JPS5819032Y2 - V-seam welding equipment for ERW pipes - Google Patents
V-seam welding equipment for ERW pipesInfo
- Publication number
- JPS5819032Y2 JPS5819032Y2 JP1977085636U JP8563677U JPS5819032Y2 JP S5819032 Y2 JPS5819032 Y2 JP S5819032Y2 JP 1977085636 U JP1977085636 U JP 1977085636U JP 8563677 U JP8563677 U JP 8563677U JP S5819032 Y2 JPS5819032 Y2 JP S5819032Y2
- Authority
- JP
- Japan
- Prior art keywords
- seam
- welding
- power supply
- variable power
- detection coil
- 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
Links
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
本考案は、電縫管のVシーム溶接装置に係り、特に溶接
電流を自動的に適正値に制御する電縫管のVシーム溶接
装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a V-seam welding device for electric resistance welded tubes, and more particularly to a V-seam welding device for electric resistance welded tubes that automatically controls welding current to an appropriate value.
ストリップ材を管状に成形し、その両縁部を突合せてV
シーム部を形威し、誘導コイル(ワークコイル)に高周
波電源を接続するか、又はVシーム部に高周波電圧を印
加する等して、該■シーム部を電気抵抗加熱により溶融
温度にまで加熱し、その両縁部を圧接して接合するVシ
ーム電気抵抗加熱溶接法においては、ストリップ材を管
状に成形する最終フィンパスロール、シームガイドロー
ル、スクイズロール間の寸法、周長等の機械的寸法並び
1に溶接速度(管の速度)で決る周期に基き、シーム部
の拡角がわずかながら交番的に変動する。Form the strip material into a tube shape, and butt both edges to form a V.
Shape the seam, connect a high-frequency power source to an induction coil (work coil), or apply a high-frequency voltage to the V-seam, and heat the seam to a melting temperature by electrical resistance heating. In the V-seam electric resistance heat welding method, which presses and joins both edges, the mechanical dimensions such as the dimensions between the final fin pass roll, seam guide roll, and squeeze roll that form the strip material into a tube shape, and the circumference. Based on the cycle determined by the welding speed (tube speed) and the welding speed (tube speed), the widening angle of the seam portion changes slightly but alternately.
それは第1図に示す通り、拡角θが変動することは、管
1の両縁部2,2′の間隔が、W、、W2のように変化
することである。As shown in FIG. 1, the variation of the widening angle θ means that the distance between both edges 2, 2' of the tube 1 varies as W, . . . W2.
このため、入熱が一定であっても、前記拡角θが違うと
溶接電流が変化し、溶接温度が変化する。Therefore, even if the heat input is constant, if the expansion angle θ is different, the welding current changes and the welding temperature changes.
振動周期Tと溶接速度C8pとの関係は、第2図のグラ
フに示す通りである。The relationship between the vibration period T and the welding speed C8p is as shown in the graph of FIG.
即ち、溶接速度が速い場合、管の速度等で決る振動周期
が短かくなるため、溶接品質に影響は少ないが、しかし
、溶接速度が遅くなると、振動周期が長くなり、必然、
■シーム部の溶接温度ムラが顕著となり、溶接品質にム
ラを生じて所定の溶接強度が得られない。In other words, when the welding speed is high, the vibration period determined by the pipe speed etc. becomes short, so there is little effect on welding quality. However, when the welding speed is slow, the vibration period becomes longer, which inevitably causes
■Welding temperature unevenness at the seam becomes noticeable, causing unevenness in welding quality and making it impossible to obtain the specified welding strength.
このような次第で、従来、溶接速度が8m/min以下
の低速では、溶接強度が出ないため、溶接は不可能視さ
れていた。Under these circumstances, it has conventionally been considered impossible to weld at a low welding speed of 8 m/min or less because welding strength is not achieved.
かかる問題を解決するために、■シーム部の溶接電流を
検出し、それを電源装置へフィードバックし、一定の溶
接温度が得られるようにした溶接装置が知られている。In order to solve this problem, a welding device is known which detects the welding current at the seam and feeds it back to the power supply to obtain a constant welding temperature.
従来、溶接電流を検出するために、例えばうずまき形の
検出コイルを■シーム部に対向配置した装置が使用され
ている。Conventionally, in order to detect welding current, a device has been used in which, for example, a spiral-shaped detection coil is placed opposite the seam.
しかしながら、この装置では、■シーム部の拡角θや管
径が変化した際に、検出感度にずれを生じ、精度のよい
溶接電流が得られなかった。However, with this device, (1) when the expansion angle θ of the seam portion or the pipe diameter changed, a shift occurred in the detection sensitivity, and a highly accurate welding current could not be obtained.
