JPH03155479A - Welding control method for resistance welded tube - Google Patents
Welding control method for resistance welded tubeInfo
- Publication number
- JPH03155479A JPH03155479A JP29386989A JP29386989A JPH03155479A JP H03155479 A JPH03155479 A JP H03155479A JP 29386989 A JP29386989 A JP 29386989A JP 29386989 A JP29386989 A JP 29386989A JP H03155479 A JPH03155479 A JP H03155479A
- Authority
- JP
- Japan
- Prior art keywords
- shape
- bead
- welding
- peak temperature
- heating width
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 21
- 239000011324 bead Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 230000006698 induction Effects 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、突合せ形状、アプセット量を考慮した電縫管
の溶接制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a welding control method for electric resistance welded pipes that takes into account the butt shape and upset amount.
［従来の技術］
例えば従来の電縫鋼管は、素材の薄板鋼板を一群の成形
ロールによって円筒状に連続成形しくロールフォーミン
グ）、オープンパイプの合わせ目に抵抗法または誘導法
により電流を発生させてその合わせ目を左右一対のスク
イズロールにより加圧・接合することにより、連続的に
製造される。[Prior Art] For example, conventional electric resistance welded steel pipes are made by continuously forming a thin steel plate into a cylindrical shape using a group of forming rolls (roll forming), and then generating an electric current at the joint of the open pipe using a resistance method or an induction method. It is manufactured continuously by pressurizing and joining the seams with a pair of right and left squeeze rolls.
このとき発生させる電流量ないし溶接入熱量により、溶
接部の品質が決定される。The quality of the welded part is determined by the amount of current generated at this time or the amount of welding heat input.
そこで従来は、この溶接部のピーク温度、あるいは加熱
幅などを目標値として溶接の制御を行っていた。Conventionally, welding has been controlled using the peak temperature or heating width of the welded portion as a target value.
第３図はこのような従来の溶接制御方法を示す概念図で
ある。すなわち、素材の薄板鋼板１をアンコイラしなが
ら一群の成形ロール２がら成るロールフォーミング部３
で次第に円筒状に成形していく。成形後のオーブンパイ
プ１０ａを加圧・接合するために配置された左右一対の
スクイズロール４の手前に高周波誘導コイル５を設け、
高周波誘導コイル５に電源装置６より所定の高周波電流
を通じてオーブンパイプ１０ａの合わせ目を加熱し、直
ちにその合わせ目をスクイズロール４で加圧・接合する
。スクイズロール４の直後には電縫鋼管１０ｂの溶接シ
ーム部１１の上方にビード幅方向にリニアアレイ温度計
７が配置されており、溶接シーム部１１の幅方向の温度
分布と加熱幅を非接触方式で測定するようになっている
。そして、測定された温度分布中のピーク温度あるいは
加熱幅を検出し、検出値を制御装置８に入力し、制御装
置８においてその検出値が、ピーク温度の目標値として
与えられた設定温度幅、例えば１１００℃〜１２００℃
、あるいは加熱幅の目標値として与えられた、合わせ目
付近の温度分布が所定の温度以上となる部分の幅、例え
ば管サイズ２７１゜３φ關のとき５關、といった所定の
目標値内に入るように電源装置６の電流をフィードバッ
ク制御している。これによりオープンパイプ１０ａの合
わせ目に加えられる溶接入熱量が制御される。溶接シー
ム部１１はその後ビードカッター（図示せず）により除
去される。FIG. 3 is a conceptual diagram showing such a conventional welding control method. That is, a roll forming section 3 consisting of a group of forming rolls 2 while uncoiling a thin steel plate 1 as a raw material.
Gradually form it into a cylindrical shape. A high frequency induction coil 5 is provided in front of a pair of left and right squeeze rolls 4 arranged to press and join the oven pipe 10a after molding.
