레이저 용접 판재가 적용된 자동차 측변 차체 부품의 성형성 연구

Considering the automotive side-frame as an application of tailor welded blanks, the joining part of B-pillar (or center pillar) and roof-rail, or the joining part of B-pillar and side-sill are the issues of its stretch flanging mode. This joining part was simplified to T-shaped section and the forming behavior was discussed. Employing tailored blanks to the T-section, three of the die step locations and two of the blank types were considered, and the results were discussed. Experimental results were compared with the results of the forming simulations using finite element method. Finite element modeling techniques were discussed, and appropriate method for the weld bead modeling was recommended.