METHOD FOR PRODUCING A PRESS-HARDENED LASER WELDED STEEL PART AND PRESS-HARDENED LASER WELDED STEEL PART

摘要

A method for manufacturing a part, comprising the steps of providing first and second precoated sheets (1,2), butt welding the first and second precoated sheets (1, 2) to obtain a blank (15) heating the blank (15) to a heat treatment temperature and maintaining the blank (15) at the heat treatment temperature for a time of from 2 to 10 minutes, wherein the heat treatment temperature is at least greater than the complete austenitization temperature of the weld joint (22) 10 ° C below and at least 15 ° C above the minimum temperature (T min ), formula (I), where Ac3 (WJ) is the complete austenitization temperature of the weld joint 22, Equation (II), where TS 1 and Ts 2 are the ultimate tensile strengths of the strongest and weakest substrates after press hardening, C FW is the carbon content of the filler material, β is the ratio of the filler material, and ρ is the weakest and strongest substrates the heating and holding, press forming the blank 15 into a part, and cooling.