JPS60221173A - Production of clad pipe - Google Patents
Production of clad pipeInfo
- Publication number
- JPS60221173A JPS60221173A JP7598584A JP7598584A JPS60221173A JP S60221173 A JPS60221173 A JP S60221173A JP 7598584 A JP7598584 A JP 7598584A JP 7598584 A JP7598584 A JP 7598584A JP S60221173 A JPS60221173 A JP S60221173A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- clad
- steel
- alloy
- butt
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、汀通鋼を基材としこれにステンレス鋼等の合
金鋼を張り合わせたクラツド材を用いて管を製造する方
法に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method of manufacturing a pipe using a clad material made of a base material of steel and laminated with alloy steel such as stainless steel.
（発明の技術的背景とその問題点）
たとえば腐食環境で使用される管には耐食性が必要であ
るが、耐食性をもたせるために管を耐食社か右ナス春全
ｆ−） ＃ばステンレス合金のＡにより製造すると、第
１にコストがかかりすぎ、しかも強度に劣るという問題
がある。そこで、２種の金属板、たとえば普通鋼と耐食
性のある合金を張り合わせ、それぞれの特性を生かした
クラツド材を使用して管を製造することが行なわれる。(Technical background of the invention and its problems) For example, a pipe used in a corrosive environment must have corrosion resistance. When manufactured using A, firstly, there are problems in that it is too expensive and, moreover, it is inferior in strength. Therefore, pipes are manufactured by laminating two types of metal plates, such as ordinary steel and a corrosion-resistant alloy, and using a cladding material that takes advantage of the characteristics of each.
すなわち、腐食環境にされされる管表面に耐食性のある
合金を配するとともに、基材に普通鋼を使用することに
よりコストダウンを図りかつこの普通鋼基材により強度
を確保するものである。That is, by disposing a corrosion-resistant alloy on the surface of the tube exposed to a corrosive environment and using ordinary steel as the base material, costs are reduced and the strength is ensured by the ordinary steel base material.
ところで、一般にこのようなりラッド管の製造方法とし
ては継目無し法、溶接法等があり、このうち、本発明は
溶接法によるクラツド管の製造方法に係るものである。By the way, there are generally methods for manufacturing clad pipes such as a seamless method, a welding method, etc. Among these methods, the present invention relates to a method for manufacturing a clad pipe using a welding method.
溶接法によるクラツド管の製造方法では、従来、クラツ
ド鋼板またはクラツド鋼帯等のクラツド材を、プレス、
ロール曲げ、ロールフォーミング等により円筒状に曲成
した後、突合せ部をミグ溶接（ＭＩＧ）、ティグ溶接（
Ｔ Ｉ Ｇ）または被覆アーク溶接（ＳＡＷ）等の溶接
方法により溶接して造管していた。Conventionally, in the manufacturing method of clad pipes using the welding method, clad materials such as clad steel plates or clad steel strips are pressed,
After being bent into a cylindrical shape by roll bending, roll forming, etc., the butt part is MIG welded (MIG) or TIG welded (
The pipes were made by welding using welding methods such as TIG) or covered arc welding (SAW).
しかしながら、従来の溶接法では、普通鋼と合金銅の接
合境界近傍の溶接時に溶着金属の合金成分の希釈率のコ
ントロールが難しく、高温割れを生じ易い。このため、
通常の溶接手段に変更を加えたり、溶接入熱条件を変更
することにより合金成分の調節をするか、あるいは高合
金の溶接材料を使用することにより合金成分のバランス
を図って、希釈率が大きくなっても割れの生じない方法
が講しられる。また、特開昭５４−１３１５５７号公報
には、溶接時における母材のはみ出しを防止し、この部
分の耐食性を確保するため、防食性材料よりなる当て板
を溶接部に施して電縫溶接する方法が提案されており、
特開昭５７−１９２２４３号公報には、溶接性を損なわ
ないようにするため、溶接部分を溶接性のよい材料のみ
から形成する方法が提案されている。ところか、これら
の方法ではいずれにおいても、溶接手段、溶接材料、溶
接入熱等に制約が大きく、作業工数が非常に多くなるば
かりでなく、溶接材料のコストを増大させる等きわめて
問題が多い。However, in conventional welding methods, it is difficult to control the dilution rate of the alloy components of the weld metal when welding near the joining boundary between ordinary steel and alloyed copper, and hot cracking is likely to occur. For this reason,
The dilution ratio can be increased by adjusting the alloy composition by changing the usual welding method or by changing the welding heat input conditions, or by using high-alloy welding materials to balance the alloy composition. A method will be devised to prevent cracks from occurring even if Furthermore, Japanese Patent Application Laid-Open No. 54-131557 discloses that in order to prevent the base metal from protruding during welding and ensure the corrosion resistance of this part, a patch plate made of an anticorrosive material is applied to the welded part and electric resistance welding is performed. A method has been proposed,
Japanese Unexamined Patent Publication No. 57-192243 proposes a method in which the welded portion is formed only from materials with good weldability in order to avoid impairing weldability. However, in all of these methods, there are significant restrictions on welding means, welding materials, welding heat input, etc., and there are many problems such as not only an extremely large number of work steps but also an increase in the cost of welding materials.
