MIL-A-21180 Aluminum-Alloy Castings, High Strength \(S/S By Sae-Ams-A-21180\)

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13

MIL-A-21180D

3.6.1 Method of identification. Identification markings shall be raised numerals or letters

when specified on the casting drawing and in the location noted.

3.6.2 Alternate method of identification. Identification shall be by marking with indelible

ink, or tagging when no method is specified on the drawing, or when it is impractical to provide

raised letters or numerals.

3.7 Casting dimensions. The dimensions of the castings shall be within the dimensions and

tolerances specified on the applicable drawings.

3.8 Workmanship. Castings shall be uniform in quality and condition, sound, clean, and

substantially free from foreign materials.

3.8.1 Weld repair of castings. Castings may be weld repaired only upon written permission

of the purchaser. The granting of such permission requires that the facility performing repairs

demonstrate that repaired castings will meet all applicable quality requirements of this

specification. Further, weld procedures for repair and welder qualifications shall be acceptable to

the purchaser. In any repaired casting, repaired areas shall conform to all quality requirements

specified for that area on the drawing or in other acquisition documents. Repaired castings shall

be subjected to the same inspections and meet the same acceptance criteria as a casting which is

sound in the same areas. Such areas shall be identified to facilitate inspection. Repairs shall be

made prior to final solution heat treatment and inspections specified herein, and prior to any

surface finishing treatment (see 6.5 for precautions for welding A357.0 alloy).

3.8.2 Straightening of castings. Castings shall not be mechanically straightened after artifical

aging treatment without written permission from the purchaser.

3.8.3 Prevention of leaks. Castings shall not be impregnated, chemically treated, or coated

to prevent leaking, unless specified by the purchaser. Impregnated castings shall be marked IMP.

3.8.4 Radiographic quality. Radiographic standards shall be as specified on the drawing or

purchase order in accordance with 3.4.2.1.

3.8.5 Surface quality. Castings shall not contain surface cracks, cold shuts, or foreign

material adhering to or embedded in the surface, when inspected in accordance with 4.5.3.

Surface projections, such as those remaining after removal of gates and risers, shall not rise higher

than limits specified in drawings or in other acquisition documents (see 6.2.1).

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 as specified

herein. Except as otherwise specified in the contract or purchase order, the contractor may use