JPH0250835B2 - - Google Patents
Info
- Publication number
- JPH0250835B2 JPH0250835B2 JP57087270A JP8727082A JPH0250835B2 JP H0250835 B2 JPH0250835 B2 JP H0250835B2 JP 57087270 A JP57087270 A JP 57087270A JP 8727082 A JP8727082 A JP 8727082A JP H0250835 B2 JPH0250835 B2 JP H0250835B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- scale
- pressure water
- pressure
- tube
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Description
【発明の詳細な説明】
本発明は熱延コイルを酸洗しないで黒皮のまま
使用（以下この材料を黒皮材と称する）する電縫
管ミルの電縫溶接装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric resistance welding device for an electric resistance welding tube mill that uses hot-rolled coils without pickling and using the black skin (hereinafter, this material is referred to as black skin material).
黒皮材は酸洗工程が無いため素材費が安く、ま
た約６mm以上の厚肉材は酸洗不可のため殆んどの
電縫管ミルでは黒皮材を素材として使用してい
る。しかし、黒皮材を使用した場合は、酸洗材を
使用した場合に比較してスポツト状の溶接欠陥
（以下スポツト欠陥と称す）が発生し易い。この
原因は調査の結果、成形途中で剥離したスケール
がスケルプエツジ部、ワークコイル、及びインピ
ーダ上に堆積し、何らかの原因で溶接部に夾雑す
るためである。このため従来法では、第１図に示
すように、管状スケルプ１を管２に造管する際に
インピーダ５の上を洗浄するインピーダ洗浄ノズ
ル１０、ワークコイル３を洗浄するワークコイル
洗浄ノズル９または溶接点６とスケルプエツジ７
をブローするＶ点ブロー８を組合わせて10Kg／cm2
未満の圧力の水又はエアを用いて洗浄後、溶接ロ
ール４により加圧溶接を行なつていた。また第６
図は従来法におけるワークコイルの代わりにコン
タクトチツプを用いた場合の図であり、符号２０
はコンタクトチツプである。しかしながらこれら
の方法では、余り強くブローすると管状スケル
プ１および管２内にたまつているスケールを含む
水溶性フオーミング油の乱れを生じる。小径サ
イズではスケールの堆積し易いインピーダ５とス
ケルプエツジ７の距離が小さくなる。スケール
を含む管２内のフオーミング油が溶接熱のため沸
騰し溶接点６側に逆流する等の現象があり、スケ
ールを溶接部に噛込み易く、スポツト欠陥の発生
を防止することは不可能であつた。現状のNDI
はスポツト欠陥の検出精度が悪く、スポツト欠陥
を検出し、リジエクトするためには極めて能率の
悪い条件で検査する必要があり、万一見逃した場
合は重大欠陥となり需要家に多大の損害を与える
ことになる。 Since black bark material does not require a pickling process, the material cost is low, and thick-walled materials of approximately 6 mm or more cannot be pickled, so most ERW tube mills use black bark material as a material. However, when a black skin material is used, spot-like welding defects (hereinafter referred to as spot defects) are more likely to occur than when a pickled material is used. As a result of investigation, the cause of this is that scale that has peeled off during molding is deposited on the scalp edge, work coil, and impeder, and for some reason contaminates the welded part. For this reason, in the conventional method, as shown in FIG. Weld point 6 and scalp edge 7
10Kg/cm 2 in combination with V point blow 8
After cleaning using water or air at a pressure lower than that of the welding roll 4, pressure welding was performed using the welding roll 4. Also the 6th
The figure shows a case where a contact tip is used instead of the work coil in the conventional method, and the number 20 is
is a contact chip. However, in these methods, if the blowing is performed too strongly, the scale-containing water-soluble forming oil accumulated in the tubular skelp 1 and the tube 2 will be disturbed. With a small diameter size, the distance between the impeder 5 and the scale edge 7, where scale tends to accumulate, becomes smaller. There are phenomena such as the forming oil in the pipe 2 containing scale boiling due to welding heat and flowing back to the welding point 6 side, making it easy for scale to get caught in the welding part and making it impossible to prevent the occurrence of spot defects. It was hot. Current NDI
The detection accuracy of spot defects is poor, and in order to detect and reject spot defects, it is necessary to perform inspection under extremely inefficient conditions, and if a spot defect is missed, it will become a serious defect and cause great damage to the customer. become.
