What is the typical resolution limit for UT in detecting flaws?

The typical resolution limit for ultrasonic testing (UT) in detecting flaws is primarily influenced by the frequency of the ultrasonic waves used and the properties of the material being tested. When using higher frequencies, the wavelengths are shorter, thereby enhancing the ability to detect smaller flaws. In many cases, UT can effectively detect flaws as small as 1 mm or even down to 0.5 mm in appropriate conditions.

Detecting flaws as small as 0.1 mm is possible with very high-frequency ultrasonic testing but is generally not considered typical for standard industrial applications. This makes the capability to resolve such fine details less common in practical scenarios, where the typical detection resolution is around 1 mm.

As for a limit of 2 mm, it is considerably less sensitive and not representative of the high-resolution capabilities that ultrasonic testing can achieve with modern equipment.