JPH058779B2 - - Google Patents
Info
- Publication number
- JPH058779B2 JPH058779B2 JP59128879A JP12887984A JPH058779B2 JP H058779 B2 JPH058779 B2 JP H058779B2 JP 59128879 A JP59128879 A JP 59128879A JP 12887984 A JP12887984 A JP 12887984A JP H058779 B2 JPH058779 B2 JP H058779B2
- Authority
- JP
- Japan
- Prior art keywords
- edge
- steel plate
- probe
- ultrasonic
- flaw detection
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
-
- 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
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0237—Thin materials, e.g. paper, membranes, thin films
-
- 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
- G01N2291/263—Surfaces
- G01N2291/2632—Surfaces flat
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は厚板熱延鋼帯等の鋼板の内部欠陥検出
を目的とした分割形垂直探触子により超音波探傷
を行なう方法の改良に関し、特に鋼板エツジ部の
不探傷領域縮小を行なうための深傷方法に関す
る。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement in a method of ultrasonic flaw detection using a split vertical probe for the purpose of detecting internal defects in steel plates such as thick hot-rolled steel strips. In particular, the present invention relates to a deep flaw method for reducing the undetected area of a steel plate edge.
鋼板エツジ部は、圧延後、後工程で加工された
り溶接される用途が多く、その際に残存する欠陥
を起因とした溶接欠陥の発生等の原因となるた
め、厳格な非破壊検査を行う必要がある部位であ
る。一方、鋼板エツジ部はシヤーによるだれ等、
形状が不均一なため超音波探傷を行うに当つて最
エツジ部には探傷できない領域であり、従来から
この最エツジ部の不感帯を縮小することが超音波
探傷上大きな課題となつていたが有効な方法がな
かつた。
Steel plate edges are often processed or welded in subsequent processes after rolling, and as these may cause welding defects due to residual defects, strict non-destructive testing is required. This is the part where there is. On the other hand, the edges of the steel plate may be sagging due to shear, etc.
Due to the non-uniformity of the shape, ultrasonic flaw detection cannot detect flaws at the edge, and reducing the dead zone at the edge has traditionally been a major challenge in ultrasonic flaw detection, but it is effective. There was no other way.
従来の分割形垂直探触子による鋼板の探傷方法
（例えば日本非破壊検査協会発行〈1976.4.1〉の
「超音波探傷試験Ａ」のP61に示される。）の原理
を第１図に示す。 The principle of the conventional flaw detection method for steel plates using a split vertical probe (for example, as shown on page 61 of ``Ultrasonic Flaw Detection Test A'' published by the Japan Nondestructive Inspection Association, April 1, 1976) is shown in Figure 1.
第１図において、分割形垂直探触子２は、送信
用およビ受信用に分割された二つの振動子３，お
よび３ａ，くさび４，接栓６および音響分割面５
からなり、送信振動子３から送信された超音波ビ
ームは、数度の入射角をもち、被検材鋼板１の表
面で屈折し鋼板に照射され、さらに欠陥等による
反射エコー７ａが送信ビームと対称な逆向きの経
路をたどり、受信用振動子３ａにより受信され
る。 In FIG. 1, a split vertical probe 2 includes two transducers 3 and 3a divided for transmission and reception, a wedge 4, a plug 6, and an acoustic splitting surface 5.
The ultrasonic beam transmitted from the transmitting transducer 3 has an incident angle of several degrees, is refracted on the surface of the steel plate 1 to be inspected, and is irradiated onto the steel plate, and further reflected echoes 7a due to defects etc. are combined with the transmitted beam. The signal follows a symmetrical reverse path and is received by the receiving transducer 3a.
振動子の大きさ、入射角等の探触子の諸元は、
検出すべき欠陥の種類，大きさと適用板厚節囲に
より決定されるが、従来、送受信振動子は、同一
入射角，同一寸法のものすなわち左右対称のもの
が使用され、鋼板エツジ部では第２ａ図（平面
図）および第２ｂ図（側面図）に示す探触子２の
配置方法で行つていた。 The specifications of the probe, such as the size of the transducer and the angle of incidence, are as follows:
This is determined by the type and size of the defect to be detected and the applied plate thickness, but conventionally, transmitting and receiving transducers have been used with the same incident angle and the same dimensions, that is, bilaterally symmetrical transducers. The method of arranging the probe 2 shown in Fig. 2 (top view) and Fig. 2b (side view) was used.
