JPH01191052A - Nondestructive detecting method for defect of metallic joint of different kind - Google Patents
Nondestructive detecting method for defect of metallic joint of different kindInfo
- Publication number
- JPH01191052A JPH01191052A JP63014595A JP1459588A JPH01191052A JP H01191052 A JPH01191052 A JP H01191052A JP 63014595 A JP63014595 A JP 63014595A JP 1459588 A JP1459588 A JP 1459588A JP H01191052 A JPH01191052 A JP H01191052A
- Authority
- JP
- Japan
- Prior art keywords
- echo
- defect
- point
- corrosion
- contactor
- 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
- 230000007547 defect Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title description 16
- 239000000523 sample Substances 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000008034 disappearance Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 150000002739 metals Chemical class 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000002950 deficient Effects 0.000 description 12
- 238000002592 echocardiography Methods 0.000 description 7
- 230000001066 destructive effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000009376 nuclear reprocessing Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高腐食性流体を取扱うプラントの異種金属継手
等の境界に発生するナイフェツジ腐食等の欠陥の超音波
タンデム法による非破壊的検出方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a non-destructive method for detecting defects such as knife corrosion occurring at the boundaries of dissimilar metal joints in plants handling highly corrosive fluids using an ultrasonic tandem method. Regarding.
高腐食性流体を取扱うプラントの配管等には第１表に示
すように種類の異なる金属の各種溶接継手が使用されて
いる。As shown in Table 1, various welded joints made of different metals are used for piping in plants that handle highly corrosive fluids.
第１表
この異種金属継手のうち第６図に示すような形状で、か
つその管内を腐食性のきわめて強い流体が流、れるもの
は配管１と溶接金属２との境界４や配管３と溶接金属２
との境界５にナイフェツジ腐食６が発生する場合がある
。Table 1 Among these dissimilar metal joints, those with the shape shown in Figure 6 and through which highly corrosive fluid flows are those that are welded to the boundary 4 between pipe 1 and weld metal 2 or to pipe 3. metal 2
Knife corrosion 6 may occur at the boundary 5 between the two.
このナイフェツジ腐食の非破壊的検出には第５図第６図
に示す超音波探傷試験が極めて有望と考えられたが、斜
角探触子７を１個使用する従来の斜角探傷法では、異種
金属継手の場合無欠陥でも第５図に示したように無欠陥
反射エコー（ト）が常だ出現する。欠陥が存在する場合
も会＃吋ミ第６図に示すように欠陥エコー（イ）が出現
する。したがって腐食６からの欠陥反射エコー（イ）と
無欠陥反射エコー（ト）との識別が探傷器１０のＣＲＴ
ＩＩの画面上では極めて困難であった。The ultrasonic flaw detection test shown in Figs. 5 and 6 was considered to be extremely promising for non-destructive detection of this knife corrosion, but the conventional angle angle flaw detection method using one angle probe 7 In the case of dissimilar metal joints, even if there are no defects, defect-free reflection echoes (g) always appear as shown in FIG. Even when a defect exists, a defect echo (A) appears as shown in FIG. 6. Therefore, the CRT of the flaw detector 10 can distinguish between the defective reflected echo (a) from the corrosion 6 and the non-defective reflected echo (g).
It was extremely difficult to do so on the II screen.
第７図【示すように斜角探触子の代りに垂直探触子１２
を使用してもナイフェツジ腐食６の先端部１３は極めて
鋭いため、ナイフェツジ腐食６直上からの探傷でも反射
エコーが得にくく、ナイフェツジ腐食６の検出は困難で
あった。FIG. 7 [Vertical probe 12 instead of angle probe as shown]
Even if the knife corrosion 6 is used, the tip 13 of the knife corrosion 6 is extremely sharp, so it is difficult to obtain a reflected echo even in flaw detection from directly above the knife corrosion 6, making it difficult to detect the knife corrosion 6.
前述の１個の斜角探触子を用いる従来の横波探傷法や、
同じく１個の探触子を用いる縦波探傷法でも、此の種の
異種金属溶接継手からは欠陥（ナイフェツジ腐食）の有
無ｋかかわらす常に反射エコーが帰ってくるため、欠陥
の識別が困難であるという問題点があった。The conventional shear wave flaw detection method using a single angle probe as described above,
Even with the longitudinal wave flaw detection method, which uses a single probe, it is difficult to identify defects because reflected echoes are always returned from this type of dissimilar metal welded joint, regardless of whether there is a defect (knife corrosion). There was a problem.
