Abstract: In order to reduce the requirements of equipment, on the basis of friction stir welding filling technology with solid state joining, the friction plug repair welding tests were carried out by shoulder auxiliary heating methods for 6082 aluminum alloy, and well-formed repair welding joints were obtained. EBSD analysis of nugget zone of joint shows that the grain refinement is significantand there is obviouspreferred orientation. With the increase of rotating speed from 1 800 r/min to 2 000 r/min, the grain shape changes from equiaxed grain to linear hammer, the average grain size increases, and thecomposition of high-angle grain boundary decreases slightly. The mixed texture of deformation, shear and recrystallization is found in the nuggest zone, and the composition of recrystallization texture increases with the increase of rotational speed. With the increase of the rotating speed, the effectof the increasing speed on the deformation rate decreases, while the effectof the increasing speed on the recrystallization increasesaccordingly.

Key words: auxiliary heating, friction plug welding, preferred orientation, texture