JP2008175577A - Method and device for monitoring welded part of electro-resistance-welded pipe and manufacturing method of electro-resistance-welded pipe - Google Patents

Method and device for monitoring welded part of electro-resistance-welded pipe and manufacturing method of electro-resistance-welded pipe Download PDF

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JP2008175577A
JP2008175577A JP2007007201A JP2007007201A JP2008175577A JP 2008175577 A JP2008175577 A JP 2008175577A JP 2007007201 A JP2007007201 A JP 2007007201A JP 2007007201 A JP2007007201 A JP 2007007201A JP 2008175577 A JP2008175577 A JP 2008175577A
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pipe
welded
cutting
bead
electro
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Hiromichi Hori
弘道 堀
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitor device capable of confirming the circumferential profile of a pipe inner surface and the image of the surface of the bead cut part of the pipe inner surface on the same monitor screen by device arrangement using a small-sized laser oscillator or imaging device. <P>SOLUTION: In a monitor method of the welded part of the electro-resistance-welded pipe, the surface of the inner surface welded part of the electro-resistance-welded pipe is irradiated with a laser beam or scanned by the laser beam; the obtained reflected beam is imaged by the imaging device and the circumferential profile of the pipe inner surface and the image of the surface of the bead cut part of the pipe inner surface are displayed on the same monitor screen. The monitor device of the welded part of the electro-resistance-welded pipe is equipped with the laser oscillator, a laser reflecting plate, a prism, the imaging device, a temperature regulator and the monitor screen. Further, a cutting and welding condition is controlled on the basis of monitor display data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、電縫溶接管製造時における管内面ビードの切削形状を監視する方法及び装置に関する。   The present invention relates to a method and an apparatus for monitoring the cutting shape of a pipe inner surface bead during the production of an electric resistance welded pipe.

電縫溶接管の溶接時に、圧接により管内外面に発生する電縫部のビードは、電縫溶接管の肉厚よりも盛り上がっており、このビードの形状は、製品での溶接部強度と関係があるため、通常電縫溶接後直ちにバイトにより除去される。   When welding an ERW welded pipe, the bead of the ERW generated on the inner and outer surfaces of the pipe by pressure welding is higher than the thickness of the ERW welded pipe, and the shape of this bead is related to the weld strength of the product. Therefore, it is usually removed by a bite immediately after ERW welding.

従って、電縫溶接部のビードを切削するときは、切削し過ぎによる肉厚不足や取り残しなど、切削が適正に行われているかを常時監視する必要がある。目視検査による場合は、造管後に製品長さに切断された後に、冷却床で鋼管内外面の形状を目視検査するのが一般的であるが、目視検査の場合は検査場が造管機から遠く離れており、目視検査にて造管の異常に気づいたときは、大量の不良品が発生しているという問題がある。   Therefore, when cutting the bead of the electric seam welded portion, it is necessary to constantly monitor whether the cutting is properly performed, such as lack of thickness due to excessive cutting or leaving behind. In the case of visual inspection, it is common to visually inspect the shape of the inner and outer surfaces of the steel pipe with a cooling bed after being cut into product length after pipe making. There is a problem that a large number of defective products are generated when it is far away, and when an abnormality in pipe making is noticed by visual inspection.

よって、目視がむつかしい電縫溶接管内面ビードの切削状況を常時監視するための方法が種々検討されている。従来の電縫溶接管ビード検出方法や装置に関する発明は、光学的方法、機械的方法や超音波による方法などが提案されている。   Therefore, various methods for constantly monitoring the cutting state of the inner surface bead of the ERW weld pipe, which is difficult to visually observe, have been studied. As for the conventional invention relating to the method and apparatus for detecting the welded pipe bead, an optical method, a mechanical method, an ultrasonic method, and the like have been proposed.

光学的方法としては、特許文献１には、管表面を撮像し、溶接部や母材部固有の信号波形特徴量を抽出して、予め記憶してある特徴量と符号させることでそれらを識別する方法が提案されている。   As an optical method, Japanese Patent Application Laid-Open No. H10-228667 identifies the image by picking up an image of the pipe surface, extracting signal waveform feature values unique to the welded part and the base metal part, and encoding them with feature values stored in advance. A method has been proposed.

