JPH08152291A - Welding structure of tube to header and welding method - Google Patents
Welding structure of tube to header and welding methodInfo
- Publication number
- JPH08152291A JPH08152291A JP6294320A JP29432094A JPH08152291A JP H08152291 A JPH08152291 A JP H08152291A JP 6294320 A JP6294320 A JP 6294320A JP 29432094 A JP29432094 A JP 29432094A JP H08152291 A JPH08152291 A JP H08152291A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- header
- welding
- tube
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
- F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Heat-Exchange And Heat-Transfer (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、高温高圧で運転される
ボイラ、原子力、化学プラント等における熱交換器の管
と管寄せの溶接、あるいは管と管板の溶接に好適な溶接
構造および溶接方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding structure and welding suitable for welding pipes and pipe heads of heat exchangers in boilers, nuclear power plants, chemical plants, etc. operated at high temperature and high pressure, or welding pipes and pipe sheets. Regarding the method.
【0002】[0002]
【従来の技術】ボイラ、原子力、化学プラントは数多く
の熱交換器で構成されている。熱交換器においては、配
管から管への内部流体の分配及び管から配管への内部流
体への内部流体の合流に管寄せ構造あるいは管板構造が
採用されている。Boilers, nuclear power plants, and chemical plants are composed of many heat exchangers. In the heat exchanger, a pipe approach structure or a tube plate structure is adopted for distributing the internal fluid from the pipe to the pipe and joining the internal fluid to the internal fluid from the pipe to the pipe.
【0003】このような管寄せあるいは管板で厚肉のも
のは熱変形や熱応力防止の観点から線膨張係数が小さ
く、熱伝達率の大きいフェライト鋼を使用するのが一般
的である。一方、薄肉の管には使用条件によってフェラ
イト鋼管あるいはオーステナイト鋼管が使用される。フ
ェライト鋼管寄せとフェライト鋼管の一般的な溶接構造
例について説明する。図4に示すようにフェライト鋼管
寄せ1を削り込んで凹状の溶接開先5を設け、この溶接
開先5に直接フェライト鋼管2先端を当接させ、両材
1,2を直接に隅肉溶接により接合して図5の構造を得
る。一方、オーステナイト鋼管の場合は、図6に示すよ
うに、一旦、オーステナイト鋼管3の先端に管寄せと同
じ材質のフェライト鋼管2を溶接しておき、このフェラ
イト鋼管2とフェライト鋼管寄せ1を隅肉溶接で接合す
る構造がとられる。これは、管と管寄せの溶接部がフェ
ライト鋼とオーステナイト鋼の異材溶接となった場合、
以下に示すような問題が生じるためである。Ferrite steel having a small coefficient of linear expansion and a large coefficient of heat transfer is generally used for such a pipe head or a tube plate having a large wall thickness from the viewpoint of preventing thermal deformation and thermal stress. On the other hand, a ferritic steel pipe or an austenitic steel pipe is used for the thin-walled pipe depending on the use conditions. A general welded structure example of a ferritic steel pipe header and a ferritic steel pipe will be described. As shown in FIG. 4, the ferritic steel pipe header 1 is ground to form a concave welding groove 5, and the tip of the ferritic steel pipe 2 is directly brought into contact with the welding groove 5 to directly fillet weld both materials 1 and 2. To obtain the structure of FIG. On the other hand, in the case of an austenitic steel pipe, as shown in FIG. 6, a ferrite steel pipe 2 made of the same material as the header is welded to the tip of the austenitic steel pipe 3, and the ferrite steel pipe 2 and the ferrite steel header 1 are filleted. The structure of joining by welding is adopted. This is because when the weld between the pipe and the header is a dissimilar material weld of ferritic steel and austenitic steel,
This is because the following problems occur.
【0004】まず第1に構造上の問題であるが、ボイラ
の管寄せと伝熱管の構造を例にとり、それを図7に示
す。管寄せ9は、ボイラ運転時に高温となり、長手方向
に膨張するが、管寄せ9に固定された伝熱管10は天井
壁管11の拘束を受け、図中矢印で示す方向に曲げ荷重
を受ける。このため管寄せ9と伝熱管10の溶接部は最
大の曲げモーメントを受ける。さらに従来構造の場合、
隅肉溶接であるために、図5で示したように、管寄せ1
の溶接開先5面と管2の先端面とが当接した部分は溶融
せず、この未溶着部7が切欠きとして残る。このように
管寄せと管の溶接部はもっとも応力条件の厳しい部位で
あり、フェライト鋼とオーステナイト鋼の線膨張係数の
違いから大きな熱応力の発生する異材溶接構造は、機器
の信頼性の面から採用できなかった。First of all, regarding the structural problem, the structure of the boiler header and heat transfer tube is shown as an example in FIG. The pipe header 9 becomes hot during boiler operation and expands in the longitudinal direction, but the heat transfer pipe 10 fixed to the pipe header 9 is constrained by the ceiling wall pipe 11 and receives a bending load in the direction indicated by the arrow in the figure. For this reason, the welded portion of the header 9 and the heat transfer tube 10 receives the maximum bending moment. Furthermore, in the case of the conventional structure,
Since fillet welding is performed, as shown in FIG.
