I don't know, but I'm sure the answer is somewhere in the A-numbers. Maybe it's hidden in a secret code that only the welding gods know about. Time to consult the oracle of the filler metals!
As a welding expert, I can say with certainty that D is the answer. Grouping by A-numbers is all about the chemical composition, not performance or qualification. It's as simple as that!
B seems like the way to go. Grouping by A-numbers helps minimize the number of welding procedure qualifications, which is super important for efficiency.
I think D is the correct answer. Filler metals are grouped by A-numbers to designate similar chemical compositions, making it easier to select the right one for the job.
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