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METHOD AND DEVICE FOR LASER-JOINING AT LEAST TWO WORKPIECES USING A VAPOR CAPILLARY AND OSCILLATION OF THE LASER BEAM
 
: Schmitt, Felix; Mehlmann, Benjamin; Gillner, A.; Olowinsky, A.; Havermann, D.

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Frontpage ()

DE 102012008940 A1: 20120508
Deutsch
Patent, Elektronische Publikation
Fraunhofer ILT ()

Abstract
The invention relates to a method and a device for joining at least two workpieces (1, 2) made of similar or dissimilar metal materials to form a component by means of a continuously emitting laser beam (3) forming a weld seam along a joining surface. In an interaction region in the area of the joining surface, the laser beam (3) is partially absorbed and forms a molten bath (11, 12), wherein a part of the joining surface is covered by the molten bath (11, 12), said part forming a load-bearing cross section once the molten mass has solidified. Along the joining surface, the laser beam (3) is focused onto a small beam cross section, with a main direction of the laser beam axis (5) in the direction of the surface normal of the surface of the workpieces (1, 2), upon which the laser beam (3) impinges, and the laser beam (3) is guided along the joining surface of the workpieces (1, 2). A second motion (7) with an oscillating motion component is superimposed on the advancing direction of the laser beam (3), both in the advancing direction and also vertically thereto, wherein the laser beam (3) is applied with an intensity that generates a vapor capillary (8) in the workpieces (1, 2), and the laser beam (3) is continuously coupled into the vapor capillary (8). Starting at said vapor capillary (8), a radial energy transport into the workpieces (1, 2) takes place such that the oscillation of the laser beam (3), and thus of the vapor capillary (8), brings about an energy transport, at least vertically to the advancing direction, said energy transport being directed toward the center of the oscillating motion, thus generating a melting zone.

: http://publica.fraunhofer.de/dokumente/N-271026.html