（発明の目的）
そこで、本発明は上記問題点を解決するために成された
もので、本発明の目的は、作業性を大幅に改善するとと
もに、希釈率を最小に抑えることにより合金成分のアン
バランスによる高温割れを防ぐことができるクラツド管
の製造方法を提供することにある。(Objective of the Invention) Therefore, the present invention has been made to solve the above-mentioned problems.The purpose of the present invention is to significantly improve workability and reduce the alloy composition by minimizing the dilution rate. An object of the present invention is to provide a method for manufacturing a clad pipe that can prevent hot cracking due to unbalance.
（発明の構成）
この目的を達成するために、本発明は、クラツド鋼板ま
たは鋼帯を管状に曲成し、曲成鋼板または銅帯の対向両
縁部を加熱したあと側圧を加えて突合せ溶接し、突合せ
溶接ビード中の少なくとも合せ材部ビードを母材に到る
深さまで切削除去し、ジノ削除去部に合せ材と同様性質
を有する肉盛溶接を施すことを特徴とするものである。(Structure of the Invention) In order to achieve this object, the present invention bends a clad steel plate or steel strip into a tubular shape, heats both opposing edges of the bent steel plate or copper strip, and then butt-welds the curved steel plate or copper strip by applying side pressure. The method is characterized in that at least the bead of the cladding material in the butt weld bead is removed to a depth that reaches the base metal, and overlay welding having the same properties as the cladding material is performed on the removed portion.
すなわち、本発明は、クラツド鋼板または銅帯を管状に
曲成後、電縫溶接法により突合せ溶接を行なうと、合せ
材部（合金鋼部）は外方へ（外面クラフトの場合には外
面側へ、内面クラッドの場合には内面側へ）押し出され
るため、母材部（普通鋼部）は電縫溶接により完全に溶
接されることに着１」シて成されたもので、突合せによ
り外、内面に突出したビードは溶接直後切削され、この
切削部分すなわち合金鋼側に肉盛溶接が施される。That is, in the present invention, when a clad steel plate or a copper strip is bent into a tubular shape and then butt welded using the electric resistance welding method, the cladding material part (alloy steel part) moves outward (in the case of external craft, the outer surface side In the case of inner cladding, the base metal part (ordinary steel part) is completely welded by electric resistance welding. The bead protruding from the inner surface is cut immediately after welding, and overlay welding is performed on this cut portion, that is, on the alloy steel side.
この肉盛溶接においては、溶着金属は少なくてすみ、か
つ希釈率に影響する普通鋼の割合も少ないため、合金成
分のバランスコントロールも行ない易く、溶接材料につ
いてもこれを高合金にする必要はなく、低入熱でかつ合
金鋼溶接材料の使用量も少なくてよい。また、一層盛の
溶接でよいため作業性もよいものである。In this overlay welding, the amount of deposited metal is small, and the proportion of ordinary steel that affects the dilution rate is also small, so it is easy to control the balance of alloy components, and there is no need to use high-alloy welding materials. , the heat input is low, and the amount of alloy steel welding material used can be small. In addition, workability is also good because only one layer of welding is required.
（発明の具体例） つぎに、本発明の具体例について説明する。(Specific example of invention) Next, specific examples of the present invention will be explained.
