MIL-DTL-62749A
3.13.4.2.1 Steel welding. Where appropriate, welding shall be carried out to welding
procedures which conform to AWS D1.1.
3.13.4.2.2 Aluminum welding. When welding Aluminum Alloy, the metal temperature
of aluminum members to be welded shall not be less than +5°C. Aluminum-magnesium alloys
containing 4.0 to 5.5% magnesium, such as 5083, 5086, and 5456 should not be preheated to
more than 93°C prior to welding. For other wrought aluminum alloys, preheating temperature
should not exceed 149°C. Welds may be ground, filed, buffed or chipper and shall be free from
unacceptable discontinuities, in accordance with the relevant specifications. Welding procedures
shall be established on samples simulating actual material to be welded. The welding procedures
shall include shielding minimum, manual per automatic travel speed, base material, preheat
temperature, thickness, heat treated condition, joint preparation, position, and electrode. All
welding of aluminum alloy components shall be in accordance with the required specification.
Welds must be deposited by the metal inert gas (MIG) welding process, using shaved electrode
wire conforming to AWS A5.10, classification ER 4043. In all other respects welding shall
conform to AWS D1.2.
3.13.4.2.3 Welding fixtures. Shop fabricated components (except for minor parts) shall
be assembled in fixtures or frames and welded while held securely in position. Minor parts may
be held together by means that will insure secure and proper positioning. The fixtures or frames
shall be designed to minimize distortion of the parts being welded.
3.13.5 Machine work. Tolerances and gages for metal fits shall conform to the limits
specified herein, and on the applicable drawings as shown.
4. VERIFICATION
4.1 Classification of inspections. Inspections shall be classified as follows:
a. First article inspection (see 4.2).
b. Quality conformance inspection (see 4.3).
4.2 First article inspection.
4.2.1 First article examination. If specified (see 6.2) one first article component, will be
selected at random by the Government from the first batch of each type fully competitive
component produced from production tooling and will be examined as specified in 4.5.1.
Presence of one or more defects shall be cause for rejection.
4.2.2 First article tests. If specified (see 6.2) each first article fully competitive
component shall be tested as specified in 4.5.2. Failure of any test shall be cause for rejection.
In addition to any test specified as part of the first article test, the Government reserves the right
to conduct any and all other tests contained in this specification as part of the first article tests
and failure of such additional tests shall have the same effect as failure of those tests specified as
first article tests.
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