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【范围】
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This specification classifies fusion welds according to structural integrity requirements and establishes
inspection methods and acceptance standards for welded tubular assemblies used in aerospace
applications.
1.1 Welding Processes:
The requirements specified herein apply to fusion welding by one of the following processes:
a. Shield metal arc welding (SMAW)
b. Gas tungsten arc welding (GTAW)
c. Gas metal arc welding (GMAW)
d. Plasma arc welding (PAW)
e. Flux cored arc welding (FCAW)
f. Submerged arc welding (SAW)
1.2 Classification:
Each weld shall be classified according to structural integrity requirements and the weld
classification and inspection level shall be noted on the engineering drawing. Welds shall be
classified as follows:
a. Class A: Welds which are fracture or fatigue critical or welds the single failure of which would
cause significant danger to operation personnel or would result in an operational penalty. This
includes, but is not limited to, loss of major components, loss of control, unintentional release,
inability to release armament stores, or failure of weapon installation components.
b. Class B: A welded joint whose failure would reduce the overall reliability of the equipment or
system or preclude the intended functioning or use of equipment.
c. Class C: All welds not classified as Class A or Class B.
1.3 Inspection Level:
Each weld shall be assigned a level of nondestructive inspection consistent with design
requirements. Nondestructive inspection requirements shall be as follows:
a. Level I: Radiographic, fluorescent penetrant and visual or radiographic, magnetic particle, and
visual inspection of all welds on each weldment for conformance to standards specified herein
b. Level II: Fluorescent penetrant or magnetic particle and visual inspection of all welds in each
weldment for conformance to standards specified herein
c. Level III: Radiographic, fluorescent penetrant and visual or radiographic, magnetic particle, and
visual inspection of welds to an AQL of 1.0 per MIL-STD-105 for conformance to the
requirements specified herein. A unit of product shall be a weld of 4 inches in length or
increments thereof
d. Level IV: Visual inspection only of all welds of each weldment for conformance to standards
specified herein
e. Level V: No inspection required
1.4 Assignment of Inspection Level:
Assignment of inspection level by weld class shall be in accordance with Table 1.
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