Investigation of Surface Roughness for Inconel 625 using Wire Electric Discharge Machining

Due to the increase in the demand of materials with good surface finish and complex shapes, conventional machining processes became out of date. This directed to the increasing demand of non-conventional machining processes. This research work is focuses on the optimization of Surface Roughness (SR) using Wire Electrical Discharge Machining (WEDM) method on Inconel 625 super alloy material. The diffused wire tool electrode (plain and cryo-treated) is used for experimental work. Taguchi's L₁₈ (2¹*3⁵) orthogonal array's has been used to design for experimental run. The machining parameters selected for optimization are tool electrode, current (Ip), pulse on time (T_on), pulse off time (T_off), wire feed (W_f) and wire tension (W_t). Rectangular slits has been fabricated, which are useful for many industrial application like increase the heat transfer rate of fluids, micro-channels, micro-fins etc. Design of Experiment (DoE) optimization technique is used to find the most significant factor. (paper)