JPH03234444A - Monitoring device for bead cutting state of electric resistance welded pipe inner face - Google Patents
Monitoring device for bead cutting state of electric resistance welded pipe inner faceInfo
- Publication number
- JPH03234444A JPH03234444A JP3053990A JP3053990A JPH03234444A JP H03234444 A JPH03234444 A JP H03234444A JP 3053990 A JP3053990 A JP 3053990A JP 3053990 A JP3053990 A JP 3053990A JP H03234444 A JPH03234444 A JP H03234444A
- Authority
- JP
- Japan
- Prior art keywords
- window
- bead
- electric resistance
- inner face
- resistance welded
- 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.)
- Pending
Links
- 239000011324 bead Substances 0.000 title claims abstract description 50
- 238000005520 cutting process Methods 0.000 title claims abstract description 26
- 238000012806 monitoring device Methods 0.000 title claims description 7
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 238000010926 purge Methods 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011521 glass Substances 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- -1 steam Substances 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Machine Tool Sensing Apparatuses (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、電縫管、特に電縫管製造時における内面ビー
ドの切削状況を監視する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for monitoring the cutting status of an inner bead during the manufacture of an electric resistance welded tube, particularly an electric resistance welded tube.
［従来の技術］
電縫管の内面ビードが適切に削除されているか否か、そ
の切削形状の測定は切削直後にラインを止めてガス切断
などによりサンプル採取をして行うか、所定寸法に切断
された製品で行うかの何れかによる場合には、前者にお
いてはライン停止による実働率、歩留まりの低下を招き
、後者は測定結果の情報を得るまでに大量の切削不良材
を発生させることになる。このため、オンラインで電縫
管の内面ビード切削形状を測定出来る技術が必要となる
。[Prior art] To determine whether the inner bead of an ERW pipe has been properly removed or not, the cut shape can be measured by stopping the line immediately after cutting and collecting a sample using gas cutting, or by cutting it to a predetermined size. In either case, the former will lead to line stoppages that will lower the actual working rate and yield, and the latter will result in a large amount of defective material being cut before information on the measurement results is obtained. . Therefore, a technology that can measure the cut shape of the inner bead of an ERW tube online is required.
このような要求に沿うべく開発された電縫管の内面ビー
ド監視技術としては、特開昭５７１３７０２７号公報に
この種の技術が紹介されている。該公報に記載された技
術は第５図に示すように、電縫管１はスクイズロール３
０を通過するときに電縫溶接される。電縫管の電縫溶接
部に盛り上がった内面ビードはカッター１５で切削され
る。電縫管１の下流側〈矢印方向）にケーシング３１が
配設され、ケーシング３１内にはレーザー光発生器〈図
示せず）からのスポット光をスリット光３に変換するシ
リンドリカルレンズ３２を配設し、これより発せられた
光はミラー３３．３４により反射され、開口部３５を通
して電縫管１の内面ビード部２に照射される。照射光に
よって形成された光切断プロフィルは鏡３６によって反
射され、ＴＶカメラ３７によって受像される。３８はレ
ーザー光発生器からのスポット光をシリンドリカルレン
ズ３２に導くための光ファイバーであり、３９はＴＶカ
メラからの信号を取り出すためのケーブルである。As a technology for monitoring the inner surface bead of an electric resistance welded pipe developed to meet such requirements, this type of technology is introduced in Japanese Patent Application Laid-Open No. 57137027. The technique described in the publication is as shown in FIG.
When passing through 0, electric resistance welding is performed. A cutter 15 cuts off the raised inner bead at the electric resistance welded portion of the electric resistance welded pipe. A casing 31 is disposed on the downstream side (in the direction of the arrow) of the electric resistance welded pipe 1, and a cylindrical lens 32 is disposed within the casing 31 for converting a spot light from a laser light generator (not shown) into a slit light 3. However, the light emitted from this is reflected by the mirrors 33 and 34, and is irradiated onto the inner bead portion 2 of the electric resistance welded tube 1 through the opening 35. The light cutting profile formed by the irradiated light is reflected by the mirror 36 and imaged by the TV camera 37. 38 is an optical fiber for guiding the spot light from the laser light generator to the cylindrical lens 32, and 39 is a cable for taking out the signal from the TV camera.
［発明が解決しようとする課題］
しかしながら、上述の従来技術においては下記の問題点
がある。すなわち、
（１）製造中の電縫管の内部には、水、蒸気、粉塵が存
在するので、長時間の監視は困難である。[Problems to be Solved by the Invention] However, the above-mentioned prior art has the following problems. That is, (1) Water, steam, and dust are present inside the ERW pipe during manufacture, so long-term monitoring is difficult.
