JP3533288B2 - Ultrasonic probe, pipe weld inspection apparatus and pipe weld inspection method - Google Patents

Ultrasonic probe, pipe weld inspection apparatus and pipe weld inspection method

Info

Publication number
JP3533288B2
JP3533288B2 JP12877596A JP12877596A JP3533288B2 JP 3533288 B2 JP3533288 B2 JP 3533288B2 JP 12877596 A JP12877596 A JP 12877596A JP 12877596 A JP12877596 A JP 12877596A JP 3533288 B2 JP3533288 B2 JP 3533288B2
Authority
JP
Japan
Prior art keywords
pipe
ultrasonic
probe
gap
water
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 - Fee Related
Application number
JP12877596A
Other languages
Japanese (ja)
Other versions
JPH09311127A (en
Inventor
茂 原田
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP12877596A priority Critical patent/JP3533288B2/en
Publication of JPH09311127A publication Critical patent/JPH09311127A/en
Application granted granted Critical
Publication of JP3533288B2 publication Critical patent/JP3533288B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/269—Various geometry objects
    • G01N2291/2695—Bottles, containers

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (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】この発明は、超音波探傷試験
法を用いて管溶接部を検査する超音波探触子、管溶接部
検査装置および管溶接部検査方法に係り、特に内挿型の
超音波探触子に使用する接触媒質の導入等の工夫に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic probe for inspecting a pipe weld portion using an ultrasonic flaw detection test method, a pipe weld portion inspection device, and a pipe weld portion inspection method, and more particularly to an insertion type The present invention relates to a device such as introduction of a contact medium used for an ultrasonic probe.

【０００２】[0002]

【従来の技術】従来、超音波探傷試験法を用いて給水加
熱器等の伝熱管と管板との間の管溶接部を検査する管溶
接部検査装置が知られている。2. Description of the Related Art Conventionally, there has been known a pipe welding portion inspection device for inspecting a pipe welding portion between a heat transfer pipe such as a feed water heater and a pipe sheet by using an ultrasonic flaw detection test method.

【０００３】この管溶接部検査装置は、通常、プローブ
本体内に超音波振動子を配置した内挿型の超音波探触子
（超音波プローブ）を備えた構成で、検査対象の管溶接
部が形成された管内にプローブ本体を挿入し、超音波振
動子から所定の接触媒質を介して管溶接部に向けて超音
波ビームをスキャンさせながら、超音波振動子で受ける
超音波エコー信号を管溶接部検査用の超音波データ（指
示エコー）として画面等に表示させるマニュアル探傷法
により、管溶接部の傷の存否等を検査するようになって
いる。ここで、プローブ本体と管とが成す隙間内に導入
される接触媒質としては、通常、油やグリセリン等が使
用されている。This pipe welded portion inspection apparatus is usually provided with an insertion type ultrasonic probe (ultrasonic probe) in which an ultrasonic transducer is arranged in a probe main body, and the pipe welded portion to be inspected. Insert the probe main body into the tube with the ultrasonic transducer and scan the ultrasonic beam from the ultrasonic transducer toward the pipe weld through the specified contact medium, and The presence or absence of flaws in pipe welds is inspected by a manual flaw detection method in which ultrasonic data (instruction echo) for weld inspection is displayed on a screen or the like. Here, oil, glycerin, or the like is usually used as the contact medium introduced into the gap formed by the probe main body and the tube.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、従来の
マニュアル探傷法に基づく管溶接部検査装置にあって
は、検査時に隙間内の管溶接部の探傷面付近での接触媒
質の量が不十分な場合には、超音波ビームを管溶接部の
探傷面まで伝搬させることができず、この場合には管溶
接部に欠陥があっても、画面上に指示エコーが表示され
ないため、検査をやり直す等の必要があり、検査効率が
低下するといった問題があった。これとは逆に、接触媒
質の量が多すぎると、今度は検査終了後に接触媒質の回
収や除去等に多くの労力が必要となる。However, in the conventional pipe welded portion inspection apparatus based on the manual flaw detection method, the amount of the contact medium in the vicinity of the flaw detection surface of the pipe welded portion in the gap is insufficient during inspection. In this case, the ultrasonic beam cannot be propagated to the flaw detection surface of the pipe weld, and in this case, even if there is a defect in the pipe weld, the instruction echo is not displayed on the screen, so the inspection is repeated, etc. Therefore, there is a problem that the inspection efficiency is reduced. On the contrary, if the amount of the couplant is too large, a lot of labor is required to recover or remove the couplant after the inspection is completed.

【０００５】この発明は、このような従来の問題を考慮
してなされたもので、検査時に管とプローブ本体とが成
す隙間内に接触媒質を必要な量のみ安定供給し、この接
触媒質に起因する検査効率の低下を回避することを、主
要な目的とする。また、この発明は、検査終了後の接触
媒質の回収及び除去等を簡便に実施することを、別の目
的とする。The present invention has been made in consideration of such a conventional problem, and stably supplies only a necessary amount of the contact medium into the gap formed by the tube and the probe main body at the time of inspection, and is caused by this contact medium. The main purpose is to avoid a decrease in inspection efficiency. Another object of the present invention is to simply carry out the recovery and removal of the couplant after the inspection is completed.

