Abstract:The 1420 aluminum-lithium alloy was used as the panel to prepare AA1 joints without interlayer, AA2 joints of 0.1 mm thick polyester plastic film (PET) interlayer and AA3 joints of 1.0 mm thick polycarbonate solid board (PC) interlayer. Repeated tensile tests were carried out on the three sets of test pieces to study the forming quality, failure mode, static failure load, and energy absorption value of the joint. The results show that the interlayer will hinder the opening of the nail, and as the thickness of the interlayer increases, the ability to hinder the opening of the nail becomes larger; The upper plate of the joint with large nails has a large yield, the rivet is torn at the joint between the upper plate and the lower plate, and the joint with a small opening of the nail easily causes cracks in the lower plate; the non-metallic interlayer will improve the stability of the mechanical properties of the joint, reduce the static load value of the joint, and weaken the impact resistance of the joint and the machine. The smoothness of the movement.