ALUMINO THERMIC PORTIONS & WELDING OF RAILS


PRINCIPLE :


Thermit Welding is a fusion welding process, based on Alumino-thermy which uses a chemical reaction for producing the hot liquid alloy.

This is based on widely practiced unique THERMIT PROCESS which involves a highly EXOTHERMIC reaction between Iron Oxide and Aluminium giving rise to enormous heat producing molten metal of the desired chemistry.


REACTION : Fe2 O3 + 2 Al = 2 Fe + Al2 O3 + 181.5 K. Cal of Heat


The hot molten metal is allowed to be poured into suitable mould encapsulating the pre-heated affected parts to be welded, thus the metallurgically bonded sound joint.