The behavior of stress corrosion cracking (SCC) of an overaged Al-3.7wt%Zn-2.5wt%Mg alloy including base metal, weldment, and heat-affected zone (HAZ) in 3.5% NaCI solution was investigated. This Al-Zn-Mg alloy loaded in longitudinal or long transverse direction has good SCC resistance and is maintained even after welding. Welding residual stress alone does not induce the SCC of the weldment. The result of the specially modified type I double cantilever beam (DCB) testing shows that the crack can be arrested by the weld metal because of the better SCC resistance of the filler metal ER5183. In addition, a specially designed type II DCB testing indicates that the SCC resistance of the HAZ is better than that of the base metal because of the re-overaging of the HAZ during welding.

Subject
Test methods, Precipitates, Welding, Stress cracking, Base metals, U bends, Aluminum alloys, Grain boundary, Alloys, Weld metal, Stress corrosion cracking, Residual stress, Weldment
Keywords:
heat-affected zone, precipitates, stress corrosion cracking, weld
NACE International
1993
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