JPS6178575A - Preventions method of brittle fracture - Google Patents
Preventions method of brittle fractureInfo
- Publication number
- JPS6178575A JPS6178575A JP59199387A JP19938784A JPS6178575A JP S6178575 A JPS6178575 A JP S6178575A JP 59199387 A JP59199387 A JP 59199387A JP 19938784 A JP19938784 A JP 19938784A JP S6178575 A JPS6178575 A JP S6178575A
- Authority
- JP
- Japan
- Prior art keywords
- annular material
- nozzle
- annular
- crack
- welding
- 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
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/12—Vessels
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Pressure Vessels And Lids Thereof (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は大型圧力容器のノズル溶接部、局所的に亀裂発
生の確率の高いことが明らかである部位で且つ適当な補
強法がない板状構造物等における粘性破壊防止方法に係
るものである。Detailed Description of the Invention (Field of Industrial Application) The present invention is applied to nozzle welds of large pressure vessels, which are plate-shaped parts where it is clear that there is a high probability of locally cracking, and where there is no suitable reinforcement method. This relates to a method for preventing viscous destruction in structures, etc.
（従来の技術）及び（問題点を解決するための手段）従
来圧力容器に対するノズルの取付は溶接部よって行なわ
れている。また特に信頼性の要求される容器のノズルは
補強板を重ねて溶接されている。(Prior Art) and (Means for Solving the Problems) Conventionally, a nozzle is attached to a pressure vessel by welding. In addition, the nozzle of the container, which particularly requires reliability, is welded with reinforcing plates stacked on top of each other.
市記した圧力容器のノズル溶接部またはノズル補強［溶
接部は溶接残留応力や形状的不連続のため、溶接時やま
た使用中においても内圧による応力集中のため、亀裂を
発生し易い。そしてこの亀裂発生部を起点として発生し
た脆性亀裂は容器の端部にまで伝播して大事故となる。Nozzle welded parts or nozzle reinforcement of pressure vessels [Welded parts are prone to cracking due to welding residual stress and geometric discontinuity, and stress concentration due to internal pressure during welding and during use. The brittle cracks that originate from this crack initiation point propagate to the edges of the container, causing a major accident.
従来脆性破壊を生起した圧力容器の調査より、ノズルの
溶接部が最も危険であり、強度上の急所となっている。Investigations of pressure vessels that have conventionally caused brittle fracture have shown that the nozzle weld is the most dangerous and critical point in terms of strength.
このように危険位置が判っているのにもかかわらず、未
だ脆性亀裂発生に対する適切な防止策が施されていない
のが実情である。Despite the knowledge of such dangerous locations, the reality is that no appropriate measures have been taken to prevent the occurrence of brittle cracks.
（問題点な解決するための手段）
本発明はこのような問題点を解決するため忙提案された
ものであって、魔性亀裂が発生する危険のある部位を囲
繞するよりに高靭性円環材を母材に溶接し、同円環材に
よって亀裂の円環材外方への伝播を阻止することを特徴
とする脆性破壊防止方法に係るものである。(Means for Solving Problems) The present invention has been proposed in order to solve these problems, and it uses a highly tough annular material to surround areas where there is a risk of occurrence of magic cracks. This relates to a brittle fracture prevention method characterized by welding a base material to a base metal and using the annular material to prevent cracks from propagating outward from the annular material.
（作用）及び（発明の効果）
本発明においては前記したよう釦、脆性亀裂が発生する
危険のおる部位を囲繞するよりに、高靭性用環材が母材
に溶接されているので、母材における同円環材部分の肉
厚が増大されるととも圧用環材の有する高靭性によって
１円環材内部において母材に発生する亀裂の円環材外方
への伝播が阻止され、この結果、脆性亀裂の伝播が局部
的に限定阻止され、母材全体の破壊が防止されるもので
ある。(Function) and (Effects of the Invention) In the present invention, the high-toughness ring material is welded to the base metal, rather than surrounding the button or the area where there is a risk of brittle cracks as described above. As the wall thickness of the same circular ring material is increased, the high toughness of the pressing ring material prevents cracks that occur in the base material inside the circular ring material from propagating outward from the circular ring material. , the propagation of brittle cracks is locally limited and prevented, and destruction of the entire base material is prevented.
なお円環材の材質な適当に選定することによって、疲労
亀裂や応力腐蝕割れの伝播阻止効果が発揮されるもので
ある。By appropriately selecting the material of the annular member, the effect of inhibiting the propagation of fatigue cracks and stress corrosion cracks can be exhibited.
（実施例）
以下本発明な圧力容器のノズル溶接部に適用したｍ示の
実施列について説明する。(Example) Examples of embodiments applied to a nozzle welded portion of a pressure vessel according to the present invention will be described below.
（１）は炭素ｆ＊５Ｂ４６より構成された圧力容器本体
、（２）はノズルで圧力容器本体＋ＩＮＫ溶接されるか
、ノズル（２）が溶接されたノズル補強板（３）が圧力
容器本体（１）に溶接される。(1) is a pressure vessel body made of carbon f*5B46, (2) is a nozzle that is welded to the pressure vessel body + INK, or a nozzle reinforcement plate (3) to which the nozzle (2) is welded is a pressure vessel body ( 1) to be welded.
