JP2014231084A - Weld shield system for electroseamed steel pipe - Google Patents
Weld shield system for electroseamed steel pipe Download PDFInfo
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- 239000010959 steel Substances 0.000 title claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 118
- 238000003466 welding Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 10
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- 238000005507 spraying Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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Abstract
Description
本発明は、電縫鋼管の溶接部シールドシステムに関し、特に、油井ラインパイプ向けや自動車用の部品などの、溶接部に高い機械的特性が要求される電縫鋼管の製造に好適な電縫鋼管の溶接部シールドシステムに関する。 The present invention relates to a welded shield system for an electric resistance welded steel pipe, and more particularly to an electric resistance welded steel pipe suitable for manufacturing an electric resistance welded steel pipe that requires high mechanical properties in a welded part, such as for oil well line pipes and automotive parts. The present invention relates to a welding part shield system.
通常、鋼管は溶接鋼管と継目無鋼管に大別される。溶接鋼管は、電縫鋼管を例とするように、板（帯材の意、以下同じ）を丸めて端部を突き合わせて溶接して製造され、継目無鋼管は、材料の塊を高温で穿孔してマンドレルミル等で圧延して製造される。溶接鋼管の場合、一般に溶接部の特性は母材より劣ると云われ、鋼管の適用に当たって、用途ごとに溶接部の靭性や強度や伸びなどの保証が常に議論されて問題となってきた。 Usually, steel pipes are roughly divided into welded steel pipes and seamless steel pipes. Welded steel pipes are manufactured by rounding a plate (meaning of a strip, the same shall apply hereinafter) and welding the end parts, as in the case of ERW steel pipes. Seamless steel pipes are used to drill a lump of material at a high temperature. And it is manufactured by rolling with a mandrel mill or the like. In the case of a welded steel pipe, it is generally said that the properties of the welded part are inferior to the base metal, and in the application of the steel pipe, guarantees such as toughness, strength and elongation of the welded part have always been discussed for each application.
例えば、原油や天然ガスなどを輸送するラインパイプでは、鋼管を寒冷地に敷設することが多いため低温靭性が必要とされ、鋼管の強度が重要視される。
また、通常、鋼管の母材となる熱延鋼板は、鋼管製造後の母材特性を考慮して成分設計され、強度等の特性が確保される。
しかし、溶接部の特性は、母材の成分設計や熱処理等による以上に、電縫溶接方法によって大きく左右されるため、溶接技術の開発が重要であった。電縫溶接不良の原因としては、ペネトレータと呼ばれる酸化物主体の溶接欠陥が、電縫溶接時に被溶接部（詳しくは、帯材を丸めてなるオープン管である素管の周方向両端面を突き合わせた部位である素管エッジ突合せ部）に生成して残留し、この残留したペネトレータを原因として靭性が低下したり強度不足になったりする例が多かった。
For example, line pipes for transporting crude oil, natural gas, and the like often require low temperature toughness because steel pipes are often laid in cold regions, and the strength of steel pipes is regarded as important.
In general, a hot-rolled steel sheet, which is a base material of a steel pipe, is designed in consideration of the base material characteristics after manufacturing the steel pipe, and characteristics such as strength are ensured.
However, since the characteristics of the welded part are greatly influenced by the electric resistance welding method rather than by the base material component design, heat treatment, etc., it was important to develop a welding technique. The cause of poor ERW welding is that an oxide-based welding defect called a penetrator butts the welded parts during ERW welding (specifically, the circumferential ends of the element pipe, which is an open pipe made by rolling a band material) In many cases, the toughness is reduced or the strength is insufficient due to the residual penetrator.
そこで、従来技術として電縫溶接不良の主原因であるペネトレータを溶接部から除くため、被溶接部へのガス吹き付けにより被溶接部の酸化を防止するガスシールド溶接方法および装置が数多く提案されてきた。
例えば、特許文献１には電縫管の溶接部シールド装置において被溶接部回りの密閉空間を最小容積として被溶接部回りの酸素濃度を短時間で下げる目的で、スクイズロールのロールスタンドに被溶接部回りの溶接装置と素管の局部のみを覆うシールドカバーを取着した旨記載されている。
Therefore, in order to remove the penetrator, which is the main cause of poor ERW welding, from the welded part, many gas shield welding methods and apparatuses for preventing the welded part from being oxidized by blowing gas onto the welded part have been proposed. .
