Study on Wire Electrical Discharge Machining of Inconel-625

  • Claver Nsanzumuhire Jomo Kenyatta University of Agriculture and Technology
  • Bernard W. Ikua Jomo Kenyatta University of Agriculture and Technology


Wire Electrical Discharge Machining (WEDM) is one of the non-conventional methods for machining of materials that are difficult to machine using conventional means. In WEDM, the optimum machining process parameters are governed mainly by the properties of workpiece material. Determination of these parameters presents a challenge to machining process planners. Improperly selected parameters for WEDM may result in low Material Removal Rate (MRR), short-circuiting of wire, wire breakage and poor surface finish. In this paper, the effect of Pulse-on time, Gap voltage and Wire Feed Rate on Surface Roughness (SR) and Material Removal Rate in WEDM of Inconel-625 is analyzed. Experiments are carried out for a wide range of input parameters and analysis is carried out on their effects on machining performance. The results show that both MRR and SR increase with increase in Pulse-on time. Also, the best surface finish (Ra = 3.5 μm) is obtained when the Pulse-on time is below 15 μ sec. The maximum MRR is  obtained at a Pulse-on time ranging between 20-25 μsec.
Keywords—Gap Voltage, Material Removal Rate, Pulse-on time, Surface Roughness, Wire Electrical Discharge Machining, Wire Feed Rate.
Jun 25, 2018
How to Cite
NSANZUMUHIRE, Claver; IKUA, Bernard W.. Study on Wire Electrical Discharge Machining of Inconel-625. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 118-121, june 2018. ISSN 2079-6226. Available at: <>. Date accessed: 07 apr. 2020.