The results of imaging experiments for the interfacial regions of four representative solid material joint, composite, and bonds, using a transmission‐type scanning acoustic microscope operating at 150 MHz, are reported. These are (1) Mylar‐epoxy‐Mylar joint, (2) brass‐copper grid‐adhesive‐brass composite, (3) brass‐solder‐brass bond, and (4) silicon‐solder‐copper bond. Flaws, voids, and defects in these specimens have been detected.