Effect of Welding Method on Residual Stresses in Welded Joints Made of Aluminum Alloy 1565ch

The results of experimental studies are given on the effect of the welding method of butt joints made in sheets of alloy 1565ch. The level and distribution of transverse residual stresses are investigated. It is proved that, depending on technique, fusion welding results in tensile stresses of 65–120 MPa developing in the central region of the weld. The residual compression stresses of 8–15 MPa are observed in the weld zone during friction stir welding. Annealing of welded joints at 280–300°C for 30 min completely relaxes the residual stress. The application of electrodynamic processing with an exposure time of 0.7–1.8 ms lifts the tensile stresses in the welded joints of alloy 1565chM obtained through fusion welding and forms a stable zone of compression stresses in the mixing zone of joints obtained using friction stir welding.