| Characterization Of Weld Defects Using Phased Array Ultrasonic Technique
In this study, 15 mm thick steel plates having V and L shaped grooves were welded using electric arc welding with coated electrode. Slag inclusion, crack, porosity, lack of fusion and lack of penetration defects were artificially created in the weld zone of the specimens during the welding process.
Ultrasonic tests were performed on the standard materials having reference defects and the welded specimens having artificial defects. A phased array ultrasonic instrument and a 4 MHz-probe having 16 crystals that were linearly grouped were used for the testing. Ultrasonic test results obtained from reference defects of crack, porosity, slag inclusion and lack of penetration in the reference materials were used as a reference in order to interpret the results obtained from the welded specimens. When it is necessary, focusing was applied to clearly identify and evaluate the defects.
A transverse crack, two slag inclusions, a longitudinal crack and a lack of penetration defects were detected and their positions according to measurement surface were determined in the V shaped weld specimen. In the L shaped weld specimen, a lack of fusion at the root, two porosities and three slag inclusion defects were detected and their positions according to measurement surfaces were determined.
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