Abstract
In this work, the features of structure formation during adhesive interaction between welded metal and tool for friction stir welding (FSW) was studied. In the model experiment, which illustrate the layered structure formation during FSW, the Al-Mg alloy AA1050 and copper C11000 were used. The copper, which used as a marker, was distributed over the stir zone, forming the layered “onion ring” structure. Such structure shows that friction stir welding involves layer-by-layer gripping and material transfer. Investigation of the Al-Mg-Sc-Zr alloy welded by FSW prove that during the welding process direct and reverse adhesion transfer occurs. This process is repeated layer by layer, forming a strongly layered structure known as “onion rings”.
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