Ultrasonic inspection of Plate, Rod and Welds
UT - Ultrasonic Testing
Ultrasonic nondestructive testing, also known as ultrasonic NDT or simply UT, is a method of characterizing the thickness or internal structure of a test piece through the use of high frequency sound waves. The frequencies, or pitch, used for ultrasonic testing are many times higher than the limit of human hearing, most commonly in the range from 500 KHz to 20 MHz.
Phased array UT - PAUT is used in wide range of applications,
UT Weld Inspection
The most commonly occurring defects in welded joints are porosity, slag inclusions, lack of side-wall fusion, lack of inter-run fusion, lack of root penetration, undercutting, and longitudinal or transverse cracks.
With the exception of single gas pores all the defects listed are usually well detectable by ultrasonics. Most applications are on low-alloy construction quality steels, however, welds in aluminum can also be tested. Ultrasonic flaw detection has long been the preferred method for nondestructive testing in welding applications. This safe, accurate, and simple technique has pushed ultrasonics to the forefront of inspection technology.
To determine the proper scanning area for the weld, the inspector must first calculate the location of the sound beam in the test material. Using the refracted angle, beam index point and material thickness, the V-path and skip distance of the sound beam is found. Once they have been calculated, the inspector can identify the transducer locations on the surface of the material corresponding to the crown, sidewall, and root of the weld.
UT Plate & Inspection
UT - Ultrasonic testing of plate or rod is done with Straight probes or other wise known as Normal or TR probes. These can be either Single transducer or Dusl crystal based on the application and parameters.
For years, Plates are inspected by UT Ultrasonic testing method for discontinuties like Lamination defects and Rods for Piping cracks. Ultrasonic testing is found to be satisfactory testing method for plates keeping its reliability and repeatability highly dependent on the technician inspecting.
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