JPH0615447A - Manufacture of welded tube - Google Patents

Manufacture of welded tube

Info

Publication number
JPH0615447A
JPH0615447A JP19640592A JP19640592A JPH0615447A JP H0615447 A JPH0615447 A JP H0615447A JP 19640592 A JP19640592 A JP 19640592A JP 19640592 A JP19640592 A JP 19640592A JP H0615447 A JPH0615447 A JP H0615447A
Authority
JP
Japan
Prior art keywords
arc
welding
welded
wire
edge
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
Application number
JP19640592A
Other languages
Japanese (ja)
Inventor
Hiroyuki Yoshikawa
博之 吉川
Original Assignee
Sumitomo Metal Ind Ltd
住友金属工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Ind Ltd, 住友金属工業株式会社 filed Critical Sumitomo Metal Ind Ltd
Priority to JP19640592A priority Critical patent/JPH0615447A/en
Publication of JPH0615447A publication Critical patent/JPH0615447A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To attain high toughness and high corrosion resistance and to suppress the formation of welded defect such as penetrator by reforming dealloying component layer formed on a welded surface. CONSTITUTION:At the position apart from a plane included with both rotating axial centers of one pair of squeeze rolls 3, 3 by 30-70mm at the upstream side, i.e., the side of an induction heating coil 2, an arc is ignited between a wire 4b continuously supplied from a consumable electrode type gas sealed arc welder 4 and both side edge parts E, E of an open pipe OP. The oscillating frequency of a high frequency power source 6 is measured by a counter 7, and this measured data are read in a controller 5. For example, a driving part 4d for adjusting the position of the wire 4b is operated so that the standard deviation in the fluctuation of this oscillating frequency becomes 0.15% so as to ignite the arc between the edge parts E, E of the part where the gap between the edge end surfaces and the wire 4b is set in the range of 0.3-0.7mm and the wire 4b.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、金属製の帯状材をその
幅方向に湾曲して両側のエッジ部を加熱溶融しつつ衝合
溶接して製管する溶接管の製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a welded pipe in which a metal strip-shaped material is curved in the width direction thereof and is abutted and welded while the edges on both sides are heated and melted.
【0002】[0002]
【従来の技術】一般にはこの種の製管溶接法には、サブ
マージアーク溶接法、プラズマ溶接法、TIG 溶接法、高
周波電縫溶接法等があり、このうち高周波電縫溶接法は
製管溶接プロセスの中で最も高能率なプロセスとして広
く採用されている。
2. Description of the Related Art Generally, there are submerged arc welding method, plasma welding method, TIG welding method, high frequency electric resistance welding method, etc. in this type of pipe welding method. Widely adopted as the most efficient process in the process.
【0003】図4は高周波電縫溶接法による溶接管の製
造態様を示す模式図であり、金属製の帯状材をその幅方
向の両側エッジ部E,Eが相対向するように成形ロール
群(図ではシームガイドロールのみが示される)で成形
してオープンパイプOPとなした後、このオープンパイプ
OPを誘導加熱コイル2に通して両側エッジ部に高周波電
流を通じ、この部分を加熱溶融させつつスクイズロール
3により両側エッジ部E,E同士をV形状に漸近させ、
衝合溶接させて管Pを製造する。
FIG. 4 is a schematic diagram showing a manufacturing method of a welded pipe by the high frequency electric resistance welding method. A group of forming rolls ( Only the seam guide roll is shown in the figure), and after forming it into an open pipe OP, this open pipe
A high-frequency current is passed through the induction heating coil 2 to both side edge portions to heat and melt this portion, and the squeeze roll 3 makes the both side edge portions E, E asymptotically close to a V shape.
The pipe P is manufactured by butt welding.
【0004】ところでこのような高周波電縫溶接法にお
ける問題は、ペネトレータと呼ばれるエッジ部の高温酸
化により生成された酸化物が溶接面間に残留することに
より発生する溶接欠陥が多いことである。ペネトレータ
の残留は、拡管,曲げ等の溶接部に対する加工性能を劣
化させることは無論、溶接部の靱性,耐食性をも劣化さ
せ、実用上問題となることが知られている。
A problem with such a high-frequency electric resistance welding method is that there are many welding defects caused by the fact that an oxide called a penetrator, which is generated by high temperature oxidation of the edge portion, remains between the welding surfaces. It is known that the remaining penetrator deteriorates the workability of the welded portion such as pipe expansion and bending, and also deteriorates the toughness and corrosion resistance of the welded portion, which is a practical problem.