機械的方法としては、特許文献２には、検出ローラを溶接線を中心にして内面ビード切削部を斜行させながらその高さ方向の位置を変化させることにより、内面ビードの切削形状を検出する方法が提案されている。   As a mechanical method, Patent Document 2 detects the cutting shape of the inner surface bead by changing the position in the height direction while skewing the inner surface bead cutting portion with the detection roller being centered on the weld line. A method has been proposed.

超音波による方法としては、特許文献３には、電縫管の外面側から超音波を溶接部に所定走査ピッチで送波し、溶接部の外面反射波及び内面反射波を受波する。タイマ回路は外面反射波の検出タイミングと内面反射波の検出タイミングの間の時間差を計測する。次いで、メモリ回路に記憶したデータに基づいて内面ビードの突出量を演算回路で演算する方法が提案されている。
特公平７−１１７４９５号公報 特許第２６８３０６６号公報 特開昭６１−２７３２７３号公報 As a method using ultrasonic waves, in Patent Document 3, ultrasonic waves are transmitted from the outer surface side of the ERW pipe to the welded portion at a predetermined scanning pitch, and the outer surface reflected wave and the inner surface reflected wave of the welded portion are received. The timer circuit measures the time difference between the detection timing of the external reflection wave and the detection timing of the internal reflection wave. Next, a method has been proposed in which the amount of protrusion of the inner bead is calculated by an arithmetic circuit based on the data stored in the memory circuit.
Japanese Examined Patent Publication No. 7-117495 Japanese Patent No. 2683066 JP-A 61-273273

しかしながら、特許文献１の光学的方法では、ビード部と母材部との輝度の違いを検出する方法であるが、ビード部の輝度は、溶接条件や管の肉厚に大きく依存するため、安定したビード部の検出がむつかしく、ビード部の輝度が低い場合は、ビード部が識別できないという問題がある。   However, the optical method of Patent Document 1 is a method for detecting a difference in luminance between the bead portion and the base material portion. However, the luminance of the bead portion greatly depends on the welding conditions and the wall thickness of the pipe, and thus is stable. If the bead portion is difficult to detect and the bead portion has low brightness, there is a problem that the bead portion cannot be identified.

特許文献２の機械的方法では、高温、多湿、スパッタおよび蒸気などの存在する環境では、駆動系を持つセンサは、コロの摩耗や機械の損傷が激しいという問題がある。   In the mechanical method of Patent Document 2, there is a problem that a sensor having a drive system is severely worn by a roller or mechanically damaged in an environment where high temperature, high humidity, spatter, and steam exist.

また、特許文献３の超音波による方法では、パイプの高温部を走行するため、超音波発信装置を保護するために冷却水をかける必要があり、溶接部を急冷してしまい溶接部の品質に影響を及ぼすこと、や探傷子のシューをパイプの外径単位に揃える必要があるという問題がある。   In addition, in the method using ultrasonic waves of Patent Document 3, it is necessary to pour cooling water in order to protect the ultrasonic transmission device in order to travel through the high temperature portion of the pipe. There is a problem that it is necessary to align the outer diameter unit of the pipe and the shoe of the probe.

本発明は、上記した従来技術の問題点を解決すべくなされたもので、図１に示す小型のレーザ発振装置や撮像装置を使用した機器配置により、計測技術としては、光切断法と動的モーメント演算を応用した画像処理手法により管内面の円周方向プロフィルと管内面ビード切削部表面の映像を同一モニター画面で確認できる電縫溶接管溶接部監視方法及び監視装置であり、更には、光学的手段によりモニター画面に表示された情報に基づき、切削条件や溶接条件を制御する電縫溶接管の製造方法である。   The present invention has been made to solve the above-mentioned problems of the prior art, and as a measurement technique, the optical cutting method and the dynamic method can be used as a measuring technique by the equipment arrangement using the small laser oscillation device and the imaging device shown in FIG. This is an electro-welded welded pipe monitoring method and monitoring device that can confirm the circumferential profile of the inner surface of the pipe and the image of the surface of the bead cutting part of the inner surface of the pipe on the same monitor screen using an image processing technique that applies moment calculation. This is a method for manufacturing an electric resistance welded pipe that controls cutting conditions and welding conditions based on information displayed on a monitor screen by a special means.

