METHOD AND APPARATUS FOR LASER WELDING OF TWO JOINING MEMBERS OF PLASTIC MATERIAL

摘要

In a method and an apparatus for laser welding of two joining members of plastic material in which a focussed laser beam is emitted into a welding zone in the region of the boundary surfaces of the joining members arranged in such a way as to face one another so as to form a weld seam having a particular seam depth between the joining members, it is provided that the laser power density is modulated during the welding process in a direction of the seam depth in the welding zone.

主权项

1. A method for laser welding of two joining members of plastic material in which a focussed laser beam is emitted into a welding zone in the region of the boundary surfaces of the joining members facing one another so as to form a weld seam having a particular seam depth between the joining members, wherein the laser power density is modulated during the welding process in a direction of the seam depth in the welding zone,
wherein the modulation of the laser power density is performed by a modulation of the focal position of the laser beam in the direction of the seam depth, wherein the modulation frequency of the laser power density in the direction of the seam depth is correlated with the feed rate of the laser beam in a direction of seam extension in such a way that the focus EF passes over the seam depth of the weld seam at least once when the laser beam is moved in the direction of seam extension.