Method for controlling root chained pores in a part with bottom lock structure by using electron beam welding

The invention aims to provide a method for controlling root chained pores in a part with a bottom lock structure by using electron beam welding. The method is characterized by adopting a method combining circular wave welding and triangular wave modified welding phase to weld the part with the bottom lock structure. The method comprises the following steps: firstly using circular wave welding to weld the welded joint of a main body; and then using triangular wave welding to perform modified welding on the welding surface with an undercut defect. The method can be used for solving the problem of chained pores at the root of the welded joint, enhancing the surface state of the welded joint, eliminating the undercut defect, greatly improving the usability of the part, improving the welding efficiency and saving the cost.