TY - JOUR

T1 - Effect of the gap width in AZ31 magnesium alloy joints obtained by friction stir welding

AU - Chiuzuli, Fernanda Rocha

AU - Batistão, Bruna Fernanda

AU - Bergmann, Luciano Andrei

AU - Alcântara, Nelson Guedes de

AU - dos Santos, Jorge Fernandez

AU - Klusemann, Benjamin

AU - Gargarella, Piter

N1 - This study was financed in part by the support of the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. The authors also thank the grant #2019/04613–3, São Paulo Research Foundation ( FAPESP ).

PY - 2021/11/1

Y1 - 2021/11/1

N2 - Thin AZ31 magnesium alloy sheets, i.e., 2 mm thick, are welded by Friction Stir Welding (FSW) in butt joint configuration using gap width up to 1.15 mm. All welds present good surface finishing and no internal defects, except for the weld produced using the maximum gap width. A reduction of the weld thickness within the Stir Zone is seen with the increase in gap width, leading to a maximum thickness reduction of 8.5%. Microstructure and Vickers hardness investigations reveal no influence of the gap width on these properties. Up to a gap width of 0.51 mm, a slight decrease in the Ultimate Tensile Strength (UTS) is observed with increasing gap width. For larger gap widths, the UTS, as well as the fracture strain, are constant. To keep the metallurgical integrity, a maximum gap width of 1 mm seems acceptable for joints of thin AZ31 magnesium alloy sheets produced by FSW.

AB - Thin AZ31 magnesium alloy sheets, i.e., 2 mm thick, are welded by Friction Stir Welding (FSW) in butt joint configuration using gap width up to 1.15 mm. All welds present good surface finishing and no internal defects, except for the weld produced using the maximum gap width. A reduction of the weld thickness within the Stir Zone is seen with the increase in gap width, leading to a maximum thickness reduction of 8.5%. Microstructure and Vickers hardness investigations reveal no influence of the gap width on these properties. Up to a gap width of 0.51 mm, a slight decrease in the Ultimate Tensile Strength (UTS) is observed with increasing gap width. For larger gap widths, the UTS, as well as the fracture strain, are constant. To keep the metallurgical integrity, a maximum gap width of 1 mm seems acceptable for joints of thin AZ31 magnesium alloy sheets produced by FSW.

KW - AZ31

KW - Butt joint configuration

KW - Friction stir welding

KW - Gap width

KW - Lightweight material

KW - Mg alloy

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85119073669&partnerID=8YFLogxK

U2 - 10.1016/j.jmrt.2021.10.115

DO - 10.1016/j.jmrt.2021.10.115

M3 - Journal articles

AN - SCOPUS:85119073669

VL - 15

SP - 5297

EP - 5306

JO - Journal of Materials Research and Technology

JF - Journal of Materials Research and Technology

SN - 2238-7854

ER -