1424 alloy (p = 2.54 g/cm3) is an improved modification of the 1420 alloy as a result of additional alloying with zinc and scandium with a small decrease of the lithium and magnesium content. 1424 alloy differs from the 1420 alloy by higher characteristics of static strength, fracture toughness, low-cycle fatigue, weldability, and is also characterized by the superplasticity effect. In this study, investigations were carried out in three methods of producing welded joints in sheets of 1424 alloy by automatic argon-shielded arc welding: as-received condition + welding + overquenching + artificial ageing; overquenching + artificial ageing + welding; overquenching + welding + artificial ageing. The results may be summarised as follows: 1424 alloy can be efficiently welded by various welding methods (argon-shielded arc welding, laser, electron beam, FSW). The strength of the welded joints equals from 0.75 to 0.98 of the strength of the parent material at a high plasticity level. Additional heat treatment in the conditions (quenching + artificial ageing) of the welded joint produced by argon-shielded arc welding increases the strength of the welded joints to 0.95 of the strength of the parent metal. Butt and T-welded joints have high corrosion resistance in tests for CC, GC, ICC and EC. Quenching in air which is compulsory for sheets of 1424 alloy makes it possible to combine the process of shaping of the welded joints with quenching and eliminates at the same time welding strains and stresses.
Advanced aluminium-lithium 1420 alloy for welded structures for aerospace technology
Welding International ; 24 , 10 ; 783-786
2010
4 Seiten, 4 Bilder, 4 Tabellen, 4 Quellen
Article (Journal)
English
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