A welder is qualified to welding carbon steel, then that welder may be weld onto stainless steel ?
In my opinion, we focus to essential denote such change, deletion, addition, …
ASME IX 2019 - Table QW-353 - SMAW process - QW-404.15 - change F-Number., other essentials are unchanged.
- Welder qualified on carbon steel using electrode F4 (eg. E7016) can not cover for stainless steel electrode F5 (E316) and vice versa.
ASME IX 2019 - Table QW-356 - GTAW process - QW-408.8 Deleted backing gas, other essentials are unchanged.
- Welder qualified on carbon steel using electrode F6 (ER70S-6) may cover for stainless steel ER316 by additional backing gas.