Forming and drawing characteristics of tailor welded sheets in a circular drawbead

초록

Circular drawbead forming and the drawing characteristics of CO<inf>2</inf> laser welded SPC1 blanks are investigated by experiment and numerical analysis. During the drawbead forming process, the distributions of major strains on the upper and lower skins of the specimens are measured. During the drawing process, the drawing forces and the strain distributions are investigated. For numerical analysis, DYNA-3D and SGTAS, a developed rigid-plastic finite-element computer program are used. Numerical results predicted deformation characteristics well in comparison that are in good agreement with the results of experiments. It is concluded that the strains and restraining forces during the forming and the drawing processes show different patterns according to the combination of welded blanks.