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

The primary purpose of reference blocks in ultrasonic testing is to obtain a common reproducible signal. Reference blocks are typically made from a known material and have specific geometries that allow testers to establish baseline data against which test results can be compared. By utilizing these reference blocks, technicians can ensure that the signals received during tests are consistent and comparable across different inspections and equipment setups. This reproducibility is crucial in maintaining the reliability and accuracy of the ultrasonic testing process, enabling the detection of flaws in a consistent manner.

While back reflections, sensitivity, and calibration are all important aspects of ultrasonic testing, the reference block specifically serves as a yardstick for comparison, ensuring that all measurements taken are standardized. This helps in identifying anomalies and verifying the integrity of materials effectively.