To study the mechanical properties of the self-piercing riveted joints about 1420 aluminum-lithium al-
loys, the equipment of self-piercing riveting was applied to join 1420 aluminum-lithium alloys (AL1420) with itself
and copper alloys (H62). Tensile-shear tests was used to test mechanical properties of self-pierce riveted joints and
SPSS was utilized to analyze the maximum loads and maximum displacements of joints. The results show that the rivets
of AL1420-AL1420 joint and AL1420-H62 joint are pulled out from lower sheet, and the location in upper sheet con-
tacted with the head of rivet has different tear. The rivet of H62-AL1420 joint is pulled out from lower sheet also, but
the upper sheet merely has some indentation. The mean value of maximum loads of AL1420-AL1420 joint(6 026. 8
N) is supreme among these joints, and the energy absorption value of the AL1420-AL1420 joint(16. 84 J) is greaten
than the two other joints. For the dissimilar metal sheet combinations, the mean value of maximum loads of H62-
AL1420 joint(5 304. 0 N) is superior to the AL1420-H62 joint(5 229. 3 N), and the energy absorption value of the
AL1420-H62 joint(16. 79 J) is higher than the H62-AL1420 joint (15. 08 J). For the combinations of dissimilar
sheets, the joints of AL1420-H62 is a better choice for its higher energy absorption value.