JPH0522841B2 - - Google Patents
Info
- Publication number
- JPH0522841B2 JPH0522841B2 JP59102047A JP10204784A JPH0522841B2 JP H0522841 B2 JPH0522841 B2 JP H0522841B2 JP 59102047 A JP59102047 A JP 59102047A JP 10204784 A JP10204784 A JP 10204784A JP H0522841 B2 JPH0522841 B2 JP H0522841B2
- Authority
- JP
- Japan
- Prior art keywords
- radiation
- defect
- image
- steel pipe
- reference gauge
- 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
- 230000005855 radiation Effects 0.000 claims description 51
- 230000007547 defect Effects 0.000 claims description 43
- 229910001385 heavy metal Inorganic materials 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 35
- 239000010959 steel Substances 0.000 description 35
- 239000003550 marker Substances 0.000 description 18
- 238000005259 measurement Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013208 measuring procedure Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/18—Investigating the presence of flaws defects or foreign matter
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)
- Analysing Materials By The Use Of Radiation (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は放射線透過試験機に係わり、特に被検
査体内に存在する欠陥の位置および寸法を精度良
く検出するために用いる放射線透過試験機用ゲー
ジに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a radiographic testing machine, and more particularly to a gauge for a radiographic testing machine used to accurately detect the position and size of a defect existing within an inspected body. .
［発明の技術的背景］
被検査体の内部に存在する欠陥の位置および寸
法を被検査体を切断せずに測定する非破壊検査装
置の一つとして、放射線の透過性を利用した放射
線透過試験機がある。このような放射線透過試験
機でもつて、鋼板等の接続部に含まれる表面と平
行した欠陥の厚み方向の位置および寸法を測定す
る場合、通常、第１図ａに示すように、鋼板１の
欠陥２が存在すると推定される位置の下側表面
に、例えばタングステン、鉛等の重金属製のワイ
ヤー等の放射線フイルムマーカー３を貼付け、こ
の放射線フイルムマーカー３の下側に放射線感光
材としての放射線フイルム４を配置する。そし
て、放射線フイルムマーカー３を含む中心線５に
対して予め定められた所定の傾斜角θでもつて、
放射線源６からＸ線等の放射線７を鋼板１に照射
する。その結果、放射線フイルム４には第１図ｂ
に示すように放射線フイルムマーカー３の像８と
欠陥２の像９が生じる。[Technical Background of the Invention] Radiographic testing that utilizes the transparency of radiation is used as a non-destructive inspection device that measures the position and dimensions of defects existing inside an inspected object without cutting the inspected object. There is a chance. Even with such a radiographic testing machine, when measuring the position and dimension in the thickness direction of a defect parallel to the surface included in a joint part of a steel plate, etc., the defect in the steel plate 1 is usually detected as shown in Fig. 1a. A radiographic film marker 3 such as a wire made of heavy metal such as tungsten or lead is pasted on the lower surface of the position where it is estimated that the radioactive film 2 is present, and a radiographic film 4 as a radiation-sensitive material is attached to the lower side of the radiographic film marker 3. Place. Even at a predetermined inclination angle θ with respect to the center line 5 including the radiation film marker 3,
A radiation source 6 irradiates the steel plate 1 with radiation 7 such as X-rays. As a result, the radiation film 4 is shown in Figure 1b.
An image 8 of the radiation film marker 3 and an image 9 of the defect 2 are generated as shown in FIG.
次に、第２図ａに示すように放射線源６を中心
線５に対して第１図ａと反対側に移動して鋼板１
に放射線７を照射する。その結果、放射線フイル
ム４には第２図ｂに示すように欠陥２の像９が放
射線フイルムマーカー３の像８に対して第１図ｂ
と反対側位置に生じる。しかして第３図に示すよ
うに、放射線源６の移動距離をＤ、放射線源６か
ら放射線フイルム４までの距離をＦ、第１図ｂ、
第２図ｂの放射線フイルム４上の欠陥２の像９の
移動距離をｄとすると、簡単な幾何学的考察によ
つて鋼板１内の欠陥２の下側表面からの距離（深
さ）ｈは式にて求まる。 Next, as shown in FIG. 2a, the radiation source 6 is moved to the opposite side of the center line 5 from FIG.
irradiate with radiation 7. As a result, the image 9 of the defect 2 on the radiation film 4 as shown in FIG.
occurs in the opposite position. As shown in FIG. 3, the moving distance of the radiation source 6 is D, the distance from the radiation source 6 to the radiation film 4 is F, and FIG.
