METHOD FOR MANUFACTURING COLD-ROLLED, WELDED STEEL SHEETS, AND SHEETS THUS PRODUCED

The invention relates to a method for manufacturing a cold-rolled steel sheet with a thickness ef of 0.5 to 3 mm, comprising the consecutive steps of: providing at least two hot-rolled sheets with a thickness e,, and then welding said at least two hot-rolled sheets end-to-end, so as to create a welded joint (S1) in a direction perpendicular to the hot-rolling direction; then stripping by continuously passing said at least two hot-rolled sheets through a bath; then cold-rolling, in a step (L1), the assembly of the at least two hot-rolled and welded sheets, to an intermediate thickness eint, the cold-rolling direction (DL1) matching said hot-rolling direction, said cold-rolling being carried out with a reduction rate e1=Ln(e i /e int) so that: 0.35 = Ln(ei/eint)/Ln(ei/ef) = 0.65, and then removing said welded joint (S1) so as to obtain at least two sheets cold-rolled in an intermediate manner, and then welding end-to-end the two sheets cold-rolled in an intermediate manner, so as to create a welded joint (S2) with a direction perpendicular to the hot-rolling direction, and then cold-rolling, in a step (L2), the assembly of the at least two sheets cold-rolled in an intermediate manner and welded, down to the final thickness ef, the direction (DL2) of the cold-rolling step (L2) matching the rolling direction (DL1).