Impact Welding Structural Aluminium Alloys to High Strength Steels Using Vaporizing Foil Actuator

摘要

Dissimilar Al/Fe joining was achieved using vaporizing foil actuator welding. Flyervelocities up to 727 m/s were reached using 10 kJ input energy. Four Al/Fe combinationsinvolving AA5052, AA6111-T4, JAC980, and JSC1500 were examined. Weld samples weremechanically tested in lap-shear in three conditions: as-welded, corrosion-tested with ecoating,and corrosion-tested without coating. In all three conditions, the majority of thesamples failed in the base aluminium instead of the weld. This shows that the weld wasstronger than at least one of the base materials, both before and after corrosion testing.Galvanic corrosion was not significant since the differences in open cell potential, whichrepresent the driving forces for galvanic corrosion, were small among these materials—nomore than 60 mV in all cases. Nonetheless, through corrosion testing, the base materialssuffered general corrosion, which accounted for the weakening of the base materials.