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[MW:24972] Probe selection for UT flaw detection on steel casting

By Materials & Welding
Dear Experts
,
Please clarify me the following:

1. How to select right frequency, size of probe  to be selected for UT flaw detection particularly for steel castings?
2. Is it correct to use dual crystal probes for higher thickness [greater 100 mm] ? Is there any selection criteria on single crystal or dual on the basis of thickness, and its  limits recommended - Please provide your answer with supporting reference.

Thanks,
MANIVANNAN.

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