JPH0924480A - Production of welded steel pipe - Google Patents
Production of welded steel pipeInfo
- Publication number
- JPH0924480A JPH0924480A JP7199238A JP19923895A JPH0924480A JP H0924480 A JPH0924480 A JP H0924480A JP 7199238 A JP7199238 A JP 7199238A JP 19923895 A JP19923895 A JP 19923895A JP H0924480 A JPH0924480 A JP H0924480A
- Authority
- JP
- Japan
- Prior art keywords
- butt
- welded
- tubular
- energy beam
- steel strip
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/26—Seam welding of rectilinear seams
- B23K26/262—Seam welding of rectilinear seams of longitudinal seams of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、熱源として高密
度エネルギービームを使用し、溶接部に欠陥のない品質
の優れた溶接鋼管を製造するための方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a high quality welded steel pipe having no defects in welds by using a high density energy beam as a heat source.
【０００２】[0002]
【従来の技術】溶接鋼管の一つとして、電縫溶接法（Ｅ
ＲＷ）により製造される電縫鋼管が知られている。電縫
鋼管は、炭素鋼鋼帯を連続的に管状に成形しながら、そ
の両側端部を突き合わせ、突き合わせ端部を、電気抵抗
加熱または高周波誘導加熱により加熱しそして圧接する
ことにより製造される。2. Description of the Related Art As one of welded steel pipes, the electric resistance welding method (E
ERW steel pipe manufactured by RW) is known. The electric resistance welded steel pipe is produced by continuously forming a carbon steel strip into a tubular shape, but abutting both side ends thereof, heating the abutting ends by electric resistance heating or high-frequency induction heating, and pressing them.
【０００３】しかしながら、上述のようにして製造され
る電縫鋼管には、加熱時に生成する酸化物中の高融点物
質が排出されずに電縫溶接部の接合面に残留して生ずる
ペネトレータと呼ばれる面状酸化物が発生し、また、両
側端部の突き合わせ圧接により、メタルフローの立ち上
がり部が電縫溶接部の表面に露出して、靭性および加工
性の劣化を招く問題がある。However, in the electric resistance welded steel pipe manufactured as described above, the high melting point substance in the oxide generated during heating is not discharged but remains in the joint surface of the electric resistance welded portion and is called a penetrator. There is a problem that the surface oxide is generated and the rising portion of the metal flow is exposed on the surface of the electric resistance welded portion due to the butt pressure welding of both end portions, which causes deterioration of toughness and workability.
【０００４】上述した問題を解決する手段が従来から種
々研究されており、例えば、特開昭58-100982 号公報、
特開平1-309792号公報には、下記からなる高密度エネル
ギービーム溶接による溶接鋼管の製造方法（レーザＥＲ
Ｗ複合溶接法）が開示されている。鋼帯を連続的に管状
に成形し、その管状成形体の突き合わせ端部を、電気抵
抗加熱または高周波誘導加熱によって予熱し、次いで、
前記突き合わせ端部が予熱された管状成形体をスクイズ
ロールにより加圧して、その突き合わせ端部を衝合し、
衝合によって形成された突き合わせ端部の開先線に沿っ
て、高密度エネルギービームを照射し、前記開先線を前
記高密度エネルギービームにより加熱しそして溶融する
ことにより溶接する（以下、先行技術という）。Various means for solving the above-mentioned problems have been studied in the past, for example, JP-A-58-100982.
Japanese Laid-Open Patent Publication No. 1-309792 discloses a method for manufacturing a welded steel pipe by high-density energy beam welding (laser ER
W composite welding method). A steel strip is continuously formed into a tubular shape, and the butt ends of the tubular formed body are preheated by electric resistance heating or high frequency induction heating, and then,
The butt end is preheated by pressing the tubular molded body with a squeeze roll to abut the butt end,
Welding is performed by irradiating a high-density energy beam along the groove line of the abutting ends formed by abutting, heating the groove line by the high-density energy beam, and melting the beam (hereinafter referred to as prior art). That).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記先
行技術には、次のような問題がある。即ち、管状成形体
の突き合わせ端部に対する、電気抵抗加熱または高周波
誘導加熱による予熱温度が、約６００〜１２００℃であ
って高いために、溶接部の溶接金属中における酸素含有
量が３００ｐｐｍを超える。その結果、溶接部に多量の
酸化介在物が存在することになり、溶接部の靭性が劣化
する。However, the above-mentioned prior art has the following problems. That is, since the preheating temperature for electric resistance heating or high-frequency induction heating for the butt ends of the tubular formed body is high at about 600 to 1200 ° C., the oxygen content in the weld metal of the welded portion exceeds 300 ppm. As a result, a large amount of oxidized inclusions will be present in the weld, and the toughness of the weld will deteriorate.
