Friction stir welding

特許 権利維持 An object of the present invention is to provide a friction stir welding tool which enables friction stir welding of a wide range of materials, from low-melting temperature metallic materials including aluminum to high-melting temperature metallic materials including steel. An entire friction stir welding tool or a tool tip including a pin is made of Mo alloy having a dual phase microstructure of Mo and intermetallic compound Mo5SiB2.