本発明によれば、第１図に示すように、普通鋼１１と合
金鋼１２とから成るクラツド鋼板またはクラツド鋼帯等
のクラツド材ｌは電縫溶接法によりクラツド管に製造さ
れる。According to the present invention, as shown in FIG. 1, a clad material 1 such as a clad steel plate or a clad steel strip made of ordinary steel 11 and alloy steel 12 is manufactured into a clad pipe by electric resistance welding.
クラツド材は、たとえば数段のフォーミングロールによ
り順次円筒形に成形されエツジ部に加熱を受けた（第１
図（ａ））後、突き合せ溶接される（第１１剣（ｂ））
、後に詳述するように、突合せ溶接によりクラツド材１
の内外面に突出したビード１１’、１２’のうち少なく
とも合せ材１２側のビードは母材に達する深さまで切除
され、９ノ除部分に合せ材１２相当の溶接材料１３が肉
盛溶接される。The cladding material is formed into a cylindrical shape sequentially using, for example, several stages of forming rolls, and the edges are heated (first
Figure (a)) is then butt welded (11th sword (b))
, as detailed later, the clad material 1 is assembled by butt welding.
Of the beads 11' and 12' protruding from the inner and outer surfaces of the welding material 12, at least the bead on the laminate material 12 side is cut to a depth that reaches the base metal, and a welding material 13 equivalent to the laminate material 12 is overlay welded on the 9th removed portion. .
さらに詳細に説明すると、上記のフォーミングロールに
よる成形において、クラツド鋼板またはクラツド鋼帯等
のクラツド材は、合金鋼と普通鋼とで完全に金属的に結
合されており、かつ圧延材であるため十分な延性および
靭性を有しており、成形加工による界面の剥離は発生し
ない、また、成形中等に発生する表面疵についても、表
面処理鋼板のように被覆層厚が１００＃Ｌｍ程度の薄い
ものについては疵により被覆層がとれ、後に手直しが必
要となる場合があるが、クラツド鋼板は合金鋼の厚さを
変更することが容易であり、一般に３００ｐｍ以上の厚
さのある場合には、表面疵により合金層がとれてしまう
ことはない。To explain in more detail, in forming with the above-mentioned forming rolls, the clad material such as the clad steel plate or the clad steel strip is completely metallically bonded to alloy steel and ordinary steel, and is a rolled material. It has excellent ductility and toughness, and does not cause peeling at the interface during forming.Also, it is resistant to surface flaws that occur during forming, etc., even when the coating layer is as thin as 100 #Lm, such as surface-treated steel sheets. However, with clad steel sheets, the thickness of the alloy steel can be easily changed, and in general, if the thickness is 300 pm or more, the coating layer may come off due to scratches and repair may be required later. The alloy layer will not come off.
電縫溶接には、電気抵抗溶接法と電気誘導溶接法がある
。電気誘導法は、コイルによる誘導加熱によるエツジ部
を加熱させるためノ々イブに非接触であり、鋼板表面に
疵をつけないが、電力ロスが大きいため一般に外径２０
０ｍｍ以下の鋼管製造に適用され、これより大径のもの
については電気抵抗溶接法が適用される。後者の方法で
は、コンタクトチップを直接パイプに接触させ、高周波
電流を直接供給してエツジ部を加熱するが、コンタクト
チップ接触部に疵が発生し、融点の低い金属がパイプ外
面にある場合には溶けてしまうこともある。このような
疵に対しても合金鋼部を厚く設計することにより後の手
直しを不要とすることができる。Electric resistance welding includes electric resistance welding and electric induction welding. The electric induction method heats the edges by induction heating using a coil, so there is no contact with the steel plate, and it does not cause scratches on the surface of the steel plate, but because of the large power loss, it is generally
It is applied to the manufacture of steel pipes with a diameter of 0 mm or less, and electric resistance welding is applied to pipes with a larger diameter. In the latter method, the contact tip is brought into direct contact with the pipe and a high-frequency current is directly supplied to heat the edge. It may even melt. By designing the alloy steel part to be thick, it is possible to eliminate the need for subsequent rework even in the case of such flaws.
