- - Production Lot Control – test o SMAW – Class S3 or C4 o GMAW & SAW – Class S3 or S4 o FCAW – Class T3 or T4, “-D” designator o SAW – class F2 - Welder Qualification for Restricted Access – AWS D1.8-DC - Heat Input Envelope Testing - Development WPS to meet AWS D1.1 & D1.8 – DC. Contact us for testing and verification the production lot test and welder qualification to AWS D1.8 - DC.