【０００６】[0006]

【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の発明に係る超音波探触子では、管の
開口端部に形成された検査対象の管溶接部に向けて当該
管内から超音波ビームをスキャン可能な超音波振動子を
配置したプローブ本体を備え、このプローブ本体を上記
管溶接部の検査時に上記開口端部側から上記管内に挿入
するようにした超音波探触子において、上記プローブ本
体を上記管内に所定の接触媒質が毛管現象で浸透可能な
所定の隙間で非接触に挿入可能な挿入体で構成すると共
に、上記プローブ本体の管内挿入時に上記接触媒質を上
記開口端部側から上記隙間内を臨む位置に導入するため
の手段を設けたしたことを特徴とする。In order to achieve the above-mentioned object, in the ultrasonic probe according to the invention as defined in claim 1, the ultrasonic probe according to the present invention is directed toward the pipe welded portion to be inspected, which is formed at the open end of the pipe. An ultrasonic probe equipped with a probe main body in which an ultrasonic transducer capable of scanning an ultrasonic beam from inside the pipe is arranged, and the probe main body is inserted into the pipe from the opening end side when inspecting the pipe welded portion. In the child, the probe main body may be configured by an insert body that can be inserted into the tube in a non-contact manner with a predetermined gap that allows a predetermined couplant to penetrate by capillary action.
In order to introduce the contact medium from the opening end side to the position facing the inside of the gap when the probe body is inserted into the tube.
Is provided .

【０００７】「隙間の間隔」は、超音波ビームの入射点
の位置（高さ）に接触媒質が毛管現象で浸透可能な間
隔、例えば１ｍｍ以下の間隔が望ましく、これをプロー
ブ本体の直径を調整して設定する。「接触媒質」は、上
記隙間内を毛管現象で浸透可能な水等の粘性が低く且つ
表面張力が大きい液体が望ましい。The "gap" is preferably such that the contact medium can permeate the position (height) of the incident point of the ultrasonic beam by capillary action, for example, an interval of 1 mm or less, which is adjusted by adjusting the diameter of the probe body. And set. The "contact medium" is preferably a liquid having a low viscosity and a large surface tension, such as water, which can permeate through the gap by the capillary phenomenon.

【０００８】そこで、請求項２及び３記載の発明では、
前記所定の接触媒質を所定の粘性を有する水等の液体と
し、請求項４記載の発明では、前記隙間の間隔を１ｍｍ
以下としてある。これにより、水等の液体が隙間内に毛
管現象で自動的に浸透し且つその液体の膜が表面張力で
安定して形成されるため、超音波振動子からの超音波ビ
ームの入射点を常に液体で満たすことができ、管溶接部
の検査対象箇所に向けて超音波ビームを確実に入射可能
となる。Therefore, in the inventions according to claims 2 and 3,
The predetermined contact medium is a liquid such as water having a predetermined viscosity, and in the invention according to claim 4, the gap is 1 mm.
It is as below. As a result, a liquid such as water automatically permeates into the gap by capillary action and a film of the liquid is stably formed by surface tension, so that the point of incidence of the ultrasonic beam from the ultrasonic transducer is always maintained. It can be filled with a liquid, and the ultrasonic beam can be reliably incident on the inspection target portion of the pipe weld.

【０００９】請求項５記載の発明では、前記水を貯える
貯水部を備え、この貯水部を前記プローブ本体の管内挿
入時に前記管の開口端部から前記隙間内を臨む状態で当
該プローブ本体に取り付けている。「貯水部」は、例え
ば貯水可能な空間を有する容器体で構成し、その容器体
を押し付け力で変形可能な柔軟性を有するゴムや樹脂等
で形成することが望ましい。According to a fifth aspect of the present invention, there is provided a water storage portion for storing the water, and the water storage portion is attached to the probe main body so as to face the inside of the gap from the open end of the pipe when the probe main body is inserted into the pipe. ing. It is desirable that the “water storage part” is formed of, for example, a container body having a space capable of storing water, and is formed of rubber or resin having flexibility such that the container body can be deformed by pressing force.

【００１０】請求項６記載の発明では、前記貯水部は、
変形能を有し且つ前記水を吸収可能な吸収体を備え、こ
の吸収体を前記プローブ本体の管内挿入時に前記開口端
部側で変形自在に押し付けて固定できるように構成した
ことを特徴とする。「吸収体」としては、例えばスポン
ジや脱脂綿等が望ましく、予め水を吸収させ、プローブ
本体の管内挿入時に開口端部側で押し付けて変形させる
ことで、水を隙間内に導入する。According to a sixth aspect of the invention, the water reservoir is
An absorber having a deformability and capable of absorbing the water was provided, and the absorber was configured to be deformably pressed and fixed at the opening end side when the probe body was inserted into the pipe .
It is characterized by As the "absorber", for example, sponge, absorbent cotton, etc. are desirable, and water is introduced in advance into the gap by absorbing water in advance and pressing and deforming it at the opening end side when inserting the probe body into the tube.

【００１１】請求項７記載の発明では、前記貯水部に通
流可能に連結される外部容器を備えている。「外部容
器」を用いることにより、貯水部内に水を常時、供給で
きるため、例えば連続検査時等に貯水部内の水が消費さ
れる場合に有効となる。According to a seventh aspect of the present invention, there is provided an external container which is connected to the water storage portion so as to be able to flow therethrough. By using the "external container", water can be constantly supplied into the water storage unit, and therefore, it is effective when the water in the water storage unit is consumed during, for example, continuous inspection.

【００１２】請求項８記載の発明では、前記プローブ本
体の軸方向の前記超音波振動子を配置した位置よりも先
端側の外周部に円周方向に沿って溝を設けている。
「溝」は、その位置を越えて接触媒質が管内の奥側に浸
透しないように毛管現象を抑制可能な堰としての深さ及
び幅を考慮に入れて形成することが望ましい。According to the eighth aspect of the present invention, a groove is provided along the circumferential direction on the outer peripheral portion on the tip side of the position where the ultrasonic transducer is disposed in the axial direction of the probe main body.
The "groove" is preferably formed in consideration of the depth and width as a weir capable of suppressing the capillarity so that the couplant does not penetrate into the inside of the tube beyond its position.

