An NDT technician is setting up for Ultrasonic Testing (UT) on a complex geometry, specifically inspecting the root area of a T-joint in a thick-walled component. The technician needs to choose a probe that can efficiently detect flaws in this area. Which type of UT probe is generally best suited for inspecting welds and detecting planar flaws like cracks, particularly in complex geometries?

Question: An NDT technician is setting up for Ultrasonic Testing (UT) on a complex geometry, specifically inspecting the root area of a T-joint in a thick-walled component. The technician needs to choose a probe that can efficiently detect flaws in this area. Which type of UT probe is generally best suited for inspecting welds and detecting planar flaws like cracks, particularly in complex geometries?

Answer options: ✅ Angle beam transducer

• Straight beam transducer
• Dual element transducer
• Immersion transducer

Correct answer: Angle beam transducer

Explanation: Angle beam transducers are specifically designed for weld inspection and detecting planar flaws, such as cracks or lack of fusion, that might not be perpendicular to the scanning surface. They transmit sound waves into the material at an angle, allowing the sound to travel through the weld zone at various angles to intersect potential flaws. Straight beam transducers are best for detecting flaws parallel to the surface. Dual element transducers are designed to overcome dead zone issues near the surface, and immersion transducers are used in water bath environments, not specifically for complex geometries like a T-joint root.