JPH0523867A - Welding defect preventing method for electric resistance welded tube weld zone - Google Patents
Welding defect preventing method for electric resistance welded tube weld zoneInfo
- Publication number
- JPH0523867A JPH0523867A JP3179662A JP17966291A JPH0523867A JP H0523867 A JPH0523867 A JP H0523867A JP 3179662 A JP3179662 A JP 3179662A JP 17966291 A JP17966291 A JP 17966291A JP H0523867 A JPH0523867 A JP H0523867A
- Authority
- JP
- Japan
- Prior art keywords
- electric resistance
- weld zone
- resistance welded
- welding
- weld
- 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.)
- Withdrawn
Links
Landscapes
- Laser Beam Processing (AREA)
- Arc Welding In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電縫鋼管の製造におい
てその溶接部の溶接欠陥を効果的に防止する方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively preventing welding defects in a welded portion in the production of electric resistance welded steel pipe.
【０００２】[0002]
【従来の技術】周知のごとく電縫鋼管の製造において
は、電気抵抗又は誘導により溶接すべき製管材（鋼帯）
のエッジ（端部）を加熱し、次いでスクイズロールによ
り加圧圧接（溶接）する。このようにして製造した電縫
鋼管の溶接部には、しばしば酸化物の残留による溶接欠
陥が発生し、靭性、加工性をも劣化させる等の欠点があ
る。2. Description of the Related Art As is well known, in the production of ERW steel pipe, a pipe material (steel strip) to be welded by electric resistance or induction.
The edge (end) is heated and then pressure-welded (welded) with a squeeze roll. The welded portion of the electric resistance welded steel pipe manufactured as described above often has welding defects due to residual oxides, and has the drawback of degrading toughness and workability.
【０００３】電縫鋼管の溶接部には酸化物が発生し易
く、この酸化物が溶接部に残留すると溶接欠陥となる。
この溶接欠陥を低減するために、例えば特開昭５２−８
０２６０号公報或いは特開昭５２−７６２６５号公報に
記載の技術が知られている。即ち、前者は、電縫鋼管の
製造に際し、溶接部位に酸素ガスを噴射することによ
り、加熱されている圧接されるべき端部をより高温に
し、その端部の液状酸化物を排出し易い状態にして、そ
の後の加圧圧接により排出し、溶接後の溶接（圧接）部
に酸化物が残留しにくくして、溶接欠陥を低減するもの
である。また後者は、電縫鋼管の製造に際し、溶接部を
ガスシールドすることにより酸素濃度を低くし、酸化物
の発生量そのものを低減することによって、溶接欠陥を
低減するものである。Oxides are apt to be generated in the welded part of the electric resistance welded steel pipe, and if the oxide remains in the welded part, it causes a welding defect.
In order to reduce this welding defect, for example, JP-A-52-8
The technology described in JP-A-0260 or JP-A-52-76265 is known. That is, the former is a state in which, at the time of manufacturing an electric resistance welded steel pipe, by injecting oxygen gas to the welded portion, the end portion to be pressure-welded heated to a higher temperature, and the liquid oxide at the end portion is easily discharged. Then, the oxide is discharged by the subsequent pressure welding, and the oxide is less likely to remain in the welded (pressure welded) portion after welding, thereby reducing welding defects. In the latter case, when manufacturing an electric resistance welded steel pipe, the welded portion is gas-shielded to reduce the oxygen concentration, and the amount of oxide itself is reduced to reduce welding defects.
【０００４】しかしながら、このような方法において
は、次のような問題がある。即ち、前者については、酸
素ガスの噴射によって酸化物の発生量そのものが逆に増
加しているため、溶接欠陥の低減には限界があり、充分
な効果が得られないという不都合を有していた。また後
者においては、酸素ガス噴射による溶接部に酸化物が残
留しにくくする効果を併用できないため、溶接欠陥の低
減には限界があり、充分な効果が得られないという不都
合を有していた。However, such a method has the following problems. That is, in the former case, since the amount of oxide itself is increased by the injection of oxygen gas, there is a limit to the reduction of welding defects and there is a disadvantage that a sufficient effect cannot be obtained. . Further, in the latter case, since the effect of making oxides less likely to remain in the welded portion due to the injection of oxygen gas cannot be used together, there is a limit to the reduction of welding defects and there is a disadvantage that a sufficient effect cannot be obtained.
