Welder Red Seal · Question
A welder is preparing to make a critical weld on a high-strength steel component. During fit-up, they notice a small, linear indication on the surface of the base metal near the intended weld joint. To confirm if this is a surface crack before welding, which NDT method would be the most effective, assuming the material is ferromagnetic?
Magnetic Particle Testing (MT) is highly effective for detecting surface and slightly subsurface discontinuities in ferromagnetic materials. It creates a magnet
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Question: A welder is preparing to make a critical weld on a high-strength steel component. During fit-up, they notice a small, linear indication on the surface of the base metal near the intended weld joint. To confirm if this is a surface crack before welding, which NDT method would be the most effective, assuming the material is ferromagnetic?
Answer options:
- Ultrasonic Testing (UT)
- Liquid Penetrant Testing (PT) ✅ Magnetic Particle Testing (MT)
- Eddy Current Testing (ECT)
Correct answer: Magnetic Particle Testing (MT)
Explanation: Magnetic Particle Testing (MT) is highly effective for detecting surface and slightly subsurface discontinuities in ferromagnetic materials. It creates a magnetic field, and magnetic particles are attracted to flux leakage caused by flaws, making them visible. Liquid Penetrant Testing is also for surface cracks but works on both ferromagnetic and non-ferromagnetic materials.
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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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