THERMIT WELDING
It may be of forge or fusion kind of welding.
Fusion welding requires no pressure. Thermit welding process is depicted in
Fig. It is a process which uses a mixture of iron oxide and granular
aluminium. This mixture in superheat liquid state is poured around the parts to
be joined. The joint is equipped with the refractory mold structure all around.
In case of thermit pressure welding, only the heat of thermit reaction is
utilized to bring the surface of metal
to be welded in plastic state and pressure is the applied to complete the weld.
The temperature produced in the
thermit reaction is of the order of 3000°C. Thermit welding is used for welding
pipes, cables, conductors, shafts, and broken machinery frames, rails and repair of large gear tooth.
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