Influence of filler wire oscillation on the seam texture in laser beam brazing

Mattulat, Thorsten; Kügler, H.; Vollertsen, Frank

doi:10.1007/978-3-662-60417-5_36

Production at the Leading Edge of Technology 2019

DOI: 10.1007/978-3-662-60417-5_36

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Influence of filler wire oscillation on the seam texture in laser beam brazing

Thorsten Mattulat¹,

H. Kügler²,

Frank Vollertsen³

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2020

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Investigations on the occurrence of different wetting regimes in laser brazing of zinc-coated steel sheets

2020

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In the automotive industry, the seam edge quality of laser brazed seams is a crucial factor for the required high optical quality standards of customer-visible connections of zinc-coated car body parts. The type of zinc coating is decisive for the resulting geometry of the seam edges, which are aspired to be straight. Especially brazing of hot-dip galvanised steel with conventional brazing setup is not resulting in seam edges which fulfil the required optical quality. In this study, the wetting of copper-based filler wire on electrogalvanised and hot-dip galvanised steel sheets is analysed to increase the understanding of the influence of the wetting fronts on the seam edge quality. For this, the wetting fronts are determined in high-speed camera images and the resulting seam edges are captured by microscopic pictures. The results show that two major wetting regimes occur on both types of zinc coatings but with a different occurrence probability: one with a steep wetting front and zinc evaporation in front of wetting ("steep-angle-wetting") and one where liquid zinc connects with the wetting front and creates a flat wetting angle ("flat-anglewetting"). It is found that the resulting seam edge quality is mainly depending on the present wetting regime. However, for flatangle-wetting, in the regime with insufficient seam edge quality, a self-stabilising effect is identified, which is responsible for a missing process window for brazing of hot-dip galvanised steel with sufficient seam edge quality.

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Investigations on the occurrence of different wetting regimes in laser brazing of zinc-coated steel sheets

2020

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Manipulation of the cyclic wetting process using longitudinal filler wire oscillation in the laser brazing of zinc-coated steel sheets

Mattulat

Woizeschke

2020

Procedia CIRP

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Influence of filler wire oscillation on the seam texture in laser beam brazing

Cited by 2 publications

References 0 publications

Investigations on the occurrence of different wetting regimes in laser brazing of zinc-coated steel sheets

Investigations on the occurrence of different wetting regimes in laser brazing of zinc-coated steel sheets

Manipulation of the cyclic wetting process using longitudinal filler wire oscillation in the laser brazing of zinc-coated steel sheets

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