Contact US

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.

Students Click Here

Butt Weld Angle

Butt Weld Angle

Butt Weld Angle


I would need some help regarding butt weld specifications.

Could it be Butt weld regardless the angle of the pipe end. I mean, if no specification further than BW are indicated, could the pipe or accessory be supplied either with 37.5º or 0.5º?
I can't find the specifications in the ASME

Thanks and regards

RE: Butt Weld Angle

You may butt weld two pies with the plain end, i.e. 0-deg. But, the the joint quality factor (Ej) of the pipe will be reduced per B31 Code, which may not be aceptable by the engineering design.

RE: Butt Weld Angle

Ej is for long seams/helical seams, it does not apply to circ welds (pipe to pipe).

RE: Butt Weld Angle

That's because there isn't one.

The bevel angle is noted in the weld spec. If you try to weld square end pipe when the WPS calls for 37 degrees bevel then you are not following the WPS and your weld will probably fail the NDT.

The supplier doesn't know what you want the pipe for.

So the angle is part of your pipe specification/ data sheet.

BTW "...the ASME" is meaningless without at least the particular code number.

This question is all a bit silly as no one will weld pipe end like this

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Butt Weld Angle

for a butt weld the usual angle is 37.5º


RE: Butt Weld Angle

That's an included angle of 75°, which looks like a lot to me. Dependig on material and welding process, it can be OK, but I would not use this as a "general" rule-of-thumb.

RE: Butt Weld Angle


of course it depends on the thikness but the usual is whate I said

RE: Butt Weld Angle

This is from ASM B 31.3.

Most bevels you see machined into pipe is probably 37.5 degrees with a small flat root as it is easy to cut or bevel.

But you do need to specify it on the pipe data sheet.

As the diagram says - these are "typical" - but they are a general ROT for the petrochem industry at least.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Butt Weld Angle

The pipe manufacturer must provide finished ends per the applicable pipe spec. Usually beveled for smaller thin pipe and square cut for larger/thicker pipes.

Same goes for BW fittings....ASME B16.9 has dimensions for bevels.

RE: Butt Weld Angle

Quote (0707)


of course it depends on the thikness but the usual is whate I said

Should have mentioned location or region also as a contributing factor, apart from material and welding process...
The range 60° - 70° is what is used outside the USA, seldom any more.

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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