| 摘要 |
PROBLEM TO BE SOLVED: To automatically determine whether a tube is normal, by integrally evaluating the thickness data of a plurality of spots. SOLUTION: The thickness of the tube at each spot is measured with the ultrasonic flaw detection method, and the measured data are recoded in the memory device. The evaluation is started by reading the recoded data in the computer. Related to the thickness data which is smaller than a predetermined thickness threshold level, it is determined that whether it is normal or that reevaluation is needed, by evaluating the axial direction based on a plurality of thickness data. Similarly, related to the thickness data, it is determined that whether it is normal or re-evaluation is needed by evaluating the circumferential direction, based on the plurality of thickness data. Furthermore, by evaluating the stress of the least thickness part, it is determined that whether it is normal or reevaluation is needed. Related to the thickness data which is determined that the reevaluation is needed, pitting evaluation is performed, and finally it is determined that whether the tube is normal or abnormal. COPYRIGHT: (C)2009,JPO&INPIT
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