Research of the Influence Friction Stir Welding on the Mechanical Properties of Welded Joints with Aluminum and Copper Alloys

The article considers the influence of the parameters of friction stir welding modes on the formation of the outer surface and microstructure of the welded joint of sheets made of aluminum (AD1) and pure copper (M1). Changing the rotation speed of the welding tool from 600 to 1000 rpm and the range of welding speed from 20 to 100 mm/min allows one to control the amount of input energy, which allows one to transfer the welded materials to a plastic state. The paper considers the thermal cycles measured under the shoulder of the welding tool from the side of aluminum and copper sheets. The maximum temperature was 900 K on pure copper. The parameters of the welding modes also affect the formation of intermetallic layers. If the thickness of the intermetallic layer does not exceed 4–5 μm, then increased values of the mechanical strength of the welded dissimilar joint are observed.