Overlay Welding on Titanium and 304 Stainless Steel Using ERNiCu-7 Filler Metal by GTAW Process

摘要

This study presents the result of single pass overlay welding of the ERNiCu-7 filler metal on the commercial pure titanium grade 2 and the 304 stainless steel using the gas tungsten arc welding (GTAW) process. The ERNiCu-7 filler metal was overlay welded on the base metals by varying welding currents, which were 30 A, 40 A and 50 A for the CP-Ti base metal and 50 A, 60 A and 70 A for the 304SS base metal. The experimental results indicated that the overlay CP-Ti welded-specimen with accumulating welding current increased bead width and decreased depth of penetration of weldment, while the 304SS welded-specimen with accumulating welding current increased both bead width and depth of penetration. Suitable heat inputs to achieve good geometry of weldment for overlay welding were 348 J/mm for CP-Ti welded-specimen and 558 J/mm for 304SS welded-specimen.