MIL-HDBK-660B
d. The bore of the flange should be concentric with the waveguide bore to within .005 inch (0.13 mm) (see figure 31).
5.5.3 Clamps and jigs. (See figures 35 and 36).
5.6 Silver brazing brass waveguide. Brass waveguide assemblies should be brazed with a silver base alloy in accordance with QQ-B-654, grade IV or VI. After the parts to be brazed are properly clamped and fluxed, start preheating. A soft brush type flame (torch tip No. 6) should be used. Spread the flames of the air-acetylene torch as large as possible for heating evenly. However, if oxyacetylene is used, there should be a sharply defined inner cone. Exercise extreme care in handling the waveguide while soldering to prevent buckling.
CAUTION: DO NOT USE SOLDER ON THE FACE OF THE FLANGE. SOFT SOLDER OXIDIZES WITH AGE AND MAY CAUSE A HIGH RESISTANCE JOINT.
WARNING: CONTAINS CADMIUM. BRAZING HEAT CAN PRODUCE TOXIC
FUMES. USE BEST BUSINESS PRACTICES FOR PROPER VENTILATION AND HEALTH ISSUES.
Apply heat to the flat surface of the flange as shown in figures 37 and 38. If oxyacetylene is used, the flame must be applied with the inner cone a few inches off the work. Heat the assembly sufficiently to melt the silver solder. Apply the silver solder to the surfaces to be brazed (refer to figures 36 and 37). For a good joint, the liquefied solder must flow thoroughly and evenly between the guide and flange. Maintain adequate heat to melt the silver solder without applying the torch to the joint or solder. Insufficient heat results in a weak joint and overheating burns the flux, warps the flange and causes oxidation. The guide and flange should be cooled in air without the use of forced
cooling. Very carefully grind, file, or sandpaper flat flange and waveguide ends to a smooth surface approximately 63 microinches root mean square (rms).
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