【０００６】従って、この発明の目的は、上述した問題
を解決し、高密度エネルギービーム溶接により溶接鋼管
を製造するに際し、溶接継手部の靭性が優れた溶接鋼管
を製造するための方法を提供することにある。Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a method for producing a welded steel pipe having excellent weld joint toughness when producing a welded steel pipe by high-density energy beam welding. Especially.
【０００７】[0007]
【課題を解決するための手段】本発明者等は、上述した
観点から、高密度エネルギービーム溶接により溶接鋼管
を製造するに際し、溶接継手部の靭性が優れた溶接鋼管
を製造するための方法を開発すべく鋭意研究を重ねた。
その結果、管状成形体の突き合わせ端部を、肉厚方向に
所定角度の傾斜状に形成し、このような突き合わせ端部
を衝合し、形成された傾斜状の突き合わせ端部に対し、
その傾斜した開先線に沿って高密度エネルギービームを
照射し溶接すれば、溶接部の靭性値は、母材とほぼ同じ
になることを知見した。From the above-mentioned viewpoints, the inventors of the present invention have proposed a method for producing a welded steel pipe having excellent weld joint toughness when producing a welded steel pipe by high-density energy beam welding. We have earnestly studied for development.
As a result, the abutting end of the tubular molded body is formed in an inclined shape at a predetermined angle in the thickness direction, and the abutting end is abutted, with respect to the formed inclined abutting end,
It was found that if a high-density energy beam is irradiated along the inclined groove line and welding is performed, the toughness value of the welded portion becomes almost the same as that of the base metal.
【０００８】この発明は、上述した知見に基づいてなさ
れたものであって、この出願の請求項１に記載の発明
は、鋼帯を連続的に管状に成形し、その管状成形体の突
き合わせ端部を、電気抵抗加熱または高周波誘導加熱に
よって予熱し、次いで、前記突き合わせ端部が予熱され
た管状成形体をスクイズロールにより加圧して、その突
き合わせ端部を衝合し、衝合によって形成された突き合
わせ端部の開先線に沿って、高密度エネルギービームを
照射し、前記突き合わせ端部を前記高密度エネルギービ
ームにより加熱しそして溶融することにより溶接する、
溶接鋼管の製造方法において、予め、前記鋼帯の幅方向
両側端面を、肉厚方向に互いに平行な所定角度の傾斜状
に形成し、前記両側端面が傾斜状に形成された鋼帯を前
記管状成形体に成形し、前記管状成形体の肉厚方向に傾
斜した突き合わせ端部を予熱し次いで衝合し、衝合によ
って形成された前記突き合わせ端部の傾斜した開先線に
沿って、これと同じ傾斜角度で、前記高密度エネルギー
ビームを照射し、前記突き合わせ端部を溶接することに
特徴を有するものである。The present invention was made based on the above-mentioned findings. The invention according to claim 1 of the present application is that the steel strip is continuously formed into a tubular shape, and the butt end of the tubular formed body is formed. Part is preheated by electric resistance heating or high frequency induction heating, and then the tubular shaped body having the butt ends preheated is pressed by a squeeze roll to butt the butt ends and formed by the butt. Along the groove line of the butt end, irradiating with a high-density energy beam, and welding the butt end by heating with the high-density energy beam and melting;
In the method for manufacturing a welded steel pipe, both widthwise end faces of the steel strip are formed in advance in a slanted shape having a predetermined angle parallel to each other in the thickness direction, and the steel strip having the slanted end faces is formed into the tubular shape. Molded into a molded body, preheat the butt end inclined in the thickness direction of the tubular molded body and then abutting, along the inclined groove line of the butt end formed by the abutting, It is characterized by irradiating the high-density energy beam at the same inclination angle and welding the butt ends.
