JP3023642B2 - Insertion depth measurement method for welded pipe joints - Google Patents
Insertion depth measurement method for welded pipe jointsInfo
- Publication number
- JP3023642B2 JP3023642B2 JP5301206A JP30120693A JP3023642B2 JP 3023642 B2 JP3023642 B2 JP 3023642B2 JP 5301206 A JP5301206 A JP 5301206A JP 30120693 A JP30120693 A JP 30120693A JP 3023642 B2 JP3023642 B2 JP 3023642B2
- Authority
- JP
- Japan
- Prior art keywords
- wedge
- insertion depth
- transmission
- receiving
- pipe
- 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
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- 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
- G01N2291/028—Material parameters
- G01N2291/02854—Length, thickness
-
- 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
- Physics & Mathematics (AREA)
- Acoustics & Sound (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)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、溶接式管継手における
差し込み深さ測定方法に係り、更に詳しくは、安全で管
理がし易く、しかも低コスト化が図れて手軽に使用でき
る溶接式管継手における差し込み深さ測定方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the insertion depth of a welded pipe joint, and more particularly to a welded pipe joint which is safe and easy to manage, and which can be used at low cost. The present invention relates to a method for measuring the insertion depth.
【0002】[0002]
【従来の技術】差し込み溶接式のカップリングなどに配
管を溶接する際には、カップリングなどの配管差し込み
部の端面と、差し込まれた配管の端面との間に、規定に
より1〜3mmの隙間を設けなければならない。これ
は、仮に隙間がなかったり小さければ、溶接入熱により
配管が伸びて部材に残留応力が発生し、溶接ルート部に
欠陥が発生し易くなり、また隙間が大きすぎると溶接継
手の強度が低下してしまうからである。そこで、溶接後
に規定通りの隙間が形成されているか否かの検査が行わ
れるが、この検査方法として従来、X線検査方法が知ら
れている。2. Description of the Related Art When welding a pipe to an insertion welding type coupling or the like, a gap of 1 to 3 mm is defined between the end face of the pipe insertion part such as the coupling and the end face of the inserted pipe. Must be provided. This is because if there is no gap or if the gap is small, the pipe will expand due to heat input from welding and residual stress will be generated in the member, defects will easily occur in the welding root part, and if the gap is too large, the strength of the welded joint will decrease. Because it will. Therefore, an inspection is performed to determine whether a prescribed gap is formed after welding, and an X-ray inspection method is conventionally known as this inspection method.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、前記従
来のX線検査方法では、高価でしかも慎重な取扱いを要
するX線検査装置が必要であり、装置も大型になるので
移動がし難く、手軽に使用できなかった。本発明はこの
ような事情に鑑みてなされたもので、安全で管理がし易
く、しかも低コスト化が図れて、軽量で手軽に使用でき
る溶接式管継手における差し込み深さ測定方法を提供す
ることを目的とする。However, the above-mentioned conventional X-ray inspection method requires an X-ray inspection apparatus which is expensive and requires careful handling. Could not be used. The present invention has been made in view of the above circumstances, and provides a method for measuring the insertion depth of a welded pipe joint that is safe, easy to manage, and cost-effective, and is lightweight and easy to use. With the goal.
【0004】[0004]
【課題を解決するための手段】前記目的に沿う請求項1
記載の溶接式管継手における差し込み深さ測定方法は、
送信側くさびに送信振動子が取付けられた送信部が探傷
方向前側に、受信側くさびに前記送信振動子と平行な受
信振動子が取付けられた受信部が探傷方向後側に設けら
れ、更に前記送信部および前記受信部を仕切る吸音材と
これらを収納するケーシングとを備えた斜角探触子を用
いた溶接式管継手における差し込み深さ測定方法であっ
て、前記送信振動子から、斜角屈折角75〜80度で超
音波の横波を溶接側の配管の端面に向かって発射し、溶
接部を避けて1または2回以上の反射後に前記溶接側の
端面で反射された反射エコーを、さらに1または2回以
上の反射後に前記送信側くさびの背後に配置された前記
受信側くさびに取付けられた受信振動子により受信し
て、前記超音波の送信から受信までの伝搬時間により前
記配管の差し込み深さを測定する。According to the present invention, there is provided a semiconductor device comprising:
Insertion depth measurement method in the described welded pipe joint,
A transmitting unit with a transmitting oscillator attached to the transmitting wedge is provided on the front side in the flaw detection direction, and a receiving unit with a receiving oscillator parallel to the transmitting oscillator attached to the receiving wedge is provided on the rear side in the flaw detecting direction. A method for measuring an insertion depth in a welded pipe joint using an oblique probe including a sound absorbing material separating a transmitting unit and the receiving unit and a casing accommodating them, comprising: A transverse wave of ultrasonic waves is emitted toward the end face of the pipe on the welding side at a refraction angle of 75 to 80 degrees, and a reflected echo reflected on the end face on the welding side after one or two or more reflections avoiding the welded portion, Further, after one or more reflections, the signal is received by a receiving vibrator attached to the receiving side wedge arranged behind the transmitting side wedge, and the propagation time of the ultrasonic wave is determined by the propagation time from transmission to reception of the ultrasonic wave. Insertion depth To measure.
