JPH11132921A - Introducing device/method for thermal fatigue - Google Patents

Introducing device/method for thermal fatigue

Info

Publication number
JPH11132921A
JPH11132921A JP9301260A JP30126097A JPH11132921A JP H11132921 A JPH11132921 A JP H11132921A JP 9301260 A JP9301260 A JP 9301260A JP 30126097 A JP30126097 A JP 30126097A JP H11132921 A JPH11132921 A JP H11132921A
Authority
JP
Japan
Prior art keywords
metal
defect
thermal fatigue
introducing
processed
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
Application number
JP9301260A
Other languages
Japanese (ja)
Inventor
Yasuhiro Tanaka
保博 田中
Kumiko Araki
久美子 荒木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Priority to JP9301260A priority Critical patent/JPH11132921A/en
Publication of JPH11132921A publication Critical patent/JPH11132921A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Landscapes

  • Sampling And Sample Adjustment (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PROBLEM TO BE SOLVED: To give the inspection defects of target sizes in desired positions on the corner inner face of a nozzle along a desired direction, especially a tube axial direction, to provide a sample where the appropriate quantity of the inspection defects are formed and to contribute to the development of an inspection device and to the improvement of precision. SOLUTION: A technology for introducing the inspection defects based on thermal fatigue to a treated metal surface X, which is the corner inner face of the piping nozzle N, is provided with an induction heat coil 1 which is arranged on the treated metal surface X in an approximate state and which induces and heats the treated metal surface X and a cooling medium jet means 2 which is provided for the induction heat coil 1, jets the cooling medium and cools the treated metal surface X in a heating state. The processes of induction heating and cooling are repeated.

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、熱疲労欠陥の導入
装置及び熱疲労欠陥の導入方法に係り、特に、配管ノズ
ルのコーナ内面に所望の大きさの検査用欠陥を導入する
技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal fatigue defect introducing apparatus and a thermal fatigue defect introducing method, and more particularly to a technique for introducing a defect having a desired size into an inner surface of a pipe nozzle corner. is there.

【０００２】[0002]

【従来の技術】応力腐食割れを導入したＳＣＣ入りパイ
プサンプルの製作方法として、技術例１：特開平３−８
１０８９号公報（ＳＣＣ入りパイプサンプルの製作方
法）に示す技術が提案されている。該技術例では、金属
管（例えばオーステナイト系ステンレス鋼管の一種であ
るＳＵＳ３０４鋼管）に周溶接継手が形成されている場
合、周溶接継手を周方向に沿って溝状に削除して溶接開
先を形成し、該溶接開先に溶接ビードを重畳して補修肉
盛り周溶接継手を形成して溶接残留応力の方向を設定
し、金属管の内部に腐食液を充満させてクラックを成長
させるというものである。2. Description of the Related Art As a method of manufacturing a pipe sample containing SCC into which stress corrosion cracking is introduced, a technical example 1: Japanese Patent Laid-Open No. 3-8 / 1990
A technique disclosed in Japanese Patent No. 1089 (a method of manufacturing a pipe sample containing SCC) has been proposed. In this technical example, when a girth weld joint is formed in a metal pipe (for example, SUS304 steel pipe, which is a type of austenitic stainless steel pipe), the girth weld joint is deleted in a groove shape along the circumferential direction to reduce the welding groove. Forming a weld bead on the weld groove to form a repair weld overlay girth weld joint to set the direction of welding residual stress, fill the inside of the metal pipe with a corrosive liquid and grow cracks It is.

【０００３】この方法によって、金属管の内面に深く大
きくかつ長さの方向を設定した応力腐食割れ（ＳＣＣ）
を発生させて、特に、標準的な粒界応力腐食割れを意図
的に導入したパイプサンプルが製作される。[0003] By this method, stress corrosion cracking (SCC) having a deep, large and set length direction is formed on the inner surface of a metal tube.
In particular, to produce pipe samples intentionally introducing standard intergranular stress corrosion cracking.

