Welding method for thin-wall multi-runner alloy workpiece

The invention relates to the technical field of laser welding, in particular to a welding method for a thin-wall multi-runner alloy workpiece. The welding method for the thin-wall multi-runner alloy workpiece comprises the following steps that S1, a first sectional structural part and a second sectional structural part of the thin-wall multi-runner alloy workpiece are subjected to butt welding, and then a first alloy part is obtained; s2, a runner of the first alloy part is conducted, and a second alloy part is obtained; and S3, a skin cover plate is installed on the second alloy part, and after laser welding, the thin-wall multi-runner alloy part is obtained. The welding method for the thin-wall multi-runner alloy workpiece can be suitable for welding of the alloy workpiece with a thin-wall multi-runner structure, a fine size and a small runner sectional area, the air tightness of a welded seam is good, the runner is not blocked, the welding strength of the welded seam can reach 90% or above of that of a bas