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F-Number and A-Number

F-Number and A-Number

(OP)
If "P" stands for pressure in P-No. then "S" for structural in S-No., I would like to know what what does F and A means?
As per QW-442 A.No is for the Classification of Ferrous Weld Metal Analysis for Procedure Qualification and QW-432 F-Number is for Grouping of Electrodes and welding rods for Qualification.

Why is "F" and "A" were used for F-Number and A-Number respectively?
Does "F" means filler and "A" means analysis?

Thank you very much.

RE: F-Number and A-Number


P does not stand for pressure. It's just a designator for grouping of materials from a weldability standpoint.
F designates welding filler metal with the number after further defining characteristics
A number defines chemical analysis limits for specific alloy steels.

RE: F-Number and A-Number

ASME is no longer using the S symbol for API materials.

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