【０００４】[0004]

【発明が解決しようとする課題】しかし、前述した配管
ノズルのコーナ内面形状は、ノズルのコーナに沿った形
状変化が大きいために、技術例１の適用が困難なものと
なる。However, it is difficult to apply the first technical example to the above-described inner shape of the corner of the piping nozzle due to a large change in shape along the corner of the nozzle.

【０００５】本発明は、このような事情に鑑みてなされ
たもので、以下の目的を達成しようとするものである。 ノズルのコーナ内面に、所望方向，特に管軸方向に沿
って目的とする大きさの検査用欠陥を付与すること。 検査用欠陥を、所望位置にかつ確実に形成すること。 検査用欠陥を適正量形成したサンプルを提供し、検査
装置の開発及び精度向上に寄与すること。The present invention has been made in view of such circumstances, and aims to achieve the following objects. To provide an inspection defect of a desired size on the inner surface of the corner of the nozzle along a desired direction, particularly along the tube axis direction. Inspection defects are formed at desired positions and reliably. Providing a sample with an appropriate amount of inspection defects to contribute to the development and accuracy improvement of inspection equipment.

【０００６】[0006]

【課題を解決するための手段】被処理金属表面に熱疲労
に基づく検査用欠陥を導入する装置として、被処理金属
表面が、配管ノズルのコーナ内面とされるとともに、被
処理金属表面に近接状態に配されて被処理金属表面を誘
導加熱するための誘導加熱コイルと、該誘導加熱コイル
に併設され冷却媒体を噴出して加熱状態の被処理金属表
面を冷却する冷却媒体噴出手段とを具備するものが採用
される。誘導加熱コイルは、配管ノズルのコーナ内面形
状に合わせてベル状に配され、冷却媒体噴出手段は、誘
導加熱コイルに添わせた状態の冷却管と、該冷却管に配
されて冷却媒体を噴出する噴出口とを有しているものが
適用される。被処理金属表面に熱疲労に基づく検査用欠
陥を導入する際には、被処理金属表面を誘導加熱して高
温状態とする工程と、被処理金属表面に冷却媒体を噴出
して加熱状態の被処理金属表面を冷却して引っ張り残留
応力を付与する工程とにより行なわれるとともに、これ
らの工程を繰り返して検査用欠陥を成長させる技術が採
用される。加えて、被処理金属表面に余盛り状態のクラ
ッド層を形成する工程と、該クラッド層にダミークラッ
クを形成する工程と、ダミークラックを成長させて所望
の大きさの検査用欠陥を付与する工程と、ダミークラッ
クの形成後にクラッド層を除去する工程とを有する技術
により実施される。そして、ダミークラックを配管ノズ
ルのコーナ内面に沿って形成する技術や、被処理金属表
面に近接状態に配した誘導加熱コイルと冷却媒体噴出手
段とを交互に作動させて、被処理金属表面の加熱及び冷
却を交互に行なう技術も適用される。As an apparatus for introducing a defect for inspection based on thermal fatigue into a surface of a metal to be treated, the surface of the metal to be treated is an inner surface of a corner of a piping nozzle and is in a state close to the surface of the metal to be treated. And an induction heating coil for inductively heating the surface of the metal to be treated, and cooling medium ejecting means provided alongside the induction heating coil to eject a cooling medium to cool the surface of the metal to be heated in the heated state. Things are adopted. The induction heating coil is arranged in a bell shape according to the inner surface shape of the corner of the piping nozzle, and the cooling medium jetting means is provided with the cooling pipe attached to the induction heating coil and the cooling pipe is jetted with the cooling medium. The one having a spout which is used is applied. When introducing a defect for inspection based on thermal fatigue into the surface of a metal to be treated, a step of inductively heating the surface of the metal to be treated to bring it to a high temperature state, and a step of ejecting a cooling medium to the surface of the metal to be treated to thereby form a heated state. A step of applying a tensile residual stress by cooling the surface of the treated metal, and repeating these steps to grow a defect for inspection. In addition, a step of forming an extra clad layer on the surface of the metal to be processed, a step of forming a dummy crack in the clad layer, and a step of growing a dummy crack to give a defect having a desired size for inspection. And a step of removing the clad layer after the formation of the dummy crack. The dummy cracks are formed along the inner surface of the corner of the piping nozzle, and the induction heating coil and cooling medium ejecting means arranged in close proximity to the metal surface to be processed are alternately operated to heat the metal surface to be processed. A technique of alternately performing cooling and cooling is also applied.

