MIL-P-29228A(YD)
3.15 Workmanship.
3.15.1 Metal fabrication. Metal used in fabrication shall be free from
kinks, sharp bends, and other conditions which would be deleterious to the
finished product. Manufacturing processes shall not reduce the strength of the
metal to a value less than intended by the design. Manufacturing processes
shall be done neatly and accurately. All bends shall be made by controlled
means to ensure uniformity of size and shape. External surfaces shall be free
from burrs, sharp edges or corners, except when sharp edges or corners are
required by design or where they are not detrimental to safety.
3.15.2 Bolted connections. Bolt holes shall be accurately punched or
drilled and shall have the burrs removed. Washers or lockwashers shall be
provided in accordance with good commercial practice, and all bolts, nuts, and
screws shall be tight.
Rivet holes shall be accurately punched or
3.15.3 Riveted connections
drilled and shall have the burrs removed. Rivets shall be driven with pressure
tools and shall completely fill the holes. Rivet heads, when not countersunk or
flattened, shall be of approved shape and uniform size for the same diameter of
rivet. Rivet heads shall be full, neatly made, concentric with the rivet holes,
and in full contact with the surface of the member.
3.15.4 Welding. Welding procedures shall be in accordance with a nationally
recognized welding code. The surface of parts to be welded shall be free from
rust, scale, paint, grease or other foreign matter. Welds shall be of
sufficient size end shape tO develop the full strength of the parts connected by
the welds. Welds shall transmit stress without permanent deformation or failure
when the parts connected by the weld are subjected to proof and service
loadings.
3.15.5 Castings. All castings shall be sound and free from patching,
misplaced coring, warping, or any other defect which reduces the casting's
ability to perform its intended function.
3.16 Cleaning, treatment, and painting. Surfaces which are to be painted
shall be cleaned, treated, and painted as specified herein. The color of the
finish coat shall be as specified (see 6.2). Surfaces to be painted shall be
cleaned and dried to insure that they are free from contaminants such as oil,
grease, welding slag and spatter, loose mill scale, water, dirt, corrosion
product, or any other contaminating substances. As soon as practicable after
cleaning, and before any corrosion product or other contamination can result,
the surfaces shall be prepared or treated to insure the adhesion of the coating
system. The painting shall consist of at least one coat of primer and one
finish coat of acrylic-based enamel. The primer shall be applied to a clean,
dry surface as soon as practicable after cleaning and treating. Painting shall
be with manufacturer's current materials according to manufacturer's current
processes and the total dry film thickness shall not be less than 2.5 mils over
the entire surface. The paint shall be free from runs, sags, orange peel, or
other defects.
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