You select using the frequency must be selected for verification to suit the thickness of the workpiece. The low frequency is suitable for most thickness of the workpiece. High frequency will suit some targets and monitoring by using very high frequency for detecting small defects, what.-When you find something defective in the weld will have to find out the size of that particular fault, which is the most commonly used method is 6dB drop by half of the beams are defective and the other half on things outside what fault, which is determined by the equation log = 20 dB.-In the process of scanning for something defective an inspector must have the resolution and must rely on the expertise which the scanning probe head, staggering to move gradually, both front and rear, right, left, to capture what is clearly defective signal.
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