Ultrasonic Phased Array Sectorial Scan Technique
Ultrasonic phased array sector sweep technique uses electronically controlled transducer elements to quickly vary the sound entry angle and inspect complex weld geometries without gaps.
Physical-Chemical Mechanism of Action
The technique uses multiple transducer elements that are controlled electronically by phase. By shifting the phase of the ultrasonic waves, they can be emitted in different directions without mechanically moving the transducer. This allows precise control of the angle of incidence and enables inspection of complex geometries.
Metallurgical Relevance & Risks in Welding
This technique is especially useful for inspecting weld geometries that are hard to reach with traditional ultrasonic testing. It increases detection rate and accuracy for flaws or cracks. However, incorrect use can lead to inaccurate results if the phase shift is not set properly.
Workshop Practice & Action Guidelines
To use the technique effectively, the transducer elements must be correctly phase-controlled. Settings depend on the specific weld geometry and material. Phase shift adjustments in seconds or degrees are necessary to achieve the desired angle of incidence. It's important to calibrate and verify the technique regularly to ensure accuracy.