Patent ID: 7137897

Claim:
A shaft ( 1 ) having a co-rotating element ( 2 ) fitted and secured thereto, the shaft being cylindrical at least in the region in which the element ( 2 ) is fitted, wherein the shaft is a balancing shaft of an internal combustion engine and wherein the element ( 2 ) is a balancing weight with an eccentric center of gravity ( 11 ), the element includes a cylindrical seating surface ( 12 ) and at least one surface which is located perpendicular to the seating surface, and a weld bead located at least in part in a fillet formed between the cylindrical seating surface ( 4 ) of the shaft ( 1 ) and that surface ( 6 ; 8 ; 60 ) of the element which is located perpendicular to the seating surface, wherein the welding bead ( 20 ; 30 ; 40 ; 50 ; 61 ; 71 ) is disposed on that side of the shaft ( 1 ) which is remote from the center of gravity ( 11 ) and starts at a starting point ( 21 ; 31 ; 41 ; 51 ; 62 ; 72 ) located perpendicular to the cylindrical seating surface ( 4 ) of the shaft ( 1 ) and thereafter leads to an end point ( 21 ′; 31 ′; 41 ′; 51 ′; 62 ′; 72 ′) on the surface ( 6 ; 8 ; 60 ) located perpendicular to the seating surface.