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MIL-STD-1947 1985 Edition, May 15, 1985
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Includes all amendments and changes through Cancellation Notice 1, December 5, 1995
Additional Comments: CNCL NO S/S
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This standard established the requirements and procedures for joining assemblies by the ultrasonic welding process for the following types of aluminum sheets and classes of weld joint classification:

Two types of aluminum sheet shall be covered:
     Type I - Alclad Sheet
     Type II - Non-Clad or Bare Sheet

Three classes of welded joints will be treated:
Class A - A welded joint, whose failure during any operating condition would
          cause loss of the equipment or system or one of its major
          components, loss of control, unintentional release or inability to
          release any armament store, failure of gun installation components;
          or which may cause significant injury to occupants of manned

Class B - A welded joint whose failure would reduce the overall
          strength of the equipment or system or preclude the intended
          functioning or use of equipment.

Class C - A welded joint which is considered non-critical and for
          which no stress analysis is considered.

The class of joint used in a welded assembly will be called out on engineering drawings.