Investigation of Crack Control Mechanisms for Intermetallic Compounds at the Interface of Aluminum/Steel During Explosive Welding
摘要
During the production of aluminum/steel explosive welding clad plates, intermetallic compounds and cracks are prone to form at the interface, which can affect the welding quality of the clad plates. To minimize the formation of intermetallic compounds, this paper selects multiple sets of welding parameters (collision angle β, collision velocity Vp) to conduct explosive welding experiments. The welding interface is analyzed, and the following conclusions are obtained: due to the large density difference, the pressure at the collision point is not sufficient to generate a continuous jet of steel, and the interface does not form a regular ripple morphology; due to the influence of aluminum, the interfacial shear strength is basically the same; under the experimental conditions, when the welding parameter was set to β ≤ 19.5° and Vp ≤ 864 m/s, no intermetallic compound cracks appeared at the interface, and the welding quality was excellent. The smoothed particle hydrodynamics method was used to simulate the explosive welding process of aluminum/steel, and the results are as follows: the jet flow in the welding process mainly comes from aluminum, which reaches a fluid state with zero stress at the contact interface. Steel does not produce continuous jet flow, which validates the experimental results.