| 摘要 |
Metallic materials 1, 2 having a melting point of at least 2000°C are caused to abut against each other in a welding part 3, the rear face side of the welding part 3 is covered by a backing member 4 having a thermal conductivity of 30 W/mK or lower, and then a columnar probe 6 of a rotary tool 5 comprising an Ir alloy is inserted into the front face side of the welding part 3 to weld the metallic materials 1, 2 together. On the front face side of the welding part 3, inactive gas is supplied into a shield cover 8. The rotary tool 5 is moved along a longitudinal direction of the welding part 3 while rotating the rotary tool 5, whereby the metallic materials 1, 2 are welded together. By using the rotary tool 5 comprising an Ir alloy, the refractory metals can be welded to each other by means of friction stir welding since the rotary tool is provided with the sufficient durability. |