【０００７】[0007]

【発明の実施の形態】以下、本発明に係る熱疲労欠陥の
導入技術の第１実施形態について、図１ないし図４に基
づいて説明する。以下、配管ノズルのコーナ内面に、熱
疲労欠陥を導入する処理工程順に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a technique for introducing a thermal fatigue defect according to the present invention will be described below with reference to FIGS. Hereinafter, the processing steps for introducing a thermal fatigue defect on the inner surface of the corner of the pipe nozzle will be described in the order of the processing steps.

【０００８】〔適用対象物〕図１例では、熱疲労欠陥を
導入する対象物が、容器Ｖに配管Ｐを溶接部Ｗの形成に
より接続するための配管ノズルＮとされている。かつ、
被処理金属表面Ｘが配管ノズルＮのコーナ内面とされ
る。そして、配管ノズルＮの部分は、低合金鋼，炭素
鋼，ステンレス鋼等により構成され、被処理金属表面Ｘ
は、配管ノズルＮに、例えばステンレス鋼を肉盛り溶接
してなるものとされる。図１において、符号Ａは導入装
置、Ｃはダミークラック、１は誘導加熱コイル、２は冷
却媒体噴出手段、３はクラッド層を示している。[Application Object] In the example shown in FIG. 1, an object to which a thermal fatigue defect is introduced is a pipe nozzle N for connecting a pipe P to a container V by forming a welded portion W. And,
The surface X of the metal to be treated is the inner surface of the corner of the pipe nozzle N. The portion of the pipe nozzle N is made of a low alloy steel, carbon steel, stainless steel, or the like.
Is formed by, for example, overlay welding stainless steel to the piping nozzle N. In FIG. 1, reference numeral A denotes an introduction device, C denotes a dummy crack, 1 denotes an induction heating coil, 2 denotes a cooling medium ejection unit, and 3 denotes a clad layer.

【０００９】〔クラッド層の形成〕前記クラッド層３
は、図１に示すように、配管ノズルＮのコーナ内面にお
ける被処理金属表面Ｘに、同じ材料の肉盛り溶接を行な
うことにより内周に沿って全周に形成される。したがっ
て、被処理金属表面Ｘには、これよりも内方に若干突出
した余盛り状態のクラッド層３が形成される。[Formation of Cladding Layer] The cladding layer 3
As shown in FIG. 1, is formed over the entire circumference along the inner periphery by performing build-up welding of the same material on the metal surface X to be processed on the inner surface of the corner of the piping nozzle N. Therefore, the cladding layer 3 in a surplus state slightly protruding inward from the metal surface X to be processed is formed.

【００１０】〔ダミークラックの形成〕前記ダミークラ
ックＣは、例えば放電加工により、図１に示すように、
クラッド層３の複数箇所に、管軸方向に沿って形成され
る。[Formation of Dummy Crack] The dummy crack C is formed by, for example, electric discharge machining as shown in FIG.
A plurality of portions of the clad layer 3 are formed along the tube axis direction.

