JP3249360B2 - Inspection method of weld joint of welding rotor - Google Patents
Inspection method of weld joint of welding rotorInfo
- Publication number
- JP3249360B2 JP3249360B2 JP29756395A JP29756395A JP3249360B2 JP 3249360 B2 JP3249360 B2 JP 3249360B2 JP 29756395 A JP29756395 A JP 29756395A JP 29756395 A JP29756395 A JP 29756395A JP 3249360 B2 JP3249360 B2 JP 3249360B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- inspection hole
- inspecting
- joint
- inspection
- 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.)
- Expired - Lifetime
Links
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
- Machine Tool Sensing Apparatuses (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、蒸気タービンの分
割中空ディスク溶接ローターの中空ディスク溶接継手部
の検査方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a hollow disk welding joint of a split hollow disk welding rotor of a steam turbine.
【０００２】[0002]
【従来の技術】蒸気タービンの分割中空ディスク溶接ロ
ーター１は、図２縦断面図に示すように、支持軸３を有
する両端の中空ディスク２の間に、複数の中間の中空デ
ィスク２が嵌め合わされ、互いに隣接する中空ディスク
２の当接部は溶接継手部４にて結合されている。このよ
うな構造の分割中空ディスク溶接ローター１にあって
は、溶接継手部４の欠陥状態を把握することは重要なこ
とで欠陥が看過されれば大事故に繋がる。そこで従来こ
の健全性の検査は溶接後、外表面からの超音波探傷試験
で確認されており、溶接個所を超音波探傷試験で確認す
る場合、一般には横波を利用した斜角探傷にて行われる
が、斜角探傷では欠陥エコーが出てもエコーの発生位置
を垂直探傷のように直観的にとられられない。すなわち
欠陥の形態によっては、音波の入射方向によりエコー高
さが著しく異なるので技術的に難しい点があり、また裏
波の状態によってはエコーの乱れが生じ欠陥の有無を精
度良く確認できない。2. Description of the Related Art A split hollow disk welding rotor 1 for a steam turbine has a plurality of intermediate hollow disks 2 fitted between hollow disks 2 having a support shaft 3 at both ends as shown in a longitudinal sectional view of FIG. The contact portions of the hollow disks 2 adjacent to each other are joined by a weld joint portion 4. In the split hollow disk welding rotor 1 having such a structure, it is important to grasp the defect state of the welded joint portion 4. If the defect is overlooked, a large accident may occur. Therefore, conventionally, this soundness inspection has been confirmed by ultrasonic inspection from the outer surface after welding, and when confirming the welding location by ultrasonic inspection, it is generally performed by oblique flaw detection using transverse waves. However, even when a defect echo is generated in the oblique flaw detection, the position where the echo is generated cannot be intuitively detected as in the case of the vertical flaw detection. That is, depending on the form of the defect, the height of the echo significantly varies depending on the incident direction of the sound wave, which is technically difficult. In addition, the echo is disturbed depending on the state of the back wave, and the presence or absence of the defect cannot be accurately confirmed.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、このような
事情に鑑みて提案されたもので、溶接ローターの中空デ
ィスク溶接継手部の欠陥の有無の確認を精度良く行うこ
とができるとともに、検査後のローター内への蒸気の漏
入を確実に防止することができる溶接ローターの溶接継
手部検査方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and it is possible to accurately confirm the presence or absence of a defect in a hollow disk welding joint of a welding rotor, and to perform inspection. An object of the present invention is to provide a method for inspecting a welded joint portion of a welding rotor, which can reliably prevent steam from leaking into the rotor later.
【０００４】[0004]
【課題を解決するための手段】そのために本発明は、蒸
気タービンの分割中空ディスク溶接ローターの中空ディ
スク溶接継手部を検査するにあたり、溶接継手部の近傍
に奥に段部を有し入口にねじ部を有する検査穴を穿設
し、同検査穴にＸ線源を挿入して溶接継手部の放射線透
過試験を行って健全性を検査し、検査後上記検査穴の段
部にパッキンを挿入したうえねじ部にプラグを螺入しプ
ラグの周縁にコーキングを施すことを特徴とする。Accordingly, the present invention provides a method for inspecting a hollow disk welding joint of a split hollow disk welding rotor of a steam turbine, which has a step at a depth near a welding joint and a screw at an inlet. An inspection hole having a part was drilled, an X-ray source was inserted into the inspection hole, a radiation transmission test was performed on the welded joint to check the soundness, and after inspection, packing was inserted into the step of the inspection hole. The plug is screwed into the upper screw portion, and caulking is performed on the periphery of the plug.
