JPS623879A - Production for seam welded steel pipe - Google Patents
Production for seam welded steel pipeInfo
- Publication number
- JPS623879A JPS623879A JP14341585A JP14341585A JPS623879A JP S623879 A JPS623879 A JP S623879A JP 14341585 A JP14341585 A JP 14341585A JP 14341585 A JP14341585 A JP 14341585A JP S623879 A JPS623879 A JP S623879A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- steel pipe
- face
- opposite side
- welded steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電縫鋼管の溶接部の靭性、特に低温靭性を改善
し得る電縫鋼管の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an ERW steel pipe that can improve the toughness of the welded portion of the ERW steel pipe, particularly the low temperature toughness.
電縫鋼管の製造は、一般に、帯鋼が複数のブレークダウ
ンロール、サイドロール、フィンパスロール等からなる
成形ロール群に連続的に送給されて、まずＵ字形に成形
された後に略円形のオープンパイプに曲成され、そのオ
ープンパイプが溶接機へ送給され、ここでその対向側端
面に誘導コイル方式又はサーマツール方式により高周波
電流が通じられて加熱された後、スクイズロールにより
圧接されることによってなされる。Generally, in the production of ERW steel pipes, a steel strip is continuously fed to a group of forming rolls consisting of a plurality of breakdown rolls, side rolls, fin pass rolls, etc., and is first formed into a U-shape, and then into a substantially circular shape. The open pipe is bent into an open pipe, and the open pipe is sent to a welding machine, where a high-frequency current is passed through the opposite end face using an induction coil method or a therma tool method to heat it, and then it is pressed together with a squeeze roll. done by
このようにして製造された電ｔａ鋼管の溶接部は、その
凝固時にスクイズロールによる加圧を受けるためその中
央にフェライトバンドと称される軟化層が形成された靭
性の低いベイナイト組織となっている。そのフェライト
バンド部は母材よりも成分濃度が低下しており、特にＣ
，Ｍｎについては著しい。The welded parts of electric steel pipes manufactured in this way are pressurized by squeeze rolls during solidification, resulting in a bainite structure with low toughness in which a softened layer called a ferrite band is formed in the center. . The ferrite band has a lower component concentration than the base material, especially C
, Mn is remarkable.
そして、上記電Ｕ鋼管のシャルピー試験を行った場合に
は、歪がフェライトバンド部に集中し、容易に脆性破壊
に移行するようになる。When a Charpy test is performed on the above electric U steel pipe, strain concentrates in the ferrite band portion, easily leading to brittle fracture.
電縫鋼管の用途として、電ｈｌ＆ｖｉ管がサブマージア
ーク熔接鋼管或いはシームレス鋼管に比較して安価であ
ることが主要因となって最近では高級ラインパイプ、ケ
ーシングへの通用が進んでいる。Recently, electric resistance welded steel pipes have been increasingly used in high-grade line pipes and casings, mainly because electric resistance welded steel pipes are cheaper than submerged arc welded steel pipes or seamless steel pipes.
しかしながら、この通用にはその使用環境のために低温
靭性が最も問題となる。したがって、溶接部の低温靭性
を母材と同程度とすべく、素材たる帯鋼として靭性改善
に有効な炭化物形成元素であるＮｂ、 Ｖ、 Ｔｉ等
を適量添加したものを使用し、また電縫鋼管を焼準処理
したのち急冷する方法が提案されている （特開昭５９
−１５３８３９号）。これにより溶接部は微細かつ均一
なフェライト・パーライト組織となり、破面遷移温度と
して一３２℃以下が達成されている。ちなみに通常の成
分の電縫鋼管を単に焼準処理して溶接部の組織をフェラ
イト・パーライト組織としても破面遷移温度はθ℃〜−
２０℃が限界であり、明らかに用途に不通であった。However, for this purpose, low-temperature toughness is the most important problem due to the environment in which it is used. Therefore, in order to make the low-temperature toughness of the welded part the same as that of the base metal, we use steel strips containing appropriate amounts of carbide-forming elements such as Nb, V, and Ti, which are effective in improving toughness, and also use electric resistance welding. A method has been proposed in which steel pipes are normalized and then rapidly cooled.