図中（４）はノズル（２）の圧力容器本体（ｌｌまたは
ノズル補強板（３）に対するノズル溶接ビード、（５）
はノズル補強板（３）の圧力容器本体（１）に対するノ
ズル補強板溶接ビードである。In the figure, (4) is the nozzle weld bead of the nozzle (2) to the pressure vessel body (ll or nozzle reinforcing plate (3), (5)
is a nozzle reinforcement plate weld bead of the nozzle reinforcement plate (3) to the pressure vessel body (1).
而して前記溶接ビーに＋４１（５）部を囲繞して２％Ｎ
！鋼、３３ＡＮｊ鋼よりなる高靭性円環材（６）を前記
圧力容器本体（１）の外周胴板に溶接する。図中（力は
円環材溶接ビードである。Then, surrounding the +41 (5) part of the welding bead and applying 2% N
! A high-toughness annular member (6) made of 33ANj steel is welded to the outer peripheral shell plate of the pressure vessel main body (1). In the figure (the force is the welding bead of the annular material.
前記実施例によれば圧力容器本体（１）における円環材
（６）取付部分が厚肉化されるとともに、同円環材（６
）の有する高靭性によって１円環材（６）内に生起した
亀裂（８）の円環材（６）の外方への伝播が同円環材（
６）によって阻止される。According to the embodiment, the mounting portion of the annular member (6) in the pressure vessel main body (1) is thickened, and the annular member (6)
) Due to the high toughness of the annular material (6), the crack (8) generated in the annular material (6) is prevented from propagating outward of the annular material (6).
6) is prevented.
この結果、脆性亀裂の伝播がノズル（２）周囲だけで阻
止され、全体破壊が予防される。As a result, propagation of brittle cracks is prevented only around the nozzle (2), and total destruction is prevented.
なお前記円環材（６）の材質として、圧力容器本体（１
）の母材より熱膨張係数が大で、且つ高靭性のオーステ
ナイト系スデンレス鋼？選定した場合、溶接後、或いは
焼鈍後の残留応力は円環材（６）下部の圧力容器本体（
１）の胴板で円周方向に圧縮となり、円環材（６）部分
の厚肉化、円環材（６）の高靭性によって、円環材（６
）内の亀裂（８）が円環材（６）外方に伝播するのを阻
止される。The material of the annular member (6) may be the pressure vessel main body (1).
) is an austenitic stainless steel with a higher coefficient of thermal expansion and higher toughness than the base metal? If selected, the residual stress after welding or annealing will be absorbed by the pressure vessel body (
The body plate of 1) is compressed in the circumferential direction, and due to the thickening of the annular material (6) and the high toughness of the annular material (6), the annular material (6) is compressed.
) are prevented from propagating outward of the torus (6).
またこの場合、疲労亀裂や応力腐蝕割れの伝播に対して
もその阻止効果が発揮される。In this case, the effect of inhibiting the propagation of fatigue cracks and stress corrosion cracks is also exhibited.
第１図は本発明の方法が適用された圧力容器の斜面図、
第２（２）及び第３図は夫々そのノズル並にノズル補強
板溶接部の縦断面図である。
（１）・・・圧力容器本体、（２）・・・ノズル、（３
）・・・ノズル補強板、（／Ｉ）（５）・・・溶接ビー
）’、 （６）・・・円環材、（力・・・円環材ｌＩ；
接ビービ
復代狸人 片狸十 岡 本 重 文
外６名FIG. 1 is a perspective view of a pressure vessel to which the method of the present invention is applied;
2(2) and 3 are longitudinal sectional views of the nozzle and the welded portion of the nozzle reinforcing plate, respectively. (1)... Pressure vessel body, (2)... Nozzle, (3
)... Nozzle reinforcement plate, (/I) (5)... Welding bead)', (6)... Circular material, (Force... Circular material lI;
Contact Beebi Fudai Tanukito Kata Tanuki Ju Okamoto Shige Bungai 6 people
Claims (1)
靭性円環材を母材に溶接し、同円環材によつて亀裂の円
環材外方への伝播を阻止することを特徴とする脆性破壊
防止方法。It is characterized by welding a high-toughness annular material to the base material rather than surrounding the area where there is a risk of brittle cracks occurring, and using the annular material to prevent cracks from propagating outward from the annular material. A method to prevent brittle fracture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59199387A JPS6178575A (en) | 1984-09-26 | 1984-09-26 | Preventions method of brittle fracture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59199387A JPS6178575A (en) | 1984-09-26 | 1984-09-26 | Preventions method of brittle fracture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6178575A true JPS6178575A (en) | 1986-04-22 |
Family
ID=16406921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59199387A Pending JPS6178575A (en) | 1984-09-26 | 1984-09-26 | Preventions method of brittle fracture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6178575A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021061678A (en) * | 2019-10-07 | 2021-04-15 | 三菱電機株式会社 | Pressure vessel, and gas-insulated switch gear using the same |
-
1984
- 1984-09-26 JP JP59199387A patent/JPS6178575A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021061678A (en) * | 2019-10-07 | 2021-04-15 | 三菱電機株式会社 | Pressure vessel, and gas-insulated switch gear using the same |
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