JPH0735729A - Ultrasonic flaw detector at welded part - Google Patents
Ultrasonic flaw detector at welded partInfo
- Publication number
- JPH0735729A JPH0735729A JP5202668A JP20266893A JPH0735729A JP H0735729 A JPH0735729 A JP H0735729A JP 5202668 A JP5202668 A JP 5202668A JP 20266893 A JP20266893 A JP 20266893A JP H0735729 A JPH0735729 A JP H0735729A
- Authority
- JP
- Japan
- Prior art keywords
- welded
- ultrasonic flaw
- ultrasonic
- point
- welded part
- 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.)
- Granted
Links
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
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、溶接管の溶接部にお
ける微小ブローホールを検出するための溶接部の超音波
探傷装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic flaw detector for a welded portion for detecting minute blowholes in the welded portion.
【0002】[0002]
【従来の技術】溶接部のブローホールを検出する方法と
しては、従来一般にX線透過法が採用されている。この
X線透過法は、検査ヵ所にフイルムを貼ってX線を溶接
部に照射させ、X線の透過線量の差異に基づいて欠陥を
識別するため、ブローホールに対する検出能は優れてい
るが、検査能率が極めて悪く、全長全数検査することは
困難である。さらに、X線透過法は、フイルム等の消耗
コストが高く、また、放射線に対する安全管理等の問題
を有している。2. Description of the Related Art As a method for detecting blowholes in a welded portion, an X-ray transmission method has been generally used conventionally. This X-ray transmission method is excellent in detectability for blowholes, because a film is attached to the inspection site, X-rays are irradiated to the welded portion, and defects are identified based on the difference in the X-ray transmission dose. The inspection efficiency is extremely poor, and it is difficult to perform 100% inspection of the entire length. Further, the X-ray transmission method has a high consumption cost of the film and the like, and has problems such as safety management against radiation.
【0003】一方、金属表面にレーザビームを照射して
シーム溶接するレーザ溶接においては、溶接部の溶接欠
陥を検出する方法として、突合せ部位の溶け込み不良を
レーザビームを照射するノズルの先端に設けられた温度
センサからの出力に基づいて検知する方法(特開平2−
255288号公報)、溶接加工中の物体を保持する保
持部に付設された鍔を有し、該鍔を超音波に対し減衰の
少ない液体中に浸して、超音波センサは前記液体中を伝
播する超音波信号を検出する装置(特開平3−8581
号公報)、予め良好な溶接部の形状を計測してその値を
記憶装置に記憶しておき、溶接品質判定に供する溶接継
手部の形状を計測し、その値を記憶装置の値と比較照合
し、溶接品質の良否を判定する方法(特開平3−189
083号公報)等が提案されている。On the other hand, in laser welding in which seam welding is performed by irradiating a metal surface with a laser beam, as a method of detecting a welding defect in a welded portion, a defective fusion at a butt portion is provided at a tip of a nozzle for irradiating a laser beam. Method based on the output from the temperature sensor (JP-A-2-
255288) has a collar attached to a holding portion for holding an object being welded, and the ultrasonic sensor propagates in the liquid by immersing the collar in a liquid that is less attenuated by ultrasonic waves. Device for detecting ultrasonic signals (Japanese Patent Laid-Open No. 3-8581)
Gazette), the shape of a good weld is measured in advance and the value is stored in a storage device, the shape of a welded joint used for welding quality determination is measured, and the value is compared and compared with the value in the storage device. Method for determining the quality of welding (Japanese Patent Laid-Open No. 3-189)
No. 083) has been proposed.
【0004】[0004]
【発明が解決しようとする課題】電気抵抗溶接では、ア
ップセットの突き合わせ力によって、ブローホールは密
着されるため発生しない。しかしながら、レーザ溶接管
の溶接部においては、通常の電気抵抗溶接に比べて溶接
時のアップセットを行わないため、雰囲気ガスを溶接部
に巻き込むためブローホールが発生し易く、溶接状態に
よって0.1〜1mm程度のブローホールが点在または
連続して発生することがある。これに対して超音波によ
るレーザ溶接部に発生するブローホールの検出は、その
形状が球状欠陥であるため、超音波の反射量が極めて小
さく困難であった。In the electric resistance welding, the blow holes are brought into close contact with each other by the butting force of the upset, so that they do not occur. However, in the welded portion of the laser-welded pipe, since upsetting during welding is not performed as compared with normal electric resistance welding, an atmospheric gas is entrained in the welded portion, so that blowholes are easily generated. Blowholes of about 1 mm may be scattered or continuously generated. On the other hand, it is difficult to detect blowholes generated in the laser welded portion by ultrasonic waves because the shape of the blowholes is a spherical defect and the amount of ultrasonic waves reflected is extremely small.