【００１３】請求項９記載の発明では、前記プローブ本
体の軸方向の前記溝を設けた位置よりも先端側の外周部
に柔軟性を有するリング体を設けている。「リング体」
としては、ゴム等のパッキンが望ましく、その寸法を管
内の内側表面と接触するように調整すれば、検査終了時
に管内からプローブ本体を引き抜くと同時に隙間内に付
着した接触媒質をリング体で除去及び回収できる。According to a ninth aspect of the invention, a flexible ring body is provided on the outer peripheral portion of the probe main body on the tip side of the axial direction of the groove. "Ring body"
For this, packing such as rubber is desirable, and if the dimensions are adjusted so as to make contact with the inner surface of the pipe, the probe body is pulled out from the pipe at the end of the inspection, and at the same time the contact medium adhering in the gap is removed by a ring Can be collected.

【００１４】請求項１０記載の発明に係る管溶接部検査
装置では、請求項１乃至９の内のいずれか１項記載の超
音波探触子と、前記プローブ本体の管内挿入時に前記隙
間内に浸透した接触媒質を介して超音波振動子から前記
管溶接部に向けて超音波ビームをスキャンさせることに
より、管溶接部検査用の超音波データを取得する手段と
を備えている。According to a tenth aspect of the present invention, there is provided a pipe welded portion inspection apparatus, wherein the ultrasonic probe according to any one of the first to ninth aspects and the probe main body are provided in the gap when the probe body is inserted into the pipe. And a means for acquiring ultrasonic data for inspecting a pipe weld by scanning an ultrasonic beam from the ultrasonic transducer toward the pipe weld through the penetrating contact medium.

【００１５】請求項１１記載の発明に係る管溶接部検査
装置では、超音波振動子を内蔵したプローブ本体を検査
対象の管溶接部が形成された管内に所定の接触媒質が毛
管現象で浸透可能な所定の隙間で非接触に挿入し、その
隙間内に前記プローブ本体が挿入される管の開口端部側
から前記所定の接触媒質を毛管現象で浸透させると共
に、その隙間内に浸透した接触媒質を介して上記超音波
振動子から上記管溶接部に向けて超音波ビームをスキャ
ンさせることにより、管溶接部検査用の超音波データを
取得することを特徴とする。In the pipe welded portion inspection apparatus according to the present invention, a probe main body having an ultrasonic transducer built therein is provided with a predetermined contact medium in a pipe in which a pipe welded portion to be inspected is formed.
Inserted in a non-contact manner at a predetermined gap that can penetrate by the pipe phenomenon, and the probe main body is inserted into the gap at the open end side of the pipe.
From the ultrasonic transducer toward the pipe welding portion through the contact medium that has penetrated into the gap, and the ultrasonic beam is scanned from the ultrasonic transducer toward the pipe welding portion. It is characterized by acquiring ultrasonic data for inspection.

【００１６】[0016]

【発明の実施の形態】以下、この発明の一実施形態を図
１に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.

【００１７】図１に示す管溶接部検査装置は、給水加熱
器等の管Ａ１の開口端部で互いに溶接固定された管Ａ１
と管板Ａ２との所定の管溶接部Ａ３を超音波探傷試験法
により検査するもので、管検査用の内挿型の超音波探触
子１（「斜角探触子」ともいう）と、この超音波探触子
１が接続される装置本体２とを装備している。この内、
装置本体２は、図示しない入力器やモニタ等の所定の機
器類や制御回路等を一体に又は別体に装備した構成で、
超音波探触子１のスキャン制御や管溶接部Ａ３の超音波
データ（探傷情報等）の画面表示等の所定の動作を実行
するようになっている。The pipe welded portion inspection apparatus shown in FIG. 1 has a pipe A1 welded and fixed to each other at the open ends of the pipe A1 such as a feed water heater.
A predetermined welded portion A3 of the pipe and the tube plate A2 is inspected by an ultrasonic flaw detection test method, and is an insertion type ultrasonic probe 1 for pipe inspection (also referred to as a “bevel probe”). , And an apparatus main body 2 to which the ultrasonic probe 1 is connected. Of this,
The device body 2 has a configuration in which predetermined devices such as an input device and a monitor, which are not shown, and a control circuit are integrally or separately provided,
Predetermined operations such as scan control of the ultrasonic probe 1 and screen display of ultrasonic data (flaw detection information, etc.) of the pipe welded portion A3 are executed.

【００１８】超音波探触子１は、管Ａ１内の軸方向ＡＸ
に対して斜めの角度（斜角）で超音波ビームをスキャン
可能な超音波振動子３と、この超音波振動子３を内蔵す
るプローブ本体４と、このプローブ本体４を支持するス
トッパ５と、接触媒質用の水６を貯える貯水部（容器）
７とを備える。この内、超音波振動子３には、図示しな
い所定の駆動回路や信号処理回路等が接続されている。The ultrasonic probe 1 has an axial direction AX in the tube A1.
An ultrasonic transducer 3 capable of scanning an ultrasonic beam at an oblique angle (oblique angle), a probe main body 4 incorporating the ultrasonic transducer 3, and a stopper 5 supporting the probe main body 4. Water storage part (container) for storing water 6 for couplant
7 and 7. Among them, the ultrasonic transducer 3 is connected with a predetermined driving circuit, a signal processing circuit, and the like, which are not shown.

