Kirchhoff Automotive Deutschland Gmbh

Jan Stuhrmann

Christian Dahmen

The invention relates to a method for laser welding the end faces of the joints () of two connecting flanges (), which are held in an adjoining manner, of two connecting partners () made of a steel material. According to the method, in addition to being moved in the advancement direction, which follows the longitudinal extension of the joints (), the welding laser beam () is moved back and forth in an oscillating manner transversely to the advancement direction. At least one of the two connecting partners () to be welded at the connecting flange () joints () is equipped with a metal coating at least in the region of the respective connecting flange (). The weld pool produced by the energy input during the laser welding process is kept in a liquid state in order to allow degassing processes and/or distribution processes to be carried out in a controlled manner for phases of the metal coating of the at least one connecting partner, said metal coating being integrated by the welding process, wherein the welding laser beam is oscillated at a frequency of at least 80 Hz.

Method for laser welding the end faces of the joints of two connecting flanges held in an adjoining manner

A method for laser welding the end faces of joints of two connecting flanges, which are held against each other, of two connecting partners made from a steel material, of which at least one is provided with a metallic coating with an evaporation temperature that is below the melting temperature of the steel material. The method is carried out such that, for the process of laser welding, the connecting flanges of the two connecting partners are held against each other enclosing an angle that opens pointing in a direction from the joint side on which the laser is applied, as a result of which a degassing gap, which increases in the direction of heat introduction, is provided between the connecting flanges, through which degassing gap evaporation products of the coating material resulting from the introduction of heat are carried off.

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Drolshagen, Germany

Jan Stuhrmann