この発明は上記のように従来法では発生の防止
が不可能であつた黒皮材のスポツト欠陥をほぼ完
全に防止可能な電縫管の溶接装置を提供するもの
である。すなわちこの発明の電縫管溶接装置は、
熱延コイルを酸洗しない黒皮のままのスケルプを
素材とする電縫管ミルにおいて、フインパスロー
ルとワークコイルまたは、コンタクトチツプ間の
位置で、管条スケルプの外側に外面高圧水ノズル
と内面側には、導入管を介して内面高圧ノズルと
を設け、内面側にはさらに前記内面高圧ノズルか
ら噴射された水または水溶液をスケルプエツジ部
に導く内面せきを設けて、前記外面高圧水ノズル
と前記内面高圧ノズルとからフインパスロール方
向に向けて10Kg／cm2以上の高圧液を吹きつけてス
ケールを除去することを特徴とする黒皮材の電縫
管溶接装置である。 The present invention provides a welding device for electric resistance welded pipes which can almost completely prevent spot defects in black skin material, which cannot be prevented by conventional methods, as described above. That is, the electric resistance welding pipe welding device of this invention is
In an electric resistance welding tube mill in which hot-rolled coils are made from unpickled skelp, an outer high-pressure water nozzle and an inner surface are installed on the outside of the tube skelp at a position between the fin pass roll and the work coil or contact tip. An inner high-pressure nozzle is provided on the side via an inlet pipe, and an inner weir is further provided on the inner side to guide water or aqueous solution injected from the inner high-pressure nozzle to the squelp edge part, so that the outer high-pressure water nozzle and the This is an electric resistance welding pipe welding device for black leather material that is characterized by removing scale by spraying high-pressure liquid of 10 kg/cm 2 or more from an internal high-pressure nozzle in the direction of the fine pass roll.
次にこの発明を図面にもとづいて説明する。第
２図は、管状スケルプ１をフインパスロール１１
等の成形ロールによつて成形後ワークコイル３に
よつて主としてスケルプエツジ７を高周波誘導加
熱し、溶接ロール４で圧接して管２を造管してい
る状況を示す管軸方向断面図であり第３図は第２
図のＡ−Ａ断面図、第４図は第２図はＢ−Ｂ断面
図である。スポツト欠陥の防止のためにＶ点ブロ
ー８、ワークコイル洗浄ノズル９、及びインピー
ダ洗浄ノズル１０を使用することは従来法に同じ
であるが、本発明ではフインパスロール１１とワ
ークコイル３間に外面高圧水ノズル１７と内面高
圧水ノズル１５を設けて管状スケルプの剥離して
スポツト欠陥の原因になるスケールをフインパス
ロール側に吹飛して除去し、インピーダ５及び溶
接点６側に剥離したスケールを持込まないことが
特徴である。高圧水には水および／または、水溶
性油を用いて、吹付角度は管軸方向に対して30〜
70゜で使用する。これは角度が小さすぎるとデス
ケーリング能力が落ちてくるし、大きすぎると剥
離したスケールが下流側に飛散するためである。 Next, this invention will be explained based on the drawings. Figure 2 shows the tubular skelp 1 and the fin pass roll 11.
