ABSTRACT
Experimental equipment for friction stir welding (FSW) allows to obtain thin high-quality butt joints on optimal welding modes at different linear speeds. Mathematical modeling allows to analyze the stress-strain state and thermomechanical processes in the FSW joint zone, and to predict the operational properties, strength and service life of welded structures. The temperature distributions from the volume source of heating during FSW were visualized, and the residual deformations and stresses in the zone of butt-welded joints of thin sheets of magnesium alloys were numerically determined using finite-element models. The width of the HAZ decreases, maximum residual stresses increase by 10. . .15% while residual plastic deformations decrease with an increase in the linear speed of welding. For future, it is advisable to determine the balance between linear and rotational speed of the FSW tool to obtain greater uniformity of the structure and to reduce heat transfer to the metal during welding.
