NDTnet 1998 Aug, Vol.3 No.8

Full-Text - Abstract

In the field of casting using the conception of conventional post-process quality control the amount of wasted casting products can increase caused by long time delays between casting defect origination and defect detection. On the one hand a process integrated detection and characterization of casting defects enables to select waste irmmediately. On the other hand occuring process changings which influence the casting quality, can be controlled. Both advances decrease the amount of waste and finally production costs.

This paper presents a developed conception for process integrated detection and characterization of ligth metal casting defects. A process integrated microfocus-radioscopy system is used to describe quantitatively the origination, size, type and growing velocity of casting defects in 2 dimensions. By this, synchronously recorded acoustic emission signals can be analysed. Aditional to the results of the radioscopy system the Program of Nuclear Engineering (COPPE) made investigations in cooperation with IKPH using a tomography system to get information about the third dimension which meens about the depht and position of the defects inside the casting. The aim of this conception is to use all informations about casting defects giving by radioscopy and tomography to develop and calibrate a acoustic emission system which enables to detect and characterize casting defects. Due to this the combination of this methods will enable to make acoustic emission suitable for industrial applications.

The main characteristics of the harmonic analysis system are the high measuring velocity and the high accuracy of measuring values which can be compared to destructive testing methods.

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

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