| The metal produced by explosive welding has good properties and lower cost than other welding methods,which is a very important part of the metal processing process.However,the explosion welding process is extremely short,it is impossible to directly study the characteristics of explosion welding through observation,and the welding quality is affected by parameters and processes,if the parameters and processes are experimented,not only the time is long,but also the cost will be greatly increased.The use of explosive welding numerical simulation technology has played a huge role in promoting the development of industry,not only improving the performance of materials,but also avoiding the waste of precious and rare metals.In addition,the traditional explosive welding technology has a low utilization rate for explosives,and the production efficiency of a single shot is not high.Based on this background,this paper uses numerical simulation to study the explosion welding between Q235steel/SUS304 stainless steel metal plate under colloidal water cladding,and discusses the influence of colloidal water cladding on explosive detonation rate and explosive utilization rate.In order to verify the feasibility of explosive welding between metal materials with large thickness differences,the explosive welding process between TA2 foil and Q235 steel was simulated and studied.Considering the efficiency problem in actual production,a stacked five-layer explosion welding test was numerically simulated to verify the feasibility of this scheme.Aiming at the problem of explosion welding of metal pipes,three different simulation algorithms were combined to simulate matryoshka explosive welding between copper/steel/aluminum tubes,and the utilization rate of explosives improved by matryoshka explosion welding and the advantages and disadvantages between different algorithms were studied.In order to explore the influence of incompressible water environment on explosion welding,the copper/steel explosion welding test was carried out with local water environment,and the microscopic characteristics of the interface between local water environment and metal bonding under atmospheric pressure were analyzed.The simulation results show that compared with the explosion welding without overlay,the impact velocity is increased by 39.3 %,58.1 % and 68.8 %,and the collision pressure is increased by 41.0%,65.3 % and 80.6% respectively when the overlay thickness is 15 mm,30 mm and 45 mm,respectively.The simulation results are basically consistent with the test results.TA2 foil with thickness of 0.1 mm,0.2mm,0.3 mm and 0.4 mm was used as the composite plate,and Q235 steel with a thickness of 20 mm was used as the substrate,and the explosion welding experiment of metal foil under different composite thicknesses was simulated in three dimensions.The dynamic parameters obtained in the simulation results are basically consistent with the calculated data,which fully proves that it is feasible to coat TA2 foil on Q235 steel by explosive welding.The three-dimensional and two-dimensional numerical simulations of Q235steel/304 stainless steel multi-layer explosion welding experiments were carried out to study the dynamic parameter distribution and bonding quality in the multilayer explosion welding process.The peak collision pressure of the composite plate in the three-dimensional simulation is calculated and compared with the simulation results,and the pressure distribution characteristics of the composite plate are explained by using the propagation law of vibration wave and detonation wave.The wave-like bonding interface of the substrate is obtained through two-dimensional simulation,which is consistent with the waveform obtained in the experiment,which verifies the excellent bonding quality of the substrate in the multilayer explosion welding experiment.The simulation results show that compared with single-layer explosive welding,multi-layer explosive welding can theoretically save nearly 68% of the amount of explosives,effectively saving production costs.1060 aluminum tube/T2 copper rod was selected as the preparation material of explosive composite rod and T2 copper tube/Q235 steel pipe was selected as the preparation material of explosive composite tube,and the explosion welding test of preparing two groups of explosive composite pipe rods was numerically simulated by using ANSYS/LS-DYNA software and combining three algorithms: Lagrange method,ALE method and SPH-FEM coupling method.The results show that the early modeling of the Lagrangian method is the most concise,followed by the ALE method.In the simulation process,the SPH-FEM coupling method takes the most time,and the ALE method takes the shortest.The collision velocity measured by the three algorithms has an error of 0.9 ～ 5.3 % from the theoretical calculation value,among which the error of the SPH-EFM coupling method is the smallest and the error of the Lagrange method is the largest.The principle of energy accumulation inside the pipe was used to explain the diameter expansion of the external composite pipe during the welding process,and the phenomenon was verified by combining the pressure distribution at the composite interface of T2 copper pipe/Q235 steel pipe.Based on the traditional explosive welding charge method and the local water environment charging method,the explosion welding experiment was carried out,and several sets of high-quality copper/steel explosive composite pipes were prepared.Light microscopy and transverse compression experiments were used to analyze the binding interface and mechanical properties of the specimen.The results show that the waveform size of the copper/steel interface is positively correlated with the thickness of the explosive,and when the thickness of the explosive reaches 16 mm,the highest mass microwaves with wavelengths and amplitudes of 21 μm and 97 μm are obtained,respectively.Compared with the conventional charging method,the local water environment charging method can save about 61% of the explosive amount under the same experimental conditions.With the decrease of the thickness of the explosive,the yield strength of copper steel specimens a～d was 78 MPa,67 MPa,51 MPa and 49 MPa,and the compressive strength was 98 MPa,90 MPa,77 MPa and 71 MPa,respectively.It shows that the yield strength and compressive strength of copper/steel specimens are positively correlated with the thickness of explosives.Figure [50],Table [22],Reference [114]... |
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