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Method for welding at high processing speed with polarised laser beam

: Wolff, N.; Welsing, O.; Behler, K.; Beyer, E.

Bergmann, H.W.; Kupfer, R. ; Arbeitsgemeinschaft Wärmebehandlung und Werkstofftechnik e.V. -AWT-:
Laser beam hardening. ECLAT '90. Proceedings
Witzmannsberg: EMS Europ. Media Service, 1990
European Conference on Laser Treatment of Materials (ECLAT) <3, 1990, Erlangen>
Fraunhofer ILT ()
cylindrical mirror; facet integrator; focussing mirror; homogeneous; incident angle; infrared area; intensity distribution; keyhole; polarised laser beam; welding speed

A new high speed laser welding method is presented which has the following characteristics: - the welding speed is up to ten times higher than in conventional laser beam welding - the band edges have to be formed in a convex cone - the direction of the polarisation is adjusted vertically to the plane of incidence (s-polarisation) i.e. parallely to the plane of joining - if the height of the edges corresponds to the material thickness of the component, the diameter of the beam gets an elliptic shape. Here, the length of the ellipse corresponds to the material thickness. The shaping of the beam perpendiculary to the band edges is made on consideration of the shape of the components.