ULTRASONIC FLAW DETECTION OF STEEL PIPE
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专利名称：ULTRASONIC FLAW DETECTION OF STEEL PIPE
发明人：NISHIFUJI KATSUYUKI,USHIYAMA AKIO
申请号：JP21670287
申请日：19870831
公开号：JPS6459152A
公开日：
19890306
专利内容由知识产权出版社提供
摘要：PURPOSE:To enable a highly sensitive detection of a flaw by a creeping wave flaw detection method, by performing a detection of an internal flaw on a steel pipe void of a weld bead such as seamless pipe and seam-welded pipe by a transverse wave or longitudinal wave angle beam flaw inspection method to bring an angle of roof of a probe above a specified value in the detection of an outer surface flaw. CONSTITUTION:A probe 10 for transverse wave angle beam flaw detection and a probe 11 with the angle of roof for creeping wave flaw detection above 3 deg. are arranged in contact with a seamless pipe 7. With the probes 10 and 11 fixed, the pipe 7 is advanced straight in rotation. An internal flaw of the pipe 7 is detected with the probe 10, and its external flow with the probe 11. This brings the angle of roof of the probe 11 above 3 deg. to improve the S/N ratio, thereby enabling a short-range detection of flaws at a high sensitivity with respect to a steel pipe with a remarkable attenuation of ultrasonic waves.
申请人：NKK CORP
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