INVESTIGATION OF WELDABILITY OF ADDITIONAL COLUMBIUM ALLOYS.
Rept. for July 62-30 June 63,
TRW INC CLEVELAND OHIO
Pagination or Media Count:
The welding characteristics of 4 niobium alloys, FS-85, B-66, D-36 and Cb-752, in two thicknesses were the subject of this investigation. These alloys in sheet form were welded by the tungsten inert gas, electron beam and resistance spot welding processes. The welding variables of current, voltage, speed and environment were studied to determine their effects on weld properties and to correlate properties with weld 4icrostructure. A study of the effect on weld ductility of post weld aging and applying an oxidation protective coating was included in this program. The effect of tungsten arc or electron beam welding these alloys was to increase the ductile to brittle transition temperature. The increase was greatest for B-66 and Cb-752 and least for D-36 and FS-85. Generally, electron beam welds in a given alloy were more ductile and slightly stronger than tungsten arc welds. Aging tungsten arc welds at 1800 and 2000 F caused an additional increase in transition temperatures. Author