Abstract:To further reduce the explosive thickness and to improve the bonding quality of titanium/steel composite plates, explosive welding experiments of TA1/Q235 were conducted using a low detonation velocity explosive (53#) under the guidance of the explosive welding lower limit principle with the flyer plate thicknesses of 1, 2, and 4 mm and gaps of 3, 6, and 8 mm. The weldability window for titanium/steel explosive welding was calculated, and a quantitative relationship between dynamic and static process parameters was developed. A β-Vp high-speed inclined collision model was proposed, and two-dimensional numerical simulations for the explosive welding tests were performed using the smoothed particle hydrodynamics (SPH) algorithm, revealing the growth evolution mechanisms of the typical waveform morphology characteristics. Through microstructural characterization techniques, such as optical microscope, scanning electron microscope, energy dispersive spectrometer, and electron backscattered diffractometer, and mechanical property tests in terms of shear strength, bending performance, and impact toughness, the microstructure and mechanical properties of the interfaces of explosively welded TA1/Q235 composite plates were investigated. Results show that the quality of interface bonding is excellent, presenting typical waveform morphology with an average interface shear strength above 330 MPa and an average impact toughness exceeding 81 J. All samples can be bent to 180° without significant delamination or cracking defects.