JPH04313468A - Welding method for stainless clad steel pipe - Google Patents
Welding method for stainless clad steel pipeInfo
- Publication number
- JPH04313468A JPH04313468A JP7125591A JP7125591A JPH04313468A JP H04313468 A JPH04313468 A JP H04313468A JP 7125591 A JP7125591 A JP 7125591A JP 7125591 A JP7125591 A JP 7125591A JP H04313468 A JPH04313468 A JP H04313468A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- steel
- stainless steel
- groove
- stainless
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 95
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 48
- 239000010935 stainless steel Substances 0.000 claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 34
- 230000007547 defect Effects 0.000 abstract description 9
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000010790 dilution Methods 0.000 description 14
- 239000012895 dilution Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 12
- 239000002184 metal Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 239000002356 single layer Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000011324 bead Substances 0.000 description 4
- 238000005253 cladding Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000012733 comparative method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は内側にＮｉ，Ｃｒなどを
基調とするステンレス鋼、母材として炭素鋼あるいは低
合金鋼（以下低合金鋼という）を使用するステンレスク
ラッド鋼を、ＵＯＥなどの方法によって鋼管を製造する
場合のシーム溶接法に関するものである。[Industrial Application Field] The present invention uses stainless steel such as UOE, which uses stainless steel based on Ni, Cr, etc. on the inside and carbon steel or low alloy steel (hereinafter referred to as low alloy steel) as the base material. This invention relates to a seam welding method for producing steel pipes by this method.
【０００２】0002
【従来の技術】近年、石油資源などの開発環境がより厳
しくなりつつあり、敷設されるラインパイプにも優れた
耐食性が要求され、特に腐食性の強いラインパイプ材に
は、従来から使用されている低合金鋼ではその寿命が極
端に短くなり、ステンレス鋼もしくはステンレス鋼以上
に貴な成分を有する高合金鋼が用いられる傾向がある。
しかしながら、ステンレス鋼や高合金鋼のみでラインパ
イプを敷設するとその費用は莫大なものとなるため、耐
食性が要求される鋼管の内側のみステンレス鋼や高合金
鋼とし、外側に低合金鋼を使用したクラッド鋼管が注目
されてきている。この種クラッド鋼管は、ステンレス鋼
や高合金鋼と低合金鋼を圧延によってクラッドしたあと
、通常ＵＯＥ法によって管体に成形し、管体長手方向の
シーム部を突き合わせ溶接して製造される。[Prior Art] In recent years, the development environment for petroleum resources and other resources has become more severe, and line pipes that are laid are required to have excellent corrosion resistance. The lifespan of low-alloy steels is extremely short, and there is a tendency to use stainless steels or high-alloy steels with more noble components than stainless steels. However, laying line pipes using only stainless steel or high-alloy steel would be extremely expensive, so it was decided to use stainless steel or high-alloy steel only on the inside of the pipe, where corrosion resistance is required, and use low-alloy steel on the outside. Clad steel pipes are attracting attention. This type of clad steel pipe is manufactured by cladding stainless steel, high-alloy steel, and low-alloy steel by rolling, then forming the tube into a tube using the UOE method, and butt-welding the longitudinal seams of the tube.
【０００３】しかしながら、このシーム部の突き合わせ
溶接部、特に鋼管の内側の溶接部に欠陥が発生するとい
う問題がある。それは内側にクラッドされたステンレス
鋼もしくは高合金鋼部分が溶接によって溶融するととも
に低合金鋼部分も溶融され、希釈混合によって溶接部の
成分がクラッドされたステンレス鋼もしくは高合金鋼よ
りも卑な成分となるため、溶接部の耐食性などその特性
が維持できなくなるからである。However, there is a problem in that defects occur in the butt weld of the seam, particularly in the weld on the inside of the steel pipe. The inner clad stainless steel or high-alloy steel part is melted by welding, and the low-alloy steel part is also melted, and by dilution mixing, the composition of the weld becomes less base than the clad stainless steel or high-alloy steel. This is because the properties such as corrosion resistance of the welded part cannot be maintained.
