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Chapter 8 Flaw Evaluation and Influence Factors
of the Detection Precision
Please read following information before use
PCE-USC 20
ultrasonic flaw detector,
acquaint with and abide by related requirements, it is very important to avoid
wrong flaw detect results caused by misoperation. Illegal operation also possibly
causes personal safety accident or property damage.
8.1 Necessary Condition for Using
(1) Training for the operators.
(2) Knowledge about the requests and limits of the special technical test.
(3) Choose the suitable test devices.
8.2 Training For Operators
Operating ultrasonic inspect facilities requests the operators to receive normal
training about the method of flaw detection. Normal training includes following
contents:
(1) ultrasonic propagation principles;
(2) influence to test materials sound velocity;
(3) sound wave characteristic of different materials interface;
(4) influence from sound attenuation and surface condition to tested materials.
Lack of these knowledge may cause unforeseeable and wrong flaw detect results,
please contact related NDT institutes or our company to obtain information about
operators training and grade examination of qualification certificate.
8.3 Technical Requirements for Detection
Specific technical requirements must be followed in every ultrasonic detection,
and the most important requirements are as follows:
(1) defining the detection range;
(2) choosing the suitable detection methods;
(3) considering the material characteristics;
(4) deciding the ranges of the record and evaluation.