（２Ｊレ一ザー光発生器からのスポット光をシリンドリ
カルレンズに導くために光ファイバーを使用しているの
で、伝搬途中で光が減衰する。このため、十分な光量を
得るためには強力なレーザー光源を使用しなければなら
ない、また、光ファイバーは高価であり、現地における
装置着脱作業も困難である。(Since an optical fiber is used to guide the spot light from the 2J laser light generator to the cylindrical lens, the light is attenuated during propagation. Therefore, in order to obtain a sufficient amount of light, a powerful laser light source is required. In addition, optical fiber is expensive, and it is difficult to attach and detach the equipment on-site.
０）シリンドリカルレンズとＴＶカメラを縦に重ねた構
造としているため、装置の寸法が大きくなる。このため
、この装置が適用可能となるのは大きな外径の電縫管に
限定される。0) Since the cylindrical lens and TV camera are stacked vertically, the size of the device becomes large. For this reason, this device is only applicable to electric resistance welded tubes with large outer diameters.
４４１反射鏡の数が多く、構成が複雑であるため、調整
が困難である。Since the number of 441 reflecting mirrors is large and the configuration is complicated, adjustment is difficult.
（四磁気シールドが不十分で、電気回路にノイズが発生
する。(4) Insufficient magnetic shielding causes noise in the electrical circuit.
本発明は上記の問題点を解決し、装置寸法の小さい、測
定雰囲気の影響を受けない、操作性、信頼性の良い電縫
管内面ビード切削状況監視装置を提供することをその目
的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an apparatus for monitoring the cutting status of an inner bead of an electric resistance welded tube, which is small in size, unaffected by the measurement atmosphere, and has good operability and reliability. It is.
［課題を解決するための手段］
上記目的を達成するために、本発明に係る電縫管内面ビ
ード切削状況監視装置においては、電縫管内面ビード切
削状況監視用機器を並べて内蔵する筺体に、電縫管内面
ビード部への投射光及び前記電縫管内面ビード部からの
反射光が透過する窓が設けられたものである。[Means for Solving the Problems] In order to achieve the above object, in the ERW pipe inner bead cutting status monitoring device according to the present invention, a casing in which equipment for monitoring the ERW pipe inner bead cutting status is arranged and built in, A window is provided through which light projected onto the inner bead portion of the electric resistance welded tube and light reflected from the inner bead portion of the electric resistance welded tube are transmitted.
また、前記窓の外側を摺動して清掃するするワイパーを
備え、さらに前記窓の外側周囲にエアパージノズルを備
えたもので、スリット光が減光されるのを防止できるも
のである。Further, it is equipped with a wiper that slides and cleans the outside of the window, and is further equipped with an air purge nozzle around the outside of the window, which can prevent the slit light from being dimmed.
また、前記筺体に接続する信号線を保護管で覆ったので
、電縫管内面ビード切削状況監視装置がノイズによって
外乱されない。Further, since the signal line connected to the housing is covered with a protective tube, the electric resistance welded tube inner bead cutting status monitoring device is not disturbed by noise.
［作用］
上記のように構成された本発明における電縫管内面ビー
ド切削状況監視装置は、
電縫管内面ビード切削状況監視用機器を並べて内蔵する
筺体に、製造中の電縫管の内部に存在する水、蒸気、粉
塵が侵入せず、長時間の監視が可能である。[Function] The device for monitoring the cutting status of the inner bead of an ERW pipe according to the present invention configured as described above includes a case in which equipment for monitoring the cutting status of the inner bead of the ERW pipe is arranged and installed inside the ERW pipe being manufactured. Existing water, steam, and dust do not enter and long-term monitoring is possible.
また、電縫管内面ビード部への投射光、前記電縫管内面
ビード部からの反射光が伝搬途中で減衰してしまうこと
がなく１強力なレーザー光源を必要とすることもないの
で装置をコンパクトなものにできる。In addition, the light projected onto the inner bead of the ERW tube and the light reflected from the inner bead of the ERW tube are not attenuated during propagation, and a powerful laser light source is not required. It can be made compact.
また、前記窓の外側を摺動して清掃するするワイパーを
備え、さらに前記窓の外側周囲にエアパージノズルを備
えたので、窓の外側の汚染の防止、及び汚染した場合そ
の汚れを直ちに除去でき、長時間の監視が可能である。In addition, it is equipped with a wiper that slides and cleans the outside of the window, and is further equipped with an air purge nozzle around the outside of the window, so that it is possible to prevent the outside of the window from being contaminated and to immediately remove the dirt if it becomes contaminated. , long-term monitoring is possible.