A predetermined high-frequency current is passed through the high-frequency induction coil 5 from the power supply 6 to heat the seam of the oven pipe 10a, and the seam is immediately pressed and joined with the squeeze roll 4. Immediately after the squeeze roll 4, a linear array thermometer 7 is arranged in the bead width direction above the weld seam 11 of the ERW steel pipe 10b, and it measures the temperature distribution in the width direction of the weld seam 11 and the heating width in a non-contact manner. It is designed to be measured using a method. Then, the peak temperature or heating width in the measured temperature distribution is detected, the detected value is input to the control device 8, and the detected value is used as the set temperature width given as the target value of the peak temperature in the control device 8. For example 1100℃~1200℃
Or, the width of the part where the temperature distribution near the seam exceeds a predetermined temperature given as a target value for the heating width, for example, 5 degrees for a pipe size of 271° and 3φ, so that it falls within a prescribed target value. The current of the power supply device 6 is feedback-controlled. This controls the amount of welding heat input added to the joint of the open pipe 10a. The weld seam 11 is then removed by a bead cutter (not shown).
［発明が解決しようとする課題］
電縫管の溶接品質を決定する三大要因として、（１）溶
接入熱 （２）突合せ形状 （３）アブセ・ソト量（圧
接力）があることは良く知られている。この溶接品質を
確保するためには、これらの要因が最も適した状態にコ
ントロールされなければならない。[Problem to be solved by the invention] It is well known that the three major factors that determine the welding quality of electric resistance welded pipes are (1) welding heat input, (2) butt shape, and (3) amount of absethe/soot (pressure welding force). Are known. In order to ensure this welding quality, these factors must be controlled in the most suitable state.
従来の電縫管の溶接制御方法は、前述のように溶接部の
ピーク温度あるいは加熱幅を検出し、その検出値があら
かじめ設定された目標値内に入るように、オープンパイ
プの合わせ目に加えられる溶接入熱量を制御するもので
あった。The conventional welding control method for electric resistance welded pipes is to detect the peak temperature or heating width of the welded part as described above, and then add the temperature to the seam of the open pipe so that the detected value falls within a preset target value. This was to control the amount of welding heat input.
しかしながら、ロール組替後の突合せ形状、アプセット
量を前回の同一外径と同じに設定したとしても、同一コ
イル内もしくはコイル間において強度のバラツキ等、材
質もしくは寸法が変化することによって再現することは
極めて困難であり、突合せ形状、アプセット量が変化し
た場合、溶接品質の低下をひき起こす可能性があった。However, even if the butt shape and upset amount after roll recombination are set to the same outer diameter as the previous one, variations in strength within the same coil or between coils cannot be reproduced due to changes in material or dimensions. This is extremely difficult, and if the butt shape or upset amount changes, there is a possibility that welding quality will deteriorate.
したがって、本発明の目的は、溶接部の品質確保のため
に、突合せ形状、アプセット量を考慮した電縫管の溶接
制御方法を提供することにある。Therefore, an object of the present invention is to provide a welding control method for an electric resistance welded pipe that takes into consideration the butt shape and the amount of upset in order to ensure the quality of the welded portion.
［課題を解決するための手段］
上記の目的を達成するために、本発明に係る電縫管の溶
接制御方法は、上述のように電縫管の溶接部のピーク温
度あるいは加熱幅を検出し、該ピーク温度あるいは加熱
幅の検出値が所定の目標値内に入るようにオープンパイ
プの合わせ目に加える溶接入熱量を制御する場合におい
て、さらに前記溶接部の断面のシーム形状をパラメータ
化した制御系を付加したもので、溶接部のシーム形状を
撮像し、得られた画像を処理して形状パラメータを求め
、該形状パラメータにより前記ピーク温度あるいは加熱
幅の目標値を補正計算し、この補正値を改めて設定値と
して前記溶接入熱量を制御することとしたものである。[Means for Solving the Problem] In order to achieve the above object, the welding control method for an ERW pipe according to the present invention detects the peak temperature or heating width of the welded portion of the ERW pipe as described above. , when controlling the amount of welding heat input added to the seam of open pipes so that the detected value of the peak temperature or heating width falls within a predetermined target value, the control further parameterizing the seam shape of the cross section of the welded part. This system images the seam shape of the welded part, processes the obtained image to obtain shape parameters, corrects and calculates the target value of the peak temperature or heating width using the shape parameters, and calculates this correction value. The welding heat input is controlled by setting the value as a new set value.
