Composite wire and robot

Abstract

A composite wire is obtained by bundling a plurality of strands including a first metal wire and a second metal wire. The first metal wire includes a tungsten wire containing tungsten as a principal component, and an oxide film covering a surface of the tungsten wire. The second metal wire contains copper as a principal component. The oxide film has an average thickness of at least 2 nm and at most 50 nm. A ratio of a surface roughness Ra of the first metal wire to a wire diameter of the first metal wire is 0.0049 or lower.

Dependencies are inferred from the claim text.