【０００４】そのような溶接部の欠陥を防止するため特
公平１−３８５９７号公報では、特にステンレスクラッ
ド鋼管の溶接において、突き合わせ部をＸ開先とし、内
側を二段開先とすることによって、ビード幅を広げて潜
孤溶接時のスラグ浮上を容易とすると共に、内側ステン
レス鋼部分に帯状電極を用いてバンドアーク溶接を行っ
て希釈率を低下させることを開示している。しかし、帯
状電極を用いたアーク溶接では、帯幅にわたってアーク
が均一にならず健全な溶接部が得られないことがある。In order to prevent such defects in welded parts, Japanese Patent Publication No. 1-38597 discloses that, especially in welding stainless clad steel pipes, the butt part has an It is disclosed that the dilution rate is reduced by widening the slag to facilitate slag floating during latent arc welding, and by performing band arc welding using a band-shaped electrode on the inner stainless steel part. However, in arc welding using a strip electrode, the arc may not be uniform across the width of the strip, making it impossible to obtain a sound weld.
【０００５】一方、特開昭６３−１００９５号公報には
、Ｘ開先の深さ、角度を指定し、内側低合金部分をＭＩ
Ｇ溶接、高合金削除部を潜孤溶接で１ラン溶接を可能に
することが開示されている。すなわち該公報には、高合
金突き合わせ部に低合金鋼の内側開先と干渉しない幅を
削除することで潜孤溶接時の希釈率を低く抑えられるこ
とを開示している。On the other hand, in JP-A-63-10095, the depth and angle of the X groove are specified, and the inner low alloy part is MI
It is disclosed that it is possible to perform one-run welding by G welding and latent arc welding of a high alloy deleted part. That is, this publication discloses that the dilution rate during latent arc welding can be kept low by eliminating a width in the high alloy butt portion that does not interfere with the inner groove of the low alloy steel.
【０００６】しかし、いずれも二種類の溶接方法が必要
であり、特に前者では低合金鋼部分の潜孤溶接を終了し
たあと、更に帯状電極でステンレス鋼部分の潜孤溶接を
行なう必要があり、一旦低合金鋼部分のビード表面のス
ラグを除去しなければならず、全体の溶接時間が長くな
り生産性が低くなること、また、両者とも低合金鋼部分
の溶接用には低合金鋼用の溶接材料の適用を前提として
おり、その溶接時にステンレス鋼部分を溶融させないこ
とが必須条件と成っている。しかし実際のＵＯ工程にお
けるシーム溶接部の開先断面は必ずしも一定とは限らな
いため、ステンレス鋼部分の溶融希釈による該溶接金属
部の割れ発生に対する問題が残っている。However, in both cases, two types of welding methods are required, and in particular, in the former method, after the latent arc welding of the low alloy steel part is completed, it is necessary to further perform latent arc welding of the stainless steel part with a strip electrode. The slag on the bead surface of the low-alloy steel part must be removed once, which increases the overall welding time and reduces productivity. It is assumed that welding materials will be used, and it is an essential condition that the stainless steel parts will not be melted during welding. However, since the groove cross section of the seam weld in the actual UO process is not necessarily constant, there remains the problem of cracking in the weld metal due to melt dilution of the stainless steel part.
【０００７】[0007]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解消すべくなされたものであって、ステンレ
ス鋼と低合金鋼とのクラッド鋼を鋼管に製造するに際し
、特にＵＯＥ法で成形した管体長手方向のシーム部突き
合わせ溶接をするにあたって、内側の開先形状とその溶
接条件を抑制して溶接欠陥のない、且つ簡便なステンレ
スクラッド鋼管の製造方法を提供することを目的とする
。[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned conventional problems, and it is particularly important to use the UOE method when producing steel pipes from clad steel made of stainless steel and low alloy steel. The purpose of the present invention is to provide a simple method for manufacturing stainless clad steel pipes without welding defects by controlling the shape of the inner groove and the welding conditions when butt welding the seams in the longitudinal direction of formed pipe bodies. .