［作 用］
突合せ形状及びアプセットａは溶接入熱量とともに電縫
管の溶接部の品質を決定する最重要因子の一つであり、
突合せ形状及びアプセット量の多寡は溶接部のビード形
状に直接影響を与える。そこでまず、溶接部断面のビー
ド形状を適当な方法で撮像し、その画像を処理して形状
パラメータを求め、次に該形状パラメータによりピーク
温度あるいは加熱幅の目標値を補正計算してその補正値
を改めて設定値として前記溶接入熱量を制御することに
すれば、素材交換に伴い突合せ形状、アプセット量が微
妙に変化した場合であっても、その突合せ形状、アプセ
ットａに対応した適正な溶接入熱量となり、溶接部の品
質の確保が計れる。なお、形状パラメータとしては、例
えばビード下幅、中央部ビード高さ、最大ビード高さ、
ビード断面積等である。これらの１または２以上の形状
パラメータを用いてピーク温度あるいは加熱幅の目標値
を補正する。[Function] The butt shape and upset a, together with the welding heat input, are one of the most important factors that determine the quality of the welded part of the ERW pipe.
The butt shape and amount of upset directly affect the bead shape of the weld. Therefore, first, the bead shape of the cross section of the weld is imaged using an appropriate method, the image is processed to determine the shape parameters, and then the target value of the peak temperature or heating width is corrected and calculated using the shape parameters, and the corrected value is calculated. If we decide to control the welding heat input using the set value again, even if the butt shape and upset amount change slightly due to material exchange, the welding input can be adjusted appropriately according to the butt shape and upset amount a. The amount of heat can be measured to ensure the quality of the welded part. Note that the shape parameters include, for example, the lower bead width, the center bead height, the maximum bead height,
bead cross-sectional area, etc. The target value of the peak temperature or heating width is corrected using one or more of these shape parameters.
［実施例］
第１図は本発明方法を適用した制御ブロック図であり、
図において、第３図と同一符号は同一のものを示す。[Example] FIG. 1 is a control block diagram to which the method of the present invention is applied,
In the figure, the same reference numerals as in FIG. 3 indicate the same parts.
第１図に示すように、ビード形状計１２をスクイズロー
ル４の直後に配置し、溶接シーム部１１の断面形状を撮
像する。このビード形状計１２は、本出願人に係る、例
えば特公昭６０−６７５５号公報に示された形状検出装
置を利用することができる。これは、光切断法を利用し
たもので、レーザビームのスリット光を溶接シーム部１
１に対し斜め上方から照射し、その反射光をＩＴＶカメ
ラで撮像するようにしたものである。As shown in FIG. 1, a bead shape meter 12 is placed immediately after the squeeze roll 4 to image the cross-sectional shape of the weld seam portion 11. As the bead shape meter 12, a shape detection device disclosed in, for example, Japanese Patent Publication No. 60-6755 by the present applicant can be used. This method uses a light cutting method, and the slit light of the laser beam is applied to the welding seam.
1 from diagonally above, and the reflected light is imaged by an ITV camera.
上記のビード形状計１２により撮像された溶接シーム部
１１の画像信号は画像処理回路１３に入力され、ここで
２値化等の方法により処理してビード断面形状を抽出し
、ビード形状１１ａを得る。The image signal of the weld seam 11 captured by the bead shape meter 12 is input to the image processing circuit 13, where it is processed by a method such as binarization to extract the bead cross-sectional shape and obtain the bead shape 11a. .
第２図はこのようにして得られたビード形状の一例を示
したものである。第２図に示すように、アプセット後の
ビード形状１１ａは通常、中央部が多少凹んだ山形状の
形状を呈しており、次にこのビード形状１１ａから、例
えばビード下幅Ａ（ビード形状１１ａの鋼管表面１０ｃ
から立ち上がる角部分の幅）、中央部ビード高さＢ（ビ
ード形状１１ａの中央凹み部１１ｂから鋼管表面、１０
Ｃまでの高さ）、最大ビード高さＣ（ビード形状１１Ｈ
の最大頂部１１ｃから鋼管表面１０ｃまでの高さ）、ビ
ード断面積Ｄ（図示の斜線部の面積）等を形状パラメー
タとして求める。FIG. 2 shows an example of the bead shape obtained in this manner. As shown in FIG. 2, the bead shape 11a after upsetting usually has a mountain-like shape with a somewhat concave center, and then from this bead shape 11a, for example, the lower width A of the bead Steel pipe surface 10c
width of the corner rising from the center), central bead height B (from the central concave portion 11b of the bead shape 11a to the steel pipe surface, 10
C), maximum bead height C (bead shape 11H
The height from the maximum top 11c to the surface 10c of the steel pipe), the bead cross-sectional area D (the area of the hatched part in the figure), etc. are determined as shape parameters.