加熱後の突合せ溶接においては、クラ・ンド材１の界面
は完全に接合しているため、突合せ形状は第２図に示す
とおりとなる。すなわち、第２図（ａ）は外面クラッド
の場合の突合せ溶接時の突合せ部分の状７ｇを示す説明
図であり、合金鋼部１２は外法に押し出され（１２’）
、を通用部１１は完全に溶接される。第２図（ｂ）は内
面クラッドの場合の同様の説明図である。図に示すよう
に、合金成分が電縫溶接面に入り、溶接欠陥の原因とな
ることもなく、かつ突合せ時のアプセットを行なっても
近傍の界面剥離は見られない。In the butt welding after heating, the interface between the clamp and the bond material 1 is completely joined, so the butt shape is as shown in FIG. 2. That is, FIG. 2(a) is an explanatory view showing the shape 7g of the butt part during butt welding in the case of external cladding, in which the alloy steel part 12 is extruded outward (12').
, the communication part 11 is completely welded. FIG. 2(b) is a similar explanatory diagram in the case of an inner cladding. As shown in the figure, the alloy components enter the electric resistance welding surface and do not cause welding defects, and no nearby interface peeling is observed even after upsetting at the time of butting.
突合せ溶接時に内外面に突出したビード１１’および１
２°は、突合せ溶接直後に切削される。Beads 11' and 1 protruding from the inner and outer surfaces during butt welding
2° is cut immediately after butt welding.
この切削は、第３図〜第５図に示すような方法で行なわ
れる。第３図〜第５図において、（ａ）は外面クラット
の場合を、（ｂ）は内面クラッドの場合を示す。これら
の方法において、ビードのうち少なくとも合せ材（合金
鋼）側のビード１１”、１２゛が母材（普通鋼）に達す
る深さまで９ノ削除去される。この切削除去においても
、クラッド界面の接合は十分であり、普通鋼のビード切
削と同じ方法で切削することができる。ビード切削除去
後の肉盛溶接を考慮すると、ビード切削は管の曲率に沿
った切削（第３図）よりも、小さ・い曲率での切削（第
４図）あるいはＶ字形切削（第５図）の方がより好まし
い、この場合には、溶接装置のセンター倣いを容易とす
ることができる。これは、内面クラッドの場合に特に好
ましい。上記のようにしてビードが除去された管では、
ビード除去部に汗通鋼が露出することとなり、合せ材相
当の溶接材が肉盛溶接される。溶接材としては、合せ材
１２の共金ワイヤのほか合せ材と同様の性質を有するも
のを使用することができる。肉盛溶接法としては、ＭＩ
Ｇ法、ＴＩＧ法、ＳＡＷ法等によることかできる。この
肉盛溶接では、従来法と比べて普通鋼の部分が非常に少
ないため肉盛する溶着金属量はきわめて少なくて済み、
かつ箱状率に影響する普通鋼の割合も少ないため、合金
鋼の成分に等しい溶着金属をつくる溶接材料の成分コン
トロールか行ない易く、一層盛で十分目的を達成するこ
とができる。This cutting is performed by the method shown in FIGS. 3 to 5. In FIGS. 3 to 5, (a) shows the case of an outer cladding, and (b) shows the case of an inner cladding. In these methods, at least nine of the beads 11'' and 12'' on the cladding material (alloy steel) side are removed to a depth that reaches the base material (common steel). The joint is sufficient and can be cut using the same method as bead cutting for ordinary steel.If we consider overlay welding after removing the bead, bead cutting is easier than cutting along the curvature of the pipe (Fig. 3). , cutting with a small curvature (Fig. 4) or V-shaped cutting (Fig. 5) is more preferable. In this case, it is easier to follow the center of the welding device. Particularly preferred in the case of cladding.In tubes from which beads have been removed as described above,
The perforated steel is exposed at the bead removed portion, and a welding material equivalent to the cladding material is overlay welded. As the welding material, in addition to the matching wire of the joining material 12, materials having the same properties as the joining material can be used. The overlay welding method is MI
This can be done by the G method, TIG method, SAW method, etc. With this overlay welding, the amount of weld metal to be overlaid is extremely small because the portion of ordinary steel is very small compared to the conventional method.
In addition, since the proportion of ordinary steel that affects the box-like ratio is small, it is easy to control the composition of the welding material to produce a deposited metal having the same composition as that of alloy steel, and the purpose can be sufficiently achieved with even more welding.