This is a cross-sectional view in the tube axis direction showing a situation in which a pipe 2 is formed by high-frequency induction heating by a work coil 3 after forming by a forming roll such as the like, and then pressure-welded by a welding roll 4 to form a tube 2. Figure 3 is the second
4 and 2 are sectional views taken along line BB. The use of the V point blow 8, work coil cleaning nozzle 9, and impeder cleaning nozzle 10 to prevent spot defects is the same as in the conventional method, but in the present invention, the outer surface between the fin pass roll 11 and the work coil 3 is A high-pressure water nozzle 17 and an internal high-pressure water nozzle 15 are installed to blow away scale that causes spot defects due to peeling of the tubular scale to the fin pass roll side, and remove the scale that has peeled off on the impeder 5 and welding point 6 side. It is characterized by not bringing in Water and/or water-soluble oil is used for high-pressure water, and the spray angle is 30 to 30 degrees with respect to the pipe axis direction.
Use at 70°. This is because if the angle is too small, the descaling ability will deteriorate, and if the angle is too large, the peeled scale will scatter downstream.
高圧水の圧力は、第５図に示すように10Kg／cm2
以上あれば洗浄効果のためにスポツト欠陥の防止
に効果があるが、デスケーリングにより確実な効
果を期待するためには30Kg／cm2以上が必要であ
る。 The pressure of high-pressure water is 10Kg/cm 2 as shown in Figure 5.
If the amount is above 30 kg/cm 2 , it is effective in preventing spot defects due to the cleaning effect, but in order to expect a reliable effect from descaling, 30 kg/cm 2 or more is required.
これは、成形前のスケールは非常にタイトであ
り100Kg／cm2以上の高圧水でも殆んどデスケール
できないが、成形後は成形加工によりスケールが
剥離し易い状態になるため30Kg／cm2以上もあれば
溶接時に問題になるスケールを完全に除去できる
ことによる。 This is because the scale before molding is very tight and can hardly be descaled even with high-pressure water of 100Kg/cm2 or more, but after molding, the scale becomes easily peeled off due to the molding process, so it can be descaled even with water of 30Kg/cm2 or more. This is because scale, which can cause problems during welding, can be completely removed.
内面高圧水ノズル１５は、インピーダ５を支持
する支持管１２の円周上に設けられ、管状スケル
プ１の全周に高圧水を吹付ける。内面洗浄用高圧
水は、導入管１６から送り込まれ、支持管１２と
支持管１２をとり巻く外管１３間のすきまを実線
矢印の方向に送られ、内面高圧水ノズル１５から
吹出される。吹出された高圧水はデスケーリング
後スケールと共に内面せき１８の径小部１４と管
状スケルプ１間を高速で流れ、傾斜面１９に沿つ
て実線矢印の方向に進み、スケルプエツジ７，
７′から管外に排出される。 The internal high-pressure water nozzle 15 is provided on the circumference of the support tube 12 that supports the impeder 5, and sprays high-pressure water around the entire circumference of the tubular squelp 1. High-pressure water for cleaning the inner surface is fed from the introduction pipe 16, sent through the gap between the support tube 12 and the outer tube 13 surrounding the support tube 12 in the direction of the solid arrow, and is blown out from the inner high-pressure water nozzle 15. The blown out high-pressure water flows at high speed between the small diameter part 14 of the inner weir 18 and the tubular skelp 1 together with the scale after descaling, advances along the slope 19 in the direction of the solid arrow, and reaches the skelp edge 7,
It is discharged outside the tube from 7'.
