×
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

AWS D1.1 6GR Welding Repair Rates

AWS D1.1 6GR Welding Repair Rates

AWS D1.1 6GR Welding Repair Rates

(OP)
I am currently on a project where a large portion of the structural welds are under the 6GR position.  AWS in their commentary clearly note that this type of weld needs to be done by specialized welders due to the difficultly of the weld joint configuration.

With that said, we are currently experiencing 5%+ repair rates per linear length and over 40% repair rate per joint calculation.  

A root cause analysis etc. is being performed to determine the cause, with initially consensus is that the primary concern is in the parameters specified in the procedure.  

Anyway I was just wanted to get any feedback from others on typical repair rates noted on their projects specific to 6GR welding.

Thanks in advance.

RE: AWS D1.1 6GR Welding Repair Rates

When you say 6GR welds are you meaning T,K,Y joints ?
If so are they pipe to pipe, pipe to plate or plate to plate ?
Regards,
Kiwi

RE: AWS D1.1 6GR Welding Repair Rates

What process are you using?  To some degree,  you've already answered your own question.  6GR welds are made with limited access, and require additional welder skill to properly manipulate the electrode.  

Electrode angle with FCAW and SMAW processes is the prime candidate for 6GR rejects, as it introduces slag inclusions and porosity from loss of shielding, while IP and porosity are more common with GTAW in my experience.

RE: AWS D1.1 6GR Welding Repair Rates

(OP)
Sorry for the delayed response... am in Asia and Eng-tips is basically blocked 90% of the time??? Getting in via a proxy server.

@Kiwi2671 - T,K,Y joints - yes.  25% CJP pipe-to-pipe, 75% everything-else-to-box (the "everything-else" is another story).

@Mr168 - Process is primarily SMAW, with limited GTAW/SMAW and SMAW/FCAW mixed in.  The bulk of defects is equally spread between lack of fusion and slag, with porosity being limited.

My experience in 6GR welds is limited and while 5%+ would of seemed high to me compared to other positions, I cannot find a good baseline to compare, only that AWS notes that it is a difficult weld.

I am doing my literature reviews in the mean time and the only thing I have found which is reasonably applicable is in NORSOK where they indicate 5-10% repair rate range for structural welding...  

RE: AWS D1.1 6GR Welding Repair Rates

On my recent jobs here in the States, a 5% reject rate would be a blessing more than it would be considered excessively high, especially for a 6GR.

RE: AWS D1.1 6GR Welding Repair Rates

Concur that 5% is EXCELLENT!  Sufficiently so that I would perform a QA audit of the NDT contractor.  My erperience of Ironworkers in the 6GR is that 10-15% is a nominal reject rate.

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