What is the primary purpose of using reference blocks in ultrasonic testing?

The primary purpose of using reference blocks in ultrasonic testing is to simulate expected discontinuities. Reference blocks are precisely manufactured samples that contain known flaws or discontinuities, such as inclusions or voids, which are utilized to establish performance baselines for ultrasonic testing equipment. By using these blocks, technicians can verify that their testing equipment is functioning correctly and that the ultrasonic signals it produces will reliably detect similar flaws in test materials under inspection.

This standardization allows for better comparison of test results, ensuring that any flaws or discontinuities identified during inspections can be accurately characterized in terms of size and type. Reference blocks serve as a crucial element in the calibration and evaluation of ultrasonic testing systems, enabling quality assurance in inspections by providing a consistent reference for detecting naturally occurring defects in materials.