Ultrahigh-strength steel laser tailor welded blank and forming process thereof
A technology of laser tailor welding and ultra-high-strength steel, applied in the field of material processing, to achieve the effects of simplifying assembly steps, improving collision resistance, and improving formability
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[0026] Ultra-high-strength steel laser tailor-welded blank forming part B-pillar reinforcement ( figure 1 As shown), Baosteel’s ultra-high-strength boron steel B1500HS with a thickness of 1.5mm is used for the front part with high safety requirements; while the upper and lower ends of the reinforcement that require both formability and energy absorption are used with a thickness of 1.5 mm. 1.0mm Baosteel high-strength steel HC340 ( figure 2 shown), laser welding followed by hot stamping. When a crash occurs, the role of the HC340 steel is to absorb the crash energy, while the role of the boron steel B1500HS is to move the load away from the cockpit, thereby avoiding catastrophic plastic deformation of the cockpit.
[0027] Forming process steps:
[0028] 1) blanking;
[0029] 2) Tailored laser welding;
[0030] 3) Heating to 920-940°C in a walking furnace for at least 5 minutes to fully austenitize;
[0031] 4) Quick transfer to the press;
[0032] 5) Rapid mold clampin...
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