【0005】ペネトレータは、適正な溶接条件の選択に
よってある程度までは低減することが可能であるが、従
来の電縫溶接法によってはこれを皆無にすることは極め
て難しい。このため実操業においてはペネトレータの発
生しやすい材料を用いる場合、加熱部を不活性ガスでシ
ールドする方法が採用されるが、この方法でもペネトレ
ータ欠陥を完全に防止するに至っていないのが現状であ
る。
The penetrator can be reduced to some extent by selecting proper welding conditions, but it is extremely difficult to eliminate it by the conventional electric resistance welding method. For this reason, in actual operation, when using a material that easily causes a penetrator, a method of shielding the heating part with an inert gas is adopted, but even this method has not yet completely prevented the defect of the penetrator. .
【0006】このようなペネトレータの発生を防止する
従来の技術としては、例えば特開昭56-168981 号に開示
された技術がある。この方法は高周波電流による第1の
加熱手段によってエッジ部を溶融温度又はその近傍の温
度まで加熱し、次いで第2の加熱手段によってエッジ部
を溶融温度以上の温度に加熱して衝合溶接する方法であ
る。また特公昭51-33512号公報には電縫溶接とプラズマ
溶接とを組み合わせて衝合溶接する方法が開示されてい
る。
As a conventional technique for preventing the occurrence of such a penetrator, for example, there is a technique disclosed in Japanese Patent Laid-Open No. 56-168981. According to this method, the edge portion is heated to a melting temperature or a temperature in the vicinity thereof by the first heating means using a high frequency current, and then the edge portion is heated to a temperature equal to or higher than the melting temperature by the second heating means to perform abutting welding. Is. Japanese Patent Publication No. 51-33512 discloses a method of butt welding by combining electric resistance welding and plasma welding.
【0007】しかしながらこれら従来の方法にあって
は、溶融溶接法が単に溶接部を加熱溶融させるための手
段として用いられているため、一般の電縫溶接と同様に
溶接面間にフェライトバンドと呼ばれる厚さ数百μm の
脱合金成分層が生成され、溶接部の靱性,耐食性能等を
母材と同等にすることは困難である。
However, in these conventional methods, the fusion welding method is used only as a means for heating and melting the welded portion, and is therefore referred to as a ferrite band between the welding surfaces, as in general electric resistance welding. A dealloying component layer with a thickness of several hundred μm is generated, and it is difficult to make the toughness and corrosion resistance of the welded part equivalent to the base metal.
【0008】この対策として、特開昭63-220977 号に開
示されたオープンパイプの両側エッジを高周波電流によ
って加熱し、逆極性の消耗電極式ガスシールドアーク溶
接法により電極と両側エッジ部との間に埋もれアークを
点弧させつつ衝合溶接を行う方法がある。
As a countermeasure against this, both edges of the open pipe disclosed in Japanese Patent Laid-Open No. 63-220977 are heated by a high frequency electric current, and a gap between the electrode and both edges is consumed by a consumable electrode type gas shield arc welding method of opposite polarity. There is a method of performing butt welding while igniting an arc that is buried in.
【0009】[0009]
【発明が解決しようとする課題】しかしながらこの従来
方法ではアークを点弧する位置直下のエッジ端面間のギ
ャップが溶接品質を左右する重要な因子となるため、従
来にあっては静止非溶接状態でのエッジ端面間ギャップ
から溶接時のアーク直下のエッジ端面間ギャップを推定
し、或いは実際の溶接中に溶接部上方から写真撮影を行
って適正位置を求めて管長手方向のアーク位置を設定し
ているが、実際の製造過程では電縫溶接されるエッジ部
のV字形状がパイプ外径、肉厚、材質或いは溶接速度等
によって種々異なるため、その都度製管作業を中断し、
適正位置を確認する必要があり、稼働率,歩留を低下さ
せるのみならず、コイル幅,材料板厚等の僅かな変動に
よって生ずる形状変化に追従できないため十分な効果が
得られないという問題があった。
However, in this conventional method, the gap between the edge faces directly below the position where the arc is ignited is an important factor that determines the welding quality. Estimate the gap between the edge faces directly below the arc during welding from the gap between the edge faces of the weld, or take the photograph from above the weld during actual welding to find the proper position and set the arc position in the longitudinal direction of the pipe. However, in the actual manufacturing process, the V-shape of the edge part to be electric resistance welded varies depending on the pipe outer diameter, wall thickness, material, welding speed, etc.
It is necessary to check the proper position, not only lowering the operation rate and yield, but also not being able to follow the shape change caused by a slight change in the coil width, material plate thickness, etc. there were.