（９５：明の効果）
上記したように、本発明によれば、電ｌ溶接法を採用す
ることにより、まず高能率にかつ確実にハ通鋼側を溶接
し、この突合せ溶接により突出したビードのうち合金側
のビードを切削除去し、除去部に合金相当溶接材を肉盛
溶接することにより、溶接作業性を大幅に改善するとと
もに、溶着金属量を抑え、合金成分コントロールを容易
とし、また一層盛をｒｒ（能とすることができる。(95: Effect of light) As described above, according to the present invention, by employing the electric welding method, first, the through steel side is welded highly efficiently and reliably, and the protruding bead is welded by this butt welding. By removing the bead on the alloy side and overlaying the removed part with a welding material equivalent to the alloy, welding workability is greatly improved, the amount of welded metal is suppressed, and the alloy composition can be easily controlled. It can be made into rr (Noh).
第１図は本発明によるクラツド管製造方法の溶接方法を
示す工程図、第２図は本発明による溶接時の突合せ形状
を示す図、第３図〜第５図は本発明によるビード切除方
法の例を示す図である。
ｌ・・クラツド材 １１・・母材（普通鋼）１２・・合
せ材（合金鋼）
１３・・溶接材料
１１ ’ 、１２°・Φビード
４ＩＦ許出願人 住友金属工業株式会社代理人弁理士
永 井 義 久FIG. 1 is a process diagram showing the welding method of the clad pipe manufacturing method according to the present invention, FIG. 2 is a diagram showing the butt shape during welding according to the present invention, and FIGS. 3 to 5 are diagrams showing the bead cutting method according to the present invention. It is a figure which shows an example. l... Clad material 11... Base material (common steel) 12... Laminated material (alloy steel) 13... Welding material 11', 12° Φ bead 4IF Applicant Patent attorney representing Sumitomo Metal Industries Co., Ltd.
Yoshihisa Nagai
Claims (1)
板または鋼帯の対向両縁部を加熱したあと側圧を加えて
突合せ溶接し、突合せ溶接ビード中の少なくとも合せ材
側ビードを母材に到る深さまでνＪ削除去し、レノ削除
去部に合せ材と同様性質を有する肉盛溶接を施すことを
特徴とするクラツド管の製造方法。(1) A clad steel plate or copper strip is bent into a tubular shape, and after heating both opposite edges of the bent steel plate or steel strip, side pressure is applied and butt welded, and at least the bead on the cladding material side of the butt weld bead is A method for manufacturing a clad pipe, characterized in that νJ is removed to a depth that reaches the thickness of the material, and overlay welding having properties similar to those of the laminated material is applied to the removed portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7598584A JPS60221173A (en) | 1984-04-16 | 1984-04-16 | Production of clad pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7598584A JPS60221173A (en) | 1984-04-16 | 1984-04-16 | Production of clad pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60221173A true JPS60221173A (en) | 1985-11-05 |
| JPH0224197B2 JPH0224197B2 (en) | 1990-05-28 |
Family
ID=13592062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7598584A Granted JPS60221173A (en) | 1984-04-16 | 1984-04-16 | Production of clad pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60221173A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01224179A (en) * | 1988-03-04 | 1989-09-07 | Nkk Corp | Manufacture of clad welded steel pipe |
| JPH01224178A (en) * | 1988-03-04 | 1989-09-07 | Nkk Corp | Manufacture of clad welded steel pipe |
| CN103551751A (en) * | 2013-10-23 | 2014-02-05 | 长春轨道客车股份有限公司 | Process for synthesizing assembly welding of CRH5 vehicle side wall sectional material |
| CN103978299A (en) * | 2014-05-30 | 2014-08-13 | 北京隆盛泰科石油管科技有限公司 | Process for production of double-metal metallurgical composite tube through high frequency resistance welding method and composite tube |
| JP2017154177A (en) * | 2016-03-01 | 2017-09-07 | Ｊｆｅスチール株式会社 | Manufacturing method of electro-resistance-welded clad steel tube |
| KR20170109059A (en) | 2015-03-12 | 2017-09-27 | 제이에프이 스틸 가부시키가이샤 | Electric resistance welded stainless clad steel pipe and method of manufacturing same |