【０００９】請求項２に記載の発明は、前記管状成形体
の前記突き合わせ端部の傾斜角度、および、前記高密度
エネルギービームの照射角度を、５〜３０度の範囲内と
することに特徴を有するものであり、そして、請求項３
に記載の発明は、前記高密度エネルギービームの照射に
より溶接した溶接部における、溶接金属中の酸素量
（Ｏ）と、前記溶接部の傾斜角度（θ）とが、式、
〔Ｏ〕＝≦６×〔θ〕＋３００(ppm) の関係を満たすこ
とに特徴を有するものである。The invention according to claim 2 is characterized in that the inclination angle of the butt ends of the tubular molded body and the irradiation angle of the high-density energy beam are within the range of 5 to 30 degrees. Having, and claim 3.
In the invention described in, the oxygen content (O) in the weld metal and the inclination angle (θ) of the weld metal in the welded part welded by irradiation with the high-density energy beam are expressed by the following formula:
It is characterized by satisfying the relationship of [O] = ≦ 6 × [θ] +300 (ppm).
【００１０】[0010]
【発明の実施の形態】次に、この発明を図面を参照しな
がら説明する。図１は、この発明の溶接方法の一実施態
様を示す概略斜視図、図２は図１のＡ−Ａ線部分拡大断
面図、図３は図１のＢ−Ｂ線部分拡大断面図、図４は、
成形前の鋼帯の幅方向拡大断面図である。図４に示すよ
うに、鋼帯１は、予め、その幅方向両側端面２, ２が、
その肉厚方向に互いに平行な所定角度の傾斜状に形成さ
れている。このように、鋼帯１の幅方向両側端面２, ２
を、肉厚方向に傾斜状に形成することは、サイドトリミ
ングによって容易に行うことができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 is a schematic perspective view showing an embodiment of a welding method of the present invention, FIG. 2 is a partially enlarged sectional view taken along the line AA of FIG. 1, and FIG. 3 is a partially enlarged sectional view taken along the line BB of FIG. 4 is
It is a width direction expanded sectional view of the steel strip before shaping. As shown in FIG. 4, in the steel strip 1, the width direction side end surfaces 2 and 2 are
It is formed in a slanted shape with a predetermined angle parallel to each other in the thickness direction. In this way, the widthwise end faces 2, 2 of the steel strip 1
Can be easily formed by side trimming.
【００１１】図１において、1aは、鋼帯１の管状成形
体、３は、鋼帯１を管状成形体1aに成形し且つその突き
合わせ端部2a,2b を衝合させるための１対のスクイズロ
ール、４は、管状成形体1aの突き合わせ端部2a,2b を電
気抵抗加熱により予熱するための給電装置、６はトップ
ロールである。鋼帯１は矢印方向に連続的に移動しなが
ら管状成形体1aに成形され、管状成形体1aの傾斜した突
き合わせ端部2a,2b は、給電装置４による電気抵抗加熱
によって予熱され、次いで、１対のスクイズロール３に
より加圧されて、突き合わせ端部2a,2b が衝合される。In FIG. 1, 1a is a tubular formed body of a steel strip 1, and 3 is a pair of squeeze for forming the steel strip 1 into the tubular formed body 1a and abutting the abutting ends 2a, 2b thereof. Rolls 4 are power feeding devices for preheating the butt ends 2a, 2b of the tubular molded body 1a by electric resistance heating, and 6 is a top roll. The steel strip 1 is formed into a tubular shaped body 1a while continuously moving in the direction of the arrow, and the inclined butted ends 2a and 2b of the tubular shaped body 1a are preheated by electric resistance heating by the power feeding device 4, and then 1 It is pressed by the pair of squeeze rolls 3 and the abutting ends 2a, 2b are abutted against each other.
【００１２】その結果、図２に示すように、管状成形体
1aの突き合わせ端部2a,2b は衝合され、肉厚方向に角度
θの傾斜した突き合わせ開先線が形成される。この傾斜
した突き合わせ開先線に沿い、高密度エネルギービーム
としてレーザービーム５が、同じ傾斜角度θで照射さ
れ、開先線をレーザービーム５により加熱する。かくし
て、図３に示すように、管状成形体1aの衝合された突き
合わせ端部2a,2b は溶接されて、肉厚方向に角度θの傾
斜した溶接部７が形成される。As a result, as shown in FIG.
