Detonation Properties Of Emulsion Explosives With RDX Added And Application In Metal Foil Explosive Welding

The chemical industry,marine ship operations and other requirements for the surface anti-corrosion of materials,as well as the requirements of large industrial equipment for the wear resistance and fatigue resistance of materials,the surface treatment requirements of materials are becoming more and more intense.In order to save the use of precious metals on the surface of materials,it is necessary to carry out Research on metal foil explosion welding.Metal foil explosion welding has not been industrialized,and research is relatively rare,mainly because the critical thickness of conventional explosives used in explosive welding is very large(usually about 10 mm),because of the low detonation requirements of explosive welding for explosives,usually An inert additive is added to the explosive to reduce the rate of detonation,but this will increase the critical thickness of the explosive.This thick explosive not only reduces the energy utilization rate of the explosive,but also easily damages the foil due to excess energy,and the yield is low.Therefore,reducing the critical thickness of explosives is an ideal way to improve welding quality and economic benefits.Therefore,we propose to introduce a high-energy additive,RDX,into the traditional emulsion explosives to reduce the critical thickness of mixed explosives.Reduce the amount of drug used in explosive welding to complete the research idea of explosive welding of metal foil.The effects of adding different content of RDX on the explosive performance of mixed explosives were studied in the air explosion and underwater explosion experiments.The results show that the critical thickness and the sharpness of mixed explosives decrease with the increase of RDX content,and the decrease rate decreases.The explosive velocity of mixed explosive increases with the increase of charge thickness and RDX content,but at different contents.When the thickness of the mixed explosive charge reaches a critical thickness,the detonation speed is basically the same,about 2500 m/s.The energy output parameters(shock overpressure peak,shock wave impulse,specific shock wave energy,specific bubble energy,total energy)of the mixed explosive underwater explosion increase with the increase of RDX content.Adding RDX has a more significant effect on the reduction of the critical thickness of the mixed explosive than on the increase in energy output.Explosive welding of AA1060 aluminum foil-Q235 steel with mixed explosives without RDX and 10%RDX was added.The macroscopic results have shown that the former has defects such as severe damage of aluminum foil,warpage of welded parts,and welding.The welding has been completed and the effect is good.The latter were subjected to metallographic observation,scanning electron microscopy,hardness test,tensile bending test and other analytical methods.The results show that the interface of the explosion-welded joint has a corrugated structure.From the detonation end to the end,the corrugated structure becomes more and more obvious,and the wavelength and amplitude It is getting smaller and smaller;the whole bonding interface has a melting zone with discontinuous distribution and uneven thickness.The aluminum foil and the steel form a metallurgical bond;the hardness test shows that the hardness near the bonding interface is improved;the tensile bending test shows that the AA1060 aluminum foil/Q235 steel is combined.There was no delamination at the interface,and there was no tear in the aluminum foil,indicating that the aluminum foil-steel bond strength was high,and the aluminum foil maintained good toughness after being subjected to explosion welding.