JP2870433B2 - Manufacturing method of welded pipe - Google Patents
Manufacturing method of welded pipeInfo
- Publication number
- JP2870433B2 JP2870433B2 JP6326532A JP32653294A JP2870433B2 JP 2870433 B2 JP2870433 B2 JP 2870433B2 JP 6326532 A JP6326532 A JP 6326532A JP 32653294 A JP32653294 A JP 32653294A JP 2870433 B2 JP2870433 B2 JP 2870433B2
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- upset
- welded
- width
- manufacturing
- 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 - Fee Related
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- Laser Beam Processing (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、鋼帯を連続的に搬送
して円筒状に成形しつつ鋼帯端部を突き合わせて溶接す
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 steel strips are continuously conveyed and formed into a cylindrical shape, and ends of the steel strips are butt welded.
【０００２】[0002]
【従来の技術】電縫管は、鋼帯を成形ロール群の中に通
過させて管形状に成形し、突き合わせされた鋼帯のエッ
ジ部（以下、鋼帯端部と呼ぶ）を高周波電流により加熱
溶融させ、スクイズロールでアプセット溶接することに
より製造される。このアプセット溶接におけるアプセッ
ト量は、電縫管の溶接部の品質を決定する要因の一つで
ある。溶融された溶接部にアプセットを行うことによ
り、接合部となる鋼帯端部に生じた酸化物は、溶融金属
と共に溶接部外に排出される。従って、接合部に酸化物
が残存しないように、スクイズロールで強いアプセット
力を加える必要がある。2. Description of the Related Art An electric resistance welded pipe is formed by passing a steel strip through a group of forming rolls to form a pipe shape, and the edges of the butted steel strip (hereinafter referred to as steel strip ends) are subjected to high-frequency current. It is manufactured by heating and melting and upset welding with a squeeze roll. The upset amount in the upset welding is one of the factors that determine the quality of the welded portion of the ERW pipe. By performing the upset on the melted weld, the oxide generated at the end of the steel strip serving as the joint is discharged out of the weld together with the molten metal. Therefore, it is necessary to apply a strong upset force with a squeeze roll so that no oxide remains at the joint.
【０００３】しかしながら、強いアプセット力により溶
接部近傍の母材金属は塑性変形し、管の内外面の両方向
に塑性フローを生じる。図４は、従来技術における溶接
部近傍の母材金属の塑性フローを示す模式図である。図
中の曲線は、塑性変形前の母材金属における板面に平行
な面（の断面）を示す。塑性フローにより、板面に平行
な面が溶接部付近で立ち上がり、靱性の劣化を生じる。
これは、一般に板厚方向の靱性は板面に平行な方向に比
べて低いためで、塑性フローの立ち上がりにより、板厚
方向の低い靱性の影響が無視できなくなるためである。However, the base metal near the weld is plastically deformed by a strong upset force, and a plastic flow is generated in both directions on the inner and outer surfaces of the pipe. FIG. 4 is a schematic diagram showing a plastic flow of a base metal near a weld in the related art. The curve in the figure indicates a plane (cross section) parallel to the plate surface of the base metal before plastic deformation. Due to the plastic flow, a plane parallel to the plate surface rises in the vicinity of the welded portion, causing deterioration in toughness.
This is because the toughness in the sheet thickness direction is generally lower than that in the direction parallel to the sheet surface, and the effect of low toughness in the sheet thickness direction cannot be ignored due to the rise of the plastic flow.
【０００４】一方、アプセット力が弱い場合は、管の厚
さ方向の高周波電流の分布が不均一となる。その結果、
接合部の端面の溶融が不均一となり、健全な溶接部を得
ることができない。また、溶融金属のヒケにより、溶接
部にアンダカット（凹み）が発生する。図５は、上記ア
ンダカットが発生した溶接部の形状を示す断面図であ
る。On the other hand, when the upset force is weak, the distribution of the high-frequency current in the thickness direction of the tube becomes uneven. as a result,
The melting of the end face of the joint becomes uneven, and a sound weld cannot be obtained. In addition, undercut of the molten metal causes an undercut (dent) in the welded portion. FIG. 5 is a sectional view showing the shape of the welded portion where the undercut has occurred.
