METHOD FOR LASER WELDING ONE OR MORE WORKPIECES OF HARDENABLE STEEL WITH A BUTT JOINT USING A FILLER WIRE

摘要

The present invention relates to a method for laser welding one or more welded materials (1, 2) of press-curable steel, in particular manganese-boron steel, to be welded (1) or to be welded (1, 2) ) Have a thickness difference (d) of at least 1.8 mm in thickness and / or at least 0.4 mm in the butt joint 3, and laser welding into the filler wire 8 into the molten bath 8 produced by the laser beam 6 10). In order to ensure that the weld seam is reliably cured with martensitic tissue during hot forming (press hardening), the method according to the invention comprises at least one filler group comprising manganese, chromium, molybdenum, silicon and / or nickel. Containing alloying elements, which promote the formation of austenite in the molten bath 8 produced by the laser beam, wherein at least one alloying element is a welded material or a welded material (1, 2) ) Is present in the filler wire at a mass ratio of at least 0.1% higher by weight than contained in the press curable steel.