【０００８】[0008]
【課題を解決するための手段】本発明は上記の目的を達
成するために、以下の構成を要旨とする。
（１） 低合金鋼とステンレス鋼からなるクラッド鋼
板を内側がステンレス鋼となる如く管状に成形し、その
突き合わせ部にＸ型の開先加工をほどこして該Ｘ型開先
部をシーム溶接してクラッド鋼管を製造するにあたり、
内側の開先深さがステンレス鋼厚みの８０〜１００％と
し、角度２０〜１２０°となる開先を設け、外側開先部
を仮付溶接した後、内側ステンレス鋼開先部を溶接電流
が４００〜８００Ａの範囲で、内側および外側ともステ
ンレス鋼以上の成分を有する溶接ワイヤーを用い、それ
ぞれ１層の潜孤溶接することを特徴とするステンレスク
ラッド鋼管の溶接方法。
（２） 内側ステンレス鋼の厚さが２〜４ｍｍである
ことを特徴とする上記１項記載のステンレスクラッド鋼
管の溶接方法。[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. (1) A clad steel plate made of low alloy steel and stainless steel is formed into a tubular shape so that the inside is made of stainless steel, an X-shaped groove is formed at the butt part, and the X-shaped groove is seam welded. In manufacturing clad steel pipes,
A groove with an inner groove depth of 80 to 100% of the stainless steel thickness and an angle of 20 to 120 degrees is prepared, and after tack welding the outer groove, the inner stainless steel groove is welded with a welding current. A method for welding stainless clad steel pipes, characterized in that one layer of latent arc welding is performed on each of the inner and outer sides using a welding wire having a composition higher than that of stainless steel in the range of 400 to 800A. (2) The method for welding a stainless clad steel pipe according to item 1 above, wherein the inner stainless steel has a thickness of 2 to 4 mm.
【０００９】さらに本発明においては、内側ステンレス
鋼部の潜孤溶接するにあたって次の条件を採用すること
が望ましい。すなわち、◎■溶接ワイヤーは溶接アーク
の安定性から２．４〜４．８ｍｍの範囲が好ましい。■
溶接電極数は内側用として１〜２電極、外側用として２
〜３電極の範囲とすることが好ましい。■溶接の順序は
、内側の潜孤溶接後に外側の潜孤溶接を行なうことが、
ＵＯ工程を有効活用する点から好ましいが、逆の溶接順
序であっても特に問題ない。■潜孤溶接用のフラックス
はメルト及びボンドタイプのいずれでもよい。Furthermore, in the present invention, it is desirable to adopt the following conditions when performing latent arc welding of the inner stainless steel part. That is, ◎■ The welding wire preferably has a thickness in the range of 2.4 to 4.8 mm in view of the stability of the welding arc. ■
The number of welding electrodes is 1 to 2 for inside and 2 for outside.
It is preferable to set it as the range of 3 electrodes. ■The order of welding is to perform latent arc welding on the outside after welding on the inside.
Although it is preferable from the point of view of effectively utilizing the UO process, there is no particular problem even if the welding order is reversed. ■Flux for latent arc welding may be either melt or bond type.
【００１０】以下本発明を詳細に説明する。本発明の対
象とするステンレスクラッド鋼は、低合金鋼などを母材
とし、その表面にステンレス、例えばＳＵＳ３０４やＳ
ＵＳ３１６などを合わせ材として接着させたもので、こ
のクラッド鋼自体は従来の方法によって製造されるもの
である。ステンレスクラッド鋼（板）はＵＯ工程で管状
に成形され、シーム溶接部となる両端部に開先が設けら
れている。開先形状は一般的な突き合わせ用の各種形状
を使用できるが、ＵＯ工程ではＸ型の開先形状が通常用
いられる。The present invention will be explained in detail below. The stainless clad steel that is the object of the present invention has a base material such as low alloy steel, and the surface thereof is made of stainless steel, such as SUS304 or SUS304.
This clad steel is made by bonding US316 or the like as a laminating material, and the clad steel itself is manufactured by a conventional method. Stainless clad steel (plate) is formed into a tubular shape by the UO process, and grooves are provided at both ends that will become seam welds. Although various shapes for general butting can be used as the groove shape, an X-shaped groove shape is usually used in the UO process.
