Bruchmechanische Untersuchungen an einer Schweißverbindung von 90 mm Dicke aus Almg 4,5 Mn bei Raumtemperatur und bei −196 °C

Abstract

To asses the toughness of a 90 mm thick MIG-weld joint of A1 Mg4.5 Mn fracture mechanics and charpy impact material parameters have been determined at 20 "C and -196 "C. Additional to the mechanical tests extensive metallographic and fractographic tests on specimens of the weld material and base material were done. The results of the fracture mechanics tests and the fracture analysis show, that now brittle fracture will occur at -196 "C. The further conclusions are, that charpy energy values are no meaningful basis for a toughness evaluation of such an aluminium weld joint. The joint can be used without restrictions at -196 "C.