THE SOLDERING OF BERYLLIUM METAL

The solder compositions, fluxes, and procedures required for Be metal were established and are reported. Surface preparation includes degreasing, acid etching and thorough rinsing. Solder compositions studied contained various percentages of Ag, Pb, Sn, Zn, and In. Flowability was found to be greatest with alloys containing high Zn, In, or Pb and was very sensitive to temperature. Wetting, not as greatly affected by varying temperature, was highest for high Zn and high Pb solder's. Joint strengths varied from 400 to over 3000 psi for most solders. However, the high Zn solders produced shear strengths above 10000 psi, approaching the strengths reported for brazed joints. (P.C.H.)