Question:
Which of the following is NOT a primary mechanism of material removal in Electrical Discharge Machining (EDM)
Which of the following is NOT a primary mechanism of material removal in Electrical Discharge Machining (EDM)
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Differentiate clearly between EDM and ECM.
EDM is a thermal process (uses spark melting and vaporization in an insulating dielectric).
ECM is a chemical process (uses electrochemical dissolution in a conducting electrolyte).
EDM is a thermal process (uses spark melting and vaporization in an insulating dielectric).
ECM is a chemical process (uses electrochemical dissolution in a conducting electrolyte).
Updated On: Jul 9, 2026
- Thermal melting and vaporization by spark energy
- Electrochemical dissolution in the dielectric
- Re-solidification and flushing of molten droplets
- No direct mechanical contact
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify which of the given options is not a primary mechanism of material removal during Electrical Discharge Machining (EDM).
Step 2: Key Formula or Approach: This is a theoretical production technology question. EDM is a thermal non-traditional machining process that removes material through localized melting and vaporization using high-frequency electrical sparks.
Step 3: Detailed Explanation:
• In EDM, electrical sparks are generated in a dielectric fluid between an electrode tool and a conductive workpiece.
• The intense heat of the spark melts and vaporizes the workpiece material at the point of contact (Option A).
• When the spark cycle ends, the dielectric fluid flushes away the molten droplets, some of which may partially re-solidify into small spheres (Option C).
• Because the tool and workpiece do not make physical contact, there are no mechanical forces or direct mechanical contact involved in material removal (Option D).
• Option (B): Electrochemical dissolution is the material removal mechanism for Electrochemical Machining (ECM) based on Faraday's Laws of Electrolysis. It does not occur in EDM, where the dielectric is an electrical insulator, not an electrolyte.
Step 4: Final Answer:
Electrochemical dissolution in the dielectric is not a mechanism of material removal in EDM.
The question asks to identify which of the given options is not a primary mechanism of material removal during Electrical Discharge Machining (EDM).
Step 2: Key Formula or Approach: This is a theoretical production technology question. EDM is a thermal non-traditional machining process that removes material through localized melting and vaporization using high-frequency electrical sparks.
Step 3: Detailed Explanation:
• In EDM, electrical sparks are generated in a dielectric fluid between an electrode tool and a conductive workpiece.
• The intense heat of the spark melts and vaporizes the workpiece material at the point of contact (Option A).
• When the spark cycle ends, the dielectric fluid flushes away the molten droplets, some of which may partially re-solidify into small spheres (Option C).
• Because the tool and workpiece do not make physical contact, there are no mechanical forces or direct mechanical contact involved in material removal (Option D).
• Option (B): Electrochemical dissolution is the material removal mechanism for Electrochemical Machining (ECM) based on Faraday's Laws of Electrolysis. It does not occur in EDM, where the dielectric is an electrical insulator, not an electrolyte.
Step 4: Final Answer:
Electrochemical dissolution in the dielectric is not a mechanism of material removal in EDM.
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