| 摘要 |
PROBLEM TO BE SOLVED: To determine the shape of a welded part in a wide application range regardless of differences in the thickness of a plate, the presence or absence of sagging, or the presence or absence of fireproof coatings. SOLUTION: A measurement plane 8 is formed on the open side at a distance L from a welded part in a steel skeleton. A probe 10 is pressed against the measurement plane 8 to transmit surface SH waves toward the welded part. Reflected waves receives at the measurement plane 8 are transferred from a flaw detector 12 to a PC 13. Waveforms 16a to 16c typical for every shape of welding (b, c, d,) of full penetration 4, partial penetration 5, and fillet 6 each are accumulated in the PC 13 by experiment in advance. A check waveform 15 is compared with the typical waveforms (a). By comparison, it is determined which the shape of the welded part belongs to full penetration, partial penetration, or fillet. The amplitude of an unwelded part is estimated from the echo amplitude of the check waveform 15. |
