In today's video, we will explore two important aspects of the Krautkrämer USM 100: DAC and AWS. These features prove valuable when asset owners need to assess test results for acceptance, maintenance/repair, or rejection.
To create DAC points, it is recommended to employ a probe with a 60-degree angle and select three points at 1/4, 1/2, and 3/4 values on a block complying with ASME Sec V. The block should have a thickness of 19mm and a 2.5mm hole at all positions.
For AWS calibration, a k1 calibration block with a side drill hole diameter of 3 mm is recommended. While calibrating sensitivity, adjust the side drill hole amplitude from an initial 80% to 40%. Subsequently, calibrate AWS to the 40% position by looking at the dB value.
The reason why DAC and AWS are important is because they help in identifying anomalies or defects. In the case of a DAC defect, for example, three curves are generated at 80%, 40%, and 20%. If the pulse value reaches the 80% threshold, automatic rejection occurs. However, if values are at 20% and 40%, standard criteria are applied.
On the other hand, AWS is used to determine the assessment criteria used. There are two types of criteria: static and cyclic, determined by consulting the table. During object inspection, if dB values identify a defect or anomaly, classes A, B, C, and D are determined based on the table's static or cyclic criteria.
12 дек 2023