本考案は、かかる従来の難点に鑑みてなされたもので、
Vシーム部における溶接電流を精度よく検出し、特に低
速溶接時の温度ムラ、溶接品質のムラを解消し、所定の
溶接強度を得ることができる電縫管のVシーム溶接装置
を提供することを目的としている。The present invention was made in view of these conventional difficulties.
It is an object of the present invention to provide a V-seam welding device for electric resistance welded pipes that can accurately detect the welding current at the V-seam part, eliminate temperature unevenness and welding quality unevenness especially during low-speed welding, and obtain a predetermined welding strength. The purpose is
かかる目的を達成するために、本考案は、ストリップ材
を管状に成形しその両縁部を突合せて■シーム部を形威
し、該■シーム部に高周波可変電源装置より電力を供給
して電気抵抗加熱により溶融温度まで加熱し、前記両縁
部を圧接して接合する溶接装置において、前記■シーム
部を流れる電流に比例した電気量を得るための検出コイ
ルを■シーム部におけるいずれが一方のエツジに添って
巻回して該エツジに添って設け、検出コイルにて検出さ
れた電気量を電圧調整器に印加して設定値との偏差値に
応じた信号を高周波の変電源装置に印加し、この可変電
源装置を介して前記■シーム部を流れる電流を制御する
ように電縫管の■シーム溶接装置を構成したものである
。In order to achieve this purpose, the present invention forms a strip material into a tubular shape, abuts both edges to form a seam part, and supplies electricity to the seam part from a high frequency variable power supply. In a welding device that heats up to a melting temperature by resistance heating and presses and joins both edges, a detection coil is installed to obtain an amount of electricity proportional to the current flowing through the seam. It is wound along the edge and installed along the edge, and the amount of electricity detected by the detection coil is applied to the voltage regulator, and a signal corresponding to the deviation value from the set value is applied to the high frequency transformer power supply device. A seam welding device for electric resistance welding tubes is configured to control the current flowing through the seam portion through this variable power supply device.
以下、第3図A、Bから第5図までを用いて本考案の一
実施例について詳細に説明する。Hereinafter, one embodiment of the present invention will be described in detail using FIGS. 3A and 3B to FIG. 5.
第3図は一般的な電縫管溶接法の略図を示したもので、
同図Aは誘導溶接法による管1とワークコイル3との関
係を示している。Figure 3 shows a schematic diagram of the general electric resistance welding pipe welding method.
Figure A shows the relationship between the tube 1 and the work coil 3 by induction welding.
スクイズロール5の手前側に形成されるVシーム部に、
それを円周方向に包囲する環状のワークコイル3が設置
され、Vシーム部の中には磁束を集中させるコア4が挿
入されている。In the V seam formed on the front side of the squeeze roll 5,
An annular work coil 3 is installed to surround it in the circumferential direction, and a core 4 that concentrates magnetic flux is inserted into the V-seam portion.
第3図Bは接触溶接法による管1とコンタクトチップ6
.6との関係を示す。Figure 3B shows the tube 1 and contact tip 6 made by contact welding.
.. This shows the relationship with 6.
2個のコンタクトチップ6.6は、管1の両縁部に分か
れて設置される。Two contact tips 6.6 are installed separately on both edges of the tube 1.
第4図は本考案を上記誘導溶接法に適用した場合の要部
を示すもので、管1の■シーム部における片側のエツジ
にのみ添ってコイルの行きと帰りが重畳するように巻回
された検出コイル7が、そのエツジに添って設けられて
いる。Figure 4 shows the main part when the present invention is applied to the above induction welding method, in which the coil is wound so that the going and returning coils overlap only along one edge of the seam part of the pipe 1. A detection coil 7 is provided along the edge.
この検出コイル7は、第5図に示すように、整流器8を
介して電圧調整器9に接続されている。This detection coil 7 is connected to a voltage regulator 9 via a rectifier 8, as shown in FIG.
また、電圧調整器9は、発振装置11と対をなして可変
電圧高周波発振装置12を構成する高周波可変電源装置
10に接続されている。Further, the voltage regulator 9 is connected to a high frequency variable power supply device 10 that forms a pair with an oscillation device 11 to constitute a variable voltage high frequency oscillation device 12.
そして、高周波可変電源装置10は、発振装置11を介
してワークコイル3に接続されている。The high frequency variable power supply device 10 is connected to the work coil 3 via an oscillation device 11.
かかる構成の電縫管の■シーム溶接装置においては、V
シーム部に流れている電流に比例した電気量を片側のエ
ツジから検出コイル7により検出する。■ In the seam welding device for electric resistance welded pipes with such a configuration, V
A detection coil 7 detects an amount of electricity proportional to the current flowing through the seam from one edge.