【0005】また、上記特開平2−255288号公報
に開示の方法は、溶接突合わせ部位の溶け込み不良を検
出するもので、溶接部のブローホールを検出することは
不可能である。また、特開平3−8581号公報に開示
の装置は、レーザ溶接時にアコースティックエミッショ
ンにより発生する超音波(約150KHz)が内部欠陥
の有無により変化するのを利用したもので、溶接部のブ
ローホールを検出することは不可能である。さらに、特
開平3−189083号公報に開示の方法は、溶接品質
の良否を判定できるが、前記と同様に溶接部のブローホ
ールを検出することは不可能である。Further, the method disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-255288 is to detect a defective fusion at a welded butted portion, and it is impossible to detect a blow hole in a welded portion. The device disclosed in Japanese Patent Laid-Open No. 3-8581 utilizes that ultrasonic waves (about 150 KHz) generated by acoustic emission during laser welding change depending on the presence or absence of internal defects. It is impossible to detect. Furthermore, the method disclosed in Japanese Patent Laid-Open No. 3-189083 can determine the quality of welding, but it is not possible to detect blowholes in the welded portion as described above.
【0006】この発明の目的は、溶接部に発生する0.
1mm以上のブローホールを超音波探傷試験により連続
的に検出できる溶接部の超音波探傷装置を提供すること
にある。An object of the present invention is to prevent the occurrence of welding defects in welds.
An object of the present invention is to provide an ultrasonic flaw detector for a welded portion capable of continuously detecting blow holes of 1 mm or more by an ultrasonic flaw detection test.
【0007】[0007]
【課題を解決するための手段】本発明者らは、上記目的
を達成すべくレーザ溶接管の溶接部に発生するブローホ
ールに対して、超音波探傷試験を種々試験し検討した。
その結果、周波数帯域が広帯域で周波数20〜80MH
zの点集束型探触子を用い、超音波の点集束位置を溶接
部肉厚方向に3mm以下のピッチになるように複数個の
探触子を溶接線に沿う直線上に配置することによって、
溶接部の0.1mm以上のブローホールを超音波探傷に
より連続的に検出できることを究明し、この発明に到達
した。DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted various ultrasonic flaw detection tests on a blowhole generated in a welded portion of a laser welded pipe in order to achieve the above-mentioned object and examined it.
As a result, the frequency band is wide and the frequency is 20 to 80 MH.
By using a z-point-focusing type probe and arranging a plurality of probes on a straight line along the welding line so that the point-focusing position of ultrasonic waves becomes a pitch of 3 mm or less in the thickness direction of the welded portion. ,
It was clarified that blowholes of 0.1 mm or more in the welded portion can be continuously detected by ultrasonic flaw detection, and the present invention was reached.
【0008】すなわちこの発明は、溶接管の溶接部に発
生するブローホールを超音波探傷により検出する溶接部
の超音波探傷装置において、周波数帯域が広帯域で周波
数20〜80MHzの点集束型探触子を用い、超音波の
点集束位置が溶接部肉厚方向に3mm以下のピッチとな
るよう複数個の探触子を溶接線に沿って配置することを
特徴とする溶接部の超音波探傷装置である。That is, according to the present invention, there is provided an ultrasonic flaw detector for a welded portion for detecting blowholes generated in a welded portion of a welded pipe by ultrasonic flaw detection. The point-focusing probe has a wide frequency band and a frequency of 20 to 80 MHz. An ultrasonic flaw detector for a welding part, characterized in that a plurality of probes are arranged along the welding line so that the point focusing position of the ultrasonic wave has a pitch of 3 mm or less in the thickness direction of the welding part. is there.
