Ultrasonic Angle Beam Testing
Ultrasonic angle beam testing uses shear waves at an angle to inspect welds and hard-to-reach areas for volumetric flaws. It also detects cracks not perpendicular to the surface.
Physical-Chemical Mechanism of Action
Angle-beam ultrasonic testing uses shear waves that are introduced into the workpiece surface at a fixed angle. These waves reflect off the walls and internal structures of the material. The detectors pick up the returning ultrasonic wave and produce an image showing the location and size of flaws or cracks.
Metallurgical Relevance & Welding Risks
This test is especially important for weld seams and areas with complex geometry where other test methods are not sufficient. It also detects cracks that are not perpendicular to the surface, ensuring full flaw detection. A wrong angle or insufficient ultrasonic energy can lead to inaccurate results and cause potential flaws to be missed.
Workshop Practice & Procedures
Angle-beam ultrasonic testing requires a special ultrasonic device that can emit shear waves and detect reflected waves. The angle of the incoming wave should be set depending on the material and test object (typically between 15° and 45°). The ultrasonic wave must be transmitted with enough energy to scan the entire weld. The results should be carefully interpreted to make sure no flaws are missed.