JPH0592281A - Corrosion resistance improvement method for welded parts through container - Google Patents
Corrosion resistance improvement method for welded parts through containerInfo
- Publication number
- JPH0592281A JPH0592281A JP3040317A JP4031791A JPH0592281A JP H0592281 A JPH0592281 A JP H0592281A JP 3040317 A JP3040317 A JP 3040317A JP 4031791 A JP4031791 A JP 4031791A JP H0592281 A JPH0592281 A JP H0592281A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- container
- corrosion
- welded portion
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000007797 corrosion Effects 0.000 title claims abstract description 33
- 238000005260 corrosion Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims abstract description 46
- 238000003466 welding Methods 0.000 claims abstract description 11
- 239000012809 cooling fluid Substances 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 230000035515 penetration Effects 0.000 abstract description 7
- 238000005253 cladding Methods 0.000 abstract description 6
- 230000002950 deficient Effects 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 101150000971 SUS3 gene Proteins 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- Laser Beam Processing (AREA)
Abstract
(57)【要約】
【目的】 容器貫通配管溶接部の耐食性改善方法に係
り、特に、容器貫通管を取り付けている溶接部を解体す
ることなく、溶接部近傍に欠陥部が生じた場合やその恐
れがある場合の漏洩防止等の補修や健全性の向上を図る
ものである。
【構成】溶接部の周囲に冷却用流体を介在させた状態
で、溶接部の形成範囲を越えて、容器貫通管の内面に耐
食性クラッド層を形成することにより、クラッド層形成
時の熱を利用して、管壁に内外の温度差及びこれに基づ
く管壁の外面への圧縮残留応力の付与を行ない、管壁外
面の応力腐食割れ等の発生を効果的に防止し、そして、
容器貫通管の内面に耐食性クラッド層を形成することに
よって、管壁内面に耐食性を付与することができるもの
である。
(57) [Abstract] [Purpose] The present invention relates to a method for improving the corrosion resistance of a welded portion of a container penetrating pipe, and in particular, when there is a defective portion near the welded portion without disassembling the welded portion where the container penetrating pipe is attached or In case of fear, it is intended to prevent leakage and improve the soundness. [Composition] Utilizing heat during formation of the cladding layer by forming a corrosion-resistant cladding layer on the inner surface of the vessel through pipe beyond the weld formation range with a cooling fluid interposed around the welding portion. Then, by applying a compressive residual stress to the outer surface of the pipe wall based on the temperature difference between the inside and the outside of the pipe wall and the outer surface of the pipe wall, effectively preventing the occurrence of stress corrosion cracking on the outer surface of the pipe wall, and
By forming a corrosion-resistant clad layer on the inner surface of the container penetration tube, corrosion resistance can be imparted to the inner surface of the tube wall.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、容器貫通配管溶接部の
耐食性改善方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the corrosion resistance of a welded portion through a container.
【０００２】[0002]
【従来の技術】原子力発電関連プラント、各種エネルギ
関連プラント、化学プラント、火力発電プラント等に
は、容器を貫通した状態の配管、つまり、容器貫通管が
使用される。2. Description of the Related Art In nuclear power generation related plants, various energy related plants, chemical plants, thermal power generation plants, etc., pipes penetrating a container, that is, container penetrating pipes are used.
【０００３】例えば、図７に示すように、沸騰水型原子
炉における原子炉圧力容器には、その容器壁( 容器下鏡
部 )１に明けた配管貫通用穴２を経由して容器貫通管(
配管)３が貫通しているとともに、配管貫通用穴２を上
方に延長するように、容器壁１の内底部にスタブチュー
ブ４が立設され、該スタブチューブ４における上縁部と
容器貫通管３の外周部との間が、溶接部５によって一体
化されており、容器貫通管３は、例えば、原子炉の状態
を検出するための各種センサの信号伝達等を行なってい
る。For example, as shown in FIG. 7, a reactor pressure vessel in a boiling water reactor has a vessel penetrating pipe through a pipe penetrating hole 2 opened in a vessel wall (bottom mirror portion of the vessel) 1. (
Tubing 3 penetrates and a stub tube 4 is erected on the inner bottom portion of the container wall 1 so as to extend the piercing hole 2 upward, and the upper edge of the stub tube 4 and the container penetration pipe The outer peripheral portion of 3 is integrated with a welded portion 5, and the vessel penetrating pipe 3 performs, for example, signal transmission of various sensors for detecting the state of the nuclear reactor.
