NDTnet 1998 Aug, Vol.3 No.8

Full-Text - Abstract

In the Institute for Nuclear Engineering and Non-destructive Testing on the University of Hannover, investigations were carried out in cooperation with the Laser Zentrum. Hannover e.V. (LZH) and the Institute of Material Science (IW) concerning particle transport processes during laser dispersing of predeposited hard particle layers. The aim of the investigations was to analyse, the paths, mass flow, velocity and distributions of hard particles inside the molten pool to gain an extended process understanding of the beam/material interactions. Due to the small dimensions (40-120 mm) and high velocities of the particles inside the molten pool (up to 0,2 m/s), microfocus-radioscopy was used in combination with a digital high-speed camera system. This method enables, for the first time, to observe the mass flow within the molten pool.

In this paper, the test and analysis equipment including the image processing system for the observation of particle transport processes will be described. Due to a special digital image processing system the high data flow of image recording rates up to 1000 frames per second could be realised. Some results of the recorded sequences are shown in several examples to give an impression of this application to analyse high speed transport processes during laser dispersing.

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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