A Study on the Metal Jet Occurred in Explosive Bonding

Abstract

This paper describes an experiment concerning the process of explosive bonding. The process of collision of two metal plates and the metal jet in the space ahead of region of collision point was directly observed by high speed photographs using a flash X-ray and a streak camera.
A metal jet emits brillant light in the air, but in case of Al-Al, dark spherical portions are observed in the metal jet; they are considered to be drops of aluminum (Photo. 6, 7).
In the symmetric collision of same materials, the jet velocity ν_j is decreasing monotonously with the set angle a. However, since the velocity of collision point ν_c decreases more rapidly than the jet velocity ν_j the ratio ν_j/ν_c increases.
In the case of α=cont., the jet velocity ν_j decreases with the increase of the plate thickness and its density (Fig. 9, 11).
In the case of dissimilar metal bond, the direction of jet flow shows a tendnecy to be declined to the side of heavy density metal. This tendency of declination and velocity of jet seem to be introduced by light density metal (Photo. 10, Fig. 13).
In the case of the asymmetric bond, when the difference of density between two metals is small, jet flows along the flyer plate (Photo. 13, 14).