【0005】[0005]
【作用】請求項1記載の溶接式管継手における差し込み
深さ測定方法においては、送信振動子から斜角屈折角7
5〜80度で超音波を溶接側の配管の端面に向かって発
射する。配管内に入射した横波は溶接部を避けて前記溶
接側の配管の端面で反射し、その反射エコーを1または
2回以上反射後に送信振動子の背後に配置された受信振
動子が受信するので、横波の送信から受信までの伝搬時
間から算出して配管の差し込み深さが測定できる。しか
も、このように前部に配置された送信振動子からの横波
の反射エコーが、後部に配置された受信振動子により受
信されるので、曲率半径の小さい配管であっても送信側
くさびと受信側くさびの中央部分を直接配管に当接させ
て測定でき、これにより測定感度を向上できる。According to the first aspect of the present invention, there is provided a method for measuring an insertion depth in a welded pipe joint.
Ultrasonic waves are emitted at 5 to 80 degrees toward the end face of the pipe on the welding side. The transverse wave incident into the pipe is reflected at the end face of the pipe on the welding side, avoiding the weld, and the reflected echo is reflected by the receiving oscillator disposed behind the transmitting oscillator after being reflected one or more times. The insertion depth of the pipe can be measured by calculating from the propagation time from transmission to reception of the shear wave. In addition, since the reflected echo of the transverse wave from the transmitting oscillator arranged in the front part is received by the receiving oscillator arranged in the rear part, even if the pipe has a small radius of curvature, the transmitting side wedge and the receiving part are received. The measurement can be performed by directly contacting the central portion of the side wedge with the pipe, thereby improving the measurement sensitivity.
【0006】[0006]
【実施例】続いて、添付した図面を参照しつつ、本発明
を具体化した実施例につき説明し、本発明の理解に供す
る。ここに、図1は本発明の一実施例に係る溶接式管継
手における差し込み深さ測定用の斜角探触子の使用状態
を示す拡大断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is an enlarged sectional view showing a use state of the oblique probe for measuring the insertion depth in the welded pipe joint according to one embodiment of the present invention.
【0007】図1に示すように、本発明の一実施例に使
用する溶接式管継手における差し込み深さ測定用の斜角
探触子10は、斜角探触子10の前部に配置されて、送
信側くさび11に超音波を発生させる平板状の送信振動
子12が取付けられた送信部13と、斜角探触子10の
後部に配置されて、受信側くさび14に送信振動子12
と平行な平板状の受信振動子15が取付けられた受信部
16と、送信部13および受信部16を仕切る斜め前方
に下方傾斜する吸音材17と、これらを収納するステン
レス製のケーシング18とを備えている。As shown in FIG. 1, a bevel probe 10 for measuring the insertion depth in a welded pipe joint used in one embodiment of the present invention is disposed at the front of the bevel probe 10. A transmission unit 13 having a transmission wedge 11 for generating an ultrasonic wave attached to the transmission wedge 11 and a transmission wedge 14 disposed at the rear of the oblique probe 10 and attached to the reception wedge 14.
A receiving section 16 on which a flat-plate receiving vibrator 15 parallel to the above is mounted, a sound absorbing material 17 which inclines diagonally forward and downward to partition the transmitting section 13 and the receiving section 16, and a stainless steel casing 18 for accommodating them. Have.
