Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


F-Number and A-Number

F-Number and A-Number

F-Number and A-Number

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close