The portion where the welding groove surface 5 and the tip end surface of the pipe 2 contact each other does not melt, and this unwelded portion 7 remains as a notch. In this way, the pipe header and the welded part of the pipe are the parts with the most severe stress conditions, and the dissimilar material welded structure in which a large thermal stress is generated due to the difference in the linear expansion coefficient of ferritic steel and austenitic steel I could not hire.
【0005】次に溶接施工の問題であるが、通常、フェ
ライト鋼とオーステナイト鋼の異材溶接には、両材料の
中間的な線膨張係数を有するNi基のインコネル系溶接
材料を使用する。インコネル溶接金属は溶融状態におい
て表面張力が大きく、狭い開先面への濡れ性が悪いた
め、図5に示すような開先角度の狭い隅肉溶接ではルー
ト部で融合不良やブローホールが多く発生する。さらに
図5で示した未溶着部7が切欠きとして作用し、未溶着
部を起点とした溶接高温割れの発生する頻度が高い。以
上述べたような理由から、フェライト鋼管寄せに直接溶
接する部分の管材としては必ずフェライト鋼が用いられ
てきた。Next, regarding the problem of welding work, usually, for dissimilar material welding of ferritic steel and austenitic steel, a Ni-based Inconel welding material having a linear expansion coefficient intermediate between those materials is used. Inconel weld metal has a large surface tension in the molten state and has poor wettability to a narrow groove face. Therefore, in fillet welding with a narrow groove angle as shown in Fig. 5, many fusion defects and blow holes occur at the root part. To do. Furthermore, the unwelded portion 7 shown in FIG. 5 acts as a notch, and high-temperature welding hot cracking starting from the unwelded portion is frequently generated. For the reasons described above, ferritic steel has always been used as the pipe material for the portion directly welded to the ferritic steel header.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、近年の
ボイラの大型化や蒸気条件の高温・高圧化に伴い、管寄
せと管の溶接部では従来にもまして応力条件が過酷化し
つつある。従来の経験では、管側の溶接止端部から10
mmの範囲に高温疲労あるいはクリープによる損傷が集
中しており、き裂に至る場合もあった。今後、蒸気温度
が高温化した場合、従来のフェライト鋼管による溶接構
造では強度不足となる場合も生じる。However, with the recent increase in the size of boilers and the high temperature and high pressure of steam conditions, the stress conditions are becoming severer in the weld portion between the header and the pipe than ever before. In the past experience, it was 10 from the weld toe on the pipe side.
Damage due to high temperature fatigue or creep was concentrated in the range of mm, which sometimes led to cracks. In the future, if the steam temperature rises, the conventional welded structure using a ferritic steel pipe may become insufficient in strength.
【0007】本発明の目的は、疲労あるいはクリープに
対する耐力を向上させた、信頼性の高い管寄せと管の溶
接構造及び溶接方法を提供することにある。It is an object of the present invention to provide a highly reliable pipe head and pipe welding structure and welding method, which have improved resistance to fatigue or creep.
【0008】[0008]
【課題を解決するための手段】本発明は、概して、管寄
せとの溶接部近傍の部分にオーステナイト鋼管を使用
し、管寄せ側を削り込んで溶接開先を形成し、あるいは
Ni基合金のリングを溶接開先部に挿入し、Ni基合金
の溶接材料を用いて突合せ溶接するものである。SUMMARY OF THE INVENTION In general, the present invention uses an austenitic steel pipe in the vicinity of a welded portion with a header and forms a weld groove by cutting the header side or a Ni-based alloy. The ring is inserted into the weld groove and butt-welded using a welding material of Ni-based alloy.
