Abstract
Sheet metal stamping is widely used in the automotive sector, where the thickness of the blanks is critical to reduce the final weight of the manufactured part. Nevertheless, in specific locations, reinforcements are required for achieving the desired properties. In view of this necessity, laser welding is proposed to reinforce blanks prior to the stamping operation, which enables to increase the mechanical resistance of the stamped part in the required areas without penalizing the total weight. HCT780C (also called DP780) is the material employed in the present study and T-joints are analyzed. The welding process is monitored by means of a coaxial camera and a two-colour pyrometer. In parallel, the cross-sections of the welds are analyzed to evaluate any internal defect or lack of fusion and shear tests are performed to ensure the correct functioning of the weld. The combination of both results provides the opportunity for developing a digital certification of the welding process, which will enable the verification of future welds without the need for experimental studies.
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