【0010】例えば、アーク直下のエッジ端面間ギャッ
プが適正値より狭い場合はペネトレータの発生防止効
果、電縫溶接部特有の脱合金成分層の改質が困難とな
り、また逆に広い場合は高周波電流によって加熱,溶融
したエッジ端面溶融金属のオープンパイプ内外面への押
出しを助長するため、衝合溶接時におけるアップセット
力の大幅な低下を招き、加熱によって端面に生成した酸
化物の排出が不十分となって溶接品質の確保が困難とな
る。
For example, when the gap between the edge faces directly under the arc is narrower than an appropriate value, it is difficult to prevent penetration of the penetrator, and it is difficult to modify the dealloying component layer peculiar to the electric resistance welded portion. The heated and melted edge end surface promotes the extrusion of molten metal to the inside and outside surfaces of the open pipe, resulting in a significant decrease in the upset force during butt welding, and insufficient discharge of oxides generated on the end surface due to heating. It becomes difficult to secure the welding quality.
【0011】本発明者はアーク点弧直下におけるエッジ
端面間ギャップを正確に検出すべく実験,研究を行った
結果、エッジ端面間ギャップは高周波発振周波数の変動
量と密接な関係にあることを知見した。
The present inventor has conducted experiments and researches to accurately detect the gap between the edge faces directly under the arc ignition, and as a result, found that the gap between the edge faces is closely related to the fluctuation amount of the high frequency oscillation frequency. did.
【0012】一般に溶接管の製造に用いられる高周波電
源の発振周波数は負荷インピーダンスがその変動要因で
ある。負荷インピーダンスは発振回路内の負荷及び溶接
管に流れる高周波電流経路の負荷に大別される。ここで
発振回路内の負荷は一定であるので発振周波数の変動の
要因は溶接管側にあると考えられる。ところが溶接する
溶接管サイズが一定であれば基本的に高周波電流経路は
一定であるため発振周波数の変動は起こらない。
Generally, the load impedance is a factor of fluctuation in the oscillation frequency of the high frequency power source used for manufacturing welded pipes. The load impedance is roughly classified into a load in the oscillation circuit and a load in the high frequency current path flowing in the welded pipe. Here, since the load in the oscillation circuit is constant, it is considered that the cause of the oscillation frequency fluctuation is on the welded pipe side. However, if the size of the welded pipe to be welded is constant, the oscillation frequency does not fluctuate because the high-frequency current path is basically constant.
【0013】しかしながら実際には以下のような原因で
発振周波数は変動する。即ち、消耗電極式アーク溶接法
においてはアークによって溶融したワイヤ溶融金属がエ
ッジ端面間へ供給され両エッジ間を一時的に短絡するた
め、本来衝合溶接点Oを経由して流れる高周波電流の流
通経路が短くなりインピーダンスが減少する。従って発
振周波数は増加する。
However, the oscillation frequency actually fluctuates due to the following causes. That is, in the consumable electrode type arc welding method, the wire molten metal melted by the arc is supplied to between the end faces of the edges to temporarily short-circuit both edges, so that the high frequency current flowing originally through the abutting welding point O flows. The path is shortened and the impedance is reduced. Therefore, the oscillation frequency increases.
【0014】そこで本発明者はこの短絡に着目し研究の
結果、以下のような知見を得た。アーク点弧位置直下、
即ち溶融金属の添加位置におけるエッジ端面間ギャップ
が広い場合、ワイヤ溶融金属は被溶接位置に添加されず
オープンパイプOP内面側へ達するためエッジ間短絡は生
じず高周波電流経路変化に起因する発振周波数変動量は
小さい。逆にエッジ端面間ギャップが狭い場合、即ち衝
合溶接点Oに近い場合は、この短絡が生じても電流経路
の変化量は小さく、従って発振周波数変動量も小さい。
Therefore, the present inventor has paid attention to this short circuit and, as a result of research, has obtained the following knowledge. Directly below the arc position,
That is, when the gap between the edge and end faces at the position where the molten metal is added is wide, the molten metal wire is not added to the position to be welded and reaches the inner surface of the open pipe OP, so a short circuit between edges does not occur, and oscillation frequency fluctuations caused by changes in the high frequency current path occur. The quantity is small. On the contrary, when the gap between the edge faces is narrow, that is, when the gap is close to the abutting welding point O, the amount of change in the current path is small even if this short circuit occurs, and thus the amount of oscillation frequency fluctuation is also small.