【０００５】[0005]
【発明の実施の形態】本発明溶接ローターの溶接継手部
検査方法の実施形態を図１縦断面図について説明する
と、分割中空ディスク溶接ローター１は、隣接する中空
ディスク２，２同士の突合わせ当接部が溶接継手部４に
て結合されている。この溶接継手部４の初層の状態，裏
波の状態，アンダーカット等の欠陥の有無を検査するた
めに、溶接継手部４の近傍に、奥に段部５ａ，入口にね
じ部５ｂを形成した検査穴５を穿設し、この検査穴５内
へ放射線透過試験用のＸ線源を挿入して、溶接の初層を
盛った段階で溶接ビードの表面にフィルムを貼り放射線
透過試験を行う。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for inspecting a weld joint of a welding rotor according to the present invention will be described with reference to a longitudinal sectional view of FIG. 1. A divided hollow disk welding rotor 1 is used for abutting the adjacent hollow disks 2 and 2. The contact portions are joined by a weld joint 4. A step 5a is formed near the welded joint 4 at the back and a thread 5b is formed at the entrance in order to inspect the welded joint 4 for the initial layer state, the state of the underside, and the presence or absence of defects such as undercuts. The inspection hole 5 is drilled, an X-ray source for a radiation transmission test is inserted into the inspection hole 5, and a film is applied to the surface of the weld bead at the stage when the first layer of welding is piled up to perform a radiation transmission test. .
【０００６】放射線透過試験は放射線が物質を通過する
際の散乱，吸収による強度変化をとらえることにより欠
陥の検出，内部構造の検査を行い、Ｘ線による写真が最
もコントラストが高く検出度が高い。これによって溶接
継手部４の初層の状態，裏波の状態，アンダーカットの
有無が精度良く確認することができる。なお検査穴５内
へファイバースコープを２個挿入すれば立体映像が得ら
れ、裏波の状態，アンダーカットの有無の把握がより的
確に行われる。[0006] In the radiation transmission test, defects are detected and the internal structure is inspected by detecting changes in intensity due to scattering and absorption of radiation when the radiation passes through a substance. X-ray photographs have the highest contrast and the highest degree of detection. As a result, the state of the first layer of the welded joint portion 4, the state of the undercut, and the presence or absence of undercut can be accurately confirmed. In addition, if two fiberscopes are inserted into the inspection hole 5, a stereoscopic image can be obtained, and the state of the backwash and the presence or absence of undercut can be more accurately grasped.
【０００７】検査後は、検査穴５の段部５ａにパッキン
６を挿入したうえ、ねじ部５ｂにプラグ７を螺入してパ
ッキン６を押さえ、プラグ７の周縁にコーキングを施
す。これにより分割中空ディスク溶接ローター１内への
蒸気の漏入はないし、プラグ７の飛び出しもない。After the inspection, the packing 6 is inserted into the step 5a of the inspection hole 5, the plug 7 is screwed into the screw portion 5b, the packing 6 is pressed, and the periphery of the plug 7 is caulked. As a result, no steam leaks into the split hollow disk welding rotor 1 and no plug 7 jumps out.
【０００８】[0008]
【発明の効果】要するに本発明によれば、蒸気タービン
の分割中空ディスク溶接ローターの中空ディスク溶接継
手部を検査するにあたり、溶接継手部の近傍に奥に段部
を有し入口にねじ部を有する検査穴を穿設し、同検査穴
にＸ線源を挿入して溶接継手部の放射線透過試験を行っ
て健全性を検査し、検査後上記検査穴の段部にパッキン
を挿入したうえねじ部にプラグを螺入しプラグの周縁に
コーキングを施すことにより、溶接ローターの中空ディ
スク溶接継手部の欠陥の有無の確認を精度良く行うこと
ができるとともに、検査後のローター内への蒸気の漏入
を確実に防止することができる溶接ローターの溶接継手
部検査方法を得るから、本発明は産業上極めて有益なも
のである。In summary, according to the present invention, when inspecting a hollow disk welding joint of a split hollow disk welding rotor of a steam turbine, a step is provided near the welding joint and a thread is provided at an inlet. An inspection hole is drilled, an X-ray source is inserted into the inspection hole, a radiation penetration test is performed on the welded joint to check the soundness, and after inspection, packing is inserted into the step of the inspection hole and a screw portion is inserted. By screwing the plug into the plug and applying caulking to the periphery of the plug, it is possible to accurately check for defects in the welding joint of the hollow disk of the welding rotor and to prevent steam from leaking into the rotor after inspection. Therefore, the present invention is industrially very useful because it provides a method for inspecting a welded joint portion of a welding rotor that can reliably prevent the occurrence of cracks.