-153839). As a result, the welded part has a fine and uniform ferrite-pearlite structure, and a fracture surface transition temperature of -32°C or less has been achieved. By the way, even if an ERW steel pipe with normal composition is simply normalized and the structure of the welded part is ferrite/pearlite, the fracture surface transition temperature will be θ℃ ~ -
The temperature limit was 20°C, and it was clearly impractical for use.
〔発明が解決しようとする問題点〕
しかし、破面遷移温度として一３２℃以下を達成できて
も、電縫鋼管がサブマージアーク溶接鋼管等と同等の評
価を得るためには、更に低温靭性を根本的に改善すべく
応力集中の生ずる軟質部分の発生を防止することが必要
である。このため、仮にＮｂ、 Ｖ、 Ｔｉ等を含有
する帯鋼を使用して電縫鋼管を製造し、これを焼準して
Ｎｂ等の合金元素を母材からフェライトバンドへ拡散さ
せ、軟質部分を消去させる方法が考えられるが、この方
法の場合は焼準に長時間を要するため能率低下が著しく
、またコストアップとなり、電ｈ１鋼管を高級ラインパ
イプ、ケーシング等に通用する本来のメリットが少なく
なる。[Problems to be solved by the invention] However, even if it is possible to achieve a fracture surface transition temperature of -32°C or lower, in order for ERW steel pipes to achieve the same evaluation as submerged arc welded steel pipes, it is necessary to further improve the low-temperature toughness. In order to fundamentally improve the situation, it is necessary to prevent the occurrence of soft parts where stress concentration occurs. For this reason, it is assumed that ERW steel pipes are manufactured using strip steel containing Nb, V, Ti, etc., and this is normalized to diffuse alloying elements such as Nb from the base material into the ferrite band, thereby removing the soft parts. There is a method to erase the heat, but this method requires a long time to normalize, resulting in a significant drop in efficiency and an increase in cost, which diminishes the original benefits of using electric H1 steel pipes for high-grade line pipes, casings, etc. .
本発明は斯かる事情に鑑みてなされたものであり、例え
ばＣ，Ｓｉ＋ Ｍｎ、 Ｃｒ、 、Ｎｉ、 Ｍｏ、
ｖ、 Ｔｉ、 Ｎｂ。The present invention has been made in view of such circumstances, and includes, for example, C, Si+ Mn, Cr, , Ni, Mo,
v, Ti, Nb.
Ｂ、Ｃｕ等のうち少なくとも１種以上を母材よりも多く
含有するように成分設計した消耗型の溶接ワイヤを使用
し、高周波加熱されているオープンパイプの電縫鋼管溶
接部に相当する部分にガスシールドアーク溶接を行うこ
とにより、溶接にて成分低下が生じる上記溶接部の全域
を母材と同等の硬度にして軟質部分の発生を防止する電
縫鋼管の製造方法を提供することを目的とする。Using a consumable welding wire whose composition is designed to contain at least one of B, Cu, etc. in a larger amount than the base metal, welding is applied to the part corresponding to the welded part of the ERW steel pipe of the open pipe that is heated by high frequency. The purpose of the present invention is to provide a method for producing an electric resistance welded steel pipe in which the entire area of the welded part where the components are degraded during welding is made as hard as the base metal by performing gas-shielded arc welding, thereby preventing the generation of soft parts. do.
本発明に係る電縫鋼管の製造方法は、帯鋼の側端面同士
を対向させるべくこれを曲成してオープンパイプとし、
該オープンパイプの対向側端部に高周波電流を通じて加
熱、溶融し、然る後両側方より加圧して電縫鋼管を製造
する方法において、前記対向側端部が収束する位置に対
応させて、消耗電極を使用するガスシールドアーク溶接
装置を設け、対向側端部の収束位置近傍に、前記消耗電
極の先端を溶融してなる溶滴を添加することを特徴とす
る。The method for manufacturing an electric resistance welded steel pipe according to the present invention includes bending a steel band so that its side end surfaces face each other to form an open pipe;
In a method of manufacturing an electric resistance welded steel pipe by heating and melting the opposing ends of the open pipe by applying high-frequency current and applying pressure from both sides at the rear, wear and tear is caused by A gas-shielded arc welding device using an electrode is provided, and a droplet formed by melting the tip of the consumable electrode is added near the convergence position of the opposite end.