【０００４】このような容器貫通管３は、機械的強度の
優れた容器壁１及びスタブチューブ４に取り付けられて
いるために、容器貫通管３の伸縮や曲げによる変形力の
影響が、溶接部５やその近傍の配管壁に現れ易く、十分
な信頼性を確保することが要求され、また、定期検査時
等において、溶接部５あるいはその近傍の配管壁の状態
を検査することが望ましい。Since such a container penetrating pipe 3 is attached to the container wall 1 and the stub tube 4 having excellent mechanical strength, the influence of the deforming force due to expansion and contraction or bending of the container penetrating pipe 3 is affected by the welded portion. 5 is likely to appear on the pipe wall 5 and its vicinity, and it is required to ensure sufficient reliability, and it is desirable to inspect the condition of the welded part 5 or the pipe wall in the vicinity thereof at the time of regular inspection.
【０００５】一方、図８に示すように、溶接部５の下部
近傍の配管壁に、クラック等の欠陥部Ｘが生じた場合
は、容器貫通管３の内部流体が欠陥部Ｘを経由して下鏡
アニュラス部６に流れ落ちる可能性があり、この場合に
は溶接部５の部分を解体し、新規の配管を再溶接によっ
て取り付ける等の補修方法が考えられている。On the other hand, as shown in FIG. 8, when a defective portion X such as a crack occurs on the pipe wall near the lower portion of the welded portion 5, the internal fluid of the container penetrating pipe 3 passes through the defective portion X. There is a possibility that it will flow down to the lower mirror annulus portion 6, and in this case, a repairing method such as disassembling the portion of the welded portion 5 and attaching a new pipe by rewelding is considered.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、このよ
うな補修方法は、非常に大掛かりなものとなり、補修対
象となる容器貫通管３が、前述した原子炉圧力容器に取
り付けられている場合であると、原子炉の運転開始後に
おいては、補修作業従事者の放射線被曝線量を十分に管
理する必要性が生じる。However, such a repair method is very large-scale, and it is the case where the vessel through pipe 3 to be repaired is attached to the reactor pressure vessel described above. After the operation of the nuclear reactor, it is necessary to adequately manage the radiation exposure dose of repair workers.
【０００７】したがって、容器貫通管３の管壁等に欠陥
部Ｘが生じる恐れがある場合には、例えば、溶接部５を
解体することなく、容器貫通管３の内部からその管壁等
の耐食性を改善することができると好都合であり、かか
る技術の開発が要望されている。Therefore, when there is a possibility that a defective portion X is formed on the pipe wall of the container penetrating pipe 3, for example, the corrosion resistance of the pipe wall and the like from the inside of the container penetrating pipe 3 without disassembling the welding portion 5. It would be advantageous to be able to improve and the development of such technology is desired.
【０００８】本発明は、このような事情に鑑みてなされ
たもので、容器貫通管を取り付けている溶接部を解体す
ることなく容器貫通管の管壁の両面に耐食性を付与する
こと等を目的とするものである。The present invention has been made in view of such circumstances, and an object thereof is to impart corrosion resistance to both surfaces of the pipe wall of the container penetrating pipe without disassembling the welded part to which the container penetrating pipe is attached. It is what
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、本発明では、容器壁の配管貫通用穴に挿入状態の容
器貫通管を取り付けている溶接部の周囲に冷却用流体を
介在させた状態と、容器貫通管の内部に気体を介在させ
た状態との環境で、容器貫通管の内面に溶接部の範囲を
越えた状態のクラッド溶接を施して耐食性金属クラッド
層を形成する方法としている。In order to achieve the above object, in the present invention, a cooling fluid is interposed around a welded portion where a container penetrating pipe in an inserted state is attached to a pipe penetrating hole of a container wall. It is a method of forming a corrosion-resistant metal clad layer by performing clad welding on the inner surface of the container penetrating pipe beyond the range of the welded part in an environment where the gas is present inside the container penetrating pipe. ..
