Ultrasonic Testing Level 2 (Plates & Pipes) Constantia Kloof

What is Ultrasonic Testing?

Ultrasonic Testing (UT) is a non-destructive testing (NDT) method that uses high-frequency sound waves (ultrasonic waves, typically 0.5–25 MHz) to detect internal flaws, measure material thickness, or evaluate material properties in objects without causing damage.

How It Works:

1. Sound Wave Generation: A piezoelectric transducer (probe) converts electrical energy into ultrasonic waves, which are pulsed into the material.
2. Wave Propagation: The waves travel through the material until they encounter:
   • An interface (e.g., a defect like a crack, void, or inclusion).
   • The opposite surface (back wall).
3. Echo Reflection: Part of the wave reflects back to the transducer as an echo.
4. Signal Analysis: The transducer receives the echo, converts it to an electrical signal, and displays it on a screen (A-scan, B-scan, or C-scan). Key data includes:
   • Time of flight: Time between pulse and echo → determines depth/location.
   • Amplitude: Strength of echo → indicates defect size or type.

Applications:

• Weld inspection (pipelines, pressure vessels).
• Corrosion mapping (thickness measurement in tanks, pipes).
• Aerospace (composite delamination, bond testing).
• Railroad (wheel/axle crack detection).

Advantages:

• Highly sensitive to small defects.
• Portable and real-time results.
• No radiation (unlike radiography).

Limitations:

• Requires skilled operators.