Patent ID: 8631994

Claim:
A friction-weld interface device for improving a structural strength of an assembly, the interface device comprising: a first component having a concave tapered surface; and a second component having a convex tapered surface that is complementary to and is configured to receive the concave tapered surface of the first component such that the first and second components are arranged substantially along an axis; wherein the assembly is formed by friction welding the convex tapered surface to the concave tapered surface; and wherein the concave tapered surface has a first chevron shape with a trough oriented in a direction substantially orthogonal to the axis in a first side view and a flat shape in a second side view that is rotated about the axis 90 degrees from the first side view, and the convex tapered surface has a second chevron shape with an apex oriented in the direction substantially orthogonal to the axis in the first side view that is complementary to the first chevron shape and a flat shape in the second side view.