Accession Number:

AD0272227

Title:

MATERIALS - HONEYCOMB CORE RIBBON RELATIONSHIP BETWEEN FLOW CHARACTERISTICS OF BRAZING ALLOY AND OXIDE FILM FORMATIONS OF - DETERMINATION OF

Descriptive Note:

Corporate Author:

GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s):

Report Date:

1962-01-18

Pagination or Media Count:

1.0

Abstract:

Brazing flow tests were run on 17-7PH .0015 in.thick stainless steel specimens, using the 92.8-7-0.2 Ag-Cu-Li brazing alloy. Spectrophotometric measurements, electron diffraction studies, and ferric chloride etch tests revealed differences in color and reflectance, composition, thickness, physical characteristics, and etching of the surfaces of specimens having a different annealing history. Flow response of 17-7PH foil under conditions of capillarity can be determined by a sandwich flow test. When the material was annealed in a hydrogen atmosphere of very low dew point -85 F, very good alloy flow was obtained upon brazing under capillary conditions of the sandwich flow test. Limited sandwich flow testing of the ultrasonically cleaned specimens gave excellent improvement in brazing response for dew points ranging from -30 to 41 F. AD- 72 2 9 sponse of 17-7PH foil under conditions of capillarity can be determined by a sandwich flow test. When the material was annealed in a hydrogen atmosphere of very low dew point -85 F, very good alloy flow was obtained upon brazing under capillary conditions of the sandwich flow test. Limited sandwich flow testing of the ultrasonically cleaned specimens gave excellent improvement in brazing response for dew points ranging from -30 to 41 F.

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE