WELDING GUN ARM AND METHOD OF MANUFACTURING SAME

摘要

An arm main body of a welding gun is formed of an aluminum alloy. An anodic oxide coating is formed on an entire surface of the arm main body. The arm main body is then machined to remove the anodic oxide coating formed on a power feeing terminal portion and an electrode tip connecting portion which are provided in the arm main body. The anodic oxide coating may be subjected to a sealing treatment with a dispersion liquid in which a magnetic material is mixed in dispersion. Alternatively, the arm main body formed of an aluminum alloy may be subjected to an anodic oxide coating treatment with a treatment liquid in which a magnetic material is mixed in dispersion.