本発明はか＼る現状に鑑みなされたもので、欠陥の識別
が容易な異種金属継手の欠陥の非破壊的検出方法を提供
することを目的としたものである。The present invention was made in view of the current situation, and an object of the present invention is to provide a non-destructive method for detecting defects in dissimilar metal joints, which makes it easy to identify defects.
本発明は異種金属継手に向って横波集束型超音波探触子
２個をそれぞれ送信用および受信用として前後（タンデ
ム）ＶＣ配置し前記送信用探触子と前記受信用探触子と
を相互に反対方向にそれぞれ等距離の位置に移動して前
記異種金属間の境界からの超音波反射エコーの消失およ
び反射エコーの所定出現位置以外の位置での出現を検出
することを特徴とする異種金属継手の欠陥の非破壊的検
出方法を提案するものである。In the present invention, two transverse wave focusing ultrasonic probes are arranged in front and back (tandem) for transmitting and receiving, respectively, toward a dissimilar metal joint, and the transmitting probe and the receiving probe are mutually connected. Dissimilar metals are moved in opposite directions to positions equidistant from each other to detect the disappearance of the ultrasonic reflected echo from the boundary between the dissimilar metals and the appearance of the reflected echo at a position other than a predetermined appearance position. This paper proposes a non-destructive method for detecting defects in joints.
横波集束型超音波探触子２個を前後（タンデム）に配置
し反射エコーの出現を追跡する。探触子を互に反対方向
に等距離動かした場合、無欠陥時には常に超音波ビーム
路程が一定であるため反射エコーは出現するが、欠陥が
ある場合は超音波ビーム路程が長くなるため反射エコー
は出現しないで消失する。この現象を利用して異種金属
継手の欠陥の有無を検出する。Two focused transverse wave ultrasound probes are placed in front and behind (tandem) to track the appearance of reflected echoes. When the probes are moved equidistantly in opposite directions, a reflected echo will appear because the ultrasound beam path is always constant when there is no defect, but if there is a defect, the ultrasound beam path becomes longer and a reflected echo will appear. disappears without appearing. This phenomenon is used to detect the presence or absence of defects in dissimilar metal joints.
本発明の一実施例を第１図、第２図、第３図によシ説明
する。An embodiment of the present invention will be explained with reference to FIGS. 1, 2, and 3.
第１図は無欠陥の異種金属継手の場合である。FIG. 1 shows the case of a defect-free dissimilar metal joint.
本発明の方法では２個の同一特性の斜角探触子を前後（
タンデム）配置とすることを特徴としている。In the method of the present invention, two angle probes with the same characteristics are placed front and back (
It is characterized by a tandem) arrangement.
第１図において送信探触子１５をＰ点に受信探触子１６
をＱ点に配置すると超音波はＰ点→境界５→底面１４→
Ｑ点の点線の経路をたどり同探触子１５．１６に接続さ
れた探傷器１０のＣＲＴＩＩの画面上では受信エコー（
イ）として時間軸上の位置に）に出現する。しかし第１
図は無欠陥の場合であるため、両探触子金相互に反対方
向に等距離Ｘだけ移動し、すなわち送信探触子１５をＰ
点からＲ点に移動し、受信探触子１６をＱ点から８点に
移動しそれぞれＲ点と８点に位置させても（超音波はＳ
点→境界５→底面１４→Ｒ点の実線の経路をたどる）探
傷器１０のＣＲＴＩＩの画面でのエコー（ロ）の出現位
置は移動前と全く同じ位置に）となる。In FIG. 1, the transmitting probe 15 is placed at point P, and the receiving probe 16 is
When placed at point Q, the ultrasonic wave moves from point P → boundary 5 → bottom surface 14 →
Following the dotted line path of point Q, the received echo (
b) appears at the position on the time axis). But the first
Since the figure shows a case with no defects, both probe metals are moved by an equal distance X in opposite directions, that is, the transmitting probe 15 is moved to P
Even if the receiving probe 16 is moved from point Q to point 8 and positioned at point R and point 8, respectively (the ultrasonic wave is
Follow the solid line path of point → boundary 5 → bottom surface 14 → point R) The appearance position of the echo (b) on the CRT II screen of the flaw detector 10 is exactly the same as before the movement).