【0009】上記目的を達成するために、本発明の管と
管寄せの溶接構造は、フェライト鋼の管をフェライト鋼
の管寄せの板面に立てて接続する管と管寄せの溶接構造
であって、これら鋼管と管寄せとの間にオーステナイト
鋼の管を介在させ、このオーステナイト鋼の管は、この
管とフェライト鋼の管寄せとの溶接止端部から管外径の
1/2以上離れた位置まで延びたことを特徴とし、そし
てフェライト鋼の管寄せとオーステナイト鋼の管の接続
部は、管寄せの板面側の管溶接部位置の周辺を削り込ん
で環状の突起部を形成し、またオーステナイト鋼の管の
先端部を加工して管寄せの突起部に対向する突起部を含
む開先を形成し、これら両突起部を突き合わせて突合せ
開先を形成し、この突合せ開先を溶接して形成するもの
である。In order to achieve the above object, the welded structure of the pipe and the header of the present invention is a welded structure of the pipe and the header in which a ferritic steel pipe is erected on a plate surface of the ferrite steel header and connected. An austenitic steel pipe is interposed between the steel pipe and the header, and the austenitic steel pipe is separated from the weld toe of the pipe and the ferrite steel header by at least ½ of the pipe outer diameter. The ferritic steel header and austenitic steel pipe joints are machined around the pipe weld side on the plate side of the header to form an annular protrusion. In addition, the tip of the austenitic steel pipe is processed to form a groove including a protrusion facing the protrusion of the header, and these protrusions are butted to form a butt groove. It is formed by welding.
【0010】突合せ開先は、断面が外広がりの台形状
で、この台形の底辺を形成する前記両突起部を溶接のル
ート部とし、オーステナイト鋼の管側のルート部をフェ
ライト鋼の管寄せ側のルート部よりも長くするのが好ま
しい。または、両突起部間にオーステナイト鋼の管より
Ni含有量の多いオーステナイト鋼またはNi基材料か
らなるリングを挿入し、溶接してもよい。The butt groove has a trapezoidal shape in which the cross section expands outward, and both of the projections forming the bottom of the trapezoid are used as the welding roots, and the root side of the austenitic steel pipe side is the ferritic steel side. It is preferable to make it longer than the root part of the. Alternatively, a ring made of austenitic steel or Ni-based material having a Ni content higher than that of an austenitic steel tube may be inserted between both protrusions and welded.
【0011】上記目的を達成するために、本発明の管と
管寄せの溶接方法は、上記の溶接構造におけるフェライ
ト鋼の管寄せとオーステナイト鋼の管とを、Ni基合金
からなる溶接材料を用いて溶接することを特徴とする。In order to achieve the above object, the welding method of the pipe and the header of the present invention uses a welding material made of a Ni-based alloy for the header of the ferritic steel and the pipe of the austenitic steel in the above welded structure. It is characterized by welding.
【0012】[0012]
【作用】管と管寄せの溶接継ぎ手部において最も応力条
件の厳しい溶接止端部にフェライト鋼より高温強度に優
れたオーステナイト鋼からなる管を用いるため、疲労や
クリープによる損傷を低減することができる。そしてオ
ーステナイト鋼管を溶接止端部から管外径の1/2以上
延ばすことにより応力条件の厳しい範囲をカバーする。
また突合せ溶接とするために隅肉の場合に較べて開先角
度を広くとることができ、インコネル系等Ni基の溶接
材料を用いる溶接施工においても溶接欠陥を生じること
なく接合することができる。[Operation] Since the weld toes of pipes and pipe headers are made of austenitic steel, which has better high-temperature strength than ferritic steel, is used at the weld toe where the stress conditions are the most severe, damage due to fatigue and creep can be reduced. . Then, the austenitic steel pipe is extended from the weld toe portion by 1/2 or more of the pipe outer diameter to cover a severe range of stress conditions.
Further, since the butt welding is performed, the groove angle can be widened as compared with the case of the fillet, and the welding can be performed without causing a welding defect even in the welding work using the Ni-based welding material such as Inconel system.