【0009】[0009]
【作用】この発明においては、周波数帯域が広帯域で周
波数20〜80MHzとすることによって、S/N比の
良い短い波長の超音波を発生させ、かつ、点集束型探触
子を用いてビームを絞ることによって、従来超音波では
困難とされていた微小なブローホールの検出が可能とな
る。さらに、超音波の点集束位置が溶接部肉厚方向に3
mm以下のピッチになるように複数個の探触子を溶接線
に沿う直線上に配置するから、溶接部の肉厚方向全体に
亘って0.1mm以上のブローホールを連続的に検出す
ることができる。In the present invention, the frequency band is wide and the frequency is from 20 to 80 MHz, so that an ultrasonic wave of a short wavelength having a good S / N ratio is generated and a beam is formed using a point-focusing type probe. By narrowing down, it becomes possible to detect minute blowholes, which were conventionally difficult with ultrasonic waves. Furthermore, the point focusing position of ultrasonic waves is 3 in the thickness direction of the weld.
Since multiple probes are arranged on a straight line along the weld line so that the pitch is less than or equal to mm, it is necessary to continuously detect blow holes of 0.1 mm or more over the entire thickness direction of the weld. You can
【0010】この発明において、周波数帯域を広帯域と
したのは、S/N比を向上させ、かつ、パルス幅を小さ
くして不感帯を短くし、溶接部の肉厚方向全体に亘って
探傷可能とするためである。また、周波数を20〜80
MHzとしてのは、20MHz未満では0.5mm以下
のブローホールの検出が困難となり、80MHzを超え
ると超音波の減衰が激しくなってS/N比が低下するた
めである。さらに、探触子として点集束型を用いたの
は、ビームを集中させることによって微小欠陥検出のS
/N比を向上させるためである。In the present invention, the reason why the frequency band is wide is that the S / N ratio is improved, the pulse width is reduced to shorten the dead zone, and flaw detection is possible over the entire thickness direction of the welded portion. This is because Also, set the frequency to 20-80
The reason for setting the MHz is that it is difficult to detect a blowhole of 0.5 mm or less when the frequency is less than 20 MHz, and the attenuation of ultrasonic waves becomes severe and the S / N ratio decreases when the frequency exceeds 80 MHz. Furthermore, the point-focusing type is used as the probe because the beam is focused to detect S
This is to improve the / N ratio.
【0011】[0011]
実施例1 以下にこの発明の詳細を実施の一例を示す図1ないし図
5に基づいて説明する。図1は水浸法超音波探傷法にお
ける探触子と被検材である鋼管との配置関係を示す模式
図、図2は水浸法超音波探傷法における受信エコー波形
図、図3は被検材の鋼管の溶接線に沿って配置する複数
の探触子の配置例を示すもので、(a)図は先頭、
(b)図は真中、(c)図は最後の探触子の配置の模式
図、図4は図3(b)におけるブローホールの大きさと
エコー高さとの関係を示すグラフ、図5は点集束位置か
ら外れた場合の感度変化量のグラフである。Embodiment 1 Details of the present invention will be described below with reference to FIGS. 1 to 5 showing an embodiment. FIG. 1 is a schematic diagram showing a positional relationship between a probe and a steel pipe as a test material in the water immersion ultrasonic flaw detection method, FIG. 2 is a received echo waveform diagram in the water immersion ultrasonic flaw detection method, and FIG. An example of the arrangement of a plurality of probes arranged along the welding line of the steel pipe for inspection is shown.
(B) is the center, (c) is a schematic view of the last probe arrangement, FIG. 4 is a graph showing the relationship between the blowhole size and echo height in FIG. 3 (b), and FIG. 5 is a dot. It is a graph of the amount of change in sensitivity when deviating from the focus position.
【0012】図1において、1は周波数帯域幅が広帯域
の点集束型水浸用垂直探触子、2は被検材であるレーザ
溶接鋼管、3はレーザ溶接鋼管2のレーザ溶接部、4は
レーザ溶接部3に形成されたブローホール、5は接触媒
質の水である。図1の水浸法超音波探傷法により、直径
5mm、点集束距離25mmの周波数帯域幅が広帯域の
点集束型水浸用垂直探触子1を、レーザ溶接部3に0.
