Question

Thermit welding is a form of; 1) Gas welding; 2) Fusion welding; 3) Resistance welding; 4) Arc welding

Answer 1

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Thermit welding is a form of; 2) Fusion welding

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Answer 2

Thermit welding is a form of 2) Fusion welding

• Thermit welding is based on the release of heat by the element to be used for joining.
• The reaction is exothermic which releases enough heat to not require an external heat source.
• Since the elements are fused, hence, thermit welding is a form of fusion welding.
• The example of thermit welding is -
• Fe2O3 + 2Al --> 2Fe + Al2O3. After the occurrence of this reaction, the iron fuses with the substance to be welded.