【0015】このように溶接に用いる高周波電源の発振
周波数の変動頻度及び変動量を監視しておけば、適正位
置でアークを点弧しているか否かを知ることが可能であ
る。本発明は斯かる知見に基づいてなされたものであ
り、製管中のアーク点弧位置を高周波電源の発振周波数
の変動量にて監視し、この結果に基づいてアーク溶接電
極を移動させて適正位置へ設定することにより、欠陥発
生防止効果及び脱合金成分層改質効果を安定して得るこ
とのできる溶接管の製造方法を提供することを目的とす
る。
By monitoring the variation frequency and variation amount of the oscillation frequency of the high frequency power source used for welding in this way, it is possible to know whether or not the arc is ignited at the proper position. The present invention has been made based on such knowledge, and monitors the arc ignition position during pipe manufacturing by the amount of fluctuation of the oscillation frequency of the high frequency power source, and based on this result, moves the arc welding electrode appropriately. It is an object of the present invention to provide a method for manufacturing a welded pipe which can stably obtain the defect generation preventing effect and the dealloying component layer modifying effect by setting the position to the position.
【0016】[0016]
【課題を解決するための手段】本発明に係る溶接管の製
造方法は、オープンパイプの相対向する両側のエッジ部
を高周波電流にて加熱溶融させ、前記両側のエッジ部と
これと対向させた消耗電極式ガスシールドアーク溶接機
から供給される消耗電極との間にアークを点弧させつつ
スクイズロールにて両側のエッジ部を衝合溶接する溶接
管の製造方法において、前記高周波電流を発する高周波
電源の発振周波数変動量を検出し、この検出結果に基づ
いて前記エッジ部に対する前記消耗電極の位置を監視変
更することを特徴とする。
In the method for manufacturing a welded pipe according to the present invention, the edge portions on both sides of the open pipe facing each other are heated and melted by a high frequency current, and the edge portions on both sides are opposed to the edge portions. In a method for manufacturing a welded pipe in which the edges on both sides are butt-welded with a squeeze roll while igniting an arc with a consumable electrode supplied from a consumable electrode type gas shielded arc welder, a high frequency wave that emits the high frequency current It is characterized in that the fluctuation amount of the oscillation frequency of the power supply is detected, and the position of the consumable electrode with respect to the edge portion is monitored and changed based on the detection result.
【0017】[0017]
【作用】本発明にあってはオープンパイプのエッジ部と
の間にアークの点弧を行わせるべき消耗電極の位置を高
周波電源の発振周波数の変動量に基づいて監視変更する
ので、位置の適否を容易にしかも正確に認識することが
可能となる。そしてこの値に基づいてアーク点弧位置を
制御するので、大きな脱合金成分層改質効果,溶接欠陥
発生防止効果が得られる。
According to the present invention, the position of the consumable electrode which should be ignited with the edge of the open pipe is monitored and changed based on the fluctuation amount of the oscillation frequency of the high frequency power source. Can be recognized easily and accurately. Since the arc ignition position is controlled based on this value, a large dealloying component layer reforming effect and a welding defect generation preventing effect can be obtained.
【0018】[0018]
【実施例】以下本発明をその実施状態を示す図面に基づ
いて具体的に説明する。図1は本発明に係る溶接管の製
造方法 (以下本発明方法という) の実施状態を示す模式
的側面図、図2は同じくその模式的平面図であり、図中
OPはオープンパイプ、Pは管、1はシームガイドロー
ル、2は誘導加熱コイル、3はスクイズロール、4は消
耗電極式ガスシールドアーク溶接機、5は制御装置、6
は高周波電源、7はカウンタを示している。オープンパ
イプOPはスケルプを成形ロール群 (最終段のシームガイ
ドロール1のみを示す) に適用して両側エッジ部E,E
が断面U形から相対向する断面略O形に迄曲成されてい
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic side view showing an implementation state of a method for manufacturing a welded pipe according to the present invention (hereinafter referred to as a method of the present invention), and FIG. 2 is a schematic plan view of the same.
OP is an open pipe, P is a pipe, 1 is a seam guide roll, 2 is an induction heating coil, 3 is a squeeze roll, 4 is a consumable electrode type gas shield arc welder, 5 is a controller, 6
Is a high frequency power supply, and 7 is a counter. For open pipe OP, skelp is applied to the forming roll group (only the seam guide roll 1 at the final stage is shown), and both side edges E, E
Is bent from a U-shaped section to a substantially O-shaped section facing each other.
