Patent ID: 9044824
Filing Date: 2015-06-02
Classification: B23K

Abstract:
1. A method for laser cutting of a work piece using multiple laser beams guided to a processing region, comprising: generating a melt and forming a keyhole in a work piece using a first laser beam in a cutting direction parallel to a plane of a surface of the work piece; guiding at least a second laser beam onto selected surface regions of the melt in a position separated from the first laser beam in a direction perpendicular to the cutting direction, and arranged to follow the first laser beam along sidewalls of a kerf formed by the first laser beam; and evaporating material from the melt using the second laser beam, thereby forming a shaped melt flow barrier with a controlled high pressure in a Knudsen layer such that at least a part of the melt is forced out of the processing region in a way that forms a kerf having a cut front and sidewalls, wherein the first laser beam is guided in front of the second laser beam on the surface of the work piece, in the cutting direction.