Arcelormittal

Thierry Lizon

Maria Poirier

Cristian Alvarez

A method for producing a welded blank () includes providing two precoated sheets (), butt welding the precoated sheets () using a filler wire. The precoating () entirely covers at least one face () of each sheet () at the time of butt welding. The filler wire () has a carbon content between 0.01 wt. % and 0.45 wt. %. The composition of the filler wire () and the proportion of filler wire () added to the weld pool is chosen such that the weld joint () has (a) a quenching factor FT: FT−0.9FT≥0, where FTis a quenching factor of the least hardenable substrate (), and FTand FTare determined: FT=128+1553×C+55×Mn+267×Si+49×Ni+5×Cr−79×Al−2×Ni−1532×C−5×Mn−127×Si−40×C×Ni−4×Ni×Mn, and (b) a carbon content C<0.15 wt. % or, if C≥0.15 wt. %, a softening factor FAsuch that FA>5000, where FA=10291+4384.1×Mo+3676.9Si−522.64×Al−2221.2×Cr−118.11×Ni−1565.1×C−246.67×Mn.

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Bury, France

Thierry Lizon