METHOD OF FRICTION STIR WELDING OF ALUMINUM BILLETS OF VARIABLE THICKNESS Russian patent published in 2019 - IPC B23K20/12 B23K103/10 

FIELD: construction.

SUBSTANCE: invention can be used in the manufacture of welded structures of aluminum semi-finished products of variable thickness by friction stir welding. In the process of welding, step-by-step monitoring of the temperature of the weld surface is carried out behind the welding tool. When fixing the temperature deviation by more than 2 °C with respect to the initial value, carry out the adjustment of the axial force P and the frequency of rotation of welding tool ω according to the given formulas. Welding is performed using a welding tool that contains a working tip and a ledge, one of these parts is integral with the body of the welding tool, and the other is installed with an emphasis into the body of the welding tool through the elastic elements.

EFFECT: method provides a guaranteed full penetration of the root of the seam, stable formation of a defect-free welded joint with minimal residual deformations of the welded aluminum billets.

1 cl, 6 dwg, 1 ex