The butt ends 2a and 2b of the 1a are abutted with each other to form a butt groove line inclined at an angle θ in the thickness direction. The laser beam 5 is irradiated as a high-density energy beam at the same inclination angle θ along the inclined butt groove line, and the groove line is heated by the laser beam 5. Thus, as shown in FIG. 3, the abutting butted ends 2a, 2b of the tubular molded body 1a are welded to form a welded portion 7 inclined at an angle θ in the thickness direction.
【００１３】この発明によれば、上述したように、管状
成形体1aの衝合された突き合わせ端部2a,2b は、レーザ
ービーム５により溶接されて、肉厚方向に角度θの傾斜
した溶接部７が形成される。その結果、溶接部７の靭性
値は、次の理由により母材とほぼ同等になる。According to the present invention, as described above, the abutted abutting ends 2a, 2b of the tubular molded body 1a are welded by the laser beam 5 and are welded at an angle θ in the thickness direction. 7 is formed. As a result, the toughness value of the welded portion 7 becomes almost the same as that of the base metal for the following reason.
【００１４】即ち、靭性の一つの判断基準は、シャルピ
ー衝撃試験における衝撃値にあり、溶接部に衝撃を加え
た場合に、クラックがどのように伝播するかによって、
靭性が左右される。従来の方法により、図６に示すよう
に、管状成形体1aの肉厚方向に垂直な突き合わせ端部2
a',2b' をレーザービーム５’により溶接し、肉厚方向
に垂直な溶接部７’を形成した場合には、衝撃により生
じたクラックは、すべて溶接部７’に伝播する。従っ
て、溶接部７’の靭性値は、その材質によって左右さ
れ、母材に比べて劣化することが避けられない。That is, one of the criteria for the toughness is the impact value in the Charpy impact test, which depends on how the crack propagates when an impact is applied to the weld.
Toughness is affected. According to the conventional method, as shown in FIG. 6, a butt end 2 perpendicular to the wall thickness direction of the tubular molded body 1a.
When a'and 2b 'are welded by the laser beam 5'to form the welded portion 7'perpendicular to the thickness direction, all cracks generated by the impact propagate to the welded portion 7'. Therefore, the toughness value of the welded portion 7 ′ depends on the material thereof and is inevitably deteriorated as compared with the base material.
【００１５】これに対して、本発明の方法により、図３
に示すように、管状成形体1aの衝合された突き合わせ端
部2a,2b をレーザービーム５により溶接し、肉厚方向に
角度θの傾斜した溶接部７を形成した場合には、衝撃に
より生じたクラックは、溶接部７を通過して母材に伝播
する。従って、溶接部７の靭性値は、母材部とほぼ同じ
になり、劣化することがない。On the other hand, according to the method of the present invention, as shown in FIG.
As shown in Fig. 5, when the abutted butted ends 2a and 2b of the tubular molded body 1a are welded by the laser beam 5 to form the welded portion 7 inclined at the angle θ in the wall thickness direction, it is caused by impact. The cracks propagate through the weld 7 to the base metal. Therefore, the toughness value of the welded portion 7 is almost the same as that of the base metal portion and does not deteriorate.
【００１６】管状成形体1aの突き合わせ端部2a,2b 即ち
溶接部７の傾斜角度および高密度エネルギービーム５の
照射角度は、５〜３０度の範囲内とすることが望まし
い。上記角度が５度未満では、シャルピー衝撃試験にお
いて、衝撃により生じたクラックを十分に母材に伝播さ
せることができず、従って、溶接部の靭性向上効果が低
くなる。一方、上記角度が３０度を超えると、溶接距離
が長くなり過ぎ且つ多量の溶接入熱が必要になるため、
生産性が低下する問題が生ずる。The abutting ends 2a, 2b of the tubular molded body 1a, that is, the inclination angle of the welded portion 7 and the irradiation angle of the high-density energy beam 5 are preferably within the range of 5 to 30 degrees. If the angle is less than 5 degrees, in the Charpy impact test, cracks caused by impact cannot be sufficiently propagated to the base metal, and thus the effect of improving the toughness of the welded portion becomes low. On the other hand, if the angle exceeds 30 degrees, the welding distance becomes too long and a large amount of welding heat input is required.
