Laser Beam Micro Welding With High Brilliant Fiber Lasers

Spatial power modulation for laser beam micro welding by superposing an oscillation movement to the feed direction is gaining more and more importance, especially for welding of difficultto-weld materials, e.g. aluminum, copper or zinc-coated steel sheets. Up to now, there are no adequate machine techniques available providing oscillation frequencies of more than 5 kHz. Examinations about the dynamic behavior of conventional galvanometric scanners with integrated oscillation movement ("wobble function") are presented. These systems are commonly used for laser beam micro welding but their dynamic behavior at high oscillation frequencies is not known yet. A focus of the examinations is on alternative scanning systems, presenting their characteristics and their applicability for laser beam micro welding. Applications presented are welding experiments for an adapted seam width in bead-on-plate welding.