次にナイフェツジ腐食６が存在する欠陥有シの場合につ
いて第２図によシ説明する。Next, the case where there is a defect in which knife corrosion 6 exists will be explained with reference to FIG.
まず送信用探触子１５と受信用探触子１６を前後（タン
デム）配置しエコーの出現位置を求める。もしも欠陥が
なければ、（もしくは図のような欠陥がまだ進展してい
ない位置では）エコー（イ）は第１図と同じ時間軸の位
置に）に出現する。First, the transmitting probe 15 and the receiving probe 16 are arranged in tandem, and the position where the echo appears is determined. If there is no defect (or at a position where the defect has not yet developed as shown in the figure), the echo (A) will appear at the same time axis position as in Figure 1).
次に測探触子を相互に反対方向に等距離Ｘだけ移動し送
信探触子１５をＰ点からＲ点に移動し、受信探触子１６
をＱ点から８点に移動しても（ホ）の位置にはエコー（
ロ）は出現しないか、もしくはきわめて低くなる。この
ようにしてエコーの消失により欠陥の存在を検出するこ
とができる。Next, the measuring probes are moved in opposite directions by an equal distance X, the transmitting probe 15 is moved from point P to point R, and the receiving probe 16
Even if you move from point Q to point 8, there is an echo (
b) either does not appear or becomes extremely low. In this way, the presence of a defect can be detected by the disappearance of the echo.
なお、この場合送信探触子１５の位置をＲ点に固定した
ま＼受信探触子１６の位置を８点からＴ点までの距離Ｙ
だけ移動すると、反射エコー（ハ）は大きくなり、かつ
探傷器１０のＣＲＴＩＩの画面の時間軸上の位置（へ）
に出現する。In this case, while fixing the position of the transmitting probe 15 at point R, the position of the receiving probe 16 is determined by the distance Y from point 8 to point T.
When the reflected echo (C) is moved by
Appears in
このエコー位置の差（（へ）と（ホ）の差）は欠陥があ
る場合とない場合の超音波のビーム路程の差を示すこと
になるので、この差の存在が逆に欠陥特にナイフェツジ
腐食の存在の証明となる。This difference in echo position (difference between (e) and (e)) indicates the difference in the beam path of the ultrasonic waves when there is a defect and when there is no defect. proves the existence of
上述のエコー位置の差を自動識別する方法を第３図によ
シ説明する。A method for automatically identifying the above-mentioned difference in echo position will be explained with reference to FIG.
較正用無欠陥金属継手からの反射超音波エコー（イ）は
ＣＲＴＩＩ上の画面のに）の位置に出現する。この位置
の距離（時間）ａは送信波側）の立上り位置（史を基準
として計測する。この計測は欠陥反射エコー出現予想範
囲にゲート２３をかけることで可能となる。The reflected ultrasonic echo (a) from the defect-free metal joint for calibration appears at the position (a) on the CRTII screen. The distance (time) a of this position is measured based on the rising position (history) of the transmitted wave side. This measurement is made possible by applying the gate 23 to the range in which defective reflected echoes are expected to appear.
即ちこのゲート２３内に出現した反射エコーの位置は探
傷器１０内でデジタル化しａとして記憶回路に入力すれ
ば記憶することができるようになっている。That is, the position of the reflected echo appearing within this gate 23 can be stored by digitizing it within the flaw detector 10 and inputting it into a storage circuit as a.
ついで欠陥信号を検知した場合は反射エコー（ハ）は無
欠陥の距離ａではなく距離すに出現する、この場合もそ
の距離は出力端子２４から記憶回路２５に入力される。Then, when a defect signal is detected, a reflected echo (C) appears at distance A instead of the defect-free distance A. In this case as well, that distance is input from the output terminal 24 to the storage circuit 25.
ａとｂとを減算回路２７に入力するとそこでｂ −ａの
計算が行われるこ１も
と表示製鉄はｂ −ａの値を表示することかで陥のある
場合はｂ −ａの値すなわちａよりかなり小さい値を示
すので、欠陥を容易に識別することができる。When a and b are input to the subtraction circuit 27, the calculation of b - a is performed there. 1. If there is a problem with displaying the value of b - a, the value of b - a, that is, a Since the value is much smaller than that shown in the figure, defects can be easily identified.
