Welder Red Seal · Question
A maintenance welder is tasked with inspecting a critical load-bearing steel structure that has been in service for 15 years. Visual inspection reveals no surface flaws. Which NDT method would be most effective for detecting subsurface cracks or inclusions within the weld metal without destroying the component?
Radiographic Testing (RT) uses X-rays or gamma rays to produce an image of the internal structure of the weld, making it highly effective for detecting subsurfa
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Question: A maintenance welder is tasked with inspecting a critical load-bearing steel structure that has been in service for 15 years. Visual inspection reveals no surface flaws. Which NDT method would be most effective for detecting subsurface cracks or inclusions within the weld metal without destroying the component?
Answer options:
- Magnetic Particle Testing (MT)
- Liquid Penetrant Testing (PT) ✅ Radiographic Testing (RT)
- Visual Testing (VT)
Correct answer: Radiographic Testing (RT)
Explanation: Radiographic Testing (RT) uses X-rays or gamma rays to produce an image of the internal structure of the weld, making it highly effective for detecting subsurface cracks, porosity, and inclusions. MT and PT are effective for surface and near-surface defects, while VT is limited to surface observations.
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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
- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
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