|PAUT for Weld Inspections|
NDE Associates offers the following services for Phased Array inspections
Phased Array for Weld Inspections
Phased Array of Complex Components
Phased Array for Defect Sizing
Phased Array in Lieu of Radiography
Phased array technology offers an attractive option to perform UT in lieu of radiography. This main advantage being that phased array inspection does not interfere with surrounding work. Radiography requires barricading a perimeter during the exposures.
Why use Ultrasonic Phased Arrays ?
Unlike conventional and automated ultrasonic testing, which is performed for fixed angles of 45, 60 and 70 degrees, phased array testing can cover all angles in this range. This is significant as a single phased array inspection can cover all angles from 40 to 75 degrees and displays the image in real time. The real time image is direct superimposition of the ultrasonic illumination on the test piece and is easy to interpret. Using swept angle S-scans, PAUT requires smaller surface distance for inspection compared to AUT or manual UT. PAUT can cover a large cross-section of the test piece from a single probe location. On the contrary, AUT either requires raster scanning or multiple probes placed over a range of surface distance to cover the entire cross-section of the test piece. When properly used, phased arrays can be used on all ultrasonic applications and result in a highly reliable NDT inspection.
Phased Array Tests on Weld flaws
We have tested the capability of phased arrays for detection of defects in weld test samples. These samples include plate and pipe sections. Weld flaws in these samples include toe cracks, center line crack, LOF, LOP, slag and porosity. Tests were conducted using two different systems. Test results showed that both systems successfully detected all the defect types. Defects were definitely easy to detect and interpret with the phased arrays compared to the conventional A-Scan machine proving the reliability of phased arrays for weld inspection. For further reading see "Ultrasonic Phased Arrays for Weld Testing", Paper Copyright by Materials Evaluation, ASNT, Columbus, Ohio.
Phased Array Testing of Butter Welds
Crack sizing with Phased Arrays.
Phased Arrays for Weld Testing",
Paper Copyright by Materials Evaluation, ASNT, Columbus, Ohio.
NDE Associates, Inc.