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

CJP groove weld

CJP groove weld

CJP groove weld

Hello complete newbie to any sort of welding here. I'm learning to analyze weld strength on the job and I have a question.

I have a connection detail that calls out CJP welds, but it shows a butt weld on one side and a fillet on the other. This is a beam web welded to a column flange.

My question is if a CJP weld is detailed and the parent material doesn't fail does the weld even need to be checked for strength?

RE: CJP groove weld

I have done a FEA model of the whole assembly and the Von Mises stresses are less than allowables at all locations. Do I still require connection calcs?

RE: CJP groove weld

Not unless there is any impact or fatigue loading.

RE: CJP groove weld

Your thinking is generally right, if the parent metal is strong enough to take the loads, a CJP weld should be o.k. if done right. You might ask if that CJP weld on the beam web to the col. flg. was ever designed in the first place, or if it isn’t overkill showing the laziness of the original designer. Fillets on both sides of the web are usually adequate and save prep. time on the beam web and save welding time and consumables. Given the proper process and procedure, the proper weld joint design, matching (some slight over-matching) weld metal and a good welder and weld, the parent metal will control the design of this joint. So you might say ‘o.k. by inspection.’ But, what you have to watch out for is that all of the above are done well, and the detailing and welding don’t introduce stress raisers which defeat the whole idea of an adequate welded joint. Your detail, if I understand it correctly, assumes a one sided groove weld, with a min. land at its root. Then, it is assumed that the fillet on the other side will boil out any imperfections (crap) at the groove root area, and penetrate into good groove weld metal, to give you a full pen weld. Actually, not too bad a concept when done right. But, enough crap at the groove root, and you don’t boil it all out, you just mix it into a defect in the fillet weld. The other thing is, you’ve said nothing about the CJP (?) at the beam flanges, and how they get a full pen. weld in the whole ‘k’ area of the beam web/flg. That can be a great big stress raiser, brittle spot, hard spot, lack of much elasticity or flexibility (too stiff) to tolerate all the multi-directional welding going on right there. That region often shows cracking and defects before it is ever even loaded.

RE: CJP groove weld

Quote (LeonhardEuler)

I'm learning to analyze weld strength on the job
Not the ideal approach.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: CJP groove weld


Quote (ironic metallurgist)

not the ideal approach

but such is life

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


White Paper - Reshoring Prototyping and Production
In this whitepaper, we'll provide insight into why and when it makes sense for U.S. manufacturers to reshore prototyping and production, and how companies can leverage the benefits of working with local design, prototype, and manufacturing partners during the pandemic and beyond. Download Now
Engineering Report - Top 10 Defect Types in Production
This 22-page report from Instrumental identifies the most common production defect types discovered in 2020, showcases trends from 2019 to 2020, and provides insights on how to prevent potential downtime in 2021. Unlike other methods, Instrumental drives correlations between a variety of data sources to help engineers find and fix root causes. Download Now
White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. 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