Ultrasonic Thickness Testing
|Publication Date:||1 March 2001|
To provide general instructions for accomplishing ultrasonic thickness measurements. Measurements can be made from one side of a material when access to the opposite side is restricted.
This recommended practice is intended for, but not limited to use at maintenance and overhaul facilities to inspect aerospace structures and hardware for material loss or remaining thickness after rework or fabrication processes. Due to the number of variables which can affect the reliability of ultrasonic thickness measurements, it is only recommended for use when mechanical methods of measurement are not practical.
Written Procedure Requirements:
Ultrasonic thickness tests shall be done in accordance with this procedure or a detailed written procedure specific to the component being inspected. Because of the number of variables, when measurement of the same component is to be conducted on a routine basis, a detailed procedure is recommended.
Procedures shall comply with the general requirements of this document and shall provide any additional specific information required to set up and calibrate the equipment and perform the tests.
Each procedure shall be verified and approved by a certified ultrasonic Level III personnel.
Each procedure shall include not less than the following information:
A specific description of the area to be checked, the material type, nominal thickness and acceptance criteria.
The required instrument, transducer, fixturing, reference standard, and couplant.