Liquid penetrant testing defects depend on the product form. The liquid penetrant test only can reveal the defects that are open to the surface.
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The liquid penetrant test is performed to detect any crater crack, transverse crack, longitudinal crack (either in weld seam or heat affected zone). This test also reveals surface porosity. The weld undercut, and surface lack of fusion also can be revealed with this test.
The test can detect surface porosities, open shrinkage to the surface and hot tears and cold shuts.
Others
Liquid penetrant testing discontinuities - For Forging
The test can identify and reveal forging laps and bursts.
Liquid penetrant testing discontinuities - For Plate Material
The liquid penetrant test can reveal the plate lamination that opens to the surface and normally detected by applying liquid penetrant test on the plate edges.
Liquid penetrant testing discontinuities - Service Crack
The liquid penetrant test (PT test) can reveal service crack. This crack was not existed on the component and created after the material placed in service and worked for while. The service crack can be the different type of stress corrosion cracking and fatigue cracking.