The problem of reduced productivity arises.
【００１７】高密度エネルギービームの照射により溶接
した溶接部における、溶接金属中の酸素量（Ｏ）と溶接
部の傾斜角度（θ）とは、下記式、 〔Ｏ〕＝≦６×〔θ〕＋３００(ppm) の関係を満たしていることが望ましい。The oxygen amount (O) in the weld metal and the inclination angle (θ) of the weld metal in the welded portion welded by irradiation of the high-density energy beam are expressed by the following equation: [O] = ≦ 6 × [θ] It is desirable to satisfy the relationship of +300 (ppm).
【００１８】図５は、本発明の方法により溶接鋼管を製
造した場合の、溶接部の傾斜角度と溶接金属中の酸素含
有量との関係における、溶接部の靭性を表したグラフで
ある。なお、図中の○印および●印は靭性値であって、
ＱＴ処理（ 950℃×30min 保持後水冷＋ 650℃×30min
保持後空冷）後の溶接部のシャルピー衝撃試験の破面遷
移温度(vTs) に基づき、下記によって評価した。 ○：溶接部のシャルピー衝撃試験の破面遷移温度(vTs)
がー６０℃以下であって靭性が優れている場合 ●：溶接部のシャルピー衝撃試験の破面遷移温度(vTs)
がー６０℃超であって靭性が劣る場合FIG. 5 is a graph showing the toughness of the welded portion in relation to the inclination angle of the welded portion and the oxygen content in the weld metal when the welded steel pipe is manufactured by the method of the present invention. The ○ and ● marks in the figure are toughness values.
QT treatment (950 ℃ × 30min Water cooling after holding + 650 ℃ × 30min
Based on the fracture surface transition temperature (vTs) of the Charpy impact test of the welded part after air cooling after holding), the following evaluation was performed. ○: Fracture surface transition temperature (vTs) of Charpy impact test of weld zone
When the temperature is -60 ° C or less and the toughness is excellent ●: Fracture surface transition temperature (vTs) of Charpy impact test of welded part
When the temperature is over -60 ° C and the toughness is poor
【００１９】図５から、破面遷移温度(vTs) がー６０℃
以下であって優れた靭性を示す領域は、溶接金属中の酸
素量（Ｏ）が、溶接部の傾斜角度（θ）との関係におい
て、（Ｏ）＝≦６×（θ）＋３００(ppm) の関係を満た
していることの望ましいことがわかる。From FIG. 5, the fracture surface transition temperature (vTs) is −60 ° C.
In the following region showing excellent toughness, the oxygen amount (O) in the weld metal is (O) = ≦ 6 × (θ) +300 (ppm) in relation to the inclination angle (θ) of the welded portion. It can be seen that it is desirable to satisfy the relationship.
【００２０】[0020]
【実施例】次に、この発明の方法を、実施例により比較
例と対比しながら更に説明する。表１に示す化学成分組
成を有する、肉厚12mm、外径406mm の３種類の管状成形
体Ａ，Ｂ，Ｃを使用し、図１に示した本発明方法により
溶接鋼管の供試体（以下、本発明供試体という）No. １
〜１９を調製した。また、比較のために、従来方法によ
り溶接鋼管の供試体（比較用供試体という）No. １〜６
を調製した。EXAMPLES Next, the method of the present invention will be further described by way of Examples in comparison with Comparative Examples. Using three types of tubular moldings A, B, and C having the chemical composition shown in Table 1 and having a wall thickness of 12 mm and an outer diameter of 406 mm, a specimen of a welded steel pipe (hereinafter, The present invention specimen) No. 1
~ 19 were prepared. Further, for comparison, specimens of welded steel pipe (referred to as comparative specimens) No. 1 to 6 by the conventional method
Was prepared.
