Patent ID: 6325567
Filing Date: 2001-12-04
Classification: B23K,B60G,F16B,F16C,Y10T

Abstract:
An arm member, comprising:a metallic main body made of a pipe member having a peripheral wall; anda metallic coupling member having a connecting portion and a non-hollow protruded portion integrally formed on said connecting portion,wherein said peripheral wall of an end portion of said main body is increased in thickness to have a thickness thicker than that of a portion of said main body other than said end portion,wherein said connecting portion is abutted to said peripheral wall of said end portion to form an abutted portion with said protruded portion inserted into an opening of said end portion, and joined to said peripheral wall by a friction agitation joining method at said abutted portion, whereby said coupling member is coupled to said main body, andwherein said peripheral wall of said end portion of said main body is radially outwardly increased in thickness.