【0019】このオープンパイプOPはシームガイドロー
ル1を出た後、誘導加熱コイル2に通されて両側エッジ
部E,Eを加熱させつつスクイズロール3側に向かうに
従って両側エッジ端面E,Eが相互にV形状に漸近せし
められ、スクイズロール3にてアップセットをかけら
れ、溶接点Oにて相互に衝合溶接され、管Pの状態とな
って仕上工程に向け矢符方向に移送されてゆく。
After the seam guide roll 1 exits the open pipe OP, it is passed through an induction heating coil 2 to heat both side edge portions E, E, and both side edge end faces E, E are mutually moved toward the squeeze roll 3 side. Are asymptotically V-shaped, upset by the squeeze roll 3, butt-welded to each other at the welding point O, and transferred to the finishing process in the arrow direction toward the finishing process. .
【0020】消耗電極式ガスシールドアーク溶接機4は
所定のワイヤ送給装置を備えると共に溶接電源(図示せ
ず)に接続された溶接トーチ4aを備えており、該溶接ト
ーチ4aを通じてリール4cから消耗電極たるワイヤ4bを引
出し、オープンパイプOPの相対するエッジ部E,Eがス
クイズロール3によって衝合溶接される地点、即ち溶接
点Oと誘導加熱コイル2との間におけるエッジ部E,E
とワイヤ4bとの間にアークを点弧させてこれを溶融させ
つつ供給してゆくようになっている。
The consumable electrode type gas shielded arc welding machine 4 is provided with a predetermined wire feeding device and a welding torch 4a connected to a welding power source (not shown), and the reel 4c is consumed through the welding torch 4a. The wire 4b serving as the electrode is pulled out, and the opposite edge portions E, E of the open pipe OP are abutting welded by the squeeze roll 3, that is, the edge portions E, E between the welding point O and the induction heating coil 2.
An arc is ignited between the wire and the wire 4b to melt and supply the arc.
【0021】またこの消耗電極式ガスシールドアーク溶
接機4には、エッジ部E,Eと対向させたワイヤ4bの位
置をオープンパイプOPの管軸方向に移動調節するための
駆動部4dを備えており、該駆動部4dの操作により一対の
スクイズロール3,3の両回転軸心を含む平面から誘導
加熱コイル2の側に向けて例えば30mm〜70mmの範囲内、
望ましくは40〜50mmの範囲内でエッジ部E,Eに対する
ワイヤ4bの位置を前、後方向に移動調節するようになっ
ている。
Further, the consumable electrode type gas shield arc welding machine 4 is provided with a drive unit 4d for moving and adjusting the position of the wire 4b opposed to the edge portions E, E in the pipe axis direction of the open pipe OP. By operating the drive unit 4d toward the side of the induction heating coil 2 from the plane including both rotation axes of the pair of squeeze rolls 3, 3 within a range of, for example, 30 mm to 70 mm,
Desirably, the position of the wire 4b with respect to the edge portions E, E is moved and adjusted in the forward and backward directions within a range of 40 to 50 mm.
【0022】カウンタ7は誘導加熱コイル2の高周波電
源6における真空管プレート側の高周波電圧周波数を例
えば0.5msec.毎に測定する。制御装置5はこの測定デー
タを読み込み周波数変動量及びその標準偏差を求める。
そしてこの標準偏差が例えば0.15%となるよう、換言す
れば両側エッジ端面間ギャップが0.3 〜0.7mm の範囲内
において点弧を行わせるべく駆動部4dに制御信号を出力
し、溶接トーチ4aの位置調節を行うようになっている。
そしてこの調節位置でアークを点弧し、連続供給される
ワイヤ4bを溶融させ、その溶融金属を被溶接面に添加し
つつスクイズロール3にて衝合溶接を行って溶接管Pを
得るべく監視及び制御を行う。
The counter 7 measures the high frequency voltage frequency of the high frequency power source 6 of the induction heating coil 2 on the side of the vacuum tube plate, for example, every 0.5 msec. The control device 5 reads this measurement data and obtains the frequency fluctuation amount and its standard deviation.
Then, a control signal is output to the drive unit 4d so that the standard deviation becomes, for example, 0.15%, in other words, the ignition is performed within the gap between the edge surfaces on both sides of 0.3 to 0.7 mm, and the position of the welding torch 4a is changed. It is designed to make adjustments.
Then, the arc is ignited at this adjusting position to melt the continuously supplied wire 4b, and the molten metal is added to the surface to be welded, and the squeeze roll 3 is used for abutting welding to monitor to obtain a welded pipe P. And control.
