A B C D Fig. 7A–D — A weld 115 mm in diameter and 12.7 mm thick scanned using a variety of setup parameters. A B Fig. 8 — Scans of 25-mm-diameter, 3-mm wall thickness pipe showing notches. A — Carbon steel pipe; B — stainless steel pipe. notches and holes were scanned with an OmniScan MX using typical phased array inspection procedures based on S-scans. The same setup was used for the two probes except the gain was necessarily reduced for the curved probe. The 6-dB drop criterion was used for sizing. Figures 5 and 6 show sample scan results from the 70- and 38-mm pipes, comparing flat and focused arrays. All the calibration reflectors in the two tubes showed consistent results: smaller-diameter tubes gave more severe defocusing (beam spread) than larger diameters, and focused arrays gave much better lateral sizing results than flat arrays. 22 Inspection Trends / January 2011
Inspection Trends - January 2011 - Winter
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