【００１０】[0010]
【作用】容器貫通管の内面に耐食性金属クラッド層を形
成する際の熱が、容器貫通管の管壁に及ぶと、外面側が
冷却用流体の雰囲気にあって冷却が促進されることと、
内面側が気体の雰囲気にあって冷却が緩慢となることと
によって、管壁の内外面の間に温度差が生じ、この温度
差に基づく管壁の伸縮による応力値が降伏点を越えて、
管壁に塑性変形が発生する。その後、管壁の温度差が消
滅すると、管壁の外表面に圧縮の残留応力が付与され、
耐食性が向上する。一方、容器貫通管の管壁の内面側に
は、引っ張りの残留応力が生じることになるが、耐食性
金属クラッド層を形成することによって、その管壁の内
面が耐食性金属クラッド層によって覆われ、耐食性の向
上が図られる。When heat generated when the corrosion-resistant metal clad layer is formed on the inner surface of the container penetrating pipe reaches the pipe wall of the container penetrating pipe, cooling is promoted because the outer surface side is in the atmosphere of the cooling fluid.
Due to the fact that the inner surface side is in a gas atmosphere and cooling is slow, a temperature difference occurs between the inner and outer surfaces of the pipe wall, and the stress value due to the expansion and contraction of the pipe wall based on this temperature difference exceeds the yield point,
Plastic deformation occurs on the pipe wall. After that, when the temperature difference of the pipe wall disappears, compressive residual stress is applied to the outer surface of the pipe wall,
Corrosion resistance is improved. On the other hand, on the inner surface side of the tube wall of the container penetration tube, tensile residual stress will occur, but by forming the corrosion-resistant metal clad layer, the inner surface of the tube wall is covered with the corrosion-resistant metal clad layer, Is improved.
【００１１】[0011]
【実施例】図１ないし図６は、本発明に係る容器貫通配
管溶接部の耐食性改善方法を、図７及び図８に示した原
子炉圧力容器における容器壁１の容器貫通管３に適用し
た一実施例を示すものである。1 to 6 show a method of improving corrosion resistance of a welded portion of a container penetrating pipe according to the present invention, which is applied to a container penetrating pipe 3 of a container wall 1 in a reactor pressure container shown in FIGS. 7 and 8. 1 shows an example.
【００１２】以下、補修工程の実施順に説明する。The repair steps will be described below in the order of execution.
【００１３】［既設配管の閉塞工程］図１に示すよう
に、容器壁( 例えばＳＱＶ２Ａ材によって構成される )
１に、配管貫通用穴２を上方に延長するように、容器壁
１の内底部にスタブチューブ４が立設され、該スタブチ
ューブ４における上縁部と容器貫通管( 例えばＳＵＳ３
０４ＴＰ材からなる配管 )３の外周部との間に溶接部５
が形成されて、容器壁１と容器貫通管３とを一体化した
状態となっている場合、容器貫通管３の管穴３ａの中に
閉塞栓７を装着して上下に区画する。この場合、原子炉
圧力容器の内部に、原子炉冷却水を存在させた状態とす
るとともに、閉塞栓７の装着後はその上に冷却用流体と
して水を充満させ、作業員の放射線被曝を低減しながら
作業を行なう（以下の各作業においても同様である）。[Blocking process of existing piping] As shown in FIG. 1, the container wall (for example, made of SQV2A material)
1, a stub tube 4 is erected on the inner bottom portion of the container wall 1 so as to extend the pipe penetrating hole 2 upward, and the upper edge of the stub tube 4 and the container penetrating pipe (for example, SUS3
Piping made of 04TP material) Welded portion 5 between the outer periphery of 3)
When the container wall 1 and the container penetrating pipe 3 are integrated with each other by forming the above, the blocking plug 7 is mounted in the pipe hole 3a of the container penetrating pipe 3 and is divided into upper and lower parts. In this case, the reactor cooling water is made to exist inside the reactor pressure vessel, and after the blocking plug 7 is attached, the cooling water is filled with water as a cooling fluid to reduce the radiation exposure of workers. While doing the work (same for each work below).
