|Principles ||A phased array probe consists of individual ultrasonic transducers that can be pulsed individually. By varying the timing, a pattern of interference is set up that results in a beam at a controllable angle. The beam can be â€œsteeredâ€ electronically and swept like a searchlight through the object being examined. Electronic focusing permits optimizing the beam shape and size at the location of the defect. Data from multiple beams can be put together to make a visual image showing a slice through the object.|
|How is it used and for what purpose?||Weld inspection, crack detection and sizing, corrosion mapping, tank floor mapping|
aerospace, power generation, petrochemical, metal billets, tubular goods, pipeline construction and maintenance, structural metals and general manufacturing.
|Applicable Codes and Standards||ASNT requirements for phased array technicians|
API requirements QUTE and QUPA
|Form of report||A, B, C or S Scan images are available|
B Scan represents a cross sectional slice, with information on the depth and orientation of defects
C Scan provides a top view, with location of observed defects
|Advantages||Phased array's multiple and varied beam angles allow for greater coverage and more accurate image than conventional UT, especially complex geometries|
Offers speed, flexibility, data storage, imaging.
Ability to test welds at multiple angles greatly increases the probability of detection of anomalies
Phased array in lieu of radiography eliminates the radiation exclusion zones and requires fewer technicians
Acurenâ€™s Phased Array techniques permit testing on materials up to 600F
Portable phased array ultrasonic equipment is highly computerized and can be operated in manual, semi-automated, or fully automated modes.
|Limitations||Higher initial equipment and probe costs|
Higher technician training requirement
Proper equipment set-up and calibration critical to results
|Rope access applicable? ||Yes|