そして、検出された溶接電流の大きさは、整流器8を通
じて整流された信号電流として電圧調整器9に入力され
る。Then, the magnitude of the detected welding current is input to the voltage regulator 9 as a rectified signal current through the rectifier 8.
電圧調整器9においは、予め設定された溶接電流値(設
定値)と比較され、両者の偏差値が求められ増幅された
後に、その偏差値が制御目標値として高周波可変電源装
置10へ人力され、ワークコイル3又はコンタクトチッ
プ6゜6に対する電源入力が一定の溶接電流となるよう
制御されるものである。The voltage in the voltage regulator 9 is compared with a preset welding current value (set value), the deviation value between the two is determined and amplified, and then the deviation value is manually input to the high frequency variable power supply 10 as a control target value. , the power input to the work coil 3 or the contact tip 6.degree. 6 is controlled so that a constant welding current is maintained.
なお、一定の溶接温度を得て溶接ムラを解消するために
は、確実に一定の溶接電流となるように制御する必要が
ある。Note that in order to obtain a constant welding temperature and eliminate welding unevenness, it is necessary to control the welding current to ensure a constant welding current.
それには、いかに精度よく溶接電流を検出してフィード
バックを行なうか否かが重要な問題である。An important issue for this is how accurately the welding current can be detected and fed back.
検出精度を向上するためには、検出コイルが、■シーム
の拡角θや管1の管径が変化しても検出に影響を受けず
、スクイズロール5との間隔の変化に対しても影響を受
けない個所に配設されることが要求される。In order to improve the detection accuracy, the detection coil should be designed such that the detection is not affected by changes in the seam widening angle θ or the pipe diameter of the tube 1, and is not affected by changes in the distance between it and the squeeze roll 5. It is required to be installed in a place where it is not exposed to
また、検出コイルは、原理的に■シーム部のエツジを流
れる溶接電流によって発生する磁束による誘起電圧を検
出することを目的とするものである。The purpose of the detection coil is, in principle, to detect the induced voltage caused by the magnetic flux generated by the welding current flowing through the edge of the seam portion.
したがって、検出コイルの形状としては、溶接電流によ
る発生磁束にのみ有効に鎖交し、その他の漏洩磁束(特
にワークコイル3)には鎖交しないものが望まれる。Therefore, it is desirable that the detection coil has a shape that effectively interlinks only with the magnetic flux generated by the welding current and does not interlink with other leakage magnetic flux (particularly the work coil 3).
これに対し、本考案の電縫管のVシーム溶接装置におけ
る検出コイル7は、前述の如く、管1の■シーム部にお
ける片側のエツジにのみ添ってコイルの行きと帰りが重
畳するように巻回され、直立して設けたものである。In contrast, the detection coil 7 in the V-seam welding device for ERW pipes of the present invention is wound so that the going and returning coils overlap only along one edge of the seam part of the pipe 1, as described above. It is rotated and placed upright.
したがって、検出コイル7は、■シーム部を流れる溶接
電流のうち、片側のエツジを流れる電流に基づく磁束に
のみ有効に鎖交するので、高精度の検出を行なうことが
できる。Therefore, the detection coil 7 effectively intersects only the magnetic flux based on the current flowing through one edge of the welding current flowing through the seam portion, so that highly accurate detection can be performed.
以上の説明から明らかなように、本考案の電縫管の■シ
ーム溶接装置によれば、■シーム部の機械的変化に対す
る応答性に優れ、溶接電流の変化を可及的に小さくシ、
溶接温度を一定に保ち得るので、ムラのない品質で安定
した溶接を行うことができる。As is clear from the above description, the seam welding device for ERW pipes of the present invention has excellent responsiveness to mechanical changes in the seam, minimizes changes in welding current, and
Since the welding temperature can be kept constant, stable welding can be performed with uniform quality.
特に、従来不可能視された低速範囲での溶接も問題なく
可能となるため、生産量の少ない設備にも簡単に応用で
きる。In particular, it is possible to weld at low speeds, which were previously considered impossible, without any problems, so it can be easily applied to equipment with low production volumes.
又、意識的に、溶接速度を高める必要がないから当該溶
接装置の規模を縮小化できる。Furthermore, since there is no need to consciously increase the welding speed, the scale of the welding apparatus can be reduced.
さらに、溶接速度の低速化が可能となるため、溶接後の
製品をさらに2次加工するような製造システムの場合、
後処理設備の能力に合せて溶接装置の能力を対応させる
ことができるので、−貫した連続製造ラインの構成も可
能となるのである。Furthermore, since it is possible to reduce the welding speed, in the case of manufacturing systems that perform secondary processing on products after welding,
Since the capacity of the welding equipment can be matched to the capacity of the post-processing equipment, it is possible to construct a continuous production line.
