Patent ID: 8890022

Claim:
A method ( 10 ) for welding two metal parts ( 12 , 14 ) from aluminum alloys with the steps: melting the metal parts ( 12 , 14 ) to be joined in a weld region ( 18 ) through an energy input by means of a laser beam ( 20 ) with the formation of a weld seam ( 22 ), smoothing the surface ( 28 ) of the weld seam ( 22 ) through a further energy input with partial melting of the weld seam ( 22 ) in the region of the surface ( 28 ), wherein the further energy input is carried out by means of a defocused laser beam ( 20 ′), of which the focal point is positioned in the beam direction ( 24 ) in front of or behind the surface ( 28 ) of the weld seam ( 22 ), and wherein the defocused laser beam ( 20 ′) and the surface normal of a surface ( 26 , 28 ) of the two metal parts ( 12 , 14 ), to which the laser beam is applied, incorporate an angle of greater than or equal to 5 degrees.