Home/Technical Glossary/Weld Checker Weld Checker A Weld Checker or weld monitor measures voltage and/or current during the resistance welding or laser welding process. Its basic function is to provide data to be used in statistical determinations and to monitor the ongoing process and alert the user to unacceptable variations in a voltage or current-based parameter. To learn more, visit Weld Monitoring and read our Introduction to SPC and Weld Checkers and Monitors