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SANDWICH PANELS, MECHANICAL PROPERTIES, EFFECT OF ELIMINATION OF REFRIGERATION, CYCLE ON
GENERAL DYNAMICS/FORT WORTH TEX
Pagination or Media Count:
An investigation was made to determine whether the -20F step could be eliminated and thus reduce the cost of producing brazed sandwich panels. Tensile, edge compression, shear, and flat compression specimens were cut from each of 3 brazed sandwich panels and prepared in accord-ANCE WITH DRAWING 4FTT110 in the FMS-0036B specification. Two heats of the 0.005-, 0.010-, and 0.025-in.-thick material and one heat of the 0.040- and 0.063-in.-thick material were tested. Both longitudinal and transverse specimens were tested for each heat and thickness of material. Additional tensile specimens were prepared from 2 batches of 0.010- and 0.025-in.thick 17-7PH stainless steel filler sheets heat treated in the production brazing facilities. Three 12- by 13- by 25-in. 17-7PH stainless steel sandwich panels, brazed with sterling Ag plus 0.2 Li alloy were given a standard braze cycle heat treatment but with no -20F transformation step. The elimination of the -20F transformation step from the heat treatment gave tensile test values which varied from heat to heat. The test results did not indicate that the -20F transformation treatment can be discontinued. Author
APPROVED FOR PUBLIC RELEASE