Inline Process Monitoring of Hairpin Welding Using Optical and Acoustic Quality Metrics

XARION´s Optical Microphone was used to capture airborne ultrasound generated during the hairpin welding process
A multitude of welds were performed under varying quality-affecting parameter conditions, such as positioning misalignments or focal height and laser power deviations
It was found that the real-time ultrasound emission could be utilized as an early indicator for predicting the important quality criterium of final cross-sectional area of connection