For example, in
また、特許文献２には、素管内に装入するインピーダケースに不活性ガスの液化ガス配管を配設して供給した液化ガスでインピーダコアを冷却した後当該液化ガスを溶接点に向けて噴出してガスシールドする旨記載されている。
また、特許文献３には、素管のエッジ部加熱起点から溶接点に至るまでの通管経路全域を、エッジ部加熱用誘導コイル、スクイズロール共々シールドボックスで覆い、該シールドボックス内へガス供給管にて所定流量でガスを供給する旨記載されている。
Further, in
In
しかし、溶接点付近のみを外面側から（特許文献１）或いは内面側から（特許文献２）のガス吹き付けによりガスシールドする方法は、充分にシールドができずに溶接部に酸化物が残留する場合があった。
また、素管のエッジ部加熱起点から溶接点に至るまでの通管経路全域をシールドボックスで覆う方式（特許文献３）は、装置構造が複雑であり、組み付けに多大な時間を要する事や、管の寸法が変わるごとにシールドボックスの取替えや調整が必要であり、造管コスト面および能率面での不利が大きいという問題がある。
However, the method of gas shielding only by welding the vicinity of the welding point from the outer surface side (Patent Document 1) or from the inner surface side (Patent Document 2) is not sufficient shielding, and oxide remains in the weld. was there.
In addition, the method (Patent Document 3) in which the entire pipe passage route from the edge heating start point to the welding point of the raw pipe is covered with a shield box (Patent Document 3) has a complicated apparatus structure and requires a lot of time for assembly, Each time the dimensions of the pipe change, it is necessary to replace or adjust the shield box, and there is a problem that the disadvantage in terms of pipe making cost and efficiency is great.
以上のように、従来技術では、造管コスト面さらには能率面の犠牲なしでは、電縫溶接時の被溶接部を確実にガスシールドして其処の酸素濃度を十分に低下させる事ができていないためペネトレータの生成を防止できないという課題があった。
そこで、本発明者らは、上記課題を解決する為に鋭意検討した結果、素管のエッジ部加熱起点から溶接点に至る通管範囲をシールドボックスで覆わずに、前記通管範囲内で素管の被溶接部直上から被溶接部にシールドガスを吹き付ける場合、被溶接部の上端からシールドガス吹付け用ノズルにおけるシールドガスの放出口までの高さであるノズル高さ、および吹付けるシールドガスの流速を適正に制御する事により、被溶接部の酸素濃度を十分に低減できる事を見出し、電縫鋼管の素管被溶接部シールド装置を提案した（特願２０１３−６１２７５）。
As described above, in the conventional technology, the welded part at the time of ERW welding can be surely gas shielded and the oxygen concentration can be sufficiently reduced without sacrificing the pipe making cost and the efficiency. Therefore, there is a problem that the generation of the penetrator cannot be prevented.
Therefore, as a result of intensive investigations to solve the above problems, the present inventors have found that the pipe range from the edge heating start point to the weld point of the blank pipe is not covered with a shield box, and the element within the pipe range is not covered. When spraying shield gas from directly above the welded part of the pipe to the welded part, the nozzle height, which is the height from the upper end of the welded part to the shield gas blowing nozzle in the shield gas blowing nozzle, and the shield gas to be blown It was found that the oxygen concentration in the welded part can be sufficiently reduced by appropriately controlling the flow velocity of the welded part, and an unsealed steel pipe welded part shielding device for an ERW steel pipe was proposed (Japanese Patent Application No. 2013-61275).
上記素管被溶接部シールド装置を用いることによって、電縫溶接が正常に行われた定常部では十分に高い溶接部特性が得られた。しかしながら、スパーク等の溶接不良が発生した場合に、前記素管被溶接部シールド装置が溶接部の上部に設置されているため、前記スパークを検出したり溶接入熱を制御することができないという問題が顕在化した。 By using the above-mentioned raw-tube welded part shielding device, sufficiently high welded part characteristics were obtained in a steady part where electric resistance welding was normally performed. However, when welding defects such as sparks occur, the shielded welded part shield device is installed on the upper part of the welded part, so that the spark cannot be detected or the welding heat input cannot be controlled. Became apparent.
