This method employs high frequency sound pulses that are emitted from a transducer; this sound wave is induced in to the material through a probe which is usually in contact with the material. These sound waves propagate through the material, and are reflected back to the probe when they reach an interface. The reflected waves are transmitted back through the probe and connecting leads to a detector which can be either analogue or digital. The sounds waves are then displayed as a series of signals on a monitor and the qualified inspector can measure, and interpret these signals to allow accurate evaluation of the internal structure of the material.
In the PCN certification scheme Ultrasonic Testing is separated into three specific product sectors for certification purposes, these are
* Welds
* Wrought Products (Forgings)
* Castings
The welds sector is further sub divided
into groups, these are
* Plate Butt Welds
* Pipe Butt Welds
* Constructional “T” Joint
* Nozzles
* Nodes
Ultrasonic Testing Welds (Node) - Level II
General Theory:
- Principles of Ultrasonic Testing
- Equipment
- Testing techniques
- Calibration of testing systems
Sector Specific Theory:
- Detectability of defects
- Factors affecting the performance of the Ultrasonic test
- Codes of practice and standards
- Conducting and recording the test
- Interpretation of test results
- Product technology theory