【０００５】[0005]
【発明が解決しようとする課題】電縫鋼管を製造する
際、電縫鋼管の溶接部の溶接欠陥を低減する方法が種々
提案されているが、いずれも効果が不十分であり、本発
明はこの問題を有利に解消する、電縫鋼管溶接部の溶接
欠陥防止方法を提供するものである。Various methods have been proposed for reducing welding defects in the welded portion of the electric resistance welded steel pipe when manufacturing the electric resistance welded steel pipe, but none of them are sufficiently effective. It is intended to provide a method for preventing welding defects in an electric resistance welded steel pipe welded portion, which advantageously solves this problem.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、溶接欠陥
の極限的低減を目的として、溶接部酸素濃度と溶接部温
度と溶接欠陥量の関係について、溶接実験、研究を行っ
た結果、次のような知見を得た。図１は、溶接部酸素濃
度と、溶接欠陥発生率の関係を示すグラフである。酸素
濃度が高いと溶接欠陥が多発し、溶接部品質が劣化す
る。酸素濃度が低いと溶接欠陥が減少し、溶接部品質が
向上する。また、レーザービーム又はプラズマア−クの
照射によって、溶接部温度を高めると、さらに溶接欠陥
発生率が低下し、溶接部品質が向上する。Means for Solving the Problems The present inventors have conducted a welding experiment and a study on the relationship between the weld oxygen concentration and the weld temperature and the amount of weld defects for the purpose of limiting the weld defects to a minimum. The following findings were obtained. FIG. 1 is a graph showing the relationship between the weld oxygen concentration and the welding defect occurrence rate. If the oxygen concentration is high, welding defects frequently occur and the quality of the welded portion deteriorates. A low oxygen concentration reduces weld defects and improves weld quality. Further, if the temperature of the welded portion is raised by the irradiation of the laser beam or the plasma arc, the occurrence rate of weld defects is further lowered and the quality of the welded portion is improved.
【０００７】図２は、溶接部温度と、溶接欠陥発生率の
関係を示すグラフである。溶接部温度が低いと溶接欠陥
が多発し、溶接部品質が劣化する。レーザービーム又は
プラズマアークの照射によって、溶接部温度を高める
と、溶接欠陥が減少し、溶接部品質が向上する。また、
ガスシールドすることにより、溶接部の酸素濃度を低く
すると、さらに溶接欠陥発生率が低下し、溶接部品質が
向上する。FIG. 2 is a graph showing the relationship between the weld temperature and the weld defect occurrence rate. If the temperature of the weld zone is low, welding defects frequently occur and the quality of the weld zone deteriorates. Increasing the weld temperature by irradiation with a laser beam or plasma arc reduces weld defects and improves weld quality. Also,
By reducing the oxygen concentration in the welded portion by gas shielding, the weld defect occurrence rate is further reduced and the welded portion quality is improved.
【０００８】以上の図１、図２の知見から、溶接欠陥率
を低減し、溶接部品質を極限まで高めるためには、溶接
部酸素濃度を低くすることと、溶接部温度を高めること
を、同時に実現することが重要であることが判る。そし
て、この溶接部酸素濃度低減と、溶接部温度上昇の同時
達成は、ガスシールドとレーザービーム又はプラズマア
ークの照射を同時に行うことで、達成できることが判明
した。From the findings of FIGS. 1 and 2 described above, in order to reduce the weld defect rate and maximize the weld quality, it is necessary to reduce the weld oxygen concentration and increase the weld temperature. It turns out that it is important to realize at the same time. It has been found that the simultaneous reduction of the oxygen concentration in the weld and the increase in the temperature of the weld can be achieved by simultaneously irradiating the gas shield and the laser beam or the plasma arc.
