摩擦攪拌接合によるNi基超合金とAl合金の異材接合

概要

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Dissimilar lap-joints composed of a Ni-based superalloy, Inconel758, and an Al alloy, AA6063, were fabricated, using an originally developed FSW machine. Mechanical properties and near-interface microstructures were systematically investigated, focusing on the influences of welding parameters; tool rotating speed, traverse speed and pin depth. A series of experiments showed that the microstructure near the welding interface was significantly depending on the welding conditions. Under some specific conditions, a wavy interface was produced with a formation of intermetallic compounds layer. The width of the intermetallic compounds was monotonically increased with the ratio between the tool rotational speed and the traverse speed, N/v. The joint strength was mainly governed by the pin depth. Under a given pin depth condition, the joint strength showed the maximum value at a specific value of N/v.