本実施例では反射エコーのめ現を探傷器のＣＲＴの時間
軸上に比較表示する例を示したが、本発明はこれに限定
されるものではない。即ち反射エコーの出現や消失を自
動的に検知できる装置を構成すれば上記識別装置と同様
に欠陥を識別できる。Although this embodiment shows an example in which the appearance of reflected echoes is displayed for comparison on the time axis of the CRT of a flaw detector, the present invention is not limited to this. That is, by configuring a device that can automatically detect the appearance and disappearance of reflected echoes, defects can be identified in the same way as the above-mentioned identification device.
本実施例の方法の探傷手順のフローチャートを第４図に
示す。欠陥有無の判定は本フローチャートを使用すると
容易だ可能となる。A flowchart of the flaw detection procedure of the method of this embodiment is shown in FIG. Determination of the presence or absence of defects can be easily made using this flowchart.
このような本実施例の方法によれば、硫酸製造プラント
、硝酸製造プラント等の強酸製造プラントや、強酸をそ
の反応プロセス中に用いる 。According to the method of this embodiment, a strong acid production plant such as a sulfuric acid production plant or a nitric acid production plant, or a strong acid is used in the reaction process.
化学物質の製造プラント、原子力再処理プラント等高腐
食性流体を取扱うプラントの保守管理に極めて有効であ
る。It is extremely effective for maintenance management of plants that handle highly corrosive fluids, such as chemical manufacturing plants and nuclear reprocessing plants.
なお、使用する超音波としては、横波の方が縦波よりζ
異種金属継手の境界からのエコーが大きいので、本発明
では横波を使用する。Regarding the ultrasonic waves used, transverse waves are more powerful than longitudinal waves.
Since the echo from the boundary of dissimilar metal joints is large, transverse waves are used in the present invention.
また本発明の方法では超音波のビームを絞った方が測定
精度が向上するので、送信用、受信用とも探触子は集束
型を用いるのが望ましい。In addition, in the method of the present invention, measurement accuracy is improved by focusing the ultrasonic beam, so it is desirable to use a focusing type probe for both transmission and reception.
本発明の方法によればつぎのような効果を奏する。すな
わち、無欠陥の異極金属継手からも反射エコーが発生し
欠陥（特にナイフェツジ腐食）との識別がむつかしく超
音波探傷が困難であったのが本発明によって異極金属継
手の探傷が容易となったので、腐食の早期検出が可能と
なシ、さらに品質保証を向上させることが出来るように
なった。According to the method of the present invention, the following effects are achieved. In other words, reflected echoes are generated even from non-defective metal joints of different polarity, making it difficult to distinguish them from defects (particularly knife corrosion) and making ultrasonic flaw detection difficult. However, the present invention has made it easier to detect flaws in metal joints of different polarity. This makes it possible to detect corrosion early and further improve quality assurance.
【図面の簡単な説明】
第１図第２図は本発明の一実施例の方法の説明図、第３
図は前記実施例の自動識別の説明図、第４図は前記実施
例の方法を実施するためのフローチャート、第５図、第
６図、第７図は従来の超音波探傷方法の説明図である。
１・・・配管、２・・・溶接金属、３・・・配管、４．
５・・・境界、６・・・ナイフェツジ腐食、７・・・斜
角探触子、１０・・・探傷器、１１・・・ＣＲＴ、１２
・・・垂直探触子、１３・・・腐食先端部、１４・・・
底面、１５・・・送信用探触子、１６・・・受信用探触
子、イ・・・無欠陥反射エコー、口・・・欠陥反射エコ
ー、ハ・・・欠陥反射エコー、二・・・無欠陥反射エコ
ー位置、ホ・・・欠陥反射エコー位置、へ・・・欠陥反
射エコー位置、ト・・・無欠陥反射エコー（−撮触子法
）チ・・・欠陥反射エコー（−探触子法）、へ・・・送
信波立上り位置、ヌ・・・送信波、ａ・・・無欠陥反射
エコーの出現距離、ｂ・・・欠陥反射エコーの出現距離
、２３・・・ゲート、２４・・・位置出力端子、２５・
・・記憶回路、２６・・・表示装置、２７・・・減算回
路。
代理人 弁理士 坂 間 暁 外２名
第を圓
瑚２国
扇３国
側５図
１二＝７
謂６叉[Brief Description of the Drawings] Figure 1 and Figure 2 are explanatory diagrams of a method according to an embodiment of the present invention.