【０００５】そこで、特公平３−７１９４７号公報記載
の技術では、管の厚さ方向の３０〜８０％の範囲にレー
ザビームを照射して、電縫管を製造する方法が提案され
ている。この技術では、均一な溶融状態が実現でき、ア
プセット力はレーザビームを使用しない場合より低くて
よいとされている。溶接部については、塑性フローの角
度は４０°以下に抑えることができ、しかも溶融金属は
殆ど残存していないと報告されている。Therefore, in the technique described in Japanese Patent Publication No. 3-71947, a method of manufacturing an electric resistance welded pipe by irradiating a laser beam to a range of 30 to 80% in a thickness direction of the pipe has been proposed. According to this technique, a uniform molten state can be realized, and the upset force may be lower than when no laser beam is used. It is reported that the angle of the plastic flow can be suppressed to 40 ° or less in the welded portion, and that almost no molten metal remains.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、特公平
３−７１９４７号公報記載の技術では、接合部の端部表
層がレーザビームではなく高周波等で加熱されているの
で、加熱時間が長くかかる。その結果、加熱中に酸化物
の生成が避けられず、その部分は板厚の外部に押し出す
必要がある。その結果、強いアプセットを行う必要があ
り、塑性フローの形成が避けられない。そのため、塑性
フローの立ち上がりにより、管の円周方向の応力に対し
て、板厚方向の機械特性の成分が無視できなくなる。機
械特性の内靱性は、板厚方向で特性が低下するので、従
来技術の溶接方法では靱性の劣化が避けられない。However, according to the technique described in Japanese Patent Publication No. 3-71947, the end surface layer of the joint is heated not by a laser beam but by a high frequency or the like, so that a long heating time is required. As a result, the formation of oxide during heating is inevitable, and that portion must be extruded to the outside of the plate thickness. As a result, it is necessary to perform a strong upset, and formation of a plastic flow is inevitable. Therefore, due to the rise of the plastic flow, the component of the mechanical properties in the thickness direction cannot be ignored with respect to the stress in the circumferential direction of the pipe. Since the internal toughness of the mechanical properties decreases in the thickness direction, deterioration of the toughness is inevitable with the conventional welding method.
【０００７】また、レーザビームで板厚の特定領域（中
央部の３０〜８０％）のみを溶融させることは、実際に
は容易ではなく高度の制御技術が要求されるとともに、
安定した操業条件の維持が前提となる。Further, melting only a specific region (30 to 80% of the central portion) of the plate thickness by a laser beam is not easy in practice, and requires a high level of control technology.
It is assumed that stable operating conditions are maintained.
【０００８】この発明は、上記の塑性フローの立ち上が
りを無くし、溶接部品質を確保しつつ操業が容易な溶接
管の製造方法を提供する。The present invention provides a method for manufacturing a welded pipe that eliminates the rise of the plastic flow described above, ensures the quality of the welded portion, and is easy to operate.
【０００９】[0009]
【課題を解決するための手段】請求項１の発明は、鋼帯
を連続的に搬送して幅方向両側の鋼帯端部が対向するよ
うに円筒状に成形しつつ、これら鋼帯端部を突き合わせ
て溶接する溶接管の製造方法において、前記鋼帯端部を
予熱後、これら鋼帯端部の突き合わせ部分に高密度エネ
ルギービームを照射して、この突き合わせ部分を全管厚
にわたって溶融させ、この溶融部分の幅と同一又はそれ
以下のアプセット量でこの突き合わせ部分を加圧するこ
とを特徴とする溶接管の製造方法である。According to the first aspect of the present invention, the steel strips are continuously conveyed and formed into a cylindrical shape such that the ends of the steel strips on both sides in the width direction face each other. In the method for manufacturing a welded pipe to butt and weld, after preheating the steel strip end, irradiating a high-density energy beam to the butt portion of these steel strip end, melting this butt portion over the entire pipe thickness, A method of manufacturing a welded pipe, comprising pressurizing the butt portion with an upset amount equal to or less than the width of the molten portion.
【００１０】請求項２の発明は、アプセット量を溶融部
分の幅の０．２〜１．０倍とすることを特徴とする請求
項１記載の溶接管の製造方法である。A second aspect of the present invention is the method for manufacturing a welded pipe according to the first aspect, wherein the upset amount is 0.2 to 1.0 times the width of the molten portion.
