Patent ID: 7882998

Claim:
Method for producing a linear welded connection between a first workpiece ( 10 ) and a second workpiece ( 11 ), comprising the following steps of: providing a first workpiece ( 10 ) and a second workpiece ( 11 ), arranging the second workpiece ( 11 ) on a surface of the first workpiece ( 10 ), and placing a friction tool ( 1 ) by the friction area ( 4 ) thereof onto that surface of the second workpiece ( 11 ) which is remote from the first workpiece ( 10 ), rotating the friction tool ( 1 ), with the result that a welded connection is formed between the first workpiece ( 10 ) and the second workpiece ( 11 ), the friction area ( 4 ) rubbing on that surface of the second workpiece ( 11 ) which is remote from the first workpiece ( 10 ), the friction tool ( 1 ) being moved during the rotation thereof along that surface of the second workpiece ( 11 ) which is remote from the first workpiece ( 10 ) and the friction tool ( 1 ) being rotated about an axis ( 3 ) perpendicular to that surface of the second workpiece ( 11 ) which is remote from the first workpiece ( 10 ), the contact region between the friction area ( 4 ) and the second workpiece ( 11 ) running completely in that surface of the second workpiece ( 11 ) which is remote from the first workpiece ( 10 ), so that the friction tool does not penetrate into the volume of the second workpiece ( 11 ), and the rotation of the friction tool ( 1 ) effecting a material transport from the edge of the friction tool ( 1 ) towards the axis ( 3 ) of rotation by means of grooves ( 22 , 22 ′) running in the plane of the friction area ( 4 ), the grooves ( 22 , 22 ′) proceeding from the outer edge region of the friction area ( 4 ) and the grooves ( 22 , 22 ′) running with an inclination with respect to the tangent of the circumference of the friction area ( 4 ) towards the centre (Z).