Research on friction stir welding of 5754 aluminum alloy with unequal thickness
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Graphical Abstract
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Abstract
A new structure of 1 + 2 was designed in friction stir welding (FSW) of Al alloy sheet with unequal thickness: a specific sheet with similar composition of base metals (BMs) was placed under the thinner sheet as the supporting sheet so that the BM surfaces could be on a plane. The BMs can also be fully penetrated weld with a stirring pin longer than the thickness of the thin sheet. 2 mm and 1.5 mm thick Al alloy sheets were welded by FSW, and parameters were optimized. The highest welding strength reached 96.07% of the thin base metal. Although a slight thinning phenomenon occurred at the edge of the nugget on the retreating side, the specimen still fractured in the heat-affected zone.
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