ROTATING TOOL

摘要

The present invention provides friction stir welding tool with excellent abrasion resistance and defect resistance. This friction stir welding tool is used in friction stir welding processes, and is characterized in that: a base material is contained therein; the base material contains a first hard phase, a second hard phase, and a binder phase; the first hard phase comprises WC particles; the second hard phase comprises a compound comprising one or more metals selected from a group comprising Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, and one more types of elements selected from a group comprising nitrogen, carbon, boron and oxygen, or a solid solution (excluding WC) of said compound; the binder phase comprises a ferrous metal; and with regards to the composition ratio of the first hard phase and the second hard phase, the percentage by volume of the second hard phase is higher than or the same as that of the first hard phase.