×
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

interpass temp

interpass temp

interpass temp

(OP)
If austenetic stainless develops carbide precip at 450C and up, why does my weld data sheet require my interpass temp to be 300F.
This is 304L sch 80 pipe. Gtaw 308L root, Smaw 308L fill and cap.
Thanks
Sftyvlv

RE: interpass temp

sftyvlv;
To avoid excessive heat input in the weld region. This interpass temperature is typical, and has been proven by expierence to reduce susceptibility to carbide precipitation in 3xx stainless steels during welding.

RE: interpass temp

To avoid carbide precipitation at the grain boundaries  (even in low carbon stainless), rapid cooling below 800F is required. Low interpass temperatures are effective means of obtaining that fast cooling rate. The thicker the material the more rapid the cooling given the same low interpass temp.

 

RE: interpass temp

(OP)
Thanks, for the info. I'm new at metalurgy and I've hardly scratched the surface on the wide variety of topics that relate to this field.
I'm a red seal pipewelder in Ontario,working at a coal fired power station,and am curious to the "hows" and "whys" of welding metallurgy.
I have ASME section IX,II (all of),B31.1 and 31.3 to referance albeit a few years old.
I find this sight most informative and helpfull.
Thanks
Sftyvlv

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