A New Strategy for Preparing Advanced Aluminum/Steel Joint Using Low‐Temperature Explosive Welding Technology

Abstract

Obtaining a high‐quality Al/Fe joint remains a challenging task, due to formation of the various defects associated with melting phenomenon. Herein, a new strategy, lowering of initial temperature of the welded plates, is proposed to suppress the undesirable melting zone. Contrast experiments are conducted at low temperature (−50 °C) and room temperature (25 °C), respectively, and the microstructures and mechanical properties of the achieved joints are carefully investigated. It is found that this strategy is an effective way to improve the quality of Al/Fe joint, where the melting‐related defects are significantly reduced, and the bonding strength is increased by 18% when compared to the traditional method. In addition, the lowering of initial temperature enables to preserve the original properties of the parent metals by mitigating the impact‐induced grain structure evolution. This phenomenon is first demonstrated in this work and can be employed as a processing strategy to develop an advanced Al/Fe joint.