Why aluminium is used to join railway track and cracked machine
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aluminium powder as a reducing agent is called a thermite reaction. reduction property of aluminium is used in thermite welding for joining the broken pieces of heavy iron objects like girders, railway tracks or cracked machine parts. ... Aluminium reduces iron oxide to produce molten iron metal with the evolution of heat.
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When Aluminium is heated with Fe2O3 it is reduced to iron and a lot of heat is produced which melts the iron. The molten iron fills the space between the railway tracks and joins them. This reaction is called as Thermit reaction. The chemical equation for this process is Fe2O3 +2Al----------2Fe+Al2O3+ heat
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