（１）第一の発明は、電縫溶接管の管内面溶接部表面にレーザを照射あるいは走査し、得られた反射光を撮像装置で撮像し、管内面の円周方向プロフィルと管内面ビード切削部表面の映像とを同一のモニター画面に表示することを特徴とする電縫溶接管溶接監視方法である。   (1) The first invention irradiates or scans the inner surface of the welded portion of the ERW welded tube with a laser, images the obtained reflected light with an imaging device, and the circumferential profile of the inner surface of the tube and the inner bead of the inner tube. An electric resistance welded pipe welding monitoring method characterized in that an image of a surface of a cutting part is displayed on the same monitor screen.

（２）第二の発明は、管内面の円周方向プロフィルと管内面ビード切削部表面の映像とに基づき、ビード切削バイトの押圧力、造管ロールの押しつけ力を制御することを特徴とする電縫溶接管の製造方法である。   (2) The second invention is characterized in that the pressing force of the bead cutting bite and the pressing force of the pipe making roll are controlled based on the circumferential profile of the pipe inner surface and the image of the surface of the bead cutting part of the pipe inner surface. It is a manufacturing method of an electric resistance welded pipe.

（３）第三の発明は、電縫溶接管ビード切削バイトのホルダーに取付けた、レーザ発振器とレーザ反射板とプリズムと撮像装置とを収納した光学検出手段と該光学検出手段内を測温し、冷却する温度調節手段と撮像装置で撮像した映像をモニター画面に表示するモニター手段とを備えたことを特徴とする電縫溶接管溶接監視装置。   (3) A third aspect of the invention is an optical detection means for housing a laser oscillator, a laser reflector, a prism, and an imaging device attached to a holder of an ERW weld bead cutting tool, and measuring the temperature in the optical detection means. An electro-welded pipe welding monitoring apparatus comprising: a temperature adjusting means for cooling; and a monitor means for displaying an image captured by the imaging device on a monitor screen.

ここに、管内面の円周方向プロフィルとは電縫溶接管の円周方向の管内表面の形状をいう。   Here, the circumferential profile of the inner surface of the pipe refers to the shape of the inner surface of the ERW weld pipe in the circumferential direction.

本発明により、オンラインで電縫管内面切削形状管理に要求される形状をモニタリングできるようになったので管内面切削条件、更には溶接条件の調整がリアルタイムに行えるようになった。   According to the present invention, it is possible to monitor the shape required for on-line cutting shape management of the ERW pipe on-line, so that the pipe inner surface cutting condition and further the welding condition can be adjusted in real time.

図１に本発明の装置構成を示す。対象とした母管はφ８８mmの小径電縫鋼管である。
レーザ発振器１は管内径に合わせてレーザ照射方向を変化できるように上下左右に回転可能となっている。レーザ光は、レーザ反射板２で反射されて、窓６を通過してビード部９に照射される。レーザ反射板２も反射したレーザ光がビード部９に正確に照射できるように回転可能となっている。 FIG. 1 shows an apparatus configuration of the present invention. The target mother pipe is a small diameter ERW steel pipe of φ88 mm.
The laser oscillator 1 can be rotated vertically and horizontally so that the laser irradiation direction can be changed according to the inner diameter of the tube. The laser beam is reflected by the laser reflecting plate 2, passes through the window 6, and is applied to the bead portion 9. The laser reflector 2 is also rotatable so that the reflected laser light can be accurately irradiated onto the bead portion 9.

窓６はレーザ光がビード部に照射されるようにケース５に開けた窓である。ビード部からの反射光はプリズム３で集光屈折して撮像装置４で受光される。撮像装置４としては、小型のCCDカメラ等が使用可能である。撮像装置４からの信号は切削バイトホルダー１０に取付けられたケーブルによりモニター装置に接続されている。   The window 6 is a window opened in the case 5 so that the bead portion is irradiated with the laser beam. The reflected light from the bead portion is condensed and refracted by the prism 3 and received by the imaging device 4. As the imaging device 4, a small CCD camera or the like can be used. A signal from the imaging device 4 is connected to the monitor device by a cable attached to the cutting tool holder 10.