The figure is an explanatory diagram of the automatic identification according to the embodiment, FIG. 4 is a flowchart for implementing the method of the embodiment, and FIGS. 5, 6, and 7 are explanatory diagrams of the conventional ultrasonic flaw detection method. be. 1... Piping, 2... Welding metal, 3... Piping, 4.
5...Boundary, 6...Knifetsu corrosion, 7...Bevel probe, 10...Flaw detector, 11...CRT, 12
... Vertical probe, 13... Corrosion tip, 14...
Bottom surface, 15... Transmission probe, 16... Receiving probe, A... Non-defective reflected echo, Mouth... Defective reflected echo, C... Defective reflected echo, 2...・Position of non-defective reflected echo, E...Position of defective reflected echo, G...Position of defective reflected echo, G...Position of non-defective reflected echo (-toucher method), H...Position of defective reflected echo (-detection). tactile method), to... rising position of transmitted wave, nu... transmitted wave, a... appearance distance of defect-free reflected echo, b... appearance distance of defective reflected echo, 23... gate, 24... position output terminal, 25...
. . . Memory circuit, 26 . . . Display device, 27 . . . Subtraction circuit. Agent: Patent attorney Akira Sakama, 2nd person: Engo, 2 countries, 3 countries, 5 figures, 12 = 7, so-called 6 forks.
Claims (1)
れぞれ送信用および受信用としてタンデムに配置し前記
送信用探触子と前記受信用探触子とを相互に反対方向に
それぞれ等距離の位置に移動して前記異種金属間の境界
からの超音波反射エコーの消失および反射エコーの所定
出現位置以外の位置での出現を検出することを特徴とす
る異種金属継手の欠陥の非破壊的検出方法。Two transverse wave focusing ultrasonic probes are arranged in tandem toward the dissimilar metal joint, one for transmitting and one for receiving, and the transmitting probe and the receiving probe are arranged in opposite directions, respectively. Non-destruction of defects in dissimilar metal joints, characterized by moving to a position at a distance and detecting the disappearance of an ultrasonic reflected echo from the boundary between the dissimilar metals and the appearance of the reflected echo at a position other than a predetermined appearance position. target detection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63014595A JPH01191052A (en) | 1988-01-27 | 1988-01-27 | Nondestructive detecting method for defect of metallic joint of different kind |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63014595A JPH01191052A (en) | 1988-01-27 | 1988-01-27 | Nondestructive detecting method for defect of metallic joint of different kind |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01191052A true JPH01191052A (en) | 1989-08-01 |
Family
ID=11865533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63014595A Pending JPH01191052A (en) | 1988-01-27 | 1988-01-27 | Nondestructive detecting method for defect of metallic joint of different kind |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01191052A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5357893A (en) * | 1976-11-04 | 1978-05-25 | Mitsubishi Electric Corp | Inspecting apparatus of flaw by ultrasonic wave |
| JPS56143951A (en) * | 1980-04-10 | 1981-11-10 | Nisshin Steel Co Ltd | Ultrasonic flaw detection for austenite alloy steel welded steel pipe |
| JPS5999253A (en) * | 1982-11-29 | 1984-06-07 | Mitsubishi Heavy Ind Ltd | Oblique probe for sh wave |
-
1988
- 1988-01-27 JP JP63014595A patent/JPH01191052A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5357893A (en) * | 1976-11-04 | 1978-05-25 | Mitsubishi Electric Corp | Inspecting apparatus of flaw by ultrasonic wave |
| JPS56143951A (en) * | 1980-04-10 | 1981-11-10 | Nisshin Steel Co Ltd | Ultrasonic flaw detection for austenite alloy steel welded steel pipe |
| JPS5999253A (en) * | 1982-11-29 | 1984-06-07 | Mitsubishi Heavy Ind Ltd | Oblique probe for sh wave |
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