Ultrasonic flaw detector is a precision instrument for testing the quality of equipment. Its accuracy is very important. However, during the measurement process, due to certain factors, the measurement of the ultrasonic flaw detector is often inaccurate, which will cause a lot of Therefore, it is important to understand the reasons that affect the measurement accuracy of ultrasonic flaw detectors.

1. The conductivity of the base metal has an impact on the measurement, which is related to the composition of the base metal material and the heat treatment method;

2. The surface roughness of the base metal and the covering layer affects the accuracy of the measurement, and the increase in roughness will increase the influence.

3. Any kind of instrument requires the base metal to have a critical thickness, only if it is greater than this thickness, the measurement will not be affected by the thickness of the base metal;

4. The flaw detector has an edge effect on the pattern measurement, that is, the measurement near the edge of the pattern or the inner corner is unreliable;

5. The curvature of the sample has an influence on the measurement, and this influence will increase significantly with the decrease of the radius of curvature;

6. When the thickness of the covering layer is greater than 25μm, the error is approximately proportional to the thickness of the covering layer;

The above six points are the six reasons that affect the measurement accuracy of the ultrasonic flaw detector. I hope to help everyone.