If the moving distance of the image 9 of the defect 2 on the radiation film 4 in FIG. is determined by the formula.
ｈ＝dF／（Ｄ＋ｄ） ……
また、欠陥２が鋼板１の厚み方向に存在する場
合、第４図ａに示すように、放射線６から放射線
７を鋼板１に対して所定の傾斜角θでもつて照射
すると、放射線フイルム４上には第４図ｂに示す
ように、欠陥２の高さ方向の幅Ｈに対応して長さ
Ｗの欠陥２の像１０が生じる。この場合、放射線
源６と鋼板１との間の距離が十分大きいとする
と、鋼板１内の欠陥２の実際の幅Ｈは近似的に
式にて求まる。 h=dF/(D+d)...In addition, when the defect 2 exists in the thickness direction of the steel plate 1, as shown in Fig. 4a, the radiation 6 to the radiation 7 are arranged at a predetermined angle of inclination θ with respect to the steel plate 1. Upon irradiation, an image 10 of the defect 2 having a length W corresponding to the width H of the defect 2 in the height direction is generated on the radiation film 4, as shown in FIG. 4b. In this case, assuming that the distance between the radiation source 6 and the steel plate 1 is sufficiently large, the actual width H of the defect 2 in the steel plate 1 can be approximately determined by the formula.
Ｈ≒Ｗ／tanθ ……
［背景技術の問題点］
しかしながら、上記のように構成された放射線
透過試験機においては次のような問題があつた。
すなわち、第１図に示すように、鋼板１内の欠陥
２の位置（下表面からの距離）ｈを式のように
放射線減６の移動距離Ｄ、放射線フイルム４まで
の距離Ｆ、２枚の放射線フイルム４から求めた欠
陥２の像９の移動距離ｄから算出する方法である
と、欠陥位置の測定精度はこれ等各距離Ｄ，Ｆ，
ｄの測定精度に依存する。しかし、上記各距離を
精度良く測定することは多大の労力を要し、また
実際には非常に困難であるので、第１図に示す測
定方法は現実的でない。 H≒W/tanθ... [Problems with Background Art] However, the radiation transmission tester configured as described above has the following problems.
That is, as shown in FIG. 1, the position (distance from the lower surface) h of the defect 2 in the steel plate 1 is expressed as follows: the moving distance D of the radiation reduction 6, the distance F to the radiation film 4, and the distance between the two sheets. According to the method of calculating from the movement distance d of the image 9 of the defect 2 obtained from the radiation film 4, the measurement accuracy of the defect position is determined by each distance D, F,
It depends on the measurement accuracy of d. However, since measuring each of the distances with high accuracy requires a great deal of effort and is actually very difficult, the measuring method shown in FIG. 1 is not practical.
また、第４図に示す鋼板１内の欠陥２の高さ方
向の幅Ｈを測定する方法においても、欠陥２が第
４図に示すように正確に鋼板１の厚み方向を向い
ている場合は問題ないが、例えば鋼板１の接続部
において溶け込み不足等が生じたときのように欠
陥２の方向が斜め方向を向いていた場合、放射線
フイルム４上には第５図に示すように、斜め方向
の欠陥２による像１１が生じる。この場合どの方
向に欠陥２の像１１の寸法測定を実施して良いの
かが判断できないので、この測定方法も実用的で
ない。 Also, in the method of measuring the width H in the height direction of the defect 2 in the steel plate 1 shown in FIG. 4, if the defect 2 is exactly oriented in the thickness direction of the steel plate 1 as shown in FIG. There is no problem, but if the direction of the defect 2 is diagonal, for example when insufficient penetration occurs at the joint of the steel plate 1, the radiation film 4 will have a diagonal direction as shown in FIG. An image 11 due to the defect 2 is generated. In this case, it is not possible to determine in which direction the dimensions of the image 11 of the defect 2 should be measured, so this measurement method is also not practical.
