Damage analysis of dissimilar metal welds of power equipment

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Damage analysis of dissimilar metal welds of power equipment

Popis výsledku v původním jazyce

Heterogeneous dissimilar welds (DMW) are always problematic and critical areas of pressure vessels and piping. A critical structural area is created by combining two materials with different chemical composition and with completely different mechanical and physical properties, especially different thermal expansion. This critical detail very often undergoes intensive degradation during operation and very often, the operational degradation of the junction of the two materials with different properties ends with the loss of integrity of the pressure boundary. There are three main factors leading to failures - higher operation temperature than design parameters, inappropriate design of a heterogeneous welded joint to areas with higher stress levels and poor erection quality, where defects are already in the welded joint from assembly. The cause of the failures is also other factors that are not known at the design stage of the pressure units or are not sufficiently evaluated. Susceptibility to stress corrosion cracking (SCC) of one of the used DMW materials during long time operation is one such unknown factor in the design stage. Stress corrosion cracking is the growth of crack formation in a corrosive environment. It can lead to unexpected sudden failure of normally ductile metals subjected to a tensile stress. The stresses can resulted from the crevice loads due to stress concentration, or can be caused by the type of assembly or residual stresses from fabrication.

Název v anglickém jazyce

Damage analysis of dissimilar metal welds of power equipment

Popis výsledku anglicky

Heterogeneous dissimilar welds (DMW) are always problematic and critical areas of pressure vessels and piping. A critical structural area is created by combining two materials with different chemical composition and with completely different mechanical and physical properties, especially different thermal expansion. This critical detail very often undergoes intensive degradation during operation and very often, the operational degradation of the junction of the two materials with different properties ends with the loss of integrity of the pressure boundary. There are three main factors leading to failures - higher operation temperature than design parameters, inappropriate design of a heterogeneous welded joint to areas with higher stress levels and poor erection quality, where defects are already in the welded joint from assembly. The cause of the failures is also other factors that are not known at the design stage of the pressure units or are not sufficiently evaluated. Susceptibility to stress corrosion cracking (SCC) of one of the used DMW materials during long time operation is one such unknown factor in the design stage. Stress corrosion cracking is the growth of crack formation in a corrosive environment. It can lead to unexpected sudden failure of normally ductile metals subjected to a tensile stress. The stresses can resulted from the crevice loads due to stress concentration, or can be caused by the type of assembly or residual stresses from fabrication.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

EAN 2019 57th conference on experimental stress analysis CONFERENCE PROCEEDINGS

ISBN

9788021457669

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

179-183

Název nakladatele

Česká společnost pro mechaniku

Místo vydání

Praha

Místo konání akce

Luhačovice

Datum konání akce

3. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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