Impact Welding of Aluminum Tube to Stainless Steel Target -Effect of Deformation of Tubular Projectile on Bonding Interface-
Hidefumi DATE
Abstract:A tubular aluminum projectile, subjected to a longitudinal impact, was impact-welded onto a stainless steel target using a gas gun at impact velocities of 200 m/s or more. The bonding area was estimated using scanning acoustic tomograph. The microstructures and element distribution in the joint were analyzed by means of SEM and Energy dispersive X-ray spectroscopy. The bonding strength was measured by a tension test. Additionally, the experimental results were compared with the numerical one obtained using the finite element method. It appeared that the aluminum projectile was bonded to stainless steel target at the impact velocity from 200 to 300 m/s. The bonding strength of aluminum / stainless steel joint showed the maximum of 190 Mpa at 230 m/s and decreases with impact velocity. The bonding strength at the impact velocities of 220 ~ 240 m/s was stronger than that of aluminum. The numerical results clearly showed that the temperature rise due to the conversion of the plastic work has influence on the profile of the projectile after deformation. Key Words:Tube impact -welding , Aluminum / Stainless steel joint, Compound layer, Bonding strength, Finite element analysis