Nowadays a great accent lies in the quality control of weld joints. Presence of the defects in weld joints and incorrect diagnostics usually causes the collision and the crash of welded constructions. The paper deals with the comparison of results obtained by the ultrasonic techniques, TOFD and Phased Array with the classical radiography method. The differences in defect size determined by various methods lead to different results determining the residual life of welded construction.
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