Patent ID: 6494011
Filing Date: 2002-12-17
Classification: B21C,B23K

Abstract:
A hollow extruded frame member capable of being welded by friction stir welding, having two substantially parallel face plates and plural ribs connecting said two substantially parallel face plates, wherein:a connection portion is provided between a rib, of said plural ribs, at one end portion of said hollow extruded frame member and one of said substantially parallel face plates, said connection portion being a portion in which the friction stir welding is carried out; in said connection portion between said rib and said one of said two substantially parallel face plates, a connection line, between said rib and said one of said substantially parallel face plates, facing the other of the two substantially parallel face plates, is in a form of a circular arc which protrudes into a side of said hollow portion; and at said one of said two substantially parallel face plates, a protrusion chip protruding from said rib at said one end portion is provided, said protrusion chip extending beyond said one of said substantially parallel face plates.