3mmのブローホールを有する直径50.8mm、肉厚
6.0mmのレーザ溶接鋼管2に対し水距離13mmで
配置し、点集束型水浸用垂直探触子1から垂直にレーザ
溶接部3に超音波ビームを送信したところ、図2に示す
受信エコーが得られた。なお、図2中のTは送信パル
ス、Sは表面エコー、Fは欠陥エコー、Bは底面エコー
を示す。図2に示すとおり、0.3mmのブローホール
をS/N比良く検出している。In FIG. 1, 1 is a point-focusing type vertical probe for water immersion having a wide frequency bandwidth, 2 is a laser welded steel pipe as a material to be inspected, 3 is a laser welded portion of a laser welded steel pipe 2, and 4 is a laser welded pipe. Blow holes 5 formed in the laser weld 3 are water as a contact medium. By the water immersion ultrasonic flaw detection method shown in FIG. 1, a point-focusing type vertical probe 1 for water immersion having a diameter of 5 mm and a point-focusing distance of 25 mm and a wide frequency bandwidth was formed on the laser welding portion 3.
The laser welding steel pipe 2 having a diameter of 50.8 mm and a wall thickness of 6.0 mm having a blow hole of 3 mm is arranged at a water distance of 13 mm, and the laser beam is vertically superposed on the laser welding portion 3 from the point focusing type vertical probe 1 for immersion. When the acoustic beam was transmitted, the reception echo shown in FIG. 2 was obtained. In FIG. 2, T is a transmission pulse, S is a surface echo, F is a defect echo, and B is a bottom echo. As shown in FIG. 2, a 0.3 mm blow hole is detected with a good S / N ratio.
【0013】上記点集束型水浸用垂直探触子1は、図3
に示すとおり、被検材であるレーザ溶接鋼管2のレーザ
溶接部3の溶接線に沿って3個を直線に並べ、先頭の点
集束型水浸用垂直探触子1-1は、(a)図に示すとお
り、水距離X、管肉厚中における超音波ビームの点集束
位置xで、真中の点集束型水浸用垂直探触子1-2は、、
(b)図に示すとおり、水距離Y、管肉厚中における超
音波ビームの点集束位置yで、最後の点集束型水浸用垂
直探触子1-3は、(c)図に示すとおり、水距離Z、管
肉厚中における超音波ビームの点集束位置zで配置し、
各点集束型水浸用垂直探触子1-1、1-2、1-3が点集束
位置から所定範囲をカバーすることにより、レーザ溶接
鋼管2の肉中を均一に探傷できるよう構成する。The point-focusing type vertical probe 1 for immersion is shown in FIG.
As shown in FIG. 3, three pieces are arranged in a straight line along the welding line of the laser welded portion 3 of the laser welded steel pipe 2 as the test material, and the leading point-focusing type vertical probe for water immersion 1 -1 is (a ) as shown, the water distance X, in that the focusing position x of the ultrasonic beam in the pipe wall Atsunaka, the vertical probe 1 -2 for immersion point focusing type water middle ,,
(B) As shown, the water distance Y, in that the focusing position y of the ultrasonic beam in the tube wall Atsunaka, probe 1 -3 probe vertically for converging Immersion last point, shown in (c) FIG. As described above, the water distance Z is set at the point focusing position z of the ultrasonic beam in the pipe wall thickness,
Each point-focusing type vertical probe for water immersion 1 -1 , 1 -2 , 1 -3 covers a predetermined range from the point-focusing position so that flaw detection can be performed evenly in the meat of the laser welded steel pipe 2. .
【0014】直径5mm、点集束距離25mmの周波数
帯域幅が広帯域の点集束型水浸用垂直探触子1を、直径
50.8mm、肉厚6.0mmのレーザ溶接鋼管2に対
し水距離13mmで配置し、点集束型水浸用垂直探触子
1から垂直にレーザ溶接部3に超音波ビームを送信して
探傷した場合のブローホールの大きさとエコー高さとの
関係および点集束位置から肉厚方向に±0〜2mm離れ
た位置でのエコー高さを調査した。その結果を図4およ
び図5に示す。図4に示すとおり、微小なブローホール
に対し、S/N比良く検出している。また、図5に示す
とおり、点集束位置から肉厚方向に±1.5mmずれる
ことによって、−3dBの感度低下を示した。A point-focusing type vertical probe 1 for water immersion having a wide frequency band width of 5 mm in diameter and 25 mm in point-focusing distance is 13 mm in water distance from a laser-welded steel pipe 2 having a diameter of 50.8 mm and a wall thickness of 6.0 mm. , And the relationship between the size of the blowhole and the echo height when the ultrasonic beam is vertically transmitted from the point-focusing type water immersion vertical probe 1 to the laser welding part 3 and the point-focusing position The echo height was investigated at a position separated by ± 0 to 2 mm in the thickness direction. The results are shown in FIGS. 4 and 5. As shown in FIG. 4, even a small blow hole is detected with a good S / N ratio. Further, as shown in FIG. 5, a sensitivity decrease of −3 dB was shown by deviating ± 1.5 mm from the point focusing position in the thickness direction.
