Research of Explosive Welding: Numerical Simulation and Analysis

Abstract

To improve understanding of explosive welding and relate the effect of the process variables on the physical parameters, the smooth particle hydrodynamics (SPH) method in the LS-DYNA 12.0 finite element program was adopt to simulate the process of two-layer steel explosive welding. Temperature field near the stagnation point was calculated according to the work-heat transfer theory. Finally, the formation mechanism of the interface wave was analyzed under the condition that strain field, temperature field etc. were considered. The results show that: the phenomenon of jetting and the interfacial waves observed in explosive welding were quite well reproduced in these simulations; the changing collision angle with propagation distance is directly responsible for the change in interface morphology from wavy to smooth at the welding front; the maximum stress ,strain and temperature are localised at the wavy interface zone; the maximum temperatures near the interface will be high enough under proper conditions and this will be helpful for the formation of the jet and the wavy interface.