Question

what is thermite welding??
why is aluminium preffered for this process??
give the balanced equations​

Answer 1

Explanation:

The reduction of a metal oxide to form metal by using aluminium powder as a reducing agent is called a thermite reaction. It is an exothermic reaction in which a large amount of heat is evolved. This 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.

Example: A mixture of iron (III) oxide and aluminium powder is ignited with a burning magnesium ribbon. Aluminium reduces iron oxide to produce molten iron metal with the evolution of heat.

Fe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s) + Heat

The molten iron produced is then poured between the broken iron pieces to weld them.

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Answer 2

answer:

1. Exothermic welding, also known as exothermic bonding, thermite welding (TW), and thermit welding, is a welding process that employs molten metal to permanently join the conductors. The process employs an exothermic reaction of a thermite composition to heat the metal, and requires no external source of heat or current.
2. Among the family of lightweight materials, aluminium alloys have been extensively used in the automotive and aircraft body structures [5], due to the advantages of low density, high strength to weight ratio, good corrosion resistance and relatively low cost compared with composites
3. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.