【００１１】[0011]
【作用】請求項１の発明では、鋼帯端部の予熱と突き合
わせ部分への高密度エネルギービームの照射を組み合わ
せている。予熱を行うのは、高密度エネルギービームの
発生装置の容量を小さくし、装置の設置スペースや設備
コストを節約するためである。このため、少なくとも鋼
帯端部の酸化膜の生成が僅かである低温域（６００℃程
度）は、予熱とすることが望ましい。これとは逆に、予
熱し過ぎると酸化膜の生成が激しくなり、また酸化膜の
組成が変化し除去されにくくなるので、予熱を行うのは
１２００℃前後（酸化物の変態点近傍）以下の温度まで
とすべきである。According to the first aspect of the present invention, the preheating of the end portion of the steel strip and the irradiation of the high-density energy beam to the butted portion are combined. The preheating is performed in order to reduce the capacity of the high-density energy beam generator and to save the installation space and equipment cost of the apparatus. For this reason, it is desirable to preheat at least the low temperature region (about 600 ° C.) where the oxide film at the end of the steel strip is slightly generated. Conversely, if preheating is excessive, the formation of an oxide film becomes intense, and the composition of the oxide film changes, making it difficult to remove the oxide film. Therefore, preheating is performed at about 1200 ° C. (near the transformation point of the oxide) or lower. Should be up to temperature.
【００１２】このように、鋼帯端部を予熱後、高密度エ
ネルギービームにより短時間で溶融させているので、鋼
帯端部の表面には酸化物等が生じにくい。その後、この
突き合わせ部分は、アプセットにより接合されるが、全
管厚にわたって溶融金属により覆われているので容易に
接合される。As described above, since the end portion of the steel strip is melted in a short time by the high-density energy beam after preheating the end portion of the steel strip, oxides and the like hardly occur on the surface of the end portion of the steel strip. Thereafter, the butted portion is joined by an upset, but is easily joined because it is covered with molten metal over the entire pipe thickness.
【００１３】また、突き合わせ部分が全管厚にわたって
溶融させているので、仮に酸化物等が生じていたとして
も、突き合わせにより溶融金属が合体していくのに伴
い、溶融金属の表面張力で接合部の外側に移動する。そ
の結果、これら酸化物等は接合部から排除され溶接部に
は残らない。このようにして、鋼帯端部を全管厚にわた
って溶融させることにより、管厚の一部のみ溶融させた
場合と比べて、より健全な溶接部が得られる。Further, since the butted portion is melted over the entire pipe thickness, even if an oxide or the like is generated, the joint is formed by the surface tension of the molten metal as the molten metal is united by the butting. Move outside of. As a result, these oxides and the like are removed from the joint and do not remain in the weld. In this way, by melting the end portion of the steel strip over the entire pipe thickness, a sounder weld can be obtained as compared with a case where only a part of the pipe thickness is melted.
【００１４】突き合わせ部分の加圧によるアプセット
（圧縮）は、アプセット量（圧縮量）が溶融部分の幅を
超えない範囲としているので、アプセットの影響はほぼ
溶融金属の部分に限られる。従って、鋼帯端部の溶融し
ていない部分は殆ど変形せずに済み、溶接部近傍の塑性
フローを実質的に無くすことができる。結局、溶融金属
のヒケによるアンダカット（凹み）が生じない程度にア
プセット量を調節しておけばよく、アプセットの加圧力
の制御等が簡略化される。Since the upset (compression) by pressurizing the butted portion is set so that the upset amount (compression amount) does not exceed the width of the molten portion, the effect of the upset is substantially limited to the molten metal portion. Therefore, the unmelted portion of the steel strip end is hardly deformed, and the plastic flow near the welded portion can be substantially eliminated. As a result, the upset amount may be adjusted to such an extent that the undercut (dent) due to sink of the molten metal does not occur, and the control of the pressing force of the upset is simplified.
【００１５】また、この発明では、突き合わせ部分の全
管厚にわたって、高密度エネルギービームで溶融される
ので、接合部が短時間で溶融し溶接速度が高速化する。
更に、高密度エネルギービームの照射位置が、管厚の特
定領域ではなく全管厚であるので、位置制御が容易であ
り、照射位置のズレ等の影響を受けにくいので操業条件
が多少不安定でも、使用可能である。In the present invention, since the high-density energy beam is used to melt the entire pipe thickness at the butted portion, the welded portion is melted in a short time and the welding speed is increased.
