Abstract:In order to improve the mechanical properties of Al-Fe transition joints manufactured by explosive welding, meshing bonding interfaces were obtained by prefabricating dovetail grooves in base plates. The microstructure and mechanical properties of the meshing interfaces were systematically investigated. The microstructure observation showed that metallurgical bonding without pores was created in the form of direct bonding and melting zone bonding at the interface. Fractography on tensile specimens showed cleavage fracture on the steel side and ductile fracture on the aluminum side near the interfaces. The tensile shear test results indicated that the shear strength of the meshing interface 0° and 90° was increased by 11% and 14%, respectively, when being compared to that of the ordinary Al-Fe transition joints. The values of microhardness decreased as the distance from the interface increased. After three-point bending, cracks were observed at the bonding interface for some specimens due to the existence of brittle Fe-Al compounds.

Key words: explosive welding; meshing interface; aluminum; stainless steel