Friction stirring welding method of joining a plated metal member to another metal member with preheating the plating before stir welding

摘要

A metal plating ( 1a ) applied on a joining portion of a first metal member ( 1 ) is heated before a rotating tool ( 13 ) under rotation being pressed against a second metal member ( 2 ) Herein, the rotating tool ( 13 ) under rotation starts being pressed against the second metal member ( 2 ) when the metal plating ( 1a ) has been heated at least up to a specified temperature that is high enough to make the metal plating ( 1a ) in a softened solid state. Thereby, a properly-high joining strength can be provided in a frictional joining of a metal member (1) with a metal plating (1a) thereon and another metal member (2).