ALUMINUM ALLOY PROPELLER SHAFT AND FRICTION PRESSURE WELDING METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To suppress variation of the total length of each aluminum alloy propeller shaft formed by a friction pressure welding method to improve yield.SOLUTION: A friction pressure welding method includes: a friction process of abutting each yoke member against a tip press-contact surface of both end portions of a tube while rotating the member and pressing it in an axial direction by a predetermined press-contact force; a positional displacement detection process of detecting a displacement amount (position LA) in the axial direction via a travel generated between the tube and both yoke members by the friction process; a rotation stop process of stopping rotation of each yoke member at a point when the detected displacement amount becomes a predetermined amount; and an upset process of outputting an upset pressure command signal for pressing both yoke members in a tube direction by an upset pressure P2 larger than the predetermined press-contact force P1 in the friction process, at a predetermined angle of F2&thetas; before the rotation of each yoke member is completely stopped after a rotation stop signal is output.