【0015】上記のとおり構成したことによって、例え
ば、直径50.8mm、肉厚6.0mmのレーザ溶接鋼
管2のレーザ溶接部3の超音波探傷を行うに際し、各点
集束型水浸用垂直探触子1-1、1-2、1-3の水距離Xを
19mm、Yを13mm、Zを7mmに調整し、管肉厚
中における超音波ビームの点集束位置xを1.5mm、
yを3mm、zを4.5mmに設定すれば、各点集束型
水浸用垂直探触子1-1、1-2、1-3は±1.5mmをカ
バーすることとなり、鋼管2の肉中を均一にS/N比高
く探傷することができる。With the above construction, for example, when ultrasonic flaw detection is performed on the laser welded portion 3 of the laser welded steel pipe 2 having a diameter of 50.8 mm and a wall thickness of 6.0 mm, each point-focused vertical probe for water immersion is used. The water distance X of the tentacles 1 -1 , 1 -2 , 1 -3 was adjusted to 19 mm, Y was 13 mm, and Z was 7 mm, and the point focusing position x of the ultrasonic beam in the wall thickness of the tube was 1.5 mm,
If y is set to 3 mm and z is set to 4.5 mm, the point-focusing type vertical probes for water immersion 1 -1 , 1 -2 , and 1 -3 cover ± 1.5 mm. It is possible to detect flaws uniformly in meat with a high S / N ratio.
【0016】[0016]
【発明の効果】以上述べたとおり、この発明によれば、
従来超音波探傷では困難といわれていたレーザ溶接鋼管
の溶接部の微小なブローホールを、S/N比よく連続的
に検出することができ、レーザ溶接鋼管の溶接部を超音
波探傷による連続自動検出を行うことが可能となる。As described above, according to the present invention,
It is possible to continuously detect minute blowholes in the welded part of a laser welded steel pipe with a good S / N ratio, which was previously said to be difficult with ultrasonic flaw detection, and the welded part of the laser welded steel pipe can be automatically detected by ultrasonic flaw detection. It becomes possible to perform detection.
【図1】水浸法超音波探傷法における探触子と被検材で
ある鋼管との配置関係を示す模式図である。FIG. 1 is a schematic diagram showing a positional relationship between a probe and a steel pipe as a test material in a water immersion ultrasonic flaw detection method.
【図2】水浸法超音波探傷法における受信エコー波形図
である。FIG. 2 is a received echo waveform diagram in a water immersion ultrasonic flaw detection method.
【図3】被検材の鋼管の溶接線に沿って配置する複数の
探触子の配置例を示すもので、(a)図は先頭、(b)
図は真中、(c)図は最後の探触子の配置図である。FIG. 3 shows an arrangement example of a plurality of probes arranged along a welding line of a steel pipe of a material to be inspected, in which (a) is a head and (b) is a figure.
The figure is the center, and the figure (c) is a layout of the last probe.
【図4】ブローホールの大きさとエコー高さとの関係を
示すグラフである。FIG. 4 is a graph showing the relationship between blowhole size and echo height.
【図5】集束位置から外れた場合の感度変化量のグラフ
である。FIG. 5 is a graph of a sensitivity change amount when the focus position deviates.
