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Formation of micro-cracks and recast layer during EDM of mild steel using copper electrodes

Khan, Ahsan Ali and Adesta, Erry Yulian Triblas and Mohammad , Yeakub Ali (2011) Formation of micro-cracks and recast layer during EDM of mild steel using copper electrodes. In: Advanced Machining Processes. International Islamic University Malaysia, Kuala Lumpur, Malaysia, pp. 44-48. ISBN 9789674181628

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Abstract. The present paper reports on the influence of process parameters on formation of micro-cracks and recast layer on mild steel during EDM using a copper electrode. Surface quality was evaluated on the basis of work surface roughness, micro cracks and thickness of the recast layer. Current, pulse-on time, pulse-off time and voltage were the variable parameters for the present investigation. Micro cracks were found on the surface due to rapid heating and cooling of the surface during EDM. Micro cracks reduced in number and size when the surface was EDMed with a low current and a short pulse-on time. A layer of recast layer on the work surface was observed after EDM. The thickness of the recast layer was higher while a higher current together with a higher pulse-on time were used. It was concluded that in order to have a high quality surface it should be machined with lower values of current, pulse-on time and voltage.

Item Type: Book Chapter
Additional Information: 3129/25552
Uncontrolled Keywords: EDM, micro-crack; recast layer; mild steel; cooper electrode
Subjects: T Technology > TS Manufactures > TS200 Metal manufactures. Metalworking
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User: Prof. Dr. Ahsan Ali Khan
Date Deposited: 24 Sep 2012 15:30
Last Modified: 24 Sep 2012 15:41
URI: http://irep.iium.edu.my/id/eprint/25552

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