すなわち第２ａ図および第２ｂ図に示すよう
に、探触子走査方向９（矢印）は、鋼板エツジに
対して平行方向に、そして探触子２の音響分割面
５は鋼板エツジに対して直角に配置していた。 2a and 2b, the probe scanning direction 9 (arrow) is parallel to the steel plate edge and the acoustic splitting plane 5 of the probe 2 is perpendicular to the steel plate edge. It was placed in
この結果、従来の方法による探傷性能は、先づ
第一に鋼板エツジ部シヤーだれ等により傾きθt10
による感度低下をきたしていた。この感度低下は
第３図に例を示すが、感度低下が1/2（−6dB）
となる傾き角θtは、振動子の寸法にもよるが、
0.2゜〜1.0゜と、わずかな傾き角で著しく起こる。
第二に第２ｂ図に示す最エツジ部の不感帯１１は
第４図に示すように探傷子２として5z8×8NDす
なわち5MHf振動子，寸法８mm×８mmの分割形垂
直探触子２を使用した例であるが、疵エツジから
距離７mm以上離れていないと充分な検出性能が得
られないことが判つている。 As a result, the flaw detection performance of the conventional method is affected by the slope θt10 due to the shearing of the steel plate edge.
This resulted in a decrease in sensitivity. An example of this decrease in sensitivity is shown in Figure 3, where the decrease in sensitivity is 1/2 (-6dB).
The tilt angle θt depends on the dimensions of the vibrator, but
This phenomenon occurs significantly at small inclination angles of 0.2° to 1.0°.
Second, the dead zone 11 at the extreme edge shown in Fig. 2b is an example of using a split type vertical probe 2 with dimensions of 8 mm x 8 mm and a 5z8 x 8ND, that is, 5 MHf resonator, as the flaw detector 2, as shown in Fig. 4. However, it is known that sufficient detection performance cannot be obtained unless the distance is 7 mm or more from the flawed edge.
本発明は上述の問題点を克服した鋼板エツジ部
の新しい超音波探傷方法を提供すること、すなわ
ち鋼板エツジ部の不探傷領域を縮小することを目
的とする。
An object of the present invention is to provide a new ultrasonic flaw detection method for steel plate edges that overcomes the above-mentioned problems, that is, to reduce the undetectable area of steel plate edges.
本発明の骨子は、分割形垂直探触子による鋼板
エツジ部の超音波探傷方法において、分割形垂直
探触子の音響分割面が鋼板エツジ部と平行になる
ように配置し、該音響分割面を挟んで分割された
送受信用の振動子の超音波ビームの入射角を偏ら
せて鋼板エツジ部側にビーム伝播位置をずらせて
探傷する、にある。
The gist of the present invention is to provide an ultrasonic flaw detection method for the edge of a steel plate using a split vertical probe, in which the acoustic splitting surface of the split vertical probe is arranged parallel to the edge of the steel plate. The method involves deflecting the incident angle of the ultrasonic beam of the transmitting and receiving transducer that is divided across the two sides, and shifting the beam propagation position toward the edge of the steel plate for flaw detection.
以下本発明方法の詳細を実施例に従つて説明す
る。 The details of the method of the present invention will be explained below with reference to Examples.
第５図に本発明方法の原理図を示す。探触子２
の向きは第５ａ図に示すように、音響分割面５を
鋼板エツジに対し平行方向になるように配置し、
鋼板最エツジ部８に出来るだけ近づけておき、鋼
板エツジ８と平行に探触子走査方向９をとる。 FIG. 5 shows a diagram of the principle of the method of the present invention. Probe 2
As shown in FIG. 5a, the acoustic dividing surface 5 is arranged parallel to the steel plate edge,
The probe is placed as close to the edge 8 of the steel plate as possible, and the probe scanning direction 9 is parallel to the edge 8 of the steel plate.
又、第５ｂ図に示すように送信振動子３および
受信振動子３ａの超音波入射角は、それぞれ異つ
た角度にし、ビーム伝播位置をエツジ部側８へ偏
らせるようにする。すなわち、例えば第５ｂ図の
ようにエツジ部側８に位置する受信振子の入射角
を0゜とし、送信側を従来約4゜程度を使用していた
ものを約8゜前後にするものである。 Further, as shown in FIG. 5b, the ultrasonic incident angles of the transmitting transducer 3 and the receiving transducer 3a are set to different angles, respectively, so that the beam propagation position is biased toward the edge portion side 8. That is, for example, as shown in Figure 5b, the angle of incidence of the receiving pendulum located on the edge side 8 is set to 0°, and the angle of incidence on the transmitting side, which used to be about 4°, is set to about 8°. .
