| 2002 №02 (05) | 2002 №02 (07) |
The Paton Welding Journal, 2002, #2, 28-32 pages
Special conditions for formation of joints in shock wave welding of metals
L.D. Dobrushin, Yu.I. Fadeenko, V.G. Petushkov
E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.Abstract
In explosion welding of pure aluminium, the initial region of a joint can be formed under special conditions, corresponding to a high-velocity movement of a contact point. This region of the joint is characterised by high porosity and low strength, and only special measures allow shortening its length or eliminating it completely. An interpretation of the mechanism of formation of cumulative jets is given, attributing it to the instability of flow of the surface metal layer, which is slowed down upon approaching the contact zone of plates. It is suggested that the same mechanism is responsible for the formation of "humps" under conditions of explosion welding involving wave generation.
Keywords: explosion welding, shock wave welding, contact point velocity, cumulative jet, centrifugal forces, wave generation mechanism
References
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