【００１４】［気体雰囲気の形成工程］容器貫通管３の
内部については、気体（後述するクラッド形成時にはヘ
リウム等）を介在させた状態の環境とする。[Gas Atmosphere Forming Step] The inside of the container penetrating pipe 3 is set in an environment in which gas (helium or the like) is interposed when forming a clad described later.
【００１５】［クラッド溶接範囲の設定工程］容器貫通
管３の内面に、溶接部５の範囲（図１では２７ｍｍ）を
越えた状態の塗布範囲（図１では上側に２８ｍｍ、下側
に３５ｍｍを加えた範囲）を設定する。[Clad Welding Range Setting Step] On the inner surface of the container penetrating pipe 3, a coating range (28 mm in the upper side in FIG. 1 and 35 mm in the lower side) beyond the range of the welded portion 5 (27 mm in FIG. 1) is applied. Add range) is set.
【００１６】［クラッド溶接材料の塗布工程］上記の設
定範囲に、焼結用金属粉末を塗布する。該焼結用金属粉
末は、例えば、Ｃｒ−Ｎｉ−Ｍｏ−Ｆｅの比が４：４：
０．５：１のものが使用される。[Clad Welding Material Coating Step] Metal powder for sintering is coated in the above-mentioned set range. The metal powder for sintering has, for example, a Cr-Ni-Mo-Fe ratio of 4: 4 :.
A 0.5: 1 ratio is used.
【００１７】［クラッド溶接工程］適宜加熱手段（例え
ばレーザトーチ）を容器貫通管３の内部に挿入し、前述
したヘリウム雰囲気で焼結用金属粉末を塗布した箇所を
加熱して、焼結用金属粉末を溶解するクラッド溶接を施
して耐食性金属クラッド層８を形成する。[Clad welding step] An appropriate heating means (for example, a laser torch) is inserted into the inside of the container penetrating tube 3, and the portion where the sintering metal powder is applied is heated in the above-mentioned helium atmosphere to heat the sintering metal powder. Clad welding is performed to melt the metal to form the corrosion-resistant metal clad layer 8.
【００１８】［クラッド層による閉塞状態］これらの耐
食性金属クラッド層８が形成されると、溶接部５の近傍
における管壁に欠陥部が生じていた場合には、管壁の厚
さ方向の閉塞がなされ、漏洩現象が生じている場合に
は、その漏洩が停止する。また、閉塞の範囲は、溶接部
５よりも広範囲となり、この範囲において、管壁の内面
は、耐食性金属クラッド層８が介在することに基づいて
耐食性が向上し、かつ、下述するように、管壁の外面で
かつ溶接部５の近傍についても、耐食性の改良が期待さ
れる。[Closed State by Cladding Layer] When these corrosion-resistant metal clad layers 8 are formed, if there is a defective portion on the pipe wall in the vicinity of the welded portion 5, the pipe wall is closed in the thickness direction. If a leak has occurred and a leakage phenomenon has occurred, the leakage stops. Further, the range of blockage becomes wider than the welded part 5, and in this range, the corrosion resistance of the inner surface of the pipe wall is improved due to the interposition of the corrosion resistant metal clad layer 8, and as described below, It is expected that the corrosion resistance will be improved also on the outer surface of the pipe wall and in the vicinity of the welded portion 5.
