Abstract
This paper focuses on the improvement of ultrasonic defectoscopy used for machine elements produced by direct laser metal sintering. The direct laser metal sintering process introduces the mixed metal powder and performs its subsequent laser consolidation in a single production step. Mechanical elements manufactured by laser sintering often contain many hollow cells due to weight reduction. The popular pulse echo defectoscopy method employing very high frequencies of several GHz is not successful on these samples. The aim of this paper is to present quadraphonic transmission ultrasound defectoscopy which uses low range frequencies of few tens of kHz. Therefore, the advantage of this method is that it enables defectoscopy for honeycombed materials manufactured by direct laser sintering. This paper presents the results of testing performed on AlSi12 sample.
Highlights
Laser metal sintering, known as a generative production procedure, is a process that enables the manufacture of individual prototypes of machine elements
This paper focuses on the improvement of ultrasonic defectoscopy used for machine elements produced by direct laser metal sintering
The objective of this study is to present a concept developed for the improvement of the transmission ultrasonic defectoscopy method for materials using one ultrasonic head and four heads, i.e. quadraphonic transmission ultrasound defectoscopy (QTUD)
Summary
Known as a generative production procedure, is a process that enables the manufacture of individual prototypes of machine elements. This technology can be successfully used for the production of individual prototypes of small series machine elements [1]. Laser sintering uses three-dimensional CAD data to create one by one thin layers of metal powder [2]. Energy source for sintering are various types of lasers that have power range from 200 W to 400 W. To the gas lasers types HeCd, Ar or CO2 laser, the most common used solid state lasers are Nd:YAG or YAG-lasers
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