特に、第６図に示すように被検査体が鋼板でな
くて、円筒状の鋼管１２のよう表面が曲面に形成
されている場合、第４図と同様に鋼管１２に対し
て所定の傾斜角θでもつて、放射線源６から放射
線７を照射すると、第７図ａ，ｂに示すように鋼
管１２の環状の接続部分に沿つて複数の欠陥１３
ａ，１３ｂが存在する場合、放射線フイルム４に
生じる欠陥１３ａ，１３ｂの像１４ａ，１４ｂは
第７図ｃに示すように、その欠陥１３ａ，１３ｂ
が存在する周方向位置によつて、像の形状が大き
く変化する。これらの像１４ａ，１４ｂから鋼管
１２内に存在する欠陥１３ａ，１３ｂの正確な位
置と寸法を算出することは非常に困難である。ま
た、被検査体が鋼管１２のように円筒状でなく
て、規則性が無く任意の形状をしている場合、放
射線フイルム４上の像から欠陥の位置、寸法を算
出することはほぼ不可能である。 In particular, when the object to be inspected is not a steel plate but has a curved surface such as a cylindrical steel pipe 12, as shown in FIG. θ, when radiation 7 is irradiated from the radiation source 6, a plurality of defects 13 are formed along the annular connecting portion of the steel pipe 12, as shown in FIGS. 7a and 7b.
When defects 13a and 13b exist, images 14a and 14b of defects 13a and 13b occurring on the radiation film 4 are as shown in FIG. 7c.
The shape of the image changes greatly depending on the circumferential position where it exists. It is very difficult to calculate the exact positions and dimensions of the defects 13a, 13b existing in the steel pipe 12 from these images 14a, 14b. Furthermore, if the object to be inspected is not cylindrical like the steel pipe 12 but has an arbitrary shape with no regularity, it is almost impossible to calculate the position and size of the defect from the image on the radiation film 4. It is.
［発明の目的］
本発明はこのような事情に基づいてなされたも
のであり、その目的とするところは、鋼管等のよ
うに表面がたとえ曲面に形成された被検査体であ
つたとしも、内部に存在する欠陥の位置および寸
法を精度良くかつ簡単に測定可能とする放射線透
過試験機用基準ゲージを提供することにある。[Objective of the Invention] The present invention has been made based on the above circumstances, and its purpose is to detect an object to be inspected, even if the surface is formed into a curved surface, such as a steel pipe. It is an object of the present invention to provide a reference gauge for a radiographic testing machine that enables accurate and easy measurement of the position and size of internal defects.
［発明の概要］
本発明の放射線透過試験機用基準ゲージは、放
射線透過試験機の被検査体と放射線感光材との間
に介挿されるもので、可撓性を有した板状支持物
体内に、この板状支持物体の厚み方向に複数の第
１の重金属製棒状マーカーを埋設するとともに上
記厚み方向に対して直角方向に複数の第２の重金
属製棒状マーカーを埋設したものである。[Summary of the Invention] The reference gauge for a radiation transmission testing machine of the present invention is inserted between an object to be inspected and a radiation-sensitive material in a radiation transmission testing machine, and is inserted into a flexible plate-shaped support object. A plurality of first bar-shaped heavy metal markers are embedded in the thickness direction of this plate-shaped support object, and a plurality of second bar-shaped heavy metal markers are embedded in a direction perpendicular to the thickness direction.
［発明の実施例］
以下本発明の一実施例を図面を用いて説明す
る。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.
