Patent ID: 11919105
Assignee: VOESTALPINE AUTOMOTIVE COMPONENTS LINZ GMBH
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for welding preparation of steel sheets comprising:
providing at least one steel sheet composed of a hardenable steel material with an aluminum silicon anti-corrosion coating, wherein an alloying ablation is performed;
passing a laser beam over aluminum silicon layer on the sheets, the underlying intermetallic interlayer and the underlying base material, in the region of a desired welding edge of the at least one sheet;
vaporizing and aspirating the material of the aluminum silicon layer and the underlying intermetallic interlayer;
producing a reaction with the base material extending into the base material;
producing a metallic reaction ablation layer or alloying ablation layer having iron and alloying elements from the base material and aluminum silicon from the aluminum silicon layer and the intermetallic interlayer; and
wherein, the reaction layer reaching a thickness of 5 μm to 100 μm whereby the aluminum content of the metallic reaction layer after the welding preparation is >2% and does not exceed 11.3% (in % by mass).