【００１１】〔導入装置の設置〕前記導入装置Ａは、配
管ノズルＮのコーナ内面形状に合わせて、予めベル状及
び螺旋状に作製しておいた誘導加熱コイル１と冷却媒体
噴出手段２とによって構成され、冷却媒体噴出手段２
は、誘導加熱コイル１に添わせて一体に形成された状態
の冷却管２ａと、該冷却管２ａに配されて冷却媒体を噴
出する噴出口２ｂとを有しているものが適用される。誘
導加熱コイル１及び冷却管２ａは、図１に示すように、
配管ノズルＮのコーナの内面形状に合わせて形成してお
いたものを、配管ノズルＮの中に、被処理金属表面Ｘに
近接状態に配して使用する。[Installation of Introducing Apparatus] The introducing apparatus A is provided with an induction heating coil 1 and a cooling medium ejection means 2 which have been formed in advance into a bell shape and a spiral shape in accordance with the inner surface shape of the pipe nozzle N. Cooling medium jetting means 2
The one having a cooling pipe 2a integrally formed along with the induction heating coil 1 and an ejection port 2b arranged in the cooling pipe 2a to eject a cooling medium is applied. The induction heating coil 1 and the cooling pipe 2a are, as shown in FIG.
What is formed according to the inner surface shape of the corner of the piping nozzle N is disposed in the piping nozzle N in a state close to the metal surface X to be treated.

【００１２】〔被処理金属表面の誘導加熱〕誘導加熱コ
イル１に高周波電流を給電することにより、被処理金属
表面Ｘを誘導加熱して高温状態に導く。[Induction Heating of the Metal Surface to be Treated] By supplying a high-frequency current to the induction heating coil 1, the metal surface X to be processed is induction-heated to a high temperature state.

【００１３】〔被処理金属表面の冷却〕冷却媒体噴出手
段２における冷却管２ａに、水等の冷却媒体を供給し
て、図２に示すように、複数の噴出口２ｂから冷却媒体
を噴出することにより、被処理金属表面Ｘを急速に冷却
する。加熱状態の被処理金属表面Ｘを急冷すると、被処
理金属表面Ｘに引っ張り応力が付与される。[Cooling of Metal Surface to be Treated] A cooling medium such as water is supplied to a cooling pipe 2a in the cooling medium jetting means 2, and the cooling medium is jetted from a plurality of jet ports 2b as shown in FIG. This rapidly cools the metal surface X to be processed. When the metal surface X to be processed in the heated state is rapidly cooled, a tensile stress is applied to the metal surface X to be processed.

【００１４】〔検査用欠陥の成長〕被処理金属表面Ｘに
ついて、誘導加熱と急冷との工程を繰り返すと、クラッ
ド層３に対する熱疲労に基づいて、ダミークラックＣが
次第に成長し、その直下の被処理金属表面Ｘにもクラッ
ク状の検査用欠陥Ｙが発生するとともに、該検査用欠陥
Ｙが徐々に成長することになる。[Growth of Inspection Defects] When the steps of induction heating and quenching are repeated on the metal surface X to be processed, dummy cracks C gradually grow based on the thermal fatigue of the cladding layer 3 and the surface of the metal crack X just below it. Crack-shaped inspection defects Y are also generated on the treated metal surface X, and the inspection defects Y gradually grow.

【００１５】〔導入装置の撤去〕被処理金属表面Ｘに、
クラック状の検査用欠陥Ｙが所望の大きさ及び深さにま
で成長したら、誘導加熱及び急冷を停止するとともに、
導入装置Ａを撤去する。図３は、導入装置Ａを撤去した
後の状態を示しており、クラッド層３及び被処理金属表
面Ｘには、ダミークラックＣ及び検査用欠陥Ｙが連なっ
て形成されることになる。[Removal of the introduction device]
When the crack-like inspection defect Y has grown to a desired size and depth, the induction heating and quenching are stopped,
The introduction device A is removed. FIG. 3 shows a state after the introduction device A is removed, and the dummy crack C and the inspection defect Y are formed continuously on the cladding layer 3 and the surface X of the metal to be processed.

【００１６】〔クラッド層の削除〕検査用欠陥Ｙが所望
大きさまで成長した後に、余盛り状態のクラッド層３を
研削して、図４に示すように、ダミークラックＣの部分
とともに除去する。[Deletion of Cladding Layer] After the inspection defect Y has grown to a desired size, the excess cladding layer 3 is ground and removed together with the dummy cracks C as shown in FIG.