【００１９】プローブ本体４は、管Ａ１内に挿入可能な
所定の外径Ｒ１を有する挿入体で成り、その挿入体の外
径Ｒ１と引き抜き加工等の造管方法で真円度が比較的良
好に製造された管Ａ１の内径Ｒ２とで定まる半径方向の
隙間（円周隙間）Ｄが所定の間隔ｒ（例えば，１ｍｍ以
下、望ましくは０．５ｍｍ以下）となるように挿入体が
形成されている（後述参照）。The probe body 4 is made of an insert body having a predetermined outer diameter R1 that can be inserted into the tube A1, and the outer diameter R1 of the insert body and a relatively good roundness by a pipe forming method such as drawing. The insert is formed so that the radial clearance (circumferential clearance) D defined by the inner diameter R2 of the manufactured pipe A1 is a predetermined distance r (for example, 1 mm or less, preferably 0.5 mm or less). (See below).

【００２０】ストッパ５は、プローブ本体４の管Ａ１内
での挿入量を定める所定の軸長Ｌ１を有する円筒状部材
で成り、その閉端部にプローブ本体４の基端側を挿通状
態で取り付け、その開口端部をプローブ本体４の管内挿
入時に管板Ａ２の壁面に押し当てることにより、プロー
ブ本体４を所定の挿入量で管Ａ１内に支持固定する。こ
こで、プローブ本体４の挿入量は、超音波ビームＢＥの
内の主ビームが超音波振動子４から管Ａ１の肉厚部を介
して管溶接部Ａ３の検査対象箇所に最も強く入射される
ときの入射点及び屈折角の条件に基づいて予め決定され
ている。The stopper 5 is a cylindrical member having a predetermined axial length L1 that determines the amount of insertion of the probe body 4 into the tube A1, and the proximal end side of the probe body 4 is attached to the closed end portion thereof in a inserted state. By pressing the open end of the probe body 4 against the wall surface of the tube plate A2 when inserting the probe body 4 into the tube, the probe body 4 is supported and fixed in the tube A1 with a predetermined insertion amount. Here, regarding the insertion amount of the probe main body 4, the main beam of the ultrasonic beam BE is most strongly incident from the ultrasonic transducer 4 to the inspection target portion of the pipe welding portion A3 through the thick portion of the pipe A1. It is previously determined based on the conditions of the incident point and the refraction angle at that time.

【００２１】貯水部７は、プローブ本体４の基端側を挿
通状態でストッパ５内に同軸に配設される円筒状の容器
体で成り、その開口端部がプローブ本体４の管内挿入時
に管Ａ１の開口端部から隙間Ｄ内を臨む状態でプローブ
本体４の基端側に取り付けられている。The water storage section 7 is a cylindrical container body coaxially disposed in the stopper 5 with the base end side of the probe body 4 inserted, and the open end portion thereof is a pipe when the probe body 4 is inserted into the pipe. It is attached to the base end side of the probe body 4 in a state of facing the inside of the gap D from the opening end of A1.

【００２２】この貯水部７は、その外側が柔軟性及び変
形能を有するゴムや樹脂等から成る円筒状の貯水本体８
で構成され、この貯水本体８内に柔軟性及び吸水性を有
するスポンジや脱脂綿等の吸収体（吸水体）９を取り付
け、その軸長をストッパ５の軸方向のトップ側端面から
所定の長さＬ２分、突出する状態で製作した構成で、そ
の突出部分をプローブ本体４の挿入時の押し付け力で変
形させることにより、吸収体９内から隙間Ｄに向けて水
６を排出するようになっている。この水６は、隙間Ｄ内
を軸方向に沿って超音波ビームの入射点をカバー可能な
所定の液面高さまで毛管現象で浸透していく。The water storage portion 7 has a cylindrical water storage body 8 whose outer side is made of rubber or resin having flexibility and deformability.
In this water storage body 8, an absorbent body (water absorbent body) 9 such as a sponge and absorbent cotton having flexibility and water absorption is attached, and its axial length is set to a predetermined length from the top end surface in the axial direction of the stopper 5. It is configured to be projected for L2, and the protruding portion is deformed by the pressing force when the probe body 4 is inserted, so that the water 6 is discharged from the inside of the absorber 9 toward the gap D. There is. The water 6 penetrates in the gap D along the axial direction by a capillary phenomenon to a predetermined liquid surface height capable of covering the incident point of the ultrasonic beam.

【００２３】ここで、毛管現象に基づく隙間Ｄの間隔の
設定例を説明する。Here, an example of setting the gap D based on the capillary phenomenon will be described.

【００２４】一般に、毛管現象による液体の引き込み量
は、隙間の間隔が小さいほど多く、その液面高さは平行
平板が成す隙間の場合には液体の比凝集力で決定される
ことが知られている。即ち、液体の比凝集力をａ2 （ｍ
ｍ2 ）、その接触角をθ（゜）、平行平板が成す隙間の
間隔をｒ（ｍｍ）、液面高さをｈ（ｍｍ）としたとき、
ａ2 、θ、ｒ、ｈの夫々には、It is generally known that the amount of liquid drawn in by capillary action increases as the distance between the gaps decreases, and the liquid level height is determined by the specific cohesive force of the liquid in the case of the gap formed by the parallel flat plates. ing. That is, the specific cohesive force of the liquid is a 2 (m
m 2 ), the contact angle is θ (°), the gap between the parallel plates is r (mm), and the liquid level is h (mm),
For each of a 2 , θ, r, and h,

【数１】ｒｈ／ｃｏｓθ＝ａ2 の関係式が成立する（例えば、日本非破壊検査協会発行
浸透探傷試験III Ｐ９参照）。[Number 1] of the relationship rh / cosθ = a 2 is established (see, for example, penetrant III P9 issue Japan non-destructive Inspection Association).

