In order to investigate the influence of negative pressure on the interface of T2/Q235 explosive-welded composite plate,low-explosion-velocity diatomite-sensitized powder emulsion explosive with low explosion velocity was used as the welding special explosive,and T2 and Q235 were used as cladding and base plate,respectively.The explosive welding tests were carried out under atmospheric pressure(100kPa),60kPa,and 20kPa ambient pressures,respectively.The morphology and elemental composition of the composite interface were studied by means of metallographic analysis.The mechanism of neg-ative pressure explosive welding was further revealed by numerical simulation.The results show that the charge density of pow-der emulsion explosive is increased under negative pressure conditions.The detonation velocity of powder emulsion explosive is not changed,and the brisance of powder emulsion explosive under 20 kPa is 8.4％higher than that under ambient pressure con-dition.With decrease of ambient pressure,the interface wave height and wavelength of the composite plate gradually increa-ses.At 20kPa,the wave height and wavelength increase by 49％and 23％,respectively.The oxygen element of T2/Q235 bonding surface under negative pressure is lower than that under ambient pressure.The numerical simulation results show that the T2/Q235 interface wave increases with the increase of explosive density,which is consistent with the experimental results.In the explosion welding process,the impact velocity and pressure of explosives increase by 16.3％and 66.3％respectively,when the charge density of explosive was 0.8 g/cm3 under negative pressure(20 kPa)as compared to 0.711 g/cm3 under nor-mal pressure.The results show that the negative pressure improves the efficiency of explosive energy in explosive welding com-pared with normal pressure.
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