CSWIP 3.1U Practice Questions - CSWIP 3.1U Underwater (NDT) Inspection Diver Exam

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When inspecting a subsea structural tubular weld, what visual appearance distinguishes a fatigue crack from a superficial surface scratch?

A fatigue crack is always perfectly straight and perfectly perpendicular to the water surface. A scratch always exhibits rust staining while a fatigue crack remains shiny steel underwater. A fatigue crack only forms inside internal structural air pockets. A fatigue crack typically follows stress concentrations at the weld toe, showing depth and sharp linear progression, whereas a scratch has rounded mechanical edges.

Correct Answer:

A fatigue crack typically follows stress concentrations at the weld toe, showing depth and sharp linear progression, whereas a scratch has rounded mechanical edges.

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