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MIL-T-46786B
character shall be made with precise, unyielding dies or jig fixtures to ensure
uniformity of size and shape.
3.12.3.2 Plastic.  The plastic used in the fabrication of fuel tanks shall
provide original quality surface finish and shall be free from pits, scratches,
scars, and mold imperfections.  Plastic material that has been warped out of
shape by overheating, mishandling, or incorrect storage is not acceptable. The
forming of the plastic material shall be done uniformly, neatly, and
accurately.  Bonding of plastic to metal or plastic to plastic parts shall be
done b methods that will not cause damage to the material.  The bonded areas
shall be free from adhesive runs, pits, gaps, cracks, blisters, wrinkles, air
or gas pockets, porosity, or other defects.  Sharp edges, mold flash, or
overfill shall be removed.
3.12.4 Welders and welding.
3.12.4.1 Welders.  Before assigning any welder or welding operator to
welding work covered by this specification, the contractor shall obtain
certification that the welder or welding  operator has passed qualification
tests as prescribed by either of the following listed codes for the materials
joined and the type of welding operation to be performed and that such
qualification is effective as defined by the particular code:
AWS D1.1, Structural Welding Code - Steel.
AWS D1.2, Structural Welding Code - Aluminum.
ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing
Qualifications.
Contractors who only make horizontal welds need
not qualify welders for "all
position welding."  In the event of evidence of
poor welds, the Government
reserves the right to require retesting of any
welder or welding operator. The
test results shall be made available for review
by the contracting officer or
the contracting officer's representative.
3.12.4.2 Welding.  The surfaces of parts to be welded shall be free from
rust, scale, paint, grease, and other foreign matter.  Welds shall transmit
stress without permanent deformation of failure when the parts connected by the
welds are subject to proof and service loading.
3.12.4.3 Aluminum welding.  Aluminum welding shall be accomplished by the
metal-inert-gas 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. The
welding of aluminum shall be performed in accordance with nationally recognized
and accepted recommended procedures of the aluminum industry.
4.
QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection.  Unless otherwise specified in the
contract or purchase order, the contractor is responsible for the performance
of all inspection requirements (examinations and tests) as specified herein.
Except as otherwise specified in the contract or purchase order, the contractor
may use his own or any other facilities suitable for the performance of the
inspection requirements specified herein, unless disapproved by the Government.
13

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