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Villepinte, France

Angelini F.,Institute Of Soudure Industrie | Framezelle G.,Institute Of Soudure | Chauveau D.,Institute Of Soudure Industrie
Welding in the World | Year: 2013

Recent archeometallurgical studies have shown that Greek and Roman large bronze statues were not cast in one piece, in spite of an exceptional mastering of the lost-wax techniques, but resulted from the welding of several parts previously cast. The ancient welding process proved to be very spectacular: liquid bronze (secondary casting) of the same composition as the base metal (primary casting) was directly poured between the two parts to be joined. We have recently shown that the mechanism involved is similar to the one involved in some modern fusion welding techniques such as arc, laser beam or oxy-fuel, which demonstrates the very high level of knowledge achieved by Greek and Roman foundrymen in the control of high-temperature processes. Twenty-one centuries later, high level of non-destructive testing (NDT) expertise is particularly being needed for archeometallurgical examinations of the statues, not only to describe the welding mechanism, but also to identify several variants of the process (particularly concerning the welding preparation). This paper explains how NDT, and particularly ultrasonic phased array, have brought decisive clues to understand the flow fusion welding process applied to the "Captive Gallic", a statue found in 2007 during excavation in the Rhône River in Arles (Southern France). © 2013 International Institute of Welding. Source

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