EXPLOSIVE WELDING is a PROCESS to produce bi- metallic cylindrical components. The PROCESS is dynamic and for a chosen geometrical configuration and material properties, is completed in 30m Sec. This paper includes the implication of a finite element engineering package and JWL type pressure- time equation to model the contact response between two similar materials at a very high strain rate - which accurse in EXPLOSIVE WELDING of cylindrical components. The simulation employs the FE ABA QUS/Explicit code and the cylindrical components (tube and plug) are assumed to be made from an aluminum alloy, with isotropic work and hardening characteristics. The aim of present research work is to find the important parameters, such as impact velocity of tube to plug, the dynamic angle, the pressure of the explosion at the point of contact between EXPLOSIVE material and tube, the amount of stress and strain in the tube during the deformation. With use of simulation results, various thickness of Aluminum tube and curve plug were EXPLOSIVEly welded. The interfacial zone at the welded interface is composed of a wavy structure by intensive plastic deformation of the Aluminum alloy. The weld ability of Aluminum tube is decided by the change in impact velocity and dynamic angle, which are achieved with the geometry of curve plug. Finally the models are validated by the results from EXPLOSIVE WELDING experiments.

The aim of this work is to find the important parameters, that include impact velocity of tube to plug, the dynamic angle, the pressure of the explosion at the point of connection between EXPLOSIVE material and tube, the amount of stress and strain in the tube during the deformation, and the kinetic energy and strain energy that remain in the tube. Our simulation of this mode ling is done with ABAQUS software in two dimensions.With these parameters, and with change of the geometric condition similar to the standoff distance, boundary condition, initial condition and the use of specific geometry of the impactor, it is possible to achieve a good joint in this PROCESS.

It is possible and practicable to make a joint in similar materials, whereas, bonding of dissimilar metals in order to achieve applicable components has been subjected to many investigations. The purpose of this study is to produce scarf joint through EXPLOSIVE WELDING PROCESS (EXW) between chamfered end of aluminium and copper plates. Macroscopic observations and mechanical properties of interface, such as bond shear strength and micro-hardness was carried out on the bond interface. Mathematical models were adopted for the interface properties of the scarf joint to make relationship between the bond shear strength and EXPLOSIVE loading ratio with regression method and variance analysis. These models verify in EXPLOSIVE cladding PROCESSes. Consequently, mathematical model which is based on scarf joints in dissimilar metals could predict bond properties of cladding metals under desired EXPLOSIVE loading and flyer plate thickness. This led to establishment of appropriate model to explain shear strength- EXPLOSIVE loading ratio.

GMDH-type neural networks are used for the modelling of EXPLOSIVE WELDING PROCESS of plates. The aim of such modelling is to show how the geometric characteristics of the bonding interface such as amplitude and wave length change with the variation of important parameters involved in the EXPLOSIVE WELDING of plates, namely, standoff distance, mass of the EXPLOSIVE per unit weight of flyer plate, flyer plate thickness, and parent plate thickness. It is also demonstrated that Singular Value Decomposition (SVD) can be effectively used to find the vector of coefficients of quadratic sub-expressions embodied in such GMDH-type networks. Such application of SVD will highly improve the performance of GMDH-type networks to model the very complex PROCESS of EXPLOSIVE WELDING of plates.

Some Micro structural Aspects of EXPLOSIVE WELDING Interface between Aluminum and Steel which welded in Different Conditions have been studied. Wavelength, amplitude and Interlayer Phase Dimensions Formed in the WELDING Interface have been measured by means of an Optical Microscope. By Comparing Welded Samples, it is Determined that the Greater Stand off Distance, the Larger Interface Dimensions, But Interface Wavelength and Amplitude have not been Changed with Stand off Distance Variations. It has been concluded which an Increase in EXPLOSIVE Mass and a Decrease in Flyer Tube Thickness, Will Result in Increase in Wavelength and Amplitude and Interlayer Phase Dimensions.

