The present invention relates to a method for the fabrication of semi-finished sheet metal product of the heat-formable tailored. In this method, at least two steel plates different materials and / or thickness, respectively (1,2 ') are joined by butt joint by laser welding, at least one of these steel sheets from the press hardenable steels fabricated, aluminum or aluminum - with metallization of silicon to (1.1,2.1), laser welding, the filler wire into at least one laser beam (4) molten pool which caused only by (6) ( while feeding 8), carried out, the filler wire (8) is not substantially containing aluminum, the alloying element to promote the formation of austenite and containing at least one, the content of the filler in the wire (8) of the alloying elements , from content in the press hardenable steels, at least greater than 0.1% by weight, filler wire (8) , Before being fed into the molten pool (6), it is heated by the heating device. That weld seam can reliably transformed into hot forming (in connection with the example MnB steel and Hicho quality steel) (press quenching) martensite microstructure in (e.g. in MnB-MnB connection) or mixed microstructure to guarantee, and to produce an optimized weld seam shape, according to the present invention, the average width (b) of at least 0 gap (G) defined by the edges of the steel sheet are welded together as will become .15Mm, steel (1,2 ') are welded together. The amount of the material of the gap filler wire (8) to be inserted into (G), the ratio of the volume of filler wire inserted into the gap (G) to the volume of steel material that is melted by the laser beam is at least 20% is an amount such that. The process according to the invention, it is not necessary to remove in advance the coating from the edge of the steel sheet edges to be welded, providing a significant advantage in terms of cost.
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