Furthermore, since the irradiation position of the high-density energy beam is not the specific region of the tube thickness but the entire tube thickness, position control is easy, and the irradiation position is hardly affected by a shift or the like, so that even if the operating conditions are somewhat unstable, , Is available.
【００１６】請求項２の発明は、溶接速度を高くした場
合に生じやすいアンダカットを確実に防止する方法を提
供する。そのために、この発明ではアプセット量を限定
している。詳細は、後述の実施例の項で説明するが、ア
プセット量が溶融部分の幅の０．２倍未満では、溶接速
度が４ｍ／分を超える場合、アンダカットを生じること
がある。従って、アプセット量の下限を溶融部分の幅の
０．２倍以上とする。アプセット量の上限は前述と同
様、鋼帯端部の溶融部分の幅を超えない範囲、即ち１．
０倍以下としているので、溶接部近傍の塑性フローを実
質的に無くすことができる。A second aspect of the present invention provides a method for reliably preventing an undercut that tends to occur when the welding speed is increased. Therefore, in the present invention, the upset amount is limited. As will be described later in detail in the section of Examples, when the upset amount is less than 0.2 times the width of the molten portion, undercutting may occur when the welding speed exceeds 4 m / min. Therefore, the lower limit of the upset amount is set to 0.2 times or more the width of the molten portion. As described above, the upper limit of the upset amount does not exceed the width of the molten portion at the end of the steel strip, that is, 1.
Since it is 0 or less, the plastic flow near the weld can be substantially eliminated.
【００１７】[0017]
【実施例】図１は、この発明に用いる装置の概要を示す
図である。図中、１は鋼帯、２は鋼帯端部、３は給電チ
ップ、４は高密度エネルギービーム、５はビームガイ
ド、６はスクイズロール、７はトップロール、２１は溶
接部、４１は高密度エネルギービーム源をそれぞれ示
す。高密度エネルギービーム源４１には、レーザビーム
発生装置を用いた。これには、レーザ溶接機等を用いる
ことができる。FIG. 1 is a diagram showing an outline of an apparatus used in the present invention. In the figure, 1 is a steel strip, 2 is an end of the steel strip, 3 is a feed tip, 4 is a high-density energy beam, 5 is a beam guide, 6 is a squeeze roll, 7 is a top roll, 21 is a welded part, and 41 is a high part. 2 shows a density energy beam source, respectively. As the high-density energy beam source 41, a laser beam generator was used. For this, a laser welding machine or the like can be used.
【００１８】鋼帯１は管の形状に成形され、その端部
２、２は給電チップ３、３により供給される高周波電力
により加熱される。高密度エネルギービーム源４１から
ビームガイド５を通して鋼帯端部２、２の突き合わせ部
分にレーザビーム４が照射される。ここで、入熱量は溶
接部２１の板厚の全体が溶融するよう、管の送り速度等
により適宜調節する。The steel strip 1 is formed in the shape of a tube, and its ends 2, 2 are heated by the high-frequency power supplied by the power supply tips 3, 3. The laser beam 4 is applied from the high-density energy beam source 41 to the butted portion of the steel strip ends 2, 2 through the beam guide 5. Here, the amount of heat input is appropriately adjusted by the pipe feed speed or the like so that the entire thickness of the welded portion 21 is melted.
【００１９】この実施例では、高密度エネルギービーム
４の照射位置を、スクイズロール６、６の中心軸を結ん
だ線と突き合わせ線との交点近傍としているので、ビー
ム４が確実に鋼帯端部２、２の板厚全体に照射され、溶
融が効率的に行える。ここで、照射位置が上記の交点よ
り前過ぎると、ビーム４の大半が鋼帯端部２、２の隙間
を通過してしまい、ビームの照射効率が低下する。ま
た、照射位置が上記の交点より後過ぎると、ビーム４は
鋼帯端部２、２のアプセット中ないしはアプセット後に
照射されることになり、溶接部２１は溶融が不十分なま
ま接合され、溶接部の品質が確保できない。In this embodiment, the irradiation position of the high-density energy beam 4 is located near the intersection of the line connecting the central axes of the squeeze rolls 6 and the butt line. Irradiation is performed over the entire thickness of 2, 2 so that melting can be performed efficiently. Here, if the irradiation position is too far ahead of the intersection, most of the beam 4 passes through the gap between the steel strip ends 2 and 2, and the irradiation efficiency of the beam decreases. If the irradiation position is too long after the intersection, the beam 4 is irradiated during or after the upsetting of the steel strip ends 2 and 2, and the welded portion 21 is joined with insufficient melting, and the welding is performed. The quality of the department cannot be secured.
