Numerical Simulation And Experimental Analysis Of Explosive Welding Of Titanium/Aluminum Clad Plate

The layered metal composite plate produced by explosive welding process having physical and chemical properties which pure metal does not have,and the complementary of the properties of different materials during explosive welding process is the main reason.Titanium/aluminum explosive welding composite materials both have the excellent corrosion resistance of titanium and the light weight,good thermal conductivity of aluminum alloy.and also high bonding strength of welding interface.All the properties mentioned above make them shining in the field of military industry and aviation.However,titanium/aluminum composite plate used in aerospace field needs to be imported from Japan,Russia,the United States and other countries so far,and the reason is that the domestic research on titanium/aluminum composite plate starts late and the product can not fullfill the requirement of high technique(i.e.the astronomy industry),which hinders the localization of China's aviation industry.There are many factors affecting the bonding quality of Ti/Al composites,among which the manufacturing technology is the main one.In this study,a new manufacturing technology by adding a transition layer(1060 pure aluminum)was proposed.The research of the effect of transition layer on welding quality of pure aluminum was conducted by simulation and experimetal test.The main work and research results are as follows:Firstly,the theoretical value of static process parameters of Ti/Al composite plate was calculated using the theoretical formula of explosive welding.The explosive welding process of TA1/5052 and TA1/1060/5052 composite plates was studied using ANSYS/LS-DYNA.The pressure distribution,velocity change and displacement change of the two groups of models were compared and analyzed.The results show that: the transition layer can reduce the excessive impact pressure and flight speed,and make the substrate and cladding more stable.Secondly,ANSYS/LS-DYNA software was adopted to simulate the explosive welding process of TA1/1060/5052 under different static process parameters,and the data of velocity change,displacement change and maximum plastic strain were obtained,which were compared with the theoretical calculation results.The results show that: under the condition of constant plate gap,the maximum velocity of cladding plate increases with the increase of powder thickness;under the condition of constant powder thickness,the maximum velocity of cladding plate first increases and then decreases with the increase of plate gap.Finally,TA1/5052 and TA1/1060/5052 composite plates were produced by explosive welding process.The microstructure and mechanical properties of TA1/5052 and TA1/1060/5052 composite plates were analyzed by metallographic observation and mechanical properties test.The test results show that: the transition layer 1060 pure aluminum plate can better combine the TA1 plate and the 5052 aluminum alloy plate which is not easy to combine;compared with TA1/5052 composite plate,the elongation and shrinkage rate of the area of TA1/1060/5052 composite plate are significantly improved,the tensile strength and shear strength are also increased,and the composite plate can bear greater plastic deformation.This study can provide a theoretical basis and technical support for the preparation and manufacture process optimization of Ti/Al composite plate.