Microstructure and Mechanical Properties of AL-DGFVE232B Alloy under Artificial Aging Conditions after MIG Welding

The AL-DGFVE232B-T6 alloy, a high-strength 7000-series aluminum alloy, is widely used in lightweight structural applications due to its low density and excellent mechanical properties. However, Gas Metal Arc (GMA) welding can degrade its mechanical performance and soften the microstructure, particularly in the heat-affected zone (HAZ), making post-weld heat treatment necessary. In this study, 8 mm-thick AL-DGFVE232B-T6 plates were GMA welded using X- and Y-groove configurations, followed by four artificial aging treatments and one natural aging condition. Tensile strength, hardness, and microstructure were evaluated to assess the effect of each condition. The results demonstrated that the mechanical properties and microstructural features varied with heat treatment, and a post-weld heat treatment condition showing relatively improved property recovery was identified within the investigated range.