以下本発明方法をその実施状態を示す図面に基づいて詳
細に説明する。第１図は本発明方法を用いた電縫鋼管製
造ラインを示す模式的平面図であり、第２図は本発明の
実施状態を模式的に示す縮断面図である。図示しない練
剤装置でその両側縁が溶接に適する面に仕上げられた帯
鋼ＳＴは白抜矢符方向に送給されてブレークダウンロー
ル１２ａ、１２ｂ及び１３ａ、１３ｂ並びにサイドロー
ル３ｆ、８ｒ、９Ｌ９ｒ及び１０１！ 、 １０ｒによ
ってＵ字形に成形される。Hereinafter, the method of the present invention will be explained in detail based on the drawings showing its implementation state. FIG. 1 is a schematic plan view showing an electric resistance welded steel pipe manufacturing line using the method of the present invention, and FIG. 2 is a reduced cross-sectional view schematically showing a state in which the present invention is implemented. The steel strip ST, whose both sides have been finished with a surface suitable for welding using a mixing device (not shown), is fed in the direction of the white arrow to the breakdown rolls 12a, 12b, 13a, 13b and side rolls 3f, 8r, 9L9r. and 101! , 10r into a U-shape.
そして上下に対設されたフィンバスロール６．７（図に
は上方のロールのみを表しである）更にはこのフィンバ
スロール６．７間の最終のサイドロール１１ｊ２．ｌｌ
ｒによって略円形に成形されてオープンパイプＯＰとな
り、また上方のフィンバスロールが有するフィンプレー
トによって対向する両縁が正確に案内されて誘導加熱コ
イル４へ送給される。Further, the final side roll 11j2 between the fin bath rolls 6.7 (only the upper roll is shown in the figure) which are arranged vertically opposite each other. ll
r to form a substantially circular shape to become an open pipe OP, and both opposing edges are accurately guided by the fin plates of the upper fin bath roll and fed to the induction heating coil 4.
この誘導加熱コイル４には高周波電源３から高周波電流
が給電されるようになっており、ここに供給されたオー
プンパイプＯＰには誘導電流が発生し、この誘導電流に
よって対向側端面１４７！、 １４ｒは加熱。This induction heating coil 4 is supplied with a high frequency current from the high frequency power source 3, and an induced current is generated in the open pipe OP supplied here, and this induced current causes the opposite end face 147! , 14r is heated.
溶融される。そしてオープンパイプＯＰは然る後側方よ
り押圧されるスクイズロール５１．５ｒにて対向側端面
１４ Ｉ！、 １４ｒの間隔が狭くせしめられつつ、ま
た対向側端面１４１ 、１４ｒの溶融液部が誘導加熱コ
イル４からの電磁力により攪拌されつつ溶接装置２０へ
送給される。melted. Then, the open pipe OP is pressed against the opposite end surface 14 I! by a squeeze roll 51.5r that is pressed from the rear side. , 14r are narrowed, and the molten liquid portions on the opposing end surfaces 141 and 14r are fed to the welding device 20 while being stirred by the electromagnetic force from the induction heating coil 4.
溶接装置２０は消耗電極式ガスシールドアーク溶接方式
のものであり、上記対向側端面１４ ｊ！ 、 １４ｒ
の間隔がゼロとなる位置、つまり対向側端面１４１゜１
４ｒが収束する位置Ｖ点（正確にはスクイズロールセン
ターより１０〜５０龍上流側の位置）の上方に配設され
たトーチ２１を有し、そのトーチ２１には溶接ワイヤ２
２が所要の速度で供給され、またシールドガスが所定量
供給されるようになっている。溶接ワイヤ２２は、Ｃｒ
３＋、 Ｍｒ＋＋ Ｃｒ＋ Ｎ＋＋ Ｍｏ、 Ｖ、
Ｔ＋。The welding device 20 is of a consumable electrode type gas-shielded arc welding type, and the opposite end surface 14 j! , 14r
The position where the distance between is zero, that is, the opposite end face 141°1
4r converges at point V (to be exact, 10 to 50 degrees upstream from the squeeze roll center).