【００２０】その他、この実施例ではスクイズロール６
により加圧して、アプセット量を制御している。その方
法は、溶接部付近の形状又は溶接前の突き合わせ部の隙
間の寸法を、レーザ光切断法等の形状検出方法又は寸法
測定方法により求め、その結果に基づき、油圧シリンダ
等のアクチュエータを作動させ、スクイズロール６、６
の加圧力又は間隔を制御することを特徴とする方法であ
る。In addition, in this embodiment, the squeeze roll 6
To control the upset amount. In this method, the shape near the welded portion or the dimension of the gap between the butted portions before welding is determined by a shape detecting method such as a laser beam cutting method or a dimension measuring method, and based on the result, an actuator such as a hydraulic cylinder is operated. , Squeeze roll 6, 6
The method is characterized in that the pressure or the interval of the pressure is controlled.
【００２１】図２は、溶接速度とアプセット量に対する
アンダカット発生の有無を示す図である。横軸は溶接速
度、縦軸は溶融金属幅に対するアプセット量の比を示
す。装置には、１３００ｋｗの高周波溶接装置を出力２
００ｋｗで使用し、５ｋｗレーザ発生装置を用いて、板
厚５ｍｍの熱延鋼帯を、溶接速度２〜１０ｍ／分で溶接
した。アプセット量は０〜３ｍｍで、溶融金属幅の０〜
２倍で実験した。FIG. 2 is a diagram showing the presence or absence of undercut with respect to the welding speed and the upset amount. The horizontal axis shows the welding speed, and the vertical axis shows the ratio of the upset amount to the molten metal width. Output 1300kw high frequency welding equipment
A hot rolled steel strip having a thickness of 5 mm was welded at a welding speed of 2 to 10 m / min using a 5 kW laser generator at 00 kw. The upset amount is 0 to 3 mm and the molten metal width is 0 to
Experimented at 2x.
【００２２】図２より、溶接速度が４ｍ／分以下では、
アプセット量０でもアンダカットは発生していない。溶
接速度が４ｍ／分を超えると、アプセット量が小さい領
域でアンダカットが発生している。しかしながら、アプ
セット量を溶融金属幅の０．２倍以上にすると、溶接速
度の高い領域でもアンダカットは発生しなくなることが
わかる。FIG. 2 shows that when the welding speed is 4 m / min or less,
Undercut does not occur even when the upset amount is 0. When the welding speed exceeds 4 m / min, undercut occurs in a region where the upset amount is small. However, when the upset amount is 0.2 times or more the width of the molten metal, undercutting does not occur even in a region where the welding speed is high.
【００２３】図３は、アプセット量と溶接部の靱性の関
係を示す図である。図中、横軸は溶融金属幅に対するア
プセット量の比、縦軸はシャルピー衝撃試験による吸収
エネルギー（シャルピー衝撃値）を示す。アプセット量
の比が１．０以下、即ちアプセット量が溶融金属幅以内
では、シャルピー衝撃値はほぼ一定である。アプセット
量の比が１．０を超えると、シャルピー衝撃値の低下が
見られる。これは、アプセット量が溶融金属幅を超える
と、接合面から溶融金属がほぼ完全に排除され、鋼帯端
部の塑性フローが立ち上がって来ることによると考えら
れる。FIG. 3 is a diagram showing the relationship between the upset amount and the toughness of the welded portion. In the figure, the horizontal axis represents the ratio of the upset amount to the width of the molten metal, and the vertical axis represents the absorbed energy (Charpy impact value) by the Charpy impact test. When the ratio of the upset amount is 1.0 or less, that is, when the upset amount is within the molten metal width, the Charpy impact value is almost constant. When the ratio of the upset amount exceeds 1.0, a decrease in the Charpy impact value is observed. This is considered to be due to the fact that when the upset amount exceeds the width of the molten metal, the molten metal is almost completely removed from the joining surface, and the plastic flow at the end of the steel strip rises.