本発明者らは、前記課題を解決する為に鋭意検討し、その結果、素管被溶接部シールド装置に透視窓を設け、適正な位置に溶接部のスパーク検出装置あるいは溶接部の監視装置を配置することにより、被溶接部の酸素濃度を十分に低減しつつ、溶接部のスパークの検出あるいは溶接部の監視ができる事を見出し、本発明を成した。即ち本発明は以下の通りである。
（１） 電縫鋼管の製造において、電縫溶接時の被溶接部を不活性ガスからなるシールドガスを上部から吹き付けてガスシールドする電縫鋼管の溶接部シールドシステムであって、
前記被溶接部に対し該被溶接部上端から５〜３００ｍｍ上方の位置にガス放出口を配位したシールドガス吹付け用ノズルと、前記ガス放出口から放出される前記シールドガスの流速を０．５〜５０ｍ／ｓに制御するガス流調整手段と、前記シールドガス吹付け用ノズルから構成される溶接部シールド装置上面にガラスまたは透明の樹脂材料からなるアスペクト比が５：１以下で面積が１００ｍｍ２以上の透視窓と、を有することを特徴とする電縫鋼管の溶接部シールドシステム。
（２） 前記ガス放出口の形状は、矩形であり通管方向成分である長さが３０ｍｍ以上、素管エッジ突合せ方向成分である幅が５ｍｍ以上であることを特徴とする（１）に記載の電縫鋼管の溶接部シールドシステム。
（３） 前記素管エッジ突合せ方向成分である幅Ｒは、前記ガス放出口の直下の被溶接部の端面間の最大間隔Ｗに対し、Ｒ／Ｗ＞１．０、なる関係を満たすことを特徴とする（１）または（２）に記載の電縫鋼管の溶接部シールドシステム。
（４） 前記不活性ガスに代えて、還元性ガスを０．１質量％以上含有するガスとしたことを特徴とする（１）〜（３）の何れかに記載の電縫鋼管の溶接部シールドシステム。
（５） （１）〜（４）の何れかに記載の電縫鋼管の溶接部シールドシステムに加えて、前記透視窓の上方５ｍ以内で前記透視窓の鉛直方向となす角度が４５度の範囲内に溶接部監視用の高速度カメラを配置したことを特徴とする電縫鋼管の溶接部シールドシステム。
（６） （１）〜（４）の何れかに記載の電縫鋼管の溶接部シールドシステムに加えて、前記透視窓の上方５ｍ以内で前記透視窓の鉛直方向となす角度が４５度の範囲内に溶接部のスパーク検出用のカメラを配置したことを特徴とする電縫鋼管の溶接部シールドシステム。
（７） （１）〜（４）の何れかに記載の電縫鋼管の溶接部シールドシステムに加えて、前記透視窓の上方５ｍ以内で前記透視窓の鉛直方向となす角度が４５度の範囲内に溶接部監視用の高速度カメラおよびスパーク検出用のカメラを配置したことを特徴とする電縫鋼管の溶接部シールドシステム。
（８） （１）〜（７）の何れかに記載の溶接部シールドシステムを用いて製造される電縫溶接鋼管。
The present inventors have intensively studied to solve the above-mentioned problems. As a result, a transparent window is provided in the shielded welded part of the raw tube welded part, and a spark detection device for the welded part or a welded part monitoring device is provided at an appropriate position. As a result of the arrangement, the present inventors have found that it is possible to detect the spark of the welded part or monitor the welded part while sufficiently reducing the oxygen concentration of the welded part. That is, the present invention is as follows.
(1) In the manufacture of an electric resistance welded pipe, a welded part shield system for an electric resistance welded pipe in which a shield gas made of an inert gas is blown from above to weld a welded part at the time of electric resistance welding,
A shield gas blowing nozzle in which a gas discharge port is arranged at a
(2) The shape of the gas discharge port is a rectangle, a length that is a component in the tube passage direction is 30 mm or more, and a width that is a component in the raw tube edge butting direction is 5 mm or more. ERW steel pipe weld shield system.
(3) The width R, which is a component of the raw tube edge butting direction, satisfies the relationship of R / W> 1.0 with respect to the maximum interval W between the end faces of the welded portion immediately below the gas discharge port. The welded part shield system for an electric resistance welded steel pipe according to (1) or (2).
(4) The welded portion of the ERW steel pipe according to any one of (1) to (3), wherein the gas contains 0.1% by mass or more of a reducing gas instead of the inert gas. Shield system.