【００１１】図１に本発明の開先形状の一例を示す。外
側低合金鋼１と内側ステンレス鋼２からなるクラッド鋼
は、シーム突き合わせ部３で外側低合金鋼１に対し、該
鋼厚さｔに対し深さｈ１ が０．６〜０．８ｔの範囲で
かつθ１ ＝６０〜８０°の角度になるように開先５を
設ける。一方、内側のステンレス鋼にも該ステンレス鋼
厚さｔに対して深さｈ２ が０．８〜１．０ｔの範囲で
角度２０〜１２０°の開先５を形成する。FIG. 1 shows an example of the groove shape of the present invention. The clad steel consisting of the outer low-alloy steel 1 and the inner stainless steel 2 has a depth h1 in the range of 0.6 to 0.8 t relative to the steel thickness t at the seam abutting portion 3 relative to the outer low-alloy steel 1. The groove 5 is provided at an angle of θ1 =60 to 80°. On the other hand, a groove 5 having an angle of 20 to 120° is formed in the inner stainless steel with a depth h2 in the range of 0.8 to 1.0 t relative to the thickness t of the stainless steel.
【００１２】本発明では、この内側ステンレス鋼部の開
先形状を上記のように設けることを第一の特徴としてい
る。その理由は、１層潜孤溶接によって健全な内側の溶
接部を得るためである。内側の開先深さｈ２ を０．８
〜１．０ｔに定めた理由は、０．８ｔ以下では幅広で平
滑なビードを得ることが難しい。一方、１．０ｔ以上で
はステンレス鋼の下の低合金鋼部分に溶接アークが直接
作用し、溶接金属部に占める低合金鋼の希釈率が大きく
なり健全な溶接部が得られなくなるためである。また角
度を２０〜１２０°に定めた理由は、２０°以下では開
先断面積が小さくなりすぎ、幅広で平滑な溶接ビードが
得られない。一方、１２０°を超えるとステンレス鋼の
下の低合金鋼部分に直接溶接アークが作用し、その希釈
率が増加するため健全な溶接部が得られないからである
。The first feature of the present invention is that the groove shape of the inner stainless steel portion is provided as described above. The reason for this is to obtain a sound inner weld by single-layer latent arc welding. The inner groove depth h2 is 0.8
The reason why it is set at ~1.0t is that if it is less than 0.8t, it is difficult to obtain a wide and smooth bead. On the other hand, if the welding temperature exceeds 1.0 t, the welding arc will directly act on the low-alloy steel portion below the stainless steel, and the dilution ratio of the low-alloy steel in the weld metal will become large, making it impossible to obtain a sound weld. The reason why the angle is set to 20 to 120 degrees is that if the angle is less than 20 degrees, the cross-sectional area of the groove becomes too small, making it impossible to obtain a wide and smooth weld bead. On the other hand, if the angle exceeds 120°, the welding arc acts directly on the low-alloy steel portion below the stainless steel, and the dilution rate increases, making it impossible to obtain a sound weld.
【００１３】通常の低合金鋼のみを用いたＵＯ鋼管の製
造では、その低合金鋼の希釈率は６０〜７０％程度にな
ると考えられている。そのため、ステンレスクラッド鋼
管の内側１層による潜孤溶接は困難とされている。その
理由は低合金鋼部の希釈率が６０％もあれば潜孤溶接用
ワイヤーとして、ステンレス鋼以上の成分を有する溶接
ワイヤーを使用してもＮｉ，Ｃｒなどの成分が希釈され
、溶接金属に必要なＮｉ，Ｃｒ成分が確保できないばか
りか、溶接金属にマルテンサイト組織が生成して高温割
れが発生するからである。その点、本発明はステンレス
クラッド鋼管の特に内側の１層潜孤溶接における、低合
金鋼の希釈率を低く抑え健全な溶接部の得られる開先形
状としたところに特徴がある。なお、外側の開先形状を
上記の範囲にするのは、高合金鋼用の溶接ワイヤー（後
述）を用いて溶接ビード形状、溶接部を適正にするため
である。[0013] In the production of UO steel pipes using only ordinary low alloy steel, the dilution rate of the low alloy steel is thought to be about 60 to 70%. Therefore, it is considered difficult to perform latent arc welding on the inner single layer of a stainless clad steel pipe. The reason for this is that if the dilution rate of the low-alloy steel part is as high as 60%, even if a welding wire with a composition higher than that of stainless steel is used as a latent arc welding wire, components such as Ni and Cr will be diluted and the weld metal will be diluted. This is because not only the necessary Ni and Cr components cannot be secured, but also a martensitic structure is generated in the weld metal, resulting in hot cracking. In this regard, the present invention is characterized in that the dilution rate of low alloy steel is kept low in single-layer submerged arc welding of stainless clad steel pipes, particularly on the inside, and the groove shape is such that a sound weld can be obtained. The reason why the outer groove shape is set in the above range is to make the weld bead shape and weld part appropriate using a welding wire for high alloy steel (described later).
