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Understanding the material flow path of friction stir welding process using unthreaded tools

Article dans une revue avec comité de lecture
Author
LORRAIN, Olivier
300413 Ecole Nationale Supérieure des Arts et Metiers Metz
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
LAWRJANIEC, Didier
302704 Institut de soudure
ZAHROUNI, Hamid
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
300413 Ecole Nationale Supérieure des Arts et Metiers Metz
ccFAVIER, Véronique
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
469561 ENSAM-LIM

URI
http://hdl.handle.net/10985/17929
DOI
10.1016/j.jmatprotec.2009.11.005
Date
2010
Journal
Journal of Materials Processing Technology

Abstract

Material flow during friction stir welding is very complex and not fully understood. Most of studies in literature used threaded pins since most industrial applications currently use threaded pins. However, initially threaded tools may become unthreaded because of the tool wear when used for high melting point alloys or reinforced aluminium alloys. In this study, FSW experiments were performed using two different pin profiles. Both pins are unthreaded but have or do not have flat faces. The primary goal is to analyse the flow when unthreaded pins are used to weld thin plates. Cross-sections and longitudinal sections of welds were observed with and without the use of material marker (MM) to investigate the material flow. Material flow with unthreaded pin was found to have the same features as material flow using classical threaded pins: material is deposited in the advancing side (AS) in the upper part of the weld and in the retreating side (RS) in the lower part of the weld; a rotating layer appears around the tool. However, the analysis revealed a too low vertical motion towards the bottom of the weld, attributed to the lack of threads. The product of the plunge force and the rotational speed was found to affect the size of the shoulder dominated zone. This effect is reduced using the cylindrical tapered pin with flats.

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