Thin-wall aluminum alloy electronic beam welding method

The invention provides a thin-wall aluminum alloy electronic beam welding method. The method includes the following steps that (1) an aluminum alloy workpiece to be welded is cleaned; (2) a sample rushing method is adopted to fix parts to be welded to the welding position; (3) the electronic beam focusing distance is adjusted, and a focus is made to be located below a welding plane; (4) manual spot welding, programming welding and decorative welding are sequentially conducted on the same welding seam, and the aluminum alloy is formed by welding; (5) the electronic beam welding work is finished, and the welded workpiece is taken out. The thin-wall aluminum alloy electronic beam welding method has the advantages that the workpiece to be welded is fixed through the sample rushing method, and no welding fixture is used exclusively; through the penetrating power of the electronic beam, and the distance between the workpiece and an electronic gun is adjusted, so that the focus of the electronic beam is located below the surface of the workpiece to be welded, and it is avoided that air holes and impurities are generated through reaction between the focus of the electronic beam and the matter on the surface of the aluminum alloy; one welding seam is formed through three times of welding, and it is avoided that when one-time forming is conducted through welding of conventional electronic beams, the heat amount is too large, and the workpiece is deformed.