【0023】このような監視方法を採用することによ
り、アーク点弧直下のエッジ端面間ギャップが狭すぎる
ことによる被溶接面へのワイヤ溶融金属の添加不足、即
ちペネトレータ発生防止効果の不十分さ、或いは逆に広
すぎてエッジ部過加熱による溶融金属のオープンパイプ
内外面への押し出しを助長しアップセット力低下に起因
する割れ発生を確実に避けることが可能となる。
By adopting such a monitoring method, insufficient addition of the molten metal to the surface to be welded due to the gap between the edge faces directly below the arc ignition is too narrow, that is, the effect of preventing penetration of the penetrator is insufficient, On the contrary, it is too wide to promote the extruding of the molten metal to the inner and outer surfaces of the open pipe due to overheating of the edge portion, and it is possible to surely avoid the occurrence of cracks due to the decrease in the upsetting force.
【0024】(試験例)C:0.07%、Si:0.23%、Mn:
1.30%、Nb:0.066 %、Ti:0.046 %を含有する帯鋼か
ら外径50.8mm、肉厚4.9mm の電縫鋼管を製造した。製造
に際しては誘導加熱コイル2と衝合溶接点Oとの間に配
置された消耗電極式ガスシールドアーク溶接機4にて
C:0.19%、Si:0.23%、Mn:2.09%、Nb:0.066 %、
Ti:0.046%を含有する直径1.2mm のワイヤを連続的に
溶融させ、その溶融金属をオープンパイプOPの被溶接面
へ添加した。アークの点弧位置は、一対のスクイズロー
ル3,3の両回転軸心を含む平面から誘導加熱コイル2
の方向へ30mm〜70mm隔てたオープンパイプの上方とし
た。なお消耗電極式ガスシールドアーク溶接機4おける
溶接電源の電流,電圧は夫々300A,30V とし、シールド
ガスとして99.999%の純度のArを用いた。
(Test Example) C: 0.07%, Si: 0.23%, Mn:
ERW steel pipe with an outer diameter of 50.8 mm and a wall thickness of 4.9 mm was manufactured from a strip steel containing 1.30%, Nb: 0.066%, Ti: 0.046%. At the time of manufacture, C: 0.19%, Si: 0.23%, Mn: 2.09%, Nb: 0.066% with a consumable electrode type gas shield arc welder 4 placed between the induction heating coil 2 and the abutting welding point O. ,
A 1.2 mm diameter wire containing Ti: 0.046% was continuously melted, and the molten metal was added to the welded surface of the open pipe OP. The ignition position of the arc is the induction heating coil 2 from a plane including both rotation axes of the pair of squeeze rolls 3 and 3.
It was above the open pipe 30 to 70 mm apart in the direction of. The current and voltage of the welding power source in the consumable electrode type gas shield arc welder 4 were 300 A and 30 V, respectively, and 99.999% pure Ar was used as the shield gas.
【0025】以上の溶接条件にて製管を行ったときのア
ーク点弧位置 (一対のスクイズロール3,3の両回転軸
心を含む平面からの距離) と、衝合溶接点上方から写真
撮影によって測定したエッジ端面間ギャップと、製管中
に測定した高周波電源6の発振周波数変動量及び溶接後
の偏平試験によって判定した管1m 当たりの溶接欠陥長
さとの関係を図3に示す。
Arc firing position (distance from the plane including both rotation axes of the pair of squeeze rolls 3 and 3) when the pipe was produced under the above welding conditions, and a photograph was taken from above the abutting weld point. Fig. 3 shows the relationship between the edge-to-end face gap measured by the method, the oscillation frequency fluctuation amount of the high-frequency power source 6 measured during pipe manufacturing, and the welding defect length per 1 m of the pipe determined by the flattening test after welding.
【0026】図3は横軸にスクイズロールの中心と対応
する位置から誘導加熱コイル2側に測った距離mmを、ま
た縦軸にエッジ端面ギャップmm〔図3(a)〕、発振周波
数変動量の標準偏差%〔図3 (b)〕、溶接欠陥長さmm/
m〔図3(c)〕をとって示してある。
In FIG. 3, the horizontal axis indicates the distance mm measured from the position corresponding to the center of the squeeze roll to the induction heating coil 2 side, and the vertical axis indicates the edge end face gap mm [FIG. 3 (a)], the oscillation frequency fluctuation amount. Standard deviation% [Fig. 3 (b)], welding defect length mm /
m [Fig. 3 (c)].
【0027】アーク点弧位置を一対のスクイズロール
3,3の両回転軸心を含む平面から40mm以上50mm以下、
エッジ端面間ギャップは0.3mm 以上0.7mm 以下、発振周
波数変動量の標準偏差は0.15%前後の各範囲に保持する
ことで溶接後の偏平試験によって認められる溶接欠陥の
長さを大幅に縮小し得ることが解る。
The arc firing position is 40 mm or more and 50 mm or less from the plane including both rotation axes of the pair of squeeze rolls 3, 3.