【0008】送信側くさび11と受信側くさび14と
は、例えばアクリル系樹脂などの合成樹脂からなり、こ
れらの送受信側くさび11、14の下方傾斜する後方傾
斜面11a、14aに、それぞれ前記送信振動子12と
受信振動子15が取付けられている。これらの送信振動
子12や受信振動子15は、それぞれ例えばジルコンチ
タン酸鉛などの振動板の両面に電極が固着された周知の
振動子である。また、送信側くさび11や受信側くさび
14の下面はそれぞれ平坦面であるが、これに限定しな
くても例えば配管19の外周面に沿った湾曲面としても
よい。The transmitting wedge 11 and the receiving wedge 14 are made of, for example, a synthetic resin such as an acrylic resin. The transmitting wedges 11 and 14 are respectively provided on the rear inclined surfaces 11a and 14a which are inclined downward. The element 12 and the receiving vibrator 15 are attached. The transmitting vibrator 12 and the receiving vibrator 15 are well-known vibrators in which electrodes are fixed to both surfaces of a vibrating plate made of, for example, lead zircon titanate. Further, the lower surfaces of the transmission-side wedge 11 and the reception-side wedge 14 are flat surfaces, but are not limited thereto, and may be curved surfaces along the outer peripheral surface of the pipe 19, for example.
【0009】また、送信側くさび11の後方傾斜面11
aの傾斜角は、送信振動子12から発射された超音波の
横波が、角度θ(θ=75〜80度)で配管19内を伝
搬するように設定されており、受信側くさび14の後方
傾斜面14aの傾斜角も、反射エコーの取り込み角が同
じ角度θになるように設定されている。The rear inclined surface 11 of the transmitting side wedge 11
The inclination angle of “a” is set so that the transverse wave of the ultrasonic wave emitted from the transmitting transducer 12 propagates in the pipe 19 at an angle θ (θ = 75 to 80 degrees). The inclination angle of the inclined surface 14a is also set so that the reflection echo capturing angle becomes the same angle θ.
【0010】続いて、前記斜角探触子10を用いた本発
明の一実施例に係る溶接式管継手における差し込み深さ
測定方法を説明する。なお、実施例では配管19が溶接
される溶接式管継手としてカップリング20が採用され
ている。図1に示すように、配管19のカップリング2
0との溶接部21における差し込み深さを測定する場合
には、配管19の溶接部21側の端部にグリースなどの
接触媒質を塗布し、この塗布部に斜角探触子10の下面
を当てがいながら配管19の差し込み深さを測定する。Next, a method of measuring the insertion depth in a welded pipe joint according to an embodiment of the present invention using the angle probe 10 will be described. In the embodiment, the coupling 20 is adopted as a welded pipe joint to which the pipe 19 is welded. As shown in FIG.
When measuring the insertion depth at the welded portion 21 with 0, a couplant such as grease is applied to the end of the pipe 19 on the welded portion 21 side, and the lower surface of the bevel probe 10 is applied to this applied portion. The insertion depth of the pipe 19 is measured while applying.
【0011】すなわち、パルス電圧が印加された送信振
動子12から超音波が周期的に発生し、超音波のうちの
横波だけが、送信側くさび11を透過して配管19内に
入射角θで溶接側の配管19の端面に向かって伝搬す
る。これにより、横波だけによる高精度の測定ができ
る。That is, ultrasonic waves are periodically generated from the transmitting oscillator 12 to which the pulse voltage is applied, and only the transverse waves of the ultrasonic waves pass through the transmitting wedge 11 and enter the pipe 19 at the incident angle θ. The light propagates toward the end face of the pipe 19 on the welding side. As a result, high-precision measurement using only the transverse wave can be performed.
【0012】配管19内に入射した横波は、同図実線に
示すように配管19内を複数回反射しながら溶接部21
を避けて溶接側の配管19の端面で反射する。次いで、
反射エコーは、同図破線に示すように配管19の先端部
内を同様に溶接部21を避けて複数回反射し、配管19
の外周面から送信部13の背部に配置された受信部16
の受信側くさび14内に角度θで取り込まれて受信振動
子15を振動させることにより受信される。このよう
に、前側に配置された送信振動子12から発射された横
波の反射エコーが後側に配置された受信振動子15によ
り受信されるので、送信側くさび11と受信側くさび1
4の中央部分を直接配管19に当接させて測定でき、こ
れにより測定感度を向上できる。As shown by the solid line in FIG. 1, the transverse wave incident into the pipe 19 reflects inside the
And is reflected at the end face of the pipe 19 on the welding side. Then
The reflected echo is reflected a plurality of times inside the distal end of the pipe 19 similarly avoiding the welded portion 21 as shown by the broken line in FIG.
