Lasag Ag

Hans Peter Schwob

Walter Zürcher

Joachim Hertzberg

Friedrich Durand

Bruno Knobel

Ronald Gianotti

Thomas Sidler

Simone Amorosi

Knobel Bruno

Martin Von Allmen

Christian Wissing

The invention relates to a laser spot welding process for executing a spot weld in two successive steps, namely a first step of preparing the surface state of the material to be welded and a second step of welding as such. The luminous energy (BR) reflected by the weld region of the material is measured in real time during the first step and then processed by a controller circuit () connected to a control circuit () of the laser source (). In this way, the characteristics (LM) of the laser beam are adjusted in real time as a function of the measurements effected to allow effective control of the quality of the weld obtained, and in particular of its dimensions. The invention also relates to a welding device for implementing this process.

Process and apparatus for spot welding with a laser beam

An apparatus () for generating a rotating laser beam () which may used for various applications including welding, cutting, drilling or ablation of materials. More particularly, the apparatus is able to produce a fast rotating and accurate laser beam, because the main optical device () that is rotated consists of a reflecting surface () rotating about an axis (X) that it intersects.

Apparatus for generating a rotating laser beam

The present invention relates to an apparatus () for generating a rotating laser beam () which may used for various applications including welding, cutting, drilling or ablation of materials. More particularly, the apparatus () according to the present invention is able to produce a fast rotating and accurate laser beam, because the main optical device () that is rotated consists of a first reflecting surface () rotating about an axis (X), a second reflecting surface () having an annular shape, wherein the first reflecting surface () redirects said laser beam in to the direction of the second reflecting surface (), which reflects said laser beam towards said axis (X).

A technique for ablating a metal workpiece by the use of laser beam radiation at an efficiency higher than heretofore possible and an improved regulation of the ablation process. Undesired side effects of the ablation process are eliminated by the entire and complete ejection of the molten metal at the point of beam impingement so that no material remains on the workpiece in the areas between contiguous points of ablation. The appropriate selection of beam intensity and the selection of pulse shape provide the inventive technique.

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Uetendorf, Switzerland

Hans Peter Schwob