【００２１】[0021]
【表１】 [Table 1]
【００２２】本発明供試体および比較用供試体の各々に
ついて、溶接部の酸素量を調べ、且つ、ＱＴ処理（ 950
℃×30min 保持後水冷＋ 650℃×30min 保持後空冷）を
施した後に溶接部のシャルピー衝撃試験を行い、その破
面遷移温度(vTs) を調べた。表２に、溶接速度、溶接部
の傾斜角度、溶接部の酸素量、破面遷移温度(vTs) およ
びvTs による靭性の評価を示す。なお、靭性の評価は下
記により行った。 ◎：vTs が（ー８０）℃以下であって靭性が極めて良好 ○：vTs が（ー６０）〜（ー８０）℃未満であって靭性
が良好 ×：vTs が（ー６０）℃未満であって靭性が不良With respect to each of the present invention specimen and the comparative specimen, the oxygen content of the welded portion was examined, and the QT treatment (950
After carrying out water cooling after holding at ℃ × 30 min + air cooling after holding at 650 ° C × 30 min), a Charpy impact test of the welded part was performed and the fracture surface transition temperature (vTs) was examined. Table 2 shows the welding speed, the inclination angle of the weld, the oxygen content of the weld, the fracture surface transition temperature (vTs), and the evaluation of the toughness by vTs. The toughness was evaluated as follows. ⊚: vTs is (-80) ° C or less and extremely toughness is good ◯: vTs is (-60) to less than (-80) ° C and toughness is good x: vTs is less than (-60) ° C And poor toughness
【００２３】[0023]
【表２】 [Table 2]
【００２４】表２から明らかなように、本発明供試体N
o. １〜１９は、比較用供試体No. １〜６に比べて、溶
接部の酸素量が少なく、溶接部の靭性に優れており、特
に、溶接金属中の酸素量（Ｏ）と溶接部の傾斜角度
（θ）とが、〔Ｏ〕＝≦６×〔θ〕＋３００(ppm) の関
係を満たす、本発明供試体No. １〜３、No. ６〜８、N
o.11〜14、および、No.17 〜18は、極めて良好な靭性を
示した。これに対して、比較用供試体No. １〜６の靭性
は不良であった。As is apparent from Table 2, the sample N of the present invention
Compared with the comparative specimen Nos. 1 to 6, o. 1 to 19 have less oxygen in the welded portion and are excellent in toughness of the welded portion. The inclination angle (θ) of the part satisfies the relationship of [O] = ≦ 6 × [θ] +300 (ppm), the specimens of the present invention No. 1-3, No. 6-8, N
Nos. 11 to 14 and Nos. 17 to 18 showed extremely good toughness. On the other hand, the comparative specimens Nos. 1 to 6 were poor in toughness.
【００２５】[0025]
【発明の効果】以上述べたように、この発明によれば、
高密度エネルギービーム溶接により溶接鋼管を製造する
に際し、溶接部の靭性に優れた溶接鋼管を製造すること
ができる工業上有用な効果がもたらされる。As described above, according to the present invention,
When producing a welded steel pipe by the high-density energy beam welding, an industrially useful effect that a welded steel pipe having excellent toughness at the welded portion can be produced is brought about.
【図１】この発明の溶接方法の一実施態様を示す概略斜
視図である。FIG. 1 is a schematic perspective view showing an embodiment of a welding method of the present invention.
【図２】図１のＡ−Ａ線部分拡大断面図である。FIG. 2 is a partially enlarged cross-sectional view taken along the line AA of FIG.
【図３】図１のＢ−Ｂ線部分拡大断面図である。3 is a partially enlarged cross-sectional view taken along line BB of FIG.
【図４】成形前の鋼帯の幅方向拡大断面図である。FIG. 4 is an enlarged cross-sectional view in the width direction of a steel strip before forming.
【図５】本発明の方法により溶接鋼管を製造した場合
の、溶接部の傾斜角度と溶接金属中の酸素含有量との関
係における、溶接部の靭性を表したグラフである。FIG. 5 is a graph showing the toughness of the welded portion in the relationship between the inclination angle of the welded portion and the oxygen content in the weld metal when the welded steel pipe is manufactured by the method of the present invention.
【図６】従来法における管状成形体の突き合わせ端部を
示す拡大断面図である。FIG. 6 is an enlarged cross-sectional view showing a butt end of a tubular molded body in a conventional method.
