Experimental investigations were carried out to discover a possible approach to detect weld root to throat crack in deck-to-rib welded joints by ultrasonic testing. Twenty-three samples, manufactured with artificial cracks to simulate the welded parts of deck-to-rib, were subjected to ultrasonic testing. Crack features, such as width, length, depth, and propagation path, were considered. A technique involving double-probe ultrasonic testing was proposed. The transmitted signal’s amplitudes under different cases were compared. The results revealed that the ratio ωe of signal amplitude at the crack tip to the signal amplitude of uncracked areas was adopted to calculate crack length (a ωe value of one-third is suggested). Additionally, a D-A curve comparison technique (where D is the distance between the probe index to the weld toe and A is the wave signal amplitude) was proposed based on the test results. According to the relationship between crack depth and signal amplitude, a formula to calculate crack depth was proposed. The difference in curve shapes was used to distinguish crack propagation paths, which propagated horizontally to the weld and obliquely to the weld throat.
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