第８図ａは実施例に係わる放射線透過試験機用
基準ゲージの一部を示す平面図であり、同図ｂは
立面図である。図中２１は幅Ａ、厚みＢの矩形状
断面を有した帯状支持物体であり、この帯状支持
物体２１は可撓性を有するゴム磁石で形成されて
いる。そして、帯状支持物体２１内の長手方向
に、この帯状支持物体２１を厚み方向に貫通する
長さＢの放射線を吸収する重金属で棒状に形成さ
れた第１のマーカー２２が、相互に等間隔Ｃを有
して複数個埋設されている。また、同じく長手方
向に、上記厚み方向と直交する方向、すなわち幅
方向に第１のマーカー２２と同一物質の第２のマ
ーカー２３が、同じく相互に等間隔Ｃを有して複
数個埋設されている。なお、第２のマーカー２３
の長さＥは帯状支持物体２１の幅Ａより短く設定
されている。なお、上記長さは位置検出用に５個
おきに長さＥより長い値E′に設定されている。そ
して、実施例の放射線透過試験機用基準ゲージ
（以下基準ゲージと略記する）２４の上記各寸法
は例えば、Ａ＝15mm、Ｂ＝５mm、Ｃ＝20mm、Ｅ＝
６mm、E′＝10mmに設定されている。 FIG. 8a is a plan view showing a part of the reference gauge for a radiographic testing machine according to the embodiment, and FIG. 8b is an elevational view. In the figure, reference numeral 21 denotes a band-shaped supporting object having a rectangular cross section with a width A and a thickness B, and this band-shaped supporting object 21 is made of a flexible rubber magnet. Then, in the longitudinal direction of the band-shaped support object 21, first markers 22 formed in a rod shape made of heavy metal that absorb radiation having a length B that penetrates the band-shaped support object 21 in the thickness direction are arranged at regular intervals C. A number of them are buried. Further, in the same longitudinal direction, a plurality of second markers 23 made of the same material as the first marker 22 are buried at equal intervals C in a direction perpendicular to the thickness direction, that is, in the width direction. There is. Note that the second marker 23
The length E is set shorter than the width A of the strip-shaped support object 21. Note that the above-mentioned length is set to a value E' that is longer than the length E every fifth for position detection. The above-mentioned dimensions of the reference gauge (hereinafter abbreviated as reference gauge) 24 for the radiographic testing machine of the embodiment are, for example, A=15 mm, B=5 mm, C=20 mm, E=
6mm, and E'=10mm.
上記基準ゲージ２４は、放射線透過試練機でも
つて鋼管の接続部に存在する欠陥の位置および寸
法を測定する場合第９図ａ，ｂに示すように使用
される。すなわち、鋼管１２の環状の接続部２５
内部に溶け込む不足による内周面から外周へ向か
う環状欠陥２６が存在する場合、実施例の帯状の
基準ゲージ２４を環状の接続部２５に隣接した鋼
管１２外周面に取付けられる。なお、帯状支持物
体２１はゴム磁石で形成されているので鋼管１２
に容易に取付けることが可能である。さらに、接
続部２５を挟んで基準ゲージ２４と反対側にこの
基準ゲージ２４と同一形状のゴム磁石で形成され
たスペーサ２７が取付けられている。そして、基
準ゲージ２４およびスペーサ２７の外周面に放射
線フイルム４が取付けられている。なお、スペー
サ２７は放射線フイルム４の位置を鋼管１２の外
周面に対して平行に保持するものである。この状
態においては、基準ゲージ２４の各第１のマーカ
ー２２の方向は鋼管１２の半径方向に一致し、各
第２のマーカー２３の方向は軸方向と一致する。 The reference gauge 24 is used as shown in FIGS. 9a and 9b when measuring the position and size of a defect existing in a joint of a steel pipe using a radiographic testing machine. That is, the annular connecting portion 25 of the steel pipe 12
If there is an annular defect 26 extending from the inner circumferential surface toward the outer circumference due to insufficient penetration into the interior, the band-shaped reference gauge 24 of the embodiment is attached to the outer circumferential surface of the steel pipe 12 adjacent to the annular connecting portion 25. Note that since the band-shaped support object 21 is made of a rubber magnet, the steel pipe 12
It can be easily installed on. Further, a spacer 27 made of a rubber magnet and having the same shape as the reference gauge 24 is attached on the opposite side of the reference gauge 24 with the connecting portion 25 in between. A radiation film 4 is attached to the outer peripheral surfaces of the reference gauge 24 and the spacer 27. Note that the spacer 27 maintains the position of the radiation film 4 parallel to the outer peripheral surface of the steel pipe 12. In this state, the direction of each first marker 22 of the reference gauge 24 coincides with the radial direction of the steel pipe 12, and the direction of each second marker 23 coincides with the axial direction.
