The fatigue performance of marine grade aluminium alloys has become a limiting factor for design, especially with regard to severe service conditions. An in-depth evaluation of the fatigue performance of two marine grade aluminium alloys (AA5083 and AA5383) has begun, in which optimisation of welding procedures, post-weld treatments and an understanding of how weld metallurgy relates to the fatigue performance are the major goals. The results show that the heat-affected zone (HAZ) hardness of AA5383 welded joints is slightly higher than that of AA5456 welded joints. The fatigue strength of AA5383 welded joints is slightly higher than that of AA5456 welded joints when tested with the reinforcement intact. However, there appears to be little difference when tested in the dressed condition. Welded fatigue samples tested at high stresses displayed multiple crack-initiation sites which linked together to form a single linear crack travelling through the HAZ. Welded fatigue samples tested at low stresses usually had a single crack-initiation site from which a fatigue crack grew in a radial manner. AA5383 and AA5456 welded samples tested with the reinforcement dressed off showed similar fatigue strengths because failure occurred in the weld metal. The information produced in this study will allow ship designers and builders to take full advantage of the latest developments in marine grade aluminium alloys.
The development of the welding procedures and fatigue of butt-welded structures of aluminium-AA5383
1999
6 Seiten, 7 Bilder, 2 Tabellen, 4 Quellen
Conference paper
English
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