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|  MIL-S-46777C
3.15.2.3 Aluminum welding. Aluminum welding shall be accommplished by the
gas-metal-arc or the gas-tungsten-arc method or any other method that will provide equivalent
mechanical properties of the filler metal to base metal combinations. When machines are
available, all aluminum welds shall be made by automatic machines. All welds shall be made at
a uniform rate of speed. Complete and uniform penetration and fusion of the metals shall be
obtained on all welds. Aluminum welds may be ground, filed, wire brushed or chipped;
hammered welds shall not be acceptable. Preheating for welding is permissible, providing the
temperature does not exceed 400 F for a total time of 30 minutes. Aluminum weld processes
requiring the use of welding flux shall not be used.
3.15.3 Brazing. Brazing of the aluminum and aluminum alloys shall be performed in
accordance with the ASME code and other nationally recognized and accepted recommended
procedures and standards of the aluminum manufacturing industry.
3.15.4 Bolted connections. Boltholes shall be accurately punched or drilled and shall have
burrs removed. Integral or separate washers or lockwashers shall be provided. Prevailing torque
nuts are perferred in lieu of standard nuts and lockwashers. All capscrews, bolts, washers, and
nuts shall be tight and correctly torqued. All fasteners and washers shall be finished with a
corrosion preventative protective coating (including an eletrodeposited or mechanical plating or
chemical conversion coating).
3.15.4.1 Critical bolted connections. Critical load-carrying bolted connecttions shall, in
addition, be as specified herein. Boltholes shall be reamed as required. All critical junctures and
joints shall be fastened with high-strength bolts with washers and nuts, hex or 12-point type.
Bolts shall conform to IFI Standards 103 and 111, minimum SAE Grade 8, ASTM A449.
Washers shall be of the flat hardened steel type, sized to spread the clamping loads such that
brinnelling or embedding in the components members shall be prevented. Mating nuts shall be
of the prevailing torque type in accordance with IFI Standards 100, 101,107, and 108, minimum
class C, unflanged, or class G flanged. Fasteners shall be lubricated prior to wrenching. To
insure constant and correct torque performance, fastener installation accuracy shall be achieved
by the turn-of-the-fastener method.
3.15.5 Riveted connections. Riveted connections shall be in accordance with SAE J492.
Rivet holes shall be accurately punched or drilled and shall have the burr removed. Rivets shall
completely fill the holes. Rivet heads shall be full, neatly made, concentric with the rivet holes,
and in full contact with the surface of the member.
3.15.6 Castings. Castings shall be sound and free from patching, misplaced coring, warping,
or other defects which might render the casting unsound for its intended use.
3.15.7 Forgings. Forged components shall be in accordance with the Forging Industry
Association Handbook.
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