Welding tailored blanks is one of the most important applications of laser welding in the automotive industry. An automated industrial-suited weld inspection system should enable a 100% control of the laser weld.
By analyzing the profile, the weld structure and pores in a single compact sensor the fully automated online inspection system controls to 100% the weld at laser welding. Especially important are thereby the three-dimensional absolute geometry of the weld profile and the homogeneity of the weld surface.
At image pre-processing the position and edge of the weld must be recognized accurately and fast. The blank part or workpiece material must be differed from the weld area and the data traffic be reduced. To achieve this, information such as brightness, contrast as well as specific geometry and size information are analyzed using special algorithms.
To determine all errors laser triangulation (3D) and grey image analysis (2D) are combined and three parallel procedures are used: 3D profile analysis, 2D weld structure analysis (weld texture analysis) and 2D pore analysis. Due to fewer downtimes the reaction times were reduced, increasing process security.
Laser Welding of Tailored Blanks
Laser triangulation (3D) and grey image analysis (2D) along with three parallel procedures: 3D profile analysis, 2D weld structure analysis (weld texture analysis) and 2D pore analysis.