Patent ID: 9662740
Date: 2017-05-30
CPC Classifications: B01J,B21C,B23K,B24C,C22F,F16L,F28F,H05B,Y02P,Y10T

Claim:
1. A method for making a tube, the method comprising: providing a hollow first cylinder comprising zirconium or a zirconium alloy, the first cylinder having an outer surface; providing a hollow second cylinder comprising titanium or a titanium alloy, the second cylinder having an inner surface, wherein the first cylinder can fit within the second cylinder; positioning the first cylinder within the second cylinder, wherein the outer surface of the first cylinder opposes the inner surface of the second cylinder; welding together end joints between the first cylinder and the second cylinder to provide a multi-layer billet; induction heating the multi-layer billet to an extrusion temperature; extruding the heated multi-layer billet, thereby metallurgically bonding the outer surface of the first cylinder to the inner surface of the second cylinder, and providing a tube having a wall comprising an inner layer comprising zirconium or a zirconium alloy metallurgically bonded to an outer layer comprising titanium or a titanium alloy; and cold working the tube to reduce the wall thickness and/or diameter of the tube.