【0013】[0013]
【実施例】以下、本発明の一実施例を具体的に説明す
る。図1はフェライト鋼管2をフェライト鋼管寄せ1
に、オーステナイト鋼管3を介して接合する場合の溶接
構造の断面図である。フェライト鋼管2の先端に、高温
強度に優れたオーステナイト鋼管3をインコネル系の溶
接材料を用いて突合せ溶接しておく。オーステナイト鋼
管3の他端には突合せ溶接用の溶接開先5’を加工して
おくが、開先角度αはできるだけ大きく、少なくとも4
5°以上とする。一方、フェライト鋼管寄せ1の管溶接
位置外面には、研削により凹状の溶接開先5を加工し、
その中央にオーステナイト鋼管3のルート部6’に合う
ように凸状のルート部6を設ける。このときルート部
6’の幅(w3)が、ルート6のそれ(w1)より広くな
るように、好ましくはルート6の幅の3倍程度(w3≒
w1)になるように加工する。溶接材料にはインコネル
系溶接材料等、Ni基の溶接材料を用い。初層でルート
部6及び6’を溶かすように溶接する。さらに開先内を
満たすように溶接金属を積層し、図2に示す完全溶け込
みの溶接構造を得る。ところでオーステナイト鋼管3の
長さは、フェライト鋼管2との間のインコネル溶接金属
4の端部14(溶接止端部)からフェライト鋼管寄せ1
との間の溶接金属4’の端部13(溶接止端部)までの
距離が少なくとも管外径の1/2以上となるように予め
設定する。EXAMPLE An example of the present invention will be specifically described below. Figure 1 shows ferritic steel pipe 2
2 is a sectional view of a welded structure in the case of joining via an austenitic steel pipe 3. FIG. An austenitic steel pipe 3 excellent in high-temperature strength is butt-welded to the tip of the ferritic steel pipe 2 using an Inconel welding material. A welding groove 5'for butt welding is machined on the other end of the austenitic steel pipe 3, but the groove angle α is as large as possible,
5 ° or more. On the other hand, on the outer surface of the pipe welding position of the ferritic steel pipe header 1, a concave welding groove 5 is processed by grinding,
A convex root portion 6 is provided in the center so as to match the root portion 6 ′ of the austenitic steel pipe 3. At this time, the width (w 3 ) of the route portion 6 ′ is preferably wider than that (w 1 ) of the route 6, preferably about 3 times the width of the route 6 (w 3 ≈).
w 1 ) to be processed. A Ni-based welding material such as an Inconel welding material is used as the welding material. Weld so as to melt the root portions 6 and 6'in the first layer. Further, the weld metal is laminated so as to fill the inside of the groove to obtain a completely melted welded structure shown in FIG. By the way, the length of the austenitic steel pipe 3 is from the end 14 (welding toe) of the Inconel weld metal 4 between the ferrite steel pipe 2 and the ferrite steel pipe 1
It is preset so that the distance to the end 13 (welding toe) of the weld metal 4 ′ between and is at least ½ of the pipe outer diameter.
【0014】本実施例の場合、まず溶接施工の面では開
先角度を大きくとり、オーステナイト鋼管3側のルート
部も広くしているため溶接トーチが入り易く、狭隘な部
分の溶接にもかかわらず比較的容易に施工できる。また
オーステナイト鋼管3側のルート部6’が優先的に溶融
し、特に初層で問題となり易い溶接金属中のNi成分の
希釈による強度低下の防止にも効果がある。次に形状面
においても、完全溶け込みとなって図5で示したような
未溶着部7はなくなり、熱応力の発生し易い異材溶接部
の信頼性を大きく向上させることになる。曲げ等、応力
的にもっとも厳しい管の溶接止端部付近は高温強度の優
れたオーステナイト鋼のため、従来のフェライト鋼に較
べて耐力が向上することはもちろんである。In the case of the present embodiment, first, in terms of welding work, the groove angle is made large and the root portion on the side of the austenitic steel pipe 3 is also made wide so that the welding torch is easy to enter and despite the welding of a narrow portion. Can be constructed relatively easily. Further, the root portion 6 ′ on the austenitic steel pipe 3 side is preferentially melted, and it is also effective in preventing the strength from being reduced due to the dilution of the Ni component in the weld metal, which tends to cause a problem particularly in the first layer. Next, also in terms of the shape, the completely welded portion does not have the unwelded portion 7 as shown in FIG. 5, and the reliability of the dissimilar material weld portion where thermal stress is likely to occur is greatly improved. Since the austenitic steel with excellent high-temperature strength is present in the vicinity of the weld toe of the pipe where stress is the most severe, such as bending, the yield strength is of course improved compared to conventional ferritic steel.
