Accession Number : AD0430151


Title :   MICROMINIATURE CRYSTAL UNITS CR-(XM-47)/U.


Descriptive Note : Quarterly rept. no. 2, 1 Aug-31 Oct 63,


Corporate Author : GENERAL ELECTRIC CO LYNCHBURG VA


Personal Author(s) : Stoddard,W G


Report Date : 31 Oct 1963


Pagination or Media Count : 26


Abstract : The results of further feasibility tests in parallel-gap and electron-beam welding of Elgiloy springs to molybdenum post and electron-beam sealing of the holder are presented. Part I: Parallel-Gap Welding of Spring to Post. Parallelgap welding, a type of capacitor discharge spot welding, was found to be unsuccessful in welding Elgiloy springs to the molybdenum posts. The molybdenum did not get sufficient heat to melt and mix with the Elgiloy. A poor mechanical joint was formed as the result of the Elgiloy spring melting and forming over the butt of the molybdenum post. Part II: Electron-Beam Welding of Spring to Post. Electron-beam welding of Elgiloy spring to molybdenum post was accomplished successfully. An optimum weld schedule has been derived from these experiments. Part III: ElectronBeam Sealing of Crystals. Crystals mounted in miniature relay holders were electron-beam sealed to find the effects of welding on crystal performance. Where poor fit-up existed between cover and header, excess crystal frequency change was evident. This result stresses the importance of good fit-up between parts before attempting to weld. Application of this technique to the microminiature configuration is described. (Author)


Descriptors :   SUBMINIATURE ELECTRONIC EQUIPMENT , CRYSTAL HOLDERS , SPRINGS , MOLYBDENUM , ELECTRON BEAMS , WELDING , ELECTRIC TERMINALS , JIGS , CONTAINERS , FREQUENCY SHIFT , VOLTAGE , ELECTRIC CURRENT


Distribution Statement : APPROVED FOR PUBLIC RELEASE