This research article presents the optimization of process parameters for pulsed current gas tungsten arc welded austenitic stainless steel AISI 304L of 4mm thickness. Investigations were carried out to study the effect of frequency with respect to penetration and bead width to penetration ratio (Aspect Ratio). Three level 4 factor Taguchi L9 orthogonal array was used to carry out the bead on plate welds. Taguchi analysis was done for main effects plot to optimize the process parameters and ANOVA was used to find the percentage contribution of each factor and their responses. The key findings of the article elucidated that full penetration with optimized aspect ratio could be achieved on employing high frequency pulsing. © 2014 The Authors.