2 is supplied at a required speed, and a predetermined amount of shielding gas is supplied. The welding wire 22 is made of Cr
3+, Mr++ Cr+ N++ Mo, V,
T+.
Ｎｂ、 Ｂ、 Ｃｕ等のうち少なくとも１種以上を母
材より多く含有する組成のソリッドタイプのものを使用
する。これによりフェライトバンドの生成が抑制される
。なお上記のガスシールドタイプのアーク溶接方式とし
て炭酸ガスアーク溶接法、 ＭＩＧ熔接法、ＭＡＧト
ーチ溶接法を使用する。A solid type material having a composition containing at least one of Nb, B, Cu, etc. in a larger amount than the base material is used. This suppresses the generation of ferrite bands. Note that the carbon dioxide arc welding method, MIG welding method, and MAG torch welding method are used as the above-mentioned gas shield type arc welding method.
そして、シールドガスを使用する理由は溶滴移行を安定
化させるためである。例えばＳＡＷ法による場合には使
用するフラフクスにより非金属介在物の溶接部への侵入
を回避できず、またＴＩＧ熔接法による場合は溶滴移行
が断続的であり、また電縫鋼管の製造速度に適合できな
い。なおソリッドタイプの溶接ワイヤを使用するのは、
上述のＳＡＷ法による場合に回避できないフラックスを
原因とする非金属介在物の溶接部への侵入を防止するた
めである。The reason for using the shielding gas is to stabilize droplet transfer. For example, when using the SAW method, the intrusion of non-metallic inclusions into the welded part cannot be avoided due to the flux used, and when using the TIG welding method, droplet transfer is intermittent, and the manufacturing speed of ERW steel pipes is limited. Not suitable. When using solid type welding wire,
This is to prevent nonmetallic inclusions from entering the welded portion due to flux, which cannot be avoided when using the above-mentioned SAW method.
そして、トーチ２１へ供給された溶接ワイヤ２２の先端
は溶融されて溶滴となり、この溶滴はトーチ２１下方の
前記収束位置Ｖ点における攪拌されている対向側端面１
４β、１４ｒの溶融液部へ連続的に落下して攪拌混合さ
れる。Then, the tip of the welding wire 22 supplied to the torch 21 is melted and becomes a droplet, and this droplet is transferred to the opposite end surface 1 which is being stirred at the convergence point V below the torch 21.
4β and 14r are continuously dropped into the molten liquid part and stirred and mixed.
その後、オープンパイプＯＰはスクイズロール５ｉ。After that, the open pipe OP is squeeze roll 5i.
５ｒ間にて対向側端面１４７！、 １４ｒの攪拌混合部
が押圧されて電縫鋼管Ｐとなる。このように製造された
電縫鋼管Ｐの溶接部は母材より高成分の溶接ワイヤを使
用することにより母材、に対して濃度低下とならず、管
全長に亘ってフェライトバンドの生成がない。Opposite end face 147 between 5r! , 14r is pressed to form the electric resistance welded steel pipe P. By using a welding wire with a higher composition than the base metal, the welded part of the ERW steel pipe P manufactured in this way does not reduce the concentration of the base metal, and there is no formation of ferrite bands over the entire length of the pipe. .
従って、本発明により製造した電ｙｌ鋼管Ｐは高級ライ
ンパイプ、ケーシングへの通用が可能である。Therefore, the electric steel pipe P manufactured according to the present invention can be used in high-grade line pipes and casings.
