The combined process of solid鄄state filling+friction stir repaired welding has been used to repair the
keyhole defect in 2219 aluminium alloy friction stir weld,and the microstructure and mechanical properties of the re鄄
paired joint at the keyhole position have been analyzed. As indicated,the microsturcture of the repaired joint can be
divided into three distinctive region:nugget zone( NZ), thermomechanical affected zone( TMAZ) and heat affected
zone( HAZ). The nugget zone consists of refined equiaxed grains, and a greater bending deformation occurs in
TMAZ. The mechanical properties measurements demonstrate that the tensile strength of the repaired joint can reach
335 MPa,and the ductility can get by 8. 0%.