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MATERIAL - DESIGN STUDY OF BRAZED R.S. 140 TITANIUM SANDWICH FOR B-58
GENERAL DYNAMICS/FORT WORTH TEX
A study was made to evaluate the effects of processing variables and material variables on brazed RS-140 Ti alloy structures. One nacelle and one elevon panel were brazed for installation on B-58 AP 28 for ground test purposes. They were 100 acceptable before and after the complete schedule of testing. The following findings are reported 1 a new, nearly ideal stop-off anti-braze for Ti alloys was developed, 2 the optimum brazing temperature for Dynabraze B was 1650 F, 3 Dynabraze B had no appreciable effect on the tensile strength of 0.010-in.-thick RS140 Ti alloy, but caused a reduction in elongation, 4 material in the cold rolled condition prior to brazing, produced panels with the highest mechanical properties, 5 the faster brazing cycle made possible with Cu, rather than graphite fixturing, resulted in an 8 increase in strength, and the brazing cycle was shortened from 80 to 25 min for a 13- x 25-in. panel, and 6 the composite of RS-140 Ti alloy skins with 17-7 PH stainless steel core was feasible. Author
AF33 657 7248