Welding electrode pair and method of welding

摘要

A welding electrode pair of the present invention has substantially columnar first and second welding electrodes coaxially disposed so that their respective tip end faces face each other. Formed on the tip end face of the first welding electrode is a first contact portion protruding therefrom and extending substantially in parallel thereto across the tip end face. Formed on the tip end face of the second welding electrode are second contact portions protruding therefrom substantially in parallel with the tip end face and the first contact portion as if the second contact portions were fit over the first contact portion, extending across the tip end face, and having a substantially circular arc portion at the projected end thereof.