What are the specified angles used in angle beam search units? (pitch and catch technique)

What are the specified angles used in angle beam search units? (pitch and catch technique)

• A. 70°, 60° and 45°
• B. 60°, 45° and 30°
• C. 90°, 60° and 30°
• D. 50°, 40° and 30°

Answer: (A)

In angle beam testing with pitch and catch, the search units use fixed wedge angles so the ultrasonic beam travels through the weld at specific, useful directions. The three standard angles commonly stocked for angle-beam search units are 70°, 60°, and 45°. Using these angles lets you probe defects that could lie in different orientations within the weld, since each angle steers the beam along a path that intersects potential planar flaws from particular directions. In a pitch-and-catch setup, one transducer sends at one of these angles and the other receives along the corresponding path, giving good sensitivity across a range of defect orientations. These angles are widely used because they provide effective coverage for typical weld geometries in steel and align with common inspection practices; other angle combinations aren’t standard for the common angle-beam search units.

In angle beam testing with pitch and catch, the search units use fixed wedge angles so the ultrasonic beam travels through the weld at specific, useful directions. The three standard angles commonly stocked for angle-beam search units are 70°, 60°, and 45°. Using these angles lets you probe defects that could lie in different orientations within the weld, since each angle steers the beam along a path that intersects potential planar flaws from particular directions. In a pitch-and-catch setup, one transducer sends at one of these angles and the other receives along the corresponding path, giving good sensitivity across a range of defect orientations. These angles are widely used because they provide effective coverage for typical weld geometries in steel and align with common inspection practices; other angle combinations aren’t standard for the common angle-beam search units.