(5) In addition to the welded part shield system for an electric resistance welded steel pipe according to any one of (1) to (4), an angle formed with the vertical direction of the fluoroscopic window within 45 m above the fluoroscopic window is in a range of 45 degrees. A welded shield system for ERW steel pipes, which is equipped with a high-speed camera for monitoring welds.
(6) In addition to the welded part shield system for an electric resistance welded steel pipe according to any one of (1) to (4), an angle formed with the vertical direction of the fluoroscopic window within 45 m above the fluoroscopic window is within a range of 45 degrees. A welded shield system for welded steel pipes, characterized in that a camera for detecting sparks in the welded parts is arranged inside.
(7) In addition to the welded part shield system for an electric resistance welded steel pipe according to any one of (1) to (4), an angle formed with the vertical direction of the fluoroscopic window within 45 m above the fluoroscopic window is within a range of 45 degrees. A welded shield system for an ERW steel pipe, characterized in that a high-speed camera for monitoring the welded part and a camera for detecting the spark are arranged therein.
(8) An electric resistance welded steel pipe manufactured using the welded part shield system according to any one of (1) to (7).
本発明による電縫鋼管の溶接部シールドシステムは、電縫溶接時の被溶接部の酸素濃度を十分低いレベルに維持でき、かつ、溶接部のスパークの検出あるいは溶接現象の監視をすることができ、電縫鋼管の溶接部特性を確実に従来レベルよりも向上させる事ができる。 The welded part shielding system for ERW steel pipe according to the present invention can maintain the oxygen concentration of the welded part at the time of ERW welding at a sufficiently low level, and can detect the spark of the welded part or monitor the welding phenomenon. In addition, the welded portion characteristics of the ERW steel pipe can be reliably improved from the conventional level.
図１は、本発明の実施形態を示す概略図である。鋼帯からなる帯材を図示しないアンコイラーで連続的に払出し、図示しないレベラーで矯正し、通管方向２０に送りつつ、図示しないロール成形機で帯材の幅を丸めて素管（オープン管）１０となし、該丸めた幅の両端面を突合せてなる素管エッジ突合せ部である被溶接部１１を電縫溶接機（図示しないエッジ部加熱用給電手段と図示しない圧接用スクイズロールとで構成されている）により、電縫溶接して、電縫鋼管１５を得る。１２は素管エッジ部加熱起点、１３は前記圧接により被溶接部１１が接合する通管方向位置を指す溶接点である。尚、素管１０乃至電縫鋼管１５の管内面側にはインピーダ（図示省略）を配置する場合もある。電縫溶接機を出た電縫鋼管１５は図示しないサイザーで外径調整をされる。
FIG. 1 is a schematic view showing an embodiment of the present invention. A strip made of steel strip is continuously paid out with an uncoiler (not shown), corrected with a leveler (not shown), and sent in the
本発明では、素管エッジ部加熱起点１２から溶接点１３までの通管方向範囲の全域、或いは当該範囲内の、被溶接部に酸化物が生成し易い区域（この区域は予備調査により特定できる）をシールド範囲とし、該シールド範囲において、被溶接部１１の直上の位置にシールドガス吹付け用ノズル（略してノズル）１を配置する。
ノズル１は、其のガス放出口１Ａを被溶接部１１上端と正対する様に配位して、配置される。
In the present invention, the entire range of the pipe passage direction from the raw tube edge
The
本発明者らはシールドガスの流れについて詳細に観察した。さらに、ガス放出口１Ａの位置や寸法、ならびにガス放出口１Ａでのシールドガスの流速などの、様々なシールドガスの吹付け条件が、電縫溶接時の被溶接部１１の酸素濃度と、該被溶接部を電縫溶接してなる溶接部における酸化物の面積率とに及ぼす影響を詳細に調査した。
その結果、シールドガスの吹付け条件を最適にする事により、被溶接部の酸素濃度が０．０１質量％以下になり、溶接部の酸化物面積率が０．１％以下になることを発見した。ここで、溶接部の酸化物面積率とは、次のとおり定義される。すなわち、電縫溶接部のシャルピー衝撃試験を行うことにより得られる破面を電子顕微鏡により倍率５００倍以上で少なくとも１０視野観察して、その破面内に観察される酸化物を含んだディンプル破面部分を選別して、その総面積を測定し、これの視野総面積に対する割合を酸化物面積率とした。
The inventors have observed in detail the flow of the shielding gas. Furthermore, various shield gas spraying conditions such as the position and size of the
As a result, it was discovered that by optimizing the spraying conditions of the shielding gas, the oxygen concentration of the welded part was 0.01% by mass or less and the oxide area ratio of the welded part was 0.1% or less. did. Here, the oxide area ratio of the weld is defined as follows. That is, a fracture surface obtained by conducting a Charpy impact test of an electric resistance welded portion is observed with an electron microscope at a magnification of 500 times or more and at least 10 visual fields, and a dimple fracture surface containing oxide observed in the fracture surface A portion was selected and its total area was measured, and the ratio of the total area of the visual field was defined as the oxide area ratio.