そして、第６図と同様に鋼管１２に対して放射
線源６から傾斜角θの放射線７を照射すると、放
射線フイルム４上には、第１０図に示すように、
環状欠陥２６の外側境界線の像２８と、内側境界
線（鋼管１２の内周面位置）の像２９と、各第１
のマーカー２２の各像３０および各第２のマーカ
ー２３の各像３１が生じる。放射線７は第９図ａ
に示すように鋼管１２の周方向に傾斜していない
く、かつ第２のマーカー２３は軸方向に配列され
ているので、放射線フイルム４の第２のマーカー
２３の各像３１は鋼管１２の軸線３２と平行にな
る。一方各第１のマーカー２２は鋼管１２の周方
向に配列されているので、各第１のマーカー２２
の各像３０の方向θ1および長さB1は第７図に示
したようにその周方向位置（角度）によつて異な
る。しかし、実際の第１のマーカー２２の長さＢ
および方向は既知であるので、この位置Ｆにおけ
る環状欠陥２６の実際の寸法（深さ）Ｌを簡単に
求めることが可能である。すなわち、位置Ｆから
この位置における第１のマーカー２２の像３０の
平行線と内側境界線の像２９との交点Ｇまでの距
離が環状欠陥２６の放射線フイルム４上の寸法
（深さ）L1となる。したがつて、実際の寸法Ｌは
簡単な比例計算によつてて式にて求まる。 Then, when the radiation source 6 irradiates the steel pipe 12 with the radiation 7 at the angle of inclination θ in the same manner as shown in FIG. 6, on the radiation film 4, as shown in FIG.
An image 28 of the outer boundary line of the annular defect 26, an image 29 of the inner boundary line (inner peripheral surface position of the steel pipe 12), and each first
Each image 30 of each marker 22 and each image 31 of each second marker 23 are generated. Radiation 7 is shown in Figure 9a
As shown in FIG. 2, the steel pipe 12 is not inclined in the circumferential direction, and the second markers 23 are arranged in the axial direction, so each image 31 of the second marker 23 on the radiation film 4 is aligned with the axis of the steel pipe 12. It becomes parallel to 32. On the other hand, since each first marker 22 is arranged in the circumferential direction of the steel pipe 12, each first marker 22
The direction θ 1 and length B 1 of each image 30 differ depending on its circumferential position (angle) as shown in FIG. However, the actual length B of the first marker 22
Since the direction and direction are known, it is possible to easily determine the actual dimension (depth) L of the annular defect 26 at this position F. That is, the distance from the position F to the intersection G of the parallel line of the image 30 of the first marker 22 and the image 29 of the inner boundary line at this position is the dimension (depth) of the annular defect 26 on the radiation film 4 L 1 becomes. Therefore, the actual dimension L can be determined by a simple proportional calculation.
Ｌ＝L1Ｂ／B1 ……
なお、実際の環状欠陥２６における位置Ｇの鋼
管１２上の周方向位置は、第２のマーカー２３の
像３１の位置確認によつて、容易に求めることが
可能である。 L=L 1 B/B 1 ... Note that the circumferential position of position G on the steel pipe 12 in the actual annular defect 26 can be easily determined by confirming the position of the image 31 of the second marker 23. It is possible.
このように、予め定められた方向および長さの
第１および第２のマーカー２２，２３を埋設した
基準ゲージ２４を環状の接続部２５に隣接した鋼
管１２の外周面に磁石の吸着力でもつて取付け、
この基準ゲージ２４の各第１および第２のマーカ
ー２２，２３を接続部２５内の周方向に存在する
環状欠陥２６とともに同一放射線フイルム４上に
感光させている。そして、実際の第１および第２
のマーカー２２，２３の位置、方向、寸法と放射
線フイルム４上の像３０，３１の位置、方向、寸
法との関係を求め、その関係を用いて放射線フイ
ルム上の環状欠陥２６の像から実際の鋼管１２の
上の位置、寸法を算出するようにしている。した
がつて、これらの算出手順は上述したように簡単
な比例計算で実施できるので、環状欠陥２６のよ
うに複雑な形状の欠陥であつても、その位置、寸
法を正確にかつ簡単に計測することが可能であ
る。 In this way, the reference gauge 24 in which the first and second markers 22 and 23 are embedded in a predetermined direction and length is attached to the outer circumferential surface of the steel pipe 12 adjacent to the annular connecting portion 25 by the attraction force of the magnet. installation,
The first and second markers 22 and 23 of this reference gauge 24 are exposed on the same radiation film 4 together with the annular defect 26 existing in the circumferential direction within the connecting portion 25. And the actual first and second
The relationship between the positions, directions, and dimensions of the markers 22, 23 and the positions, directions, and dimensions of the images 30, 31 on the radiation film 4 is determined, and using that relationship, the actual image is determined from the image of the annular defect 26 on the radiation film 4. The position and dimensions on the steel pipe 12 are calculated. Therefore, these calculation procedures can be performed by simple proportional calculations as described above, so even if the defect has a complex shape like the annular defect 26, its position and dimensions can be measured accurately and easily. Is possible.
