Phased Array Ultrasonic Testing PDF

Phased Array Ultrasonic Testing DACON INSPECTION SERVICES  Who we are Conventional and Oil and Gas, Refinery, Over 400 personnel Thailand headquarters Advanced NDT and Petrochemical, Heavy including more than with Internatio...

Phased Array Ultrasonic Testing DACON INSPECTION SERVICES  Who we are Conventional and Oil and Gas, Refinery, Over 400 personnel Thailand headquarters Advanced NDT and Petrochemical, Heavy including more than with International Inspection Services Industry, Mining 300 inspectors expertise since 1979 Advanced Ultrasonic Inspection PAUT PAUT = Phased Array Ultrasonic Testing Computerized application of ultrasonics in which high speed electronics, real time imaging. With todays advanced technology, special probes are utilized for inspection. There is no physical difference between conventional UT and PAUT. Both use the same basics and theory The main difference between conventional UT and PAUT is within the probe DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT A mosaic of transducer elements Basically PAUT probe is a conventional probe cut into many elements Elements' excitation can be individually controlled Certain desired effects can be produced by timing the elements excitation  steering the beam axis  focusing the beam. DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT How does it work Elements are acoustically insulated from each other Elements are pulsed in groups with pre calculated time delay for each element Focal law: defines the elements to be fired, time delays, and voltages for both the transmitter and receiver functions. DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Beam Forming No time delay applied PAUT probe becomes like a conventional UT probe DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Beam Steering Provides capability to modify refracted angle Allows for multiple angle inspection using a single probe Applies a linear focal law (delays) DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Beam Steering Provides capability to modify refracted angle Allows for multiple angle inspection using a single probe Applies a linear focal law (delays) DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Beam Focusing and Steering at the same time Provides capability to Focus at a certain depths and at a chosen range of different angles Applies a focal law (delays) as in below figure DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Electronic scanning The ability to move the beam along one axis of an array without any mechanical movement The movement is performed only by time multiplexing the active element group The beam movement depends on the probe geometry and could be:  linear scanning  sectorial scanning  lateral scanning  combination DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Linear electronic scan The beam will move along the length of the probe Can be straight beam or a beam at a fixed angle This type of scan is often used for corrosion mapping applications DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Sectorial scan The ability to scan a complete sector or volume without any probe movement Useful for inspection of complex geometries This is the most typical scan which distinguishes phased array from other techniques DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Applications New construction weld inspection In-service weld inspection including Stress Corrosion Cracking Complex Geometries – Nozzles, Flanges, Shafts, bolts C-Scan mapping AUT is also commonly used, accepted, and code compliant with phased array ultrasonics DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Weld inspection A scan plan to make sure the weld is covered completely is made first The scan plan will assist in setting up equipment and focal laws DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Weld inspection Equipment calibration  Velocity  Wedge delay for all angles  Sensitivity for all angles  Time Corrected Gain (TCG) Weld scanning  Manually  Semi –automated, using an encoder and fixed distance to weld center line  Using a semi-automated or completely automated scanner DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Inspection Results Signal interpretation  On Omni scan  Using Tomo view Interpretation can be preformed in the field “real time” and also reviewed post inspection. Permanent data files can be saved for future resource. Commonly used for monitoring and also Auditing inspection results DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS Advanced Ultrasonic Inspection PAUT Advantages & Disadvantages Advantages Disadvantages Gives information about lateral position of Higher cost equipment required defect in weld (depth and height) Requires experienced and trained Gives a permanent record technician for interpretation Repeatability, good for monitoring Angle of incidence is not always No radiation involved optimal when using S-scan Can be used for several applications Can find defect at surface and in volume of weld (no dead zone) Interpretation simplified DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS How Can We Help? Contact Email : [email protected] Phone : +66 (0) 33 012 484-7 www.dacon-inspection.com DACON INSPECTION SERVICES FOR ALL YOUR INSPECTION NEEDS