１ 鋼帯 1a 管状成形体 ２ 両側端面 2a 突き合わせ端部 2b 突き合わせ端部 ３ スクイズロール ４ 給電装置 ５ レーザービーム ６ トップロール ７ 溶接部 1 Steel strip 1a Tubular shaped body 2 Both end faces 2a Butt end 2b Butt end 3 Squeeze roll 4 Power supply device 5 Laser beam 6 Top roll 7 Welded part
Claims (3)
成形体の突き合わせ端部を、電気抵抗加熱または高周波
誘導加熱によって予熱し、次いで、前記突き合わせ端部
が予熱された管状成形体をスクイズロールにより加圧し
て、その突き合わせ端部を衝合し、衝合によって形成さ
れた突き合わせ端部の開先線に沿って、高密度エネルギ
ービームを照射し、前記突き合わせ端部を前記高密度エ
ネルギービームにより加熱しそして溶融することにより
溶接する、溶接鋼管の製造方法において、 予め、前記鋼帯の幅方向両側端面を、肉厚方向に互いに
平行な所定角度の傾斜状に形成し、前記両側端面が傾斜
状に形成された鋼帯を前記管状成形体に成形し、前記管
状成形体の肉厚方向に傾斜した突き合わせ端部を予熱し
次いで衝合し、衝合によって形成された前記突き合わせ
端部の傾斜した開先線に沿って、これと同じ傾斜角度で
前記高密度エネルギービームを照射し、前記突き合わせ
端部を溶接することを特徴とする溶接鋼管の製造方法。1. A tubular formed body in which a steel strip is continuously formed into a tubular shape, the butt ends of the tubular shaped body are preheated by electric resistance heating or high frequency induction heating, and then the butt ends are preheated. Is pressed by a squeeze roll, the abutting ends are abutted, and a high-density energy beam is irradiated along the groove line of the abutting ends formed by the abutting, and the abutting ends are high-density. In the method for manufacturing a welded steel pipe, which comprises heating by an energy beam and welding by melting, in the width direction both end surfaces of the steel strip are formed in advance in a slanting shape with a predetermined angle parallel to each other in the thickness direction, A steel strip having an inclined end surface is formed into the tubular molded body, and the butted ends inclined in the wall thickness direction of the tubular molded body are preheated and then abutted, and formed by abutting. Has been along the inclined groove lines of the butt end, irradiating the high density energy beam at the same angle of inclination as this method of manufacturing a welded steel pipe, characterized in that welding the butt end.
傾斜角度、および、前記高密度エネルギービームの照射
角度を、５〜３０度の範囲内とする、請求項１記載の方
法。2. The method according to claim 1, wherein an inclination angle of the butt ends of the tubular molded body and an irradiation angle of the high-density energy beam are within a range of 5 to 30 degrees.
り溶接した溶接部における、溶接金属中の酸素量（Ｏ）
と、前記溶接部の傾斜角度（θ）とが、下記式、 〔Ｏ〕＝≦６×〔θ〕＋３００(ppm) の関係を満たす、請求項１または２記載の方法。3. The amount of oxygen (O) in the weld metal in the welded portion welded by irradiation with the high-density energy beam.
