Investigations on welding of several materials with adjustable intensity profiles: new approaches and findings

摘要

Adapted laser beam and intensity shapes realized by fiber design offer many opportunities, especially for laser beamwelding. An adjustable ring mode laser beam source was used for the investigations presented. Continuous and pulsedmode are possible, so many combinations and temporal overlays of inner and outer ring power are feasible with a maximumlaser beam power of 6 kW.This work shows investigations for several metallic materials and combinations. For laser beam welding of similar lapjoints made of aluminum-silicon coated hot forming manganese-boron steel the influence of different intensity profiles isanalyzed with regard to weld geometries. Dissimilar lap joints made of aluminum and copper are tested regarding themixing ratio and the homogeneity of the mixing in the weld metal as well as the formation of intermetallic phases. Furthermore,a short digression is made regarding the removal of zinc layers on micro-alloyed, fine-grain structural steelsheets for subsequent reliable wetting for laser beam brazing or for the prevention of spatters for laser beam welding.