また、前記筺体に接続する信号線を保護管で覆ったので
、前記電縫管内面ビード切削状況監視装置の電気回路に
ノイズが発生することもない。Further, since the signal line connected to the housing is covered with a protective tube, noise is not generated in the electric circuit of the electric resistance welded tube inner bead cutting status monitoring device.
［実施例］ 以下、本発明の実施例を図面により説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図は本発明の構成を示す概念図で、電縫
管１の切削後の内面ビード部２の形状は内面ビード部２
に斜めの方向からスリット光３を投射して、内面ビード
部２の断面形状を表す米切断プロフィル４として得られ
る。スリット光３はスリット光発光装置４から発射され
、鏡５で進路変更されて、内面ビード部２へ斜めに投射
される。内面ビード部２で反射されて戻ってくるスリッ
ト光３は鏡６で進路変更してＣＣＤカメラ７で受光する
。これら電縫管内面ビード切削状況監視用機器用スリッ
ト光発光装置４、鏡５，６及びＣＣＤカメラ７は、筺体
８に格納されている。そして、筺体８は密封容器で、内
蔵する機器類の汚染を防止するものであり、スリット光
３が通過する窓９が設けられている。ＣＣＤカメラ７で
受像した情報は、ケーブル１０を経て制御器１１に送ら
れ信号処理されて、モニターＴＶ１２上に内面ビードの
断面形状として写し出すようにしている。また、この信
号をコビャー１３によってハードコピーすることも可能
である。なお、スリット光発光装置４は、半導体レーザ
ー発光装置よりのレーザー光をコリメータレンズ及びシ
リンドリカルレンズでスリット光３にしている。1 and 2 are conceptual diagrams showing the structure of the present invention, and the shape of the inner bead portion 2 after cutting the electric resistance welded tube 1 is
A slit light beam 3 is projected from an oblique direction onto the surface of the inner bead portion 2 to obtain a rice cutting profile 4 representing the cross-sectional shape of the inner bead portion 2. The slit light 3 is emitted from the slit light emitting device 4, changed course by the mirror 5, and projected obliquely onto the inner bead portion 2. The slit light 3 reflected by the inner bead portion 2 and returned is changed course by a mirror 6 and received by a CCD camera 7. These slit light emitting device 4, mirrors 5, 6, and CCD camera 7 are housed in a housing 8. The housing 8 is a sealed container to prevent contamination of the built-in equipment, and is provided with a window 9 through which the slit light 3 passes. The information received by the CCD camera 7 is sent to the controller 11 via the cable 10, where it undergoes signal processing and is displayed on the monitor TV 12 as a cross-sectional shape of the inner bead. It is also possible to make a hard copy of this signal using the cobyer 13. Note that the slit light emitting device 4 converts laser light from a semiconductor laser light emitting device into slit light 3 using a collimator lens and a cylindrical lens.
なお、スリット光３は管体を横断する方向に投射し、内
面ビード部２の光切断プロフィル１４が内面ビードの横
断面形状を出現させるようにする。さらに、筺体８はそ
の一端側を内面ビードカッター１５の端部に連結されて
いる。Note that the slit light 3 is projected in a direction across the tube so that the light cutting profile 14 of the inner bead portion 2 appears in the cross-sectional shape of the inner bead. Further, the housing 8 has one end connected to an end of the inner bead cutter 15.