【００１４】図２は本発明の溶接工程を示すもので、ま
ず外側開先４に低合金鋼用溶接ワイヤーを炭酸ガス溶接
法で仮付溶接６し（図ａ）、次いで内側開先５にステン
レス鋼以上の成分を有する溶接ワイヤーを用いて１層の
潜孤溶接を行なう（図ｂ）が、本発明はこの内側ステン
レス鋼部の開先形状以外に潜孤溶接電流範囲を設けたこ
とに特徴がある。すなわち内側の潜孤溶接電流範囲は４
００〜８００Ａとする必要があり、この溶接電流範囲の
みにおいて溶接欠陥のない低希釈な１層潜孤溶接が可能
である。すなわち、この条件範囲外の高電流側では前記
した内側の開先形状においても低合金鋼部の溶込深さが
深くなり、希釈率が増大して好ましくない。一方、逆に
低電流側では希釈率は小さいが適正な溶接金属量を得る
ために溶接速度を極端に遅くしなければならず非能率と
なる。なお本発明では該内側１層潜孤溶接において、特
にその溶接電極数は１電極に限定せず、２電極であって
も各電極の使用電流範囲を上記の範囲内とすることによ
って、さらに高能率な潜孤溶接法となることは云うまで
もない。FIG. 2 shows the welding process of the present invention. First, a low-alloy steel welding wire is tack-welded 6 to the outer groove 4 by carbon dioxide welding (Figure a), and then to the inner groove 5. One layer of latent arc welding is performed using a welding wire having a composition higher than that of stainless steel (Fig. b), but the present invention provides a latent arc welding current range other than the groove shape of the inner stainless steel part. It has characteristics. In other words, the inner latent arc welding current range is 4
It is necessary to set the welding current to 00 to 800 A, and low-dilution single-layer latent arc welding without welding defects is possible only within this welding current range. That is, on the high current side outside of this condition range, the penetration depth of the low alloy steel portion becomes deep even with the above-mentioned inner groove shape, and the dilution rate increases, which is not preferable. On the other hand, on the low current side, the dilution rate is small, but the welding speed must be extremely slow to obtain an appropriate amount of weld metal, resulting in inefficiency. In addition, in the present invention, the number of welding electrodes in the inner single layer latent arc welding is not particularly limited to one electrode, but even if two electrodes are used, the current range used for each electrode is within the above range, so that even higher welding can be achieved. Needless to say, this is an efficient latent arc welding method.
【００１５】次に内側潜孤溶接後、外側の低合金鋼部を
図２（ｃ）のように１層潜孤溶接８を行なうが、本発明
はこの外側低合金鋼部の潜孤溶接用ワイヤーとしてステ
ンレス鋼以上の成分を有する溶接ワイヤーを使用する方
法に特徴がある。すなわち、本発明者らの検討によれば
、外側の低合金鋼にステンレス鋼以上の成分を有する溶
接ワイヤーを適用した場合のみ本発明溶接法が可能であ
った。その理由は、内側の溶接用にステンレス鋼以上の
成分を有する溶接ワイヤーを適用し、外側の低合金鋼部
に低合金鋼用の溶接ワイヤーを適用した場合、特に外側
潜孤溶接金属８に溶接欠陥が発生した。この溶接欠陥は
外側の溶接金属中に、内側溶接金属のＮｉ，Ｃｒ成分が
希釈によって混ざり合った結果、マルテンサイト組織を
生成したことが原因であり、外側にステンレス鋼以上の
成分を有する溶接ワイヤーを適用することによって、溶
接欠陥の発生しない１層潜孤溶接が可能である。Next, after the inner latent arc welding, the outer low-alloy steel part is subjected to one-layer latent arc welding 8 as shown in FIG. 2(c). The method is characterized by using a welding wire having a composition higher than that of stainless steel. That is, according to the studies of the present inventors, the welding method of the present invention was possible only when a welding wire having a composition higher than that of stainless steel was applied to the outer low alloy steel. The reason for this is that when a welding wire with a composition higher than that of stainless steel is applied to the inner welding, and a welding wire for low-alloy steel is applied to the outer low-alloy steel part, especially the outer latent arc weld metal 8 is welded. A defect has occurred. This welding defect is caused by the Ni and Cr components of the inner weld metal mixing with the outer weld metal due to dilution, resulting in the formation of a martensitic structure, and welding wire that has a higher content than stainless steel on the outside. By applying this method, single layer latent arc welding without welding defects is possible.
