Avtomaticheskaya Svarka (Automatic Welding), #2, 2023, pp. 10-17
Strength and structure of butt, overlap and fillet joints of АМg6М alloy produced by friction stir welding
A.G. Poklyatskyi, S.I. Motrunich, V.E. Fedorchuk, I.M. Klochkov
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
The paper deals with the results of studying the structure and strength of butt, overlap and fillet joints of AMg6M aluminium alloy,
produced by friction stir welding (FSW). It is shown that a weld nugget with fine-crystalline structure forms as a result of intensive
plastic deformation. The size of grains, which are of practically globular shape, does not exceed 4…5 ~m, and that of dispersed
phase precipitates – ≤ 1 ~m. In the zone of thermomechanical impact, in addition to fine grains, somewhat larger elongated grains
(6…7 мкм) form, which are oriented along the direction of plasticized metal displacement by the tool working surfaces. Here, in
the heat-affected zone, where the metal did not undergo any deformational impact, the maximum size of its grains is on the level
of 10…15 ~m. The strength limit of samples of butt joints and fillet joints, produced by making butt and overlap-butt welds, is
on the level of 335 – 350 MPa at their static tension, and it practically does not depend on the welded sheet location either from
the advancing side or from the retreating side, or on the weld orientation relative to their flanging direction. Here, the butt joint
samples fail mainly through the base metal or the boundary of zones of thermomechanical and thermal impact. Samples of fillet
joints produced by overlap-butt welds, fail in the zone of weld-to-base metal transition in the thermomechanical impact zone, and
those produced by butt welds fail also through the base metal. 16 Ref., 1 Tabl., 10 Fig.
friction stir welding, AMg6M aluminium alloy, fillet joints, strength, butt joints, overlap joints
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