Controllo TOFD combinato con Pulse-Echo

TOFD is an excellent method for detection and sizing of defects, but cannot be used as a stand alone technique or as a single pass if 100% coverage of the weld volume is required. The best way is to determine and employ an adequate number of TOFD configurations (according to weld thickness and geometry) combined with at least two creeping wave probes in order to guarantee the coverage of the TOFD “dead zone” from 0 to 5-6 mm depth.

The mTomoscan multichannel system allows the 100% weld volume coverage with a single linear scan along the weld according to the ASME CODE CASE 2235-6.

All scans are simultaneous (up to 6 channels in parallel) in order to minimize inspection and stand by times. All scans are than synchronized in order to evaluate TOFD indications with different setups if available. Discontinuities evaluation and sizing are done in real time during examination.

Pulse-echo with scan recording

When TOFDT+P/E technique is not applicable due to weld geometry (limited access like nozzle to shell welds) the inspection is performed using the ISONIC 2001 system which employs an airborne transducers mechanics free scanner capable to monitor the X,Y and angular position of the probe in use. The system record all information in digital forms and displays the scanned area in “top view”, “side view” and “end view” C-SCAN.

ISONIC 2001 with “Airborne Transducers”

Reference list