本発明はこのような方法を採用することによ
り、第５ｂ図に示すエツジ部８の傾きθh12に対
する感度低下は、第６図に示す例のように従来法
に比較してエコー高さが1/2に低下する角度は
2.0゜と大幅に改善され、また、エツジ部の不感帯
１１は第７図に示すように４mmでも充分探傷可能
である。上述の第６図，第７図に示すプローブ
は、5z8×8NDのプローブすなわち5MHz，振動
子寸法８mm×８mmの分割形垂直探触子で送信振動
子３の入射角8゜，受信振動子３ａの入射角0゜であ
る。 By adopting such a method, the present invention reduces the sensitivity to the slope θh12 of the edge portion 8 shown in FIG. The angle that drops to 2 is
The angle is significantly improved to 2.0°, and the dead zone 11 at the edge can be sufficiently detected even with a width of 4 mm as shown in FIG. The probe shown in Figs. 6 and 7 above is a 5z8 x 8ND probe, that is, a 5MHz, split-type vertical probe with transducer dimensions of 8 mm x 8 mm, and the incident angle of the transmitting transducer 3 is 8°, and the receiving transducer 3a The angle of incidence is 0°.
本発明方法を実施するために用いる探触子構造
は、前記の他に、送受信振動子を音響分割面を挟
んで複数個組み合せる方法もある。 In addition to the above-mentioned probe structure used to carry out the method of the present invention, there is also a method in which a plurality of transmitting and receiving transducers are combined with an acoustic dividing plane in between.
その例を第８ａ図および第８ｂ図に示す。 Examples are shown in Figures 8a and 8b.
第８ａ図は、送信振動子を３1，３2，３3と三
分割（入射角と寸法はそれぞれ同じ）にしたもの
で、、送信ビームの音場分布が鋼板内で異なり、
特に板厚方向の音場の均一化の手段として効果が
ある。 In Figure 8a, the transmitting oscillator is divided into three parts: 3 1 , 3 2 , and 3 3 (the incident angle and dimensions are the same), and the sound field distribution of the transmitting beam is different within the steel plate.
It is particularly effective as a means of uniformizing the sound field in the thickness direction.
又、第８ｂ図は更に三分割した送信振動子の３
４，３5，３6の入射角θ1，θ2，θ3および寸法を変
え、これも板厚方向の音場の均一化を更に図るも
のである。 In addition, Fig. 8b shows three parts of the transmitting oscillator further divided into three parts.
The incident angles θ 1 , θ 2 , θ 3 and dimensions of 4 , 3 5 and 3 6 are changed to further homogenize the sound field in the thickness direction.
さらに第９図に示すように受信振動子におわん
形の焦点形振動子等の利用により、微小欠陥を検
出できるよう検出性能を向上させることも可能で
ある。今まで受信振動子３ａをエツジ側に、送信
振動子３をエツジ内部に配置した例で説明して来
たが逆配置でも実施可能である。 Furthermore, as shown in FIG. 9, by using a bowl-shaped focal type vibrator as the receiving vibrator, it is possible to improve the detection performance so that minute defects can be detected. Up to now, an example has been described in which the receiving transducer 3a is arranged on the edge side and the transmitting transducer 3 is arranged inside the edge, but it is also possible to implement the arrangement in the opposite manner.
以上説明したように、本発明は分割形垂直探触
子の左右の振動子の入射角を偏らせてエツジ部側
に超音波ビームの伝播経路がなるようにして、鋼
板板厚，検出すべき欠陥を考慮して、振動子寸
法，入射角度等の探触子諸元を決定し、適用する
ことにより鋼板エツジ部不感帯の大幅な縮小が可
能となり、得られる効果は非常に大きいものがあ
る。
As explained above, the present invention biases the incident angles of the left and right transducers of the split vertical probe so that the propagation path of the ultrasonic beam is on the edge side, thereby determining the thickness of the steel plate that should be detected. By determining and applying the transducer dimensions, incident angle, and other probe specifications in consideration of defects, it is possible to significantly reduce the dead zone at the edge of the steel plate, and the resulting effect is very large.
