Abstract:In this study, the microstructure and strength properties of friction stir welded 6061-T6 aluminum alloy to ultra-low carbon steel have been investigated using different advancing speeds of 100, 200, and 400 mm·min −1 at constant rotation rate. Microstructure observations have been conducted by optical and scanning electron microscopy. The joint strength was evaluated on a tensile testing machine. The effect of advancing speed on the shear load of a joint has been found, as well as a relationship between microstructures and mechanical properties.

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<p class="AMSmaintext"> </p><p class="AMSmaintitle">Abstract</p><p class="AMSmaintext">In this work, the effect of the pin diameter on the microstructure, hardness and strength of friction stir welded 6061-T6 aluminum alloy to dual phase steel have been investigated. Microhardness measurements, tensile shear tests, optical microscopy, and scanning electron microscopy with energy dispersive spectroscope (EDS) were the main techniques used. The results showed that friction stir welding can be used for the joining of dissimilar 6061-T6 aluminum alloy to dual phase steel. We have found that the maximum strength is obtained after welding with the highest pin diameter. </p>