The
titanium alloy cold
extrusion joint is of a cylindrical structure made of
titanium alloy and comprises a rigid connector section, an
extrusion section and a flexible connector section, a boss is arranged on the inner side of the
extrusion section and is in transition connection with the inner side wall along a certain
slope angle, a first step-shaped convex ring is arranged on the outer side of the extrusion section, and the portion, close to the rigid connector section, of the step-shaped convex ring is a first large-
diameter section; a second step-shaped protruding ring is arranged on the outer side of the rigid connector section and is a second large-
diameter section away from the extrusion section, a protruding ring is arranged on the outer side of the flexible connector section, a groove is formed in the end face of the protruding ring in the radial direction, and the outer
diameter of the first large-diameter section is larger than the outer diameter of the second large-diameter section and the outer diameter of the protruding ring. By providing high interference amount, the joint is tightly attached to the
titanium alloy frame plate of the aircraft after generating plastic deformation, certain anti-push and anti-torsion performance is achieved while the sealing effect is achieved, beneficial hole circumferential
pressure stress is provided for the
titanium alloy frame plate under the cooperation of the high interference amount, the fatigue life of the
titanium alloy frame plate of the aircraft is effectively prolonged, and the service life of the
titanium alloy frame plate of the aircraft is prolonged. And connectors at two ends are connected with external conduits, so that long-life frame-penetrating connection is realized.