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COMPARATIVE STUDY OF MECHANICAL INHOMOGENEITY OF LASER AND FRICTION STIR WELDED JOINTS OF AL-MG-SI ALLOY

1 IVANOV Sergei
Co-authors:
1 PANCHENKO Oleg 2 MICHAILOV Vesselin 1 KARKHIN Victor 3 VELICHKO Olga
Institutions:
1 Peter the Great St.Petersburg Polytechnic University,St.Petersburg, Russia
2 Brandenburg University of Technology, Cottbus, Germany
3 Laser Technologies Centre, St. Petersburg, Russia
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1400-1405
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
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Abstract

Microstructural and mechanical inhomogeneity of laser beam (LBW) and friction stir (FSW) welded joints of 4 mm thick 6082-T6 Al-Mg-Si alloy was studied. Thermal cycles measured in heat affected zone (HAZ) showed that LBW has a much higher heating and cooling rates than FSW. Distribution of local microhardness and local strain in tensile specimens revealed that fracture of the joints corresponds to a region with minimum hardness. LBW tensile samples were fractured in weld metal, FSW samples - in HAZ. It has been found that tensile properties and ductility of joints is significantly lower than those of the base metal. The LBW and FSW joint efficiency in terms of yield stress was about 71% and 61% respectively. Joint efficiency in terms of elongation was 7.8% (LBW) and 19% (FSW). It is explained by the strain concentration in the lower strength joint region.

Keywords: Friction stir welding, laser welding, Al-Mg-Si alloy, temperature field, microstructure

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