×
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

Weld Repair in HAZ

Weld Repair in HAZ

Weld Repair in HAZ

(OP)
I have a set of 10" WNRF 600# flanges on an superheated steam line (765 deg F service temp) that need to be replaced   The existing pipe is A335 Gr. P1 Sch 40 (P No. 3, 1/2Mo, no Chrome).  The flanges are A182 F11 (P No. 4, 1-1/4Cr, 1/2Mo).  There was no PWHT on the original welds nor do we plan to perform any on the repair.  250 deg F preheat will be maintained during the replacement as it was on the original welds. A GTAW/SMAW procedure with ER80S-B2/E8018-B2 filler will be used.

Is it advisable to avoid the HAZ of the original welds?  Any studies you can site one way or the other would be helpful.

RE: Weld Repair in HAZ

What do you think?

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

RE: Weld Repair in HAZ

As the HAZ of non-PWHT'd welds tends to have the worst of both items:  large grain-size due to the heat input, and no chemistry enrichment like the weld [weld filler is 'richer' than base metal], it would be best to cut out the existing HAZ's during your repair.

Second-best choice it to make sure your HAZ does not intersect with the old HAZ.

RE: Weld Repair in HAZ

That is pretty much it as Duwe says.  It doesn't take a study, just simply knowing what a heat affected zone means to the steel's makeup and resulting properties is enough to answer your question, with no prior PWHT, its the same but so much more so.

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

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