Analysis and Research on Mismatch in Tailored Blank Laser Welding

Mismatch is an important quality evaluation standard in Tailor welded blanks. The control of mismatch, especially for thinner blanks, is a difficult technique in tailored blank laser welding process. In this paper, the production and control of mismatch is studied based on a tailored blank laser welding system. The origins of the mismatch are obtained after numbers of experiments: the deformation of the blanks before welding, the intensity of the clamping force, the uniformity of the clamping force, the deformation of the clamping beam, the flatness error of the based platform and the welding process. A mathematical model is established according to the analysis of the origins producing mismatch. Experimental results indicate that the model provides an effective theory in increasing welding quality.