MIL-HDBK-1890 Inspection of Welded JointsThis handbook gives guidance for nondestructive inspection of welded joints. This handbook is for guidance only. This handbook cannot be cited as a requirement. If it is, the contractor does not have to comply.

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Type of defect

Class 1

Class 2

Class 3

Class 4

Cracks and crack-like indications

u

u

u

u

Incomplete penetration & fusion

u

u

u

u

Surface porosity

Max. size "D" Max total

Min. distance between indications

u u u

T/4 up to 0.060 max.

2 of max. size or equivalent length

4D

T/3 up to 0.060 max.

3 of max. size

3D

T/3 up to 0.100 max.

5 of max. size or equivalent length

2D

undercutting Max. depth Max. length

u u

T/20

10T IN 50T

T/15

10T IN 20T

T/ 10

10T IN 20T