Defect detection in weld zone using ultrasonic non-destructive testing / Muhammad Aiman Ismail

The defects in the materials can be tested by using Non-destructive testing
(NDT). NOT is defined as a testing of material, component or assembly by
means, which do not affect its ultimate use. One of common methods in NOT is
Ultrasonic testing (UT). UT is a non-destructive technique of describing the
depth or interior structure of a test piece with high-frequency sound waves. UT
can be utilized for flaw discovery, dimensional estimations and material display.
Therefore, by using UT, the defect of the plate can be determined. The defect of
Plate No. 14 B was located on the middle of the plate with the depth of half of
the thickness, which was 5.1 mm. For plate No.6, the defect was detected from
the position 2 by the depth of 5.5 mm as half of the thickness. Thus, the defect
was located on the middle of the welded plate. For plate No. 13, the defect was
determined from the position 2 by the depth of 7.0 mm as half of the thickness.
That is why, the defect was detected at the centre of the welded plate. While, for
plate No.1, the probe was moved to position 2 and the defect was obtained at
the depth of 1.4 mm and sound path, S of 26.2 mm. Lastly for plate No.2, the
probe was moved to position 2 and the defect was obtained at the depth of 5.0
mm and sound path, S of 30.0 mm. In conclusion, the defect present in weld
zone on the plate is successfully determined using ultrasonic testing by
analyzing graph signal of ultrasonic testing.