Statistical Approach To the Corrosion Behavior of Dissimilar Welds of A387-Gr91/Aisi316 Steels With Pcgtaw Process

In this study, an attempt has been made to minimize the corrosion rate and maximize the pitting potential of dissimilar metal welded joints of a387-gr91/aisi316 steels. the process parameters of the pulsed current gas tungsten arc welding (pcgtaw) including the peak current (p), background current (b), pulse frequency (f), and on time percentage (o) were chosen as the factors influencing the corrosion behavior. design of experiments (doe) was done using taguchi’s l9 (34) orthogonal array. the signal to noise (s/n) ratio analysis indicated that corrosion rate was affected by the peak current, frequency, on time percentage, and background current, whereas the pitting potential was mostly influenced by on time percentage, peak current, frequency, and background current, respectively. optimum conditions of p, b, f, and o factors were found as 135a, 75a, 10hz, 80% for corrosion rate and 120a, 60a, 6hz, 60% for the pitting potential, respectively. furthermore, analysis of variance (anova) demonstrated that the contribution of p, b, f, and o was 28.79%, 13.06%, 28.63%, and 29.51% for corrosion rate and 13.97%, 2.79%, 12.20%, and 71.04% for the pitting potential, respectively. results of the welded samples at optimum conditions showed good agreement with the predicted values for corrosion rate and the pitting potential.