Abstract
The mechanical and corrosive properties of welded joints of sheets with 6 mm thickness made of the 1151 alloy of the Al—Cu—Mg system in the T state (hardening and natural ageing) obtained by friction stir welding by single, double welding and bobbin tool welding is studied. It is shown that the change in the friction stir welding scheme does not result in noticeable change in the tensile strength of the welded joint and the weld metal. The grain size in the weld increased from 4.8 µm (single welding) to 10.5 µm when bobbin tool welding. The intercrystall line corrosion resistance of all welding zones (except the base metal) increases by about 1.4 to 2 times depending on the structural area due to the higher cooling speed of single friction stir welding compared to the bobbin tool welding,
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