第３図（ａ）、（ｂ）は本発明の一実施例を示す上面図
、及び側面図である。筺体８の内部には電縫管内面ビー
ド切削状況監視用機器用スリット光発光装置Ｆ４．鏡５
及び６、ＣＣＤカメラ７が配されており、筺体８の上表
面にはスリット光３が透過する耐熱ガラス製の！Ｅ９が
配されている。窓９の外面は空気圧シリンダー１６によ
って駆動されるワイパー１７によって清掃される。さら
に、窓９の外面外周部にはエアパージノズル１８が配さ
れ、空気配管１９より低圧空気がエアパージノズル１８
に搬送され、エアパージノズル１８よりの空気の噴出に
よって、水、蒸気、粉塵が窓９に付着するのを防止して
いる。また、窓９にはヒーター２０が装着されて、窓９
の曇りを防止している。筺体８の内部にも空気配管２０
によって、低圧空気が噴出され、筺体８内の装置を冷却
し、空気吹出口２２から排出される。スリット光発光装
置４、ＣＣＤカメラ７に電力を供給するケーブル１０は
銅管２３によってシールされており、外部電磁場による
ノイズの発生を防止している０本装置において内面ビー
ド像の解像度は０．０５ｍｍで、カメラの視野は２０關
Ｘ２０關である。FIGS. 3(a) and 3(b) are a top view and a side view showing one embodiment of the present invention. Inside the housing 8 is a slit light emitting device F4 for monitoring the cutting status of the inner bead of the ERW tube. Mirror 5
and 6, a CCD camera 7 is arranged, and the upper surface of the housing 8 is made of heat-resistant glass through which the slit light 3 passes! E9 is placed. The outer surface of the window 9 is cleaned by a wiper 17 driven by a pneumatic cylinder 16. Further, an air purge nozzle 18 is disposed on the outer periphery of the window 9, and low pressure air is supplied from the air pipe 19 to the air purge nozzle 18.
The water, steam, and dust are prevented from adhering to the window 9 by blowing out air from the air purge nozzle 18. Further, a heater 20 is attached to the window 9, and the window 9
prevents fogging. There is also air piping 20 inside the housing 8.
As a result, low-pressure air is blown out, cools the device inside the housing 8, and is discharged from the air outlet 22. The cable 10 that supplies power to the slit light emitting device 4 and the CCD camera 7 is sealed with a copper tube 23 to prevent the generation of noise due to external electromagnetic fields.In this device, the resolution of the inner bead image is 0.05 mm. The field of view of the camera is 20 degrees x 20 degrees.
第４図はオンライン測定結果で、電縫管の内面ビード部
断面図とそのオッシログラフ図である。FIG. 4 shows the online measurement results, which are a sectional view of the inner bead portion of the electric resistance welded tube and an oscillographic diagram thereof.
電縫管の内面ビード部断面図である第４図（ａ）〜（ｃ
）は、それぞれオッシログラフ図である第４図（ｄ）〜
（ｆ）に対応する。第４図（ａ）は内面ビードを切削し
ない場合であり、第４図（ｂ）及び（ｃ）はそれぞれ内
面ビード高さが０．１ｍｍの場合、及び内面ビードが所
定形状に切削された場合を示すが、何れの場合もオッシ
ログラフ図のパターンはこれらの電縫管の内面ビード部
断面図に良く対応している。FIGS. 4(a) to 4(c) are cross-sectional views of the inner bead portion of the ERW pipe.
) are oscillographic diagrams in Figures 4(d) to 4(d), respectively.
Corresponds to (f). Figure 4(a) shows the case where the inner bead is not cut, and Figures 4(b) and (c) show the case where the inner bead height is 0.1 mm and the inner bead is cut into a predetermined shape, respectively. However, in both cases, the patterns of the oscillographic diagrams correspond well to the cross-sectional views of the inner bead portions of these electric resistance welded tubes.
［発明の効果］
以上のように、本発明によれば、電縫管製造時の内面ビ
ードの常時監視が可能となり、電縫管製造における実働
率、歩留まりが向上し、切削不良材が低減する等優れた
効果がある。[Effects of the Invention] As described above, according to the present invention, it is possible to constantly monitor the inner bead during the manufacture of ERW pipes, the actual work rate and yield in the manufacture of ERW pipes are improved, and the number of defective cutting materials is reduced. It has excellent effects.
第１図及び第２図は本発明の構成を示す概念図、第３図
（ａ）、（ｂ）は本発明の一実施例を示す上面図、及び
側面図、第４図（ａ）〜（ｆ）はオンライン測定結果を
示し、電縫管の内面ビード部断面図及びオッシログラフ
図、第５ｒｙｉは従来技術の説明図である。
１・・・電縫管、２・・・内面ビード部、３・・・スリ
ット光、４・・・スリット光発光装置、５．６・・・鐘
、７・・・ＣＣＤカメラ、８・・・筺体、９・・・窓、
１０・・・ケーブル、１１・・・制御器、１２・・・モ
ニターＴＶ、１３・・・コビャー、１４・・・光切断プ
ロフィル、１５・・・内面ビードカッター、１６・・・
空気圧シリンダー１７・・・ワイパー、１８・・・エア
パージノズル、１９・・・空気配管、２０・・・ヒータ
ー、２１・・・空気配管、２２・・・空気吹出口、２３
・・・鋼管。1 and 2 are conceptual diagrams showing the configuration of the present invention, FIGS. 3(a) and 3(b) are top views and side views showing one embodiment of the present invention, and FIGS. 4(a) to 4 are (f) shows the online measurement results, a sectional view and an oscillographic diagram of the inner bead portion of the electric resistance welded tube, and the fifth ryi is an explanatory diagram of the prior art. DESCRIPTION OF SYMBOLS 1... ERW tube, 2... Inner bead part, 3... Slit light, 4... Slit light emitting device, 5.6... Bell, 7... CCD camera, 8...・Housing, 9...window,
DESCRIPTION OF SYMBOLS 10... Cable, 11... Controller, 12... Monitor TV, 13... Cobyer, 14... Optical cutting profile, 15... Inner bead cutter, 16...
