Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Siemens Aktiengesellschaft

Thyssen Stahl Ag

Dirk Petring

Wolfgang Schulz

Eckhard Beyer

Reinhart Poprawe

Markus Niessen

Frank Schneider

Peter Loosen

Peter Abels

Kai-Uwe Preissig

Stefan Kaierle

Hans-Georg Treusch

Claudia Peuker

Gerd Meyer

Dieter Bingener

Hartmut Zefferer

Norbert Wolf

Gerd Harzinger

Hans-Dieter Riehn

In a method and device for machining material, an unfocused beam of laser radiation is focused and directed at the material surface, creating an interface of laser radiation and material to be machined. The beam waist, which results from the focusing the laser radiation, is held in the region of the interface of laser radiation and material. The spacing of the beam waist from the upper or lower side of the interface in the axial direction corresponds at most to triple the value of the penetration depth of the interface into the material. The focusing is effected such that components of the laser radiation are made divergent not just in the propagation direction downstream of the beam waist but also in the beam waist itself and/or also in the propagation direction upstream of the beam waist.

Method for machining material using laser radiation and apparatus for carrying out the method

This invention relates to a method for cutting materials using a laser beam, which emerges from a cutting head comprising a cutting nozzle with an inner edge, and is absorbed by the cutting front. The axis of the laser beam is displaced in relation to a workpiece along a cutting line with a fixed orientation in the cutting direction of said workpiece. In this method the position (p) of the cutting head is modulated with regard to its time averaged value, or the laser power and gas pressure in the cutting head are modulated.

Method for cutting materials using a laser beam

A method for material removal to a predetermined removal depth from a workpiece employs a laser beam consisting of one or more sub-beams, each of the latter having a defined beam axis. The axis of the laser beam or the individual axes of the sub-beams are guided along a removal line at a predetermined travelling speed and the laser beam has a predetermined spatial energy flow density that defines a Poynting vector S with a value If (x) and a direction s, the spatial energy flow density creating a removal face with an apex formed by the leading part of the removal face in the removal direction and the face, creating a removal edge.

Method for material removal and device for carrying out said method

A method for connecting two or more components including overlapping surface sections via a laser beam. In the method, prior to the laser welding, the components are fixed in a positive fit to at least one of the overlapping surface sections by local cold joining, preferably via rivets or screws and are then laser welded, a laser weld seam being created in close proximity to each fixing point that has been produced by cold joining, in particular as close as possible to the rivet or screw.

Method for connecting components by local cold joining, using for example rivets or screws and laser welding

A method for processing moving workpieces with laser radiation that is focused on a to-be-processed workpiece surface by means of a laser beam that is moved but not relative to the workpiece. The laser beam is focused in a line-like manner and its beam spot corresponds practically exclusively and with full a real coverage to the work piece surface to be processed.

Method and device for treating work pieces with laser radiation

Nozzle assembly for laser beam cutting

Process for the laser beam cutting of strip or plate workpieces,

Process and an arrangement for treating workpiece by means of laser

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He Kerkrade, Netherlands

Dirk Petring