【００２５】例えば、液体として水を想定すると、ａ2
＝１４．９９ｍｍ2 であるため、θ＝０゜の条件でｈ＝
２ｍｍとしたとき、上記［数１］式からｈ＝７．５ｍ
ｍ、同じくθ＝０゜でｈ＝１ｍｍとしたとき、ｈ＝１
５．０ｍｍとなる。この平行平板が成す隙間の解析結果
は、比較的小さい間隔に設定された円周平行隙間の場合
に置き換えても殆ど同様となる。For example, assuming water as the liquid, a 2
= 14.99 mm 2 , h = 0 °
When 2 mm, h = 7.5 m from the above [Formula 1]
m, also when θ = 0 ° and h = 1 mm, h = 1
It will be 5.0 mm. The analysis results of the gap formed by the parallel flat plates are almost the same even if the gap is replaced with the circumferential parallel gap set to a relatively small gap.

【００２６】そこで、この発明では、平行平板が成す隙
間の解析例をプローブ本体４と管Ａ１とが成す円周隙間
に適用した。つまり、接触媒質として水６を選定し、円
周隙間Ｄの間隔ｒを「１ｍｍ以下」に設定すれば、仮に
プローブ本体４を垂直に配置したとしても、毛管現象で
水６が隙間Ｄ内を管板Ａ２の端面から液面高さが約１５
ｍｍの範囲まで進入することになる。Therefore, in the present invention, the analysis example of the gap formed by the parallel plates is applied to the circumferential gap formed by the probe main body 4 and the tube A1. That is, if the water 6 is selected as the contact medium and the interval r of the circumferential gap D is set to "1 mm or less", the water 6 will flow in the gap D due to the capillary phenomenon even if the probe body 4 is arranged vertically. The liquid level from the end surface of the tube sheet A2 is about 15
It will enter the range of mm.

【００２７】即ち、この液面高さの範囲まで管Ａ２の向
きに関係なく常に水６を満たすことができれば、プロー
ブ本体４の寸法を考慮しても実用上は十分である。実際
に、熱交換器等の伝熱管は肉厚が２ｍｍ程度のものが多
く、斜角探触子の代表的な屈折角の条件（７０゜）を想
定した場合には、管板Ａ２の端面から約６ｍｍの高さの
位置に超音波ビームＢＥの入射点が存在するためであ
る。That is, if the water 6 can be constantly filled up to this range of the liquid level regardless of the direction of the tube A2, it is practically sufficient even if the dimensions of the probe body 4 are taken into consideration. Actually, most heat transfer tubes such as heat exchangers have a wall thickness of about 2 mm, and assuming a typical angle of refraction of an oblique probe (70 °), the end surface of the tube sheet A2 is assumed. This is because the incident point of the ultrasonic beam BE exists at a height of about 6 mm from.

【００２８】次に、この実施形態の全体の作用を説明す
る。Next, the overall operation of this embodiment will be described.

【００２９】まず、超音波探触子１を用いた管溶接部Ａ
３の探傷試験の開始時に、ストッパ５が管板Ａ２の端面
に接触するまで管Ａ１内にプローブ本体４を挿入してい
くとする（図中の二点鎖線矢印ａ参照）。このとき、管
Ａ１とプローブ本体４とが成す隙間Ｄの間隔は、例えば
ｒ＝１ｍｍである。First, the pipe welded portion A using the ultrasonic probe 1
It is assumed that the probe body 4 is inserted into the tube A1 until the stopper 5 comes into contact with the end surface of the tube sheet A2 at the start of the flaw detection test of No. 3 (see the two-dot chain line arrow a in the figure). At this time, the gap D formed by the tube A1 and the probe body 4 is, for example, r = 1 mm.

【００３０】このプローブ挿入に際し、ストッパ５が管
板Ａ２の端面に接触する前に、貯水部７が管板Ａ２に接
触し、この状態で更にストッパ５が管板Ａ２の端面に接
触するまでプローブ本体４を挿入すると、貯水本体８及
び吸収体９が管溶接部Ａ３に押し当てられて変形してい
く（図中の二点鎖線矢印ｂ参照）。When the probe is inserted, the water reservoir 7 contacts the tube plate A2 before the stopper 5 contacts the end surface of the tube plate A2. In this state, the probe 5 is further contacted until the stopper 5 contacts the end surface of the tube plate A2. When the main body 4 is inserted, the water storage main body 8 and the absorber 9 are pressed against the pipe welded portion A3 to be deformed (see the two-dot chain line arrow b in the figure).

【００３１】このように吸収体９が変形すると、その内
部の水６が貯水本体８の開口部からプローブ本体４と管
が成す隙間Ｄに向けて滲み出し、これが管溶接部Ａ３の
コーナー部が狭くなる部分から隙間Ｄに沿って毛管現象
で自動的に管Ａ１の開口側から奥側に向けて超音波ビー
ムの入射点を十分にカバー可能な所定の液面高さ、即ち
ｈ＝１５ｍｍの位置まで引き込まれていく（図中の二点
鎖線矢印ｃ参照）。この水６の層は、表面張力で強固か
つ安定性良く保持される。When the absorber 9 is deformed in this way, the water 6 in the absorber 9 oozes out from the opening of the water storage body 8 toward the gap D formed by the probe body 4 and the pipe, which causes the corner portion of the pipe welded portion A3 to leak. A predetermined liquid level height that can sufficiently cover the incident point of the ultrasonic beam from the opening side of the tube A1 to the inner side by capillarity automatically along the gap D from the narrowed portion, that is, h = 15 mm. It is drawn to the position (see the double-dashed line arrow c in the figure). The layer of water 6 is held firmly and stably by the surface tension.

