Flange plate stirring friction welding method in single wallboard state

The invention provides a flange plate friction stir welding method in a single wallboard state. The flange plate friction stir welding method comprises the following steps that positioning holes are drilled in wallboards; the wall plate is installed on a welding tool; breaking, milling and trepanning; aluminum skimmings are cleaned, and a flange is installed to fix the mandrel; formal welding is carried out after two times of positioned welding are carried out on a welding seam; and after welding is completed, the flange pressing cap and the pressing mechanism are detached, the wallboard and flange assembly is hoisted and taken down from the frame, and weld joint cleaning and nondestructive testing are conducted. The method has the beneficial effects that the technical leap of the flange plate on the wall plate from fusion welding to friction stir welding is realized, the product welding quality and the welding seam reliability are greatly improved, the product welding deformation is reduced, and the method h