Pneumatic cylinder 17... Wiper, 18... Air purge nozzle, 19... Air piping, 20... Heater, 21... Air piping, 22... Air outlet, 23
...Steel pipe.
Claims (4)
蔵する筺体に、電縫管内面ビード部への投射光及び前記
電縫管内面ビード部からの反射光が透過する窓を設けた
ことを特徴とする電縫管内面ビード切削状況監視装置。(1) A window is provided in the housing housing the equipment for monitoring the cutting status of the inner bead of the ERW tube through which light projected onto the inner bead of the ERW tube and light reflected from the bead of the ERW tube are transmitted. A device for monitoring the cutting status of the inner bead of an ERW tube.
特徴とする請求項１記載の電縫管内面ビード切削状況監
視装置。(2) The electric resistance welded tube inner surface bead cutting status monitoring device according to claim 1, further comprising a wiper that slides on the outside of the window.
とを特徴とする請求項１又は２記載の電縫管内面ビード
切削状況監視装置。(3) The electric resistance welded tube inner surface bead cutting status monitoring device according to claim 1 or 2, further comprising an air purge nozzle around the outside of the window.
を特徴とする請求項１又は２又は３記載の電縫管内面ビ
ード切削状況監視装置。(4) The electric resistance welded tube inner surface bead cutting status monitoring device according to claim 1, 2 or 3, wherein the signal line connected to the housing is covered with a protective tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3053990A JPH03234444A (en) | 1990-02-09 | 1990-02-09 | Monitoring device for bead cutting state of electric resistance welded pipe inner face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3053990A JPH03234444A (en) | 1990-02-09 | 1990-02-09 | Monitoring device for bead cutting state of electric resistance welded pipe inner face |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03234444A true JPH03234444A (en) | 1991-10-18 |
Family
ID=12306601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3053990A Pending JPH03234444A (en) | 1990-02-09 | 1990-02-09 | Monitoring device for bead cutting state of electric resistance welded pipe inner face |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03234444A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005044503A1 (en) * | 2003-11-05 | 2005-05-19 | Ses-Entwicklung Gmbh | Method for monitoring weld seams during a welding process and device for carrying out said method |
| JP2005224823A (en) * | 2004-02-10 | 2005-08-25 | Sumiden Asahi Industries Ltd | Monitoring device for bead trimmer |
| US7236255B2 (en) * | 2002-04-30 | 2007-06-26 | Jfe Steel Corporation | Method and instrument for measuring bead cutting shape of electric welded tube |
| KR100780310B1 (en) * | 2007-03-14 | 2007-11-28 | 대교엔지니어링(주) | Liquid metal observing device of a vacuum tank |
-
1990
- 1990-02-09 JP JP3053990A patent/JPH03234444A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7236255B2 (en) * | 2002-04-30 | 2007-06-26 | Jfe Steel Corporation | Method and instrument for measuring bead cutting shape of electric welded tube |
| US7471400B2 (en) * | 2002-04-30 | 2008-12-30 | Jfe Steel Corporation | Measurement method and device for bead cutting shape in electric resistance welded pipes |
| US7619750B2 (en) * | 2002-04-30 | 2009-11-17 | Jfe Steel Corporation | Measurement method and device for bead cutting shape in electric resistance welded pipes |
| WO2005044503A1 (en) * | 2003-11-05 | 2005-05-19 | Ses-Entwicklung Gmbh | Method for monitoring weld seams during a welding process and device for carrying out said method |
| JP2005224823A (en) * | 2004-02-10 | 2005-08-25 | Sumiden Asahi Industries Ltd | Monitoring device for bead trimmer |
| KR100780310B1 (en) * | 2007-03-14 | 2007-11-28 | 대교엔지니어링(주) | Liquid metal observing device of a vacuum tank |
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