上述した各装置はケース５に収納されて、切削バイトホルダー１０に固定されている。
ケース５は防塵、耐熱、耐久性があればよくＳＵＳ材等が使用される。またケース５内は１２０度以上の高温となり、センサー類を損傷する危険性があるので、熱伝対で測温し、内部温度が３０℃以上になる場合は、フッソ樹脂配管により液体窒素を流して、ケース５内を冷却できるようにしている。 Each device described above is housed in the case 5 and fixed to the cutting tool holder 10.
The case 5 may be made of SUS material or the like as long as it is dustproof, heat resistant and durable. In addition, since the temperature inside the case 5 is over 120 degrees, and there is a risk of damaging the sensors, if the temperature is measured with a thermocouple and the internal temperature exceeds 30 ° C, liquid nitrogen is allowed to flow through the fluorine resin piping. Thus, the inside of the case 5 can be cooled.

プリズム３の窓６に対向した面には保護ミラーを装着して、プリズムの損傷防止と防塵対策によりレーザ光の減衰防止を図っている。   A protective mirror is attached to the surface of the prism 3 facing the window 6 to prevent the laser beam from being attenuated by preventing damage to the prism and preventing dust.

図２はレーザ照射により電縫溶接管の管内面プロフィルを計測したもので、図２（ａ）は通常材でビード切削が適正に行われた例であり、管内面のプロフィルは円弧状を呈していることがわかる。図２（ｂ）は肉厚方向に深くビード部を切削した例で、プロフィルは円弧を２段重ねしたような形状となっている。図２（ｃ）は図２（ｂ）とは逆にビード部の切削が浅く、ビードが残存している例である。   Fig. 2 shows the inner surface profile of an ERW welded tube measured by laser irradiation. Fig. 2 (a) shows an example in which bead cutting is performed properly with a normal material, and the profile on the inner surface of the tube has an arc shape. You can see that FIG. 2B shows an example in which the bead portion is deeply cut in the thickness direction, and the profile has a shape in which two circular arcs are stacked. FIG. 2 (c) shows an example in which the bead portion is shallowly cut and the bead remains, contrary to FIG. 2 (b).

図３（ｂ）及び図３（ｄ）の画面は、レーザ照射による管内面プロフィルとカメラ映像による管内表面の切削状態を同一モニター画面に表示したものである。従来技術（図３（ａ）及び図３（ｃ）に示す画面）では、管内面プロフィルを表示した場合は、切削面の表面状態を示す映像は表示できなかったが、本発明によりカメラの絞りを最適化することにより図３（ｂ）及び図３（ｄ）に示すように、管内面プロフィルと管内表面の映像を同一モニター画面に表示できるようになった。   The screens of FIGS. 3B and 3D are obtained by displaying the tube inner surface profile by laser irradiation and the cutting state of the tube inner surface by a camera image on the same monitor screen. In the prior art (the screens shown in FIGS. 3 (a) and 3 (c)), when the pipe inner surface profile is displayed, an image showing the surface state of the cutting surface cannot be displayed. As shown in FIGS. 3B and 3D, the inner surface profile of the tube and the image of the inner surface of the tube can be displayed on the same monitor screen.

図３（ａ）及び図３（ｃ）に示す画面では、図２に示すような管内面形状（管内面プロフィル）の相違での認識は可能であるが、凹凸のない材料表面映像で認識すべき差異を見いだすことは不可能である。一方、図３（ｂ）及び図３（ｄ）では、画像の濃淡差で識別すべき差異を認識することができる。   In the screens shown in FIGS. 3A and 3C, it is possible to recognize the difference in the tube inner surface shape (tube inner surface profile) as shown in FIG. It is impossible to find a difference. On the other hand, in FIG. 3B and FIG. 3D, the difference to be identified can be recognized based on the difference in light and dark of the image.

これらを可能とした理由は、以下に述べる（１）、（２）による。
（１）ビード切削部のように、管表面が滑らかで鏡面に近い部分では、光の殆どは正反射し、撮影方向に反射する光量は少ない。一方、削り残り（スジ残り）発生部は、ほぼもとの粗い表面（未切削面）のままなので、反射光の指向性がもっと広がり、撮影方向にも相当量の光量が返ってくる。この光量の差より、ビード切削部と母材（未切削部）の区別、あるいは削り残り（スジ残り）の発生が識別できる。 The reason for making these possible is the following (1) and (2).
(1) In a portion where the tube surface is smooth and close to a mirror surface, such as a bead cutting portion, most of the light is regularly reflected, and the amount of light reflected in the photographing direction is small. On the other hand, the uncut portion (streaks remaining) generation portion remains almost the original rough surface (uncut surface), so that the directivity of the reflected light is further spread and a considerable amount of light returns in the photographing direction. From this difference in the amount of light, it is possible to distinguish between a bead cutting portion and a base material (uncut portion) or occurrence of uncut portions (streaks remaining).