【0015】本実施例では管側がフェライト鋼管の場合
について説明したが、管側が元々オーステナイト鋼管の
場合でも図1に示す開先形状を用いて直接フェライト鋼
管寄せに溶接すればよいし、より高温強度の高い別のオ
ーステナイト鋼管の単管をフェライト鋼管寄せに溶接
し、これを介してオーステナイト鋼管を溶接すれば、さ
らに強度面で優れた溶接構造が得られる。In this embodiment, the case where the pipe side is the ferritic steel pipe has been described. However, even when the pipe side is originally the austenitic steel pipe, the groove shape shown in FIG. If another single austenitic steel pipe having a high temperature is welded to the ferritic steel header, and the austenitic steel pipe is welded through this, a welded structure with even better strength can be obtained.
【0016】本発明による他の実施例を図3に示す。本
実施例は図1と同様の開先形状で、同様の効果をねらっ
たものであるが、オーステナイト鋼管側のルート部6’
とフェライト鋼管寄せ側のルート部6の間に、Ni含有
量の多いオーステナイト鋼またはNi基材料のリング8
を挟み、このリング8を溶かすように溶接するものであ
る。その後に、開先内を満たすように溶接金属を積層す
る溶接施工を行う。本実施例では、図1に示す溶接構造
の場合よりも、リング8に含むNiにより溶接金属中の
Ni量を高め、溶接金属の高温強度をより向上させるこ
とができる。Another embodiment according to the present invention is shown in FIG. The present embodiment has a groove shape similar to that of FIG. 1 and aims for the same effect, but the root portion 6'on the austenitic steel pipe side is provided.
Ring 8 of austenitic steel or Ni-based material having a high Ni content between the root part 6 on the side closer to the ferritic steel pipe
And the ring 8 is welded so as to melt. After that, welding is carried out by laminating the weld metal so as to fill the inside of the groove. In the present embodiment, the amount of Ni in the weld metal can be increased by the Ni contained in the ring 8 and the high temperature strength of the weld metal can be further improved, as compared with the case of the weld structure shown in FIG.
【0017】以上、図1〜図3を用いて本発明による突
合せ溶接構造の場合の実施例を説明したが、図4または
図6に示した隅肉溶接の場合でも、溶接開先部にNi含
有量の多いオーステナイト鋼またはNi基材料のリング
を挿入し、インコネル系溶接材料等、Ni基の溶接材料
を用いて初層でルート部及びリングを溶かすように溶接
することによっても、施工可能である。この場合、未溶
着部は残るものの、従来構造と同じ開先構造を採用でき
るという長所がある。Although the embodiment of the butt welding structure according to the present invention has been described above with reference to FIGS. 1 to 3, even in the case of the fillet welding shown in FIG. It can also be installed by inserting a ring of austenitic steel or Ni-based material with a high content and welding the Ni-based welding material such as Inconel-based welding material so that the root part and the ring are melted in the first layer. is there. In this case, although the unwelded portion remains, there is an advantage that the same groove structure as the conventional structure can be adopted.
【0018】[0018]
【発明の効果】本発明によれば、応力条件の過酷な管寄
せと管の溶接部に高温強度のすぐれたオーステナイト鋼
を用いるので、溶接部の疲労やクリープによる損傷を低
減することができる。また溶接部は開先角度を大きくと
れる突合せ開先を用いるので、溶接が容易になり溶接施
工上の問題を生じることなく、本発明の溶接構造を有す
る熱交換器等の機器の性能向上及び信頼性向上に大きな
効果がある。According to the present invention, since the austenitic steel having excellent high temperature strength is used for the welded portion of the pipe under severe stress conditions and the welded portion of the pipe, the damage of the welded portion due to fatigue and creep can be reduced. In addition, since the welded portion uses a butt groove that allows a large groove angle, welding is facilitated and problems in welding work do not occur, and the performance and reliability of equipment such as a heat exchanger having the welded structure of the present invention are improved. It has a great effect on improving the sex.
【図1】本発明になる管寄せと管の溶接構造を示す断面
図である。FIG. 1 is a sectional view showing a welded structure of a header and a pipe according to the present invention.
【図2】本発明による溶接構造で、フェライト鋼管寄せ
とオーステナイト鋼管との溶接部を示す断面図である。FIG. 2 is a cross-sectional view showing a welded portion between a ferritic steel pipe header and an austenitic steel pipe in a welded structure according to the present invention.
【図3】本発明の他の実施例を示す断面図である。FIG. 3 is a sectional view showing another embodiment of the present invention.
【図4】従来の管寄せと管の溶接構造を示す断面図であ
る。FIG. 4 is a cross-sectional view showing a conventional pipe header and pipe welding structure.
【図5】従来の溶接構造で、管寄せと管とを接合する隅
肉溶接を示す断面図である。FIG. 5 is a cross-sectional view showing fillet welding for joining a header and a pipe with a conventional welding structure.
