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In Electro discharge machining, some annealing of the work piece can be expected __________ the machined surface.

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in Advanced Machining by (962k points)
In Electro discharge machining, some annealing of the work piece can be expected __________ the machined surface.

(a) On

(b) Just below

(c) Above

(d) At bottom

The question was posed to me during an internship interview.

I want to ask this question from EDM-Heat Affected Zone (HAZ) topic in section Thermal Processes of Advanced Machining

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Best answer
Correct answer is (b) Just below

The explanation: Annealing of some part of the work piece in EDM can be expected just below the machined surface.

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