【０００９】即ち本発明は、電縫鋼管の製造方法におい
て、溶接部をガスシールドすることにより酸素濃度を低
くし、酸化物の発生量そのものを低減し、且つ高周波加
熱中の溶接部位に、レーザービーム又はプラズマアーク
を照射することにより、加熱されている圧接されるべき
端部をより高温にし、その端部の液状酸化物を排出し易
い状態にして、その後の加圧圧接により排出し、溶接後
の溶接（圧接）部に酸化物が残留しにくくして、溶接欠
陥を著しく低減し、良好な電縫溶接部の靭性、加工性を
有する電縫鋼管を製造することにある。That is, according to the present invention, in the method for producing an electric resistance welded steel pipe, the welded portion is gas-shielded to reduce the oxygen concentration, the amount of oxide generated itself is reduced, and the laser is applied to the welded portion during high frequency heating. By irradiating with a beam or plasma arc, the end to be pressure-welded is heated to a higher temperature so that the liquid oxide at the end can be easily discharged, and then discharged by pressure-welding and welding. The purpose of the present invention is to make it difficult for oxides to remain in the subsequent welded (pressure welded) portion, to significantly reduce welding defects, and to produce an electric resistance welded steel pipe having good toughness and workability of the electric resistance welded portion.
【００１０】図３は本発明に使用する電縫鋼管製造装置
の一例を示す。図において、高周波加熱される製管材の
エッジ（溶接部）５を、ガスシールド・ボックス１で覆
いガス（例えばアルゴンガス、窒素ガス）を噴射してシ
ールドし、レーザービーム又はプラズマアークを照射口
２から照射する。３はコンタクトチップ、４はスクイズ
ロールである。FIG. 3 shows an example of an electric resistance welded steel pipe manufacturing apparatus used in the present invention. In the figure, an edge (welded portion) 5 of a pipe material to be subjected to high frequency heating is covered with a gas shield box 1 to inject gas (for example, argon gas, nitrogen gas) to shield the laser beam or plasma arc, and an irradiation port 2 Irradiate from. 3 is a contact tip and 4 is a squeeze roll.
【００１１】次に本発明の実施例を表１に示す。実施例
から明らかな通り、溶接部をガスシールドし、レーザー
ビーム又はプラズマアークを照射して高温にすることを
併合することにより、電縫溶接部に酸化物を残留しにく
くさせ、溶接欠陥発生率を著しく低下させ、製品歩留ま
りを向上させるとともに、靭性、加工性をも向上させる
という優れた効果が得られることが分かる。Next, Table 1 shows examples of the present invention. As is clear from the examples, by combining the gas shield of the weld and irradiating it with a laser beam or a plasma arc to raise the temperature, oxides are less likely to remain in the electric resistance weld and the weld defect occurrence rate. It is understood that the excellent effect of improving the toughness and workability as well as significantly lowering the product yield and improving the product yield is obtained.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【発明の効果】以上説明したごとく本発明方法にあって
は、溶接欠陥率が非常に低い、極限的高品質溶接部が安
定して得られるため、溶接部の靭性、加工性は非常に優
れており、冷間での厳しい加工に充分耐える等、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, since extremely high quality welds having extremely low weld defect rate can be stably obtained, the toughness and workability of the welds are excellent. It has excellent effects such as being able to withstand severe cold working.
【図１】溶接部酸素濃度と、溶接欠陥率の関係を示す説
明図である。FIG. 1 is an explanatory diagram showing a relationship between a weld oxygen concentration and a welding defect rate.
【図２】溶接部温度と、溶接欠陥率との関係を示す説明
図である。FIG. 2 is an explanatory diagram showing a relationship between a weld temperature and a welding defect rate.
