Brief description of the detection of defects on the metal tubes has internal ribs helicouidales.

摘要

The method relates to the detection and the evaluation of the defects existing on the walls of metal tubes with helical ribs. & br / the method consists in using the detection means and evaluation by ultrasound. According to this process is determined for each signal received by an emitter - receiver er to the length of the outward path - return carried out by the ultrasound beam corresponding to the signal and before comparing the amplitude of the signal with a determined threshold is to provide a correction to any of the terms of the comparison, taking into account the length of the path of the signal. & br / application to the control of tubes for heat exchangers.