MIL-HDBK-660B
FIGURE 29. Modification of standard UG-406 A/U choke flange for use with standard RG-95/U heavywall aluminum waveguide.
5.4 Cleaning. Prior to brazing, cleaning is required to remove surface contaminants, such as grease, oil, oxide film, dust, and metal particles from the filler and the parts to be brazed. Best business practices should be used.
5.5 Attachment of flanges. The parts to be assembled should be thoroughly clean. Avoid the use of emery paper or crocus cloth to clean contact surface of the guide and the flange. Best business practices should be used. The flanges are then torch-brazed, silver-soldered, or dip brazed. A contact flange should not be used as a cover flange
in a choke coupling; see MIL-DTL-3970 for the correct mating cover flange. Alignment of the waveguide and flange is important to minimize mismatch and reflection losses.
5.5.1 Assembly of contact or cover flange to waveguide. When installing contact or cover flanges to a waveguide, the following method should be used:
a. The surfaces to be brazed must be thoroughly clean (see 5.4).
b. For brazing brass flange to brass waveguide, apply silver solder flux over the surface areas to be joined (Handy and Harmon, or equal, flux thinned with water to the consistency of paste, free from lumps or type B brazing flux conforming to O-F-499). For brazing aluminum flange to aluminum waveguide, a flux that will produce maximum flow of filler metal is Alcoa No. 33, or equivalent.
WARNING: THE FLUX IS POISONOUS. AVOID INHALING.
c. Slide contact or cover flange over the guide to extend beyond the flat of the flange, allowing approximately
.031 inch (0.79 mm) of waveguide to extend beyond the flat of the flange on all sides. See figure 30 for attachment of through flange on waveguide.
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