【００１９】［閉塞栓の撤去工程］閉塞栓７は、クラッ
ド層形成後の適宜時期において撤去される。[Step of Removing Closing Plug] The closing plug 7 is removed at an appropriate time after the cladding layer is formed.
【００２０】＜実験例＞図１及び図２に○印で示す箇所
を試験箇所として設定し、かつ、図１に示す寸法及び材
料のモデルについて、前述した［既設配管の閉塞工程］
ないし［閉塞栓の撤去工程］に基づいて、所定厚さ及び
所定入熱のクラッド溶接を行ない、クラッド層形成前後
の残留応力の付与状態を検出した。その結果を図３ない
し図６に示す。なお、これらの図では、容器貫通管の管
壁の位置と残留応力との関係の比較を容易にするため、
溶接部近傍の断面積を併記してある。<Experimental Example> The points marked with a circle in FIGS. 1 and 2 are set as test points, and the model of dimensions and materials shown in FIG.
Based on the [blocking plug removal step], clad welding with a predetermined thickness and a predetermined heat input was performed to detect the state of residual stress application before and after the formation of the clad layer. The results are shown in FIGS. In these figures, in order to facilitate the comparison of the relationship between the position of the tube wall of the container penetration tube and the residual stress,
The cross-sectional area near the weld is also shown.
【００２１】図３及び図４は、溶接部を形成したままの
未処理状態の容器貫通管（以下の図ではハウジングと称
す）における残留応力分布を示す。溶接部近傍における
容器貫通管の管壁内外面の状態を見ると、軸方向内外面
及び周方向内外面の残留応力が、一部＋側となる引張り
の残留応力が付与されている。特に、軸方向の残留応力
は、図８の欠陥部の発生原因となるものである。なお、
０度及び１８０度の相違は、データのばらつきを検知す
るためのものである。FIGS. 3 and 4 show residual stress distributions in an untreated container penetrating pipe (referred to as a housing in the following drawings) with a welded portion formed. Looking at the state of the inner and outer surfaces of the pipe wall of the container penetrating pipe in the vicinity of the welded portion, the residual stress on the inner and outer surfaces in the axial direction and the inner and outer surfaces in the circumferential direction is partially given a tensile residual stress which is the positive side. In particular, the residual stress in the axial direction causes the defects shown in FIG. In addition,
The difference between 0 degree and 180 degrees is for detecting the variation in data.
【００２２】図５及び図６は、前述のクラッド層を形成
した後の容器貫通管における残留応力分布を示す。溶接
部近傍における容器貫通管の管壁外面の状態を見ると、
軸方向及び周方向ともにその残留応力が−側、つまり、
圧縮の残留応力が付与されている。そして、管壁内面の
状態は、軸方向及び周方向ともにその残留応力が＋側の
引張り残留応力となっているが、その大部分が耐食性金
属クラッド層に覆われた状態となっている。FIGS. 5 and 6 show residual stress distribution in the container through-pipe after the above-mentioned clad layer is formed. Looking at the state of the outer surface of the pipe wall of the container penetration pipe near the weld,
The residual stress is negative in both the axial and circumferential directions, that is,
A compressive residual stress is applied. In the state of the inner surface of the pipe wall, the residual stress in both the axial direction and the circumferential direction is the tensile residual stress on the + side, but most of the residual stress is covered with the corrosion-resistant metal clad layer.
【００２３】したがって、容器貫通管にあっては、容器
壁やスタブチューブ等の機械的強度の優れた部分への取
り付け部分である溶接部の近傍では、管壁の外面側が圧
縮の残留応力、そして、管壁の内面側が耐食性金属クラ
ッド層に覆われた状態となって、それぞれ耐食性が向上
するものとなっている。Therefore, in the case of the container penetrating pipe, in the vicinity of the welded part which is a part to be attached to the container wall or a part having excellent mechanical strength such as a stub tube, the outer surface side of the pipe wall has residual compressive stress, and The inner surface of the pipe wall is covered with the corrosion-resistant metal clad layer to improve the corrosion resistance.
