Internal expansion tool and method for inter-stage inertia friction welding of blisk

The invention relates to the technical field of inertia friction welding, in particular to an internal expansion tool and method for inter-stage inertia friction welding of a blisk. The internal expansion tool comprises a plurality of internal expansion blocks and a plurality of threaded supporting rods, and the multiple internal expansion blocks are sequentially spliced to form an annular structure; the two ends of each threaded supporting rod abut against the two oppositely-arranged inner expansion blocks correspondingly and are used for supporting the welding inner circle faces of the two blisk bodies to be welded, and the outer diameter of the annular structure is the same as the diameter of the welding inner circle faces. The internal expansion tool and method for the inter-stage inertia friction welding of the blisk aim at solving the problem that the machining difficulty after welding is large due to the web plate structure of the blisk. 本发明涉及惯性摩擦焊接技术领域，具体涉及一种用于整体叶盘级间惯性摩擦焊接的内胀工装及方法。该内胀工装包括多个内胀块和多个螺纹撑杆，