Brazing Beryllium by Capillary Flow
Final rept. 1 Jan 1967-15 Jun 1968
SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
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Six silver-base braze alloys including some high in copper, with a high tolerance for adverse braze conditions, were developed to give maximum capillary flow in unplated beryllium sheet without flux at 1400F to avoid loss of base metal wrought properties. In addition, one titanium-base alloy showed promise for brazing beryllium as low as 1400F. Silver-base alloys were developed and optimized, by selected additions, for brazing in argon, starting from the silver-copper eutectic. The sequence used in the development and evaluation of braze alloys included determination of melt-flow temperatures and flow distance on flat plates of beryllium sheet capillary flow over a vertical distance of one inch for isothermal conditions analysis of braze joint structures and strength of brazed joints. The tolerance of alloys for changes in braze conditions was studied by varying the argon quality and methods of beryllium surface preparation, and by evaluating the practical application of alloys to beryllium honeycomb.
- Metallurgy and Metallography
- Fabrication Metallurgy