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The contribution presents a laser-based method for three-dimensional (3D) measurements of the shape of electrode indentation. The method is based on illumination of the indentation with structured light and detection of the image of the illuminated indentation by means of a digital camera. Image processing algorithms are employed to determine the 3D shape of the indentation. A batch of welds obtained form an automotive production process has been measured and analyzed for characteristic geometrical indentation parameters such as diameter, depth, presence of cracks and splash etc. The potential of indentation shape parameters to serve as indicators of spot quality is discussed.

Indentation shape parameters as indicators of spot weld quality