And the inclination angle (θ) of the welded portion satisfy the following equation: [O] = ≦ 6 × [θ] +300 (ppm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07199238A JP3079962B2 (en) | 1995-07-12 | 1995-07-12 | Manufacturing method of welded steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07199238A JP3079962B2 (en) | 1995-07-12 | 1995-07-12 | Manufacturing method of welded steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0924480A true JPH0924480A (en) | 1997-01-28 |
| JP3079962B2 JP3079962B2 (en) | 2000-08-21 |
Family
ID=16404467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07199238A Expired - Fee Related JP3079962B2 (en) | 1995-07-12 | 1995-07-12 | Manufacturing method of welded steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3079962B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4998634B1 (en) * | 2011-03-29 | 2012-08-15 | Ｊｆｅスチール株式会社 | Laser welding method |
| JP4998633B1 (en) * | 2011-03-29 | 2012-08-15 | Ｊｆｅスチール株式会社 | Laser welding method |
| JP5024475B1 (en) * | 2011-03-30 | 2012-09-12 | Ｊｆｅスチール株式会社 | Laser welded steel pipe manufacturing method |
| WO2012132024A1 (en) * | 2011-03-29 | 2012-10-04 | Ｊｆｅスチール株式会社 | Laser welding method |
| WO2012147213A1 (en) * | 2011-04-28 | 2012-11-01 | Ｊｆｅスチール株式会社 | Method for producing laser welded steel pipe |
-
1995
- 1995-07-12 JP JP07199238A patent/JP3079962B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4998634B1 (en) * | 2011-03-29 | 2012-08-15 | Ｊｆｅスチール株式会社 | Laser welding method |
| JP4998633B1 (en) * | 2011-03-29 | 2012-08-15 | Ｊｆｅスチール株式会社 | Laser welding method |
| WO2012132024A1 (en) * | 2011-03-29 | 2012-10-04 | Ｊｆｅスチール株式会社 | Laser welding method |
| US9266195B2 (en) | 2011-03-29 | 2016-02-23 | Jfe Steel Corporation | Laser welding method |
| JP5024475B1 (en) * | 2011-03-30 | 2012-09-12 | Ｊｆｅスチール株式会社 | Laser welded steel pipe manufacturing method |
| WO2012132023A1 (en) * | 2011-03-30 | 2012-10-04 | Ｊｆｅスチール株式会社 | Method for producing laser-welded steel tube |
| US9364921B2 (en) | 2011-03-30 | 2016-06-14 | Jfe Steel Corporation | Method of manufacturing laser welded steel pipe |
| WO2012147213A1 (en) * | 2011-04-28 | 2012-11-01 | Ｊｆｅスチール株式会社 | Method for producing laser welded steel pipe |
| CN103501955A (en) * | 2011-04-28 | 2014-01-08 | 杰富意钢铁株式会社 | Method for producing laser welded steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3079962B2 (en) | 2000-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100228252B1 (en) | The method for producing electric-resistance-welded steel pipe | |
| JP3702216B2 (en) | Manufacturing method for inner and outer surface submerged arc welded steel pipes with excellent seam weld toughness | |
| JP3079962B2 (en) | Manufacturing method of welded steel pipe | |
| JP2650558B2 (en) | Manufacturing method of high workability welded steel pipe | |
| JP2001287061A (en) | Method of manufacturing welded pipe of martensite-based stainless steel | |
| JP3149754B2 (en) | Method for producing carbon steel pipe excellent in toughness by high energy density beam welding | |
| WO1996003249A1 (en) | Method of manufacturing laser welded pipes and apparatus for manufacturing the same | |
| JPS59101293A (en) | Production of welded pipe | |
| JPH09168878A (en) | Manufacture of duplex stainless steel welded tube | |
| JP3134706B2 (en) | Manufacturing method of welded steel pipe | |
| JPH08174249A (en) | Manufacture of welded steel pipe | |
| JP3209061B2 (en) | Method for producing carbon steel pipe excellent in toughness by high energy density beam welding | |
| JPH07303916A (en) | Welding method for tube manufacturing under multiple heat source | |
| JP2778287B2 (en) | Laser pipe welding method | |
| JPH08155665A (en) | Laser beam welding method of ferritic stainless steel | |
| JP4586515B2 (en) | Welded steel pipe with secondary workability comparable to that of the base metal in the welded part and method for producing the same | |
| JP3360621B2 (en) | Manufacturing method of welded steel pipe by high energy beam | |
| JPH1058161A (en) | Welded steel tube and its manufacture | |
| JP3166643B2 (en) | Laser welded pipe manufacturing apparatus and laser welded pipe manufacturing method | |
| JPH1099984A (en) | Manufacture of two-phase stainless steel welded tube | |
| JPH0581327B2 (en) | ||
| JPH06170569A (en) | Composite heat source welding method for tube making | |
| JPH04258390A (en) | Manufacture of ferritic stainless steel welded tube | |
| JPH05131285A (en) | Manufacture of welded tube | |
| JPH09174267A (en) | Manufacture of welded steel tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080623 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090623 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100623 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110623 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120623 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120623 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130623 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140623 Year of fee payment: 14 |
|
| LAPS | Cancellation because of no payment of annual fees |