Welding Al-Zn-Mg (7xxx Series) Alloys - A Literature Review
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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The use of high strength aluminium alloys, especially the alloys of the 7xxx series, in the construction of light armoured vehicles, light weight bridging, and other equipment, is of interest to the designers of military equipment. However, in the use of alloys which exhibit the highest mechanical properties and provide superior ballistic protection a major problem has been exposed. Stress corrosion cracking has been found to occur in both the parent plate and the welded joint. In this review an attempt is made to provide a basis for the understanding of the physical metallurgy and stress corrosion cracking behaviour of the alloys in the 7xxx series. In particular the interrelation between microstructure, environment, and stress state is examined. Recent alloys have been improved by a better understanding of the effects of materials processing operations on the microstructure and residual stress state, Advances in welding techniques offer an opportunity to substantially reduce the residual stress level associated with welding thick sections. The technique of pulsed current metal inert gas synergic welding holds considerable promise.
- Properties of Metals and Alloys
- Fabrication Metallurgy