次に、この形状パラメータの例えばビード断面積りを用
いて制御装置８で溶接シーム部１１のピーク温度あるい
は加熱幅の目標値を補正計算する。Next, using this shape parameter, for example, the bead cross-sectional area, the control device 8 corrects and calculates a target value for the peak temperature or heating width of the weld seam portion 11.
そして、この補正値を改めてピーク温度あるいは加熱幅
の設定値として電源装置６の電流を制御し、高周波誘導
コイル５によりオープンパイプの合わせ目に加えるべき
溶接入熱量を制御するのである。Then, the current of the power supply device 6 is controlled by using this correction value as a new set value of the peak temperature or heating width, and the amount of welding heat input to be added to the joint of the open pipe by the high frequency induction coil 5 is controlled.
補正値は例えばピーク温度の場合、従来の１１００℃〜
１２００℃の目標値を１１００℃〜１１５０℃のように
突合せ形状及びアプセット量を加味した値とすることが
できる。For example, in the case of peak temperature, the correction value is 1100℃~
The target value of 1200°C can be set to a value such as 1100°C to 1150°C that takes into account the butt shape and upset amount.
したがって、リニアアレイ温度計等のシーム温度検出器
あるいは加熱幅検出器７による検出値がこの変更された
目標値内に入るように溶接入熱量を制御する。このよう
に突合せ形状及びアプセット量を考慮した形状パラメー
タによる補正目標値でもって溶接入熱量を制御するので
、素材交換に伴い突合せ形状及びアプセットｆｆｉが微
妙に変化した場合であっても、溶接部の品質を高品質に
維持することができる。Therefore, the welding heat input amount is controlled so that the value detected by the seam temperature detector such as a linear array thermometer or the heating width detector 7 falls within the changed target value. In this way, the welding heat input is controlled using the corrected target value based on the shape parameter that takes into account the butt shape and the amount of upset, so even if the butt shape and upset ffi change slightly due to material exchange, the welding part It is possible to maintain high quality.
なお、上記実施例では高周波誘導コイル５に誘導法の場
合について説明したが、コンタクトチップを用いる抵抗
法でも同様である。In the above embodiment, the induction method using the high-frequency induction coil 5 has been described, but the same applies to the resistance method using a contact tip.
［発明の効果］
以上のように本発明によれば、電縫管の溶接部のピーク
温度あるいは加熱幅をフィードバック制御する系に加え
てビードの断面形状から形状パラメータを求め、この形
状パラメータを用いて溶接部のピーク温度あるいは加熱
幅の目標値を補正する制御系を設け、補正値を改めて設
定値として溶接入熱量を適正に制御するようにしたので
、突合せ形状及びアプセット量を考慮した電縫管の溶接
制御が可能になり、素材交換にあたっても溶接部品質を
高く維持でき、かつ生産性の向上に役立つという効果が
得られる。[Effects of the Invention] As described above, according to the present invention, in addition to a system that feedback controls the peak temperature or heating width of the welded portion of an ERW pipe, a shape parameter is determined from the cross-sectional shape of the bead, and this shape parameter is used. We installed a control system that corrects the target value of the peak temperature or heating width of the weld zone, and used the correction value as the set value to appropriately control the welding heat input. This makes it possible to control pipe welding, maintains high quality welds even when changing materials, and helps improve productivity.