【００１６】[0016]
【実施例】表１に示す全厚み２０ｍｍ、そのなかに３ｍ
ｍのＳＵＳ３１６ステンレス鋼をクラッドしたステンレ
スクラッド鋼管に、表２に示すごとき本発明開先および
比較法として従来法の開先形状を作製し、表３に示す溶
接ワイヤーによって、表４に示す溶接条件で溶接部を形
成した。同表にはそれぞれ内側１電極で外側が２電極、
および内側２電極で外側が３電極での実施例を示し、溶
接ワイヤーはすべて表３の通りで、またフラックスはボ
ンドタイプを用いた。[Example] The total thickness shown in Table 1 is 20 mm, and 3 m in it.
The groove shapes of the present invention as shown in Table 2 and the groove shapes of the conventional method as a comparative method were prepared on a stainless steel clad steel pipe clad with SUS316 stainless steel of 500 mm, and the welding conditions shown in Table 4 were prepared using the welding wire shown in Table 3. A welded part was formed. The table shows one electrode on the inside and two electrodes on the outside.
An example was shown in which two electrodes were used on the inside and three electrodes were used on the outside, all welding wires were as shown in Table 3, and bond type flux was used.
【００１７】上記の溶接を行なった後、内側の溶接金属
の化学成分を調査した結果を表５に示す。表中の各末尾
にはシェフラー組織図によるＮｉ，Ｃｒ当量計算結果も
あわせて示す。同表からも明らかなように、本発明法に
よって潜孤溶接を行なった場合の内側の溶接金属の化学
成分はＮｉおよびＣｒ当量とも供試クラッド鋼板のクラ
ッド材と同等、もしくはそれ以上に貴な組成を示したが
、比較法によって潜孤溶接を行なった場合の内側の溶接
金属の化学成分は、供試クラッド鋼板のクラッド材の化
学成分よりも著しく異なった、すなわちクラッド材より
も卑な組成となった。After the above welding was performed, the chemical composition of the inner weld metal was investigated and the results are shown in Table 5. At the end of each table, the Ni and Cr equivalent calculation results based on the Schaeffler organizational chart are also shown. As is clear from the table, the chemical composition of the inner weld metal when submerged arc welding is performed by the method of the present invention is equivalent to or more noble than the cladding material of the test clad steel sheet in both Ni and Cr equivalents. However, the chemical composition of the inner weld metal when latent arc welding was performed using the comparative method was significantly different from the chemical composition of the cladding material of the test clad steel sheet, that is, the chemical composition was more base than that of the cladding material. It became.
【００１８】[0018]
【表１】[Table 1]
【００１９】[0019]
【表２】[Table 2]
【００２０】[0020]
【表３】[Table 3]
【００２１】[0021]
【表４】[Table 4]
【００２２】[0022]
【表５】[Table 5]
【００２３】[0023]
【発明の効果】以上説明したように、本発明法によれば
ステンレスクラッド鋼管のシーム部の突き合わせ溶接に
際し、成分希釈などに起因する欠陥のないステンレス鋼
溶接部を得ることができ、ＵＯＥ法などの造管に即した
安定且つ能率的な生産をすることができる。[Effects of the Invention] As explained above, according to the method of the present invention, when butt welding the seam portion of stainless clad steel pipes, it is possible to obtain a stainless steel welded portion free from defects caused by component dilution, etc. It is possible to perform stable and efficient production in line with pipe manufacturing.
【図１】ステンレスクラッド鋼の開先を示す、[Figure 1] Showing the groove of stainless clad steel,
【図２】
本発明の溶接工程および溶接例を示す図である。[Figure 2]
It is a figure which shows the welding process of this invention, and a welding example.
