Fundamental Studies on Explosive Welding : Observations of Metal jet and wavy pattern

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Metal jets formed during explosive welding of similar and dissimilar metals and wavy patterns at bonded interfaces have been examined extensively by using a high speed streak camera and an optical microscope. In the symmetric collision between similar metals the metal jet containing the mist and massive materials of component metals spouts in the direction bisecting the collision angle. As the initial set angle increases, the jet velocity decreases, but the ratio of the jet velocity to the collision velocity increases. In the collision between dissimilar metals the metal jet has a tendency to spout along the surface of the metal plate of higher density. The wavy pattern observed at the bonded interface between dissimilar metals changes in the wide range from sine wave to collapsed wave with decreasing the ratio between the densities of both metals. In the case of the explosive welding between dissimilar metals the change of the direction of the metal jet and the deviation from sine wave can be interpreted by applying Bernoulli's law, if the colliding process is assumed to be similar to the collision between two streams of ideal fluids of different densities.
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