WELDING METHOD AND APPARATUS FOR DISSIMILAR METALS

摘要

PURPOSE: A friction welding method of a dissimilar material and a device are provided to obtain a bonding rate more than 90 % by protruding a hub of a first bonding member over 3 mm according to the friction welding method or the device. CONSTITUTION: A friction welding method of a dissimilar material comprises a touching step in which a second bonding member touches a first bonding member in touching pressure of 8.5-10.5 bar in one second point of time after moving the fixed second bonding member towards the first bonding member; a melting step in which the first bonding member and the second bonding member are melted with friction heat by pressurizing the second bonding member in 45-55 bar pressure until 55 seconds while rotating the first bonding member at 500-630 rpm for friction between the first bonding member and the second bonding member; a forging step for bonding the first bonding member and the second bonding member while a melted material is hardened by pressurizing the second bonding member in 95-105 bar pressure during 38-42 seconds after stopping the first bonding member; and a postprocessing step in which a flash generated in a welding area is removed after the forging step. The second bonding member moves as 21 mm from an initial position during a friction step and moves as 30 mm from the initial position during the forging step.