Sending ultrasonic waves through an item or substance is what non-destructive testing refers to as ultrasonic testing, which is a subset of ultrasonic testing known as ultrasonic testing (UT). 

These sound waves with a high frequency are sent into materials in order to characterize the substance or to find flaws in the material. 

Short pulse waves with frequency ranging from 0.1 to 15 MHz are utilized in the vast majority of Ultrasonic Cracks Tester frequencies of up to 50 MHz are also viable options.
Ultrasonic crack testing is a widely used NDT method due to its ability to detect and analyze cracks, voids, and other types of defects that may be invisible to the naked eye. This method can detect defects that are located deep within the material, making it ideal for inspecting critical components such as turbine blades, pressure vessels, and pipelines.

One advantage of ultrasonic testing is that it is non-destructive, meaning that the material being tested is not damaged or altered in any way during the inspection process. This makes it a useful technique for inspecting components that cannot be easily replaced or repaired.

Another advantage of ultrasonic testing is its high accuracy and precision. The method can detect defects as small as a few microns, allowing for early detection and prevention of potential failures. Additionally, modern ultrasonic testing equipment is highly automated, reducing the risk of human error and increasing the efficiency of the testing process.

Ultrasonic crack testing is also a relatively quick and inexpensive method compared to other NDT techniques, making it a popular choice for routine inspections and quality control checks.

In summary, ultrasonic crack testing is a non-destructive, accurate, and precise method for detecting and analyzing defects in materials. Its versatility, speed, and cost-effectiveness make it a valuable tool in a wide range of industries.