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Friday, 21 October 2016

(DC) BLOCK & (RC) BLOCK IN ULTRASONIC INSPECTION.

Distance calibration Block :-The DC AWS block is a metal path distance and beam exit point calibration standard that conforms to the requirements of the American welding society (AWS) and the American association of state highway and transportation officials ( AASHTO).  Instructions on using the DC block can be found in the annex of American society for testing and materials standard E164, standard practice for ultrasonic contact Examination of weldments.
RESOLUTION CALIBRATION BLOCK:-The RC block is used to determine the resolution of angle beam transducers per the requirements of AWS and AASHTO. engraved index markers are provided for 45,60, and 70 degree refracted angle beams.