Research of Energy Deposition Caused by Micro-Explosive Welding in Explosive Consolidation of Metal Powders

Abstract:

Energy deposition at the interface of the particles caused by micro-explosive welding in explosive consolidation of metal powders is analyzed by symmetrical impaction model of uncompressible liquid. Two-dimensional equation of energy in the flow field of explosive welding is deduced and solved by finite difference method. Then the distribution of the temperature in the flow field is calculated on the basis of considering the adiabatic compression. The results show that under an appropriate pressure the temperature rise near the welding interface caused by micro-explosive welding in explosive consolidation of metal powders will be higher than the melting point of the materials, and the thin melted layers are localized on the surfaces of the particles, the temperature rise increases with increasing of approaching flow velocity and impact angle.

Key words:explosive consolidation of powders; explosive welding; adiabatic compression; temperature field; finite difference method