第１図は従来法の分割形探触子の断面構造図、
第２ａ図および第２ｂ図は従来法の原理図であ
り、第２ａ図は平面図、第２ｂ図は側面図であ
る。第３図は従来法のエツジ部の傾き特性例を示
すグラフ、第４図は従来法のエツジ部の欠陥検出
能力例を示すグラフ、第５ａ図および第５ｂ図は
本発明法の原理図であり、第５ａ図は平面図、第
５ｂ図は側面図である。第６図は本発明法のエツ
ジ部の傾き特性例を示すグラフ、第７図は本発明
法のエツジ部欠陥検出能力例を示すグラフであ
る。第８ａ図，第８ｂ図および第９図は、それぞ
れ、本発明を実施するのに用いる他の探触子構造
を示す断面図である。
１……試験材、２……分割形垂直探触子、３，
３1〜３6……送信用振動子、３ａ，３a1……受信
用振動子、４……くさび、５……音響分割面、６
……接栓、７……送信超音波ビーム、７ａ……反
射エコー、８……鋼板エツジ、９……探触子走査
方向、１０……傾き角θt、１１……エツジ不感
帯、１２……傾き角θh。
Figure 1 is a cross-sectional structural diagram of a conventional split type probe.
FIGS. 2a and 2b are diagrams showing the principle of the conventional method, with FIG. 2a being a plan view and FIG. 2b being a side view. Fig. 3 is a graph showing an example of the slope characteristic of the edge portion of the conventional method, Fig. 4 is a graph showing an example of the defect detection ability of the edge portion of the conventional method, and Figs. 5a and 5b are diagrams of the principle of the method of the present invention. 5a is a plan view, and FIG. 5b is a side view. FIG. 6 is a graph showing an example of the edge slope characteristic of the method of the present invention, and FIG. 7 is a graph showing an example of the edge defect detection ability of the method of the present invention. Figures 8a, 8b, and 9 are cross-sectional views of other probe structures for use in practicing the present invention. 1... Test material, 2... Split vertical probe, 3,
3 1 to 3 6 ... Transmission transducer, 3a, 3a 1 ... Receiving transducer, 4 ... Wedge, 5 ... Acoustic dividing surface, 6
...Plug, 7...Transmitted ultrasonic beam, 7a...Reflected echo, 8...Steel plate edge, 9...Probe scanning direction, 10...Tilt angle θt, 11...Edge dead zone, 12... Tilt angle θh.
Claims (1)
波深傷方法において、分割形垂直探触子の音響分
割面が、鋼板エツジ部と平行になるように配置
し、該音響分割面を挟んで分割された送受信用の
振動子の超音波ビームの入射角を偏らせて、鋼板
エツジ部側にビーム伝播位置をずらせて探傷する
ことを特徴とする鋼板エツジ部の超音波探傷方
法。1. In the method of ultrasonic deep damage on the edge of a steel plate using a split-type vertical probe, the acoustic splitting surface of the split-type vertical probe is placed parallel to the edge of the steel plate, and the acoustic splitting surface is placed between An ultrasonic flaw detection method for an edge of a steel plate, characterized in that the incident angle of an ultrasonic beam of a divided transmitting/receiving transducer is biased, and the beam propagation position is shifted toward the edge of the steel plate for flaw detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59128879A JPS618657A (en) | 1984-06-22 | 1984-06-22 | Ultrasonic flaw detecting method of steel sheet edge part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59128879A JPS618657A (en) | 1984-06-22 | 1984-06-22 | Ultrasonic flaw detecting method of steel sheet edge part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS618657A JPS618657A (en) | 1986-01-16 |
| JPH058779B2 true JPH058779B2 (en) | 1993-02-03 |
Family
ID=14995608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59128879A Granted JPS618657A (en) | 1984-06-22 | 1984-06-22 | Ultrasonic flaw detecting method of steel sheet edge part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS618657A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210278373A1 (en) * | 2017-01-19 | 2021-09-09 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Ultrasonic probe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57171512U (en) * | 1981-04-23 | 1982-10-28 |
-
1984
- 1984-06-22 JP JP59128879A patent/JPS618657A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS618657A (en) | 1986-01-16 |
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