Abstract
Keywords
Corrected S-N curve, Spot weldment, Fatigue quality index, Infrared stress measurement
Abstract
The spot welding process was completed in a very short time and there were many factors affecting the generation of welding defects. It was difficult to control experimental factors. Additionally, it was hard to monitor the distribution of stress in practical cases. The purpose of this study was to investigate the applicability of infrared thermography for the evaluation of spot weldability in view of fatigue life. In this study, infrared (IR) stress analysis adopting an infrared thermography for nondestructive evaluation of spot weldability was investigated. Using temperature and IR stress distribution obtained by an infrared camera from adiabatic heat expansion under a repeated load of sinusoidal waves, we estimated the fatigue quality index ( FQI) of spot welded specimens. We also evaluated and corrected the S-N curve from the original fatigue life curve of base metals.