MIL-HDBK-1890(AT)
4. INSPECTIONS
4.1 General. This handbook covers the nondestructive inspection of welded joints.
4.2 Inspection sequence and methods. Inspection of welded joints should be done at a
point where the entire joint is accessible for examination. It may be performed at the subassembly or assembly level.
4.2.1 Visual inspection. All welded joints should be visually examined to determine conformance to the acceptance criteria. Parts requiring heat treatment should be examined before and after performing this operation.
4.2.2 Fluorescent penetrant inspection. All welded joints in non-magnetic materials and materials welded with non-magnetic filler material should be fluorescent penetrant inspected in accordance with MIL-STD-6866 to determine conformance to the acceptance criteria. Should the parts require heat treatment, the inspection should be immediately after that operation.
4.2.3 Magnetic particle inspection. All welded joints in magnetic materials and materials welded with magnetic filler material, should be magnetic particle inspected in accordance with ASTM E1444 to determine conformance to the acceptance criteria. At completion of inspection the parts assemblies should be de-magnetized. Should the parts require heat treatment, the inspection should be immediately after that operation.
4.2.4 Radiographic and ultrasonic inspection. Unless otherwise specified on the engineering drawing, all welded joints should be radiographically or ultrasonically inspected. Radiographic inspection is detailed in MIL-STD-453. Ultrasonic inspection procedures are detailed in various industry standards based on the material being welded and the type of weld.
4.2.4.1 Frequency of inspection. Frequency of inspection should be based on weld joint classification as follows (see 1.4):
a. Class 1 weld joints. All Class 1 welded joints should be radiographically or ultrasonically inspected.
b. Class 2 weld joints. All class 2 weld joints should be radiographically or ultrasonically inspected until the quality level satisfactory to the acquisition agency has been established. At that point a sampling plan may be instituted by the acquisition activity.
c. Class 3 weld joints. All class 3 weld joints should be radiographically or ultrasonically inspected until the quality level satisfactory to the acquisition agency has been established. At that point a sampling plan may be instituted by the acquisition activity on the arc and oxyfuel gas welding processes.
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