Groove form and method for improving mechanical property of laminated armor aluminum alloy welded joint

The invention discloses a groove form and method for improving the mechanical property of a laminated armor aluminum alloy welded joint, and belongs to the technical field of aluminum alloy welding. The upper part of the end face of the side wall of the plate A is milled into a stepped side wall, the lower part of the end face of the side wall of the plate B is milled into a stepped side wall, and the stepped plane of the plate B is lapped on the stepped plane of the plate A; and the vertical surfaces of the steps of the plates A and B incline backwards by 35 degrees and are overlapped to form an upper welding strip area and a lower welding strip area of which the sections are isosceles trapezoids. The machining and welding method comprises the steps of blanking, groove machining, step face milling, correction through an oil press, AB plate assembling, welding of the assembled plates and physical and chemical analysis of the welded plates, wherein the upper vertical face and the lower vertical face of the ste