従つて管内の剥離し易いスケールは全て管外に
除去され、インピーダ５の方向に流れない。内面
せき１８には、スポンジ等の耐摩耗性弾性体を用
い、径小部１４は高圧水の流速を保ちスケールを
押し流すために管状スケルプ１との間隔が数mmに
なるように設けられ、傾斜面１９は高圧水の流れ
によつてスケールが管外に押し出されるよう管軸
方向との角度が60゜以下になるよう設ける。なお、
内面せきは要するに高圧水によりスケールがスケ
ルプエツジ７，７′間から除去するための機能が
あれば良いので必ずしもこの形状にこだわらな
い。 Therefore, all easily peelable scale within the tube is removed to the outside of the tube and does not flow in the direction of the impeder 5. The inner weir 18 is made of a wear-resistant elastic material such as sponge, and the small diameter part 14 is provided with a distance of several mm from the tubular scale 1 to maintain the flow rate of high-pressure water and wash away the scale. The surface 19 is provided so that the angle with the tube axis direction is 60° or less so that the scale is pushed out of the tube by the flow of high-pressure water. In addition,
The inner weir is not necessarily limited to this shape as long as it has the function of removing scale from between the scale edges 7 and 7' using high-pressure water.
外面側洗浄用の高圧水は、スポツト欠陥の防止
対策としては外面側高圧水ノズル１７によりスケ
ルプエツジ７，７′近傍をデスケーリングすれば
良いがワークコイルにスケールが付着するとワー
クコイルの焼損を招くので全周をデスケーリング
するノズルを設ける方が望ましい。 As a measure to prevent spot defects, high-pressure water for cleaning the outer surface can be used to descale the vicinity of the scale edges 7 and 7' using the outer high-pressure water nozzle 17, but if scale adheres to the work coil, it will cause burnout of the work coil. It is preferable to provide a nozzle that descales the entire circumference.
以下この発明の実施例を示す。 Examples of this invention will be shown below.
(1) 実施条件
供試材 API 5AN−80 黒皮材
60.3φ×4.83t
造管条件 ワークコイル距離 160mm
造管速度 45ｍ／分
高圧水条件
・高圧水：日本バーカーSF101 ３％水溶液
・圧力：０，10，30，50Kg／cm2
・外面高圧水ノズル：スケルプエツジ部近傍
のみ吹付け
・流量：200／分（外面＋内面）
・吹付角度：45゜（外面、内面共）
・内面高圧水ノズル：管内面全周吹付け
中間せき
・径小部と管状スケルプ間ギヤツプ：２mm
・傾斜面角度：45゜
・材質：ネオスポンジ
(2) 結果
第５図に示したように、30Kg／cm2以上の高圧水
洗浄によりスポツト欠陥の発生が防止できた。(1) Implementation conditions Test material API 5AN-80 Black bark material 60.3φ×4.83t Pipe making conditions Work coil distance 160 mm Pipe making speed 45 m/min High pressure water conditions ・High pressure water: Nippon Barker SF101 3% aqueous solution ・Pressure: 0 , 10, 30, 50Kg/cm 2 - External high pressure water nozzle: Sprays only near the squelp edge - Flow rate: 200/min (external + internal) - Spraying angle: 45° (both external and internal) - Internal high pressure water nozzle: Spraying all around the inner surface of the pipe Intermediate weir ・Gap between small diameter part and tubular skelp: 2mm ・Slope angle: 45° ・Material: Neo sponge (2) Results As shown in Figure 5, 30Kg/cm2 or more Spot defects were prevented by high-pressure water cleaning.
以上のようにこの発明によれば従来の方法では
発生防止が不可能であつた黒皮材のスケール噛込
みによるスポツト欠陥を防止することができ、ま
た、従来の全ての電縫管ミルに適用可能である。
この発明の説明にはワークコイルによる誘導加熱
の場合を述べたが第６図に示すようなコンタクト
チツプによる直接通電加熱による場合でも全く同
じように使用できることは言うまでもない。 As described above, according to the present invention, it is possible to prevent spot defects caused by scale entrainment of black bark material, which could not be prevented by conventional methods, and it is also applicable to all conventional ERW tube mills. It is possible.
Although the present invention has been described using induction heating using a work coil, it goes without saying that direct current heating using a contact chip as shown in FIG. 6 can be used in exactly the same way.