1、1-1、1-2、1-3 点集束型水浸用垂直探触子 2 レーザ溶接鋼管 3 レーザ溶接部 4 ブローホール 5 水 T 送信パルス S 表面エコー F 欠陥エコー B 底面エコー X、Y、Z 水距離 x、y、z 管肉厚中における超音波ビームの点集束位
置1, 1 -1 , 1 -2 , 1 -3 Point-focusing vertical probe for water immersion 2 Laser welded steel pipe 3 Laser weld 4 Blowhole 5 Water T Transmitting pulse S Surface echo F Defect echo B Bottom echo X, Y, Z Water distance x, y, z Point focusing position of ultrasonic beam in tube wall thickness
Claims (1)
を超音波探傷により検出する溶接部の超音波探傷装置に
おいて、周波数帯域が広帯域で周波数20〜80MHz
の点集束型探触子を用い、超音波の点集束位置が溶接部
肉厚方向に3mm以下のピッチとなるよう複数個の探触
子を溶接線に沿って配置することを特徴とする溶接部の
超音波探傷装置。1. An ultrasonic flaw detector for a welded portion for detecting blowholes generated in the welded portion of a welded pipe by ultrasonic flaw detection, wherein the frequency band is wide and the frequency is 20-80 MHz.
Welding, characterized in that a plurality of probes are arranged along the welding line so that the point focusing positions of ultrasonic waves have a pitch of 3 mm or less in the wall thickness direction of the welded part. Ultrasonic flaw detector.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5202668A JP2682390B2 (en) | 1993-07-22 | 1993-07-22 | Ultrasonic flaw detector for welds |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5202668A JP2682390B2 (en) | 1993-07-22 | 1993-07-22 | Ultrasonic flaw detector for welds |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0735729A true JPH0735729A (en) | 1995-02-07 |
JP2682390B2 JP2682390B2 (en) | 1997-11-26 |
Family
ID=16461176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5202668A Expired - Fee Related JP2682390B2 (en) | 1993-07-22 | 1993-07-22 | Ultrasonic flaw detector for welds |
Country Status (1)
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JP (1) | JP2682390B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008105112A1 (en) | 2007-02-28 | 2008-09-04 | Jfe Steel Corporation | Method for managing quality of tubular body and tubular body manufacturing method |
WO2008105109A1 (en) | 2007-02-28 | 2008-09-04 | Jfe Steel Corporation | Calibration method of ultrasonic flaw detection and quality control method and production method of tubular body |
WO2008105111A1 (en) | 2007-02-28 | 2008-09-04 | Jfe Steel Corporation | Tubular object ultrasonic test device and ultrasonic test method |
US7779694B2 (en) | 2005-11-21 | 2010-08-24 | Jfe Steel Corporation | Ultrasonic testing system and ultrasonic testing technique for pipe member |
JP2015141075A (en) * | 2014-01-28 | 2015-08-03 | Jfeスチール株式会社 | Method for forming standard test piece for ultrasonic flaw detection of weld zone of laser welded steel tube |
-
1993
- 1993-07-22 JP JP5202668A patent/JP2682390B2/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7779694B2 (en) | 2005-11-21 | 2010-08-24 | Jfe Steel Corporation | Ultrasonic testing system and ultrasonic testing technique for pipe member |
WO2008105112A1 (en) | 2007-02-28 | 2008-09-04 | Jfe Steel Corporation | Method for managing quality of tubular body and tubular body manufacturing method |
WO2008105109A1 (en) | 2007-02-28 | 2008-09-04 | Jfe Steel Corporation | Calibration method of ultrasonic flaw detection and quality control method and production method of tubular body |
WO2008105111A1 (en) | 2007-02-28 | 2008-09-04 | Jfe Steel Corporation | Tubular object ultrasonic test device and ultrasonic test method |
US8266964B2 (en) | 2007-02-28 | 2012-09-18 | Jfe Steel Corporation | Calibration of an ultrasonic flaw detector and quality control and production methods for a tubular body |
US8393217B2 (en) | 2007-02-28 | 2013-03-12 | Jfe Steel Corporation | Ultrasonic flaw detection apparatus and ultrasonic flaw detection method for pipe |
US8578580B2 (en) | 2007-02-28 | 2013-11-12 | Jfe Steel Corporation | Quality control method and manufacturing method for pipe |
JP2015141075A (en) * | 2014-01-28 | 2015-08-03 | Jfeスチール株式会社 | Method for forming standard test piece for ultrasonic flaw detection of weld zone of laser welded steel tube |
Also Published As
Publication number | Publication date |
---|---|
JP2682390B2 (en) | 1997-11-26 |
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