Method for producing a welded blank (1) comprising: - providing two precoated sheets (2), - butt welding the precoated sheets (2) using a filler wire, the precoating (5) entirely covering at least one face (4) of each sheet (2) at the time of butt welding, - said filler wire (20) having a carbon content between 0.01 wt.% and 0.45 wt.%, - the composition of the filler wire (20) and the proportion of filler wire (20) added to the weld pool is chosen such that the weld joint (22) has : (a) a quenching factor FTWJ : where: - FTBM : quenching factor of the least hardenable substrate (3), and - FTWJ and FTBM are determined: FT=128 + 1553xC + 55xMn + 267xSi + 49xNi + 5xCr - 79xAl - 2xNi² - 1532xC² - 5xMn² - 127xSi² - 40xCxNi - 4xNixMn, and (b) a carbon content CWJ 5000, where FA=10291 + 4384.1xMo + 3676.9Si - 522.64xAl - 2221.2xCr - 118.11xNi- 1565.1xC - 246.67xMn.