The use of 50Mo-50Re foil materials (<.010" thickness) as heat shielding and in structural support applications for the microwave tube industry are well documented. A common fabrication and processing method for components and assemblies is resistance spot welding (RSW). There are many parameters employed in the welding processing: weld current, weld time, electrode force, hold time, squeeze time, electrode material, electrode geometry, electric polarity, surface roughness, cover gas, et al. In this study, an attempt is made to improve the RSW quality of 50Mo-50Re refractory foils and to understand the typical characteristics of RSW 50Mo-50Re alloys used in high power cathode assembly applications. Pairs of 50Mo-50Re samples with a lap-shear geometry were welded using a Unitek Model DC25 linear DC resistance welder. Tensile-shear tests of the welded samples were conducted on a Instron Series IX Testing System with a 0.2 mm/min tension rate at room temperature. Peak load measured was regarded as the strength of the weldment and was obtained from the average value of several samples. The characteristics of the welds were examined by optical microscopy and SEM. EDS was used to look at the chemical makeup of some weld areas.