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AssigneeArcelorMittal
InventorsFrancis Schmit, Maria Poirier, Sadok Gaied
Estimating the term…
A method for producing a part includes providing a first and a second precoated sheet (1,2), butt welding the first and second precoated sheets (1) to obtain a blank (15), and heating the blank (15) to a heat treatment temperature at least 10° C. lower than the full austenitization temperature of the weld joint (22) and at least 15° C. higher than a minimum temperature Tmin: T min ( ° C . ) = AC 3 ( WJ ) - α IC max 1 0 0 ( Ac 3 ( W J ) - 6 7 3 - 40 × Al ) . where Ac3(WJ) is the full austenitization temperature of the weld joint (22) α IC max = ( 1 - ( 1 + ρ ) ( max ( 1 ; ρ ) T s 2 - 3 5 0 ) ( 1 - β ) ( ρ T s 2 + T s 1 ) + β ( 1 + ρ ) ( 3 1 3 0 C F W + 750 ) - 3 5 0 × ( 1 + ρ ) ) × 100 , where Ts1 and Ts2 are the ultimate tensile strengths of the strongest and the weakest substrate after press-hardening CFW is the carbon content of the filler material β is the proportion of filler material ρ is the ratio between the thicknesses of the weakest and the strongest substrate The method also includes holding the blank (15) at the heat treatment temperature for a time between 2 and 10 minutes; and press-forming the blank (15) into a part and cooling.
A press-hardened laser welded steel part comprising:
Dependencies are inferred from the claim text.