R. Meyer J. Köhler A. Homburg Explosives

129 Explosive Forming and Cladding
release of gases. An explosion causes pressure waves in the local
medium in which it occurs. Explosions are categorized as deflagrations
if these waves are subsonic and detonations if they are supersonic
(shock waves).
Explosion Heat
W Heat of Explosion
Explosion Temperature
Explosionstemperatur; température d’explosion
Explosion temperature is the calculated temperature of the fumes of
an explosive material which is supposed to have been detonated while
confined in a shell assumed to be indestructible and impermeable to
heat; the calculation is based on the W Heat of Explosion and on the
decomposition reaction, with allowance for the dissociation equilibria
and the relevant gas reaction (W Thermodynamic Calculation of Decomposition
Reactions). The real detonation temperature in the front
of the shock wave of a detonating explosive can be estimated on the
strength of the hydrodynamic shock wave theory, and is higher than
the calculated explosion temperature.
Explosive Forming and Cladding
Metallbearbeitung durch Sprengstoffe; traitement des métaux par explosion
The applicability of explosive matrials for metal forming have been
studied with three different objectives in view: sheet forming and
matrix forming of flat items by pressure impact; metal plating; surface
hardening of manganese hard steel.
The application of the pressure shock of an explosive to form very
large workpieces is primarily intended, to achieve the shaping of a
workpiece without using presses, which are very expensive. The transmission
of the pressure impact takes place under water. Preliminary
experiments gave encouraging results, but a large-scale industrial
application has not yet been developed.
The development of explosive cladding is very much more advanced:
the metal sheet to be cladded is exploded onto the base material,
parallel to it or at a certain angle. In this way it is possible to effect
cladding tasks which would be impossible to fulfil by manual welding,
owing to the formation of brittle intermediate alloys between the plat-