【００１７】ダミークラックＣの部分の除去により、当
初の被処理金属表面Ｘには、検査用欠陥Ｙが付与された
状態となり、かかる配管ノズルＮは、検査用欠陥Ｙを適
正量形成したサンプルとして提供され、熱疲労に基づく
基準の検査用欠陥Ｙとして、クラック等の欠陥を検出す
る技術の修練や、検査装置の開発及び精度向上に寄与す
るものとなる。By removing the portion of the dummy crack C, a defect Y for inspection is given to the metal surface X to be processed initially, and the piping nozzle N is used as a sample in which a proper amount of the defect Y is formed. The provided inspection defect Y based on thermal fatigue contributes to training of technology for detecting a defect such as a crack, development of an inspection device, and improvement of accuracy.

【００１８】〔他の実施の形態〕本発明に係る熱疲労欠
陥の導入装置及び熱疲労欠陥の導入方法にあっては、以
下の技術を包含するものである。 ａ）被処理金属表面Ｘを、交互に誘導加熱及び冷却する
技術として、高周波電流をパルス電流により間欠的に給
電すること。 ｂ）高周波電流を連続的に流したまま、冷却のみを間欠
的に行なうこと。 ｃ）冷却媒体が、冷水以外の液状またはガス状の流体で
あること。 ｄ）ダミークラックＣ及び検査用欠陥Ｙの方向を任意方
向に設定すること。[Other Embodiments] The apparatus for introducing a thermal fatigue defect and the method for introducing a thermal fatigue defect according to the present invention include the following techniques. a) As a technique for alternately inductively heating and cooling the metal surface X to be processed, a high-frequency current is intermittently supplied by a pulse current. b) Intermittently performing only cooling with a high-frequency current continuously flowing. c) The cooling medium is a liquid or gaseous fluid other than cold water. d) The direction of the dummy crack C and the inspection defect Y is set to an arbitrary direction.

【００１９】[0019]

【発明の効果】本発明に係る熱疲労欠陥の導入装置及び
熱疲労欠陥の導入方法にあっては、以下のような効果を
奏する。 （１） 配管ノズルのコーナ内面とされる被処理金属表
面に合わせた誘導加熱コイルと冷却媒体噴出手段とを使
用して、誘導加熱と冷却との工程を繰り返すことによ
り、所望位置に熱疲労に基づく検査用欠陥を容易に導入
することができる。 （２） 被処理金属表面に余盛り状態のクラッド層とダ
ミークラックとを形成しておいて、ダミークラックを成
長させて所望の大きさの検査用欠陥を付与することによ
り、ノズルのコーナ内面に、所望方向，特に管軸方向に
沿って目的とする大きさの検査用欠陥を確実に形成する
ことができる。 （３） 上記により、検査用欠陥を適正量形成したサン
プルを提供し、検査装置の開発及び精度向上に寄与する
ことができる。The apparatus and method for introducing a thermal fatigue defect according to the present invention have the following effects. (1) The induction heating and cooling steps are repeated by using an induction heating coil and a cooling medium jetting means adapted to the surface of the metal to be treated, which is the inner surface of the pipe nozzle, so that the desired position can be thermally fatigued. Inspection defects can be easily introduced. (2) A clad layer and dummy cracks in an overfilled state are formed on the surface of the metal to be treated, and the dummy cracks are grown to give inspection defects of a desired size, so that the inner surface of the nozzle corner is formed. In addition, it is possible to reliably form an inspection defect of a desired size along a desired direction, particularly along the tube axis direction. (3) As described above, it is possible to provide a sample in which an inspection defect is formed in an appropriate amount, thereby contributing to development of an inspection apparatus and improvement in accuracy.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明に係る熱疲労欠陥の導入技術の第１実
施形態における誘導加熱コイル及び冷却媒体噴出手段の
設置状況を示す正断面図である。FIG. 1 is a front sectional view showing an installation state of an induction heating coil and a cooling medium ejection unit in a first embodiment of a technique for introducing a thermal fatigue defect according to the present invention.