By maintaining the gap between the edge faces of 0.3 mm or more and 0.7 mm or less and the standard deviation of the oscillation frequency fluctuation amount in each range of around 0.15%, the length of the welding defect recognized by the flatness test after welding can be significantly reduced. I understand.
【0028】また図3(b),図3(c) とから明らかな如く
発振周波数変動量の標準偏差と溶接欠陥長さとの間には
密接な相関関係があることから、発振周波数変動量の標
準偏差を監視することにより、溶接欠陥長さを縮小する
アークの適正点弧位置を判定し得ることが解かる。
Further, as is clear from FIGS. 3 (b) and 3 (c), there is a close correlation between the standard deviation of the oscillation frequency fluctuation amount and the welding defect length. It is understood that by monitoring the standard deviation, the proper ignition position of the arc that reduces the welding defect length can be determined.
【0029】なお、図3に示した本実施例は監視パラメ
ータとして発振周波数変動量の標準偏差を用いたが、多
の周波数測定データ処理方法、すなわちエッジ端面間ギ
ャップが狭い場合には発振周波数の変動量が小さく、又
広い場合には発振周波数の変動頻度が少なくなることを
考慮したパラメータによる監視を行っても同様の結果が
得られる。また、誘導加熱コイルにかえてコンタクトチ
ップによる直接通電においても同様の効果が得られる。
なお、最適アーク点弧位置、換言すればエッジ端面間ギ
ャップ最適値は製管仕様条件により適宜決定すればよ
い。
The present embodiment shown in FIG. 3 uses the standard deviation of the oscillation frequency fluctuation amount as the monitoring parameter. However, in the case of many frequency measurement data processing methods, that is, when the gap between the edge faces is narrow, the oscillation frequency Similar results can be obtained by monitoring with a parameter considering that the fluctuation frequency of the oscillation frequency decreases when the fluctuation amount is small or wide. Further, the same effect can be obtained when the contact tip is directly energized instead of the induction heating coil.
The optimum arc firing position, in other words, the optimum value of the gap between the end faces of the edges may be appropriately determined according to the pipe manufacturing specification conditions.
【0030】[0030]
【発明の効果】以上の如く本発明方法にあっては、製管
中、アーク点弧位置の適否を正確に把握することが出来
て、最適位置での安定したアーク点弧が可能となり、ペ
ネトレータ等の溶接欠陥の発生を抑制出来、しかも脱合
金成分層の改質も可能となって高靱性、高耐食性を備え
た溶接管の製造が可能となる等本発明は優れた効果を奏
するものである。
As described above, according to the method of the present invention, the appropriateness of the arc ignition position can be accurately grasped during the pipe manufacturing, and the stable arc ignition can be performed at the optimum position. It is possible to suppress the occurrence of welding defects such as, moreover, it is also possible to modify the dealloying component layer, it is possible to manufacture a welded pipe having high toughness, high corrosion resistance, etc. The present invention has excellent effects is there.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明方法の実施状態を示す模式的側面図であ
る。
FIG. 1 is a schematic side view showing an implementation state of a method of the present invention.
【図2】本発明方法の実施状態を示す模式的平面図であ
る。
FIG. 2 is a schematic plan view showing an implementation state of the method of the present invention.
【図3】本発明方法の試験結果を示すグラフである。FIG. 3 is a graph showing the test results of the method of the present invention.
【図4】従来方法の実施状態を示す模式的平面図であ
る。
FIG. 4 is a schematic plan view showing an implementation state of a conventional method.
【符号の説明】[Explanation of symbols]
OP オープンパイプ P 管 E エッジ部 1 シームガイドロール 2 誘導加熱コイル 3 スクイズロール 4 消耗電極式ガスシールドアーク溶接機 4a 溶接トーチ 4b ワイヤ 4c リール 4d モータ 5 制御装置 6 高周波電源 7 カウンタ OP Open pipe P pipe E Edge part 1 Seam guide roll 2 Induction heating coil 3 Squeeze roll 4 Consumable electrode type gas shield arc welder 4a Welding torch 4b Wire 4c Reel 4d Motor 5 Control device 6 High frequency power supply 7 Counter

Claims (1)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 オープンパイプの相対向する両側のエッ
    ジ部を高周波電流にて加熱溶融させ、前記両側のエッジ
    部とこれと対向させた消耗電極式ガスシールドアーク溶
    接機から供給される消耗電極との間にアークを点弧させ
    つつスクイズロールにて両側のエッジ部を衝合溶接する
    溶接管の製造方法において、前記高周波電流を発する高
    周波電源の発振周波数変動量を検出し、この検出結果に
    基づいて前記エッジ部に対する前記消耗電極の位置を監
    視変更することを特徴とする溶接管の製造方法。
    1. An open pipe is provided with a consumable electrode supplied from a consumable electrode type gas shielded arc welding machine, which is heated and melted at opposite side edges by a high-frequency current, and the opposite side edge portions are opposed to each other. In a method of manufacturing a welded pipe in which both edges are butt-welded with a squeeze roll while igniting an arc between, the oscillation frequency fluctuation amount of the high frequency power source that emits the high frequency current is detected, and based on this detection result A method for manufacturing a welded pipe, wherein the position of the consumable electrode with respect to the edge portion is monitored and changed.