１ 外側低合金鋼
２ 内側ステンレス鋼
３ シーム突き合わせ部
４ 外側開先
５ 内側開先
６ 仮付溶接部
７ 内側潜孤溶接部
８ 外側潜孤溶接部1 Outer low alloy steel
2 Inner stainless steel 3 Seam butt part
4 Outer bevel 5 Inner bevel
6 Tack welding part 7 Inner latent arc welding part
8 Outer latent arc welding part
Claims (2)
ッド鋼板を内側がステンレス鋼となる如く管状に成形し
、その突き合わせ部にＸ型の開先加工をほどこして該Ｘ
型開先部をシーム溶接してクラッド鋼管を製造するにあ
たり、内側の開先深さがステンレス鋼厚みの８０〜１０
０％とし、角度２０〜１２０°となる開先を設け、外側
開先部を仮付溶接した後、内側ステンレス鋼開先部を溶
接電流が４００〜８００Ａの範囲で、内側および外側と
もステンレス鋼以上の成分を有する溶接ワイヤーを用い
、それぞれ１層の潜孤溶接することを特徴とするステン
レスクラッド鋼管の溶接方法。Claim 1: A clad steel plate made of low alloy steel and stainless steel is formed into a tubular shape so that the inside is made of stainless steel, and an X-shaped bevel is formed at the butt part.
When manufacturing clad steel pipe by seam welding the mold groove, the inner groove depth is 80 to 10 mm thick than the stainless steel thickness.
0%, a groove with an angle of 20 to 120 degrees is prepared, and after tack welding the outer groove, the inner stainless steel groove is welded with stainless steel on the inside and outside at a welding current of 400 to 800 A. A method for welding stainless clad steel pipes, characterized in that one layer of latent arc welding is performed using welding wires having the above components.
であることを特徴とする請求項１記載のステンレスクラ
ッド鋼管の溶接方法。[Claim 2] The thickness of the inner stainless steel is 2 to 4 mm.
The method of welding stainless clad steel pipes according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7125591A JP2563684B2 (en) | 1991-04-03 | 1991-04-03 | Welding method of stainless clad steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7125591A JP2563684B2 (en) | 1991-04-03 | 1991-04-03 | Welding method of stainless clad steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04313468A true JPH04313468A (en) | 1992-11-05 |
| JP2563684B2 JP2563684B2 (en) | 1996-12-11 |
Family
ID=13455422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7125591A Expired - Lifetime JP2563684B2 (en) | 1991-04-03 | 1991-04-03 | Welding method of stainless clad steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2563684B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391685C (en) * | 2005-05-26 | 2008-06-04 | 渤海船舶重工有限责任公司 | Assembly method of positioning chock for ensuring gap at root parts butt jointing tubes in use for welding |
| CN101913014A (en) * | 2010-08-24 | 2010-12-15 | 中冶集团华冶资源开发有限责任公司 | Welding method of stainless steel composite board |
| CN102275030A (en) * | 2011-07-25 | 2011-12-14 | 上海第一机床厂有限公司 | Butt welding method of austenitic stainless steel and nickel-based alloy |
| CN112719514A (en) * | 2020-11-17 | 2021-04-30 | 十四冶建设集团云南安装工程有限公司 | Method for welding red copper plate and red copper stranded wire by adopting carbon arc welding |
| CN114192943A (en) * | 2021-11-08 | 2022-03-18 | 中石化南京化工机械有限公司 | Welding method for austenitic stainless steel cladding |
-
1991
- 1991-04-03 JP JP7125591A patent/JP2563684B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391685C (en) * | 2005-05-26 | 2008-06-04 | 渤海船舶重工有限责任公司 | Assembly method of positioning chock for ensuring gap at root parts butt jointing tubes in use for welding |
| CN101913014A (en) * | 2010-08-24 | 2010-12-15 | 中冶集团华冶资源开发有限责任公司 | Welding method of stainless steel composite board |
| CN102275030A (en) * | 2011-07-25 | 2011-12-14 | 上海第一机床厂有限公司 | Butt welding method of austenitic stainless steel and nickel-based alloy |
| CN112719514A (en) * | 2020-11-17 | 2021-04-30 | 十四冶建设集团云南安装工程有限公司 | Method for welding red copper plate and red copper stranded wire by adopting carbon arc welding |
| CN114192943A (en) * | 2021-11-08 | 2022-03-18 | 中石化南京化工机械有限公司 | Welding method for austenitic stainless steel cladding |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2563684B2 (en) | 1996-12-11 |
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