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:Tmin(°C.)=AC3(WJ)-αICmax100(Ac3(WJ)-673-40×Al).whereAc3(WJ) is the full austenitization temperature of the weld joint (22)αICmax=(1-(1+ρ)(max(1;ρ)Ts2-350)(1-β)(ρTs2+Ts1)+β(1+ρ)(3130CFW+750)-350×(1+ρ))×100,whereTs1 and Ts2 are the ultimate tensile strengths of the strongest and the weakest substrate after press-hardeningCFW is the carbon content of the filler materialβ is the proportion of filler materialρ is the ratio between the thicknesses of the weakest and the strongest substrateThe 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.
Method for producing a press-hardened laser welded steel part and press-hardened laser welded steel part
2024-07-11
Patent
Electronic Resource
English
IPC: | B23K Löten , SOLDERING OR UNSOLDERING / B62B Von Hand bewegte Fahrzeuge, z.B. Handkarren oder Kinderwagen , HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / C22C Legierungen , ALLOYS |
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