前記発見した最適条件は、被溶接部１１上端からガス放出口１Ａまでの高さであるノズル高さが５ｍｍ以上３００ｍｍ以下（図１(b)参照）、且つ、ガス放出口１Ａでのシールドガス５の流速（以下、ガス出口流速ともいう）が０．５ｍ／ｓ以上５０ｍ／ｓ以下（図１(d)参照）である。
前記ノズル高さが３００ｍｍを超えるとシールドガスが充分に被溶接部１１に届かず、被溶接部１１の酸素濃度が０．０１質量％以下にならない。前記ノズル高さは小さい方が望ましいのであるが、５ｍｍを下回ると、加熱されている被溶接部１１からの輻射熱でガス放出口１Ａが傷み易く、更に被溶接部１１で発生したスパッタが衝突してノズル１の耐久性が劣化する。
The optimum condition found above is that the nozzle height, which is the height from the upper end of the welded
When the nozzle height exceeds 300 mm, the shield gas does not sufficiently reach the welded
前記ガス出口流速が小さすぎると、シールドガス５は周囲に拡散し、被溶接部１１のガスシールドが不十分となる（図１(c)参照）。前記ガス出口流速が大き過ぎると、シールドガス５の勢いが強くなりすぎ、被溶接部１１の端面間への大気巻き込み６を生じてしまう（図１(e)参照）。ガス出口流速が適正流速（０．５〜５０ｍ／ｓ）であると、被溶接部１１の端面間にシールドガス５が過不足なく充満し、大気巻き込みも無く、充分なガスシールドが達成できる（図１(d)参照）。
If the gas outlet flow velocity is too small, the
因みに図２は、一例としてノズル高さ＝５０ｍｍとし、出口ガス流速を種々変えて被溶接部１１にシールドガス５を吹き付け、被溶接部１１の端面間の中間位置で酸素濃度を測定した結果を示す線図であり、この例から分る様に、ガス出口流速＝０．５〜５０ｍ／ｓとする事によって、酸素濃度０．０１質量％以下が大きな余裕を持って（即ち確実に）クリアできる。
For example, FIG. 2 shows the result of measuring the oxygen concentration at an intermediate position between the end faces of the welded
また、ガス放出口１Ａの形状については、通管方向２０成分である長さが３０ｍｍ以上、素管エッジ突合せ方向成分である幅が５ｍｍ以上の矩形状にすると、被溶接部１１へのガス吹付けをより均一にすることができて好ましい。
また、図１(b)に示す様に、ガス放出口１Ａの素管エッジ突合せ方向である幅をＲと記し、ガス放出口１Ａの直下の被溶接部１１の端面間の最大間隔をＷと記すとして、Ｒ／Ｗ＞１．０、を満たす様にすると、被溶接部１１の酸素濃度をより速やかに低減させる事ができて好ましい。更に好ましくは１．５＜Ｒ／Ｗ＜２５を満たす様にする。
As for the shape of the
As shown in FIG. 1 (b), the width of the
シールドガスとしては不活性ガスを用いる。此処に云う不活性ガスとは、窒素ガス、ヘリウムガス、アルゴンガス、ネオンガス、キセノンガス等、若しくはこれらの２種以上を混合してなる混合ガスなどを意味する。また、不活性ガスの純度は99.9％以上が好ましい。
更に、シールドガスとして、前記不活性ガスに代えて、還元性ガスを０．１質量％以上含有するガスとしてもよく、然も、むしろこの方が、ペネトレータの原因となる酸化物の生成を抑制する効果がより強くなり、溶接部の靭性または強度を、より大きく向上させることができて好ましい。此処に云う還元性ガスとは、水素ガス、一酸化炭素ガス、メタンガス、プロパンガス等、若しくはこれらの２種以上を混合してなる混合ガスを意味する。尚、還元性ガスを０．１質量％以上含有するガスとしては、還元性ガスのみからなる組成、または、還元性ガス：０．１質量％以上を含有し残部が不活性ガスからなる組成のものが好適である。
また、入手容易性および廉価性の点からは、シールドガスとして次のガスを用いる事が好ましい。
An inert gas is used as the shielding gas. The inert gas referred to here means nitrogen gas, helium gas, argon gas, neon gas, xenon gas, or the like, or a mixed gas formed by mixing two or more of these. The purity of the inert gas is preferably 99.9% or more.
