Chemistry
Aluminium powder is used in thermite welding because :
- it is strong reducing agent
- it is strong oxidizing agent
- it is corrosion resistant
- it is a good conductor of heat.
Metallurgy
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Answer
it is strong reducing agent.
Reason — Aluminium is a strong reducing agent, it reduces Fe2O3, to Fe which fills the gap. Hence it is used for thermite (Fe2O3) welding.
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