Patent ID: 8490855

Claim:
A method for creating a hollow assembly that is bisected by a reinforcing disk using friction stir welding, said method comprising: 1) providing two cylinders, each cylinder having a joining end that forms a hollow, the hollows in the two cylinders being two different shapes that form an assymetrical hollow; 2) placing the two joining ends of the two cylinders to form a joint, with a reinforcing disk inserted therebetween; 3) friction stir welding around the two cylinders at the joint to thereby join the two cylinders and the reinforcing disk, wherein a hollowed out and assymetrical inner space is now created at an interface of the two cylinders, with the reinforcing disk bisecting the inner space; and 4) machining the two cylinders to form a hollow assembly that is centered around the inner space and the reinforcing disk, wherein the method further comprises manufacturing the hollow assembly into a ball.