Further, as the shielding gas, a gas containing 0.1% by mass or more of a reducing gas may be used instead of the inert gas. However, this rather suppresses the generation of oxides that cause the penetrator. This is preferable because the effect becomes stronger and the toughness or strength of the welded portion can be greatly improved. Here, the reducing gas means hydrogen gas, carbon monoxide gas, methane gas, propane gas, or a mixed gas obtained by mixing two or more of these. As the gas containing 0.1% by mass or more of the reducing gas, a composition consisting of only the reducing gas, or a composition containing the reducing gas: 0.1% by mass or more and the balance comprising an inert gas. Those are preferred.
From the viewpoint of availability and low cost, it is preferable to use the following gas as the shielding gas.
(イ) 不活性ガス単独使用の場合：(A) 窒素ガス、ヘリウムガス、アルゴンガスの何れか１種若しくはこれら２種以上の混合ガス。特に好ましい不活性ガスの組み合わせは（窒素ガス＋アルゴンガス）である。
(ロ) 還元性ガス単独使用の場合：(B) 水素ガス、一酸化炭素ガスの何れか１種若しくはこれら２種の混合ガス。
(ハ) 不活性ガスと還元性ガスの混合ガス使用の場合：前記(A)と(B)の混合ガス。特に好ましい混合ガスの組合せは（窒素ガス＋水素ガス）である。
尚、特に、水素ガスおよび／または一酸化炭素ガスを含むガスを使用する場合、遺漏無き安全対策をとるべきことは云うまでも無い。
(B) In the case of using an inert gas alone: (A) Any one of nitrogen gas, helium gas and argon gas, or a mixed gas of two or more of these. A particularly preferable inert gas combination is (nitrogen gas + argon gas).
(B) When using reducing gas alone: (B) One of hydrogen gas and carbon monoxide gas, or a mixture of these two.
(C) When using a mixed gas of an inert gas and a reducing gas: the mixed gas of (A) and (B). A particularly preferable mixed gas combination is (nitrogen gas + hydrogen gas).
In particular, when using gas containing hydrogen gas and / or carbon monoxide gas, it goes without saying that safety measures should be taken without omission.
次に、上述したシールドガス吹付け用ノズル１を被溶接部１１の直上に配置したまま、溶接状況を観察する方法について検討した結果、図３に示すように、前記シールドガス吹付け用ノズル１を形成する装置上面にガラスまたは透明の樹脂材料からなるアスペクト比が５：１以下で面積が１００ｍｍ２以上の透視窓４を設けることで、前記透視窓４の上方から溶接状況の観察が可能であることを見出した。前記透視窓４のアスペクト比が５：１超または面積が１００ｍｍ2未満の場合には、溶接状況を監視するための視野を確保することができない。
Next, as a result of studying a method of observing the welding state with the above-described shield
ここで、前記ガラスは、耐熱性と強度を備える点から、強化ガラスまたは耐熱ガラスであることが望ましい。また、透明の樹脂材料は、耐熱性と強度および透明度の観点から、ポリカーボネットあるいはアクリルであることが望ましい。さらに、上記ガラスおよび透明の樹脂材料の厚みは、強度を確保するために１ｍｍ以上であることが望ましく、透明度を確保するためには１０ｍｍ以下が望ましい。なお、前記シールドガス吹付け用ノズル１を形成する装置上面全体を上記ガラスまたは透明の樹脂材料とすることも可能である。
Here, the glass is preferably tempered glass or heat-resistant glass from the viewpoint of heat resistance and strength. The transparent resin material is preferably polycarbonate or acrylic from the viewpoints of heat resistance, strength, and transparency. Furthermore, the thickness of the glass and the transparent resin material is desirably 1 mm or more in order to ensure strength, and desirably 10 mm or less in order to ensure transparency. The entire upper surface of the apparatus for forming the shield
