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Write a note on thermite welding? |
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Answer» Thermite is a mixture of 3 parts of ferric oxide and one part of aluminium powder. On the top of the thermite mixture, an irgnition mixture of potassium chlorate and magnesium powder is placed. A burning Mg riboon is inserted into the ignition mixture, which catches the fire and ignite the thermite. During this reaction ferric oxide is converted into iron and a large amount of heal is evolved and about 3000°C temperature is achieved. Fe2O, + 2Al ⟶ 2Al2O3 + 2Fe + Heat The formed liquid iron is allowed to drop over the gap between the broken piece and thus they join together. This process is termed as boldschmidts aluminothermic process. |
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