Receiving section 16 arranged on the back of transmitting section 13 from the outer peripheral surface of
Is received at an angle θ in the receiving side wedge 14 and vibrates the receiving vibrator 15. As described above, since the reflected echo of the transverse wave emitted from the transmitting oscillator 12 disposed on the front side is received by the receiving oscillator 15 disposed on the rear side, the transmitting wedge 11 and the receiving wedge 1 are received.
4 can be measured by directly contacting the central portion of the pipe 19 with the pipe 19, thereby improving the measurement sensitivity.
【0013】その後、図外のコンピュータにおいて、横
波の送信から受信までの時間により探触子10から配管
19の端面までの距離aが測定され、さらに溶接部の幅
bを差し引くことにより、配管19の差し込み深さcが
算出される。Thereafter, a computer (not shown) measures the distance a from the probe 10 to the end face of the pipe 19 based on the time from transmission to reception of the shear wave, and further subtracts the width b of the welded part to obtain the pipe 19. Is calculated.
【0014】このように、従来、配管の差し込み深さを
測定するのに使用されていた高価で取扱いや管理に慎重
さを必要とするX線検査装置に代えて、斜角探触子10
を有する検査装置を採用することにより、安全で管理が
し易く、しかも装置全体の低コスト化が図れる。また、
従来のX線検査装置は大型で移動が困難であったが、実
施例の斜角探触子10を採用したものはコンパクトで軽
量なので、どこにでも移動させて手軽に使用することが
できる。以上、本発明の実施例を説明したが、本発明は
この実施例に限定されるものではなく、要旨を逸脱しな
い範囲での設計変更があっても本発明に含まれる。As described above, instead of the expensive X-ray inspection apparatus which is conventionally used for measuring the insertion depth of the pipe and requires careful handling and management, the angle beam probe 10 is used.
By adopting the inspection apparatus having the above, the safety and ease of management can be improved, and the cost of the entire apparatus can be reduced. Also,
The conventional X-ray inspection apparatus is large and difficult to move, but the apparatus employing the angle beam probe 10 of the embodiment is compact and lightweight, so that it can be moved anywhere and used easily. Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and any change in design without departing from the scope of the present invention is included in the present invention.
【0015】[0015]
【発明の効果】請求項1記載の溶接式管継手における差
し込み深さ測定方法は、このように、超音波を用いて溶
接式管継手内に差し込まれる配管の端部の長さを測定す
るようにしたので、安全性が高く、取扱いや管理にさほ
ど慎重さが要らず、価格も安価になって低コスト化が図
れる。しかも、形状もコンパクトになり軽量化が図れ、
どこにでも移動させて手軽に使用できる。しかも、斜角
探触子の前部に送信振動子を後部に受信振動子を配置し
たので、送信側くさびと受信側くさびの中央部分を直接
配管に当接させて測定でき、これにより測定感度を向上
できる。The method for measuring the insertion depth of a welded pipe joint according to the first aspect of the present invention measures the length of the end of a pipe inserted into the welded pipe joint using ultrasonic waves. As a result, safety is high, handling and management are not required to be very careful, and the price is low and cost can be reduced. In addition, the shape is compact and lightweight,
It can be moved anywhere and used easily. In addition, since the transmitting transducer is located at the front of the bevel probe and the receiving transducer is located at the rear, the central part of the transmitting wedge and the central part of the receiving wedge can be directly contacted with the pipe for measurement, thereby increasing the measurement sensitivity. Can be improved.
【図1】本発明の一実施例に使用する斜角探触子の使用
状態を示す拡大断面図である。FIG. 1 is an enlarged sectional view showing a use state of an oblique probe used in an embodiment of the present invention.