【００２４】[0024]
【発明の効果】この発明では、溶接管の製造方法におい
て、高密度エネルギービームにより、溶接部の板厚全体
を溶融させている。その結果、突き合わせ部分における
鋼帯端部の塑性フローの立ち上がりを実質的に無くし、
良好な溶接部品質を確保するとともに、溶接速度の向上
が実現できる。According to the present invention, in the method for manufacturing a welded pipe, the entire thickness of the welded portion is melted by a high-density energy beam. As a result, the rise of the plastic flow at the end of the steel strip at the butted portion is substantially eliminated,
Good welding quality can be ensured and the welding speed can be improved.
【図１】発明の１実施例に用いる装置の概要を示す図。FIG. 1 is a diagram showing an outline of an apparatus used in one embodiment of the present invention.
【図２】溶接速度とアプセット量に対するアンダカット
発生の有無を示す図。FIG. 2 is a diagram showing whether or not an undercut occurs with respect to a welding speed and an upset amount.
【図３】アプセット量と溶接部の靱性の関係を示す図。FIG. 3 is a diagram showing the relationship between the upset amount and the toughness of a weld.
【図４】従来技術における溶接部近傍の母材金属の塑性
フローを示す模式図。FIG. 4 is a schematic diagram showing a plastic flow of a base metal in the vicinity of a weld in a conventional technique.
【図５】アンダカットが発生している溶接部の形状を示
す断面図。FIG. 5 is a sectional view showing a shape of a welded portion where an undercut occurs.
１ 鋼帯 ２ 鋼帯端部 ４ 高密度エネルギービーム Reference Signs List 1 steel strip 2 steel strip end 4 high-density energy beam
───────────────────────────────────────────────────── フロントページの続き (72)発明者 菅昌 徹郎 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 昭60−206589（ＪＰ，Ａ) 特開 昭61−162281（ＪＰ，Ａ) 特開 平２−160189（ＪＰ，Ａ) 特開 平７−1170（ＪＰ，Ａ) 特開 平８−174249（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B23K 26/00 - 26/18 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Suga 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-60-206589 (JP, A) JP-A Sho 61-162281 (JP, A) JP-A-2-160189 (JP, A) JP-A 7-1170 (JP, A) JP-A 8-174249 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B23K 26/00-26/18
Claims (2)
帯端部が対向するように円筒状に成形しつつ、これら鋼
帯端部を突き合わせて溶接する溶接管の製造方法におい
て、前記鋼帯端部を予熱後、これら鋼帯端部の突き合わ
せ部分に高密度エネルギービームを照射して、この突き
合わせ部分を全管厚にわたって溶融させ、この溶融部分
の幅と同一又はそれ以下のアプセット量でこの突き合わ
せ部分を加圧することを特徴とする溶接管の製造方法。1. A method for manufacturing a welded pipe in which steel strips are continuously conveyed and formed into a cylindrical shape so that the ends of the steel strips on both sides in the width direction face each other, and the ends of the steel strips are butt-welded. After preheating the ends of the steel strip, a high-density energy beam is applied to the butted portions of the ends of the steel strip to melt the butted portion over the entire pipe thickness, and the width of the molten portion is equal to or less than the width of the molten portion. A method for manufacturing a welded pipe, comprising pressurizing the butted portion with an upset amount.
〜１．０倍とすることを特徴とする請求項１記載の溶接
管の製造方法。2. The upset amount is set to 0.2 of the width of the molten portion.
The method for manufacturing a welded pipe according to claim 1, wherein the ratio is set to 1.0 to 1.0 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6326532A JP2870433B2 (en) | 1994-12-28 | 1994-12-28 | Manufacturing method of welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6326532A JP2870433B2 (en) | 1994-12-28 | 1994-12-28 | Manufacturing method of welded pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08174253A JPH08174253A (en) | 1996-07-09 |
| JP2870433B2 true JP2870433B2 (en) | 1999-03-17 |
Family
ID=18188889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6326532A Expired - Fee Related JP2870433B2 (en) | 1994-12-28 | 1994-12-28 | Manufacturing method of welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2870433B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121046A (en) * | 2013-01-22 | 2013-05-29 | 大连交通大学 | Method and equipment for producing double-metal composite material by longitudinally wrapping and welding metal strip |
-
1994
- 1994-12-28 JP JP6326532A patent/JP2870433B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08174253A (en) | 1996-07-09 |
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