Trumpf Laser- Und Systemtechnik Gmbh

Robert Boschgmbh

Peter Stritt

Nicolai Speker

Christian Solf

Thomas Graf

Marcel Schäfer

Philipp Scheible

A laser beam directed is moved relative to a workpiece to weld along a weld seam and form a weld pool in the area surrounding the laser beam. The weld pool has a characteristic oscillation frequency f, and a laser power is modulated with a modulation frequency f and a modulation amplitude &#x3a0;=1&#x2212;P/P, where Pis minimal and Pis maximal laser power during a modulation period. For a normalized characteristic oscillation frequency &#x39b;and a normalized modulation frequency &#x39b;, &#x39b;&#x2265;2.2*&#x39b;, with &#x39b;=f&#xb7;d/&#x3bd;, where &#x3bd; is the feed rate of the laser beam, and dis diameter of a beam focal spot. Also, &#x39b;=f&#xb7;d/v, where fis a measured characteristic oscillation frequency, dthe diameter of the beam focal spot, and vis the feed rate of laser beam, all during a test measurement without modulation of the laser power.

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Stuttgart, Germany

Peter Stritt