Question

write a short note on thermite welding please​

Answer 1

Answer:

Reduction of ferric oxide by Aluminium is used in thermite welding. A mixture of ferric oxide and aluminium powder is called thermite. It is placed in crucible made up of silica. It is ignited with the help of magnesium ribbon attached to magnesium powder and barium peroxide which constitutes starting plug. Upon ignition, magnesium burns in the presence of Barium peroxide which helps ignition. As a result of heat produced, aluminium present in thermite reduce ferric oxide to iron.

2Al + Fe2O3 --∆--> Al2O3 + 2Fe + heat.

Here, ∆ = heat.

The heat evolved keeps iron in molten state. It escapes from the tapping hole and fills the gap of the broken articles.

Answer 2

Thermite welding

                                           

Thermite welding is also known as Exothermic bonding. it is a welding process which employ the molten metal to the permanent.

                                   

Many metal constructors, vehicle constructors uses Thermite welding for joining the metal. It is used by very high level companies, because if we do melting with the help of Thermite welding, then the metal can be molded properly. As well as, It can be joined so permanently.

                         

Large machines and vehicles are also Welded by Thermite welding process. The metal welded by this process have capacity of holding high temperature. The satellites and space vehicles also uses Thermite welding process.

                         

In this method, this property works with 2Al + Fe2O3 --∆--> Al2O3 + 2Fe + heat.

=> 2Al + Fe2O3 --∆--> Al2O3 + 2Fe + heat is the chemical reaction of this thermite welding.

                       

Thermite welding ignited with the help of magnesium ribbon attached to magnesium powder and barium peroxide.