10:斜角探触子、11:送信側くさび、11a:後方
傾斜面、12:送信振動子、13:送信部、14:受信
側くさび、14a:後方傾斜面、15:受信振動子、1
6:受信部、17:吸音材、18:ケーシング、19:
配管、20:カップリング、21:溶接部10: oblique probe, 11: transmission side wedge, 11a: rear inclined plane, 12: transmission oscillator, 13: transmission unit, 14: reception side wedge, 14a: rear inclined plane, 15: reception oscillator, 1
6: Receiver, 17: Sound absorbing material, 18: Casing, 19:
Piping, 20: coupling, 21: weld
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 健二 福岡県北九州市小倉北区井堀4丁目10番 13号 新日本非破壊検査株式会社内 (72)発明者 渡邉 邦道 神奈川県横浜市磯子区新杉田町8番地 株式会社東芝 横浜事業所内 (72)発明者 川股 邦夫 東京都港区西新橋3丁目7番1号 東芝 プラント建設株式会社内 (56)参考文献 特開 昭55−60812(JP,A) 特開 平6−317567(JP,A) 実開 平3−80362(JP,U) (58)調査した分野(Int.Cl.7,DB名) G01N 29/00 - 29/28 G01B 17/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Tanaka 4-10-13 Ibori, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Inside New Japan Non-Destructive Inspection Co., Ltd. (72) Inventor Kunichi Watanabe Isogo-ku, Yokohama-shi, Kanagawa 8 Shin-Sugita-cho Toshiba Corporation Yokohama Office (72) Inventor Kunio Kawamata 3-7-1 Nishi-Shimbashi, Minato-ku, Tokyo Toshiba Plant Construction Corporation (56) References JP-A-55-60812 (JP, A) JP-A-6-317567 (JP, A) JP-A-3-80362 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G01N 29/00-29/28 G01B 17 / 00
Claims (1)
た送信部が探傷方向前側に、受信側くさびに前記送信振
動子と平行な受信振動子が取付けられた受信部が探傷方
向後側に設けられ、更に前記送信部および前記受信部を
仕切る吸音材とこれらを収納するケーシングとを備えた
斜角探触子を用いた溶接式管継手における差し込み深さ
測定方法であって、 前記送信振動子から、斜角屈折角75〜80度で超音波
の横波を溶接側の配管の端面に向かって発射し、溶接部
を避けて1または2回以上の反射後に前記溶接側の端面
で反射された反射エコーを、さらに1または2回以上の
反射後に前記送信側くさびの背後に配置された前記受信
側くさびに取付けられた受信振動子により受信して、前
記超音波の送信から受信までの伝搬時間により前記配管
の差し込み深さを測定することを特徴とする溶接式管継
手における差し込み深さ測定方法。1. A transmission unit having a transmission wedge attached to a transmission side wedge is provided on the front side in the flaw detection direction, and a reception unit having a reception side wedge provided with a reception vibrator parallel to the transmission vibrator is provided on the rear side in the flaw detection direction. A method for measuring an insertion depth in a welded pipe joint using an oblique probe, further comprising: a sound absorbing material separating the transmitting unit and the receiving unit; and a casing accommodating the sound absorbing material. A transverse wave of an ultrasonic wave is emitted from the probe at an oblique refraction angle of 75 to 80 degrees toward the end face of the pipe on the welding side, and is reflected at the end face on the welding side after one or more times of reflection avoiding the welded portion. The reflected echo is received by a receiving vibrator attached to the receiving side wedge disposed behind the transmitting side wedge after one or more reflections, and propagated from transmission to reception of the ultrasonic wave. Depending on the time Insertion depth measuring method in the weld type pipe joint and measuring the insertion depth.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5301206A JP3023642B2 (en) | 1993-11-05 | 1993-11-05 | Insertion depth measurement method for welded pipe joints |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5301206A JP3023642B2 (en) | 1993-11-05 | 1993-11-05 | Insertion depth measurement method for welded pipe joints |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07128306A JPH07128306A (en) | 1995-05-19 |
JP3023642B2 true JP3023642B2 (en) | 2000-03-21 |
Family
ID=17894062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP5301206A Expired - Lifetime JP3023642B2 (en) | 1993-11-05 | 1993-11-05 | Insertion depth measurement method for welded pipe joints |
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JP (1) | JP3023642B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5243229B2 (en) * | 2008-12-24 | 2013-07-24 | 川田工業株式会社 | Ultrasonic flaw detection method and probe unit for ultrasonic flaw detector |
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1993
- 1993-11-05 JP JP5301206A patent/JP3023642B2/en not_active Expired - Lifetime
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JPH07128306A (en) | 1995-05-19 |
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