Medium strength Al-Zn-Mg aluminium alloy is extensively used in propellant tanks of satellite launch vehicles. The cylindrical tanks are fabricated by TIG welding of sheets and rings into larger diameter pressure vessels. End domes are fabricated by welding petals, and nozzle openings are provided by shrink fit nozzles, welded to the petals. A crack, partly on the overlap region was noticed on one such nozzle weld. A detailed analysis revealed that the crack initiated from the root of pits, propagated under the high longitudinal restraint at the weld stop area, through solute enriched dendrites at the weld fusion line, resulting in an intergranular mode of failure. This is typical of stress corrosion cracking (SCC).
Metallurgical analysis of cracking in weldment of propellant tank
Metallographische Rissanalyse in Schweißverbindungen von einem Treibstofftank
Engineering Failure Analysis ; 10 , 3 ; 265-273
2003
9 Seiten, 9 Bilder, 1 Tabelle, 6 Quellen
Article (Journal)
English
Druckbehälter , Tank , Aluminiumzinkmagnesiumlegierung , Schweißverbindung , Wolfram-Inertgasschweißen , Spannungsrisskorrosion , Risseinleitung , Rissausbreitung , Werkstoffgefüge , interkristalliner Riss , dendritisches Gefüge , Metallographieverfahren , Lochfraßkorrosion , intermetallische Verbindung , Schaden , Schadenursachenforschung , Kraftstofftank
Metallurgical and mechanical features of API 5L X65 pipeline steel weldment
Tema Archive | 2002
|Propellant tank manufacturing controls
AIAA | 1986
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