Modeling of White Layer Thickness During EDM of AISI 4340 Using Cu–W tool

The present investigation is performed for estimating the white layer deposited on the electro-discharge machined surface post-machining. Copper-tungsten is used as tool material while AISI 4340 is selected as the workpiece. AISI 4340 possesses high toughness, wear-resistant and is majorly applicable in automotive industries. Response surface methodology (RSM) with central composite design (CCD) is implemented for designing the experiments with current, on-time of pulse, voltage, and duty factor as the EDM constraints. Later, scanning electron microscopy (SEM) was executed to estimate the thickness of the deposited white layer. The model suggested that current, on time of pulse and voltage are crucial terms while duty factor is found to be the only non-influential parameter for the thickness of the white layer. Current being an important parameter influences the WL deposition as it has p -value