【００２４】＜他の実施態様＞本発明にあっては、以上
説明した実施例に代えて、次の構成を採用することがで
きる。 （イ）原子炉圧力容器以外の容器貫通配管の補修に適用
すること。 （ロ）配管の回りに溶接によってフランジを取り付けて
いる部分の補修に適用すること。<Other Embodiments> In the present invention, the following constitution can be adopted instead of the above-described embodiments. (A) Applicable for repair of vessel penetration pipes other than reactor pressure vessels. (B) Applicable to the repair of the part where the flange is attached by welding around the pipe.
【００２５】[0025]
【発明の効果】本発明に係る容器貫通配管溶接部の耐食
性改善方法によれば、溶接部の周囲に冷却用流体を介在
させた状態で、溶接部の形成範囲を越えて、容器貫通管
の内面に耐食性クラッド層を形成するものであるから、
以下のような効果を奏する。 （１） クラッド層形成時の熱が管壁に及んで内外の温
度差が生じることに基づいて、管壁の外面に圧縮残留応
力が付与されて、水等の腐食因子が存在する場合にあっ
ても、応力腐食割れ等の発生を効果的に防止することが
できる。 （２） 容器貫通管の内面に耐食性クラッド層を形成す
ることによって、管壁内面に耐食性を付与することがで
きるとともに、クラッド層の形成範囲に欠陥部が発生し
ている場合やその恐れのある場合に、クラッド層によっ
て管壁の内外の密閉化を図ることができる。EFFECTS OF THE INVENTION According to the method for improving the corrosion resistance of a welded portion of a container penetrating pipe according to the present invention, in a state where a cooling fluid is interposed around the welded portion, the container penetrating pipe of the container penetrating pipe is exceeded beyond the range where the welded portion is formed. Since the corrosion resistant clad layer is formed on the inner surface,
The following effects are achieved. (1) There is a case where a compressive residual stress is applied to the outer surface of the pipe wall due to heat generated during the formation of the clad layer, which causes a temperature difference between the inside and the outside, and a corrosion factor such as water exists. However, it is possible to effectively prevent the occurrence of stress corrosion cracking and the like. (2) By forming a corrosion-resistant clad layer on the inner surface of the container penetrating pipe, it is possible to impart corrosion resistance to the inner surface of the pipe wall, and there is or may be a case where a defect occurs in the cladding layer formation range. In this case, the inside and outside of the pipe wall can be sealed by the clad layer.
【図１】本発明に係る容器貫通配管溶接部の耐食性改善
方法を原子炉圧力容器の容器貫通管に適用した一実施例
を示す正断面図である。FIG. 1 is a front sectional view showing an embodiment in which a method for improving corrosion resistance of a welded portion of a vessel penetrating pipe according to the present invention is applied to a vessel penetrating pipe of a reactor pressure vessel.
【図２】図１のＢ−Ｂ線矢視図である。FIG. 2 is a view taken along the line BB of FIG.
【図３】溶接部を形成したままの未処理状態の容器貫通
管における残留応力分布と溶接部近傍の位置関係とを併
記した状態の図２の０度位置における残留応力分布図で
ある。FIG. 3 is a residual stress distribution diagram at the 0 ° position in FIG. 2 in which the residual stress distribution in the unprocessed container through-pipe with the welded portion formed and the positional relationship near the welded portion are also shown.
【図４】溶接部を形成したままの未処理状態の容器貫通
管における残留応力分布と溶接部近傍の位置関係とを併
記した状態の図２の１８０度位置における残留応力分布
図である。FIG. 4 is a residual stress distribution diagram at the 180-degree position in FIG. 2 in which the residual stress distribution in the unprocessed container through-pipe with the welded part formed and the positional relationship in the vicinity of the welded part are also shown.
【図５】クラッド層形成後の容器貫通管における残留応
力分布と溶接部近傍の位置関係とを併記した状態の図２
の０度位置における残留応力分布図である。FIG. 5 is a view showing a state in which the residual stress distribution and the positional relationship in the vicinity of the welded portion in the container penetrating pipe after formation of the clad layer are shown together.