【００３２】この状態で、超音波探触子１を駆動させる
ことにより、隙間Ｄ内を毛管現象で浸透し且つその位置
が表面張力で保持された水６を介して超音波振動子３か
ら管溶接部Ａ３に向けて超音波ビームＢＥがスキャンさ
れ、管溶接部検査用の超音波データが取得される。In this state, by driving the ultrasonic probe 1, the ultrasonic transducer 3 is guided from the ultrasonic transducer 3 through the water 6 which has penetrated the gap D by capillarity and whose position is held by surface tension. The ultrasonic beam BE is scanned toward the welded portion A3, and ultrasonic data for pipe welded portion inspection is acquired.

【００３３】従って、この実施形態によれば、検査時に
管入口部を接触媒質で満たすだけで、超音波ビームの入
射点を含む必要な管内の隙間部分のみに容易に且つ安定
して水を供給でき、その結果、従来の接触媒質の過不足
による検査効率の低下を大幅に抑制できる。また、ポン
プ等の複雑で特別な外部の水供給装置（給水設備）を必
要としない分、管溶接部検査装置をトータルに簡素化で
きる。Therefore, according to this embodiment, by simply filling the inlet of the pipe with the couplant at the time of inspection, water can be easily and stably supplied only to the necessary gaps in the pipe including the incident point of the ultrasonic beam. As a result, the deterioration of the inspection efficiency due to the excess or deficiency of the conventional contact medium can be significantly suppressed. Further, since a complicated and special external water supply device (water supply equipment) such as a pump is not required, the pipe weld inspection device can be totally simplified.

【００３４】次に、この発明の別の実施形態を図２及ぶ
図３に基づいて説明する。Next, another embodiment of the present invention will be described with reference to FIGS.

【００３５】図２に示す別の実施形態に係る超音波探触
子１は、プローブ本体４の軸方向の超音波振動子３を配
置した位置よりも先端側の外周部にＶ型の溝１０を設
け、この溝１０の奥側の外周部に円周方向に沿ってゴム
等のパッキン（リング体）１１を取り付けたものであ
る。An ultrasonic probe 1 according to another embodiment shown in FIG. 2 has a V-shaped groove 10 on the outer peripheral portion on the tip side of the position where the ultrasonic transducer 3 in the axial direction of the probe body 4 is arranged. Is provided, and a packing (ring body) 11 made of rubber or the like is attached to the outer peripheral portion on the inner side of the groove 10 along the circumferential direction.

【００３６】従って、この実施形態によれば、上記効果
に加え、水６の浸透位置を溝１０で調整でき、管Ａ１内
を必要以上に濡らす事態を回避できる。また、プローブ
本体４を抜き去る際に管Ａ１に付着した水６をパッキン
１１で掻き取り、これを溝１０の中に貯えながら回収で
きるため、水の回収等の作業性がより一層向上すると共
に、検査終了後の管Ａ１内を清浄に維持できる利点もあ
る。Therefore, according to this embodiment, in addition to the above effects, the penetration position of the water 6 can be adjusted by the groove 10 and the situation where the inside of the pipe A1 is wetted more than necessary can be avoided. Further, when the probe body 4 is pulled out, the water 6 adhering to the pipe A1 can be scraped off by the packing 11, and the water can be collected while being stored in the groove 10, so that the workability of water collection and the like is further improved. There is also an advantage that the inside of the pipe A1 can be kept clean after the inspection is completed.

【００３７】図３に示す別の実施形態に係る超音波探触
子１は、貯水部７に細い水管１２を介して点滴用のビニ
ール容器等の外部容器１３を連結したものである。この
外部容器１３を設けない場合には、検査対象の管溶接部
Ａ３を連続的に多数検査する際に吸収体９内の水６が逐
次消費され、枯渇してしまう事態が想定される。An ultrasonic probe 1 according to another embodiment shown in FIG. 3 has an external container 13 such as a vinyl container for drip connected to a water reservoir 7 via a thin water pipe 12. If the external container 13 is not provided, it is assumed that the water 6 in the absorber 9 is successively consumed and exhausted when a large number of pipe welded portions A3 to be inspected are continuously inspected.

【００３８】従って、この実施形態によれば、上記効果
に加え、外部容器１３から水管１２を介して吸収体９に
連続的に水を供給できるため、特に連続検査時の水枯渇
事態を殆ど回避できる利点がある。Therefore, according to this embodiment, in addition to the above effects, water can be continuously supplied from the outer container 13 to the absorber 9 via the water pipe 12, so that the water depletion situation during continuous inspection can be largely avoided. There are advantages.

【００３９】なお、この実施形態の応用として、貯水部
５と外部容器１３の間にバルブ等の流量調整用の絞りを
設け、水管１２を細くして抵抗として作用させ、貯水部
７内の消費分の水を外部容器１３から水管１２を介して
主に毛管現象で自動的に少量づつ供給させる構成を採用
してもよい。この場合には、外部容器１３を所定の位
置、例えば検査位置とほぼ同じ高さに設置し、水管１２
を長めに設定すれば、例えば縦型給水加熱器等の管溶接
部を対象とした広範囲な検査を実施でき、検査効率をよ
り一層高めると共に、特別な給水設備を必要とせず、簡
単な機構で外部から吸収体９に安定して水を供給できる
利点もある。As an application of this embodiment, a throttle for adjusting the flow rate such as a valve is provided between the water storage section 5 and the outer container 13, and the water pipe 12 is made thin to act as a resistance to reduce the consumption in the water storage section 7. A configuration may be adopted in which a small amount of water is automatically supplied from the external container 13 via the water pipe 12 automatically in small amounts mainly by capillarity. In this case, the outer container 13 is installed at a predetermined position, for example, at substantially the same height as the inspection position, and the water pipe 12
If set to a long value, for example, a wide range of inspections can be carried out for pipe welded parts such as vertical water heaters, the inspection efficiency is further improved, and special water supply equipment is not required, and a simple mechanism is used. There is also an advantage that water can be stably supplied to the absorber 9 from the outside.