次に低合金系の電縫鋼管を製造した場合の実施例につき
説明する。第１表はその場合の製造条件及び試験結果を
まとめた表であり、本発明方法により低合金系の電縫鋼
管を製造した場合のそれらを実施例１〜２１に示してい
る。比較のために溶接ワイヤの組成が母材のそれと略同
−のものを使用したときのそれらを比較例１．２に、ま
た従来方法により製造したときのそれらを従来例１〜６
に併せて示している。製造条件としては肉厚：６．５１
１１、幅： １５３ ｓｍの熱延コイルを肉厚：１３，
７ｍ、外径： ５０．８ｍｍの電縫鋼管に成形すべく、
溶接ワイヤの直径： １．２ ｔｍ、シールドガス：１
００％アルゴンガス、高周波電源の周波数： ３００
ｋ）ｌｚ 、 ７８融温度＝１４５０℃（スクイズロー
ル間の中央を二色温度針にて測定）、製造速度： １５
ｍ／分とした。そして試験に際してすべての電縫鋼管を
焼準温度：９５０℃、焼準温度での保持時間：１０秒、
８００°Ｃから５００’ｃまでの冷却時間；５０秒で熱
処理を行い、表中のフェライトハンド硬度１１ｖ （１
ｋｇ） 、 ＩＩＡＺ部硬度１１ｖ（１ｋｇ）は夫々
フェライトハンド中央部の硬度、フェライトハンド中央
より０ 、２１１ ％！Ｉれた位置の硬度を示し、また
吸収エネルギーｖＥ −４６℃（ｋｇｍ）の値は２ｍｍ
Ｖ、２サブサイズによる一４６℃での試験結果であり、
各試験条件で２０本電縫鋼管を製造したもののなかでの
最低値を示す。なお、表中のＣｅｑ （χ）は炭素当量
であり、Ｃｅｑ＝Ｃ＋１／６ Ｍｎ＋ １／２４ Ｓｉ
＋ １／４０ Ｎｉ＋１１５ Ｃｒ＋１／４ Ｍｏ＋
１／１４ Ｖを用いた。Next, an example in which a low-alloy electric resistance welded steel pipe is manufactured will be described. Table 1 is a table summarizing the manufacturing conditions and test results in that case, and Examples 1 to 21 show them when low alloy electric resistance welded steel pipes were manufactured by the method of the present invention. For comparison, Comparative Example 1.2 shows welding wires whose composition is approximately the same as that of the base metal, and Conventional Examples 1 to 6 show those produced by the conventional method.
It is also shown here. The manufacturing conditions are wall thickness: 6.51
11, Width: 153 sm hot rolled coil Wall thickness: 13,
To form into a 7m, outer diameter: 50.8mm ERW steel pipe,
Welding wire diameter: 1.2 tm, shielding gas: 1
00% argon gas, frequency of high frequency power supply: 300
k) lz, 78 melting temperature = 1450°C (measured with a two-color temperature needle at the center between squeeze rolls), production speed: 15
m/min. During the test, all ERW steel pipes were tested at a normalizing temperature of 950°C, a holding time at the normalizing temperature of 10 seconds,
Cooling time from 800°C to 500'c: Heat treatment is performed for 50 seconds, and the ferrite hand hardness in the table is 11v (1
kg), IIAZ part hardness 11V (1kg) is the hardness of the ferrite hand center, respectively, 0 and 211% from the ferrite hand center! The value of absorbed energy vE -46℃ (kgm) is 2mm.
V, 2 subsize test results at -46°C,
This is the lowest value among 20 ERW steel pipes manufactured under each test condition. In addition, Ceq (χ) in the table is carbon equivalent, Ceq=C+1/6 Mn+ 1/24 Si
+ 1/40 Ni+115 Cr+1/4 Mo+
1/14 V was used.
