Experimental Study and Numerical Simulation of Explosive Welding of Nickel Foil with Q235 Steel

In order to study the interface microstructure and formation mechanism of nickel (Ni) foil/steel Q235 (Ni/Q235) explosive composite plate, Ni/Q235 laminated composite was successfully prepared by explosive welding technology using Ni foil, Q235 steel plate as substrate and composite plate. respectively. The microstructure of the bonding interface was analyzed by SEM and EDS. The mechanical properties of the interface were tested by tensile tests. The explosive welding process was simulated by the smooth particle fluid dynamics (Smoothed Particle Hydrodynamics, SPH) numerical simulation method. The results showed that the interface of the Ni/Q235 explosive composite plate had regular wave-like bonding, and there were no defects, such as unbonding and local melting at the bonding interface. The tensile strength of the tensile specimen reached 623 MPa, and the Ni layer and the Q235 layer on either side of the tensile specimen fracture exhibited a mainly plastic fracture. The numerical simulation results were in good agreement with the experimental results, which can provide theoretical support for the study of the explosive welding preparation of Ni/Q235 double-layer composite plate and the bonding mechanism of its connection interface.