【図２】 本発明に係る熱疲労欠陥の導入技術の第１実
施形態における冷却媒体噴出手段の作動状況を示す正断
面図である。FIG. 2 is a front sectional view showing an operation state of a cooling medium ejection unit in the first embodiment of the thermal fatigue defect introducing technique according to the present invention.

【図３】 本発明に係る熱疲労欠陥の導入技術の第１実
施形態における導入装置の撤去後のダミークラック及び
検査用欠陥の状況を示す正断面図である。FIG. 3 is a front sectional view showing a state of a dummy crack and a defect for inspection after removal of the introducing device in the first embodiment of the thermal fatigue defect introducing technology according to the present invention.

【図４】 本発明に係る熱疲労欠陥の導入技術の第１実
施形態におけるクラッド層除去後の検査用欠陥の状況を
示す正断面図である。FIG. 4 is a front sectional view showing the state of the inspection defect after removing the clad layer in the first embodiment of the thermal fatigue defect introduction technique according to the present invention.

【符号の説明】 Ａ 導入装置 Ｖ 容器 Ｐ 配管 Ｗ 溶接部 Ｎ 配管ノズル Ｘ 被処理金属表面 Ｃ ダミークラック Ｙ 検査用欠陥 １ 誘導加熱コイル ２ 冷却媒体噴出手段 ２ａ 冷却管 ２ｂ 噴出口 ３ クラッド層[Explanation of Symbols] A Introducing device V Container P Piping W Welded part N Piping nozzle X Metal surface to be treated C Dummy crack Y Inspection defect 1 Induction heating coil 2 Cooling medium jetting means 2a Cooling pipe 2b Spout 3 Cladding layer

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ２１Ｄ 9/08 Ｃ２１Ｄ 9/08 Ｄ Ｇ２１Ｃ 17/003 Ｇ２１Ｃ 17/00 Ｅ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C21D 9/08 C21D 9/08 D G21C 17/003 G21C 17/00 E