5 is a residual stress distribution diagram at the 0 degree position of FIG.
【図６】クラッド層形成後の容器貫通管における残留応
力分布と溶接部近傍の位置関係とを併記した状態の図２
の１８０度位置における残留応力分布図である。FIG. 6 is a diagram showing a state in which the residual stress distribution in the container through-pipe after formation of the cladding layer and the positional relationship in the vicinity of the welded portion are shown together.
FIG. 4 is a residual stress distribution map at the 180-degree position of FIG.
【図７】沸騰水型原子炉における下鏡部を貫通する配管
の例を示す正断面図である。FIG. 7 is a front cross-sectional view showing an example of piping penetrating a lower mirror portion in a boiling water reactor.
【図８】容器貫通管の溶接部近傍における欠陥部の説明
図である。FIG. 8 is an explanatory diagram of a defective portion in the vicinity of a welded portion of a container through pipe.
１ 容器壁( 容器下鏡部 ) ２ 配管貫通用穴 ３ 容器貫通管( 配管 ) ３ａ 管穴 ４ スタブチューブ ５ 溶接部 ６ 下鏡アニュラス部 ７ 閉塞栓 ８ 耐食性金属クラッド層 Ｘ 欠陥部 1 Container Wall (Container Lower Mirror) 2 Piping Penetration Hole 3 Container Penetrating Pipe (Piping) 3a Pipe Hole 4 Stub Tube 5 Weld 6 Lower Mirror Annulus 7 Closure 8 Corrosion Resistant Metal Clad Layer X Defect
Claims (1)
貫通管を取り付けている溶接部の周囲に冷却用流体を介
在させた状態とする工程と、容器貫通管の内部に気体を
介在させた状態で容器貫通管の内面に溶接部の範囲を越
えた状態のクラッド溶接を施して耐食性金属クラッド層
を形成する工程とを有することを特徴とする容器貫通配
管溶接部の耐食性改善方法。1. A process of interposing a cooling fluid around a welded portion where a container penetrating pipe is inserted in a pipe penetrating hole of a container wall, and a gas interposing inside the container penetrating pipe. And a step of forming a corrosion-resistant metal clad layer by performing clad welding on the inner surface of the container penetrating pipe in a state of exceeding the range of the welded part in this state, and improving the corrosion resistance of the container penetrating pipe welding part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3040317A JPH0592281A (en) | 1991-03-06 | 1991-03-06 | Corrosion resistance improvement method for welded parts through container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3040317A JPH0592281A (en) | 1991-03-06 | 1991-03-06 | Corrosion resistance improvement method for welded parts through container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0592281A true JPH0592281A (en) | 1993-04-16 |
Family
ID=12577237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3040317A Withdrawn JPH0592281A (en) | 1991-03-06 | 1991-03-06 | Corrosion resistance improvement method for welded parts through container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0592281A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014220845A1 (en) | 2013-10-15 | 2015-04-16 | Honda Motor Co., Ltd. | exhaust gas purifying filter |
| DE102014221169A1 (en) | 2013-10-21 | 2015-05-07 | Honda Motor Co., Ltd. | exhaust gas purifying filter |
| DE102014220879A1 (en) | 2013-10-15 | 2015-07-23 | Honda Motor Co., Ltd. | exhaust gas purifying filter |
-
1991
- 1991-03-06 JP JP3040317A patent/JPH0592281A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014220845A1 (en) | 2013-10-15 | 2015-04-16 | Honda Motor Co., Ltd. | exhaust gas purifying filter |
| DE102014220879A1 (en) | 2013-10-15 | 2015-07-23 | Honda Motor Co., Ltd. | exhaust gas purifying filter |
| DE102014221169A1 (en) | 2013-10-21 | 2015-05-07 | Honda Motor Co., Ltd. | exhaust gas purifying filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980514 |