ArcelorMittal S.A.
METHOD FOR PRODUCING A WELDED STEEL BLANK AND ASSOCIATED WELDED STEEL BLANK

Abstract:

A method for producing a welded steel blank (1) includes providing two precoated sheets (2), each comprising a steel substrate (3) having a precoating (5) on each of its two main faces (4), each sheet (2) comprising, on each main face (4), at a weld edge (14), a removal zone (18) in which the precoating (5) is removed over a removal fraction; and butt welding the sheets (2) using a filler wire (20) so as to create a weld joint (22) having an aluminum content Al.sub.WJ comprised between 0.1 wt. % and 1.2 wt. %. The composition of the wire (20) and the proportion of wire (20) added is such that the weld joint (22) has: (a) a quenching factor FT.sub.WJ such that FT.sub.WJ-0.96FT.sub.BM.gtoreq.0, (b) a nickel content Ni.sub.WJ.ltoreq.14-3.4.times.Al.sub.WJ and a chromium content Cr.sub.WJ.ltoreq.5-2.times.Al.sub.WJ, where Al.sub.WJ is the aluminum content of the weld joint (22).