また、従来の第１図、第２図に示す試験機のよ
うに各距離Ｄ，ｄ，Ｆを正確に測定する必要な
い。また、第４図に示すように傾斜角θを正確に
測定する必要もない。したがつて、測定に要する
時間を短縮でき、測定作業能率を向上できる。 Further, unlike the conventional testing machines shown in FIGS. 1 and 2, it is not necessary to accurately measure the distances D, d, and F. Furthermore, there is no need to accurately measure the inclination angle θ as shown in FIG. Therefore, the time required for measurement can be shortened and measurement work efficiency can be improved.
また一回の測定に放射線フイルム４の使用枚数
は１枚のみであるので測定に要する経費を低減す
ることも可能である。 Further, since only one radiation film 4 is used for one measurement, it is also possible to reduce the cost required for measurement.
なお、本発明は上述した実施例に限定されるも
のではない。実施例においては本発明の基準ゲー
ジを鋼管１２の接続部２５内に存在する環状欠陥
２６の検出に用いたが、表面が曲面に形成された
他の被検査体に適用することも可能である。 Note that the present invention is not limited to the embodiments described above. In the examples, the reference gauge of the present invention was used to detect the annular defect 26 existing in the joint 25 of the steel pipe 12, but it can also be applied to other objects to be inspected that have curved surfaces. .
［発明の効果］
以上説明したように本発明によれば、互いに直
交する複数の第１および第２のマーカーを埋設し
た放射線透過試験機用基準ゲージを用いることに
よつて、鋼管等のように表面がたとえ曲面に形成
された被検査体であつたとしても、内部に存在す
る欠陥の位置および寸法を精度良くかつ簡単に測
定できる。[Effects of the Invention] As explained above, according to the present invention, by using a reference gauge for a radiographic testing machine in which a plurality of first and second markers that are perpendicular to each other are embedded, it is possible to Even if the surface of the object to be inspected is formed into a curved surface, the position and size of defects existing inside the object can be precisely and easily measured.
第１図乃至第３図は従来の放射線透過試験機で
欠陥を測定する時の測定手順を示す図、第４図お
よび第５図も従来の放射線透過試験機で欠陥を測
定する時の測定手順を示す図、第６図および第７
図は従来の放射線透過試験機における鋼管の欠陥
測定を説明するための図、第８図ａは本発明の一
実施例の放射線透過試験機用基準ゲージの一部を
示す平面図、同図ｂは同基準ゲージを示す立面
図、第９図は同基準ゲージを用いた放射線透過試
験機を示す図、第１０図は放射線フイルムを示す
図である。
１……鋼板、２，１３ａ，１３ｂ……欠陥、４
……放射線フイルム、６……放射線源、７……放
射線、８，９，１０，１１，１４ａ，１４ｂ，２
８，２９，３０，３１……像、１２……鋼管、２
１……帯状支持物体、２２……第１のマーカー、
２３……第２のマーカー、２４……基準ゲージ、
２５……接続部、２６……環状欠陥、２７……ス
ペーサ。
Figures 1 to 3 are diagrams showing the measurement procedure when measuring defects using a conventional radiographic testing machine, and Figures 4 and 5 are also diagrams showing the measuring procedure when measuring defects using a conventional radiographic testing machine. Figures 6 and 7 showing
The figure is a diagram for explaining defect measurement of steel pipes using a conventional radiographic testing machine, Figure 8a is a plan view showing a part of a reference gauge for a radiographic testing machine according to an embodiment of the present invention, and Figure 8b 9 is an elevational view showing the reference gauge, FIG. 9 is a diagram showing a radiation transmission tester using the same reference gauge, and FIG. 10 is a diagram showing a radiation film. 1... Steel plate, 2, 13a, 13b... Defect, 4
...Radiation film, 6...Radiation source, 7...Radiation, 8, 9, 10, 11, 14a, 14b, 2
8, 29, 30, 31...Statue, 12...Steel pipe, 2
1... Band-shaped support object, 22... First marker,
23...Second marker, 24...Reference gauge,
25... Connection portion, 26... Annular defect, 27... Spacer.
