TEMPERATURE STRAIN HISTORY MEASUREMENT DURING AN ARC WELDING PROCESS

摘要

Evaluation of weld temperature field history, strain field history, and residual stress distribution are essential in predicting the performance of weldment during service. During an arc welding process electromagnetic field, radiation, and high temperature gradient away from the centerline of weldment affects measurement of temperature and strain history. The important and critical issues regarding temperature history measurement using thermocouples and strain history measurement using strain gages during the Gas Metal Arc Welding (GMAW) process are explored and overviewed. Guidance is provided to properly select sensors and to reduce the measurement errors in such severe environments during GMAW. Results of experimental temperature and strain history during GMAW are presented.