PROCÉDÉ ET DISPOSITIF POUR LE SOUDAGE LASER D'UNE OU PLUSIEURS TÔLES EN ACIER FAITES EN ACIER DURCISSABLE PAR PRESSION

摘要

The invention relates to a method and to a device for fusion-welding one or more steel sheets (1, 2; 2') made of press-hardenable steel, preferably manganese-boron steel, in which method the fusion welding is performed with supply of filler wire (11) into the weld pool (9) produced exclusively by means of a laser beam (6). In order to improve the hardenability of the weld seam, regardless of whether the steel sheets to be welded to one another are steel sheets of identical or different material quality, according to the invention the filler wire (11) is coated with graphite particles prior to the fusion welding and the filler wire (11) thus coated is introduced directly into the weld pool (9) in such a way that the tip of the filler wire (11) melts in the weld pool (9), the graphite particles being mixed with a waxy or liquid carrier means in order to be applied to the filler wire (11), and the mixture being applied in the form of a coating (11.1) to the filler wire (11). The method according to the invention and the corresponding device are distinguished by a high productivity and a relatively low energy consumption. The method can be implemented with a relatively low equipment outlay.