次に、溶接状況を連続的に監視・制御するため、前記透視窓の上方５ｍ以内で前記透視窓の鉛直方向となす角度が４５度の範囲内に溶接部監視用の高速度カメラＡおよび／またはスパーク検出用のカメラＢを配置することが好ましい。ここで、前記高速度カメラＡはデジタル式で溶接点近傍箇所を１／２００秒以下の撮影速度で１０ミリ秒以上の時間連続撮影可能なものであり、前記カメラＢは撮像回数（コマ数）＝３０回／秒程度、露光時間＝（１／３０）秒＝３３ミリ秒程度で発光の青色成分を抽出できるカラーカメラまたはレンズの前面に所定の透過特性を有する青色フィルターを装着したＣＣＤカメラやＣＭＯＳカメラであることが望ましい。また、前記高速度カメラＡまたは前記高速度カメラＢの位置が前記透視窓の上方５ｍを超えると視野が狭くなりすぎて溶接部の監視ができないだけでなく、視野の調整が非常に困難になる。また、前記透視窓の鉛直方向となす角度が４５度を超えると、斜めからの視野になり、溶接現象やスパッタ発生現象を観察することが困難になる。 Next, in order to continuously monitor and control the welding situation, the high-speed camera A for monitoring the welded portion and the angle between the vertical direction of the fluoroscopic window within 45 m within 5 m above the fluoroscopic window and / or Or it is preferable to arrange | position the camera B for a spark detection. Here, the high-speed camera A is a digital type capable of continuously shooting a portion in the vicinity of the welding point at a shooting speed of 1/200 second or less for a time of 10 milliseconds or longer, and the camera B is capable of imaging (number of frames). A color camera that can extract a blue component of light emission at about 30 times / second, an exposure time of about (1/30) second = 33 milliseconds, or a CCD camera equipped with a blue filter having a predetermined transmission characteristic on the front surface of the lens, A CMOS camera is desirable. Further, when the position of the high-speed camera A or the high-speed camera B exceeds 5 m above the fluoroscopic window, the field of view becomes too narrow to monitor the welded portion, and it is very difficult to adjust the field of view. . Further, when the angle formed by the vertical direction of the see-through window exceeds 45 degrees, it becomes a visual field from an oblique direction, and it becomes difficult to observe the welding phenomenon and the spatter generation phenomenon.
なお、前記高速度カメラＡを用いて行う電縫溶接の監視・制御は、本発明者らが提案した電縫溶接システム（特開２００９−２５５１３２）を採用して行うことが望ましい。また、スパーク検出方法としては、本発明者らが提案したスパーク検出方法およびスパーク検出装置（特開２００９−７２７８８）を採用することが望ましい。 In addition, it is desirable to perform the monitoring and control of the electric resistance welding performed using the high-speed camera A by using the electric resistance welding system proposed by the present inventors (Japanese Patent Laid-Open No. 2009-255132). As the spark detection method, it is desirable to employ the spark detection method and the spark detection device (Japanese Patent Laid-Open No. 2009-72788) proposed by the present inventors.
鋼帯からなる帯材を、アンコイラー、レベラー、ロール成形機、電縫溶接機、サイザーをこの順に配置して構成された造管設備に通して、外径６００ｍｍ、肉厚２０．６ｍｍの低炭素低合金鋼の電縫鋼管を製造する工程において、電縫溶接時に被溶接部へのガスシールドを実行するにあたり、図３に示した本発明に係る電縫鋼管の溶接部シールドシステムを用いて、上述した実施形態の本発明範囲の内または外でガス吹付け条件の水準を表１に示すとおり種々変えて実行し、被溶接部の酸素濃度の測定、および溶接部の酸化物面積率の測定を行った。尚、開先形状は、ストレート形状とした。その結果を表１に示す。 The steel strip is passed through a pipe making facility composed of an uncoiler, leveler, roll forming machine, electric seam welder, and sizer in this order, and a low carbon with an outer diameter of 600 mm and a wall thickness of 20.6 mm. In the process of producing the low-alloy steel electric resistance welded pipe, in performing the gas shield to the welded part at the time of electric resistance welding, using the welded part shield system of the electric resistance welded pipe according to the present invention shown in FIG. The level of the gas spraying condition is varied as shown in Table 1 within or outside the scope of the present invention of the above-described embodiment, and the measurement of the oxygen concentration of the welded part and the measurement of the oxide area ratio of the welded part are performed. Went. The groove shape was a straight shape. The results are shown in Table 1.
