Welder Red Seal · Question
An NDT technician is examining a stainless steel weldment for surface-breaking discontinuities. The component's surface is smooth and clean. Which NDT method would be the most suitable choice if the technician is looking for very fine surface cracks that might not be visible to the naked eye?
Liquid Penetrant Testing (PT) is highly effective for detecting fine surface-breaking discontinuities on non-porous materials, including stainless steel, by dra
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Question: An NDT technician is examining a stainless steel weldment for surface-breaking discontinuities. The component's surface is smooth and clean. Which NDT method would be the most suitable choice if the technician is looking for very fine surface cracks that might not be visible to the naked eye?
Answer options:
- Ultrasonic Testing (UT)
- Magnetic Particle Testing (MT) ✅ Liquid Penetrant Testing (PT)
- Eddy Current Testing (ECT)
Correct answer: Liquid Penetrant Testing (PT)
Explanation: Liquid Penetrant Testing (PT) is highly effective for detecting fine surface-breaking discontinuities on non-porous materials, including stainless steel, by drawing a penetrant into the flaw and then applying a developer to draw it out. MT is limited to ferromagnetic materials, UT is better for subsurface, and ECT is typically used for conductive materials to detect surface and near-surface flaws, but PT is often preferred for open surface cracks.
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Question explanations
- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
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