Claims (1)
間に介挿して前記被検査体内に存在する欠陥を検
出する放射線透過試験機において、前記被検査体
と前記放射線感光材との間に介挿され、可撓性を
有した板状支持物体と、この板状支持物体内の厚
み方向に埋設された複数の第１の重金属製棒状マ
ーカーと、前記板状支持物体内の前記厚み方向に
対して直角方向に埋設された複数の第２の重金属
製棒状マーカーとで構成されたことを特徴とする
放射線透過試験機用基準ゲージ。1. In a radiation transmission testing machine that detects defects existing in the inspected object by inserting an object to be inspected between a radiation source and a radiation-sensitive material, a flexible plate-shaped support object, a plurality of first heavy metal bar-shaped markers embedded in the thickness direction of the plate-shaped support object; A reference gauge for a radiographic testing machine, comprising a plurality of second heavy metal rod-shaped markers embedded in a direction perpendicular to the reference gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59102047A JPS60244843A (en) | 1984-05-21 | 1984-05-21 | Reference gauge for radiographic testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59102047A JPS60244843A (en) | 1984-05-21 | 1984-05-21 | Reference gauge for radiographic testing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60244843A JPS60244843A (en) | 1985-12-04 |
| JPH0522841B2 true JPH0522841B2 (en) | 1993-03-30 |
Family
ID=14316852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59102047A Granted JPS60244843A (en) | 1984-05-21 | 1984-05-21 | Reference gauge for radiographic testing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60244843A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO308630B1 (en) * | 1996-09-19 | 2000-10-02 | Norske Stats Oljeselskap | Pipeline inspection system |
-
1984
- 1984-05-21 JP JP59102047A patent/JPS60244843A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60244843A (en) | 1985-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5161413A (en) | Apparatus and method for guided inspection of an object | |
| GB1586581A (en) | Pipeline inspection equipment | |
| BR112019001624B1 (en) | METHOD FOR DETERMINING GEOMETRIC PARAMETERS AND/OR STATE OF OBJECTIVE MATERIAL UNDER RADIOGRAPHY STUDY | |
| JPH0522841B2 (en) | ||
| US9354205B2 (en) | Method and sensor mount for measuring seam peaking in pipes by means of ultrasonic inspection | |
| KR102067531B1 (en) | Residual Stress Measurement Apparatus for Tubular Type Electric Power Transmission Tower | |
| JP3199417B2 (en) | Standard specimen for non-destructive inspection of piping | |
| JP2594835B2 (en) | A method of extracting the thinned part of a double-walled pipe made of dissimilar materials and measuring the thickness of the thinned part | |
| CN100495002C (en) | Defect depth detecting method based on ray real-time imaging | |
| JPS6161086A (en) | Probing method for radiation absorbing body in structure | |
| CN112326799A (en) | Method for applying phased array technology to pressure pipeline regular inspection and grading | |
| US10408615B2 (en) | Method of inspecting a degraded area of a metal structure covered by a composite repair and method of measuring a remaining wall thickness of a composite structure | |
| JP6170473B2 (en) | Thinning inspection method for part of buried structure | |
| JPH01110251A (en) | Evaluation of integrity for one-side weld part | |
| Allard et al. | Pipeline external corrosion analysis using a 3D laser scanner | |
| RU203109U1 (en) | A universal sample for increasing the accuracy of measurements by ultrasonic thickness gauges and developing the skills of specialists in identifying corrosion defects of the inner surface of gas pipelines | |
| Harara | Corrosion evaluation and wall thickness measurement on large-diameter pipes by tangential radiography using a Co-60 gamma-ray source | |
| JP3792322B2 (en) | Method for estimating pipe thinning depth | |
| Harara | Pit-depth measurement on large diameter pipes by tangential radiography using a Co-60 gamma-ray source | |
| WO2023223002A1 (en) | Metal oxidation determining apparatus | |
| RU2653955C1 (en) | Method for determining voltage supply and coordinates in heat-affected zones of pipelines by the method for measuring velocity of passage of ultrasonic wave | |
| KR200346952Y1 (en) | Source-film fixing equipment for radiography to pipe-line | |
| JP3147272B2 (en) | Defect height measurement method for ultrasonic flaw detector | |
| JPH0357432B2 (en) | ||
| PIRON et al. | Innovation in 3D scanning technology and software is pushing the limits of complex corrosion and mechanical damage assessment on pipelines. |