Automatic Ultrasonic Pipe Inspection自动超声波.PDF

Automatic Ultrasonic Pipe Inspection自动超声波.PDF

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Automatic Ultrasonic Pipe Inspection自动超声波

ECNDT 2006 - Poster 221 Automatic Ultrasonic Pipe Inspection W. A. K. DEUTSCH, P. SCHULTE, M. JOSWIG, R. KATTWINKEL, KARL DEUTSCH NDT-Instruments, Sensors Systems, Wuppertal, Germany 1 Introduction This article presents various concepts about the full-body inspection of tubes. The tubes could be seamless but also with longitudinal weld (mostly ERW) in case they replace seamless tubes in their final application. Most common test task is the detection of longitudinal defects. Secondly, a wall thickness measurement could be carried out. For some applications, also transverse defects have to be found. Some production procedures also induce oblique defects and the ultrasonic test might be even extended accordingly. Welded pipe testing (ERW and SAW) is presented in another paper during this conference. 2 High-Speed Tube Testing without Mechanical Rotation Tubes in the diameter range from 20 up to 170 mm can be inspected with the HRP.R- ECHOGRAPH system. The biggest advantage of this system is the high through-put rate of up to 2 m/s which is achieved by avoiding any mechanical rotation. The circumference of the pipe is surrounded by stationary probes. The number of probes is sufficient to produce overlapping sound fields for full sound coverage. The type and orientation of the probes allow for the detection of longitudinal and transverse flaws. Longitudinal defects are detected by sound transmission in both circumferential directions. Transverse defects require sound transmission in the tube axis direction. A precise evaluation of the flaw length is much more reliable than with any rotational system since the defect is always detected by the same probe with several ultrasonic shots. Also, the detection of short defects is a strong point of a stationary system. In addition, a wall thickness measurement and lamination test might be carried out. Fig. 1: HRP.R-Echograph high speed tube test a) angle probes for

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