【００４０】[0040]

【発明の効果】以上説明したように、この発明によれ
ば、プローブ本体を管内に所定の隙間で非接触に挿入可
能な挿入体で構成し、その隙間の間隔を所定の接触媒質
が毛管現象で浸透可能なサイズに設定し、プローブ本体
の管内挿入時に接触媒質を管の開口端部側から隙間内を
臨む位置に導入することを要部とし、特に接触媒質に所
定の粘性を有する液体（水等）を採用し、隙間の間隔を
１ｍｍ以下に設定したため、超音波ビームの入射点を含
む検査に必要な管内の隙間部分のみに接触媒質を容易に
且つ安定して供給でき、その結果、従来の接触媒質に起
因した検査効率の低下を殆ど回避できる。As described above, according to the present invention, the probe main body is formed of the insert body which can be inserted into the tube in a predetermined gap without contact, and the gap of the gap is determined by the predetermined couplant. The main part is to introduce the contact medium from the opening end side of the tube to the position facing the inside of the tube when the probe body is inserted into the tube. (Water, etc.) is adopted and the gap distance is set to 1 mm or less, so that the couplant can be easily and stably supplied only to the gap portion in the tube necessary for the inspection including the incident point of the ultrasonic beam. Almost all the deterioration of the inspection efficiency due to the conventional contact medium can be avoided.

【００４１】また、検査時の接触媒質の隙間内への導入
に関しては、ポンプ等の複雑な水供給機構等は必要では
なく、例えば貯水部を設けるだけで済むため、超音波探
触子の構成を簡素に構築し且つ比較的安価に提供できる
と共に、例えば外部容器を用いて管溶接部の連続検査時
等に貯水部内の消費分の水を容易に且つ簡便に供給で
き、検査効率をより一層高めることができる。Further, regarding the introduction of the couplant into the gap at the time of inspection, a complicated water supply mechanism such as a pump is not required, and for example, only a water storage portion is provided, so that the ultrasonic probe is constructed. Can be simply constructed and can be provided at a relatively low cost, and the consumption water in the water reservoir can be easily and easily supplied, for example, during continuous inspection of the pipe weld using an external container, and inspection efficiency can be further improved. Can be increased.

【００４２】また、検査終了後の接触媒質の回収や除去
等に関しては、例えば溝をプローブ本体に設けるだけ
で、検査時の接触媒質の浸透位置を必要最小限に押さえ
て管内を不必要に汚す事態を回避できると共に、例えば
プローブ本体の溝の奥側にリング体を取り付けるだけ
で、プローブ本体の引抜時に管内に付着した接触媒質を
簡便に回収でき、このような簡単な構造で検査終了後の
管内（検査体）を常に清浄に維持でき、その結果、作業
性が大幅に向上するようになる。Regarding the recovery and removal of the contact medium after the inspection, for example, only by providing a groove in the probe body, the permeation position of the contact medium at the time of the inspection is suppressed to the necessary minimum and the inside of the tube is unnecessarily soiled. In addition to avoiding the situation, for example, by simply attaching a ring body to the inner side of the groove of the probe body, the contact medium adhering to the inside of the tube when the probe body is pulled out can be easily collected. The inside of the pipe (inspection body) can always be kept clean, and as a result, workability is greatly improved.

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

【図１】この発明の実施形態に係る管溶接部検査装置の
要部構成を示す概略断面図。FIG. 1 is a schematic cross-sectional view showing the main configuration of a pipe welded portion inspection apparatus according to an embodiment of the present invention.

【図２】別の実施形態に係る超音波探触子の要部構成を
示す概略断面図。FIG. 2 is a schematic cross-sectional view showing the main configuration of an ultrasonic probe according to another embodiment.

【図３】別の実施形態に係る超音波探触子の要部構成を
説明する図で、図１中のＡ−Ａ線からプローブ挿入側を
見た概略図。FIG. 3 is a diagram for explaining a configuration of a main part of an ultrasonic probe according to another embodiment, and is a schematic view of the probe insertion side taken along the line AA in FIG. 1.

【符号の説明】[Explanation of symbols]

１ 超音波探触子 ２ 装置本体 ３ 超音波振動子 ４ プローブ本体 ５ ストッパ ６ 水（接触媒質） ７ 貯水部 ８ 貯水本体 ９ 吸収体 １０ 溝 １１ パッキン（リング体） １２ 水管 １３ 外部容器 1 Ultrasonic probe 2 device body 3 Ultrasonic transducer 4 probe body 5 stopper 6 Water (contact medium) 7 water storage 8 water storage body 9 absorber 10 grooves 11 Packing (ring body) 12 water tubes 13 External container

