Question

Define Thermit Reactions? How thermit reaction is used in Welding?

Answer 1

The thermite reaction is the reaction of metal oxide with the aluminium. The aluminium acts as a reducing agent and the reaction is highly exothermic and hence called a thermite reaction. The aluminium reduces the oxide of another metal, most of the times, it is iron oxide (FeO) because aluminium is highly reactive.


Unlike an arc welding process, thermite (TW) don't need the production of the high-temperature arc, instead uses the resultant heat of highly exothermic reaction, to make welds. Normally the reactants used in thermite welding are; metal and metal oxides.

Answer 2

$\underline{\underline{\huge{\textbf{Answer :}}}}$


When $Al$ reacts with $Fe_{2}O_{3}$ then $Al_{2}O_{3}$ and $Fe$ is produced...

$2Al\:+\:Fe_{2}O_{3}$-----> $Al_{2}O_{3}\:+\:2Fe$

Here;

Aluminum = $(Al)$

Iron oxide = $(Fe_{2}O_{3})$

Aluminum oxide = $(Al_{2}O_{3})$

Iron = $(Fe)$

The above Reaction is highly exothermic... due to this the produced iron is molten in state... Which helps in joining crack parts of the machine and also helps in joining railway tracks...

This whole process is known as Thermit process...

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