Hi everyone! I'm quite new in the welding world, and so, I have some questions I would like you to evacuate from me.

For instance, it is not clear for me when is applicable 4.11.3 of AWS D1.1 and when exactly I do have to "qualify the proposed combination" as described in 4.11.3

I'm really sorry if my vocabulary is not correct. I hope you could help me.

THANKS!!!

Federico.