（２）モニター画面上のスリット光以外の領域を明るめに撮影することで、スジ残りの有無が識別できる。これらを得るため適正なカメラ設定（レンズ選択、絞り設定など）で可能となった。   (2) The presence or absence of streaks can be identified by capturing a bright area in the monitor screen other than the slit light. In order to obtain these, it was possible with appropriate camera settings (lens selection, aperture setting, etc.).

図３（ｂ）の画面は切削位置とビード軸がずれたために正常な円弧が得られず肩張り部と未切削部が残存している。図３（ｄ）の画面は管内面のプロフィルは円弧に近い形状が得られたが、未切削部がスジ残りとして残存している。「スジ残り」とは、チッピングともよばれる切削欠陥で、切削バイトの刃先が適正でなく、未切削部が残存し、それがスジ状に見えるものである。この欠陥は、管内面プロフィルでは検出できない欠陥である。   In the screen of FIG. 3 (b), since the cutting position and the bead axis are shifted, a normal arc cannot be obtained, and the shoulder portion and the uncut portion remain. In the screen of FIG. 3D, the profile of the inner surface of the tube has a shape close to a circular arc, but the uncut portion remains as a streak remaining. The “streaks remaining” is a cutting defect called chipping, in which the cutting edge of the cutting tool is not appropriate, an uncut portion remains, and it looks like a streak. This defect cannot be detected by the tube inner surface profile.

従って、図３（ｂ）や図３（ｄ）に示すように管内面プロフィルとカメラ映像を同一モニター画面に表示することによって電縫溶接管を製造する際の管内面形状管理項目である「深削り」、「片削り」、「ビード残り」、「スジ残り」を一つのモニター画面で管理できるので欠陥や異常を生じた場合の上工程（ビード切削工程、溶接工程）へのフィードバックが迅速になされるようになった。   Therefore, as shown in FIG. 3B and FIG. 3D, the pipe inner surface profile and the camera image are displayed on the same monitor screen, and “depth” is an item for managing the inner surface of the pipe when manufacturing an electric resistance welded pipe. “Shaving”, “Striping”, “Bead remaining”, “Leave streaks” can be managed on one monitor screen, so feedback to the upper process (bead cutting process, welding process) when a defect or abnormality occurs is quick Came to be made.

ここに「深削り」とは切削バイトの押しつけ力が強すぎてビード部が規定切削量よりも深く切削された切削欠陥をいう。このことは、電縫溶接管の肉厚が局部的に薄くなっていることを意味するので切削バイトの押しつけ力を調整する必要がある。   Here, “deep cutting” refers to a cutting defect in which the pressing force of the cutting tool is too strong and the bead portion is cut deeper than the specified cutting amount. This means that the thickness of the ERW welded pipe is locally reduced, so that the pressing force of the cutting tool needs to be adjusted.

「片削り」とはビード幅全体が切削されずに片側のみ削った状態の切削欠陥である。この欠陥が発生すると切削バイトの管軸に対する方向性、設定位置の修正を行なったり、切削バイトだけでは修正できない場合は、溶接工程での管の捻れ等の修正も必要になる。   The “single cut” is a cutting defect in which the entire bead width is not cut and only one side is cut. When this defect occurs, the directionality and setting position of the cutting bit with respect to the tube axis are corrected, or when the cutting bit alone cannot be corrected, it is also necessary to correct the twist of the tube in the welding process.

「ビード残り」とは切削バイトの当たりが弱く切削深さが浅くビードの山部が取り切れていない切削欠陥をいう。「スジ残り」は上述した通りである。   The “bead residue” means a cutting defect in which the cutting bite is weak, the cutting depth is shallow, and the crest of the bead is not removed. The “streaks remaining” is as described above.

発生した上述した欠陥が発生した場合は、切削バイトの調整、ロールの調整などによりビード切削の修正をおこなう。   When the generated defect occurs, the bead cutting is corrected by adjusting the cutting tool, adjusting the roll, or the like.

図４にその一例を示す。図４（ａ）は、造管した電縫溶接管がローリングしたため、内面ビードの位置と内面切削バイトの位置がずれて、ビード切削に片削りが発生した場合のモニター画面である。   An example is shown in FIG. FIG. 4A is a monitor screen in the case where the position of the inner surface bead is shifted from the position of the inner surface cutting bite due to the rolling of the electroformed welded pipe, and the one side of the bead cutting occurs.

