US Patent 7909230 Attaching construction and welding method

An attaching construction includes a first member having a circular tubular welding portion at a distal end and, at a rear end thereof, a holding portion which is integral with the welding portion. The attaching construction includes a second member having an annular first positioning rib, and an annular second positioning rib inside the first positioning rib. The welding portion is positioned within the first positioning rib, and the welding portion is friction welded in place within the first positioning rib while the first member is rotated.