第1図は管の■シーム部を示す斜視図、第2図は管の振
動周期と溶接速度との関係を示すグラフ、第3図Aは誘
導溶接法の溶接装置を示す概略斜視図、第3図Bは接触
溶接法の溶接装置を示す概略斜視図、第4図は本考案の
電縫管の■シーム溶接装置の一実施例における要部を示
す斜視図、第5図は本考案の一実施例を示す回路構成図
である。
1・・・・・・管、2,2′・・・・・・縁部、3・・
・・・・ワークコイル、4・・・・・・コア、5・・・
・・・スクイズロール、6・・・・・・コンタクトチッ
プ、7・・・・・・検出コイル、8・・・・・・整流器
、9・・・・・・電圧調整器、10・・・・・・高周波
可変電源装置。Figure 1 is a perspective view showing the seam part of the pipe, Figure 2 is a graph showing the relationship between the vibration period of the pipe and the welding speed, Figure 3A is a schematic perspective view showing a welding device for induction welding, 3B is a schematic perspective view showing a welding device for the contact welding method, FIG. 4 is a perspective view showing essential parts of an embodiment of the seam welding device for electric resistance welded pipes of the present invention, and FIG. 5 is a schematic perspective view showing a welding device of the present invention. FIG. 1 is a circuit configuration diagram showing an example. 1...tube, 2,2'...edge, 3...
...Work coil, 4...Core, 5...
... Squeeze roll, 6 ... Contact tip, 7 ... Detection coil, 8 ... Rectifier, 9 ... Voltage regulator, 10 ... ...High frequency variable power supply device.
Claims (1)
ーム部を形成し、該■シーム部に高周波可変電源装置よ
り電力を供給して電気抵抗加熱により溶融温度まで加熱
し、前記両縁部を圧接して接合する溶接装置において、
前記■シーム部を流れる電流に比例した電気量を得るた
めの検出コイルを■シーム部におけるいずれか一方のエ
ツジに添って巻回して該エツジに添って設け、検出コイ
ルにて検出された電気量を電圧調整器に印加して設定値
と比較し、前記検出電気量と設定値との偏差値に応じた
信号を高周波の変電源装置に印加し、この可変電源装置
を介して前記Vシーム部を流れる電流を制御するように
構成したことを特徴とする電縫管のVシーム溶接装置。The strip material is formed into a tubular shape and its edges are brought together to form a seam part, and the seam part is heated to a melting temperature by electrical resistance heating by supplying power from a high frequency variable power supply to the seam part, and the seam parts are heated to melting temperature by electric resistance heating. In welding equipment that presses and joins
A detection coil for obtaining an amount of electricity proportional to the current flowing through the seam portion is wound along either edge of the seam portion and installed along the edge, and the amount of electricity detected by the detection coil is is applied to the voltage regulator and compared with a set value, and a signal corresponding to the deviation value between the detected amount of electricity and the set value is applied to a high frequency variable power supply device, and the V seam portion is supplied via the variable power supply device. A V-seam welding device for electric resistance welding pipes, characterized in that the device is configured to control the current flowing through the V-seam welding device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1977085636U JPS5819032Y2 (en) | 1977-06-28 | 1977-06-28 | V-seam welding equipment for ERW pipes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1977085636U JPS5819032Y2 (en) | 1977-06-28 | 1977-06-28 | V-seam welding equipment for ERW pipes |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5411917U JPS5411917U (en) | 1979-01-25 |
JPS5819032Y2 true JPS5819032Y2 (en) | 1983-04-18 |
Family
ID=29009458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1977085636U Expired JPS5819032Y2 (en) | 1977-06-28 | 1977-06-28 | V-seam welding equipment for ERW pipes |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5819032Y2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55109582A (en) * | 1979-02-16 | 1980-08-23 | Meidensha Electric Mfg Co Ltd | Heat input control method in high-frequency electric welded tube welding |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4990649A (en) * | 1972-12-29 | 1974-08-29 | ||
JPS5035821B2 (en) * | 1971-11-11 | 1975-11-19 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5630463Y2 (en) * | 1973-07-30 | 1981-07-20 |
-
1977
- 1977-06-28 JP JP1977085636U patent/JPS5819032Y2/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5035821B2 (en) * | 1971-11-11 | 1975-11-19 | ||
JPS4990649A (en) * | 1972-12-29 | 1974-08-29 |
Also Published As
Publication number | Publication date |
---|---|
JPS5411917U (en) | 1979-01-25 |
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