CS material, E70S2- Welder qualified , can he weld SS 316 material & Duplex, Super duplex material with E70s2 qualification ? or he should be qualified by separate SS 316 & Duplex ,SDSS material ?
Weldcote Metals ER70S-2 1/16" X 36" Tig Welding Rod 1 Lb. - Mig Welding Equipment - Amazon.com