JP19640592A 1992-06-29 1992-06-29 Manufacture of welded tube Pending JPH0615447A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19640592A JPH0615447A (en) 1992-06-29 1992-06-29 Manufacture of welded tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19640592A JPH0615447A (en) 1992-06-29 1992-06-29 Manufacture of welded tube

Publications (1)

Publication Number Publication Date
JPH0615447A true JPH0615447A (en) 1994-01-25

Family

ID=16357318

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19640592A Pending JPH0615447A (en) 1992-06-29 1992-06-29 Manufacture of welded tube

Country Status (1)

Country Link
JP (1) JPH0615447A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100849216B1 (en) * 2006-12-18 2008-07-31 주식회사 위스코 0-die extruding type pipe coating check device
KR100849217B1 (en) * 2006-12-18 2008-07-31 주식회사 위스코 T-die extruding type pipe coating check device
US20110284527A1 (en) * 2010-05-21 2011-11-24 Illinois Tool Works Inc. Auxiliary welding heating system
EP3049209B1 (en) * 2013-09-25 2017-09-20 Illinois Tool Works Inc. Metal heating and working system and method with heating and/or cooling using an induction heating head
CN107570900A (en) * 2017-09-27 2018-01-12 北京科技大学 A kind of hf electric arc complex welding method
US9913320B2 (en) 2014-05-16 2018-03-06 Illinois Tool Works Inc. Induction heating system travel sensor assembly
US10244588B2 (en) 2014-10-14 2019-03-26 Illinois Tool Works Inc. Hybrid induction heating/welding assembly
US10462853B2 (en) 2013-05-28 2019-10-29 Illinois Tool Works Inc. Induction pre-heating and butt welding device for adjacent edges of at least one element to be welded
US10638554B2 (en) 2014-12-23 2020-04-28 Illinois Tool Works Inc. Systems and methods for interchangeable induction heating systems
US10863591B2 (en) 2014-05-16 2020-12-08 Illinois Tool Works Inc. Induction heating stand assembly
US11076454B2 (en) 2014-05-16 2021-07-27 Illinois Tool Works Inc. Induction heating system temperature sensor assembly

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100849216B1 (en) * 2006-12-18 2008-07-31 주식회사 위스코 0-die extruding type pipe coating check device
KR100849217B1 (en) * 2006-12-18 2008-07-31 주식회사 위스코 T-die extruding type pipe coating check device
US20110284527A1 (en) * 2010-05-21 2011-11-24 Illinois Tool Works Inc. Auxiliary welding heating system
US11072035B2 (en) * 2010-05-21 2021-07-27 Illinois Tool Works Inc. Auxiliary welding heating system
US10462853B2 (en) 2013-05-28 2019-10-29 Illinois Tool Works Inc. Induction pre-heating and butt welding device for adjacent edges of at least one element to be welded
EP3049209B1 (en) * 2013-09-25 2017-09-20 Illinois Tool Works Inc. Metal heating and working system and method with heating and/or cooling using an induction heating head
US10863591B2 (en) 2014-05-16 2020-12-08 Illinois Tool Works Inc. Induction heating stand assembly
US9913320B2 (en) 2014-05-16 2018-03-06 Illinois Tool Works Inc. Induction heating system travel sensor assembly
US11076454B2 (en) 2014-05-16 2021-07-27 Illinois Tool Works Inc. Induction heating system temperature sensor assembly
US10440784B2 (en) 2014-10-14 2019-10-08 Illinois Tool Works Inc. Reduced-distortion hybrid induction heating/welding assembly
US10244588B2 (en) 2014-10-14 2019-03-26 Illinois Tool Works Inc. Hybrid induction heating/welding assembly
US10638554B2 (en) 2014-12-23 2020-04-28 Illinois Tool Works Inc. Systems and methods for interchangeable induction heating systems
CN107570900A (en) * 2017-09-27 2018-01-12 北京科技大学 A kind of hf electric arc complex welding method

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