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!

*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.


Using AWS D1.1. to weld A105 weldneck flanges to A106 reducer

Using AWS D1.1. to weld A105 weldneck flanges to A106 reducer

We would like to weld a reducer to a weldneck flange with a full penetration weld in a V groove. The reducer is A106 which is included in the AWS D1.1 table of pre-qualified base metals but the weldneck flange is A105 and is NOT in the table of pre-qualified base metals. When I go through all of the pre-qualified base metals, it seems that non of them are pipe fittings (like a standard ANSI bolt pattern weldneck flange). It all seems to be plate, sheet, pipe, or tubing.

What am I missing? How do you weld standard weldneck flanges to pipe using AWS D1.1?

RE: Using AWS D1.1. to weld A105 weldneck flanges to A106 reducer

AWS D1.1 is for welded structural connections. Pipe fittings are not normally used for structural connections.

However, with D1.1, the Engineer, working on behalf of the Owner, can modify code provisions to accommodate specific conditions. This sound like one of those circumstances where the Engineer could include A105 forged flanges if it is suitable for the application.

Best regards - Al

RE: Using AWS D1.1. to weld A105 weldneck flanges to A106 reducer

Why are you using D1.1, and not the ASME 31.1 or 31.3 or API pipe spec's?

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