表１に示されるとおり、本発明例では、比較例と比べて被溶接部の酸素濃度が桁違いに低減し、溶接部の酸化物面積率が格段に低減した。
また、上記実施例の電縫鋼管製造工程において、通管方向成分である長さが２０ｍｍ、素管エッジ突合せ方向成分である幅が７ｍｍの矩形で厚さ２ｍｍの耐熱ガラスからなる透視窓の上方４ｍの位置に特開２００９−２５５１３２で提案した溶接部監視用の前記高速度カメラＡおよび前記透視窓の上方３ｍの位置に特開２００９−７２７８８で提案したスパーク検出用の前記カメラＢを図４に示すように配置した。その結果、溶接現象の監視、スパークの検出とも十分な視野が確保でき、その機能を達成することができた。
As shown in Table 1, in the inventive example, the oxygen concentration in the welded portion was remarkably reduced as compared with the comparative example, and the oxide area ratio in the welded portion was significantly reduced.
Further, in the ERW steel pipe manufacturing process of the above embodiment, the length of the pipe direction component is 20 mm, the width of the raw pipe edge butting direction component is 7 mm, and a transparent window made of heat-resistant glass having a thickness of 2 mm. The high-speed camera A for monitoring a weld proposed in Japanese Patent Laid-Open No. 2009-255132 at a position 4 m and the camera B for detecting a spark proposed in Japanese Patent Laid-Open No. 2009-72788 at a position 3 m above the see-through window are shown in FIG. As shown in FIG. As a result, it was possible to secure a sufficient field of view for the monitoring of welding phenomena and the detection of sparks, and to achieve their functions.
１ ノズル（シールドガス吹付け用ノズル）
１Ａ ガス放出口
２ ガス配管
３ ガス流調整器
４ 透視窓
５ シールドガス
６ 大気巻き込み
７ 溶接部監視用高速度カメラＡ
８ スパーク検出用カメラＢ
１０ 素管（オープン管）
１１ 被溶接部（素管エッジ突合せ部）
１２ 素管エッジ部加熱起点
１３ 溶接点
１５ 電縫鋼管
１６ スクイズロール
２０ 通管方向
1 Nozzle (Shield gas spray nozzle)
1A Gas discharge
8 Spark detection camera B
10 Elementary tube (open tube)
11 Welded part (element tube edge butt part)
12 Raw pipe edge
Claims (8)
前記被溶接部に対し該被溶接部上端から５〜３００ｍｍ上方の位置にガス放出口を配位したシールドガス吹付け用ノズルと、
前記ガス放出口から放出される前記シールドガスの流速を０．５〜５０ｍ／ｓに制御するガス流調整手段と、
前記シールドガス吹付け用ノズルから構成される溶接部シールド装置上面にガラスまたは透明の樹脂材料からなるアスペクト比が５：１以下で面積が１００ｍｍ２以上の透視窓と、
を有することを特徴とする電縫鋼管の溶接部シールドシステム。 In the manufacture of ERW steel pipe, a welded shield system for ERW steel pipe that shields the welded part at the time of ERW welding by spraying a shield gas made of inert gas from above,
A shield gas blowing nozzle in which a gas discharge port is arranged at a position 5 to 300 mm above the welded portion upper end with respect to the welded portion;
Gas flow adjusting means for controlling the flow rate of the shield gas discharged from the gas discharge port to 0.5 to 50 m / s;
A see-through window having an aspect ratio of 5: 1 or less and an area of 100 mm 2 or more formed of glass or a transparent resin material on the upper surface of a welding part shield device composed of the nozzle for spraying the shield gas;
A welded shield system for an electric resistance welded steel pipe.
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| WO2016143271A1 (en) * | 2015-03-12 | 2016-09-15 | Ｊｆｅスチール株式会社 | Electric resistance welded stainless clad steel pipe and method of manufacturing same |
| WO2016143473A1 (en) * | 2015-03-10 | 2016-09-15 | Ｊｆｅスチール株式会社 | Method of monitoring manufacturing status of electric resistance welded pipe, device for monitoring manufacturing status of electric resistance welded pipe, and method of manufacturing electric resistance welded pipe |
| EP3511082A4 (en) * | 2016-09-12 | 2019-09-11 | JFE Steel Corporation | Clad welded pipe and method of manufacturing same |
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