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An explosive welding experiment with small inclination was performed for researching the influence of explosive welding parameters on the interfacial waves. The interfacial waves of continuous change were obtained under the different impact velocities and impact angles. Through observing the OM morphology of interfacial waves, the wave length and wave height were measured. Explosive welding with small inclination was numerically simulated using SPH method, and the parameters such as impact velocity, impact angle and specific pressure were calculated. The results show that the impact velocity and the impact angle are the key parameters affecting interfacial waves. When the impact velocity is 493 m/s and impact angle is 9.8o, the interfacial waves begin to form. The wave length increases with higher impact velocity and larger impact angle, but the specific wavelength first increases and then decreases