| 摘要 |
This patent application relates to a method for laser welding one or more workpieces (1, 2) of press-hardenable steel, in particular manganese-boron steel, with a butt joint, in which the workpiece (1) or the workpieces (1, 2) has/have a thickness of at least 1.8 mm and/or a change in thickness (d) of at least 0.4 mm is produced at the butt joint (3), and in which the laser welding takes place while feeding filler wire (10) into the molten bath (8) produced by the laser beam (6). In order to ensure that the weld seam can reliably harden into a martensitic structure during the hot forming (press hardening), this application provides that the filler wire (10) contains at least one alloying element from the group comprising manganese, chromium, molybdenum, silicon and/or nickel, which promotes the formation of austenite in the molten bath (8) produced by the laser beam (6), wherein this at least one alloying element is present in the filler wire (10) with a mass fraction that is at least 0.1% by weight greater than in the press-hardenable steel of the workpiece or the workpieces (1, 2). |
