WELDING OF STEEL SHEETS BY FRICTION WITH MIXING Russian patent published in 2015 - IPC B23K20/12 C22C38/14 

FIELD: metallurgy.

SUBSTANCE: rotary tool rpm RS is set equal to 100-1000 units. Torque RT is set to 50-500 Nm. Transfer speed TS is set equal to 10-1000 mm/min. Heat feed at welding HIPT (kJ/mm²) is kept equal to 0.3-1.5. Welding steel sheets contain the following substances, in wt %: 0.01-0.2 of C, 0.5-2.0 of Mn; 0.6 or less of Si, 0.030 or less of P, 0.015 of less of S and 0.0060 or less of O. Content of titanium Ti [%Ti] and nitrogen N [%N] is limited subject to HIPT. Equivalent content of carbon C_eq makes 0.5 wt % or less, iron and arbitrary impurities making the rest.

EFFECT: ruled out local heat variation and plastic deformation, hence, better and homogeneous ductility in weld area.

3 cl, 4 dwg, 3 tbl