Method of laser welding one or more workpieces made of hardenable steel at a butt joint

摘要

The present invention relates to a method of laser welding one or more workpieces made of press-hardening steel, in particular manganese boron steel, at a butt joint, wherein the workpiece or workpieces (1, 2) is , Having a thickness between 0.5 mm and 1.8 mm and / or producing a step (d) with a thickness between 0.2 mm and 0.4 mm in the butt joint (3), This is done by feeding a filler wire (10) into the molten bath (8) generated by at least one laser beam (6), the molten bath (8) being generated only by at least one laser beam (6). The According to the invention, the filler wire is made of manganese, chromium, molybdenum, silicon and / or nickel in order to ensure that the weld can be hardened and formed into a martensite structure during thermoforming (press hardening). At least one alloying element from the group comprising: the alloying element promotes the formation of austenite in the molten bath (8) produced by the laser beam (6), the at least one alloying element comprising a filler Workpiece or workpieces present and used in wire (10) in a mass percentage that is at least 0.1% by weight greater than in the press-hardening steel of the workpiece or workpieces (1, 2) (1,2; 1,2 ') are uncoated or their coating is partially removed. [Selection] Figure 1