この表より理解される如く、Ｃｅｑが０．３０７の同一
母材を成分が異なる溶接ワイヤ（Ｃｅｑ＝０．３０７〜
０．５５３）にて溶接した実施例１〜１６では、同一母
材条件の従来例１の吸収エネルギー値０．７と比較して
それを２．０〜４．６と向上できた。Ｃｅｑが０．３０
３〜０．３４６と異なる母材を、Ｔｉ添加の同一成分の
溶接ワイヤ（Ｃｅｑ＝０．４３１）にて溶接した実施例
１７．１８．１９．２１では、夫々と同一母材の従来例
２，３，４．６の吸収エネルギー値０．６〜１．２と比
較してそれを３．０〜３．７に向上でき、また高強度用
の母材であるＣｅｑが０．５２４と高い実施例２０では
、それと同一母材の従来例５の吸収エネルギー値０．２
と比較してそれを１．３に向上できた。また実施例１〜
２１の場合にはフェライトハンド部での硬度とそれ以外
の溶接部でのそれとの差を、従来例１〜６の場合よりも
小さくでき、本発明による場合は母材よりも本来軟質の
フェライトハンド部を母材と同等にすることが可能とな
った。比較例１．２は実施例１〜１６゜従来例１と同一
母材（Ｃｅｑ＝０．３０７）をそれと略同−組成のワイ
ヤを使用して本発明により溶接した場合であり、吸収エ
ネルギー値が夫々０．６，０．８となっており、従来例
１の吸収エネルギー値０．７と比較しても余り変わらず
、またフェライトバンド部の硬度についても改善できて
いない。つまり、靭性を所定レベルにまで改善するため
には使用する溶接ワイヤの成分を選定した上で本発明を
実施する必要がある。As can be understood from this table, welding wires with different compositions (Ceq = 0.307~
In Examples 1 to 16, which were welded at 0.553), the absorbed energy value was improved to 2.0 to 4.6 compared to 0.7 in Conventional Example 1 under the same base material conditions. Ceq is 0.30
In Example 17, 18, 19, and 21, base materials different from 3 to 0.346 were welded using welding wire of the same composition with addition of Ti (Ceq = 0.431), and conventional example 2 with the same base material respectively. , 3, and 4.6, the absorbed energy value can be improved to 3.0 to 3.7, and the Ceq, which is the base material for high strength, is as high as 0.524. In Example 20, the absorbed energy value of Conventional Example 5 of the same base material is 0.2.
We were able to improve it to 1.3 compared to . Also, Example 1~
In the case of No. 21, the difference between the hardness of the ferrite hand part and that of the other weld parts can be made smaller than in the cases of conventional examples 1 to 6. It is now possible to make the part the same as the base material. Comparative Example 1.2 is a case in which the same base material (Ceq = 0.307) as in Examples 1 to 16゜Conventional Example 1 was welded according to the present invention using a wire having approximately the same composition as that of Conventional Example 1, and the absorbed energy value was are 0.6 and 0.8, respectively, which is not much different from the absorbed energy value of 0.7 in Conventional Example 1, and the hardness of the ferrite band portion has not been improved. That is, in order to improve the toughness to a predetermined level, it is necessary to implement the present invention after selecting the components of the welding wire to be used.
なお、上記説明では誘導加熱コイル４にて溶接前にオー
ブンバイブＯＰを加熱しているが、本発明はこれに限ら
ずコンタクトチップをオーブンバイブＯＰに接触させて
加熱する方式によっても同様に実施できる。In addition, in the above explanation, the oven vibe OP is heated by the induction heating coil 4 before welding, but the present invention is not limited to this, and can be similarly implemented by a method of heating the contact tip by bringing it into contact with the oven vibe OP. .
以上詳述した如く本発明はオーブンバイブの溶接すべき
箇所を所定の消耗電極式ガスシールドア−り溶接法にて
溶接するので、Ｃ，Ｓｉ＋ Ｍｎ、 Ｃｒ。As described in detail above, in the present invention, the parts of the oven vibe to be welded are welded by a predetermined consumable electrode type gas shield arc welding method, so that C, Si + Mn, Cr.
Ｎｉ＋ Ｍｏ、 Ｖ、 Ｔｉ、 Ｎｂ、 Ｂ、 Ｃ
ｕ等のうち少なくとも１種以上を母材よりも多く含有す
る溶接ワイヤを使用することにより、軟質のフェライト
バンド部分を母材と同等の硬度とすることが可能である
。Ni+ Mo, V, Ti, Nb, B, C
By using a welding wire containing more of at least one kind of u, etc. than the base metal, it is possible to make the soft ferrite band portion have the same hardness as the base metal.