第１図は本発明の電縫管の溶接制御方法に適用する制御
ブロック図、第２図は溶接部断面のシーム形状の一例を
示す図、第３図は従来の電縫管溶接制御方法の制御ブロ
ック図である。
５・・・高周波誘導コイル
６・・・電源装置
７・・・シーム温度検出器あるいは加熱幅検出器８・・
・制御装置
１０ａ・・・オーブンパイプ
１０ｂ・・・電縫管
１１・・・溶接シーム部
１１ａ・・・ビード形状
１２・・・ビード形状計
１３・・・画像処理回路Fig. 1 is a control block diagram applied to the ERW pipe welding control method of the present invention, Fig. 2 is a diagram showing an example of a seam shape in a cross section of a welded part, and Fig. 3 is a control block diagram of the conventional ERW pipe welding control method. It is a control block diagram. 5... High frequency induction coil 6... Power supply device 7... Seam temperature detector or heating width detector 8...
-Control device 10a...Oven pipe 10b...Erw tube 11...Weld seam portion 11a...Bead shape 12...Bead shape meter 13...Image processing circuit
Claims (1)
該ピーク温度あるいは加熱幅の検出値が所定の目標値内
に入るようにオープンパイプの合わせ目に加える溶接入
熱量を制御する電縫管の溶接制御方法において、 前記溶接部の断面のビード形状を撮像し、得られた画像
を処理して形状パラメータを求め、該形状パラメータに
より前記ピーク温度あるいは加熱幅の目標値を補正計算
し、この補正値を設定値として前記溶接入熱量を制御す
ることを特徴とする電縫管の溶接制御方法。[Claims] Detecting the peak temperature or heating width of a welded part of an ERW pipe,
In an electric resistance welding pipe welding control method for controlling the amount of welding heat input added to a joint of an open pipe so that the detected value of the peak temperature or heating width falls within a predetermined target value, the bead shape of the cross section of the welded part is The welding heat input amount is controlled by capturing an image, processing the obtained image to obtain a shape parameter, correcting and calculating the target value of the peak temperature or heating width using the shape parameter, and using this correction value as a set value. Features: Welding control method for ERW pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29386989A JPH03155479A (en) | 1989-11-14 | 1989-11-14 | Welding control method for resistance welded tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29386989A JPH03155479A (en) | 1989-11-14 | 1989-11-14 | Welding control method for resistance welded tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03155479A true JPH03155479A (en) | 1991-07-03 |
Family
ID=17800206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29386989A Pending JPH03155479A (en) | 1989-11-14 | 1989-11-14 | Welding control method for resistance welded tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03155479A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0566834A2 (en) * | 1992-03-25 | 1993-10-27 | Kabushiki Kaisha Meidensha | Tube production machine |
| CN104889547A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding based welding method |
| CN104889535A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding based intelligent welding process |
| CN104889615A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Intelligent welding method with safety protection |
| CN104889537A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding intelligent welding method |
| CN104889536A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding based intelligent welding method with safety protection |
| CN105033478A (en) * | 2015-05-15 | 2015-11-11 | 无锡阳工机械制造有限公司 | Welding method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS607584A (en) * | 1983-06-27 | 1985-01-16 | Shimadzu Corp | Video contour extractor |
| JPS63224883A (en) * | 1987-03-12 | 1988-09-19 | Nippon Steel Corp | Warm resistance welding method |
-
1989
- 1989-11-14 JP JP29386989A patent/JPH03155479A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS607584A (en) * | 1983-06-27 | 1985-01-16 | Shimadzu Corp | Video contour extractor |
| JPS63224883A (en) * | 1987-03-12 | 1988-09-19 | Nippon Steel Corp | Warm resistance welding method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0566834A2 (en) * | 1992-03-25 | 1993-10-27 | Kabushiki Kaisha Meidensha | Tube production machine |
| EP0670194A1 (en) * | 1992-03-25 | 1995-09-06 | Kabushiki Kaisha Meidensha | Welding management apparatus |
| CN104889547A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding based welding method |
| CN104889535A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding based intelligent welding process |
| CN104889615A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Intelligent welding method with safety protection |
| CN104889537A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding intelligent welding method |
| CN104889536A (en) * | 2015-05-15 | 2015-09-09 | 无锡阳工机械制造有限公司 | Argon arc welding based intelligent welding method with safety protection |
| CN105033478A (en) * | 2015-05-15 | 2015-11-11 | 无锡阳工机械制造有限公司 | Welding method |
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