Claims (11)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 管の開口端部に形成された検査対象の管
溶接部に向けて当該管内から超音波ビームをスキャン可
能な超音波振動子を配置したプローブ本体を備え、この
プローブ本体を上記管溶接部の検査時に上記開口端部側
から上記管内に挿入するようにした超音波探触子におい
て、上記プローブ本体を上記管内に所定の接触媒質が毛
管現象で浸透可能な所定の隙間で非接触に挿入可能な挿
入体で構成すると共に、上記プローブ本体の管内挿入時
に上記接触媒質を上記開口端部側から上記隙間内を臨む
位置に導入するための手段を設けたしたことを特徴とす
る超音波探触子。1. A probe main body having an ultrasonic transducer capable of scanning an ultrasonic beam from the inside of the pipe, which is formed toward the pipe welding portion to be inspected, which is formed at the open end of the pipe. In an ultrasonic probe adapted to be inserted into the tube from the opening end side at the time of inspecting a pipe weld, the probe body is placed in the tube and a predetermined contact medium is applied to the probe body.
Together comprise a insertable inserts in a non-contact at a predetermined gap can be infiltrated with a tube phenomenon, the coupling medium when the tube inserted in the probe body for introduction into a position facing the inside of the gap from the opening end portion side An ultrasonic probe characterized by being provided with the means of . 【請求項２】 前記接触媒質は、所定の粘性を有する液
体である請求項１記載の超音波探触子。2. The ultrasonic probe according to claim 1, wherein the contact medium is a liquid having a predetermined viscosity. 【請求項３】 前記液体は、水である請求項２記載の超
音波探触子。3. The ultrasonic probe according to claim 2, wherein the liquid is water. 【請求項４】 前記隙間の間隔は、１ｍｍ以下である請
求項３記載の超音波探触子。4. The ultrasonic probe according to claim 3, wherein the gap is 1 mm or less. 【請求項５】 前記水を貯える貯水部を備え、この貯水
部を前記プローブ本体の管内挿入時に前記管の開口端部
側から前記隙間内を臨む状態で当該プローブ本体に取り
付けた請求項３又は４記載の超音波探触子。5. The water storage part for storing the water is provided, and the water storage part is attached to the probe main body so as to face the inside of the gap from the opening end side of the pipe when the probe main body is inserted into the pipe. 4. The ultrasonic probe according to 4. 【請求項６】 前記貯水部は、変形能を有し且つ前記水
を吸収可能な吸収体を備え、この吸収体を前記プローブ
本体の管内挿入時に前記開口端部側で変形自在に押し付
けて固定できるように構成した請求項５記載の超音波探
触子。6. The water storage section includes an absorber having a deformability and capable of absorbing the water, and the absorber is fixed by being deformably pressed at the opening end side when the probe body is inserted into the pipe. The ultrasonic probe according to claim 5, wherein the ultrasonic probe is configured so as to be capable . 【請求項７】 前記貯水部に通流可能に連結される外部
容器を備えた請求項５又は６記載の超音波探触子。7. The ultrasonic probe according to claim 5, further comprising an external container that is connected to the water storage portion so as to be able to flow therethrough. 【請求項８】 前記プローブ本体の軸方向の前記超音波
振動子を配置した位置よりも先端側の外周部に円周方向
に沿って溝を設けた請求項１記載の超音波探触子。8. The ultrasonic probe according to claim 1, wherein a groove is provided along the circumferential direction on the outer peripheral portion of the probe body on the tip side of the position where the ultrasonic transducer is arranged in the axial direction. 【請求項９】 前記プローブ本体の軸方向の前記溝を設
けた位置よりも先端側の外周部に柔軟性を有するリング
体を設けた請求項８記載の超音波探触子。9. The ultrasonic probe according to claim 8, wherein a flexible ring body is provided on an outer peripheral portion of the probe main body on a tip side of a position where the groove is provided in the axial direction. 【請求項１０】 請求項１乃至９の内のいずれか１項記
載の超音波探触子と、前記プローブ本体の管内挿入時に
前記隙間内に浸透した接触媒質を介して超音波振動子か
ら前記管溶接部に向けて超音波ビームをスキャンさせる
ことにより、管溶接部検査用の超音波データを取得する
手段とを備えたことを特徴とする管溶接部検査装置。10. The ultrasonic probe according to any one of claims 1 to 9 and the ultrasonic transducer from the ultrasonic transducer via a contact medium that penetrates into the gap when the probe body is inserted into a tube. An apparatus for inspecting a welded portion of a pipe, comprising means for acquiring ultrasonic data for inspecting the welded portion of a pipe by scanning an ultrasonic beam toward the welded portion of the pipe. 【請求項１１】 超音波振動子を内蔵したプローブ本体
を検査対象の管溶接部が形成された管内に所定の接触媒
質が毛管現象で浸透可能な所定の隙間で非接触に挿入
し、その隙間内に前記プローブ本体が挿入される管の開
口端部側から前記所定の接触媒質を毛管現象で浸透させ
ると共に、その隙間内に浸透した接触媒質を介して上記
超音波振動子から上記管溶接部に向けて超音波ビームを
スキャンさせることにより、管溶接部検査用の超音波デ
ータを取得することを特徴とする管溶接部検査方法。11. A predetermined catalyst for contacting a probe main body containing an ultrasonic transducer in a pipe in which a pipe welding portion to be inspected is formed.
Insert non-contact in a predetermined gap that allows the quality to penetrate by capillary action , and open the tube into which the probe body is inserted
By infiltrating the predetermined couplant from the mouth end side by capillarity, and scanning an ultrasonic beam from the ultrasonic transducer toward the pipe weld through the couplant that has penetrated into the gap. And a method for inspecting a welded pipe, wherein ultrasonic data for inspecting a welded pipe is acquired.
JP12877596A 1996-05-23 1996-05-23 Ultrasonic probe, pipe weld inspection apparatus and pipe weld inspection method Expired - Fee Related JP3533288B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12877596A JP3533288B2 (en) 1996-05-23 1996-05-23 Ultrasonic probe, pipe weld inspection apparatus and pipe weld inspection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12877596A JP3533288B2 (en) 1996-05-23 1996-05-23 Ultrasonic probe, pipe weld inspection apparatus and pipe weld inspection method

Publications (2)

Publication Number Publication Date
JPH09311127A JPH09311127A (en) 1997-12-02
JP3533288B2 true JP3533288B2 (en) 2004-05-31

Family

ID=14993168

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12877596A Expired - Fee Related JP3533288B2 (en) 1996-05-23 1996-05-23 Ultrasonic probe, pipe weld inspection apparatus and pipe weld inspection method

Country Status (1)

Country Link
JP (1) JP3533288B2 (en)

Also Published As

Publication number Publication date
JPH09311127A (en) 1997-12-02

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