability is greatly improved, and since the patch plates 3 and 3a are attached after directly welding the defect 2, the strength after repair is improved and a perfect welded joint can be obtained. Therefore, the reduction in man-hours by adopting this method during on-site plant repair work is significant.
要するに本発明によれば、配管類に生じた欠陥部の外表
面に管内液体漏洩を防止する当て板をすみ肉溶接して補
修するにあたり、上記配管類の欠陥部の外表面からガス
圧により液体漏洩を阻止しながら同欠陥部をレーザー溶
接したのち、その上に当て板をすみ肉熔接して取付ける
ことにより、配管類の欠陥部から漏洩する管内液体を阻
止することができ、当て板の溶接作業性が大きく向上す
るとともに、補修後の強度が向上し健全な溶接継手が得
られ、更に補修工数の低減化が遠戚できる当て板捕修方
法が得られるから、本発明は産業上極めて有益なもので
ある。In short, according to the present invention, when repairing a defective part of piping by fillet welding a patch plate to the outer surface of the defective part to prevent liquid leakage in the pipe, liquid is released from the outer surface of the defective part of the piping by gas pressure. By laser welding the defective part while preventing leakage, and then attaching a caul plate on top of it by fillet welding, it is possible to prevent liquid from leaking from the defective part of the piping, and welding of the caul plate is possible. The present invention is industrially extremely useful because it provides a patch plate repair method that greatly improves workability, improves the strength after repair, provides a sound welded joint, and further reduces repair man-hours. It is something.
第１図は末完明光て板補修方法の一実施例を示す縦断面
図である。
第２図は従来の当てＦｉ？！ｉ修方法を示し、同図（Ａ
）は部分縦断正面図、同図（Ｂ）は（Ａ）のＢ−Ｂに沿
った横断面図、第３図は上記とは異なる従来の当て板補
修方法を示し、同図（Ａ）は縦断面図、同図（Ｂ）は（
Ａ）のＢ−Ｂに沿った横断面図、第４図は第２図。
第３図の部分拡大図である。
１・・・補修管、２・・・欠陥、３・・・全周当て板、
３ａ・・・部分当て板、４・・・すみ肉溶接、５・・・
分割部溶接、６・・・管内液体、６１・・・たまり水、
７・・・溶接アーク、８・・・加圧チャンバー、９・・
・ゴムシール、１０・・・ガス入口、１１・・・加圧ガ
ス、１２・・・石英ガラス板、１３・・・０リング、１
４・・・押さえフランジ、１５・・・集光光学系、１６
・・・Ｌ／−４）’−光、１７．・・摩碕舒。FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a method for repairing a fully illuminated shingle. Figure 2 shows the conventional guessing Fi? ! The same figure (A
) is a partial vertical front view, (B) is a cross-sectional view taken along line B-B in (A), and Figure 3 shows a conventional patch repair method different from the above. The vertical cross-sectional view (B) is (
A cross-sectional view taken along line B-B of A), FIG. 4 is FIG. FIG. 4 is a partially enlarged view of FIG. 3; 1... Repair pipe, 2... Defect, 3... Full circumference patch plate,
3a... Partial patch plate, 4... Fillet welding, 5...
Divided part welding, 6... liquid in pipe, 61... accumulated water,
7... Welding arc, 8... Pressurized chamber, 9...
・Rubber seal, 10... Gas inlet, 11... Pressurized gas, 12... Quartz glass plate, 13... 0 ring, 1
4... Holder flange, 15... Condensing optical system, 16
...L/-4)'-light, 17. ... Masaki Shu.
Claims (1)
る当て板をすみ肉溶接して補修するにあたり、上記配管
類の欠陥部の外表面からガス圧により液体漏洩を阻止し
ながら同欠陥部をレーザー溶接したのち、その上に当て
板をすみ肉溶接して取付けることを特徴とする当て板補
修方法。When repairing a defective part of piping by fillet welding a patch plate to the outer surface of the defective part to prevent liquid leakage in the pipe, gas pressure is used to prevent liquid leakage from the outer surface of the defective part of the piping while repairing the same defect. A patch plate repair method characterized by laser welding the parts and then attaching the patch plate thereon by fillet welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1278237A JPH03142096A (en) | 1989-10-25 | 1989-10-25 | Method for repair by backing strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1278237A JPH03142096A (en) | 1989-10-25 | 1989-10-25 | Method for repair by backing strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03142096A true JPH03142096A (en) | 1991-06-17 |
Family
ID=17594530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1278237A Pending JPH03142096A (en) | 1989-10-25 | 1989-10-25 | Method for repair by backing strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03142096A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4315571A1 (en) * | 1993-05-11 | 1994-11-17 | Rolf Gasmann | Method and device for welding up leakage openings |
| JP2008207234A (en) * | 2007-02-28 | 2008-09-11 | Toshiba Corp | Underwater repair welding method |
| CN102297313A (en) * | 2011-08-12 | 2011-12-28 | 天津二十冶建设有限公司 | Water and pressure contained weld seam trapping method and structure for middle-large caliber pressure-bearing water pipe |
-
1989
- 1989-10-25 JP JP1278237A patent/JPH03142096A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4315571A1 (en) * | 1993-05-11 | 1994-11-17 | Rolf Gasmann | Method and device for welding up leakage openings |
| JP2008207234A (en) * | 2007-02-28 | 2008-09-11 | Toshiba Corp | Underwater repair welding method |
| CN102297313A (en) * | 2011-08-12 | 2011-12-28 | 天津二十冶建设有限公司 | Water and pressure contained weld seam trapping method and structure for middle-large caliber pressure-bearing water pipe |
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