OPTIMIZATION OF DISSIMILAR WELDING PROCESSES BETWEEN Ti-4V-6Al TITANIUM ALLOYS WITH SS304 STAINLESS STEEL BY GAS TUNGSTEN ARC WELDING PROCESS

Abstract

This study investigated the ultimate tensile strength (UTS) of dissimilar welding processes between Ti-4V-6Al titanium alloys with SS304 stainless steel by gas tungsten arc welding (GTAW) process. The intermetallic compounds of the welds were investigated by X-ray diffraction, and the Taguchi method was used in the experimental design. The welding process parameters are welding current (A), welding speeds (B), and Wire feeds (C). ANOVA analysed the S/N ratio of ultimate tensile strength to determine the optimal parameters for statistically significant factors. Analyse for process parameters on the response and the level of the indispensability factor, as well as predict and regression model for optimal tensile strength. The investigation revealed that the optimum parameters were A1B2C2, and the ultimate tensile strength was 285MPa. The ANOVA analysis found that welding current and welding speeds had significance on the ultimate tensile strength of the workpiece at a 95% confidence level. The investigation of intermetallic compounds of the welds with X-ray diffraction technical found that increased welding current tended to cause Ti3Cu and Fe4Cu3 compounds and affected the tensile strength of the weld to decrease.