The mechanism of material removal in EDM process is

melting and evaporation

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melting and corrosion

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erosion and cavitation

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cavitation and evaporation

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Solution

The correct option is A melting and evaporation
Material removal takes place due to erosion by repeated spark. After that melting and evaporation takes place.

Suggest Corrections

	Machining process		Manufacturing Processes
P.	Chemical machining	1.	Erosion
Q.	Electro-chemical machining	2.	Corrosive reaction
R.	Electro-discharge machining	3.	Ion displacement
S.	Ultrasonic machining	4.	Fusion and vaporization

P.	Abrasive grain throwing and hammering	1.	ECM
Q.	Erosion due to vaporization	2.	USM
R.	Chiping and erosion	3.	PAM
S.	Melting and partial vaporization	4.	EDM
T.	Electrolysis	5.	AJM