このため本発明により製造した電縫鋼管は高級ラインパ
イプ、ケーシング用として安定して通用できる等、本発
明は優れた効果を奏する。Therefore, the present invention has excellent effects, such as the electric resistance welded steel pipe manufactured according to the present invention being stably usable as high-grade line pipes and casings.
第１図は本発明方法を用いる電縫鋼管製造ラインを示す
模式的平面図、第２図は本発明の実施状態を模式的に示
す縦断面図である。FIG. 1 is a schematic plan view showing an electric resistance welded steel pipe manufacturing line using the method of the present invention, and FIG. 2 is a longitudinal sectional view schematically showing the state of implementation of the present invention.
Claims (1)
オープンパイプとし、該オープンパイプの対向側端部に
高周波電流を通じて加熱、溶融し、然る後両側方より加
圧して電縫鋼管を製造する方法において、 前記対向側端部が収束する位置に対応させ て、消耗電極を使用するガスシールドアーク溶接装置を
設け、 対向側端部の収束位置近傍に、前記消耗電 極の先端を溶融してなる溶滴を添加することを特徴とす
る電縫鋼管の製造方法。[Scope of Claims] 1. The side end surfaces of the steel strip are bent to form an open pipe, and the opposite end portions of the open pipe are heated and melted by passing a high frequency current, and then both sides are heated and melted. In the method of manufacturing an ERW steel pipe by applying more pressure, a gas-shielded arc welding device using a consumable electrode is provided corresponding to the position where the opposite ends converge, and near the convergence position of the opposite ends, A method for manufacturing an electric resistance welded steel pipe, comprising adding droplets formed by melting the tip of the consumable electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14341585A JPS623879A (en) | 1985-06-28 | 1985-06-28 | Production for seam welded steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14341585A JPS623879A (en) | 1985-06-28 | 1985-06-28 | Production for seam welded steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS623879A true JPS623879A (en) | 1987-01-09 |
Family
ID=15338232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14341585A Pending JPS623879A (en) | 1985-06-28 | 1985-06-28 | Production for seam welded steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS623879A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0523869A (en) * | 1991-07-23 | 1993-02-02 | Sumitomo Metal Ind Ltd | Manufacture of weld tube |
| FR2685234A1 (en) * | 1991-12-19 | 1993-06-25 | Mtu Maintenance Gmbh | METHOD AND DEVICE FOR WELDING SPECIAL ALLOY PARTS BY ARC WELDING WITH PROTECTIVE GAS WITH PREHEATING. |
| JPH05200544A (en) * | 1992-01-29 | 1993-08-10 | Sumitomo Metal Ind Ltd | Manufacture of welded pipe |
| JP2007224512A (en) * | 2006-02-21 | 2007-09-06 | Toto Ltd | Sanitary washing toilet seat device and toilet equipment |
| JP2007270490A (en) * | 2006-03-31 | 2007-10-18 | Toto Ltd | Sanitary washing toilet seat device and toilet apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56168981A (en) * | 1980-05-28 | 1981-12-25 | Sumitomo Metal Ind Ltd | Production of electric welded tube |
-
1985
- 1985-06-28 JP JP14341585A patent/JPS623879A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56168981A (en) * | 1980-05-28 | 1981-12-25 | Sumitomo Metal Ind Ltd | Production of electric welded tube |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0523869A (en) * | 1991-07-23 | 1993-02-02 | Sumitomo Metal Ind Ltd | Manufacture of weld tube |
| FR2685234A1 (en) * | 1991-12-19 | 1993-06-25 | Mtu Maintenance Gmbh | METHOD AND DEVICE FOR WELDING SPECIAL ALLOY PARTS BY ARC WELDING WITH PROTECTIVE GAS WITH PREHEATING. |
| JPH05200544A (en) * | 1992-01-29 | 1993-08-10 | Sumitomo Metal Ind Ltd | Manufacture of welded pipe |
| JP2007224512A (en) * | 2006-02-21 | 2007-09-06 | Toto Ltd | Sanitary washing toilet seat device and toilet equipment |
| JP2007270490A (en) * | 2006-03-31 | 2007-10-18 | Toto Ltd | Sanitary washing toilet seat device and toilet apparatus |
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