Development of an algorithm for quality inspection of welded structures

A selection of reliable measurement systems that are able to measure the toe radius along the weld bead in a T-joint has been studied. The results show that the currently used methods and gauges do not provide the required accuracy when measuring the toe radius. The gauges are handled differently by different operators – even when using a vision system – which makes the current evaluation methods subjective and unreliable.  Therefore, an algorithm has been developed that assesses weld bead surface data and automatically identifies and calculates the toe radius and the toe angle along the weld. The results obtained by the algorithm are consistent with reference measurements and it is possible for the algorithm to be used in improving the process and quality control during welding.