Patent ID: 8043021
Filing Date: 2011-10-25
Classification: B23K,Y10T

Abstract:
1. A rotationally symmetrical fastening element comprising: a shank having a predetermined length, said shank includes a proximal end and a distal end; an axially centralized rounded tip formed on the distal end of said shank, said axially centralized rounded tip to be included in a friction-welded joint with a flat component; a truncated conical lateral surface adjoining the tip, said truncated conical lateral surface extending a predetermined distance towards the proximal end of the shank; a radially extending flange extending outwardly from said shank; a shoulder formed at an end of the radially extending flange; a flute formed between said radially extending flange and a large diameter end of the conical lateral surface for receiving material melted during formation of the friction-welding joint, wherein said shoulder surrounds the flute, is axially recessed in relation to the tip and is included in the friction-welded joint; wherein the truncated conical lateral surface is formed with straight lines which intersect at an imaginary vertex V which is located beyond the rounded tip, wherein the truncated conical lateral surface is configured with an axial length H wherein said shoulder limits the movement of the fastening element during formation of the friction-welded joint without penetration through the flat component.