【図6】従来の管寄せと管の溶接構造を示す断面図であ
る。FIG. 6 is a cross-sectional view showing a conventional welded structure of a header and a pipe.
【図7】管寄せと伝熱管の構造例を示す図である。FIG. 7 is a diagram showing an example of the structure of a tube drawer and a heat transfer tube.
1 フェライト鋼管寄せ 2 フェライト鋼管 3 オーステナイト鋼管 4 インコネル系溶接金属 5 溶接開先 6,6’ ルート部 8 リング 9 管寄せ 13,14 溶接止端部 1 Ferrite Steel Pipe Head 2 Ferrite Steel Pipe 3 Austenite Steel Pipe 4 Inconel Weld Metal 5 Weld Groove 6,6 'Root 8 Ring 9 Pipe Head 13,14 Weld Toe
Claims (5)
せの板面に立てて接続する管と管寄せの溶接構造におい
て、これら鋼管と管寄せとの間にオーステナイト鋼の管
を介在させ、このオーステナイト鋼の管は、この管とフ
ェライト鋼の管寄せとの溶接止端部から管外径の1/2
以上離れた位置まで延ばしたことを特徴とする管と管寄
せの溶接構造。1. A welded structure of a pipe and a pipe in which a ferritic steel pipe is erected on a plate surface of a ferritic steel pipe header and connected thereto, and an austenitic steel pipe is interposed between the steel pipe and the pipe header. The austenitic steel pipe has a half of the pipe outer diameter from the weld toe of this pipe and the ferritic steel header.
A welded structure of a pipe and a pipe head, which is characterized in that it is extended to a position separated from the above.
溶接部位置の周辺を削り込んで環状の突起部を形成する
一方、前記オーステナイト鋼の管の先端部を加工して前
記管寄せの突起部に対向する突起部を含む開先を形成
し、両突起部を突き合わせて突合せ開先を形成し、この
突合せ開先を溶接することを特徴とする請求項1記載の
管と管寄せの溶接構造。2. The ferritic steel pipe header plate surface is machined around the position of the welded portion of the pipe to form an annular protrusion, while the austenitic steel pipe is processed by processing the tip end of the pipe. 2. The pipe according to claim 1, wherein a groove including a protrusion facing the protrusion is formed, the protrusions are butted to form a butt groove, and the butt groove is welded. Welded structure.
形状で、該台形の底辺を形成する前記突起部を溶接のル
ート部とし、前記オーステナイト鋼の管側のルート部を
前記フェライト鋼の管寄せ側のルート部よりも長くする
ことを特徴とする請求項2記載の溶接構造。3. The butt groove has a trapezoidal shape with an outwardly expanding cross section, the protrusion forming the base of the trapezoid is used as a welding root, and the pipe-side root of the austenitic steel is used as the ferritic steel. 3. The welded structure according to claim 2, wherein the welded structure is made longer than the root portion on the pipe drawing side.
鋼よりNi含有量の多いオーステナイト鋼またはNi基
材料からなるリングを挿入することを特徴とする請求項
2記載の溶接構造。4. The welded structure according to claim 2, wherein a ring made of an austenitic steel having a Ni content higher than that of the austenitic steel or a Ni-based material is inserted between the both protrusions.
接構造における前記フェライト鋼の管寄せと前記オース
テナイト鋼の管とを、Ni基合金からなる溶接材料を用
いて溶接することを特徴とする管と管寄せの溶接方法。5. The welded structure of the ferritic steel and the austenitic steel in the welded structure according to claim 1, wherein the welded material is made of a Ni-based alloy. Welding method for pipe and header.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6294320A JPH08152291A (en) | 1994-11-29 | 1994-11-29 | Welding structure of tube to header and welding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6294320A JPH08152291A (en) | 1994-11-29 | 1994-11-29 | Welding structure of tube to header and welding method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08152291A true JPH08152291A (en) | 1996-06-11 |
Family
ID=17806176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6294320A Pending JPH08152291A (en) | 1994-11-29 | 1994-11-29 | Welding structure of tube to header and welding method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08152291A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010041577A1 (en) * | 2008-10-07 | 2010-04-15 | 三菱重工業株式会社 | Welded header/nozzle structure |
-
1994
- 1994-11-29 JP JP6294320A patent/JPH08152291A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010041577A1 (en) * | 2008-10-07 | 2010-04-15 | 三菱重工業株式会社 | Welded header/nozzle structure |
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