Experimental data of induced expulsion assisted resistance spot welding of dissimilar metals of aluminum and steel

The data presented herein corresponds to the original experimental results, including metallographic images and mechanical properties, that the author intends to submit to the journal International Journal of Machine Tools and Manufacture. The proposed title for the submission is "Insight into the Joint Forming Process of Cast Aluminum to Press-Hardening Steel Welding by Active-Expulsion Assisted Resistance Spot Welding (AERSW)." The data package specifically comprises optical microscopy images, electron scanning microscopy (ESM) images, inverse pole figure (IPF) maps, elemental scanning results, and mechanical property test outcomes.