このような場合は、電縫溶接管造管用ロールの押しつけ力やロール位置を調整して、ローリングを解消させて、内面ビードの位置と内面切削バイトの位置を合致させると図４（ｂ）に示すモニター画面が得られる。このように、管内面プロフィルとカメラ映像による管内表面の切削状態を同一のモニター画面に表示できるようにしたので、ビード切削欠陥の原因をオンラインで短時間に判断できるので、造管方法の調整が迅速におこなえる。   In such a case, adjusting the pressing force and roll position of the ERW welded pipe making roll to eliminate rolling, and to match the position of the inner surface bead and the position of the inner surface cutting tool, FIG. The monitor screen shown is obtained. In this way, the cutting state of the pipe inner surface by the pipe inner surface profile and the camera image can be displayed on the same monitor screen, so the cause of the bead cutting defect can be judged online in a short time, so the pipe making method can be adjusted. It can be done quickly.

本発明により、外部から目視が出来ない製品内部の状況を確認する必要がある分野に適用することができる。   INDUSTRIAL APPLICABILITY According to the present invention, the present invention can be applied to a field where it is necessary to confirm a situation inside a product that cannot be visually observed from the outside.

本発明の装置構成を説明する図である。It is a figure explaining the apparatus structure of this invention. 管内面プロフィルの計測結果を説明する図である。It is a figure explaining the measurement result of a pipe inner surface profile. 管内面プロフィルと管内表面の切削状態を説明する図である。It is a figure explaining the cutting state of a pipe inner surface profile and a pipe inner surface. 造管方法の調整例を説明する図面である。It is drawing explaining the adjustment example of a pipe making method.

符号の説明Explanation of symbols

１ レーザ発振器
２ レーザ反射板
３ プリズム
４ 撮像装置
５ ケース
６ 窓
７ 電縫管
８ 切削バイト
９ ビード部
１０ 切削バイトホルダー
１１ 切削ビード DESCRIPTION OF SYMBOLS 1 Laser oscillator 2 Laser reflector 3 Prism 4 Imaging device 5 Case 6 Window 7 Electric sewing tube 8 Cutting tool 9 Bead part 10 Cutting tool holder 11 Cutting bead

Claims (3)

電縫溶接管の管内面溶接部表面にレーザを照射あるいは走査し、得られた反射光を撮像装置で撮像し、管内面の円周方向プロフィルと管内面ビード切削部表面の映像とを同一のモニター画面に表示することを特徴とする電縫溶接管溶接部監視方法。   Laser irradiation or scanning is performed on the inner surface of the welded surface of the ERW welded tube, and the reflected light obtained is imaged by an imaging device, and the circumferential profile of the inner surface of the tube and the image of the surface of the beaded portion of the inner surface of the tube are identical. A method for monitoring a welded part of an electric resistance welded pipe, wherein the welded part is displayed on a monitor screen. 前記管内面の円周方向プロフィルと管内面ビード切削部表面の映像とに基づき、ビード切削バイトの押圧力、造管ロールの押しつけ力を制御することを特徴とする電縫溶接管の製造方法。   A method for manufacturing an electro-welded welded pipe, comprising: controlling a pressing force of a bead cutting bite and a pressing force of a pipe making roll based on a circumferential profile of the pipe inner surface and an image of a bead cutting part surface of the pipe inner surface. 電縫溶接管ビード切削バイトのホルダーに取付けた、レーザ発振器とレーザ反射板とプリズムと撮像装置とを収納した光学検出手段と該光学検出手段内を測温し、冷却する温度調節手段と撮像装置で撮像した映像をモニター画面に表示するモニター手段とを備えたことを特徴とする電縫溶接管溶接部監視装置。   An optical detection means for housing a laser oscillator, a laser reflector, a prism, and an image pickup device, and a temperature adjusting means for measuring and cooling the inside of the optical detection means and an image pickup device, which are attached to a holder of an ERW weld bead cutting tool And a monitoring means for displaying on the monitor screen the image picked up in (1).
JP2007007201A 2007-01-16 2007-01-16 Method and device for monitoring welded part of electro-resistance-welded pipe and manufacturing method of electro-resistance-welded pipe Pending JP2008175577A (en)

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