| 摘要 |
Disclosed is a friction stir welding method for welding two members (4, 5) to be welded which differ in physical properties and/or mechanical properties by abutting the two members to each other, inserting a pin portion (2) of a rotary tool (1) having the pin portion and a shoulder portion (3) to the abutment surfaces of the two members (4, 5), and moving the rotary tool (1) along the abutment surfaces. The pin portion (2) is inserted to only one of the members (4), the pin portion is not inserted to the other of the members (5) but only the shoulder portion (3) is set in contact with the other of the members, and, while this condition is maintained, the rotary tool (1) is moved. With this method, only the member on the side where the pin is inserted can be made to undergo plastic flow attendant on a friction stir action. The metal in plastic flow is pressed against the opposite member at an elevated temperature and high pressure, whereby diffusion of atoms is caused in the vicinity of the abutment surfaces, and the members are welded. <IMAGE> |
