Welder Red Seal · Question
During a final visual inspection of a heavy-wall pressure vessel, the inspector plans to check for surface cracks. Which of the following NDT methods would be the most suitable for detecting very fine, tightly closed surface discontinuities in both ferrous and non-ferrous materials?
Liquid Penetrant Testing (LPT) is an excellent method for detecting surface-breaking discontinuities in both ferrous and non-ferrous materials. It works by draw
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Question: During a final visual inspection of a heavy-wall pressure vessel, the inspector plans to check for surface cracks. Which of the following NDT methods would be the most suitable for detecting very fine, tightly closed surface discontinuities in both ferrous and non-ferrous materials?
Answer options: ✅ Liquid Penetrant Testing (LPT)
- Magnetic Particle Testing (MPT)
- Radiographic Testing (RT)
- Ultrasonic Testing (UT)
Correct answer: Liquid Penetrant Testing (LPT)
Explanation: Liquid Penetrant Testing (LPT) is an excellent method for detecting surface-breaking discontinuities in both ferrous and non-ferrous materials. It works by drawing a penetrant into the flaw, which is then made visible by a developer. Magnetic Particle Testing (MPT) is effective only on ferromagnetic materials. Radiographic Testing (RT) and Ultrasonic Testing (UT) are primarily used for detecting internal flaws, although UT can find surface flaws under certain conditions.
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- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
- A structural steel fabricator is using FCAW-S (E71T-8 wire) to weld heavy sections of structural steel in an o
- When performing FCAW-G (gas-shielded flux-cored arc welding), a welder notices the arc is unstable and the wir
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