PROCESS of EXPLOSIVE form-cladding for two inhomogeneous plates, which WELDING them in solid state, involves simultaneous plastic deformation, is investigated analytically and experimentally. Given analytic model, is based on energy method, and considering support conditions, deformation, and impact's critical amount.Two-metal plates are converted to their equivalent homogeneous plate, with a method similar to the analysis of combined beams. Then, replacing equivalent static force, maximum deformation of plate, and possibility of rupture is predicted with respect to plates' mechanical properties. Significant factors, like velocity -which is necessary to compute impact-, is determined and weld ability of inhomogeneous plates is studied with taking into consideration WELDING window. Then amount of experimental deformation is compared with analytical values and rather good similarities are observed.

Effects of some important parameters like impactor effects, plug geometry and initiation points on bonding aluminum tubes to aluminum plugs were studied. The impact velocity and dynamic angle between tube and plug should be precisely managed to achieve an optimum bonding condition. A new EXPLOSIVE bonding technique with the use of two material impactors was proposed. Results are especially suitable for using high-speed EXPLOSIVE materials to bond welded parts having dissimilar properties. A WELDING window was first presented for bonding aluminum tube to aluminum plug with the help of the experimental data. Numerical simulation was then performed to understand the effect of impactor on flat and curved plugs:. However, due to limited data analysis systems used to register EXPLOSIVE WELDING parameters, it became evident that numerical analysis was necessary. The important findings were, therefore, explosion modeling and fast tube deformation. For low PROCESS duration time and fast deformation, the modeling is very difficult. At the same time, numerical analysis with Abaqus software was performed to investigate the bonding conditions. The calculated impact velocity of the tube and the dynamic angle between the tube and the plug were compared with the numerical results under the same conditions. It was shown that the numerical analysis was consistent with the predicted data. Eventually we concluded that in EXPLOSIVE WELDING, curved plugs were more advantageous than flat plugs. It can be recommended that due to having a connection surface in high-speed EXPLOSIVEs, the use of plastic impactors is more favorable than using hypoelastic impactors.

The purpose of this study is to produce scarf joint through EXPLOSIVE WELDING PROCESS (EXW). The scarf weld is a PROCESS in which the final bond interface is oblique. With applying the EXPLOSIVE WELDING technique, this joint can create a metallic bond between similar or dissimilar metals. In this study, chamfered end of aluminum and copper plates were joined EXPLOSIVEly and named scarf joint, employing changes in chamfered angle at different stand-off distance and EXPLOSIVE loading. The geometry of scarf joint enables consideration of both flyer and base plate thickness and EXPLOSIVE loading and the effects on mechanical properties of interface such as bond shear strength and micro-hardness can be investigated. Mathematical models developed for the interface properties of scarf joint to make relationship between the bond shear strength and EXPLOSIVE loading ratio. To check the adequacy of developed models, mechanical properties of interface, such as bond shear strength, predicted and compared with actual values in EXPLOSIVE cladding PROCESS. The results show reasonable agreement with theoretical predictions. Consequently, mathematical model which is based on scarf joints, can predict bond shear strength of cladding metals under desired EXPLOSIVE loading and flyer plate thickness.

In this research, EXPLOSIVE cladding PROCESS of the internal surface of CK22, carbon steel pipes with 316L, stainless steel pipes, has been investigated from some points of view. At first, using the available theoretical- experimental relations, the EXPLOSIVE window of two metals was achieved and then, using LS-DYNA software, different steps of finite elements simulation of the PROCESS were explained. Some experiments were performed and their results were reported at the end. The minimum surface quality to get a desirable weld was obtained and moreover, the results of both theoretical and numerical approaches were examined and their convergence was established.

The most important application of EXPLOSIVE WELDING in cylindrical geometry is cladding of cylindrical surfaces in order to increase corrosion and wear resistance and also improving the mechanical properties of bimetal product. In this study, the EXPLOSIVE WELDING of bimetal tubes made of steel and Phosphor-Bronze was investigated using two EXPLOSIVEs (TNT and Amatol 5-95) with different explosion velocity. At first the EXPLOSIVE window of two metals was achieved using the theoretical experimental relations, and then using different experiments, the key role of explosion velocity and also the position of selected parameters of EXPLOSIVE window in the metals weld ability were determined. At the end, the successful method of manufacturing of this bimetal tubes is presented and commented upon.