【図３】本発明に用いる、ガスシールド装置付き、レー
ザービーム又はプラズマアーク照射装置付き高周波電縫
鋼管溶接装置の例を示す説明図である。FIG. 3 is an explanatory view showing an example of a high-frequency electric resistance welded steel pipe welding device with a gas shield device and with a laser beam or plasma arc irradiation device used in the present invention.
１ ガスシールド・ボックス ２ レーザービーム又はプラズマアーク照射口 ３ コンタクトチップ又はワークコイル ４ スクイズロール ５ エッジ 1 gas shield box 2 laser beam or plasma arc irradiation port 3 contact tip or work coil 4 squeeze roll 5 edge
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２３Ｋ 37/00 ３０１ Ａ 7011−4Ｅ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location B23K 37/00 301 A 7011-4E
Claims (1)
に溶接部をガスシールドして酸素濃度を低くし、酸化物
の発生量を低減し、且つ高周波加熱中の溶接部位に、レ
ーザービーム又はプラズマアークを照射することを特徴
とする、電縫鋼管の製造方法。What is claimed is: 1. When manufacturing an electric resistance welded steel pipe, the welded portion is gas shielded at the time of welding (pressure welding) to reduce the oxygen concentration, reduce the amount of oxides generated, and reduce the amount of oxides generated during high frequency heating. A method for producing an electric resistance welded steel pipe, which comprises irradiating a welded portion with a laser beam or a plasma arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3179662A JPH0523867A (en) | 1991-07-19 | 1991-07-19 | Welding defect preventing method for electric resistance welded tube weld zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3179662A JPH0523867A (en) | 1991-07-19 | 1991-07-19 | Welding defect preventing method for electric resistance welded tube weld zone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0523867A true JPH0523867A (en) | 1993-02-02 |
Family
ID=16069689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3179662A Withdrawn JPH0523867A (en) | 1991-07-19 | 1991-07-19 | Welding defect preventing method for electric resistance welded tube weld zone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0523867A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699773A1 (en) * | 1994-08-05 | 1996-03-06 | Nkk Corporation | Method for manufacturing electric-resistance-welded steel pipe |
| JP2006175514A (en) * | 2004-11-24 | 2006-07-06 | Jfe Steel Kk | Electric resistance welded tube having reduced defect in weld zone and its production method |
| WO2014033931A1 (en) * | 2012-08-31 | 2014-03-06 | 新日鐵住金株式会社 | Method for producing plasma-shielded electric resistance welded steel pipe |
| JP6458907B1 (en) * | 2018-01-22 | 2019-01-30 | 新日鐵住金株式会社 | ERW steel pipe manufacturing apparatus and ERW steel pipe manufacturing method |
-
1991
- 1991-07-19 JP JP3179662A patent/JPH0523867A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699773A1 (en) * | 1994-08-05 | 1996-03-06 | Nkk Corporation | Method for manufacturing electric-resistance-welded steel pipe |
| JP2006175514A (en) * | 2004-11-24 | 2006-07-06 | Jfe Steel Kk | Electric resistance welded tube having reduced defect in weld zone and its production method |
| WO2014033931A1 (en) * | 2012-08-31 | 2014-03-06 | 新日鐵住金株式会社 | Method for producing plasma-shielded electric resistance welded steel pipe |
| JP5664835B2 (en) * | 2012-08-31 | 2015-02-04 | 新日鐵住金株式会社 | Method for manufacturing plasma shielded electric resistance welded steel pipe |
| JP6458907B1 (en) * | 2018-01-22 | 2019-01-30 | 新日鐵住金株式会社 | ERW steel pipe manufacturing apparatus and ERW steel pipe manufacturing method |
| WO2019142359A1 (en) * | 2018-01-22 | 2019-07-25 | 日本製鉄株式会社 | Electric resistance welded steel pipe manufacturing device and electric resistance welded steel pipe manufacturing method |
| CN111372712A (en) * | 2018-01-22 | 2020-07-03 | 日本制铁株式会社 | Electric resistance welded steel pipe manufacturing apparatus and electric resistance welded steel pipe manufacturing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981008 |