Patent ID: 9623515
Date: 2017-04-18
CPC Classifications: B23K,C22C

Claim:
1. A method for laser welding of one or more workpieces made from press hardenable steel in a butt joint, in which the workpiece or the workpieces have a thickness of at least 1.8 mm and/or a jump in thickness of at least 0.4 mm arises at the butt joint, comprising supplying filler wire into a molten bath generated exclusively by a laser beam, wherein the filler wire contains at least one alloy element from the group consisting of manganese, chromium, molybdenum, silicon and nickel, the element promoting the formation of austenite in the molten bath generated using the laser beam, wherein the at least one alloy element is present in the filler wire with a mass proportion that is larger by 0.1% by weight than a mass proportion of the element in the press hardenable steel of the workpiece or the workpieces, wherein the filler wire has a carbon mass proportion that is lower by at least 0.1% by weight than the mass proportion of carbon in the press hardenable steel of the workpiece or the workpieces, and wherein the workpiece used or the workpieces used are uncoated or, by removing in the edge region along the abutting edges to be welded to one another before the laser welding, are partly de-layered.