【図１】本発明溶接ローターの溶接継手部検査方法の実
施形態を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing an embodiment of a method for inspecting a welded joint portion of a welding rotor of the present invention.
【図２】公知の分割中空ディスク溶接ローターの縦断面
図である。FIG. 2 is a longitudinal sectional view of a known split hollow disk welding rotor.
１ 分割中空ディスク溶接ローター ２ 中空ディスク ４ 溶接継手部 ５ 検査穴 ５ａ 段部 ５ｂ ねじ部 ６ パッキン ７ プラグ DESCRIPTION OF SYMBOLS 1 Split hollow disk welding rotor 2 Hollow disk 4 Weld joint part 5 Inspection hole 5a Step part 5b Screw part 6 Packing 7 Plug
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 31/00 F01D 25/00 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) B23K 31/00 F01D 25/00
Claims (2)
ーターの中空ディスク溶接継手部を検査するにあたり、
溶接継手部の近傍に奥に段部を有し入口にねじ部を有す
る検査穴を穿設し、同検査穴にＸ線源を挿入して溶接継
手部の放射線透過試験を行って健全性を検査し、検査後
上記検査穴の段部にパッキンを挿入したうえねじ部にプ
ラグを螺入しプラグの周縁にコーキングを施すことを特
徴とする溶接ローターの溶接継手部検査方法。In inspecting a hollow disk welding joint of a split hollow disk welding rotor of a steam turbine,
An inspection hole with a step at the back and a screw thread at the entrance is drilled near the weld joint, and an X-ray source is inserted into the inspection hole to conduct a radiation transmission test of the weld joint to ensure soundness. A method for inspecting a welded joint of a welding rotor, comprising inspecting, after inspection, inserting a packing into a step portion of the inspection hole, screwing a plug into a screw portion, and caulking the periphery of the plug.
放射線透過試験を行うとともに、同検査穴に２個のファ
イバースコープを挿入して立体映像を得て健全性を検査
することを特徴とする請求項１記載の溶接ローターの溶
接継手部検査方法。2. An X-ray source is inserted into an inspection hole to perform a radiation transmission test of a welded joint portion, and two fiberscopes are inserted into the inspection hole to obtain a stereoscopic image to inspect soundness. The method for inspecting a welded joint of a welding rotor according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29756395A JP3249360B2 (en) | 1995-10-20 | 1995-10-20 | Inspection method of weld joint of welding rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29756395A JP3249360B2 (en) | 1995-10-20 | 1995-10-20 | Inspection method of weld joint of welding rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09108883A JPH09108883A (en) | 1997-04-28 |
| JP3249360B2 true JP3249360B2 (en) | 2002-01-21 |
Family
ID=17848170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29756395A Expired - Lifetime JP3249360B2 (en) | 1995-10-20 | 1995-10-20 | Inspection method of weld joint of welding rotor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3249360B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3999402B2 (en) * | 1998-06-09 | 2007-10-31 | 三菱重工業株式会社 | Dissimilar welding rotor for steam turbine |
| US20090060735A1 (en) * | 2007-08-31 | 2009-03-05 | General Electric Company | Turbine rotor apparatus and system |
| DE102009024580B4 (en) * | 2009-06-10 | 2011-03-24 | Siemens Aktiengesellschaft | Improved test procedure for welded shafts |
| JP5822496B2 (en) * | 2011-03-23 | 2015-11-24 | 三菱日立パワーシステムズ株式会社 | Turbine rotor and method of manufacturing turbine rotor |
| JP6239230B2 (en) * | 2012-12-05 | 2017-11-29 | 三菱日立パワーシステムズ株式会社 | Manufacturing method of turbine rotor |
| DE102014204912A1 (en) * | 2014-03-17 | 2015-09-17 | Siemens Aktiengesellschaft | Method for closing a hole and component |
| US9724785B2 (en) | 2014-05-15 | 2017-08-08 | Solar Turbines Incorporated | Radiographic markers for partial penetration welded joints |
| CN110524129B (en) * | 2018-05-23 | 2021-07-20 | 中铁宝桥集团有限公司 | Welding deformation control method for large-size super-thick bridge steel tower bearing plate |
-
1995
- 1995-10-20 JP JP29756395A patent/JP3249360B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09108883A (en) | 1997-04-28 |
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