Explosive welding is one of the cold state welding process. This is define as, the
weld joint is made by the effect of high velocity movement, which is totally controlled
by explosion or detonation.
The explosive welding is basically a collision between components in high velocity
or motion. High velocity is created by an explosive charge element.
Explosive welding process:
In bellow illustrated picture shown a parallel metal (metal 2) positioned above the
another parent metal (metal 1) which to be weld. The metal 2 adopted a explosive.
The explosive is placed on a buffer ( a piece of rubber or cardboard, which protect
the top surface from damage of explosion).
The parent metal placed on anvil. The detonator is ignited and exploded. The detonation
velocity is less than the sonic velocity in the metal 1 and metal 2.
A extremely high pressure is generated due to explosion and provides a relative shear
or sliding pressure between metal 2 and metal 1 or parent metal.
This time both metals behave like viscous fluids, which obey the law of fluid mechanics.
A thin high velocity is formed on the surface of both metals due to relative motion.
This is sufficient velocity to sticking the both metals.
Application of explosive welding:
This process has broad use in plugging of nuclear heat exchanger.