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 被処理金属表面（Ｘ）に熱疲労に基づく
検査用欠陥（Ｙ）を導入する装置であって、被処理金属
表面が、配管ノズル（Ｎ）のコーナ内面とされるととも
に、被処理金属表面に近接状態に配されて被処理金属表
面を誘導加熱するための誘導加熱コイル（１）と、該誘
導加熱コイルに併設され冷却媒体を噴出して加熱状態の
被処理金属表面を冷却する冷却媒体噴出手段（２）とを
具備することを特徴とする熱疲労欠陥の導入装置。An apparatus for introducing an inspection defect (Y) based on thermal fatigue into a surface of a metal to be processed (X), wherein the surface of the metal to be processed is an inner surface of a corner of a pipe nozzle (N). An induction heating coil (1) arranged in close proximity to the surface of the metal to be processed for induction heating the surface of the metal to be processed; An apparatus for introducing a thermal fatigue defect, comprising: a cooling medium jetting means (2) for cooling. 【請求項２】 誘導加熱コイル（１）が、配管ノズル
（Ｎ）のコーナ内面形状に合わせてベル状に配されるこ
とを特徴とする請求項１記載の熱疲労欠陥の導入装置。2. The thermal fatigue defect introducing device according to claim 1, wherein the induction heating coil (1) is arranged in a bell shape according to the inner surface shape of the corner of the pipe nozzle (N). 【請求項３】 冷却媒体噴出手段（２）が、誘導加熱コ
イル（１）に添わせた状態の冷却管（２ａ）と、該冷却
管に配されて冷却媒体を噴出する噴出口（２ｂ）とを有
していることを特徴とする請求項１または２記載の熱疲
労欠陥の導入装置。3. A cooling pipe (2a) in which cooling medium jetting means (2) is attached to an induction heating coil (1), and a jet port (2b) arranged in the cooling pipe and jetting a cooling medium. The thermal fatigue defect introducing device according to claim 1, comprising: 【請求項４】 被処理金属表面（Ｘ）に熱疲労に基づく
検査用欠陥（Ｙ）を導入する方法であって、被処理金属
表面を誘導加熱して高温状態とする工程と、被処理金属
表面に冷却媒体を噴出して加熱状態の被処理金属表面を
冷却して引っ張り残留応力を付与する工程とを有し、こ
れらの工程を繰り返して検査用欠陥を成長させることを
特徴とする熱疲労欠陥の導入方法。4. A method for introducing a defect (Y) for inspection based on thermal fatigue into a surface (X) of a metal to be processed, wherein the surface of the metal to be processed is induction-heated to a high temperature state; Cooling the surface of the metal to be heated in a heated state by applying a cooling medium to the surface to apply tensile residual stress, and repeating these steps to grow inspection defects. How to introduce defects. 【請求項５】 被処理金属表面（Ｘ）に余盛り状態のク
ラッド層（３）を形成する工程と、該クラッド層にダミ
ークラック（Ｃ）を形成する工程と、ダミークラックを
成長させて所望の大きさの検査用欠陥（Ｙ）を付与する
工程と、ダミークラックの形成後にクラッド層を除去す
る工程とを有することを特徴とする請求項４記載の熱疲
労欠陥の導入方法。5. A step of forming a cladding layer (3) in an overfilled state on the surface (X) of the metal to be treated, a step of forming a dummy crack (C) in the cladding layer, and growing the dummy crack to a desired level. The method for introducing a thermal fatigue defect according to claim 4, further comprising a step of providing a defect for inspection (Y) having a size of (a) and a step of removing the clad layer after forming the dummy crack. 【請求項６】 ダミークラック（Ｃ）を配管ノズル
（Ｎ）のコーナ内面に沿って形成することを特徴とする
請求項４または５記載の熱疲労欠陥の導入方法。6. The method for introducing a thermal fatigue defect according to claim 4, wherein the dummy cracks (C) are formed along the inner surface of the corner of the pipe nozzle (N). 【請求項７】 被処理金属表面（Ｘ）に近接状態に配し
た誘導加熱コイル（１）と冷却媒体噴出手段（２）とを
交互に作動させて、被処理金属表面の加熱及び冷却を交
互に行なうことを特徴とする請求項４、５または６記載
の熱疲労欠陥の導入方法。7. The heating and cooling of the surface of the metal to be processed is alternately performed by alternately operating the induction heating coil (1) and the cooling medium jetting means (2) arranged in the vicinity of the surface of the metal to be processed (X). The method for introducing a thermal fatigue defect according to claim 4, 5 or 6, wherein the method is performed.
JP9301260A 1997-10-31 1997-10-31 Introducing device/method for thermal fatigue Pending JPH11132921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9301260A JPH11132921A (en) 1997-10-31 1997-10-31 Introducing device/method for thermal fatigue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9301260A JPH11132921A (en) 1997-10-31 1997-10-31 Introducing device/method for thermal fatigue

Publications (1)

Publication Number Publication Date
JPH11132921A true JPH11132921A (en) 1999-05-21

Family

ID=17894684

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9301260A Pending JPH11132921A (en) 1997-10-31 1997-10-31 Introducing device/method for thermal fatigue

Country Status (1)

Country Link
JP (1) JPH11132921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003091709A1 (en) * 2002-04-26 2003-11-06 Babcock-Hitachi K.K. Method of causing intergranular stress corrosion crack to generate and grow in sample

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003091709A1 (en) * 2002-04-26 2003-11-06 Babcock-Hitachi K.K. Method of causing intergranular stress corrosion crack to generate and grow in sample
ES2281229A1 (en) * 2002-04-26 2007-09-16 Babcock-Hitachi K.K. Method of causing intergranular stress corrosion crack to generate and grow in sample
US7416623B2 (en) 2002-04-26 2008-08-26 Babcock-Hitachi K.K. Method of causing intergranular stress corrosion crack to generate and grow in sample

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