Fusion Welding of Titanium-Tungsten and Titanium-Graphite Composites

摘要

Fusion welding experiments were conducted on two titanium matrix composite systems: Titanium-tungsten wire and titanium-graphite filament. The objectives were to determine the weldability of model composites and to observe the influence of weld thermal energy on fiber-matrix reactions. Results of mechanized and manual gas-tungsten arc welding tests indicated that well diffusion bonded composites generally presented no unusual problems during fusion. The extent of fiber-matrix reactions in both systems was directly proportional to welding energy input. As energy input was increased, tungsten wire dissolution became greater and titanium carbide formation around the graphite filaments grew thicker. Welding energy input thus becomes a significant factor in controlling the nature of fiber-matrix reaction products. Tensile properties of titanium-tungsten composites, both as-diffusion bonded and as-welded, are compared. (Author)