Phased Array Ultrasonic Testing with Sectorial Scanning
Phased array ultrasonic testing with focused groups is an advanced ultrasonic method that electronically steers and focuses the sound beam by time-controlled excitation of individual crystals in the probe. This enables complete inspection of complex geometries.
Physical-Chemical Mechanism of Action
Phased array ultrasonic testing uses a probe with multiple piezoelectric crystals. By electronically delaying the pulses to these crystals, the sound beam is steered and focused electronically. This allows precise control of the sound path and the detection of flaws or cracks in complex components.
Metallurgical Relevance & Risks in Welding
This method is especially useful for inspecting weld geometries that are hard to reach with traditional ultrasonic techniques. It increases the detection rate and accuracy of flaws and cracks, which improves the safety and reliability of components. However, incorrect use or faulty pulsing can lead to inaccurate results, which can cause defects in the structure.
Workshop Practice & Action Steps
To successfully use phased array ultrasonic testing with focused groups, follow these steps:
1. Calibrate the probe: Make sure the probe is calibrated correctly and the crystals work properly.
2. Set the pulsing: Adjust the timing of the crystal pulses so the sound beam is steered and focused in the desired direction.
3. Perform the inspection: Move the probe over the area to be tested and capture the ultrasonic data.
4. Evaluate the results: Analyze the captured data with specialized software to detect and locate flaws or cracks.