第１図は従来の溶接装置を示す管軸方向断面
図、第２図はこの発明による溶接装置の管軸方向
断面図、第３図は第２図のＡ−Ａ線断面図、第４
図は第２図のＢ−Ｂ線断面図、第５図はこの発明
の実施効果を示す図である。第６図は従来法にお
けるワークコイルの代わりにコンタクトチツプを
用いた場合の図である。
１は管状スケルプ、２は管、３はワークコイ
ル、４は溶接ロール、５はインピーダ、６は溶接
点、７はスケルプエツジ、８はＶ点ブロー、９は
ワークコイル洗浄ノズル、１０はインピーダ洗浄
ノズル、１１はフインパスロール、１２は支持
管、１３は外管、１４は径小部、１５は内面高圧
水ノズル、１６は導入管、１７は外面高圧水ノズ
ル、１８は内面せき、１９は傾斜面、２０はコン
タクトチツプ。
1 is a sectional view in the tube axis direction showing a conventional welding device, FIG. 2 is a sectional view in the tube axis direction of a welding device according to the present invention, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG.
The figure is a sectional view taken along the line B--B in FIG. 2, and FIG. 5 is a diagram showing the effect of implementing the present invention. FIG. 6 shows a case where a contact tip is used instead of the work coil in the conventional method. 1 is a tubular skelp, 2 is a tube, 3 is a work coil, 4 is a welding roll, 5 is an impeder, 6 is a welding point, 7 is a squelp edge, 8 is a V point blow, 9 is a work coil cleaning nozzle, 10 is an impeder cleaning nozzle , 11 is a fin pass roll, 12 is a support pipe, 13 is an outer pipe, 14 is a small diameter part, 15 is an inner high pressure water nozzle, 16 is an introduction pipe, 17 is an outer high pressure water nozzle, 18 is an inner weir, 19 is an inclined 20 is a contact chip.
Claims (1)
プを素材とする電縫管ミルにおいて、フインパス
ロールとワークコイルまたは、コンタクトチツプ
間の位置で、管条スケルプの外側に外面高圧水ノ
ズルと内面側には、導入管を介して内面高圧ノズ
ルとを設け、内面側にはさらに前記内面高圧ノズ
ルから噴射された水または水溶液をスケルプエツ
ジ部に導く内面せきを設けて、前記外面高圧水ノ
ズルと前記内面高圧ノズルとからフインパスロー
ル方向に向けて10Kg／cm2以上の高圧液を吹きつけ
てスケールを除去することを特徴とする黒皮材の
電縫管溶接装置。1. In an electric resistance welding tube mill in which hot-rolled coils are made from unpickled skelp, an external high-pressure water nozzle is installed on the outside of the tube skelp at a position between the fin pass roll and the work coil or contact tip. An inner high-pressure nozzle is provided on the inner surface via an inlet pipe, and an inner weir is further provided on the inner surface to guide water or aqueous solution injected from the inner high-pressure nozzle to the squelp edge part, and the outer high-pressure water nozzle and An apparatus for welding electric resistance welded pipes for black skin material, characterized in that scale is removed by spraying a high pressure liquid of 10 kg/cm 2 or more from the inner high pressure nozzle in the direction of the fine pass roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8727082A JPS58205688A (en) | 1982-05-25 | 1982-05-25 | Apparatus for welding black skinned electric welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8727082A JPS58205688A (en) | 1982-05-25 | 1982-05-25 | Apparatus for welding black skinned electric welded pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58205688A JPS58205688A (en) | 1983-11-30 |
| JPH0250835B2 true JPH0250835B2 (en) | 1990-11-05 |
Family
ID=13910067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8727082A Granted JPS58205688A (en) | 1982-05-25 | 1982-05-25 | Apparatus for welding black skinned electric welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58205688A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0825035B2 (en) * | 1990-11-08 | 1996-03-13 | 日本鋼管株式会社 | Gas seal welding method for ERW pipe |
-
1982
- 1982-05-25 JP JP8727082A patent/JPS58205688A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58205688A (en) | 1983-11-30 |
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