| abstract |
The invention relates to a method for laser welding one or more workpieces made of press-hardening steel, in particular manganese-boron steel, in a butt joint, wherein the workpiece or the workpieces (1, 2) have a thickness between 0.5 and 1.8 mm and/or a thickness jump (d) between 0.2 and 0.4 mm arises at the butt joint (3) and wherein, during the laser welding, filler wire (10) is fed into the molten pool (8) produced by means of at least one laser beam (6), wherein the molten pool (8) is produced exclusively by the at least one laser beam (6). According to the invention, in order to ensure that the weld can be reliably hardened into a martensitic microstructure during the hot forming (press hardening), the filler wire (10) contains at least one alloying element from the group comprising manganese, chromium, molybdenum, silicon, and/or nickel, which alloying element promotes the formation of austenite in the molten pool (8) produced by means of the laser beam (6), wherein said at least one alloying element is present in the filler wire (10) at a mass fraction that is greater than the mass fraction of the at least one alloying element in the press-hardening steel of the workpiece or the workpieces (1, 2) by at least 0.1 wt%, and wherein the workpiece used or the workpieces (1, 2; 1, 2') used are non-coated or the coating thereof is partially removed. |