| WO2018047723A1 (en) | 2016-09-12 | 2018-03-15 | Ｊｆｅスチール株式会社 | Clad welded pipe and method of manufacturing same |
| KR20190021444A (en) | 2016-06-30 | 2019-03-05 | 제이에프이 스틸 가부시키가이샤 | Welded stainless steel clad pipe and its manufacturing method |
| KR20190051033A (en) | 2016-09-12 | 2019-05-14 | 제이에프이 스틸 가부시키가이샤 | Welded clad steel pipe and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212915B (en) * | 2013-03-28 | 2016-05-04 | 宁波马斯特船舶设计有限公司 | Boats and ships mending of iron castings method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52155151A (en) * | 1976-06-18 | 1977-12-23 | Mitsubishi Heavy Ind Ltd | Welding process for clad stainless steel |
| JPS58112678A (en) * | 1981-12-25 | 1983-07-05 | Sumitomo Metal Ind Ltd | Clad metallic pipe |
| JPS58154488A (en) * | 1982-03-08 | 1983-09-13 | Kobe Steel Ltd | Production of clad steel pipe |
-
1984
- 1984-04-16 JP JP7598584A patent/JPS60221173A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52155151A (en) * | 1976-06-18 | 1977-12-23 | Mitsubishi Heavy Ind Ltd | Welding process for clad stainless steel |
| JPS58112678A (en) * | 1981-12-25 | 1983-07-05 | Sumitomo Metal Ind Ltd | Clad metallic pipe |
| JPS58154488A (en) * | 1982-03-08 | 1983-09-13 | Kobe Steel Ltd | Production of clad steel pipe |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01224178A (en) * | 1988-03-04 | 1989-09-07 | Nkk Corp | Manufacture of clad welded steel pipe |
| JPH01224179A (en) * | 1988-03-04 | 1989-09-07 | Nkk Corp | Manufacture of clad welded steel pipe |
| CN103551751A (en) * | 2013-10-23 | 2014-02-05 | 长春轨道客车股份有限公司 | Process for synthesizing assembly welding of CRH5 vehicle side wall sectional material |
| CN103978299A (en) * | 2014-05-30 | 2014-08-13 | 北京隆盛泰科石油管科技有限公司 | Process for production of double-metal metallurgical composite tube through high frequency resistance welding method and composite tube |
| KR20170109059A (en) | 2015-03-12 | 2017-09-27 | 제이에프이 스틸 가부시키가이샤 | Electric resistance welded stainless clad steel pipe and method of manufacturing same |
| JP2017154177A (en) * | 2016-03-01 | 2017-09-07 | Ｊｆｅスチール株式会社 | Manufacturing method of electro-resistance-welded clad steel tube |
| US10724670B2 (en) | 2016-06-30 | 2020-07-28 | Jfe Steel Corporation | Method of producing electric-resistance-welded stainless clad steel pipe or tube |
| KR20190021444A (en) | 2016-06-30 | 2019-03-05 | 제이에프이 스틸 가부시키가이샤 | Welded stainless steel clad pipe and its manufacturing method |
| US10844993B2 (en) | 2016-06-30 | 2020-11-24 | Jfe Steel Corporation | Electric-resistance-welded stainless clad steel pipe or tube |
| WO2018047723A1 (en) | 2016-09-12 | 2018-03-15 | Ｊｆｅスチール株式会社 | Clad welded pipe and method of manufacturing same |
| EP3511081A4 (en) * | 2016-09-12 | 2019-10-02 | JFE Steel Corporation | Electric-resistance-welded clad steel pipe and method for manufacturing same |
| KR20190053891A (en) | 2016-09-12 | 2019-05-20 | 제이에프이 스틸 가부시키가이샤 | Clad weld tube and its manufacturing method |
| KR20190051033A (en) | 2016-09-12 | 2019-05-14 | 제이에프이 스틸 가부시키가이샤 | Welded clad steel pipe and its manufacturing method |
| US11079045B2 (en) | 2016-09-12 | 2021-08-03 | Jfe Steel Corporation | Electric resistance welded clad steel pipe or tube and method of producing same |
| US11484927B2 (en) | 2016-09-12 | 2022-11-01 | Jfe Steel Corporation | Clad welded pipe or tube and method of producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0224197B2 (en) | 1990-05-28 |
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