×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Fillet weld capacity on thin base material

Fillet weld capacity on thin base material

Fillet weld capacity on thin base material

(OP)
I am designing a welded steel truss made of round tubes (chords are RMT 2.875x0.120 and the webs are RMT 2.0x0.083).  I would normally start with a weld equal to the thinnest base material, but I need the capacity of a 3/16" fillet weld (all around the ends of the webs) to resist the end moments.  I am used to designing with thicker material and therefore have the following questions:

Can I design for (and specify) a 3/16" weld in this scenario?  
I know the web section (RMT 2.0x0.083) by itself can resist the end moment, but would such a large weld somehow affect its capacity?
 
Fatigue is not a concern.  I attached a rendering if that helps clarify the situation.  

I would greatly appreciate any constructive feedback.  

 

RE: Fillet weld capacity on thin base material

No way,not in a single pass.
I don't understand why you need 3/16" fillet for 1/12" thick material. I would try full strength butt welds using backup rings.

 

Timing has a lot to do with the outcome of a rain dance.

RE: Fillet weld capacity on thin base material

you could use a smaller tube fastened to top & bottom chords and then the middle braces put on.

similar to double/triple butted tubing used in bicycle frames.

single wall as shown, yes, possible, but in at least 2 passes, maybe 3

RE: Fillet weld capacity on thin base material

You are stuck with multiple passes.
Designed for looks and then asked to carry a load.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

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!


Resources