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|  MIL-M-53077(ME)
components and scheduled checks and services are not included. The maintenance schedule shall
be established prior to the start of any testing. Repair of blast damage is not included in the
maintenance ratio.
3.16 Workmanship. Each mounting kit component shall be clean and free from sand, dirt,
fins, pits, scale, corrosion, burrs, sharp edges, cracks, poor welds or welds not meeting drawing
requirements, or any other defects that could impair the function of the mounting kit.
3.16.1 Metal fabrication. Metal used in fabrication shall be free of kinks and sharp bends.
The straightening of material shall be done by methods that will not damage the material. Corners
shall be square and true. All bends shall be made with controlled means to ensure uniformity of
size and shape. Precaution shall be taken to avoid overheating. Heated aluminum shall be
allowed to cool by natural convection. External surfaces shall be free from burrs, sharp edges,
and corners, except when sharp edges or corners are required or where they are not detrimental to
safety.
3.16.2 Welding. The surface of parts to be welded shall be free from rust, corrosion, scale,
paint, and grease, and from mill scale that can be removed by chipping and wire brushing, as well
as from other foreign matter. Welds shall withstand stress without permanent deformation or
failure when the parts connected by the welds are subjected to proof and service loading. Parts to
be joined by fillet welds shall be brought into as close contact as possible, and in no event shall be
separated by more than 3/16 inch unless appropriate bridging techniques are used. The welding
process used in fabrication of the mounting kit shall be as specified in applicable drawings. No
deviations from these requirements are permissible without prior approval from the Government.
3.16.2.1 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 one of the following listed codes for the type of
welding operations 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 make only horizontal welds need not qualify for "all position welding."
Certification shall be made available for review, upon request, by the contracting officer or
designated representative. The Government reserves the right to require the recertification of any
welder or welding operator.
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